ALLMERICA INVESTMENT TRUST
485APOS, 2000-02-28
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<PAGE>


   As filed with the Securities and Exchange Commission on February 28, 2000
                        File Nos. 811-4138 and 2-94067

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                                   FORM N-1A

         REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [ ]
                  Pre-Effective Amendment No. ____       [_]

                  Post-Effective Amendment No. 39        [X]
                                    and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940  [_]

                  Amendment No. 40                       [X]


                          ALLMERICA INVESTMENT TRUST
                          --------------------------
                             (Name of Registrant)

                              440 Lincoln Street
                        WORCESTER, MASSACHUSETTS 01653
                   (Address of Principal Executive Offices)

              Registrant's Telephone Number, including Area Code:
                                (508) 855-1000

                 (Names and Addresses of Agents for Service:)

                George M. Boyd, Esq.             Gregory D. Sheehan, Esq.
                Allmerica Financial              Ropes & Gray
                440 Lincoln Street               One International Place
                Worcester, MA  01653             Boston, Massachusetts  02110


Approximate Date of Proposed Public Offering: as soon after filing as
- ---------------------------------------------------------------------

practicable
- -----------

It is proposed that this filing will become effective:

____ immediately upon filing pursuant to paragraph (b)

____ on (date) pursuant to paragraph (b)

____ 60 days after filing pursuant to paragraph (a)(1)

  X  on May 1, 2000 pursuant to paragraph (a)(1)
- ----

____ 75 days after filing pursuant to paragraph (a)(2)

____ on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:


____ This post-effective amendment designates a new effective date for a
previously filed post-effective amendment.
<PAGE>

Allmerica Investment Trust
- --------------------------                                           Prospectus

                                                                     May 1, 2000

This Prospectus describes the following investment Funds of the Trust which
serve as the underlying investments for insurance related accounts.

                          Select Emerging Markets Fund
                          Select Aggressive Growth Fund
                        Select Capital Appreciation Fund
                          Select Value Opportunity Fund
                        Select International Equity Fund
                               Select Growth Fund
                          Select Strategic Growth Fund
                          Select Growth and Income Fund


                       Select Investment Grade Income Fund
                                Money Market Fund

This Prospectus explains what you should know about each of the Funds. Please
read it carefully before you invest.

A particular Fund may not be available under the variable annuity or variable
life insurance policy which you have chosen. The Prospectus of the specific
insurance product you have chosen will indicate which Funds are available and
should be read in conjunction with this Prospectus. Inclusion in this Prospectus
of a Fund which is not available under your policy is not to be considered a
solicitation.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined that
this Prospectus is adequate or complete. Any representation to the contrary is a
criminal offense.

                                                           Allmerica
                                                           Investment
                                                             Trust

                                                      440 Lincoln Street
                                               Worcester, Massachusetts 01653
                                                         1-800-828-0540
<PAGE>

                               Table of Contents
                               -----------------

FUND SUMMARIES.............................................................   3

        Objectives, Strategies and Risks...................................   4

              Select Emerging Markets Fund.................................   4

              Select Aggressive Growth Fund................................   5

              Select Capital Appreciation Fund.............................   6

              Select Value Opportunity Fund................................   7

              Select International Equity Fund.............................   8

              Select Growth Fund...........................................   9

              Select Strategic Growth Fund.................................  10

              Select Growth and Income Fund................................  11

              Select Investment Grade Income Fund..........................  12

              Money Market Fund............................................  13

EXPENSE SUMMARY............................................................  14

DESCRIPTION OF PRINCIPAL INVESTMENT RISKS..................................  16

OTHER INVESTMENT STRATEGIES................................................  18

MANAGEMENT OF THE FUNDS....................................................  20

PRICING OF FUND SHARES.....................................................  28

PURCHASE AND REDEMPTION OF SHARES..........................................  28

DISTRIBUTIONS AND TAXES....................................................  29



FINANCIAL HIGHLIGHTS.......................................................  30

APPENDIX...................................................................  34


                                     LEGEND
                                     ------

Performance                         [GRAPHIC APPEARS HERE]

Investment Objectives               [GRAPHIC APPEARS HERE]

Financial Information               [GRAPHIC APPEARS HERE]

Management of Fund                  [GRAPHIC APPEARS HERE]

Risk                                [GRAPHIC APPEARS HERE]

Investment Strategies               [GRAPHIC APPEARS HERE]



- -----------------------------
Allmerica Investment Trust
                                                                               2
<PAGE>

                                 Fund Summaries
                                 --------------

Allmerica Investment Trust provides a broad range of investment options through
10 separate investment portfolios, or Funds. Shares of the Funds are sold
exclusively to variable annuity and variable life insurance Separate Accounts
and qualified pension and retirement plans.

The investment manager of the Trust is Allmerica Financial Investment Management
Services, Inc. The Manager is responsible for managing the Trust's daily
business and has general responsibility for the management of the investments of
the Funds. The Manager, at its expense, has contracted with investment
Sub-Advisers to manage the investments of the Funds. Each Sub-Adviser has been
selected on the basis of various factors including management experience,
investment techniques and staffing. See "Management of the Funds" for more
information about the Manager and the Sub-Advisers.

The following summaries describe each Fund's investment objective and principal
investment strategies, identify the principal investment risks of investing in
the Fund and provide performance charts for the Fund. Note that any percentage
limitations listed under a Fund's principal investment strategies apply at the
time of investment. The principal risks are discussed in more detail under
"Description of Principal Investment Risks". The bar charts show how the
investment returns of the shares of a Fund have varied in the past ten years (or
for the life of the Fund if less than 10 years). The table following each bar
chart shows how the Fund's average annual return for the last one, five and ten
years (or for the life of the Fund, if shorter) compares to those of a
broad-based securities market index. Past performance does not necessarily
indicate how the Fund will perform in the future. The bar charts and tables give
some indication of the risks of investing in each Fund by showing changes in the
Fund's performance. The bar charts and tables do not reflect expenses associated
with the variable insurance product that you are purchasing. If those expenses
had been reflected, the performance shown would have been lower.


- ----------------------------
Allmerica Investment Trust
                                                                               3
<PAGE>

Objectives, Strategies and Risks


                          Select Emerging Markets Fund
                          ----------------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: Schroder Investment Management North
                          America Inc.

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks long-term growth
                          of capital by investing in the world's emerging
                          markets.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: While its investments
                          are not limited to any specific region of the world,
                          the Fund normally invests at least 65% of its assets
                          in companies located or primarily operating in
                          countries with emerging markets. The Fund usually has
                          investments in at least five developing countries.
                          Before the Fund invests in a country, the Sub-Adviser
                          considers various factors such as that country's
                          political stability and economic prospects. In
                          selecting securities for the Fund, the Sub-Adviser
                          focuses on the long-term growth potential of the
                          securities.

                          The Fund invests primarily in equities, including
                          common stock, preferred stock, securities convertible
                          into common stock, rights and warrants and similar
                          securities. The Fund also may invest up to 35% of its
                          assets in debt securities of issuers in emerging
                          markets, equity and debt securities of issuers in
                          developed countries, cash and cash equivalents. The
                          Fund may invest in lower rated bonds, commonly known
                          as "junk bonds", as further discussed in the
                          "Description of Principal Investment Risks."

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Credit Risk

                          . Currency Risk

                          . Derivatives Risk

                          . Emerging Markets Risk

                          . Foreign Investment Risk

                          . Investment Management Risk

                          . Liquidity Risk

                          . Market Risk

 See "Description of Principal Investment Risks."

 The bar chart and table below do not reflect expenses at the insurance product
 level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                                     65.72%
                                     ------
                                      1999

During 1998 and the period shown above the highest quarterly return was 29.52%
for the quarter ended 12/31/99 and the lowest was (21.23)% for the quarter ended
9/30/98.


Performance Table

Average Annual Total Returns
(for the periods ending                       Past           Since Inception
December 31, 1999)                          One Year       (February 20, 1998)
- ------------------                          --------       -------------------

  Fund Shares                                 65.72%             15.22%
  -----------                                -------             ------

  MSCI Emerging Markets Free Index*           66.41%             11.50%
  ---------------------------------          -------             ------

* The MSCI Emerging Markets Free Index is an unmanaged index of 26 emerging
markets.

                                                    ----------------------------
                                                      Allmerica Investment Trust
4
<PAGE>

Objectives, Strategies and Risks


                          Select Aggressive Growth Fund
                          -----------------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: Nicholas-Applegate Capital Management,
                          L.P.

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks above-average
                          capital appreciation by investing primarily in common
                          stocks of companies which are believed to have
                          significant potential for capital appreciation.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: To pursue this goal,
                          the Fund looks predominantly for stocks of small and
                          mid-size companies that show potential for rapid
                          growth. The Fund typically invests in companies that,
                          because of positive developments affecting the
                          company, offer the possibility of accelerating
                          earnings. The Sub-Adviser uses systematic, fundamental
                          research in selecting investments for the Fund.

                          Under normal circumstances, the Fund invests at least
                          65% of its assets in common stocks, securities
                          convertible into common stocks and warrants. The Fund
                          also may invest in debt securities and preferred
                          stocks and up to 25% of its assets in foreign
                          securities (not including its investments in American
                          Depositary Receipts or "ADRs").

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Derivatives Risk

                          . Investment Management Risk

                          . Liquidity Risk

                          . Market Risk

 See "Description of Principal Investment Risks."

 The bar chart and table below do not reflect expenses at the insurance product
 level, and if they did, the performance shown would have been lower.

           Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

19.51%        -2.31%      32.28%       18.55%     18.71%       10.56%    38.66%
- ------        ------      ------       ------     ------       ------    ------
1993          1994        1995         1996       1997         1998      1999


During the period shown above the highest quarterly return was 25.64% for the
quarter ended 12/31/99 and the lowest was (22.81)% for the quarter ended
9/30/98.

Performance Table

Average Annual Total Returns
(for the periods ending                Past        Past        Since Inception
December 31, 1999)                   One Year    Five Years   (August 21, 1992)
- ------------------                   --------    ----------   -----------------

  Fund Shares                         38.66%       23.32%            20.71%
  -----------                         ------       ------            ------

  Russell 2500 Index*                 24.15%       19.43%            17.37%
  -------------------                 ------       ------            ------

* The Russell 2500 Index is an unmanaged composite of 2,500 small-to-mid
capitalization stocks.

- ----------------------------
Allmerica Investment Trust
                                                                               5
<PAGE>

Objectives, Strategies and Risks


                        Select Capital Appreciation Fund
                        --------------------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: T. Rowe Price Associates, Inc.

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks long-term growth
                          of capital. Realization of income is not a significant
                          investment consideration and any income realized on
                          the Fund's investments will be incidental to its
                          primary objective.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: The Fund's
                          Sub-Adviser looks for companies with proven business
                          ideas and earnings growth rates in excess of market
                          averages. The Fund normally invests at least 50% of
                          its equity assets in securities of companies with
                          market capitalizations that fall within the range of
                          companies in the S&P Mid Cap 400 Index (as of December
                          31, 1999, $185 million to $37 billion market
                          capitalization). The Fund may also invest in larger
                          firms and firms with a market capitalization below
                          $185 million.

                          While the Fund invests primarily in common stocks, it
                          also may invest in preferred stocks, warrants,
                          government securities, corporate bonds and other debt
                          securities. Up to 25% of its assets may be invested in
                          "junk bonds". The Fund may invest without limitation
                          in foreign securities.

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Credit Risk

                          . Currency Risk

                          . Derivatives Risk

                          . Foreign Investment Risk

                          . Investment Management Risk

                          . Liquidity Risk

                          . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

         8.80%              14.28%             13.88%          25.36%
         -----              ------             ------          ------
         1996               1997               1998            1999

During the period shown above the highest quarterly return was 27.90% for the
quarter ended 12/31/98 and the lowest was (18.54)% for the quarter ended
9/30/98.

T. Rowe Price Associates, Inc. became Sub-Adviser of the Fund on April 1, 1998.
Performance before that date is based on the performance of the Fund's previous
Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending                     Past               Since Inception
December 31, 1999)                        One Year             (April 28, 1995)
- ------------------                        --------             ----------------

  Fund Shares                              25.36%                    21.42%
  -----------                              ------                    ------

  Russell 2500 Index*                      24.15%                    18.67%
  -------------------                      ------                    ------

* The Russell 2500 Index is a unmanaged composite of 2,500 small-to-mid
capitalization stocks.

                                                    ----------------------------
                                                      Allmerica Investment Trust
6
<PAGE>

Objectives, Strategies and Risks


                          Select Value Opportunity Fund
                          -----------------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: Cramer Rosenthal McGlynn, LLC

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks long-term growth
                          of capital by investing primarily in a diversified
                          portfolio of common stocks of small and mid-size
                          companies, whose securities at the time of purchase
                          are considered by the Sub-Adviser to be undervalued.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: The Fund's
                          Sub-Adviser attempts to find stocks that are
                          attractively valued relative to their future prospects
                          and the market as a whole. The most promising
                          opportunities can be found in companies that are
                          temporarily out of favor or when most analysts are
                          confused about changes taking place at a company. In
                          these situations, the company's stock is often
                          undervalued.

                          The Fund invests primarily in companies with market
                          capitalization between $200 million and $5 billion.
                          The Fund normally invests at least 80% of the
                          portfolio in common stocks and may invest in other
                          equity securities and up to 25% of its assets in
                          foreign securities (not including its investments in
                          ADRs).

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Currency Risk

                          . Derivatives Risk

                          . Foreign Investment Risk

                          . Investment Management Risk

                          . Liquidity Risk

                          . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

    -6.51%      17.60%      28.53%      24.85%        4.87%        -4.70%
    ------      ------      ------      ------        -----        ------
    1994        1995        1996        1997          1998         1999


During the period shown above the highest quarterly return was 15.52% for the
quarter ended 3/31/99 and the lowest was (16.86)% for the quarter ended
6/30/99.


Cramer Rosenthal McGlynn, LLC became Sub-Adviser of the Fund on January 1, 1997.
Performance before that date is based on the performance of the Fund's previous
Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending           Past            Past         Since Inception
December 31, 1999)              One Year        Five Years     (April 30, 1993)
- ------------------              --------        ----------     ----------------

  Fund Shares                    -4.70%           13.52%            11.57%
  -----------                    ------           ------            ------

  Russell 2500 Index*            24.15%           19.43%            16.41%
  -------------------            ------           ------            ------

* The Russell 2500 Index is an unmanaged composite of 2,500 small-to-mid
capitalization stocks.

- ----------------------------
Allmerica Investment Trust
                                                                               7
<PAGE>

Objectives, Strategies and Risks


                          Select International Equity Fund
                          --------------------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: Bank of Ireland Asset Management (U.S.)
                          Limited

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks maximum long-term
                          total return (capital appreciation and income)
                          primarily by investing in common stocks of established
                          non-U.S. companies.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: Under normal market
                          conditions, at least 65% of the Fund's assets will be
                          invested in the securities of medium and large-size
                          companies located in at least five foreign countries,
                          not including the United States. To achieve its
                          objective, the Fund focuses on equity securities which
                          the Sub-Adviser believes are undervalued in relation
                          to the company's prospects for future earnings growth.
                          The Fund may also buy fixed-income debt securities,
                          primarily for defensive purposes.

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Currency Risk

                          . Derivatives Risk

                          . Foreign Investment Risk

                          . Investment Management Risk

                          . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

           19.63%       21.94%       4.65%      16.48%        31.71%
           ------       ------       -----      ------        ------
           1995         1996         1997       1998          1999


During the period shown above the highest quarterly return was 20.89% for the
quarter ended 12/31/99 and the lowest was (17.69)% for the quarter ended
09/30/98.

Performance Table

Average Annual Total Returns
(for the periods ending             Past           Past        Since Inception
December 31, 1999)                  One Year       Five Years    (May 2, 1994)
- ------------------                  --------       ----------    -------------

  Fund Shares                       31.71%         18.54%        15.47%
  -----------                       ------         ------        ------

  Morgan Stanley Capital Intl.
  EAFE Index*                       27.31%         13.15%        11.54%
  -----------                       ------         ------        ------

* The Morgan Stanley Capital International EAFE (Europe, Australia, Far East)
Index, reflecting reinvestment of gross dividends, is an unmanaged
capitalization weighted index of foreign developed country common stocks.

                                                   -----------------------------
                                                     Allmerica Investment Trust
8
<PAGE>

Objectives, Strategies and Risks


                               Select Growth Fund
                               ------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: Putnam Investment Management, Inc.

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks to achieve long-
                          term growth of capital by investing in a diversified
                          portfolio consisting primarily of common stocks
                          selected on the basis of their long-term growth
                          potential.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: To attain its
                          objective, the Fund looks for companies that appear to
                          have favorable long-term growth characteristics. The
                          Fund typically invests in stocks of large
                          capitalization companies, such as those included in
                          the S&P 500 Index, although it can also make
                          investments in smaller growth companies.

                          At least 65% of the Fund's assets normally will
                          consist of common stocks that the Sub-Adviser believes
                          have growth potential. The Fund also may purchase
                          convertible bonds and preferred stocks and warrants.
                          The Fund normally invests substantially all of its
                          investments in equity securities, although it may
                          invest up to 35% in debt securities including up to
                          15% in "junk bonds". The Fund may invest up to 25% of
                          its assets in foreign securities (not including its
                          investments in ADRs).

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Credit Risk

                          . Derivatives Risk

                          . Investment Management Risk

                          . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


    0.84%      -1.49%     24.59%     22.02%     34.06%     35.44%     29.80%
    -----      ------     ------     ------     ------     ------     ------
    1993       1994       1995       1996       1997       1998       1999


During the period shown above the highest quarterly return was 25.02% for the
quarter ended 12/31/98 and the lowest was (11.84)% for the quarter ended
09/30/98.

Putnam Investment Management, Inc. became Sub-Adviser of the Fund on July 1,
1996. Performance before that date is based on the performance of the Fund's
previous Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending             Past          Past          Since Inception
December 31, 1999)               One Year     Five Years      (August 21, 1992)
- ------------------               --------     ----------      -----------------

  Fund Shares                     29.80%         29.06%            20.57%
  -----------                     ------         ------            ------

  S&P 500 Index*                  21.03%         28.55%            21.46%
  --------------                  ------         ------            ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


- --------------------------
Allmerica Investment Trust                                            9
<PAGE>

Objectives, Strategies and Risks

                          Select Strategic Growth Fund
                        --------------------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: TCW Investment Management Company

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks long-term capital
                          appreciation.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: To pursue its
                          investment objective, the Fund invests (except when
                          maintaining a temporary defensive position) at least
                          65% of the value of its total assets in equity
                          securities issued by companies with market
                          capitalization, at the time of acquisition, within the
                          capitalization range of the companies comprising the
                          Standard & Poor's Small Cap 600 Index.

                          In managing the Fund's investments, the Sub-Adviser
                          pursues a small cap growth investment philosophy. The
                          Sub-Adviser uses fundamental company-by-company
                          analysis in conjunction with technical and
                          quantitative market analysis to screen potential
                          investments and to continuously monitor securities in
                          the Fund's portfolio.

                          The Fund focuses on small, fast-growing companies that
                          offer cutting-edge products, services or technologies.
                          Because these companies are often in their early
                          stages of development, their stocks tend to fluctuate
                          more than most other securities. The Fund may invest
                          up to 25% of its assets in foreign securities (not
                          including its investments in ADRs).

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Currency Risk

                          . Derivatives Risk

                          . Foreign Investment Risk

                          . Investment Management Risk

                          . Liquidity Risk

                          . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


                                     16.06%
                                     ------
                                      1999


During 1998 and the period shown above the highest quarterly return was 16.94%
for the quarter ended 12/31/98 and the lowest was (16.77)% for the quarter ended
9/30/98.

TCW Investment Management Company became Sub-Adviser of the Fund on April 1,
2000. Performance before that date is based on the performance of the Fund's
previous Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending               Past                   Since Inception
December 31, 1999)                 One Year                (February 20, 1998)
- ------------------                 --------                -------------------

  Fund Shares                       16.06%                      6.89%
  -----------                       ------                      -----

  S&P 500 Index*                    21.03%                     21.80%
  --------------                    ------                     ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


                                                      --------------------------
10                                                    Allmerica Investment Trust
<PAGE>

Objectives, Strategies and Risks


                          Select Growth and Income Fund
                          -----------------------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: J.P. Morgan Investment Management Inc.

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks a combination of
                          long-term growth of capital and current income. The
                          Fund will invest primarily in dividend-paying common
                          stocks and securities convertible into common stocks.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: The Fund invests in a
                          broadly diversified portfolio of equity securities,
                          primarily the common stock of companies included in
                          the S&P 500 Index. The Fund's industry diversification
                          and other risk characteristics will be similar to
                          those of the index. The Fund may invest in a wide
                          range of equity securities, consisting of common
                          stocks, preferred stocks, securities convertible into
                          common and preferred stocks and warrants. The Fund may
                          purchase individual stocks not presently paying
                          dividends if the Sub-Adviser believes the overall
                          portfolio is positioned to achieve its income
                          objective.

                          The Fund may invest up to 35% of its assets in
                          fixed-income securities, including up to 15% in "junk
                          bonds". However, the Fund's normal strategy is to be
                          nearly fully invested in equity securities. The Fund
                          may also invest up to 25% of its assets in foreign
                          securities (not including its investments in ADRs).

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Derivatives Risk

                          . Investment Management Risk

                          . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns[GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


   10.37%      0.73%     30.32%     21.26%    22.51%     16.43%       18.43%
   ------      -----     ------     ------    ------     ------       ------
   1993        1994      1995       1996      1997       1998         1999


During the period shown above the highest quarterly return was 19.41% for the
quarter ended 12/31/98 and the lowest was (12.66)% for the quarter ended
9/30/98.

J.P. Morgan Investment Management Inc. became Sub-Adviser of the Fund on
April 1, 1999. Performance before that date is based on the performance of the
Fund's previous Sub-Advisers.

Performance Table

Average Annual Total Returns
(for the periods ending             Past           Past      Since Inception
December 31, 1999)               One Year     Five Years     (August 21, 1992)
- ------------------               --------     ----------     -----------------

  Fund Shares                      18.43%         21.69%         15.92%
  -----------                      ------         ------         ------

  S&P 500 Index*                   21.03%         28.55%         21.46%
  --------------                   ------         ------         ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


- --------------------------
Allmerica Investment Trust                                                    11
<PAGE>


Objectives, Strategies and Risks


                       Select Investment Grade Income Fund
                       -----------------------------------
                   (formerly the Investment Grade Income Fund)

[GRAPHIC APPEARS HERE]    Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks as high a level
                          of total return, which includes capital appreciation
                          as well as income, as is consistent with prudent
                          investment management.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: To achieve its goal,
                          the Fund invests in investment grade debt securities
                          and money market instruments such as bonds and other
                          corporate debt obligations; obligations issued or
                          guaranteed by the U.S. Government, its agencies or
                          instrumentalities, or money market instruments,
                          including commercial paper, bankers acceptances and
                          negotiable certificates of deposit. The Fund also may
                          invest in mortgage-backed and asset-backed securities.
                          The Fund may invest up to 25% of its assets in foreign
                          securities (not including its investments in ADRs) and
                          up to 25% of its assets in debt obligations of
                          supranational entities.

                          Investment grade securities are rated in the four
                          highest grades by Moody's Investors Services or
                          Standard & Poor's Rating Services or unrated but
                          determined by the Sub-Adviser to be of comparable
                          quality. For more information about rating categories,
                          see the Appendix to the Statement of Additional
                          Information ("SAI"). The Fund may invest in securities
                          with relatively long maturities as well as securities
                          with shorter maturities.

                          The Sub-Adviser actively manages the portfolio with a
                          view to producing a high level of total return for the
                          Fund while avoiding undue risks to capital. The
                          Sub-Adviser attempts to anticipate events leading to
                          price or ratings changes through using in-depth
                          fundamental credit research.

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Company Risk

                          . Interest Rate Risk

                          . Investment Management Risk

                          . Liquidity Risk

                          . Market Risk

                          . Prepayment Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


                        1990       ....................  8.02%
                        1991       .................... 16.75%
                        1992       ....................  8.33%
                        1993       .................... 10.80%
                        1994       .................... -2.96%
                        1995       .................... 17.84%
                        1996       ....................  3.56%
                        1997       ....................  9.45%
                        1998       ....................  7.97%
                        1999       .................... -0.97%

During the period shown above the highest quarterly return was 6.02% for the
quarter ended 6/30/95 and the lowest was (2.61)% for the quarter ended 3/31/94.

Performance Table
Average Annual Total Returns
(for the periods ending                Past         Past             Past
December 31, 1999)                     One Year     Five Years       Ten Years
- ------------------                     --------     ----------       ---------

Fund Shares                            -0.97%          7.38%            7.69%
- -----------                            ------          -----            -----

Lehman Brothers
Aggregate Bond Index*                  -0.83%          7.73%            7.69%
- ---------------------                  ------          -----            -----

* The Lehman Brothers Aggregate Bond Index(R) is an unmanaged index of fixed
rate debt issues with an investment grade or higher rating at least one year to
maturity and an outstanding par value of at least $25 million.


                                                  -----------------------------
12                                                Allmerica Investment Trust
<PAGE>

Objectives, Strategies and Risks


                                Money Market Fund
                                -----------------

[GRAPHIC APPEARS HERE]    Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]    Investment Objective: The Fund seeks to obtain maximum
                          current income consistent with preservation of capital
                          and liquidity.

[GRAPHIC APPEARS HERE]    Principal Investment Strategies: The Fund seeks to
                          achieve its objective by investing in high quality
                          money market instruments such as obligations issued or
                          guaranteed by the United States Government, its
                          agencies, or instrumentalities; commercial paper;
                          obligations of banks or savings and loan associations
                          including bankers acceptances and certificates of
                          deposit; repurchase agreements and cash and cash
                          equivalents. The Fund may invest up to 25% of its
                          assets in U.S. dollar denominated foreign debt
                          securities and short-term instruments (not including
                          investments in ADR's).

                          Any security purchased for the Fund must receive the
                          highest or second highest quality rating by at least
                          two recognized rating agencies or by one if only one
                          has rated the security. If the security is unrated the
                          security must be seen by the Sub-Adviser as having
                          comparable quality. Portfolio securities will have a
                          remaining maturity of 397 days or less and the
                          portfolio is managed to maintain a dollar-weighted
                          maturity of 90 days or less.

                          The Fund attempts to maintain a constant net asset
                          value of $1.00 per share but it may not be able to do
                          so due to adverse market conditions or other factors
                          and it is possible for investors to lose money by
                          investing in the Fund. An investment in the Fund is
                          not a bank deposit and is not insured or guaranteed by
                          the Federal Deposit Insurance Corporation or any other
                          government agency.

[GRAPHIC APPEARS HERE]    Principal Risks:

                          . Credit Risk

                          . Interest Rate Risk

                          . Investment Management Risk

                          . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns[GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]



  8.17%  6.22%   3.78%    3.00%   3.93%    5.84%   5.36%   5.47%   5.51%   5.19%
  -----  -----   -----    -----   -----    -----   -----   -----   -----   -----
  1990   1991    1992     1993    1994     1995    1996    1997    1998    1999



During the period shown above the highest quarterly return was 2.01% for the
quarter ended 06/30/90 and the lowest was 0.73% for the quarter ended 6/30/93.


Performance Table

Average Annual Total Returns
(for the periods ending           Past             Past                Past
December 31, 1999)             One Year       Five Years          Ten Years
- ------------------             --------       ----------          ---------

  Fund Shares                     5.19%           5.47%               5.23%
  -----------                     -----           -----               -----

  IBC/Donoghue First Tier
  Money Market Index*             4.57%           4.97%               4.79%
  -------------------             -----           -----               -----

* IBC/Donoghue is an independent firm that tracks regulated money market funds
on a yield, shareholder, assets size and portfolio allocation basis.

The Fund's 7-day yield ending December 31, 1999 was 5.57%.


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Allmerica Investment Trust                                           13
<PAGE>

                                 Expense Summary
                                 ---------------

Expenses are one of several factors to consider when investing in a Fund.
Expenses shown are based on expenses incurred in respect of shares of the Funds
for the 1999 fiscal year. The Examples show the cumulative expenses attributable
to a hypothetical $10,000 investment in each Fund over specified periods.

Fees and Expenses of the Funds
This table describes the fees and expenses that you may pay if you invest in the
Funds. Please note that the expenses listed below do not include the expenses of
the applicable variable insurance product that you are purchasing. You should
refer to the variable insurance product prospectus for more information relating
to the fees and expenses of that product, which are in addition to the expenses
of the Funds.

<TABLE>
<CAPTION>
                                                                      Annual Fund Operating Expenses
                                                Shareholder        (expenses deducted from Fund assets)      Total Annual
                                                   Fees                                                         Fund
                                           (fees paid directly    Management    Distribution     Other        Operating
                                           from your investment)     Fees       (12b-1) Fees    Expenses       Expenses
                                           ---------------------     ----       ------------    --------       --------
<S>                                       <C>                      <C>          <C>             <C>          <C>
  Select Emerging Markets Fund                     None              1.35%           None         0.57%       1.92%(1),(2)
  Select Aggressive Growth Fund                    None              0.81%*          None         0.06%       0.87%(1),(2)*
  Select Capital Appreciation Fund                 None              0.90%*          None         0.07%       0.97%(1),(2)*
  Select Value Opportunity Fund                    None              0.90%(1)        None         0.07%       0.97%(1),(2)
  Select International Equity Fund                 None              0.89%           None         0.13%       1.02%(1),(2)
  Select Growth Fund                               None              0.78%           None         0.05%       0.83%(1),(2)
  Select Strategic Growth Fund                     None              0.85%           None         0.35%       1.20%(1),(2)
  Select Growth and Income Fund                    None              0.67%           None         0.07%       0.74%(1),(2)
  Select Investment Grade Income Fund              None              0.43%           None         0.07%       0.50%(1)
  Money Market Fund                                None              0.24%           None         0.05%       0.29%(1)
</TABLE>



*    Effective September 1, 1999, the management fee rates for the Select
     Aggressive Growth Fund and Select Capital Appreciation Fund were revised.
     The Management Fee and Total Annual Fund Operating Expense ratios shown in
     the table above have been adjusted to assume that the revised rates took
     effect on January 1, 1999.

(1)  Through December 31, 2000, Allmerica Financial Investment Management
     Services, Inc. (the "Manager") has declared a voluntary expense limitation
     of 1.35% of average net assets for the Select Aggressive Growth Fund and
     Select Capital Appreciation Fund, 1.25% for the Select Value Opportunity
     Fund, 1.50% for the Select International Equity Fund, 1.20% for the Select
     Growth Fund and Select Strategic Growth Fund, 1.10% for the Select Growth
     and Income Fund, 1.00% for the Select Investment Grade Income Fund, and
     0.60% for the Money Market Fund. The total operating expenses of these
     Funds of the Trust were less than their respective expense limitations
     throughout 1999 except the Select Strategic Growth Fund received a
     reimbursement of $813.00 in 1999 under its expense limitation.

                                                     ---------------------------
14                                                   Allmerica Investment Trust
<PAGE>


     In addition through December 31, 2000, the Manager has agreed to
     voluntarily waive its management fee to the extent that expenses of the
     Select Emerging Markets Fund exceed 2.00% of the Fund's average daily net
     assets. The amount of such waiver shall not exceed the net amount of
     management fees earned by the Manager from the Fund after subtracting fees
     paid by the Manager to the Fund's Sub-Adviser.

     Through December 31, 2000, the Select Value Opportunity Fund's management
     fee rate has been voluntarily limited to an annual rate of 0.90% of average
     daily net assets.

     The declaration of a voluntary management fee or expense limitation in any
     year does not bind the Manager to declare future expense limitations with
     respect to these Funds. These limitations may be terminated at any time.

(2)  These Funds have entered into agreements with brokers whereby brokers
     rebate a portion of commissions. Had these amounts been treated as
     reductions of expenses, the total annual fund operating expense ratios
     would have been 1.88% for Select Emerging Market Fund, 0.88% for the Select
     Aggressive Growth Fund, 0.98% for the Select Capital Appreciation Fund,
     0.88% for the Select Value Opportunity Fund, 1.01% for the Select
     International Equity Fund, 0.81% for the Select Growth Fund, 1.17% for the
     Select Strategic Growth Fund, and 0.73% for the Select Growth and Income
     Fund.

Example
This Example is intended to help you compare the cost of investing in a Fund
with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in a Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. The
Example also assumes that your investment earns a 5% return each year and that
the Fund's operating expenses remain the same. Although your actual costs may be
higher or lower, based on these assumptions your costs would be:

<TABLE>
<CAPTION>
  Fund                                             1 Year           3 Years          5 Years          10 Years
  ----                                             ------           -------          -------          --------

<S>                                                <C>               <C>             <C>             <C>
  Select Emerging Markets Fund                     $197              $608            $1,046          $2,259
  ----------------------------                     ----              ----            ------          ------

  Select Aggressive Growth Fund                    $93               $291            $506            $1,123
  -----------------------------                    ---               ----            ----            ------

  Select Capital Appreciation Fund                 $100              $314            $544            $1,206
  --------------------------------                 ----              ----            ----            ------

  Select Value Opportunity Fund                    $99               $310            $539            $1,194
  -----------------------------                    ---               ----            ----            ------

  Select International Equity Fund                 $105              $326            $566            $1,253
  --------------------------------                 ----              ----            ----            ------

  Select Growth Fund                               $85               $266            $462            $1,029
  ------------------                               ---               ----            ----            ------

  Select Strategic Growth Fund                     $123              $383            $663            $1,461
  ----------------------------                     ----              ----            ----            ------

  Select Growth and Income Fund                    $76               $237            $413            $921
  -----------------------------                    ---               ----            ----            ----

  Select Investment Grade Income Fund              $51               $161            $280            $629
  -----------------------------------              ---               ----            ----            ----

  Money Market Fund                                $30               $93             $163            $369
  -----------------                                ---               ---             ----            ----
</TABLE>

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Allmerica Investment Trust                                               15
<PAGE>

        [GRAPHIC APPEARS HERE] Description of Principal Investment Risks

The following is a summary of the principal risks of investing in a Fund and the
factors likely to cause the value of your investment in the Fund to decline. The
principal risks applicable to each Fund are identified under "Fund Summaries".
There are also many factors that could cause the value of your investment in a
Fund to decline which are not described here. It is important to remember that
there is no guarantee that the Funds will achieve their investment objective,
and an investor in any of the Funds could lose money.

Company Risk
A Fund's equity and fixed income investments in a company often fluctuate based
on:

 . the firm's actual and anticipated earnings,

 . changes in management, product offerings and overall financial strength and

 . the potential for takeovers and acquisitions.

This is due to the fact that prices of securities react to the fiscal and
business conditions of the company that issued the securities. Factors affecting
a company's particular industry, such as increased production costs, also may
affect the value of its securities.

Smaller companies with market capitalizations of less than $1 billion or so are
more likely than larger companies to have limited products lines or smaller
markets for their goods and services. Small company stocks may not trade very
actively, and their prices may fluctuate more than stocks of other companies as
a result of lower liquidity. They may depend on a small or inexperienced
management group. Stocks of smaller companies also may be more vulnerable to
negative changes than stocks of larger companies.

Credit Risk
Credit risk is the risk that the issuer of a fixed income security will not be
able to pay principal and interest when due. There are different levels of
credit risk. Funds that invest in lower-rated securities have higher levels of
credit risk. Lower-rated or unrated securities of equivalent quality, generally
known as "junk bonds", have very high levels of credit risk. "Junk bonds" are
considered to be speculative in their capacity to pay interest and repay
principal. The price of a fixed income security can be expected to fall if the
issuer defaults on its obligation to pay principal or interest, the rating
agencies downgrade the issuer's credit rating or there is negative news that
affects the market's perception of the issuer's credit risk.

Currency Risk
This is the risk that the value of a Fund's investments may decline due to
fluctuations in exchange rates between the U.S. dollar and foreign currencies.
Funds that invest in securities denominated in or are receiving revenues in
foreign currencies are subject to currency risk. There is often a greater risk
of currency fluctuations and devaluations in emerging markets countries.

Derivatives Risk
A Fund may use derivatives to hedge against an opposite position that the Fund
also holds. While hedging can reduce or eliminate losses, it can also reduce or
eliminate gains. When a Fund uses derivatives to hedge, it takes the risk that
changes in the value of the derivative will not match those of the asset being
hedged. Incomplete correlation can result in unanticipated losses. A Fund may
also use derivatives as an investment vehicle to gain market exposure. Gains or
losses from derivative investments may be substantially greater than the
derivative's original cost. When a Fund uses derivatives, it is also subject to
the risk that the other party to the agreement will not be able to perform.
Additional risks associated with derivatives include mispricing and improper
valuation.

                                                     ---------------------------
16                                                   Allmerica Investment Trust
<PAGE>

Emerging Markets Risk
Investments in emerging markets securities involve all of the risks of
investments in foreign securities, and also have additional risks. The markets
of developing countries have been more volatile than the markets of developed
countries with more mature economies. Many emerging markets companies in the
early stages of development are dependent on a small number of products and lack
substantial capital reserves. In addition, emerging markets often have less
developed legal and financial systems. These markets often have provided
significantly higher or lower rates of return than developed markets and usually
carry higher risks to investors than securities of companies in developed
countries.

Foreign Investment Risk


Investing in foreign securities involves risks relating to political, social and
economic developments abroad, as well as risks resulting from the differences
between the regulations to which U.S. and foreign issuers and markets are
subject. These risks may include the seizure by the government of company
assets, excessive taxation, withholding taxes on dividends and interest,
limitations on the use or transfer of portfolio assets, and political or social
instability. In the event of nationalization, expropriation or other
confiscation, a Fund could lose its entire investment. Funds investing in
foreign securities may experience rapid changes in value. One reason for this
volatility is that the securities markets of many foreign countries are
relatively small, with a limited number of companies representing a small number
of industries. Enforcing legal rights may be difficult, costly and slow in
foreign countries. Also, foreign companies may not be subject to governmental
supervision or accounting standards comparable to those applicable to U.S.
companies, and there may be less public information about their operations.


Interest Rate Risk
When interest rates rise, the prices of fixed income securities in a Fund's
portfolio will generally fall. Conversely, when interest rates fall, the prices
of fixed income securities in the Fund's portfolio will generally rise. Even
Funds that invest in the highest quality debt securities are subject to interest
rate risk. Interest rate risk usually will affect the price of a fixed income
security more if the security has a longer maturity because changes in interest
rates are increasingly difficult to predict over longer periods of time. Fixed
income securities with longer maturities will therefore be more volatile than
other fixed income securities with shorter maturities.

Investment Management Risk
Investment management risk is the risk that a Fund does not achieve its
investment objective, even though the Sub-Adviser uses various investment
strategies and techniques.

Liquidity Risk
This is the risk that a Fund will not be able to sell a security at a reasonable
price because there are too few people who actively buy and sell, or trade, that
security on a regular basis. Liquidity risk increases for Funds investing in
foreign investments (especially emerging markets securities), smaller companies,
lower credit quality bonds (also called "junk bonds"), restricted securities,
over-the-counter securities and derivatives.

Market Risk
This is the risk that the price of a security held by a Fund will fall due to
changing economic, political or market conditions or to factors affecting
investor psychology.

Prepayment Risk
While mortgage-backed securities may have a stated maturity, their expected
maturities may vary when interest rates rise or fall. When interest rates fall,
homeowners are more likely to prepay their mortgage loans which may result in an
unforeseen loss of future interest income to a Fund. Also, because prepayments
increase when interest rates fall, the prices of mortgage-backed securities do
not increase as much as other fixed income securities when interest rates fall.

- ----------------------------
Allmerica Investment Trust                                            17
<PAGE>

               [GRAPHIC APPEARS HERE] Other Investment Strategies
               --------------------------------------------------

The Fund Summaries starting on page 3 describe the investment objective and the
principal investment strategies and risks of each Fund. The Funds may at times
use the following investment strategies. Attached as an Appendix is a chart with
a listing of various investment techniques and strategies that the Sub-Advisers
of the Funds may utilize. A Fund may decide that it is in the best interests of
shareholders to make changes to its investment objective and strategies
described in this Prospectus. These investment objectives and strategies may be
changed with the approval of the Board of Trustees, but without shareholder
approval.

Derivative Investments. (applicable to each Fund except the Money Market Fund)
Instead of investing directly in the types of portfolio securities described in
the Summary, each Fund, except the Money Market Fund, may buy or sell a variety
of "derivative" investments to gain exposure to particular securities or
markets. Derivatives are financial contracts whose value depends on, or is
derived from, the value of an underlying asset, reference rate or index. A
Fund's Sub-Adviser will sometimes use derivatives as part of a strategy designed
to reduce other risks and sometimes will use derivatives to enhance returns,
which increases opportunities for gain but also involves greater risk.

Foreign Investments. (applicable to each Fund) Each Fund may invest all or a
substantial part of its portfolio in securities of companies that are located or
primarily doing business in a foreign country. A company is considered to be
located in a foreign country if it is organized under the laws of, or has a
principal office in, that country. A company is considered as primarily doing
business in a country if (i) the company derives at least 50% of its gross
revenues or profits from either goods or services produced or sold in the
country or (ii) at least 50% of the company's assets are situated in the
country. A Fund may invest in foreign securities either directly or indirectly
through the use of depositary receipts, such as ADRs. Depositary receipts are
generally issued by banks or trust companies and evidence ownership of
underlying foreign securities. An ADR may be sponsored by the issuer of the
underlying foreign security or it may be issued in unsponsored form. The holder
of a sponsored ADR is likely to receive more frequent and extensive financial
disclosure concerning the foreign issuer than the holder of an unsponsored ADR
and generally will bear lower transaction charges. The Select Capital
Appreciation Fund and Select International Equity Fund may also purchase foreign
securities through European Depositary Receipts and Global Depositary Receipts.

High Yield Securities. (applicable to the Select Emerging Markets Fund, Select
Capital Appreciation Fund, Select Growth Fund and Select Growth and Income Fund)
The Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
Growth Fund and Select Growth and Income Fund may purchase corporate debt
securities which are high yield securities, or "junk bonds" (rated at the time
of purchase BB or lower by Moody's or S&P, or equivalently rated by another
rating agency, or unrated but believed by the Sub-Adviser to have similar
quality.) These securities are considered to be speculative in their capacity to
pay interest and repay principal.


                                                   -----------------------------
                                                   Allmerica Investment Trust

18
<PAGE>

Lending of Securities. (applicable to all Funds) To realize additional income,
the Funds may lend portfolio securities to broker-dealer or financial
institutions in an amount up to 33-1/3% of a Fund's total assets. While any such
loan is outstanding, a Fund will continue to receive amounts equal to the
interest or dividends paid by the issuer on the securities, as well as interest
(less any rebates to be paid to the borrower) on the investment of the
collateral or a fee from the borrower. Each Fund will have the right to call
each loan and obtain the securities. Lending portfolio securities involves
possible delays in receiving additional collateral or in the recovery of the
securities or possible loss of rights in the collateral.


Restricted Securities. (applicable to all Funds) The Funds may purchase
securities that are not registered under Federal securities law ("restricted
securities"), but can be offered and sold to certain "qualified institutional
buyers". Each Fund will not invest more than 15% (10% for the Money Market Fund)
of its net assets in restricted securities (and securities deemed to be
illiquid). These limits do not apply if the Board of Trustees determines that
the restricted securities are liquid. The Board of Trustees has adopted
guidelines and delegated to the Manager the daily function of determining and
monitoring the liquidity of restricted securities. The Board, however, retains
sufficient oversight and is ultimately responsible for the determinations. This
investment practice could increase the level of illiquidity in a Fund if buyers
lose interest in restricted securities. As a result, a Fund might not be able to
sell these securities when its Sub-Adviser wants to sell, or might have to sell
them at less than fair value. In addition, market quotations for these
securities are less readily available.

Temporary Defensive Strategies. At times a Sub-Adviser may determine that market
conditions make it desirable temporarily to suspend a Fund's normal investment
activities. This is when the Fund may temporarily invest in a variety of
lower-risk securities, such as U.S. Government and other high quality bonds and
short-term debt obligations. Such strategies attempt to reduce changes in the
value of the Fund's shares. The Fund may not achieve its investment objective
while these strategies are in effect.

Frequent Trading. Certain Funds from time to time may engage in active and
frequent trading to achieve their investment objective. Frequent trading
increases transaction costs, which could detract from the Fund's performance.


- -----------------------------
Allmerica Investment Trust

                                                                              19
<PAGE>

                 [GRAPHIC APPEARS HERE] Management of the Funds
                 ----------------------------------------------

The Trust is governed by a Board of Trustees. Allmerica Financial Investment
Management Services, Inc. is the investment Manager of the Trust responsible for
managing the Trust's day-to-day business affairs. The Manager is located at 440
Lincoln Street, Worcester, MA 01653. The Manager and its predecessor, Allmerica
Investment Management Company, Inc., have been managing mutual funds since 1985.
The Manager currently serves as investment manager to one other mutual fund.
Sub-Advisers have been hired to manage the investments of the Funds. The Trust
and Manager have obtained an order of exemption from the SEC that permits the
Manager to enter into and materially amend sub-advisory agreements with non-
affiliated Sub-Advisers without obtaining shareholder approval. The Manager has
ultimate responsibility to oversee Sub-Advisers. The Manager has the ability,
subject to approval of the Trustees, to hire and terminate Sub-Advisers and to
change materially the terms of the Sub-Adviser Agreements, including the
compensation paid to the Sub-Advisers. The Sub-Advisers have been selected by
the Manager and Trustees with the help of BARRA RogersCasey, Inc., a pension
consulting firm. The fees earned by each Sub-Adviser and BARRA RogersCasey are
paid by the Manager. The performance by the Sub-Advisers is reviewed quarterly
by a committee of the Board of Trustees, with assistance from BARRA RogersCasey.

The following table provides information about each Fund's Sub-Adviser:

<TABLE>
<CAPTION>

           Fund Name,
    Sub-Adviser Name and Address                                              Experience
    ----------------------------                                              ----------
    <S>                                                    <C>
    Select Emerging Markets Fund                           Organized in 1980 and has approximately $47 billion assets
    Schroder Investment Management                         under management as of December 31, 1999.
    North America Inc.                                     Provides global equity and fixed income
    787 Seventh Avenue                                     management services to mutual funds and
    New York, NY 10019                                     other institutional investors.
    ------------------                                     ------------------------------

    Select Aggressive Growth Fund                          Has over $41 billion assets under management as of December
    Nicholas-Applegate Capital Management, L.P.            31, 1999. Founded in 1984. Clients include employee benefit
    600 West Broadway, Suite 2900                          and retirement plans, foundations, investment companies and
    San Diego, CA 92101                                    individuals.
    -------------------                                    ------------

    Select Capital Appreciation Fund                       Manages with its affiliates assets totaling $179.9 billion as
    T. Rowe Price Associates, Inc.                         of December 31, 1999 for eight million individual and
    100 East Pratt Street                                  institutional investor accounts.
    Baltimore, MD 21202                                    Founded in 1937.
    -------------------                                    ----------------

    Select Value Opportunity Fund                          Established in 1973. Over $3.2 billion assets under
    Cramer Rosenthal McGlynn, LLC                          management as of December 31, 1999. Provides investment
    707 Westchester Avenue                                 advice to mutual funds, individuals, government agencies,
    White Plains, NY 10604                                 pension plans and trusts.
    ----------------------                                 -------------------------
</TABLE>

                                                   -----------------------------
                                                   Allmerica Investment Trust

20
<PAGE>

<TABLE>
<CAPTION>

             Fund Name,
      Sub-Adviser Name and Address                                                  Experience
      ----------------------------                                                  ----------
    <S>                                                      <C>
    Select International Equity Fund                         Managed over $50 billion in global securities as of December
    Bank of Ireland Asset Management (U.S.) Ltd.             31,  1999. Founded  in 1966. Provides international investment
    26 Fitzwilliam Place, Dublin 2,                          management services.
    Ireland and  20 Horseneck Lane
    Greenwich, CT 06830
    -------------------

    Select Growth Fund                                       As of December 31, 1999, $391 billion assets under
    Putnam Investment Management, Inc.                       management, including affiliates.Investment manager of
    One Post Office Square                                   mutual funds and other clients since 1937.
    Boston, MA 02109
    ----------------

    Select Strategic Growth Fund                             Had over $70 billion in assets under management or
    TCW Investment Management Company                        committed to management as of December 31, 1999.
    865 South Figueroa Street, Suite 1800                    Established  in  1971. Manages pension and profit sharing
    Los Angeles, CA  90017                                   funds, retirement/health and welfare funds, public employee
    ----------------------                                   retirement funds, and private accounts.

    Select Growth and Income Fund                            Incorporated in 1984. With affiliates, approximately $349 billion
    J.P. Morgan Investment Management Inc.                   assets  under  management  as of December 31, 1999. Serves as
    522 Fifth Avenue                                         investment adviser for employee benefit plans and other
    New York, NY 10036                                       institutional assets, as well as mutual funds and variable
    ------------------                                       annuities.
                                                             ----------

    Select Investment Grade Income Fund                      Incorporated in 1993. Had $13.3 billion assets under management
    Allmerica Asset Management, Inc.                         as of December 31, 1999. Serves as investment adviser to
    440 Lincoln Street                                       investment companies and affiliated insurance company
    Worcester, MA 01653                                      accounts.
    -------------------

    Money Market Fund                                        See Select Investment Grade Income Fund above.
    Allmerica Asset Management, Inc.
    440 Lincoln Street
    Worcester, MA 01653
    -------------------
</TABLE>

For a sample listing of certain of the Sub-Advisers' clients, see "Investment
Management and Other Services" in the SAI.


- -----------------------------
Allmerica Investment Trust

                                                                              21
<PAGE>

The following individuals or groups of individuals are primarily responsible for
the day-to-day management of the Funds' portfolios:

<TABLE>
<CAPTION>

        Fund Name and                      Name and Title of            Service with          Business Experience
      Sub-Adviser Name                   Portfolio Manager(s)            Sub-Adviser          for Past Five Years
      ----------------                   --------------------            -----------          -------------------
<S>                                 <C>                                <C>               <C>
Select Emerging Markets Fund        John A. Troiano, Director,         1981 - Present    Director of Schroder with
Schroder Investment Management      Chief Executive and Chairman                         responsibility for policy for
North America Inc. ("Schroder")     of Emerging Markets Committee                        emerging markets.

                                    Mark Bridgeman,                    1990 - Present    Fund Manager specializing in
                                    First Vice President                                 African markets.

                                    Heather F. Crighton, Director      1993 - Present    Fund Manager specializing in
                                    and Senior Vice President                            Asian emerging markets.
                                                                                         -----------------------

Select Aggressive Growth Fund       Lawrence S. Speidell, Partner      1994 - Present    Director of Global/Systematic
Nicholas-Applegate Capital                                                               Portfolio Management and
Management, L.P. ("NACM")                                                                Research at NACM. Prior
                                                                                         to joining NACM, he spent
                                                                                         ten years with Batterymarch
                                                                                         Financial Management.

                                    John J. Kane, Partner              1994 - Present    Senior Portfolio Manager for
                                                                                         the U.S. Systematic portfolios
                                                                                         at NACM. Prior to joining
                                                                                         NACM in 1994, he was
                                                                                         employed by ARCO Invest-Management
                                                                                         Company and General Electric.

                                    Mark W. Stuckelman,                1995 - Present    Portfolio Manager for the
                                    Portfolio Manager                                    U.S. Systematic portfolios
                                                                                         at NACM. Prior to joining
                                                                                         NACM, he was employed for
                                                                                         five  years  with Wells Fargo
                                                                                         Bank, Fidelity Management
                                                                                         Trust Co., and BARRA, Inc.
                                                                                         --------------------------

Select Capital Appreciation Fund    Brian W.H. Berghuis,               1985 - Present    He has sixteen years
T. Rowe Price Associates, Inc.      Chartered Financial Analyst                          experience in equity research
("T. Rowe Price")                                                                        and portfolio management.
                                                                                         He is chairman of the investment
                                                                                         team for the Fund.

                                    John F. Wakeman, Research          1989 - Present    He spent ten years with
                                    Analyst & Portfolio Manager                          T. Rowe Price as a research
                                                                                         analyst and portfolio manager
                                                                                         and has twelve years' experience in
                                                                                         equity research.
                                                                                         ----------------
</TABLE>

                                                   -----------------------------
                                                   Allmerica Investment Trust

22
<PAGE>

<TABLE>

        Fund Name and                      Name and Title of           Service with          Business Experience
      Sub-Adviser Name                   Portfolio Manager(s)           Sub-Adviser          for Past Five Years
      ----------------                   --------------------           -----------          -------------------
<S>                                 <C>                               <C>               <C>
Select Capital Appreciation Fund    Marc L. Baylin, Chartered         1993 - Present    He has eight years of
continued                           Financial Analyst                                   investment experience in
                                                                                        equity research and has been
                                                                                        with T. Rowe Price for the past
                                                                                        six years as a research analyst
                                                                                        and portfolio manager.
                                                                                        ----------------------

Select Value Opportunity Fund       Ronald H. McGlynn, CEO and        1973 - Present    He joined Cramer Rosenthal
Cramer Rosenthal McGlynn,           President of Cramer Rosenthal                       in 1973, has 29 years of
LLC ("Cramer Rosenthal")                                                                investment experience and
                                                                                        serves as Co-Chief Investment
                                                                                        Officer  and   Portfolio Manager.

                                    Jay B. Abramson, Executive        1985 - Present    He has been with Cramer
                                    Vice President and Director                         Rosenthal since 1985 and his
                                    of Research and Co-Chief                            overall responsibility is for
                                    Investment Officer                                  investment research.
                                    ------------------                                  --------------------

Select International Equity Fund    Christopher Reilly,               1980 - Present    Since 1985, he has had
Bank of Ireland Asset Management    Chief Investment Officer                            overall responsibility for asset
(U.S.) Limited ("BIAM")                                                                 management. He previously
                                                                                        worked in the United
                                                                                        Kingdom in stockbrokering
                                                                                        and investment management.

                                    Michael McCarthy,                 1997 - Present    Mr. McCarthy rejoined BIAM
                                    Portfolio Manager                                   in 1997 from a major life assurance
                                                                                        Company where he was Head of
                                                                                        Asset Management. Prior to this, he
                                                                                        worked  for  BIAM in the U.K. in a
                                                                                        senior portfolio management capacity.

                                    Peter Wood, Senior                1985 - Present    Prior to 1985, he spent five
                                    Portfolio Manager                                   years with another leading
                                                                                        investment management firm.
                                                                                        He is now responsible for
                                                                                        portfolio construction at BIAM.

                                    Jane Neill, Senior Equity Analyst 1994 - Present    Previously, she was Chief
                                                                                        Investment Officer with
                                                                                        another leading Irish investment
                                                                                        management firm.
                                                                                        ----------------

Select Growth Fund                  C. Beth Cotner, CFA,              1995 - Present    Prior to 1995, Ms. Cotner was
Putnam Investment                   Chief Investment Officer                            Executive Vice President at
Management, Inc. ("Putnam")                                                             Kemper Financial Services.

                                    Manuel Weiss, CFA,                1987 - Present    He has been an investment
                                    Senior Vice President                               professional with Putnam
                                                                                        since 1987.
</TABLE>

- -----------------------------
Allmerica Investment Trust

                                                                              23
<PAGE>

<TABLE>
<CAPTION>

        Fund Name and                      Name and Title of          Service with          Business Experience
      Sub-Adviser Name                   Portfolio Manager(s)           Sub-Adviser         for Past Five Years
      ----------------                   --------------------           -----------         -------------------
<S>                                 <C>                               <C>                <C>
Select Strategic Growth Fund        Christopher J. Ainley, Managing    1994 - Present    Prior to joining TCW, Mr. Ainley
TCW Investment Management           Director                                             spent 2 years at Putnam Investments
Company ("TCW")                                                                          as a Vice President and Analyst in
                                                                                         the Equity Research Group and then as
                                                                                         a Portfolio Manager for the Core Equity
                                                                                         Group. Previously  he served with J.P.
                                                                                         Morgan Investment Management and Coopers
                                                                                         and Lybrand.

                                    Douglas S. Foreman,                1994 - Present    Prior to 1994, Mr. Foreman
                                    Group Managing Director &                            was employed by Putnam
                                    Chief Investment Officer -                           Investment in Boston. He spent
                                    U.S. Equities                                        his last 5 years at Putnam managing
                                                                                         Institutional accounts and mutual
                                                                                         Funds. Mr. Foreman is a Chartered
                                                                                         Financial Analyst.

                                    Charles Larsen                    1984 - Present     Prior to TCW, Mr. Larsen
                                    Managing Director                                    was a Senior Vice President and
                                                                                         Portfolio Manager for CIGNA
                                                                                         Investment Management Company.
                                                                                         He is a Chartered Financial Analyst and
                                                                                         Chartered Investment Counselor.
                                                                                         -------------------------------

Select Growth and Income Fund       Bernard A. Kroll, Vice President  1996 - Present     Prior to joining J.P. Morgan
J.P. Morgan Investment                                                                   in 1996, Mr. Kroll was an
Management Inc. ("J.P. Morgan")                                                          equity derivatives specialist
                                                                                         at Goldman Sachs & Co.,
                                                                                         founded his own software
                                                                                         development firm and options
                                                                                         broker-dealer, and managed
                                                                                         several derivatives businesses
                                                                                         at Kidder, Peabody & Co.
                                                                                         He is a portfolio manager in
                                                                                         the Structured Equity Group.

                                    Timothy J. Devlin, Vice President 1996 - Present     Prior to joining J.P. Morgan
                                                                                         in 1996, Mr. Devlin was an
                                                                                         equity portfolio manager at
                                                                                         Mitchell Hutchins Asset
                                                                                         Management Inc. He is a
                                                                                         portfolio manager in the
                                                                                         Structured Equity Group.

                                    James C. Wiess, Vice President    1992 - Present     He is a portfolio manager in
                                                                                         the Structured Equity Group
                                                                                         and has been at J.P. Morgan
                                                                                         since 1992.
                                                                                         -----------
</TABLE>
                                                   -----------------------------
                                                   Allmerica Investment Trust

24
<PAGE>

<TABLE>
<CAPTION>

       Fund Name and                              Name and Title of           Service with         Business Experience
     Sub-Adviser Name                            Portfolio Manager(s)          Sub-Adviser          for Past Five Years
     ----------------                            --------------------          -----------          -------------------
<S>                                              <C>                          <C>                <C>
Select Investment Grade Income Fund              Ann K. Tripp,                 1987 - Present    She was a Portfolio Manager
Allmerica Asset Management, Inc. ("AAM")         Vice President                                  for AAM prior to becoming a
                                                                                                 Vice President.
                                                                                                 ---------------

Money Market Fund                             John C. Donohue, Vice President   1995 - Present   He was a portfolio manager
Allmerica Asset Management, Inc.                                                                 at CS First Boston Investment
("AAM")                                                                                          Management prior to joining
                                                                                                 AAM.
                                                                                                 ----
</TABLE>

- -----------------------------
Allmerica Investment Trust

                                                                              25
<PAGE>


For the fiscal year ended December 31, 1999, the Funds paid the Manager the fees
shown in the table below:


                                                Fee (as a percentage of
Fund                                               average net assets)
- ----                                               -------------------

    Select Emerging Markets Fund                            1.35%
    ----------------------------                            -----

    Select Aggressive Growth Fund                           0.85%
    -----------------------------                           -----

    Select Capital Appreciation Fund                        0.91%
    --------------------------------                        -----

    Select Value Opportunity Fund                           0.90%
    -----------------------------                           -----

    Select International Equity Fund                        0.89%
    --------------------------------                        -----

    Select Growth Fund                                      0.78%
    ------------------                                      -----

    Select Strategic Growth Fund                            0.85%
    ----------------------------                            -----

    Select Growth and Income Fund                           0.67%
    -----------------------------                           -----

    Investment Grade Income Fund (renamed the
    Select Investment Grade Income Fund)                    0.43%
    -----------------------------------                     -----

    Money Market Fund                                       0.24%
    -----------------                                       -----



For the fiscal year ended December 31, 1999, the Manager paid each Sub-Adviser
aggregate fees as set forth below:

<TABLE>
<CAPTION>
                                                                                                Fee (as a percentage of
   Sub-Adviser                                                                                  average net assets)
   -----------                                                                                  -------------------
   <S>                                                                                          <C>
   Schroder Investment Management North America Inc. (Select Emerging Markets Fund)                      1.00%
   --------------------------------------------------------------------------------                      -----

   Nicholas-Applegate Capital Management, L.P. (Select Aggressive Growth Fund)                           0.48%
   ---------------------------------------------------------------------------                           -----

   T. Rowe Price Associates, Inc. (Select Capital Appreciation Fund)                                     0.46%
   -----------------------------------------------------------------                                     -----

   Cramer Rosenthal McGlynn, LLC (Select Value Opportunity Fund)                                         0.52%
   -------------------------------------------------------------                                         -----

   Bank of Ireland Asset Management (U.S.) Limited (Select International Equity Fund)                    0.30%
   ----------------------------------------------------------------------------------                    -----

   Putnam Investment Management, Inc. (Select Growth Fund)                                               0.27%
   -------------------------------------------------------                                               -----

   Cambiar Investors, Inc. * (Select Strategic Growth Fund)                                              0.50%
   --------------------------------------------------------                                              -----

   J.P. Morgan Investment Management Inc. ** (Select Growth and Income Fund)                             0.26%
   -------------------------------------------------------------------------                             -----

                                    (Investment Grade Income Fund-renamed the
   Allmerica Asset Management, Inc.  Select Investment Grade Income Fund)                                0.20%
   ----------------------------------------------------------------------                                -----

   Allmerica Asset Management, Inc. (Money Market Fund)                                                  0.09%
   ----------------------------------------------------                                                  -----
</TABLE>

                                                   -----------------------------
                                                   Allmerica Investment Trust

26
<PAGE>



*    TCW replaced Cambiar Investors, Inc. ("Cambiar") Sub-Adviser of the Select
     Strategic Growth Fund on April 1, 2000. Cambiar served as Sub-Adviser of
     the Select Strategic Growth Fund from February 20, 1998 to March 31, 2000.
     Cambiar received a fee computed daily at an annual rate based on the
     average net assets of the Select Growth and Income Fund, based on the
     following schedule:

    Assets                                                    Rate
    ------                                                    ----

    First $50 Million                                         0.50%
    -----------------                                         -----

    Next $100 Million                                         0.45%
    -----------------                                         -----

    Next $100 Million                                         0.35%
    -----------------                                         -----

    Next $100 Million                                         0.30%
    -----------------                                         -----

    Over $350 Million                                         0.25%
    -----------------                                         -----


TCW receives a fee computed daily at an annual rate of 0.85% based on the
average daily net assets of the Select Strategic Growth Fund. When the average
daily net assets of the Fund exceed $100 million, the fee shall be computed
daily and paid quarterly at an annual rate of 0.75% of the total average daily
net assets of the Fund.

**   J.P. Morgan Investment Management Inc. ("J.P. Morgan") replaced John A.
     Levin & Co., Inc. ("Levin") as Sub-Adviser of the Select Growth and Income
     Fund on April 1, 1999. Levin served as Sub-Adviser of the Select Growth and
     Income Fund from September 1, 1994 to March 31, 1999. Levin received a fee
     computed daily at an annual rate based on the average daily net assets of
     the Select Growth and Income Fund, based on the following schedule:

    Assets                                                    Rate
    ------                                                    ----

    First $100 Million                                        0.40%
    ------------------                                        -----

    Next $200 Million                                         0.25%
    -----------------                                         -----

    Over $300 Million                                         0.30%
    -----------------                                         -----

     J.P. Morgan receives a fee computed daily at an annual rate based on the
     average daily net assets of the Select Growth and Income Fund, based on the
     following schedule:

    Assets                                                    Rate
    ------                                                    ----

    First $500 Million                                        0.30%
    ------------------                                        -----

    Next $500 Million                                         0.25%
    -----------------                                         -----

    Over $1 Billion                                           0.20%
    ---------------                                           -----


- -----------------------------
Allmerica Investment Trust

                                                                              27
<PAGE>

                             Pricing of Fund Shares
                             ----------------------

The Funds sell and redeem their shares at a price equal to their net asset value
("NAV") without paying any sales or redemption charges. The NAV of a share is
computed by adding the current value of all the Fund's assets, subtracting its
liabilities and dividing by the number of its outstanding shares. NAV is
computed once daily at the close of regular trading on the New York Stock
Exchange each day the Exchange is open - normally 4:00 p.m. Eastern Time. Orders
for the purchase or redemption of shares are filled at the next NAV computed
after an order is received by the Fund. The Funds do not accept orders or
compute their NAV's on days when the Exchange is closed.


Equity securities are valued based on market value if market quotations are
readily available. Debt securities (other than short-term obligations) normally
are valued based on pricing service valuations. All securities of the Money
Market Fund are valued at amortized cost. Debt obligations in the other Funds
with a remaining maturity of 60 days or less are valued at amortized cost when
amortized cost is considered to represent fair value. Values for short-term
obligations of the other Funds having a remaining maturity of more than 60 days
are based upon readily available market quotations. In other cases, debt and
equity securities and any other assets are valued at their fair value following
procedures approved by the Trustees.

Certain foreign markets may be open on days when the Funds do not accept orders
or price their shares. As a result, the NAV of a Fund's shares may change on
days when shareholders will not be able to buy or sell shares.


                        Purchase and Redemption of Shares
                        ---------------------------------

Shares of the Funds currently are purchased only by Separate Accounts which are
the funding mechanisms for variable annuity contracts and variable life
insurance policies. The Distributor, Allmerica Investments, Inc., at its
expense, may provide promotional incentives to dealers who sell variable annuity
contracts which invest in the Funds. The Trust has obtained an exemptive order
from the Securities and Exchange Commission to permit Fund shares to be sold to
variable annuity and variable life insurance separate accounts of both
affiliated and unaffiliated life insurance companies and certain qualified
pension and retirement plans. Material irreconcilable conflicts may arise among
various insurance policy owners and plan participants. The Trustees will monitor
events to identify any material conflicts and determine if any action should be
taken to resolve such conflict.

No fee is charged by the Trust on redemption. The variable contracts funded
through the Separate Accounts are sold subject to certain fees and charges which
may include sales and redemption charges. See the prospectuses for the variable
insurance products.

Normally, redemption payments will be made within seven days after the Trust
receives a written redemption request. Redemptions may be suspended when trading
on the New York Stock Exchange is restricted or when permitted by the Securities
and Exchange Commission.


                                                   -----------------------------
                                                   Allmerica Investment Trust

28
<PAGE>

                             Distributions and Taxes
                             -----------------------

Distributions
Each Fund pays out substantially all of its net investment income and net
capital gains to shareholders each year. Net investment income is paid quarterly
in the case of the Select Growth and Income Fund and Select Investment Grade
Income Fund; annually in the case of the Select Emerging Markets Fund, Select
Aggressive Growth Fund, Select Capital Appreciation Fund, Select Value
Opportunity Fund, Select International Equity Fund, Select Growth Fund and
Select Strategic Growth Fund; and daily in the case of the Money Market Fund.
Distributions of net capital gains for the year, if any, are made annually. All
dividends and capital gain distributions are applied to purchase additional Fund
shares at net asset value as of the payment date. Fund shares are held by the
Separate Accounts and any distributions are reinvested automatically by the
Separate Accounts.

Taxes
The Trust seeks to comply with the provisions of the Internal Revenue Code
applicable to regulated investment companies so that the Trust will not be
subject to federal income tax. Under current tax law, dividend or capital gain
distributions from any Fund are not currently taxable when left to accumulate
within a variable annuity or variable life insurance contract. Withdrawals from
a contract generally are subject to ordinary income tax and, in many cases, to
an additional 10% penalty tax on withdrawals before age 591/2. Tax consequences
to investors in the Separate Accounts which are invested in the Trust are
described in more detail in the prospectuses for those accounts.



                   [GRAPHIC APPEARS HERE] Financial Highlights
                                          --------------------

<TABLE>
<CAPTION>
                         Income from Investment Operations                             Less Distributions
                   --------------------------------------------- -----------------------------------------------------------------
                                         Net Realized
                      Net                    and                            Distributions
                     Asset       Net      Unrealized             Dividends    from Net
                     Value   Investment  Gain (Loss)  Total from  from Net    Realized    Distributions
    Year Ended     Beginning   Income         on      Investment Investment    Capital         in          Return of     Total
   December 31,     of Year  (Loss)(/2/) Investments  Operations   Income       Gains        Excess         Capital  Distributions
   ------------    --------- ----------- ------------ ---------- ---------- ------------- -------------    --------- -------------
 <S>               <C>       <C>         <C>          <C>        <C>        <C>           <C>              <C>       <C>
 Select Emerging
     Markets
    Fund(/1/)
       1999         $0.784     $0.001       $0.513      $0.514    $(0.006)     $   --        $   --          $  --      $(0.006)
       1998(D)       1.000      0.006       (0.221)     (0.215)    (0.001)         --            --             --       (0.001)
      Select
    Aggressive
   Growth Fund
       1999          2.460     (0.012)       0.963       0.951         --          --            --             --           --
       1998          2.225     (0.008)       0.243       0.235         --          --            --             --           --
       1997          2.037     (0.009)       0.387       0.378         --      (0.182)       (0.008)(/3/)       --       (0.190)
       1996          1.848     (0.009)       0.351       0.342         --      (0.153)           --             --       (0.153)
       1995          1.397     (0.001)       0.452       0.451         --          --            --             --           --
  Select Capital
   Appreciation
    Fund(/1/)
       1999          1.640     (0.007)       0.423       0.416         --      (0.003)           --             --       (0.003)
       1998          1.698     (0.006)       0.241       0.235         --      (0.293)           --             --       (0.293)
       1997          1.485     (0.005)       0.218       0.213         --          --            --             --           --
       1996          1.369     (0.003)       0.124       0.121         --      (0.005)           --             --       (0.005)
       1995(E)       1.000     (0.001)       0.397       0.396         --      (0.027)           --             --       (0.027)
   Select Value
   Opportunity
    Fund(/1/)
       1999          1.686      0.006       (0.077)     (0.071)        --      (0.094)           --             --       (0.094)
       1998          1.626      0.014        0.066       0.080     (0.014)     (0.006)           --             --       (0.020)
       1997          1.511      0.010        0.364       0.374     (0.010)     (0.249)           --             --       (0.259)
       1996          1.238      0.011        0.342       0.353     (0.011)     (0.069)           --             --       (0.080)
       1995          1.089      0.009        0.183       0.192     (0.009)     (0.033)       (0.001)(/3/)       --       (0.043)
      Select
  International
   Equity Fund
       1999          1.542      0.012        0.477       0.489         --          --            --             --           --
       1998          1.341      0.014        0.207       0.221     (0.020)         --            --             --       (0.020)
       1997          1.356      0.015        0.049       0.064     (0.019)     (0.046)       (0.014)(/4/)       --       (0.079)
       1996          1.136      0.011        0.238       0.249     (0.012)     (0.003)       (0.014)(/4/)       --       (0.029)
       1995          0.963      0.013        0.176       0.189     (0.011)     (0.005)           --             --       (0.016)
<CAPTION>
                      Net
                    Increase
                   (Decrease)
                       in
    Year Ended     Net Asset
   December 31,      Value
   ------------    ----------
 <S>               <C>
 Select Emerging
     Markets
    Fund(/1/)
       1999          $0.508
       1998(D)       (0.216)
      Select
    Aggressive
   Growth Fund
       1999           0.951
       1998           0.235
       1997           0.188
       1996           0.189
       1995           0.451
  Select Capital
   Appreciation
    Fund(/1/)
       1999           0.413
       1998          (0.058)
       1997           0.213
       1996           0.116
       1995(E)        0.369
   Select Value
   Opportunity
    Fund(/1/)
       1999          (0.165)
       1998           0.060
       1997           0.115
       1996           0.273
       1995           0.149
      Select
  International
   Equity Fund
       1999           0.489
       1998           0.201
       1997          (0.015)
       1996           0.220
       1995           0.173
</TABLE>
- ------------------
*   Annualized
**  Not Annualized
(A) Including reimbursements, waivers, and reductions.
(B) Excluding reductions. Certain Portfolios have entered into varying arrange-
    ments with brokers who reduced a portion of the Portfolio's expenses.
(C) Excluding reimbursements and reductions.
(D) For period ended December 31, 1998.
(E) For period ended December 31, 1995.
(1) The Select Emerging Markets Fund commenced operations on February 20, 1998.
    The Select Capital Appreciation Fund commenced operations on April 28, 1995
    and changed sub-advisers on April 1, 1998. The Select Value Opportunity
    Fund changed sub-advisers on January 1, 1997.
(2) Net investment income (loss) per share before reimbursement of fees by the
    investment adviser or reductions were $0.000 in 1999, $0.004 in 1998 for
    Select Emerging Markets Fund; $(0.013) in 1999, $(0.009) in 1998 and
    $(0.010) in 1997 for Select Aggressive Growth Fund; $(0.001) in 1995 for
    Select Capital Appreciation Fund; $0.005 in 1999, $0.013 in 1998, $0.009 in
    1997 and $0.010 in 1996 for Select Value Opportunity Fund; and $0.011 in
    1999, $0.014 in 1998, $0.015 in 1997 and $0.011 in 1996 for Select Interna-
    tional Equity Fund.
(3) Distributions in excess of net realized capital gains.
(4) Distributions in excess of net investment income.

                            Ratios/Supplemental Data
        -----------------------------------------------------
                          Ratios To Average Net Assets
               ----------------------------------------
<TABLE>
<CAPTION>
Net Asset             Net Assets
  Value                 End of        Net                                                      Portfolio
 End of    Total        Period    Investment    Operating Expenses        Management Fee       Turnover
 Period    Return      (000's)   Income (Loss)  (A)      (B)      (C)      Gross      Net        Rate
- ---------  ------     ---------- ------------- ------   ------   ------   --------   -------   ---------
<S>        <C>        <C>        <C>           <C>      <C>      <C>      <C>        <C>       <C>
 $ 1.292    65.72%    $   50,452      0.25%      1.88%    1.92%    1.92%     1.35%      1.35%      60%
   0.784   (21.46)%**     20,873      0.96%*     2.19%*   2.19%*   2.54%*    1.35%*     1.00%*     62%**
   3.411    38.66%     1,015,699     (0.46)%     0.88%    0.91%    0.91%     0.85%      0.85%     101%
   2.460    10.56%       752,741     (0.36)%     0.92%    0.95%    0.95%     0.88%      0.88%      99%
   2.225    18.71%       604,123     (0.45)%     0.99%    1.04%    1.04%     0.95%      0.95%      95%
   2.037    18.55%       407,442     (0.53)%     1.08%    1.08%    1.08%     1.00%      1.00%     113%
   1.848    32.28%       254,872     (0.07)%     1.09%      --     1.09%     1.00%      1.00%     104%
   2.053    25.36%       417,087     (0.42)%     0.98%    0.98%    0.98%     0.91%      0.91%      61%
   1.640    13.88%       310,582     (0.47)%     1.02%    1.04%    1.04%     0.94%      0.94%     141%
   1.698    14.28%       240,526     (0.38)%     1.13%    1.13%    1.13%     0.98%      0.98%     133%
   1.485     8.80%       142,680     (0.32)%     1.13%    1.13%    1.13%     1.00%      1.00%      98%
   1.369    39.56%**      41,376     (0.25)%*    1.35%*     --     1.42%*    1.00%*     0.93%*     95%**
   1.521    (4.70)%      308,331      0.43%      0.88%    0.97%    0.97%     0.90%      0.90%      98%
   1.686     4.87%       268,405      0.95%      0.94%    0.98%    0.99%     0.91%      0.90%      73%
   1.626    24.85%       202,139      0.73%      0.98%    1.04%    1.06%     0.92%      0.90%     110%
   1.511    28.53%       113,969      0.91%      0.95%    0.97%    0.97%     0.85%      0.85%      20%
   1.238    17.60%        64,575      0.86%      1.01%      --     1.01%     0.85%      0.85%      17%
   2.031    31.71%       679,341      0.69%      1.01%    1.02%    1.02%     0.89%      0.89%      18%
   1.542    16.48%       505,553      0.99%      1.01%    1.02%    1.02%     0.90%      0.90%      27%
   1.341     4.65%       397,915      1.17%      1.15%    1.17%    1.17%     0.97%      0.97%      20%
   1.356    21.94%       246,877      1.22%      1.20%    1.23%    1.23%     1.00%      1.00%      18%
   1.136    19.63%       104,312      1.68%      1.24%      --     1.24%     1.00%      1.00%      24%
</TABLE>

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                               Income from Investment Operations
                         ---------------------------------------------
                                               Net Realized
                            Net                    and
                           Asset       Net      Unrealized
                           Value   Investment  Gain (Loss)  Total from
                         Beginning   Income         on      Investment
Year Ended December 31,  of Period (Loss)(/2/) Investments  Operations
- -----------------------  --------- ----------- ------------ ----------
<S>                      <C>       <C>         <C>          <C>
Select Growth Fund(/1/)
         1999             $2.428     $(0.002)     $0.709     $ 0.707
         1998              1.811       0.002       0.638       0.640
         1997              1.430       0.006       0.480       0.486
         1996              1.369       0.005       0.297       0.302
         1995              1.099          --       0.270       0.270
   Select Strategic
   Growth Fund(/1/)
         1999              0.973       0.003       0.153       0.156
         1998(D)           1.000       0.002      (0.027)     (0.025)
   Select Growth and
   Income Fund(/1/)
         1999              1.779       0.022       0.298       0.320
         1998              1.552       0.020       0.233       0.253
         1997              1.405       0.020       0.293       0.313
         1996              1.268       0.020       0.246       0.266
         1995              1.027       0.019       0.290       0.309
<CAPTION>
                                              Less Distributions
                         --------------------------------------------------------------
                                                                                           Net
                                                                                         Increase
                         Dividends    Distributions                                     (Decrease)
                          from Net      from Net    Distributions Return                    in
                         Investment     Realized         in         of        Total     Net Asset
Year Ended December 31,    Income     Capital Gains    Excess     Capital Distributions   Value
- ------------------------ ------------ ------------- ------------- ------- ------------- ----------
<S>                      <C>          <C>           <C>           <C>     <C>           <C>
Select Growth Fund(/1/)
         1999             $(0.001)       $(0.085)        $--        $--      $(0.086)      0.621
         1998                  --(3)      (0.023)         --         --       (0.023)      0.617
         1997              (0.006)        (0.099)         --         --       (0.105)      0.381
         1996              (0.005)        (0.236)         --         --       (0.241)      0.061
         1995                  --             --          --         --           --       0.270
   Select Strategic
   Growth Fund(/1/)
         1999              (0.003)            --          --         --       (0.003)      0.153
         1998(D)           (0.002)            --          --         --       (0.002)     (0.027)
   Select Growth and
   Income Fund(/1/)
         1999              (0.021)        (0.145)         --         --       (0.166)      0.154
         1998              (0.020)        (0.006)         --         --       (0.026)      0.227
         1997              (0.020)        (0.146)         --         --       (0.166)      0.147
         1996              (0.020)        (0.109)         --         --       (0.129)      0.137
         1995              (0.019)        (0.049)         --         --       (0.068)      0.241
</TABLE>
- ------------------------------------
*   Annualized
**  Not Annualized
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.
(D)  For period ended December 31, 1998.
(1)  The Select Growth Fund changed sub-advisers on July 1, 1996. The Select
     Strategic Growth Fund commenced operations on February 20, 1998 and changed
     sub-advisers on April 1, 2000. The Select Growth and Income Fund changed
     sub-advisers on April 1, 1999.
(2)  Net investment income (loss) per share before reimbursement of fees by the
     investment adviser or reductions were $(0.003) in 1999, $0.001 in 1998,
     $0.006 in 1997 and $0.005 in 1996 for Select Growth Fund; $0.003 in 1999,
     $(0.001) in 1998 for Select Strategic Growth Fund; $0.019 in 1999, $0.027
     in 1998, $0.038 in 1997 and $0.046 in 1996 for Growth Fund and $0.022 in
     1999, $0.019 in 1998, $0.019 in 1997 and $0.019 in 1996 for the Select
     Growth and Income Fund.
(3)  Dividends from net investment income are less than $0.0005.

<TABLE>
<CAPTION>
                            Ratios/Supplemental Data
           ---------------------------------------------------------------------
                              Ratios To Average Net Assets
                      ---------------------------------------------------
                      Net Assets
Net Asset               End of        Net        Operating          Management     Portfolio
Value End   Total       Period    Investment      Expenses             Fee         Turnover
of Period  Returns     (000's)   Income (Loss) (A)    (B)    (C)    Gross   Net      Rate
- ---------  -------    ---------- ------------- ----   ----   ----   -----   ----   ---------
<S>        <C>        <C>        <C>           <C>    <C>    <C>    <C>     <C>    <C>
 $3.049     29.80%    $1,216,365    (0.08)%    0.81%  0.83%  0.83%  0.78%   0.78%      84%
  2.428     35.44%       815,390      0.08%    0.85%  0.87%  0.87%  0.82%   0.82%      86%
  1.811     34.06%       470,356      0.42%    0.91%  0.93%  0.93%  0.85%   0.85%      75%
  1.430     22.02%       228,551      0.38%    0.92%  0.93%  0.93%  0.85%   0.85%     159%
  1.369     24.59%       143,125      0.02%    0.97%    --   0.97%  0.85%   0.85%      51%
  1.126     16.06%        31,254      0.41%    1.17%  1.20%  1.20%  0.85%   0.85%      58%
  0.973     (2.47)%**     14,839      0.41%*   1.14%* 1.20%* 1.66%* 0.85%*  0.39%*     24%**
  1.933     18.43%       844,538      1.17%    0.73%  0.74%  0.74%  0.67%   0.67%     131%
  1.779     16.43%       646,086      1.26%    0.70%  0.73%  0.73%  0.68%   0.68%     112%
  1.552     22.51%       473,552      1.34%    0.77%  0.80%  0.80%  0.73%   0.73%      71%
  1.405     21.26%       295,638      1.44%    0.80%  0.83%  0.83%  0.75%   0.75%      78%
  1.268     30.32%       191,610      1.69%    0.85%    --   0.85%  0.75%   0.75%     112%
</TABLE>

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                              Income from Investment Operations                             Less Distributions
                  --------------------------------------------------------- ------------------------------------------------------
                                         Net Realized
                     Net                     and                            Distributions
                    Asset       Net       Unrealized             Dividends    from Net
                    Value    Investment  Gain (Loss)  Total from  from Net    Realized    Distributions
   Year Ended     Beginning    Income         on      Investment Investment    Capital         in          Return of     Total
  December 31,     of Year     (Loss)    Investments  Operations   Income       Gains        Excess         Capital  Distributions
  ------------    --------- ------------ ------------ ---------- ---------- ------------- -------------    --------- -------------
<S>               <C>       <C>          <C>          <C>        <C>        <C>           <C>              <C>       <C>
Investment Grade
Income Fund(1)
      1999          1.132      0.068        (0.079)     (0.011)    (0.069)      (0.001)          --            --       (0.070)
      1998          1.112      0.067         0.020       0.087     (0.067)          --           --            --       (0.067)
      1997          1.084      0.071         0.028       0.099     (0.071)          --           --            --       (0.071)
      1996          1.117      0.070        (0.033)      0.037     (0.070)          --           --            --       (0.070)
      1995          1.012      0.071         0.106       0.177     (0.071)          --       (0.001)(2)        --       (0.072)
  Money Market
      Fund
      1999          1.000      0.051            --       0.051     (0.051)          --           --            --       (0.051)
      1998          1.000      0.054            --       0.054     (0.054)          --           --            --       (0.054)
      1997          1.000      0.053            --       0.053     (0.053)          --           --            --       (0.053)
      1996          1.000      0.052            --       0.052     (0.052)          --           --            --       (0.052)
      1995          1.000      0.057            --       0.057     (0.057)          --           --            --       (0.057)
<CAPTION>
                     Net
                   Increase
                  (Decrease)
                      in
   Year Ended     Net Asset
  December 31,      Value
  ------------    ----------
<S>               <C>
Investment Grade
Income Fund(/2/)
      1999          (0.081)
      1998           0.020
      1997           0.028
      1996          (0.033)
      1995           0.105
  Money Market
      Fund
      1999              --
      1998              --
      1997              --
      1996              --
      1995              --
</TABLE>
- ------------------------------------
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.
(1)  Effective May 1, 2000, the name of the Investment Grade Income Fund was
     changed to the Select Investment Grade Income Fund.
(2)  Distributions in excess of net investment income.

<TABLE>
<CAPTION>
                           Ratios/Supplemental Data
           ---------------------------------------------------------------
                            Ratios To Average Net Assets
                    ------------------------------------------------
                    Net Assets
Net Asset             End of        Net        Operating       Management   Portfolio
Value End  Total       Year     Investment      Expenses          Fee       Turnover
 of Year   Return    (000's)   Income (Loss) (A)   (B)   (C)   Gross  Net     Rate
- ---------  ------   ---------- ------------- ----  ----  ----  -----  ----  ---------
<S>        <C>      <C>        <C>           <C>   <C>   <C>   <C>    <C>   <C>
  1.051    (0.97)%   240,541       6.22%     0.50% 0.50% 0.50% 0.43%  0.43%     75%
  1.132     7.97%    230,623       6.01%     0.52% 0.52% 0.52% 0.43%  0.43%    158%
  1.112     9.45%    189,503       6.48%     0.51% 0.51% 0.51% 0.41%  0.41%     48%
  1.084     3.56%    157,327       6.50%     0.52% 0.52% 0.52% 0.40%  0.40%    108%
  1.117    17.84%    141,625       6.66%     0.53%   --  0.53% 0.41%  0.41%    126%
  1.000     5.19%    513,606       5.09%     0.29% 0.29% 0.29% 0.24%  0.24%    N/A
  1.000     5.51%    336,253       5.36%     0.32% 0.32% 0.32% 0.26%  0.26%    N/A
  1.000     5.47%    260,620       5.33%     0.35% 0.35% 0.35% 0.27%  0.27%    N/A
  1.000     5.36%    217,256       5.22%     0.34% 0.34% 0.34% 0.28%  0.28%    N/A
  1.000     5.84%    155,211       5.68%     0.36%   --  0.36% 0.29%  0.29%    N/A
</TABLE>

The financial highlights tables are intended to help you understand each Fund's
financial performance for the past five years (or, if shorter, the period of the
Fund's operations). Certain information reflects financial results for a single
Fund share. The total returns in the tables represent the rate that an investor
would have earned or lost on an investment in a Fund (assuming reinvestment of
all dividends and distributions). This information has been audited by
PricewaterhouseCoopers LLP, whose report, along with each Fund's financial
statements, are included in the Statement of Additional Information or annual
report, which is available upon request.


- -----------------------------
Allmerica Investment Trust

                                                                              29
<PAGE>

Appendix

[GRAPHIC]

Investment Techniques and Strategies
In managing its portfolios of investments, the Trust may make use of the
following investment techniques and strategies:

Symbols

   o    Permitted
   -- Not Permitted

<TABLE>
<CAPTION>
                                                  Select         Select        Select         Select         Select
                                                 Emerging      Aggressive      Capital         Value      International      Select
                                                 Markets         Growth      Appreciation   Opportunity      Equity          Growth
Investment Technique/Strategy                      Fund           Fund           Fund          Fund           Fund            Fund
- -----------------------------                      ----           ----           ----          ----           ----            ----
<S>                                              <C>          <C>            <C>            <C>           <C>                <C>
Asset-Backed Securities                             --             --             --             --             --             --
Financial Futures Contracts
      and Related Options                           o              o              o              o              o              o
Foreign Securities                                  o              o              o              o              o              o
Forward Commitments                                 --             --             o              --             --             --
Forward Contracts on Foreign Currencies             o              --             o              --             o              o
High Yield Securities                               o              --             o              --             --             o
Investments in Money Market Securities              o              o              o              o              o              o
Mortgage-Backed Securities                          --             --             --             --             --             --
Purchasing Options                                  o              o              o              o              o              o
Repurchase Agreements                               o              o              o              o              o              o
Restricted Securities                               o              o              o              o              o              o
Reverse Repurchase Agreements                       --             --             o              --             --             --
Securities Lending                                  o              o              o              o              o              o
Stand-By Commitments                                --             --             --             --             --             --
Stripped Mortgage-Backed Securities                 --             --             --             --             --             --
Swap and Swap-Related Products                      --             --             o              --             --             --
When-Issued Securities                              o              o              o              o              o              o
Writing Covered Options                             o              o              o              o              o              o
- -----------------------                             -              -              -              -              -              -
<CAPTION>
                                                  Select          Select      Select Investment
                                                 Strategic        Growth             Grade           Money
                                                  Growth        and Income           Income          Market
Investment Technique/Strategy                      Fund           Fund                Fund            Fund
                                                   ----           ----                ----            ----
<S>                                              <C>            <C>                 <C>             <C>
Asset-Backed Securities                             --             o                    o              o
Financial Futures Contracts
      and Related Options                           o              o                    o              --
Foreign Securities                                  o              o                    o              o
Forward Commitments                                 --             --                   o              o
Forward Contracts on Foreign Currencies             --             --                   --             --
High Yield Securities                               --             o                    --             --
Investments in Money Market Securities              o              o                    o              o
Mortgage-Backed Securities                          --             --                   o              --
Purchasing Options                                  o              o                    o              --
Repurchase Agreements                               o              o                    o              o
Restricted Securities                               o              o                    o              o
Reverse Repurchase Agreements                       --             --                   --             --
Securities Lending                                  o              o                    o              o
Stand-By Commitments                                --             --                   o              o
Stripped Mortgage-Backed Securities                 --             --                   o              --
Swap and Swap-Related Products                      --             --                   --             --
When-Issued Securities                              o              o                    o              o
Writing Covered Options                             o              o                    o              --
- -----------------------                             -              -                    -              --
</TABLE>

                                                   -----------------------------
30                                                 Allmerica Investment Trust
<PAGE>

                           Allmerica Investment Trust

                          Select Emerging Markets Fund
                          Select Aggressive Growth Fund
                        Select Capital Appreciation Fund
                          Select Value Opportunity Fund
                        Select International Equity Fund
                               Select Growth Fund
                          Select Strategic Growth Fund
                          Select Growth and Income Fund
                       Select Investment Grade Income Fund
                                Money Market Fund

The Trust's Statement of Additional Information ("SAI") includes additional
information about the Funds. The Trust's annual and semi-annual reports to
shareholders include information about the investments of the Funds. The SAI and
the financial statements included in the Fund's most recent annual report to
shareholders are incorporated by reference into this prospectus, which means
they are part of this prospectus for legal purposes. The Trust's annual report
discusses the market conditions and investment strategies that significantly
affected each Fund's performance during its last fiscal year. You may get free
copies of these materials, request other information about a Fund or make
shareholder inquiries by calling 1-800-828-0540.

You may review and copy information about the Trust, including its SAI, at the
Securities and Exchange Commission's Public Reference Room in Washington, D.C.
You may call the Commission at 1-800-SEC-0330 for information about the
operation of the Public Reference Room. You may also access reports and other
information about the Trust on the Commission's Internet site at
http://www.sec.gov. You may get copies of this information, with payment of a
duplication fee, by writing the Public Reference Section of the Commission,
Washington, D.C. 20549-6009. You may need to refer to the Trust's file number
under the Investment Company Act, which is 811-4138.

                                    ALLMERICA
                                   INVESTMENT
                                      TRUST

               440 Lincoln Street, Worcester, Massachusetts 01653
                                 1-800-828-0540
<PAGE>


Allmerica Investment Trust
- --------------------------

                                                                      Prospectus
                                                                     May 1, 2000

This Prospectus describes the following seven investment Funds of the Trust
which serve as the underlying investments for insurance related accounts.

                          Select Aggressive Growth Fund
                        Select International Equity Fund
                                Core Equity Fund
                                Equity Index Fund
                       Select Investment Grade Income Fund
                              Government Bond Fund
                                Money Market Fund

This Prospectus explains what you should know about each of the Funds. Please
read it carefully before you invest.

A particular Fund may not be available under the variable annuity or variable
life insurance policy which you have chosen. The Prospectus of the specific
insurance product you have chosen will indicate which Funds are available and
should be read in conjunction with this Prospectus. Inclusion in this Prospectus
of a Fund which is not available under your policy is not to be considered a
solicitation.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined that
this Prospectus is adequate or complete. Any representation to the contrary is a
criminal offense.

                                                            ALLMERICA
                                                           INVESTMENT
                                                              TRUST

                                                     440 Lincoln Street
                                                  Worcester, Massachusetts 01653
                                                          1-800-828-0540
<PAGE>

                               Table of Contents

FUND SUMMARIES.......................................................  3

        Objectives, Strategies and Risks.............................  4

              Select Aggressive Growth Fund..........................  4

              Select International Equity Fund.......................  5

              Core Equity Fund.......................................  6

              Equity Index Fund......................................  7

              Select Investment Grade Income Fund....................  8

              Government Bond Fund...................................  9

              Money Market Fund...................................... 10

EXPENSE SUMMARY...................................................... 11

DESCRIPTION OF PRINCIPAL INVESTMENT RISKS............................ 13

OTHER INVESTMENT STRATEGIES.......................................... 15

MANAGEMENT OF THE FUNDS.............................................. 17

PRICING OF FUND SHARES............................................... 22

PURCHASE AND REDEMPTION OF SHARES.................................... 22

DISTRIBUTIONS AND TAXES.............................................. 23



FINANCIAL HIGHLIGHTS................................................. 25

APPENDIX............................................................. 30


                                    LEGEND

Performance                 [GRAPHIC APPEARS HERE]

Investment Objectives       [GRAPHIC APPEARS HERE]

Financial Information       [GRAPHIC APPEARS HERE]

Management of Fund          [GRAPHIC APPEARS HERE]

Risk                        [GRAPHIC APPEARS HERE]

Investment Strategies       [GRAPHIC APPEARS HERE]


- -----------------------------
Allmerica Investment Trust                                                     2
<PAGE>

                                 Fund Summaries
                                 --------------
Allmerica Investment Trust provides a broad range of investment options through
separate investment portfolios, or Funds. Shares of the Funds are sold
exclusively to variable annuity and variable life insurance Separate Accounts
and qualified pension and retirement plans.

The investment manager of the Trust is Allmerica Financial Investment Management
Services, Inc. The Manager is responsible for managing the Trust's daily
business and has general responsibility for the management of the investments of
the Funds. The Manager, at its expense, has contracted with investment
Sub-Advisers to manage the investments of the Funds. Each Sub-Adviser has been
selected on the basis of various factors including management experience,
investment techniques and staffing. See "Management of the Funds" for more
information about the Manager and the Sub-Advisers.

The following summaries describe each Fund's investment objective and principal
investment strategies, identify the principal investment risks of investing in
the Fund and provide performance charts for the Fund. Note that any percentage
limitations listed under a Fund's principal investment strategies apply at the
time of investment. The principal risks are discussed in more detail under
"Description of Principal Investment Risks". The bar charts show how the
investment returns of the shares of a Fund have varied in the past 10 years (or
for the life of the Fund if less than 10 years). The table following each bar
chart shows how the Fund's average annual return for the last one, five and ten
years (or for the life of the Fund, if shorter) compare to those of a
broad-based securities market index. Past performance does not necessarily
indicate how the Fund will perform in the future. The bar charts and tables give
some indication of the risks of investing in each Fund by showing changes in the
Fund's performance. The bar charts and tables do not reflect expenses associated
with the variable insurance product that you are purchasing. If those expenses
had been reflected, the performance shown would have been lower.


- -----------------------------
Allmerica Investment Trust                                                     3
<PAGE>

Objectives, Strategies and Risks

                          Select Aggressive Growth Fund
                          -----------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Nicholas-Applegate Capital Management, L.P.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks above-average
                        capital appreciation by investing primarily in common
                        stocks of companies which are believed to have
                        significant potential for capital appreciation.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To pursue this goal,
                        the Fund looks predominantly for stocks of small and
                        mid-size companies that show potential for rapid growth.
                        The Fund typically invests in companies that, because of
                        positive developments affecting the company, offer the
                        possibility of accelerating earnings. The Sub-Adviser
                        uses systematic, fundamental research in selecting
                        investments for the Fund.

                        Under normal circumstances, the Fund invests at least
                        65% of its assets in common stocks, securities
                        convertible into common stocks and warrants. The Fund
                        also may invest in debt securities and preferred stocks
                        and up to 25% of its assets in foreign securities (not
                        including its investments in American Depositary
                        Receipts or "ADRs").

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Derivatives Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

19.51%      -2.31%      32.28%       18.55%      18.71%      10.56%     38.66%
- ------      ------      ------       ------      ------      ------     ------
1993        1994        1995         1996        1997        1998       1999


During the period shown above the highest quarterly return was 25.64% for the
quarter ended 12/31/99 and the lowest was (22.81)% for the quarter ended
9/30/98.

Performance Table

<TABLE>
<CAPTION>
Average Annual Total Returns
(for the periods ending                     Past               Past              Since Inception
December 31, 1999)                        One Year          Five Years          (August 21, 1992)
- ------------------                        --------          ----------          -----------------
<S>                                       <C>               <C>                 <C>
  Fund Shares                              38.66%             23.32%                  20.71%
  -----------                              ------             ------                  ------

  Russell 2500 Index*                      24.15%             19.43%                  17.37%
  -------------------                      ------             ------                  ------
</TABLE>
* The Russell 2500 Index is an unmanaged composite of 2,500 small-to-mid
  capitalization stocks.

                                                   -----------------------------
4                                                  Allmerica Investment Trust
<PAGE>

Objectives, Strategies and Risks

                        Select International Equity Fund
                        --------------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Bank of Ireland Asset Management (U.S.)
                        Limited

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks maximum long-term
                        total return (capital appreciation and income) primarily
                        by investing in common stocks of established non-U.S.
                        companies.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: Under normal market
                        conditions, at least 65% of the Fund's assets will be
                        invested in the securities of medium and large-size
                        companies located in at least five foreign countries,
                        not including the United States. To achieve its
                        objective, the Fund focuses on equity securities which
                        the Sub-Adviser believes are undervalued in relation to
                        the company's prospects for future earnings growth. The
                        Fund may also buy fixed-income debt securities,
                        primarily for defensive purposes.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Currency Risk

                        . Derivatives Risk

                        . Foreign Investment Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

           19.63%       21.94%       4.65%      16.48%        31.71%
           ------       ------       -----      ------        ------
            1995         1996         1997       1998          1999


During the period shown above the highest quarterly return was 20.89% for the
quarter ended 12/31/99 and the lowest was (17.69)% for the quarter ended
09/30/98.

Performance Table

Average Annual Total Returns
(for the periods ending                Past        Past          Since Inception
December 31, 1999)                     One Year    Five Years    (May 2, 1994)
- ------------------                     --------    ----------    -------------

  Fund Shares                          31.71%      18.54%         15.47%
  -----------                          ------      ------         ------

  Morgan Stanley Capital Intl.
  EAFE Index*                          27.31%      13.15%        11.54%
  -----------                          ------      ------        ------

* The Morgan Stanley Capital International EAFE (Europe, Australia, Far East)
Index, reflecting reinvestment of gross dividends, is an unmanaged
capitalization weighted index of foreign developed country common stocks.


- -----------------------------
Allmerica Investment Trust                                                     5
<PAGE>

Objectives, Strategies and Risks


                                Core Equity Fund
                                ----------------
                           (formerly the Growth Fund)

[GRAPHIC APPEARS HERE]  Sub-Adviser: Miller Anderson & Sherrerd, LLP

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to achieve
                        long-term growth of capital through investments
                        primarily in common stocks and securities convertible
                        into common stocks that are believed to represent
                        significant underlying value in relation to current
                        market prices. Realization of current income, if any, is
                        incidental to this objective.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To pursue its goal, the
                        Fund invests in securities that are diversified with
                        regard to issuers and industries. In selecting
                        securities, the Fund is not limited to any particular
                        style of investing and may invest in stocks considered
                        to be "growth" stocks as well as stocks considered to be
                        "value" stocks. The Fund may invest in well-established
                        or developing companies, both large and small.

                        The Fund normally will invest substantially all of its
                        assets in equity-type securities, including common
                        stocks, warrants, preferred stocks and debt securities
                        convertible into common stock and eligible real estate
                        securities. The Fund may invest up to 25% of its assets
                        in foreign securities (not including its investments in
                        ADRs).

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Derivatives Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."


The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                  1990...........................     -0.30%
                  1991...........................     40.44%
                  1992...........................      7.11%
                  1993...........................      6.66%
                  1994...........................      0.16%
                  1995...........................     32.80%
                  1996...........................     20.19%
                  1997...........................     25.14%
                  1998...........................     19.32%
                  1999...........................     29.33%

During the period shown above the highest quarterly return was 21.48% for the
quarter ended 12/31/98 and the lowest was (14.61)% for the quarter ended
9/30/90.

Performance Table

Average Annual Total Returns
(for the periods ending              Past          Past            Past
December 31, 1999)                   One Year      Five Years      Ten Years
- ------------------                   --------      ----------      ---------

Fund Shares                          29.33%        25.23%          17.31%
- -----------                          ------        ------          ------

S&P 500 Index*                       21.03%        28.55%          18.21%
- --------------                       ------        ------          ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


                                                   -----------------------------
6                                                  Allmerica Investment Trust
<PAGE>

Objectives, Strategies and Risks


                                Equity Index Fund
                                -----------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to achieve
                        investment results that correspond to the aggregate
                        price and yield performance of a representative
                        selection of common stocks that are publicly traded in
                        the United States.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund tries to
                        achieve its objective by attempting to replicate the
                        aggregate price and yield performance of the S&P 500
                        Index. Because of its policy of tracking the S&P 500
                        Index, the Fund does not follow traditional methods of
                        active investment management, which involve buying and
                        selling securities based upon analysis of economic and
                        market factors. The method used to select investments
                        for the Fund involves investing in common stocks in
                        approximately the order of their weightings in the S&P
                        500 Index. Under normal circumstances, the Fund will
                        hold approximately 500 different stocks included in the
                        S&P 500 Index. The Fund will incur expenses that are not
                        reflected in the performance results of the S&P 500
                        Index. Therefore, the return of the Fund may be lower
                        than the return of the S&P 500 Index. These factors,
                        among others, may result in "tracking error", which is a
                        measure of the degree to which the Fund's results differ
                        from the results of the S&P 500 Index.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Derivatives Risk

                        . Market Risk

See "Description of Principal Investment Risks."


The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                  1991..............................    29.16%
                  1992..............................     7.25%
                  1993..............................     9.53%
                  1994..............................     1.06%
                  1995..............................    36.18%
                  1996..............................    22.30%
                  1997..............................    32.41%
                  1998..............................    28.33%
                  1999..............................    20.41%


During the period shown above the highest quarterly return was 21.41% for the
quarter ended 12/31/98 and the lowest was (9.96)% for the quarter ended 9/30/98.

Performance Table
Average Annual Total Returns
(for the periods ending         Past        Past          Since Inception
December 31, 1999)              One Year    Five Years    (September 28, 1990)
- ------------------              --------    ----------    --------------------

Fund Shares                     20.41%      27.77%        20.66%
- -----------                     ------      ------        ------

S&P 500 Index*                  21.03%      28.55%        21.35%
- --------------                  ------      ------        ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


- -----------------------------
Allmerica Investment Trust                                                     7
<PAGE>

Objectives, Strategies and Risks

                                        Select Investment Grade Income Fund
                                        -----------------------------------
                                    (formerly the Investment Grade Income Fund)

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.


[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks as high a level of
                        total return, which includes capital appreciation as
                        well as income, as is consistent with prudent investment
                        management.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To achieve its goal,
                        the Fund invests in investment grade debt securities and
                        money market instruments such as bonds and other
                        corporate debt obligations; obligations issued or
                        guaranteed by the U.S. Government, its agencies or
                        instrumentalities, or money market instruments,
                        including commercial paper, bankers acceptances and
                        negotiable certificates of deposit. The Fund also may
                        invest in mortgage-backed and asset-backed securities.
                        The Fund may invest up to 25% of its assets in foreign
                        securities (not including its investments in ADRs) and
                        up to 25% of its assets in debt obligations of
                        supranational entities.

                        Investment grade securities are rated in the four
                        highest grades by Moody's Investors Services or Standard
                        & Poor's Rating Services or unrated but determined by
                        the Sub-Adviser to be of comparable quality. For more
                        information about rating categories, see the Appendix to
                        the Statement of Additional Information ("SAI"). The
                        Fund may invest in securities with relatively long
                        maturities as well as securities with shorter
                        maturities.

                        The Sub-Adviser actively manages the portfolio with a
                        view to producing a high level of total return for the
                        Fund while avoiding undue risks to capital. The
                        Sub-Adviser attempts to anticipate events leading to
                        price or ratings changes through using in-depth
                        fundamental credit research.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Interest Rate Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

                        . Prepayment Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


                       1990 .................... 8.02%
                       1991 ....................16.75%
                       1992 .................... 8.33%
                       1993 ....................10.80%
                       1994 ....................-2.96%
                       1995 ....................17.84%
                       1996 .................... 3.56%
                       1997 .................... 9.45%
                       1998 .................... 7.97%
                       1999 ....................-0.97%


During the period shown above the highest quarterly return was 6.02% for the
quarter ended 6/30/95 and the lowest was (2.61)% for the quarter ended 3/31/94.


Performance Table
Average Annual Total Returns
(for the periods ending                   Past         Past           Past
December 31, 1999)                        One Year     Five Years     Ten Years
- ------------------                        --------     ----------     ---------

Fund Shares                               -0.97%       7.38%          7.69%
- -----------                               ------       -----          -----

Lehman Brothers
Aggregate Bond Index*                     -0.83%       7.73%          7.69%
- ---------------------                     ------       -----          -----

* The Lehman Brothers Aggregate Bond Index(R) is an unmanaged index of fixed
rate debt issues with an investment grade or higher rating at least one year to
maturity and an outstanding par value of at least $25 million.


                                                   -----------------------------
8                                                  Allmerica Investment Trust
<PAGE>

Objectives, Strategies and Risks


                                Government Bond Fund
                                --------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks high income,
                        preservation of capital, and maintenance of liquidity
                        primarily through investments in debt instruments issued
                        or guaranteed by the U.S. Government or its agencies or
                        instrumentalities ("U.S. Government securities") and in
                        related options, futures, and repurchase agreements.

                        Under normal conditions, at least 80% of the Fund's
                        assets will be invested in U.S. Government securities.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To pursue its
                        objective, the Fund invests in U.S. Government
                        securities, such as Treasury bills, notes, and bonds,
                        which may differ only in their interest rates,
                        maturities and times of issuance. The Fund also may
                        invest in mortgage-backed government securities, other
                        instruments secured by U.S. Government securities,
                        asset-backed securities and separately-traded principal
                        and interest components of U.S. Treasury securities. The
                        Fund may invest up to 25% of its assets in debt
                        obligations of supranational entities.

                        The Sub-Adviser selects securities for the portfolio
                        with a view to producing a high level of current income
                        while avoiding undue risks to capital. The Fund may
                        invest in securities with relatively long maturities as
                        well as securities with shorter maturities.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Credit Risk

                        . Interest Rate Risk

                        . Investment Management Risk

                        . Market Risk

                        . Prepayment Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                 1992.................................      6.59%
                 1993.................................      7.51%
                 1994.................................     -0.88%
                 1995.................................     13.06%
                 1996.................................      3.51%
                 1997.................................      7.08%
                 1998.................................      7.67%
                 1999.................................      0.23%


During the period shown above the highest quarterly return was 4.32% for the
quarter ended 9/30/98 and the lowest was (1.49)% for the quarter ended 3/31/92.

Performance Table
Average Annual Total Returns
(for the periods ending              Past        Past          Since Inception
December 31, 1999)                   One Year    Five Years    (August 26, 1991)
- ------------------                   --------    ----------    -----------------

Fund Shares                          0.23%       6.22%         6.16%
- -----------                          -----       -----         -----

Lehman Brothers
Intermediate Government
Bond Index*                          0.50%       6.93%         6.55%
- -----------                          -----       -----         -----

*    The Lehman Brothers Intermediate Government Bond Index(R) is an unmanaged
     index of U.S. Government and Agency bonds with remaining maturities of one
     to ten years.

- -----------------------------
Allmerica Investment Trust
                                                                               9
<PAGE>

Objectives, Strategies and Risks


                                Money Market Fund
                                -----------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to obtain maximum
                        current income consistent with preservation of capital
                        and liquidity.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund seeks to
                        achieve its objective by investing in high quality money
                        market instruments such as obligations issued or
                        guaranteed by the United States Government, its
                        agencies, or instrumentalities; commercial paper;
                        obligations of banks or savings and loan associations
                        including bankers acceptances and certificates of
                        deposit; repurchase agreements and cash and cash
                        equivalents. The Fund may invest up to 25% of its assets
                        in U.S. dollar denominated foreign debt securities and
                        short-term instruments (not including investments in
                        ADRs).

                        Any security purchased for the Fund must receive the
                        highest or second highest quality rating by at least two
                        recognized rating agencies or by one if only one has
                        rated the security. If the security is unrated the
                        security must be seen by the Sub-Adviser as having
                        comparable quality. Portfolio securities will have a
                        remaining maturity of 397 days or less and the portfolio
                        is managed to maintain a dollar-weighted maturity of 90
                        days or less.

                        The Fund attempts to maintain a constant net asset value
                        of $1.00 per share but it may not be able to do so due
                        to adverse market conditions or other factors and it is
                        possible for investors to lose money by investing in the
                        Fund. An investment in the Fund is not a bank deposit
                        and is not insured or guaranteed by the Federal Deposit
                        Insurance Corporation or any other government agency.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Credit Risk

                        . Interest Rate Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns[GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


8.17%   6.22%   3.78%   3.00%   3.93%   5.84%   5.36%   5.47%   5.51%   5.19%
- -----   -----   -----   -----   -----   -----   -----   -----   -----   -----
1990    1991    1992    1993    1994    1995    1996    1997    1998    1999


During the period shown above the highest quarterly return was 2.01% for the
quarter ended 06/30/90 and the lowest was 0.73% for the quarter ended 6/30/93.


Performance Table

Average Annual Total Returns
(for the periods ending                      Past          Past          Past
December 31, 1999)                        One Year    Five Years    Ten Years
- ------------------                        --------    ----------    ---------

  Fund Shares                                5.19%         5.47%        5.23%
  -----------                                -----         -----        -----

  IBC/Donoghue First Tier
  Money Market Index*                        4.57%         4.97%        4.79%
  -------------------                        -----         -----        -----

* IBC/Donoghue is an independent firm that tracks regulated money market funds
on a yield, shareholder, assets size and portfolio allocation basis.

The Fund's 7-day yield ending December 31, 1999 was 5.57%.


                                                 -------------------------------
                                                   Allmerica Investment Trust
10
<PAGE>

                                 Expense Summary

Expenses are one of several factors to consider when investing in a Fund.
Expenses shown are based on expenses incurred in respect of shares of the Funds
for the 1999 fiscal year. The Examples show the cumulative expenses attributable
to a hypothetical $10,000 investment in each Fund over specified periods.

Fees and Expenses of the Funds

This table describes the fees and expenses that you may pay if you invest in the
Funds. Please note that the expenses listed below do not include the expenses of
the applicable variable insurance product that you are purchasing. You should
refer to the variable insurance product prospectus for more information relating
to the fees and expenses of that product, which are in addition to the expenses
of the Funds.
<TABLE>
<CAPTION>

                                                               Annual Fund Operating Expenses
                                           Shareholder      (expenses deducted from Fund assets)              Total Annual
                                              Fees                                                                   Fund
                                      (fees paid directly     Management      Distribution           Other         Operating
                                     from your investment)       Fees         (12b-1) Fees          Expenses        Expenses
                                     ---------------------       ----         ------------          --------        --------
 <S>                                 <C>                      <C>             <C>                   <C>           <C>
 Select Aggressive Growth Fund                None              0.81%*            None               0.06%        0.87%(1),(2)*
 -----------------------------                ----              -----             ----               -----

 Select International Equity Fund             None              0.89%             None               0.13%        1.02%(1),(2)
 --------------------------------             ----              -----             ----               -----

 Core Equity Fund                             None              0.43%             None               0.05%        0.48%(1),(2)
 ----------------                             ----              -----             ----               -----

 Equity Index Fund                            None              0.28%             None               0.07%        0.35%(1)
 -----------------                            ----              -----             ----               -----

 Select Investment Grade Income Fund          None              0.43%             None               0.07%        0.50%(1)
 -----------------------------------          ----              -----             ----               -----

 Government Bond Fund                         None              0.50%             None               0.12%        0.62%(1)
 --------------------                         ----              -----             ----               -----

 Money Market Fund                            None              0.24%             None               0.05%        0.29%(1)
 -----------------                            ----              -----             ----               -----
</TABLE>

*    Effective September 1, 1999, the management fee rate for the Select
     Aggressive Growth Fund was revised. The Management Fee and Total Annual
     Fund Operating Expense ratios shown in the table above have been adjusted
     to assume that the revised rate took effect on January 1, 1999.

(1)  Through December 31, 2000, Allmerica Financial Investment Management
     Services, Inc. (the "Manager") has declared a voluntary expense limitation
     of 1.35% of average net assets for the Select Aggressive Growth Fund, 1.50%
     for the Select International Equity Fund, 1.20% for the Core Equity Fund,
     1.00% for the Select Investment Grade Income Fund and Government Bond Fund,
     and 0.60% for the Equity Index Fund and Money Market Fund. The total
     operating expenses of these Funds of the Trust were less than their
     respective expense limitations throughout 1999.

     The declaration of a voluntary management fee or expense limitation in any
     year does not bind the Manager to declare future expense limitations with
     respect to these Funds. These limitations may be terminated at any time.

(2)  These Funds have entered into agreements with brokers whereby brokers
     rebate a portion of commissions. Had these amounts been treated as
     reductions of expenses, the total annual fund operating expense ratios
     would have been 0.88% for the Select Aggressive Growth Fund, 1.01% for the
     Select International Equity Fund, and 0.45% for the Core Equity Fund.

- -----------------------------
Allmerica Investment Trust
                                                                              11
<PAGE>

Example

This Example is intended to help you compare the cost of investing in a Fund
with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in a Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. The
Example also assumes that your investment earns a 5% return each year and that
the Fund's operating expenses remain the same. Although your actual costs may be
higher or lower, based on these assumptions your costs would be:

  Fund                                   1 Year    3 Years    5 Years   10 Years
  ----                                   ------    -------    -------   --------

  Select Aggressive Growth Fund             $93       $291       $506    $1,123
  -----------------------------             ---       ----       ----    ------

  Select International Equity Fund         $105       $326       $566    $1,253
  --------------------------------         ----       ----       ----    ------

  Core Equity Fund                          $49       $154       $269      $605
  ----------------                          ---       ----       ----      ----

  Equity Index Fund                         $36       $113       $197      $444
  -----------------                         ---       ----       ----      ----

  Select Investment Grade Income Fund       $51       $161       $280      $629
  -----------------------------------       ---       ----       ----      ----

  Government Bond Fund                      $64       $199       $347      $776
  --------------------                      ---       ----       ----      ----

  Money Market Fund                         $30       $93        $163      $369
  -----------------                         ---       ---        ----      ----


                                                   -----------------------------
                                                     Allmerica Investment Trust
12
<PAGE>

               [GRAPHIC] Description of Principal Investment Risks
               ---------------------------------------------------

The following is a summary of the principal risks of investing in a Fund and the
factors likely to cause the value of your investment in the Fund to decline. The
principal risks applicable to each Fund are identified under "Fund Summaries".
There are also many factors that could cause the value of your investment in a
Fund to decline which are not described here. It is important to remember that
there is no guarantee that the Funds will achieve their investment objective,
and an investor in any of the Funds could lose money.

Company Risk

A Fund's equity and fixed income investments in a company often fluctuate based
on:

 . the firm's actual and anticipated earnings,

 . changes in management, product offerings and overall financial strength and

 . the potential for takeovers and acquisitions.

This is due to the fact that prices of securities react to the fiscal and
business conditions of the company that issued the securities. Factors affecting
a company's particular industry, such as increased production costs, also may
affect the value of its securities.

Smaller companies with market capitalizations of less than $1 billion or so are
more likely than larger companies to have limited products lines or smaller
markets for their goods and services. Small company stocks may not trade very
actively, and their prices may fluctuate more than stocks of other companies as
a result of lower liquidity. They may depend on a small or inexperienced
management group. Stocks of smaller companies also may be more vulnerable to
negative changes than stocks of larger companies.

Credit Risk

Credit risk is the risk that the issuer of a fixed income security will not be
able to pay principal and interest when due. There are different levels of
credit risk. Funds that invest in lower-rated securities have higher levels of
credit risk. The price of a fixed income security can be expected to fall if the
issuer defaults on its obligation to pay principal or interest, the rating
agencies downgrade the issuer's credit rating or there is negative news that
affects the market's perception of the issuer's credit risk.

Currency Risk

This is the risk that the value of a Fund's investments may decline due to
fluctuations in exchange rates between the U.S. dollar and foreign currencies.
Funds that invest in securities denominated in or are receiving revenues in
foreign currencies are subject to currency risk. There is often a greater risk
of currency fluctuations and devaluations in emerging markets countries.

Derivatives Risk

A Fund may use derivatives to hedge against an opposite position that the Fund
also holds. While hedging can reduce or eliminate losses, it can also reduce or
eliminate gains. When a Fund uses derivatives to hedge, it takes the risk that
changes in the value of the derivative will not match those of the asset being
hedged. Incomplete correlation can result in unanticipated losses. A Fund may
also use derivatives as an investment vehicle to gain market exposure. Gains or
losses from derivative investments may be substantially greater than the
derivative's original cost. When a Fund uses derivatives, it is also subject to
the risk that the other party to the agreement will not be able to perform.
Additional risks associated with derivatives include mispricing and improper
valuation.


- -----------------------------
Allmerica Investment Trust
                                                                              13
<PAGE>

Foreign Investment Risk

Investing in foreign securities involves risks relating to political, social and
economic developments abroad, as well as risks resulting from the differences
between the regulations to which U.S. and foreign issuers and markets are
subject. These risks may include the seizure by the government of company
assets, excessive taxation, withholding taxes on dividends and interest,
limitations on the use or transfer of portfolio assets, and political or social
instability. In the event of nationalization, expropriation or other
confiscation, a Fund could lose its entire investment. Funds investing in
foreign securities may experience rapid changes in value. One reason for this
volatility is that the securities markets of many foreign countries are
relatively small, with a limited number of companies representing a small number
of industries. Enforcing legal rights may be difficult, costly and slow in
foreign countries. Also, foreign companies may not be subject to governmental
supervision or accounting standards comparable to those applicable to U.S.
companies, and there may be less public information about their operations.

Interest Rate Risk

When interest rates rise, the prices of fixed income securities in a Fund's
portfolio will generally fall. Conversely, when interest rates fall, the prices
of fixed income securities in the Fund's portfolio will generally rise. Even
Funds that invest in the highest quality debt securities are subject to interest
rate risk. Interest rate risk usually will affect the price of a fixed income
security more if the security has a longer maturity because changes in interest
rates are increasingly difficult to predict over longer periods of time. Fixed
income securities with longer maturities will therefore be more volatile than
other fixed income securities with shorter maturities.

Investment Management Risk

Investment management risk is the risk that a Fund does not achieve its
investment objective, even though the Sub-Adviser uses various investment
strategies and techniques.

Liquidity Risk

This is the risk that a Fund will not be able to sell a security at a reasonable
price because there are too few people who actively buy and sell, or trade, that
security on a regular basis. Liquidity risk increases for Funds investing in
foreign investments (especially emerging markets securities), smaller companies,
lower credit quality bonds (also called "junk bonds"), restricted securities,
over-the-counter securities and derivatives.

Market Risk

This is the risk that the price of a security held by a Fund will fall due to
changing economic, political or market conditions or to factors affecting
investor psychology.

Prepayment Risk

While mortgage-backed securities may have a stated maturity, their expected
maturities may vary when interest rates rise or fall. When interest rates fall,
homeowners are more likely to prepay their mortgage loans which may result in an
unforeseen loss of future interest income to a Fund. Also, because prepayments
increase when interest rates fall, the prices of mortgage-backed securities do
not increase as much as other fixed income securities when interest rates fall.


                                                   -----------------------------
                                                     Allmerica Investment Trust
14
<PAGE>

                      [GRAPHIC] Other Investment Strategies
                      -------------------------------------

The Fund Summaries starting on page 3 describe the investment objective and the
principal investment strategies and risks of each Fund. The Funds may at times
use the following investment strategies. Attached as an Appendix is a chart with
a listing of various investment techniques and strategies that the Sub-Advisers
of the Funds may utilize. A Fund may decide that it is in the best interests of
shareholders to make changes to its investment objective and strategies
described in this Prospectus. These investment objectives and strategies may be
changed with the approval of the Board of Trustees, but without shareholder
approval.

Derivative Investments. (applicable to each Fund except the Money Market Fund)
Instead of investing directly in the types of portfolio securities described in
the Summary, each Fund, except the Money Market Fund, may buy or sell a variety
of "derivative" investments to gain exposure to particular securities or
markets. Derivatives are financial contracts whose value depends on, or is
derived from, the value of an underlying asset, reference rate or index. A
Fund's Sub-Adviser will sometimes use derivatives as part of a strategy designed
to reduce other risks and sometimes will use derivatives to enhance returns,
which increases opportunities for gain but also involves greater risk.

Foreign Investments. (applicable to each Fund except the Government Bond Fund)
Each Fund, except the Government Bond Fund, may invest all or a substantial part
of its portfolio in securities of companies that are located or primarily doing
business in a foreign country. A company is considered to be located in a
foreign country if it is organized under the laws of, or has a principal office
in, that country. A company is considered as primarily doing business in a
country if (i) the company derives at least 50% of its gross revenues or profits
from either goods or services produced or sold in the country or (ii) at least
50% of the company's assets are situated in the country. A Fund may invest in
foreign securities either directly or indirectly through the use of depositary
receipts, such as ADRs. Depositary receipts are generally issued by banks or
trust companies and evidence ownership of underlying foreign securities. An ADR
may be sponsored by the issuer of the underlying foreign security or it may be
issued in unsponsored form. The holder of a sponsored ADR is likely to receive
more frequent and extensive financial disclosure concerning the foreign issuer
than the holder of an unsponsored ADR and generally will bear lower transaction
charges. The Select International Equity Fund may also purchase foreign
securities through European Depositary Receipts and Global Depositary Receipts.

Lending of Securities. (applicable to all Funds) To realize additional income,
the Funds may lend portfolio securities to broker-dealer or financial
institutions in an amount up to 33 1/3% of a Fund's total assets. While any such
loan is outstanding, a Fund will continue to receive amounts equal to the
interest or dividends paid by the issuer on the securities, as well as interest
(less any rebates to be paid to the borrower) on the investment of the
collateral or a fee from the borrower. Each Fund will have the right to call
each loan and obtain the securities. Lending portfolio securities involves
possible delays in receiving additional collateral or in the recovery of the
securities or possible loss of rights in the collateral.


- -----------------------------
Allmerica Investment Trust
                                                                              15
<PAGE>

Restricted Securities. (applicable to all Funds) The Funds may purchase
securities that are not registered under Federal securities law ("restricted
securities"), but can be offered and sold to certain "qualified institutional
buyers". Each Fund will not invest more than 15% (10% for the Money Market Fund)
of its net assets in restricted securities (and securities deemed to be
illiquid). These limits do not apply if the Board of Trustees determines that
the restricted securities are liquid. The Board of Trustees has adopted
guidelines and delegated to the Manager the daily function of determining and
monitoring the liquidity of restricted securities. The Board, however, retains
sufficient oversight and is ultimately responsible for the determinations. This
investment practice could increase the level of illiquidity in a Fund if buyers
lose interest in restricted securities. As a result, a Fund might not be able to
sell these securities when its Sub-Adviser wants to sell, or might have to sell
them at less than fair value. In addition, market quotations for these
securities are less readily available.

Temporary Defensive Strategies. At times a Sub-Adviser may determine that market
conditions make it desirable temporarily to suspend a Fund's normal investment
activities. This is when the Fund may temporarily invest in a variety of
lower-risk securities, such as U.S. Government and other high quality bonds and
short-term debt obligations. Such strategies attempt to reduce changes in the
value of the Fund's shares. The Fund may not achieve its investment objective
while these strategies are in effect.

Frequent Trading. Certain Funds from time to time may engage in active and
frequent trading to achieve their investment objective. Frequent trading
increases transaction costs, which could detract from the Fund's performance.


                                                   -----------------------------
                                                     Allmerica Investment Trust
16
<PAGE>

                        [GRAPHIC] Management of the Funds
                        ---------------------------------

The Trust is governed by a Board of Trustees. Allmerica Financial Investment
Management Services, Inc. is the investment Manager of the Trust responsible for
managing the Trust's day-to-day business affairs. The Manager is located at 440
Lincoln Street, Worcester, MA 01653. The Manager and its predecessor, Allmerica
Investment Management Company, Inc., have been managing mutual funds since 1985.
The Manager currently serves as investment manager to one other mutual fund.
Sub-Advisers have been hired to manage the investments of the Funds. The Trust
and Manager have obtained an order of exemption from the SEC that permits the
Manager to enter into and materially amend sub-advisory agreements with
non-affiliated Sub-Advisers without obtaining shareholder approval. The Manager
has ultimate responsibility to oversee Sub-Advisers. The Manager has the
ability, subject to approval of the Trustees, to hire and terminate Sub-Advisers
and to change materially the terms of the Sub-Adviser Agreements, including the
compensation paid to the Sub-Advisers. The Sub-Advisers have been selected by
the Manager and Trustees with the help of BARRA RogersCasey, Inc., a pension
consulting firm. The fees earned by each Sub-Adviser and BARRA RogersCasey are
paid by the Manager. The performance by the Sub-Advisers is reviewed quarterly
by a committee of the Board of Trustees, with assistance from BARRA RogersCasey.

The following table provides information about each Fund's Sub-Adviser:

<TABLE>
<CAPTION>

           Fund Name,
   Sub-Adviser Name and Address                                              Experience
   ----------------------------                                              ----------
<S>                                                    <C>
Select Aggressive Growth Fund                          Has over $41 billion assets under management as of December
Nicholas-Applegate Capital Management, L.P.            31, 1999. Founded in 1984. Clients include employee benefit
600 West Broadway, Suite 2900                          and retirement plans, foundations, investment companies and
San Diego, CA 92101                                    individuals.

Select International Equity Fund                       Managed over $50 billion in global securities as of December
Bank of Ireland Asset Management (U.S.) Ltd.           31, 1999. Founded in 1966. Provides international investment
26 Fitzwilliam Place, Dublin 2,                        management services.
Ireland and 20 Horseneck Lane
Greenwich, CT 06830

Core Equity Fund                                       Organized in 1969, and is now a division of Morgan Stanley
Miller Anderson & Sherrerd, LLP                        Dean Witter Investment Management ("MSDWIM"). Provides
One Tower Bridge                                       investment advisory services to employee benefit plans, endowment funds,
West Conshohocken, PA 19428                            foundations and other institutional investors. MSDWIM had $184
                                                       billion in assets under management as of December 31, 1999.

</TABLE>

- -----------------------------
Allmerica Investment Trust
17
<PAGE>

<TABLE>
<CAPTION>

            Fund Name,
    Sub-Adviser Name and Address                       Experience
    ----------------------------                       ----------
<S>                                                    <C>
Equity Index Fund                                      Incorporated in 1993. Had $13.3 billion in assets under
Allmerica Asset Management, Inc.                       management as of December 31, 1999. Serves as investment
440 Lincoln Street                                     adviser to investment companies and affiliated insurance
Worcester, MA 01653                                    company accounts.

Select Investment Grade Income Fund                    See Equity Index Fund above
Allmerica Asset Management, Inc.
440 Lincoln Street
Worcester, MA 01653

Government Bond Fund                                   See Equity Index Fund above
Allmerica Asset Management, Inc.
440 Lincoln Street
Worcester, MA 01653

Money Market Fund                                      See Equity Index Fund above
Allmerica Asset Management, Inc.
440 Lincoln Street
Worcester, MA 01653
</TABLE>

For a sample listing of certain of the Sub-Advisers' clients, see "Investment
Management and Other Services" in the SAI.


                                                   -----------------------------
                                                     Allmerica Investment Trust
18
<PAGE>

The following individuals or groups of individuals are primarily responsible for
the day-to-day management of the Funds' portfolios:

<TABLE>
<CAPTION>

 Fund Name and                         Name and Title of               Service with            Business Experience
 Sub-Adviser Name                      Portfolio Manager(s)            Sub-Adviser             for Past Five Years
 ----------------                      --------------------            -----------             -------------------
<S>                                    <C>                             <C>                     <C>
Select Aggressive Growth Fund          Lawrence S. Speidell, Partner   1994 - Present          Director of Global/Systematic
Nicholas-Applegate Capital                                                                     Portfolio Management and
Management, L.P. ("NACM")                                                                      Research at NACM. Prior
                                                                                               to joining NACM, he spent
                                                                                               ten years with Batterymarch
                                                                                               Financial Management.

                                       John J. Kane, Partner           1994 - Present          Senior Portfolio Manager for the
                                                                                               U.S. Systematic portfolios at NACM.
                                                                                               Prior to joining NACM in 1994, he
                                                                                               was employed by ARCO Invest-
                                                                                               Management Company and General
                                                                                               Electric.

                                       Mark W. Stuckelman,             1995 - Present          Portfolio Manager for the
                                       Portfolio Manager                                       U.S. Systematic portfolios at NACM.
                                                                                               Prior to joining NACM, he was
                                                                                               employed for five years with Wells
                                                                                               Fargo Bank, Fidelity Management
                                                                                               Trust Co., and BARRA, Inc.

Select International Equity Fund       Christopher Reilly,            1980 - Present           Since 1985, he has had
   Bank of Ireland Asset Management    Chief Investment Officer                                overall responsibility for asset
   (U.S.) Limited ("BIAM")                                                                     management. He previously
                                                                                               worked in the United
                                                                                               Kingdom in stockbrokering
                                                                                               and investment management.

                                       Michael McCarthy,              1997 - Present           Mr. McCarthy rejoined BIAM
                                       Portfolio Manager                                       in 1997 from a major life assurance
                                                                                               Company where he was Head of
                                                                                               Asset Management. Prior to this, he
                                                                                               worked for BIAM in the U.K. in a
                                                                                               senior portfolio management capacity.



                                       Peter Wood, Senior             1985 - Present           Prior to 1985, he spent five
                                       Portfolio Manager                                       years with another leading
                                                                                               investment management firm.
                                                                                               He is now responsible for
                                                                                               portfolio construction at BIAM.

                                       Jane Neill, Senior             1994 - Present           Previously, she was Chief
                                       Equity Analyst                                          Investment Officer with
                                                                                               another leading Irish investment
                                                                                               management firm.

</TABLE>

- -----------------------------
Allmerica Investment Trust
                                                                              19
<PAGE>

<TABLE>
<CAPTION>

 Fund Name and                   Name and Title of             Service with             Business Experience
Sub-Adviser Name                 Portfolio Manager(s)          Sub-Adviser              for Past Five Years
- ----------------                 --------------------          -----------              -------------------
<S>                              <C>                           <C>                      <C>
Core Equity Fund                 Gary G. Schlarbaum,           1987 - Present           He has served on a committee
Miller Anderson & Sherrerd, LLP  CFA and Managing Director                              of fund managers since 1993.
("MAS")                                                                                 Prior to 1987, Mr. Schlarbaum was
                                                                                        employed by First Chicago
                                                                                        Investment Advisors from 1984 -
                                                                                        1987.

                                 Robert J. Marcin,             1988 - Present           Prior to joining MAS in 1988,
                                 CFA and Managing Director                              Mr. Marcin was an Account
                                                                                        Executive at Smith Barney Harris
                                                                                        Upham and Company, Inc.

                                 Brian Kramp,                  1997 - Present           Mr. Kramp was employed
                                 CFA and Vice President                                 as an analyst and portfolio
                                                                                        manager by Meridian Investment
                                                                                        Company from 1985 - 1997.

                                 James J. Jolinger, Principal  1994 - Present           He has served on the fund
                                                                                        managers committee since 1997.
                                                                                        Prior to 1994, Mr. Jolinger was
                                                                                        employed by Oppenheimer Capital as
                                                                                        an Equity Analyst from 1987 to
                                                                                        1994.

                                 Arden C. Armstrong,           1986 - Present           Prior to joining MAS,
                                 CFA and Managing Director                              Ms. Armstrong was employed
                                                                                        by Evans Economics, Inc.

                                 Chris Leavy,                  1997 - Present           Prior to joining MAS, Mr. Leavy
                                 CFA and Vice President                                 was employed by Capitoline
                                                                                        Investment Services as a portfolio
                                                                                        Manager from 1995-1997.

                                 Steven Epstein,               1996 - Present           Prior to joining MAS, Mr. Epstein
                                 Vice President                                         attended the Wharton School,
                                                                                        University of Pennsylvania from
                                                                                        1994-1996, receiving an MBA.

                                 Eric F. Scharpf,              1997 - Present           Prior to joining MAS, Mr. Scharpf
                                 Vice President                                         attended the Whartonm School,
                                                                                        University of Pennsylvania from
                                                                                        1995-1997 receiving an MBA, and
                                                                                        served as a Financial Analyst for
                                                                                        Salomon Brothers from 1993-1995.

Select Investment Grade Income   Ann K. Tripp,                 1987 - Present           She was a Portfolio Manager
 Fund Allmerica Asset            Vice President                                         for AAM prior to becoming a
 Management, Inc. ("AAM")                                                               Vice President.

Government Bond Fund             Richard J. Litchfield,        1995 - Present           He was a mortgage-backed
Allmerica Asset Management, Inc. CFA and Vice President                                 securities analyst and trader
("AAM")                                                                                 at Keystone Investments, Inc.
                                                                                        prior to joining AAM.

Equity Index Fund and            John C. Donohue,              1995 - Present           He was a portfolio manager
Money Market Fund                Vice President                                         at CS First Boston Investment
Allmerica Asset Management, Inc.                                                        Management prior to joining
("AAM")                                                                                 AAM.

</TABLE>
                                                  -----------------------------
                                                    Allmerica Investment Trust
20
<PAGE>


For the fiscal year ended December 31, 1999, the Funds paid the Manager the fees
shown in the table below:

<TABLE>
<CAPTION>
                                                                      Fee (as a percentage of
Fund                                                                    average net assets)
- ----                                                                    -------------------
<S>                                                                     <C>
Select Aggressive Growth Fund                                                   0.85%
- -----------------------------                                                   -----

Select International Equity Fund                                                0.89%
- --------------------------------                                                -----

Core Equity Fund                                                                0.43%
- ----------------                                                                -----

Equity Index Fund                                                               0.28%
- -----------------                                                               -----

Investment Grade Income Fund (renamed the
Select Investment Grade Income Fund)                                            0.43%
- -----------------------------------------                                       -----

Government Bond Fund                                                            0.50%
- --------------------                                                            -----

Money Market Fund                                                               0.24%
- -----------------                                                               -----
</TABLE>

For the fiscal year ended December 31, 1999, the Manager paid each Sub-Adviser
aggregate fees as set forth below:

<TABLE>
<CAPTION>
                                                                                                  Fee (as a percentage of
Sub-Adviser                                                                                         average net assets)
- -----------                                                                                         -------------------
<S>                                                                                               <C>
Nicholas-Applegate Capital Management, L.P. (Select Aggressive Growth Fund)                                0.48%
- ---------------------------------------------------------------------------                                -----

Bank of Ireland Asset Management (U.S.) Limited (Select International Equity Fund)                         0.30%
- ----------------------------------------------------------------------------------                         -----

Miller Anderson & Sherrerd, LLP (Core Equity Fund)                                                         0.21%
- --------------------------------------------------                                                         -----

Allmerica Asset Management, Inc. (Equity Index Fund)                                                       0.09%
- ----------------------------------------------------                                                       -----

Allmerica Asset Management, Inc. (Investment Grade Income Fund - renamed
the Select Investment Grade Income Fund)                                                                   0.20%
- ------------------------------------------------------------------------                                   -----

Allmerica Asset Management, Inc. (Government Bond Fund)                                                    0.18%
- -------------------------------------------------------                                                    -----

Allmerica Asset Management, Inc. (Money Market Fund)                                                       0.09%
- ----------------------------------------------------                                                       -----
</TABLE>

- -----------------------------
Allmerica Investment Trust
                                                                              21
<PAGE>

                             Pricing of Fund Shares
                             ----------------------

The Funds sell and redeem their shares at a price equal to their net asset value
("NAV") without paying any sales or redemption charges. The NAV of a share is
computed by adding the current value of all the Fund's assets, subtracting its
liabilities and dividing by the number of its outstanding shares. NAV is
computed once daily at the close of regular trading on the New York Stock
Exchange each day the Exchange is open - normally 4:00 p.m. Eastern Time. Orders
for the purchase or redemption of shares are filled at the next NAV computed
after an order is received by the Fund. The Funds do not accept orders or
compute their NAV's on days when the Exchange is closed.

Equity securities are valued based on market value if market quotations are
readily available. Debt securities (other than short-term obligations) normally
are valued based on pricing service valuations. All securities of the Money
Market Fund are valued at amortized cost. Debt obligations in the other Funds
with a remaining maturity of 60 days or less are valued at amortized cost when
amortized cost is considered to represent fair value. Values for short-term
obligations of the other Funds having a remaining maturity of more than 60 days
are based upon readily available market quotations. In other cases, debt and
equity securities and any other assets are valued at their fair value following
procedures approved by the Trustees.

Certain foreign markets may be open on days when the Funds do not accept orders
or price their shares. As a result, the NAV of a Fund's shares may change on
days when shareholders will not be able to buy or sell shares.


                        Purchase and Redemption of Shares
                        ---------------------------------

Shares of the Funds currently are purchased only by Separate Accounts which are
the funding mechanisms for variable annuity contracts and variable life
insurance policies. The Distributor, Allmerica Investments, Inc., at its
expense, may provide promotional incentives to dealers who sell variable annuity
contracts which invest in the Funds. The Trust has obtained an exemptive order
from the Securities and Exchange Commission to permit Fund shares to be sold to
variable annuity and variable life insurance separate accounts of both
affiliated and unaffiliated life insurance companies and certain qualified
pension and retirement plans. Material irreconcilable conflicts may arise among
various insurance policy owners and plan participants. The Trustees will monitor
events to identify any material conflicts and determine if any action should be
taken to resolve such conflict.

No fee is charged by the Trust on redemption. The variable contracts funded
through the Separate Accounts are sold subject to certain fees and charges which
may include sales and redemption charges. See the prospectuses for the variable
insurance products.

Normally, redemption payments will be made within seven days after the Trust
receives a written redemption request. Redemptions may be suspended when trading
on the New York Stock Exchange is restricted or when permitted by the Securities
and Exchange Commission.


                                                    ----------------------------
                                                      Allmerica Investment Trust

22
<PAGE>

                             Distributions and Taxes
                             -----------------------

Distributions

Each Fund pays out substantially all of its net investment income and net
capital gains to shareholders each year. Net investment income is paid quarterly
in the case of the Growth Fund, Equity Index Fund, Investment Grade Income Fund
and Government Bond Fund; annually in the case of the Select Aggressive Growth
Fund and Select International Equity Fund; and daily in the case of the Money
Market Fund. Distributions of net capital gains for the year, if any, are made
annually. All dividends and capital gain distributions are applied to purchase
additional Fund shares at net asset value as of the payment date. Fund shares
are held by the Separate Accounts and any distributions are reinvested
automatically by the Separate Accounts.

Taxes

The Trust seeks to comply with the provisions of the Internal Revenue Code
applicable to regulated investment companies so that the Trust will not be
subject to federal income tax. Under current tax law, dividend or capital gain
distributions from any Fund are not currently taxable when left to accumulate
within a variable annuity or variable life insurance contract. Withdrawals from
a contract generally are subject to ordinary income tax and, in many cases, to
an additional 10% penalty tax on withdrawals before age 59 1/2. Tax consequences
to investors in the Separate Accounts which are invested in the Trust are
described in more detail in the prospectuses for those accounts.



                          Allmerica Investment Trust 23
<PAGE>

                       This page left blank intentionally.


                                                    ----------------------------
                                                      Allmerica Investment Trust
24
<PAGE>

                         [GRAPHIC] Financial Highlights


                           Allmerica Investment Trust

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                       Income from Investment Operations                             Less Distributions
                 --------------------------------------------- -----------------------------------------------------------------
                                       Net Realized
                    Net                    and                            Distributions
                   Asset       Net      Unrealized             Dividends    from Net
                   Value   Investment  Gain (Loss)  Total from  from Net    Realized    Distributions
   Year Ended    Beginning   Income         on      Investment Investment    Capital         in          Return of     Total
  December 31,    of Year  (Loss)(/1/) Investments  Operations   Income       Gains        Excess         Capital  Distributions
  ------------   --------- ----------- ------------ ---------- ---------- ------------- -------------    --------- -------------
<S>              <C>       <C>         <C>          <C>        <C>        <C>           <C>              <C>       <C>
     Select
   Aggressive
  Growth Fund
      1999         2.460     (0.012)      0.963       0.951          --          --            --            --           --
      1998         2.225     (0.008)      0.243       0.235          --          --            --            --           --
      1997         2.037     (0.009)      0.387       0.378          --      (0.182)       (0.008)(/2/)      --       (0.190)
      1996         1.848     (0.009)      0.351       0.342          --      (0.153)           --            --       (0.153)
      1995         1.397     (0.001)      0.452       0.451          --          --            --            --           --
     Select
 International
  Equity Fund
      1999         1.542      0.012       0.477       0.489          --          --            --            --           --
      1998         1.341      0.014       0.207       0.221      (0.020)         --            --            --       (0.020)
      1997         1.356      0.015       0.049       0.064      (0.019)     (0.046)       (0.014)(/3/)      --       (0.079)
      1996         1.136      0.011       0.238       0.249      (0.012)     (0.003)       (0.014)(/3/)      --       (0.029)
      1995         0.963      0.013       0.176       0.189      (0.011)     (0.005)           --            --       (0.016)
<CAPTION>
                    Net
                  Increase
                 (Decrease)
                     in
   Year Ended    Net Asset
  December 31,     Value
  ------------   ----------
<S>              <C>
     Select
   Aggressive
  Growth Fund
      1999          0.951
      1998          0.235
      1997          0.188
      1996          0.189
      1995          0.451
     Select
 International
  Equity Fund
      1999          0.489
      1998          0.201
      1997         (0.015)
      1996          0.220
      1995          0.173
</TABLE>
- ------------------
(A) Including reimbursements, waivers, and reductions.
(B) Excluding reductions. Certain Portfolios have entered into varying arrange-
    ments with brokers who reduced a portion of the Portfolio's expenses.
(C) Excluding reimbursements and reductions.
(1) Net investment income (loss) per share before reimbursement of fees by the
    investment adviser or reductions were $(0.013) in 1999, $(0.009) in 1998
    and $(0.010) in 1997 for Select Aggressive Growth Fund; and $0.011 in 1999,
    $0.014 in 1998, $0.015 in 1997 and $0.011 in 1996 for Select International
    Equity Fund.
(2) Distributions in excess of net realized capital gains.
(3) Distributions in excess of net investment income.



                           Allmerica Investment Trust

                            Ratios/Supplemental Data
        -----------------------------------------------------
                          Ratios To Average Net Assets
               ----------------------------------------

<TABLE>
<CAPTION>
Net Asset          Net Assets
  Value              End of        Net                                                 Portfolio
 End of    Total     Period    Investment    Operating Expenses     Management Fee     Turnover
 Period    Return   (000's)   Income (Loss)  (A)     (B)     (C)     Gross     Net       Rate
- ---------  ------  ---------- ------------- ------  ------  ------  --------  -------  ---------
<S>        <C>     <C>        <C>           <C>     <C>     <C>     <C>       <C>      <C>
  3.411    38.66%   1,015,699     (0.46)%     0.88%   0.91%   0.91%    0.85%     0.85%    101%
  2.460    10.56%     752,741     (0.36)%     0.92%   0.95%   0.95%    0.88%     0.88%     99%
  2.225    18.71%     604,123     (0.45)%     0.99%   1.04%   1.04%    0.95%     0.95%     95%
  2.037    18.55%     407,442     (0.53)%     1.08%   1.08%   1.08%    1.00%     1.00%    113%
  1.848    32.28%     254,872     (0.07)%     1.09%     --    1.09%    1.00%     1.00%    104%
  2.031    31.71%     679,341      0.69%      1.01%   1.02%   1.02%    0.89%     0.89%     18%
  1.542    16.48%     505,553      0.99%      1.01%   1.02%   1.02%    0.90%     0.90%     27%
  1.341     4.65%     397,915      1.17%      1.15%   1.17%   1.17%    0.97%     0.97%     20%
  1.356    21.94%     246,877      1.22%      1.20%   1.23%   1.23%    1.00%     1.00%     18%
  1.136    19.63%     104,312      1.68%      1.24%     --    1.24%    1.00%     1.00%     24%
</TABLE>



                           Allmerica Investment Trust

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                          Income from Investment Operations                            Less Distributions
                    --------------------------------------------- ----------------------------------------------------------------
                                          Net Realized
                       Net                    and
                      Asset       Net      Unrealized             Dividends  Distributions
                      Value   Investment  Gain (Loss)  Total from  from Net    from Net    Distributions    Return
    Year Ended      Beginning   Income         on      Investment Investment   Realized         in            of         Total
   December 31,     of Period (Loss)(/2/) Investments  Operations   Income   Capital Gains    Excess        Capital  Distributions
 -----------------  --------- ----------- ------------ ---------- ---------- ------------- -------------    -------  -------------
 <S>                <C>       <C>         <C>          <C>        <C>        <C>           <C>              <C>      <C>
 Growth Fund(/1/)
       1999           2.825      0.020       0.779       0.799      (0.020)     (0.294)            --            --     (0.314)
       1998           2.416      0.028       0.436       0.464      (0.028)     (0.027)            --            --     (0.055)
       1997           2.333      0.039       0.540       0.579      (0.038)     (0.458)            --            --     (0.496)
       1996           2.176      0.047       0.386       0.433      (0.048)     (0.228)            --            --     (0.276)
       1995           1.814      0.049       0.539       0.588      (0.049)     (0.177)            --            --     (0.226)
 Equity Index Fund
       1999           3.408      0.036       0.656       0.692      (0.035)     (0.005)            --            --     (0.040)
       1998           2.753      0.035       0.741       0.776      (0.034)     (0.087)            --            --     (0.121)
       1997           2.165      0.034       0.664       0.698      (0.033)     (0.077)            --            --     (0.110)
       1996           1.827      0.035       0.370       0.405      (0.035)     (0.032)            --            --     (0.067)
       1995           1.468      0.035       0.474       0.509      (0.035)     (0.047)        (0.002)(/3/)  (0.066)    (0.150)
<CAPTION>
                       Net
                     Increase
                    (Decrease)
                        in
    Year Ended      Net Asset
   December 31,       Value
- ------------------- ----------
 <S>                <C>
 Growth Fund(/1/)
       1999           0.485
       1998           0.409
       1997           0.083
       1996           0.157
       1995           0.362
 Equity Index Fund
       1999           0.652
       1998           0.655
       1997           0.588
       1996           0.338
       1995           0.359
</TABLE>
- ------------------------------------
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.
(1)  Effective May 1, 2000, the name of the Growth Fund was changed to the Core
     Equity Fund.
(2)  Net investment income (loss) per share before reimbursement of fees by the
     investment adviser or reductions were $0.019 in 1999, $0.027 in 1998,
     $0.038 in 1997 and $0.046 in 1996 for Growth Fund.
(3)  Distributions in excess of net realized capital gains.



                           Allmerica Investment Trust

<TABLE>
<CAPTION>
                            Ratios/Supplemental Data
           --------------------------------------------------------------
                           Ratios To Average Net Assets
                   ------------------------------------------------
                   Net Assets
Net Asset            End of        Net        Operating       Management   Portfolio
Value End   Total    Period    Investment      Expenses          Fee       Turnover
of Period  Returns  (000's)   Income (Loss) (A)   (B)   (C)   Gross  Net     Rate
- ---------  ------- ---------- ------------- ----  ----  ----  -----  ----  ---------
<S>        <C>     <C>        <C>           <C>   <C>   <C>   <C>    <C>   <C>
  3.310     29.33% 1,076,297      0.65%     0.45% 0.48% 0.48% 0.43%  0.43%    116%
  2.825     19.32%   860,333      1.08%     0.46% 0.49% 0.49% 0.44%  0.44%    100%
  2.416     25.14%   728,679      1.48%     0.47% 0.49% 0.49% 0.43%  0.43%     79%
  2.333     20.19%   556,751      2.04%     0.48% 0.51% 0.51% 0.44%  0.44%     72%
  2.176     32.80%   444,871      2.34%     0.54%   --  0.54% 0.46%  0.46%     64%
  4.060     20.41%   638,230      0.98%     0.35% 0.35% 0.35% 0.28%  0.28%     21%
  3.408     28.33%   481,877      1.17%     0.36% 0.36% 0.36% 0.29%  0.29%      6%
  2.753     32.41%   297,191      1.38%     0.44% 0.44% 0.44% 0.31%  0.31%      9%
  2.165     22.30%   151,130      1.79%     0.46% 0.46% 0.46% 0.32%  0.32%     12%
  1.827     36.18%    90,889      1.96%     0.55%   --  0.55% 0.34%  0.34%      8%
</TABLE>



                           Allmerica Investment Trust

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                              Income from Investment Operations                             Less Distributions
                  --------------------------------------------------------- ------------------------------------------------------
                                         Net Realized
                     Net                     and                            Distributions
                    Asset       Net       Unrealized             Dividends    from Net
                    Value    Investment  Gain (Loss)  Total from  from Net    Realized    Distributions
   Year Ended     Beginning    Income         on      Investment Investment    Capital         in          Return of     Total
  December 31,     of Year     (Loss)    Investments  Operations   Income       Gains        Excess         Capital  Distributions
  ------------    --------- ------------ ------------ ---------- ---------- ------------- -------------    --------- -------------
<S>               <C>       <C>          <C>          <C>        <C>        <C>           <C>              <C>       <C>
Investment Grade
Income Fund(1)
      1999          1.132      0.068        (0.079)     (0.011)    (0.069)      (0.001)          --            --       (0.070)
      1998          1.112      0.067         0.020       0.087     (0.067)          --           --            --       (0.067)
      1997          1.084      0.071         0.028       0.099     (0.071)          --           --            --       (0.071)
      1996          1.117      0.070        (0.033)      0.037     (0.070)          --           --            --       (0.070)
      1995          1.012      0.071         0.106       0.177     (0.071)          --       (0.001)(2)        --       (0.072)
   Government
   Bond Fund
      1999          1.068      0.058        (0.056)      0.002     (0.059)          --           --            --       (0.059)
      1998          1.047      0.058         0.021       0.079     (0.058)          --           --            --       (0.058)
      1997          1.036      0.061         0.011       0.072     (0.061)          --           --            --       (0.061)
      1996          1.062      0.062        (0.026)      0.036     (0.062)          --           --            --       (0.062)
      1995          0.997      0.062         0.066       0.128     (0.062)          --       (0.001)(2)        --       (0.063)
  Money Market
      Fund
      1999          1.000      0.051            --       0.051     (0.051)          --           --            --       (0.051)
      1998          1.000      0.054            --       0.054     (0.054)          --           --            --       (0.054)
      1997          1.000      0.053            --       0.053     (0.053)          --           --            --       (0.053)
      1996          1.000      0.052            --       0.052     (0.052)          --           --            --       (0.052)
      1995          1.000      0.057            --       0.057     (0.057)          --           --            --       (0.057)
<CAPTION>
                     Net
                   Increase
                  (Decrease)
                      in
   Year Ended     Net Asset
  December 31,      Value
  ------------    ----------
<S>               <C>
Investment Grade
Income Fund(/2/)
      1999          (0.081)
      1998           0.020
      1997           0.028
      1996          (0.033)
      1995           0.105
   Government
   Bond Fund
      1999          (0.057)
      1998           0.021
      1997           0.011
      1996          (0.026)
      1995           0.065
  Money Market
      Fund
      1999              --
      1998              --
      1997              --
      1996              --
      1995              --
</TABLE>
- ------------------------------------
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.
(1)  Effective May 1, 2000, the name of the Investment Grade Income Fund was
     changed to the Select Investment Grade Income Fund.
(2)  Distributions in excess of net investment income.


                           Allmerica Investment Trust

<TABLE>
<CAPTION>
                           Ratios/Supplemental Data
           ---------------------------------------------------------------
                            Ratios To Average Net Assets
                    ------------------------------------------------
                    Net Assets
Net Asset             End of        Net        Operating       Management   Portfolio
Value End  Total       Year     Investment      Expenses          Fee       Turnover
 of Year   Return    (000's)   Income (Loss) (A)   (B)   (C)   Gross  Net     Rate
- ---------  ------   ---------- ------------- ----  ----  ----  -----  ----  ---------
<S>        <C>      <C>        <C>           <C>   <C>   <C>   <C>    <C>   <C>
  1.051    (0.97)%   240,541       6.22%     0.50% 0.50% 0.50% 0.43%  0.43%     75%
  1.132     7.97%    230,623       6.01%     0.52% 0.52% 0.52% 0.43%  0.43%    158%
  1.112     9.45%    189,503       6.48%     0.51% 0.51% 0.51% 0.41%  0.41%     48%
  1.084     3.56%    157,327       6.50%     0.52% 0.52% 0.52% 0.40%  0.40%    108%
  1.117    17.84%    141,625       6.66%     0.53%   --  0.53% 0.41%  0.41%    126%
  1.011     0.23%     87,247       5.64%     0.62% 0.62% 0.62% 0.50%  0.50%     37%
  1.068     7.67%     81,018       5.63%     0.64% 0.64% 0.64% 0.50%  0.50%     61%
  1.047     7.08%     55,513       5.92%     0.67% 0.67% 0.67% 0.50%  0.50%     56%
  1.036     3.51%     46,396       5.90%     0.66% 0.66% 0.66% 0.50%  0.50%    112%
  1.062    13.06%     45,778       5.91%     0.69%   --  0.69% 0.50%  0.50%    180%
  1.000     5.19%    513,606       5.09%     0.29% 0.29% 0.29% 0.24%  0.24%    N/A
  1.000     5.51%    336,253       5.36%     0.32% 0.32% 0.32% 0.26%  0.26%    N/A
  1.000     5.47%    260,620       5.33%     0.35% 0.35% 0.35% 0.27%  0.27%    N/A
  1.000     5.36%    217,256       5.22%     0.34% 0.34% 0.34% 0.28%  0.28%    N/A
  1.000     5.84%    155,211       5.68%     0.36%   --  0.36% 0.29%  0.29%    N/A
</TABLE>



The financial highlights tables are intended to help you understand each Fund's
financial performance for the past five years (or, if shorter, the period of the
Fund's operations). Certain information reflects financial results for a single
Fund share. The total returns in the tables represent the rate that an investor
would have earned or lost on an investment in a Fund (assuming reinvestment of
all dividends and distributions). This information has been audited by
PricewaterhouseCoopers LLP, whose report, along with each Fund's financial
statements, are included in the Statement of Additional Information or annual
report, which is available upon request.


- -----------------------------
Allmerica Investment Trust
                                                                              25

<PAGE>

Appendix

[GRAPHIC]

Investment Techniques and Strategies
In managing its portfolios of investments, the Trust may make use of the
following investment techniques and strategies:

Symbols

   o    Permitted
   -- Not Permitted

<TABLE>
<CAPTION>
                                                                                           Select
                                            Select       Select                          Investment
                                          Aggressive  International   Core      Equity     Grade       Government    Money
                                            Growth       Equity      Equity     Index      Income         Bond       Market
Investment Technique/Strategy               Fund         Fund         Fund       Fund       Fund          Fund        Fund
- -----------------------------               ----         ----         ----       ----       ----          ----        ----
<S>                                       <C>         <C>            <C>        <C>      <C>           <C>           <C>
Asset-Backed Securities                      --           --           o          --          o             o           o
Financial Futures Contracts
      and Related Options                     o            o           o           o          o             o          --
Foreign Securities                            o            o           o           o          o            --           o
Forward Commitments                          --           --          --          --          o             o           o
Forward Contracts on Foreign
  Currencies                                 --            o          --          --         --            --          --
High Yield Securities                        --           --          --          --         --            --          --
Investments in Money Market
  Securities                                  o            o           o           o          o             o           o
Mortgage-Backed Securities                   --           --          --          --          o             o          --
Purchasing Options                            o            o           o           o          o             o          --
Repurchase Agreements                         o            o           o           o          o             o           o
Restricted Securities                         o            o           o           o          o             o           o
Reverse Repurchase Agreements                --           --          --          --         --            --          --
Securities Lending                            o            o           o           o          o             o           o
Stand-By Commitments                         --           --          --          --          o             o           o
Stripped Mortgage-Backed
  Securities                                 --           --          --          --          o             o          --
Swap and Swap-Related Products               --           --          --          --         --            --          --
When-Issued Securities                        o            o           o           o          o             o           o
Writing Covered Options                       o            o           o           o          o             o          --
- -----------------------                       -            -           -           -          -             -
</TABLE>

- -----------------------------
Allmerica Investment Trust
                                                                              26
<PAGE>

                          Allmerica Investment Trust

                         Select Aggressive Growth Fund
                       Select International Equity Fund

                               Core Equity Fund
                               Equity Index Fund

                      Select Investment Grade Income Fund
                             Government Bond Fund
                               Money Market Fund

The Trust's Statement of Additional Information ("SAI") includes additional
information about the Funds. The Trust's annual and semi-annual reports to
shareholders include information about the investments of the Funds. The SAI and
the financial statements included in the Fund's most recent annual report to
shareholders are incorporated by reference into this prospectus, which means
they are part of this prospectus for legal purposes. The Trust's annual report
discusses the market conditions and investment strategies that significantly
affected each Fund's performance during its last fiscal year. You may get free
copies of these materials, request other information about a Fund or make
shareholder inquiries by calling 1-800-828-0540.

You may review and copy information about the Trust, including its SAI, at the
Securities and Exchange Commission's Public Reference Room in Washington, D.C.
You may call the Commission at 1-800-SEC-0330 for information about the
operation of the Public Reference Room. You may also access reports and other
information about the Trust on the Commission's Internet site at
http://www.sec.gov. You may get copies of this information, with payment of a
duplication fee, by writing the Public Reference Section of the Commission,
Washington, D.C. 20549-6009. You may need to refer to the Trust's file number
under the Investment Company Act, which is 811-4138.

                                   ALLMERICA
                                  INVESTMENT
                                     TRUST

              440 Lincoln Street, Worcester, Massachusetts 01653
                                1-800-828-0540
<PAGE>


Allmerica Investment Trust

                                                                     Prospectus
                                                                     May 1, 2000


The Select Income Fund is a separate portfolio of the Trust which serves as the
underlying investment for insurance related accounts.

This Prospectus explains what you should know about the Fund. Please read it
carefully before you invest.

On or about July 1, 2000, subject to regulatory approval, shares of the Select
Investment Grade Income Fund of the Trust will be substituted for shares of the
Select Income Fund. As of the substitution date, shares of the Select Investment
Grade Income Fund will be available and shares of the Select Income Fund will no
longer be offered.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined that
this Prospectus is adequate or complete. Any representation to the contrary is a
criminal offense.




                                                                ALLMERICA
                                                               INVESTMENT
                                                                  TRUST

                                                           440 Lincoln Street
                                                        Worcester, Massachusetts
                                                                  01653
                                                             1-800-828-0540
<PAGE>

<TABLE>
<CAPTION>

                                Table of Contents
<S>                                                                      <C>
FUND SUMMARIES........................................................   3

        Objectives, Strategies and Risks..............................   4

EXPENSE SUMMARY.......................................................   5

DESCRIPTION OF PRINCIPAL INVESTMENT RISKS.............................   6

OTHER INVESTMENT STRATEGIES...........................................   7

MANAGEMENT OF THE FUND................................................   9

PRICING OF FUND SHARES................................................  10

PURCHASE AND REDEMPTION OF SHARES.....................................  10

DISTRIBUTIONS AND TAXES...............................................  11

FINANCIAL HIGHLIGHTS..................................................  12

APPENDIX..............................................................  13

<CAPTION>
                                     LEGEND
<S>                                 <C>
Performance                         [GRAPHIC APPEARS HERE]

Investment Objectives               [GRAPHIC APPEARS HERE]

Financial Information               [GRAPHIC APPEARS HERE]

Management of Fund                  [GRAPHIC APPEARS HERE]

Risk                                [GRAPHIC APPEARS HERE]

Investment Strategies               [GRAPHIC APPEARS HERE]


                                                   -----------------------------
                                                   Allmerica Investment Trust
</TABLE>


2
<PAGE>


                               Fund Summary

This Prospectus describes the Select Income Fund of Allmerica Investment Trust,
which provides a broad range of investment options through 14 separate
investment portfolios, or Funds. The other Funds are described in separate
prospectuses. Shares of the Fund are sold exclusively to variable annuity and
variable life insurance Separate Accounts and qualified pension and retirement
plans.

The investment manager of the Trust is Allmerica Financial Investment Management
Services, Inc. The Manager is responsible for managing the Trust's daily
business and has general responsibility for the management of the investments of
the Fund. The Manager, at its expense, has contracted with Standish, Ayer &
Wood, Inc. ("SAW") to manage the investments of the Select Income Fund. SAW has
been selected on the basis of various factors including management experience,
investment techniques and staffing. See "Management of the Fund" for more
information about the Manager and the Sub-Adviser.

The following summary describes the Select Income Fund's investment objective
and principal investment strategies, identifies the principal investment risks
of investing in the Fund and provides a performance chart for the Fund. Note
that any percentage limitations listed under the Fund's principal investment
strategies apply at the time of investment. The principal risks are discussed in
more detail under "Description of Principal Investment Risks". The bar chart
shows how the investment returns of the shares of the Fund have varied for the
life of the Fund. The table following the bar chart shows how the Fund's average
annual returns for the last one and five years and for the life of the Fund
compare to those of a broad-based securities market index. Past performance does
not necessarily indicate how the Fund will perform in the future. The bar chart
and table give some indication of the risks of investing in the Fund by showing
changes in the Fund's performance. The bar chart and table do not reflect
expenses associated with the variable insurance product that you are purchasing.
If those expenses had been reflected, the performance shown would have been
lower.


- -----------------------------
Allmerica Investment Trust

                                                                               3
<PAGE>


Objectives, Strategies and Risks


                                                Select Income Fund

[GRAPHIC APPEARS HERE]  Sub-Adviser: Standish, Ayer & Wood, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks a high level of
                        current income. The Fund will invest primarily in
                        investment grade, fixed-income securities.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: Examples of the types
                        of securities in which the Fund invests are corporate
                        debt obligations such as bonds, notes and debentures,
                        and obligations convertible into common stock;
                        commercial paper; obligations issued or guaranteed by
                        the U.S. Government, its agencies or instrumentalities;
                        and debt securities backed by various types of financial
                        assets. The Fund also may invest in mortgage-backed and
                        asset-backed securities. The Fund's investments in
                        corporate debt securities are not limited to any
                        particular type of company or industry. The Fund may
                        invest up to 25% of its assets in foreign securities
                        (not including its investments in American Depositary
                        Receipts or "ADRs"), up to 35% of its assets in money
                        market instruments and up to 25% in debt obligations of
                        supranational entities.

                        The average maturity and the mix of portfolio securities
                        will vary depending on such factors as current market
                        conditions and the comparative yields from different
                        instruments. The Fund invests primarily in investment
                        grade securities rated in the four highest grades by
                        Moody's Investors Services or Standard & Poor's Rating
                        Services or similar rating organizations, and in unrated
                        securities. For more information about rating
                        categories, see the Appendix to the Statement of
                        Additional Information ("SAI"). The Fund also may invest
                        up to 25% of its assets in "junk bonds."

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Credit Risk

                        .  Interest Rate Risk

                        .  Investment Management Risk

                        .  Liquidity Risk

                        .  Market Risk

                        .  Prepayment Risk

See "Description of Principal Investment Risks."


The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                 1993...............................  10.95%
                 1994...............................  -4.82%
                 1995...............................  16.96%
                 1996...............................   3.32%
                 1997...............................   9.17%
                 1998...............................   6.83%
                 1999...............................  -0.85%


During the period shown above the highest quarterly return was 5.64% for the
quarter ended 6/30/95 and the lowest was (3.87)% for the quarter ended 3/31/94.


Performance Table

Average Annual Total Returns
(for the periods ending               Past        Past         Since Inception
December 31, 1999)                  One Year    Five Years    (August 21, 1992)
- ------------------                  --------    ----------    -----------------

Fund Shares                           -0.85%         6.92%                5.52%
- -----------                           ------         -----                -----

Lehman Brothers
Aggregate Bond Index*                 -0.83%         7.73%                6.24%
- ---------------------                 ------         -----                -----

* The Lehman Brothers Aggregate Bond Index(R) is an unmanaged index of fixed
rate debt issues with an investment grade or higher rating at least one year to
maturity and an outstanding par value of at least $25 million.


                                                   -----------------------------
                                                   Allmerica Investment Trust


4
<PAGE>


                                 Expense Summary

Expenses are one of several factors to consider when investing in the Select
Income Fund. Expenses shown are based on expenses incurred in respect of shares
of the Fund for the 1999 fiscal year. The Example shows the cumulative expenses
attributable to a hypothetical $10,000 investment in the Fund over specified
periods.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you invest in the
Fund. Please note that the expenses listed below do not include the expenses of
the applicable variable insurance product that you are purchasing. You should
refer to the variable insurance product prospectus for more information relating
to the fees and expenses of that product, which are in addition to the expenses
of the Fund.

                            Annual Fund Operating Expenses
     Shareholder          (expenses deducted from Fund assets)      Total Annual
        Fees                                                            Fund
(fees paid directly      Management    Distribution      Other       Operating
from your investment)       Fees       (12b-1) Fees     Expenses     Expenses
- ---------------------       ----       ------------     --------     --------

        None               0.52%           None          0.09%        0.61%(1)


(1)  Through December 31, 2000, the Manager has declared a voluntary expense
     limitation of 1.00% for the Select Income Fund. The total operating
     expenses of the Fund were less than its expense limitation throughout
     1999.


     The declaration of a voluntary management fee or expense limitation in any
     year does not bind the Manager to declare future expense limitations with
     respect to these Funds. These limitations may be terminated at any time.


Example

This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. The
Example also assumes that your investment earns a 5% return each year and that
the Fund's operating expenses remain the same. Although your actual costs may be
higher or lower, based on these assumptions your costs would be:

              1 Year       3 Years        5 Years      10 Years
              ------       -------        -------      --------


               $63          $196            $341         $764


- -----------------------------
Allmerica Investment Trust


                                                                               5
<PAGE>


               [GRAPHIC] Description of Principal Investment Risks

The following is a summary of the principal risks of investing in the Select
Income Fund and the factors likely to cause the value of your investment in the
Fund to decline. The principal risks applicable to the Fund are identified under
"Fund Summary". There are also many factors that could cause the value of your
investment in the Fund to decline which are not described here. It is important
to remember that there is no guarantee that the Fund will achieve its investment
objective, and an investor in the Fund could lose money.

Credit Risk

Credit risk is the risk that the issuer of a fixed income security will not be
able to pay principal and interest when due. There are different levels of
credit risk. Funds that invest in lower-rated securities have higher levels of
credit risk. Lower-rated or unrated securities of equivalent quality, generally
known as "junk bonds", have very high levels of credit risk. "Junk bonds" are
considered to be speculative in their capacity to pay interest and repay
principal. The price of a fixed income security can be expected to fall if the
issuer defaults on its obligation to pay principal or interest, the rating
agencies downgrade the issuer's credit rating or there is negative news that
affects the market's perception of the issuer's credit risk.

Interest Rate Risk

When interest rates rise, the prices of fixed income securities in the Fund's
portfolio will generally fall. Conversely, when interest rates fall, the prices
of fixed income securities in the Fund's portfolio will generally rise. Even
Funds that invest in the highest quality debt securities are subject to interest
rate risk. Interest rate risk usually will affect the price of a fixed income
security more if the security has a longer maturity because changes in interest
rates are increasingly difficult to predict over longer periods of time. Fixed
income securities with longer maturities will therefore be more volatile than
other fixed income securities with shorter maturities.

Investment Management Risk

Investment management risk is the risk that the Fund does not achieve its
investment objective, even though the Sub-Adviser uses various investment
strategies and techniques.

Liquidity Risk

This is the risk that the Fund will not be able to sell a security at a
reasonable price because there are too few people who actively buy and sell, or
trade, that security on a regular basis. Liquidity risk increases for Funds
investing in foreign investments (especially emerging markets securities),
smaller companies, lower credit quality bonds (also called "junk bonds"),
restricted securities, over-the-counter securities and derivatives.

Market Risk

This is the risk that the price of a security held by the Fund will fall due to
changing economic, political or market conditions or to factors affecting
investor psychology.

Prepayment Risk

While mortgage-backed securities may have a stated maturity, their expected
maturities may vary when interest rates rise or fall. When interest rates fall,
homeowners are more likely to prepay their mortgage loans which may result in an
unforeseen loss of future interest income to a Fund. Also, because prepayments
increase when interest rates fall, the prices of mortgage-backed securities do
not increase as much as other fixed income securities when interest rates fall.


                                                   -----------------------------
                                                   Allmerica Investment Trust

<PAGE>


                      [GRAPHIC] Other Investment Strategies

The Fund Summary on page 3 describes the investment objective and the principal
investment strategies and risks of the Fund. The Fund may at times use the
following investment strategies. Attached as an Appendix is a chart with a
listing of various investment techniques and strategies that the Sub-Adviser of
the Fund may utilize. The Fund may decide that it is in the best interests of
shareholders to make changes to its investment objective and strategies
described in this Prospectus. The investment objective and strategies may be
changed with the approval of the Board of Trustees, but without shareholder
approval.

Derivative Investments. Instead of investing directly in the types of portfolio
securities described in the Summary, the Fund may buy or sell a variety of
"derivative" investments to gain exposure to particular securities or markets.
Derivatives are financial contracts whose value depends on, or is derived from,
the value of an underlying asset, reference rate or index. The Fund's
Sub-Adviser will sometimes use derivatives as part of a strategy designed to
reduce other risks and sometimes will use derivatives to enhance returns, which
increases opportunities for gain but also involves greater risk.

Foreign Investments. The Fund may invest all or a substantial part of its
portfolio in securities of companies that are located or primarily doing
business in a foreign country. A company is considered to be located in a
foreign country if it is organized under the laws of, or has a principal office
in, that country. A company is considered as primarily doing business in a
country if (i) the company derives at least 50% of its gross revenues or profits
from either goods or services produced or sold in the country or (ii) at least
50% of the company's assets are situated in the country. The Fund may invest in
foreign securities either directly or indirectly through the use of depositary
receipts, such as ADRs. Depositary receipts are generally issued by banks or
trust companies and evidence ownership of underlying foreign securities. An ADR
may be sponsored by the issuer of the underlying foreign security or it may be
issued in unsponsored form. The holder of a sponsored ADR is likely to receive
more frequent and extensive financial disclosure concerning the foreign issuer
than the holder of an unsponsored ADR and generally will bear lower transaction
charges.

High Yield Securities. The Select Income Fund may purchase corporate debt
securities which are high yield securities, or "junk bonds" (rated at the time
of purchase BB or lower by Moody's or S&P, or equivalently rated by another
rating agency, or unrated but believed by the Sub-Adviser to have similar
quality.) These securities are considered to be speculative in their capacity to
pay interest and repay principal.


- -----------------------------
Allmerica Investment Trust

                                                                               7
<PAGE>


Lending of Securities. To realize additional income, the Fund may lend portfolio
securities to broker-dealer or financial institutions in an amount up to 33-1/3%
of the Fund's total assets. While any such loan is outstanding, the Fund will
continue to receive amounts equal to the interest or dividends paid by the
issuer on the securities, as well as interest (less any rebates to be paid to
the borrower) on the investment of the collateral or a fee from the borrower.
The Fund will have the right to call each loan and obtain the securities.
Lending portfolio securities involves possible delays in receiving additional
collateral or in the recovery of the securities or possible loss of rights in
the collateral.

Restricted Securities. The Fund may purchase securities that are not registered
under Federal securities law ("restricted securities"), but can be offered and
sold to certain "qualified institutional buyers". The Fund will not invest more
than 15% of its net assets in restricted securities (and securities deemed to be
illiquid). This limit does not apply if the Board of Trustees determines that
the restricted securities are liquid. The Board of Trustees has adopted
guidelines and delegated to the Manager the daily function of determining and
monitoring the liquidity of restricted securities. The Board, however, retains
sufficient oversight and is ultimately responsible for the determinations. This
investment practice could increase the level of illiquidity in the Fund if
buyers lose interest in restricted securities. As a result, the Fund might not
be able to sell these securities when its Sub-Adviser wants to sell, or might
have to sell them at less than fair value. In addition, market quotations for
these securities are less readily available.

Temporary Defensive Strategies. At times the Sub-Adviser may determine that
market conditions make it desirable temporarily to suspend the Fund's normal
investment activities. This is when the Fund may temporarily invest in a variety
of lower-risk securities, such as U.S. Government and other high quality bonds
and short-term debt obligations. Such strategies attempt to reduce changes in
the value of the Fund's shares. The Fund may not achieve its investment
objective while these strategies are in effect.

Frequent Trading. The Fund from time to time may engage in active and frequent
trading to achieve its investment objective. Frequent trading increases
transaction costs, which could detract from the Fund's performance.


- -----------------------------
Allmerica Investment Trust

                                                                               8
<PAGE>


                        [GRAPHIC] Management of the Funds
                        ---------------------------------

The Trust is governed by a Board of Trustees. Allmerica Financial Investment
Management Services, Inc. is the investment Manager of the Trust responsible for
managing the Trust's day-to-day business affairs. The Manager is located at 440
Lincoln Street, Worcester, MA 01653. The Manager and its predecessor, Allmerica
Investment Management Company, Inc., have been managing mutual funds since 1985.
The Manager currently serves as investment manager to one other mutual fund.
Standish, Ayer & Wood, Inc. ("SAW"), located at One Financial Center, Boston, MA
02111, serves as the Fund's Sub-Adviser. SAW was founded in 1933 and as of
December 31, 1999 had approximately $45 billion in assets under management. SAW
manages portfolios for pension plans, financial institutions and endowment and
foundation funds.

The Trust and Manager have obtained an order of exemption from the SEC that
permits the Manager to enter into and materially amend sub-advisory agreements
with non-affiliated Sub-Advisers without obtaining shareholder approval. The
Manager has ultimate responsibility to oversee the Sub-Adviser. The Manager has
the ability, subject to approval of the Trustees, to hire and terminate the
Sub-Adviser and to change materially the terms of the Sub-Adviser Agreement,
including the compensation paid to the Sub-Adviser. The Sub-Adviser has been
selected by the Manager and Trustees with the help of BARRA RogersCasey, Inc., a
pension consulting firm. The fees earned by the Sub-Adviser and BARRA
RogersCasey are paid by the Manager. The performance by the Sub-Adviser is
reviewed quarterly by a committee of the Board of Trustees, with assistance from
BARRA RogersCasey.

The following table provides information about the individuals from SAW who are
primarily responsible for the day-to-day management of the Select Income Fund:


<TABLE>
<CAPTION>
Name and Title of                    Service with                   Business Experience
Portfolio Manager(s)                 Sub-Adviser                    for Past Five Years
- --------------------                 -----------                    -------------------
<S>                                  <C>                            <C>
Edward H. Ladd,                      1962 - Present                 He is the firm's economist and
Chairman and Managing Director                                      also assists clients in establish-
                                                                    ing investment strategies.
                                                                    Mr. Ladd is a Director of
                                                                    the Federal Reserve Bank of
                                                                    Boston, New England Electric
                                                                    System, Greylock Management
                                                                    and Harvard Management
                                                                    Corp. and a member of SAW's
                                                                    Executive Committee.

George W. Noyes, President and       1970 - Present                 He directs bond policy
Managing Director                                                   formulation and manages
                                                                    institutional bond portfolios
                                                                    at SAW. Mr. Noyes is Vice
                                                                    Chairman of the ICFA
                                                                    Research Foundation and
                                                                    serves on SAW's Executive
                                                                    Committee.

Dolores S. Driscoll,                 1974 - Present                 She manages fixed-income
Managing Director                                                   portfolios with specific
                                                                    emphasis on mortgage pass-
                                                                    throughs and original issue
                                                                    discount bonds. Ms. Driscoll
                                                                    also serves on SAW's
                                                                    Executive Committee.

Richard C. Doll,                     1984 - Present                 He is a portfolio manager
Vice President and Director                                         with research responsibilities
                                                                    in convertible bonds. Prior to
                                                                    joining SAW, Mr. Doll was a
                                                                    Vice President with the Bank
                                                                    of New England.

Maria D. Furman, Vice President      1976 - Present                 She is head of the tax-
and Managing Director                                               exempt area and manages
                                                                    insurance and pension fund
                                                                    accounts. Ms. Furman
                                                                    currently serves on SAW's
                                                                    Executive Committee.
                                                                    --------------------
</TABLE>


                                                   -----------------------------
                                                   Allmerica Investment Trust


9
<PAGE>


For the fiscal year ended December 31, 1999, the Fund paid the Manager a fee of
0.52% of the Fund's average net assets, and the Manager paid SAW an aggregate
fee of 0.20% of the Fund's average net assets.


                             Pricing of Fund Shares

The Select Income Fund sells and redeems its shares at a price equal to its net
asset value ("NAV") without paying any sales or redemption charges. The NAV of a
share is computed by adding the current value of all the Fund's assets,
subtracting its liabilities and dividing by the number of its outstanding
shares. NAV is computed once daily at the close of regular trading on the New
York Stock Exchange each day the Exchange is open - normally 4:00 p.m. Eastern
Time. Orders for the purchase or redemption of shares are filled at the next NAV
computed after an order is received by the Fund. The Fund does not accept orders
or compute its NAV on days when the Exchange is closed.

Debt securities (other than short-term obligations) normally are valued based on
pricing service valuations. Debt obligations with a remaining maturity of 60
days or less are valued at amortized cost when amortized cost is considered to
represent fair value. Values for short-term obligations having a remaining
maturity of more than 60 days are based upon readily available market
quotations. Certain foreign markets may be open on days when the Fund does not
accept orders or price its shares. As a result, the NAV of the Fund's shares may
change on days when shareholders will not be able to buy or sell shares. In
other cases, debt and equity securities and any other assets are valued at their
fair value following procedures approved by the Trustees.

                        Purchase and Redemption of Shares

Shares of the Fund currently are purchased only by Separate Accounts which are
the funding mechanisms for variable annuity contracts and variable life
insurance policies. The Distributor, Allmerica Investments, Inc., at its
expense, may provide promotional incentives to dealers who sell variable annuity
contracts which invest in the Fund. The Trust has obtained an exemptive order
from the Securities and Exchange Commission to permit Fund shares to be sold to
variable annuity and variable life insurance separate accounts of both
affiliated and unaffiliated life insurance companies and certain qualified
pension and retirement plans. Material irreconcilable conflicts may arise among
various insurance policy owners and plan participants. The Trustees will monitor
events to identify any material conflicts and determine if any action should be
taken to resolve such conflict.

No fee is charged by the Trust on redemption. The variable contracts funded
through the Separate Accounts are sold subject to certain fees and charges which
may include sales and redemption charges. See the prospectuses for the variable
insurance products.

Normally, redemption payments will be made within seven days after the Trust
receives a written redemption request. Redemptions may be suspended when trading
on the New York Stock Exchange is restricted or when permitted by the Securities
and Exchange Commission.


- -----------------------------
Allmerica Investment Trust

                                                                              10
<PAGE>


                             Distributions and Taxes
                             -----------------------

Distributions

The Fund pays out substantially all of its net capital gains to shareholders
each year. Net investment income is paid quarterly. Distributions of net
capital gains for the year, if any, are made annually. All dividends and capital
gain distributions are applied to purchase additional Fund shares at net asset
value as of the payment date. Fund shares are held by the Separate Accounts and
any distributions are reinvested automatically by the Separate Accounts.


Taxes

The Trust seeks to comply with the provisions of the Internal Revenue Code
applicable to regulated investment companies so that the Trust will not be
subject to federal income tax. Under current tax law, dividend or capital gain
distributions from the Fund are not currently taxable when left to accumulate
within a variable annuity or variable life insurance contract. Withdrawals from
a contract generally are subject to ordinary income tax and, in many cases, to
an additional 10% penalty tax on withdrawals before age 59 1/2. Tax consequences
to investors in the Separate Accounts which are invested in the Trust are
described in more detail in the prospectuses for those accounts.


                         [GRAPHIC] Financial Highlights

                           Allmerica Investment Trust

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                Income from Investment Operations
                    ---------------------------------------------------------
                                           Net Realized
                       Net                     and
                      Asset       Net       Unrealized             Dividends
                      Value    Investment  Gain (Loss)  Total from  from Net
    Year Ended      Beginning    Income         on      Investment Investment
   December 31,      of Year  (Loss) (/1/) Investments  Operations   Income
   ------------     --------- ------------ ------------ ---------- ----------
<S>                 <C>       <C>          <C>          <C>        <C>
Select Income Fund
       1999          $1.032      $0.062      $(0.071)    $(0.009)   $(0.009)
       1998           1.022       0.059        0.010       0.069     (0.069)
       1997           0.995       0.060        0.028       0.088     (0.061)
       1996           1.024       0.061       (0.029)      0.032     (0.061)
       1995           0.930       0.060        0.095       0.155     (0.060)
<CAPTION>
                                    Less Distributions
                    ------------------------------------------------------
                                                                              Net
                    Distributions                                           Increase
                      from Net                                             (Decrease)
                      Realized    Distributions                                in
    Year Ended         Capital         in          Return of     Total     Net Asset
   December 31,         Gains        Excess         Capital  Distributions   Value
   ------------     ------------- ---------------- --------- ------------- ----------
<S>                 <C>           <C>              <C>       <C>           <C>
Select Income Fund
       1999            $(0.007)       $  --           $--       $(0.070)    $(0.079)
       1998                 --           --            --        (0.059)      0.010
       1997                 --           --            --        (0.061)      0.027
       1996                 --           --            --        (0.061)     (0.039)
       1995                 --       (0.001)(2)        --        (0.061)      0.094
</TABLE>
- ------------------------------------
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.
(1)  Net investment income (loss) per share before reimbursement of fees by the
     investment adviser or reductions was $0.060 in 1995.
(2)  Distributions in excess of net investment income.


<TABLE>
<CAPTION>
                           Ratios/Supplemental Data
           ---------------------------------------------------------------
                            Ratios To Average Net Assets
                    ------------------------------------------------
                    Net Assets
Net Asset             End of        Net        Operating       Management   Portfolio
Value End  Total       Year     Investment      Expenses          Fee       Turnover
 of Year   Return    (000's)   Income (Loss) (A)   (B)   (C)   Gross  Net     Rate
- ---------  ------   ---------- ------------- ----  ----  ----  -----  ----  ---------
<S>        <C>      <C>        <C>           <C>   <C>   <C>   <C>    <C>   <C>
 $0.953    (0.85)%   $174,037      6.26%     0.61% 0.61% 0.61% 0.52%  0.52%    177%
  1.032     6.83%     160,450      5.92%     0.64% 0.64% 0.64% 0.54%  0.54%    130%
  1.022     9.17%     104,253      6.12%     0.72% 0.72% 0.72% 0.59%  0.59%     79%
  0.995     3.32%      77,498      6.29%     0.74% 0.74% 0.74% 0.60%  0.60%    108%
  1.024    16.96%      60,368      6.24%     0.79%   --  0.80% 0.60%  0.59%    131%
</TABLE>


The financial highlights tables are intended to help you understand the Fund's
financial performance for the past five years. Certain information reflects
financial results for a single Fund share. The total returns in the tables
represent the rate that an investor would have earned or lost on an investment
in the Fund (assuming reinvestment of all dividends and distributions). This
information has been audited by PricewaterhouseCoopers LLP, whose report, along
with the Fund's financial statements, are included in the Statement of
Additional Information or annual report, which is available upon request.


                                                   -----------------------------
                                                   Allmerica Investment Trust

11
<PAGE>


[GRAPHIC]                             APPENDIX

Investment Techniques and Strategies


In managing its portfolios of investments, the Fund may make use of the
following investment techniques and strategies:

Symbols
    o     Permitted
    --    Not Permitted


INVESTMENT TECHNIQUE/STRATEGY
Asset-Backed Securities                                               o
Financial Futures Contracts
     and Related Options                                              o
Foreign Securities                                                    o
Forward Commitments                                                   o
Forward Contracts on Foreign Currencies                               --
High Yield Securities                                                 o
Investments in Money Market Securities                                o
Mortgage-Backed Securities                                            o
Purchasing Options                                                    o
Repurchase Agreements                                                 o
Restricted Securities                                                 o
Reverse Repurchase Agreements                                         --
Securities Lending                                                    o
Stand-By Commitments                                                  o
Stripped Mortgage-Backed Securities                                   o
Swap and Swap-Related Products                                        --
When-Issued Securities                                                o
Writing Covered Options                                               o



                                                   -----------------------------
                                                   Allmerica Investment Trust

13
<PAGE>


                       THIS PAGE LEFT BLANK INTENTIONALLY.


- -----------------------------
Allmerica Investment Trust

                                                                              14
<PAGE>


                           Allmerica Investment Trust

                               Select Income Fund

The Trust's Statement of Additional Information ("SAI") includes additional
information about the Fund. The Trust's annual and semi-annual reports to
shareholders include information about the investments of the Fund. The SAI and
the financial statements included in the Fund's most recent annual report to
shareholders are incorporated by reference into this prospectus, which means
they are part of this prospectus for legal purposes. The Trust's annual report
discusses the market conditions and investment strategies that significantly
affected the Fund's performance during its last fiscal year. You may get free
copies of these materials, request other information about a Fund or make
shareholder inquiries by calling 1-800-828-0540.

You may review and copy information about the Trust, including its SAI, at the
Securities and Exchange Commission's Public Reference Room in Washington, D.C.
You may call the Commission at 1-800-SEC-0330 for information about the
operation of the Public Reference Room. You may also access reports and other
information about the Trust on the Commission's Internet site at
http://www.sec.gov. You may get copies of this information, with payment of a
duplication fee, by writing the Public Reference Section of the Commission,
Washington, D.C. 20549-6009. You may need to refer to the Trust's file number
under the Investment Company Act, which is 811-4138.

                           ALLMERICA INVESTMENT TRUST

               440 Lincoln Street, Worcester, Massachusetts 01653
                                 1-800-828-0540
<PAGE>

Allmerica Investment Trust
- --------------------------
                                                                     Prospectus

                                                                     May 1, 2000



The Money Market Fund is a separate portfolio of the Trust which serves as the
underlying investment for an insurance related account.

This Prospectus explains what you should know about the Fund. Please read it
carefully before you invest.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined that
this Prospectus is adequate or complete. Any representation to the contrary is a
criminal offense.



                                   ALLMERICA
                                  INVESTMENT
                                     TRUST

                              440 Lincoln Street
                        Worcester, Massachusetts 01653

                                1-800-828-0540
<PAGE>

                               Table of Contents
                               -----------------
FUND SUMMARY                                                                 3

        Objectives, Strategies and Risks.................................    4

EXPENSE SUMMARY..........................................................    5

DESCRIPTION OF PRINCIPAL INVESTMENT RISKS................................    6

OTHER INVESTMENT STRATEGIES..............................................    7

MANAGEMENT OF THE FUND...................................................    8

PRICING OF FUND SHARES...................................................    9

PURCHASE AND REDEMPTION OF SHARES........................................    9

DISTRIBUTIONS AND TAXES..................................................   10



FINANCIAL HIGHLIGHTS.....................................................   11

APPENDIX.................................................................   14

                                    LEGEND
                                    ------

Performance                 [GRAPHIC APPEARS HERE]

Investment Objectives       [GRAPHIC APPEARS HERE]

Financial Information       [GRAPHIC APPEARS HERE]

Management of Fund          [GRAPHIC APPEARS HERE]

Risk                        [GRAPHIC APPEARS HERE]

Investment Strategies       [GRAPHIC APPEARS HERE]


                                                   -----------------------------
                                                   Allmerica Investment Trust

2
<PAGE>

                                  Fund Summary
                                  ------------

This Prospectus describes the Money Market Fund of Allmerica Investment Trust,
which provides a broad range of investment options through 14 different Funds,
each a separate investment Portfolio. The other Funds are described in separate
prospectuses. Shares of the Funds are sold exclusively to variable annuity and
variable life insurance Separate Accounts and qualified pension and retirement
plans.

The investment manager of the Trust is Allmerica Financial Investment Management
Services, Inc. The Manager is responsible for managing the Trust's daily
business and has general responsibility for the management of the investments of
the Funds. The Manager, at its expense, has contracted with Allmerica Asset
Management, Inc. ("AAM") as Sub-Adviser to manage the investments of the Money
Market Fund. AAM has been selected on the basis of various factors including
management experience, investment techniques and staffing. See "Management of
the Funds" for more information about the Manager and the Sub-Adviser.

The following summary describes the Money Market Fund's investment objective and
principal investment strategies, identifies the principal investment risks of
investing in the Fund and provides a performance chart for the Fund. Note that
any percentage limitations listed under the Fund's principal investment
strategies apply at the time of investment. The principal risks are discussed in
more detail under "Description of Principal Investment Risks". The bar chart
shows how the investment returns of the shares of the Fund have varied in the
past ten years . The table following the bar chart shows how the Fund's average
annual returns for the last one, five and ten years compare to those of a
broad-based securities market index. Past performance does not necessarily
indicate how the Fund will perform in the future. The bar chart and table give
some indication of the risks of investing in the Fund by showing changes in the
Fund's performance. The bar chart and table do not reflect expenses associated
with the variable insurance product that you are purchasing. If those expenses
had been reflected, the performance shown would have been lower.


- -----------------------------
Allmerica Investment Trust
                                                                               3
<PAGE>

Objectives, Strategies and Risks


                                Money Market Fund
                                -----------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to obtain maximum
                        current income consistent with preservation of capital
                        and liquidity.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund seeks to
                        achieve its objective by investing in high quality money
                        market instruments such as obligations issued or
                        guaranteed by the United States Government, its
                        agencies, or instrumentalities; commercial paper;
                        obligations of banks or savings and loan associations
                        including bankers acceptances and certificates of
                        deposit; repurchase agreements and cash and cash
                        equivalents. The Fund may invest up to 25% of its assets
                        in U.S. dollar denominated foreign debt securities and
                        short-term instruments (not including investments in
                        ADRs).

                        Any security purchased for the Fund must receive the
                        highest or second highest quality rating by at least two
                        recognized rating agencies or by one if only one has
                        rated the security. If the security is unrated the
                        security must be seen by the Sub-Adviser as having
                        comparable quality. Portfolio securities will have a
                        remaining maturity of 397 days or less and the portfolio
                        is managed to maintain a dollar-weighted maturity of 90
                        days or less.

                        The Fund attempts to maintain a constant net asset value
                        of $1.00 per share but it may not be able to do so due
                        to adverse market conditions or other factors and it is
                        possible for investors to lose money by investing in the
                        Fund. An investment in the Fund is not a bank deposit
                        and is not insured or guaranteed by the Federal Deposit
                        Insurance Corporation or any other government agency.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Credit Risk

                        . Interest Rate Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns[GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

8.17%  6.22%  3.78%  3.00%  3.93%  5.84%  5.36%  5.47%  5.51%  5.19%
- -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
1990   1991   1992   1993   1994   1995   1996   1997   1998   1999


During the period shown above the highest quarterly return was 2.01% for the
quarter ended 06/30/90 and the lowest was 0.73% for the quarter ended 6/30/93.

Performance Table

Average Annual Total Returns
(for the periods ending                    Past          Past          Past
December 31, 1999)                      One Year    Five Years    Ten Years
- ------------------                      --------    ----------    ---------

  Fund Shares                              5.19%         5.47%        5.23%
  -----------                              -----         -----        -----

  IBC/Donoghue First Tier
  Money Market Index*                      4.57%         4.97%        4.79%
  -------------------                      -----         -----        -----

* IBC/Donoghue is an independent firm that tracks regulated money market funds
on a yield, shareholder, assets size and portfolio allocation basis.

The Fund's 7-day yield ending December 31, 1999 was 5.57%.


                                                   -----------------------------
                                                   Allmerica Investment Trust
4
<PAGE>

                                 Expense Summary
                                 ---------------

Expenses are one of several factors to consider when investing in the Money
Market Fund. Expenses shown are based on expenses incurred in respect of shares
of the Fund for the 1999 fiscal year. The Example shows the cumulative expenses
attributable to a hypothetical $10,000 investment in the Fund over specified
periods.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you invest in the
Fund. Please note that the expenses listed below do not include the expenses of
the applicable variable insurance product that you are purchasing. You should
refer to the variable insurance product prospectus for more information relating
to the fees and expenses of that product, which are in addition to the expenses
of the Fund.

<TABLE>
<CAPTION>
                                           Annual Fund Operating Expenses
     Shareholder                        (expenses deducted from Fund assets)                  Total Annual
        Fees                                                                                       Fund
 (fees paid directly                  Management            Distribution             Other       Operating
from your investment)                    Fees               (12b-1) Fees           Expenses      Expenses
- ---------------------                    ----               ------------           --------      --------
<S>                                  <C>                    <C>                    <C>         <C>
           None                          0.24%                   None                0.05%        0.29%(1)
           ----                          -----                   ----                -----        --------
</TABLE>

     (1) Until further notice, the Manager has declared a voluntary expense
     limitation of 0.60% for the Money Market Fund. The total operating expenses
     of the Fund were less than its expense limitation throughout 1999.

     The declaration of a voluntary management fee or expense limitation in any
     year does not bind the Manager to declare future expense limitations with
     respect to the Fund. These limitations may be terminated at any time.

     Example

     This Example is intended to help you compare the cost of investing in the
     Fund with the cost of investing in other mutual funds.

     The Example assumes that you invest $10,000 in the Fund for the time
     periods indicated and then redeem all of your shares at the end of those
     periods. The Example also assumes that your investment earns a 5% return
     each year and that the Fund's operating expenses remain the same. Although
     your actual costs may be higher or lower, based on these assumptions your
     costs would be:

         1 Year          3 Years           5 Years          10 Years
         ------          -------           -------          --------

          $30             $93               $163              $369
          ---             ---               ----              ----


- -----------------------------
Allmerica Investment Trust
                                                                               5
<PAGE>

               [GRAPHIC] Description of Principal Investment Risks
               ---------------------------------------------------

The following is a summary of the principal risks of investing in the Money
Market Fund and the factors likely to cause the value of your investment in the
Fund to decline. The principal risks applicable to the Fund are identified under
"Fund Summary". There are also many factors that could cause the value of your
investment in the Fund to decline which are not described here. It is important
to remember that there is no guarantee that the Fund will achieve its investment
objective, and an investor in the Fund could lose money.

Credit Risk

Credit risk is the risk that the issuer of a fixed income security will not be
able to pay principal and interest when due. There are different levels of
credit risk. Funds that invest in lower-rated securities have higher levels of
credit risk. The price of a fixed income security can be expected to fall if the
issuer defaults on its obligation to pay principal or interest, the rating
agencies downgrade the issuer's credit rating or there is negative news that
affects the market's perception of the issuer's credit risk.

Interest Rate Risk

When interest rates rise, the prices of fixed income securities in the Fund's
portfolio will generally fall. Conversely, when interest rates fall, the prices
of fixed income securities in the Fund's portfolio will generally rise. Even a
Fund that invests in the highest quality debt securities is subject to interest
rate risk. Interest rate risk usually will affect the price of a fixed income
security more if the security has a longer maturity because changes in interest
rates are increasingly difficult to predict over longer periods of time. Fixed
income securities with longer maturities will therefore be more volatile than
other fixed income securities with shorter maturities.

Investment Management Risk

Investment management risk is the risk that the Fund does not achieve its
investment objective, even though the Sub-Adviser uses various investment
strategies and techniques.

Market Risk

This is the risk that the price of a security held by the Fund will fall due to
changing economic, political or market conditions or to factors affecting
investor psychology.


                                                   -----------------------------
                                                   Allmerica Investment Trust
6
<PAGE>

                      [GRAPHIC] Other Investment Strategies
                      -------------------------------------

The Fund Summary on page 3 describes the investment objective and the principal
investment strategies and risks of the Fund. The Fund may at times use the
following investment strategies. Attached as an Appendix is a chart with a
listing of various investment techniques and strategies that the Sub-Adviser of
the Fund may utilize. The Fund may decide that it is in the best interests of
shareholders to make changes to its investment objective and strategies
described in this Prospectus. The investment objective and strategies may be
changed with the approval of the Board of Trustees, but without shareholder
approval.


Foreign Investments. The Fund may invest all or a substantial part of its
portfolio in U.S. dollar denominated securities of companies that are located or
primarily doing business in a foreign country. A company is considered to be
located in a foreign country if it is organized under the laws of, or has a
principal office in, that country. A company is considered as primarily doing
business in a country if (i) the company derives at least 50% of its gross
revenues or profits from either goods or services produced or sold in the
country or (ii) at least 50% of the company's assets are situated in the
country. Funds may invest in foreign securities either directly or indirectly
through the use of depositary receipts, such as ADRs. Depositary receipts are
generally issued by banks or trust companies and evidence ownership of
underlying foreign securities.

Lending of Securities. To realize additional income, the Fund may lend portfolio
securities to broker-dealer or financial institutions in an amount up to 33-1/3%
of the Fund's total assets. While any such loan is outstanding, the Fund will
continue to receive amounts equal to the interest or dividends paid by the
issuer on the securities, as well as interest (less any rebates to be paid to
the borrower) on the investment of the collateral or a fee from the borrower.
The Fund will have the right to call each loan and obtain the securities.
Lending portfolio securities involves possible delays in receiving additional
collateral or in the recovery of the securities or possible loss of rights in
the collateral.


Restricted Securities. The Fund may purchase securities that are not registered
under Federal securities law ("restricted securities"), but can be offered and
sold to certain "qualified institutional buyers". The Fund will not invest more
than 10% of its net assets in restricted securities (and securities deemed to be
illiquid). These limits do not apply if the Board of Trustees determines that
the restricted securities are liquid. The Board of Trustees has adopted
guidelines and delegated to the Manager the daily function of determining and
monitoring the liquidity of restricted securities. The Board, however, retains
sufficient oversight and is ultimately responsible for the determinations. This
investment practice could increase the level of illiquidity in the Fund if
buyers lose interest in restricted securities. As a result, the Fund might not
be able to sell these securities when its Sub-Adviser wants to sell, or might
have to sell them at less than fair value. In addition, market quotations for
these securities are less readily available.

Temporary Defensive Strategies. At times a Sub-Adviser may determine that market
conditions make it desirable temporarily to suspend the Fund's normal investment
activities. The Fund may not achieve its investment objective while these
strategies are in effect.


- -----------------------------
Allmerica Investment Trust
                                                                               7
<PAGE>

                        [GRAPHIC] Management of the Fund
                        --------------------------------

The Trust is governed by a Board of Trustees. Allmerica Financial Investment
Management Services, Inc. is the investment Manager of the Trust responsible for
managing the Trust's day-to-day business affairs. The Manager is located at 440
Lincoln Street, Worcester, MA 01653. The Manager and its predecessor, Allmerica
Investment Management Company, Inc., have been managing mutual funds since 1985.
The Manager currently serves as investment manager to one other mutual fund.
Allmerica Asset Management, Inc., located at 440 Lincoln Street, Worcester,
Massachusetts, serves as the Fund's Sub-Adviser. AAM was incorporated in 1993
and as of December 31, 1999 had $13.3 billion in assets under management. AAM
serves as investment adviser to investment companies and affiliated insurance
company accounts. John C. Donohue, Vice President of AAM, is primarily
responsible for the day-to-day management of the Fund. Mr. Donohue has been with
AAM since 1995. He was a portfolio manager at CS First Boston Investment
Management prior to joining AAM.

The Sub-Adviser has been selected by the Manager and Trustees with the help of
BARRA RogersCasey, Inc., a pension consulting firm. The fees earned by the
Sub-Adviser and BARRA RogersCasey are paid by the Manager. The performance of
the Sub-Adviser is reviewed quarterly by a committee of the Board of Trustees,
with assistance from BARRA RogersCasey.

For the fiscal year ended December 31, 1999, the Fund paid the Manager a fee of
0.24% of the Fund's average net assets, and the Manager paid AAM an aggregate
fee of 0.09% of the Fund's average net assets.


                                                   -----------------------------
                                                   Allmerica Investment Trust
8
<PAGE>

                             Pricing of Fund Shares
                             ----------------------

The Money Market Fund sells and redeems its shares at a price equal to its net
asset value ("NAV") without paying any sales or redemption charges. The NAV of a
share is computed by adding the current value of all the Fund's assets,
subtracting its liabilities and dividing by the number of its outstanding
shares. NAV is computed once daily at the close of regular trading on the New
York Stock Exchange each day the Exchange is open - normally 4:00 p.m. Eastern
Time. Orders for the purchase or redemption of shares are filled at the next NAV
computed after an order is received by the Fund. The Fund does not accept orders
or compute its NAV on days when the Exchange is closed. All securities of the
Fund are valued at amortized cost.


                        Purchase and Redemption of Shares
                        ---------------------------------

Shares of the Fund currently are purchased only by a separate account which is
the funding mechanism for a variable annuity contract. The Distributor,
Allmerica Investments, Inc., at its expense, may provide promotional incentives
to dealers who sell variable annuity contracts which invest in the Fund. The
Trust has obtained an exemptive order from the Securities and Exchange
Commission to permit Fund shares to be sold to variable annuity and variable
life insurance separate accounts of both affiliated and unaffiliated life
insurance companies and certain qualified pension and retirement plans. Material
irreconcilable conflicts may arise among various insurance policy owners and
plan participants. The Trustees will monitor events to identify any material
conflicts and determine if any action should be taken to resolve such conflict.

No fee is charged by the Trust on redemption. The variable contracts funded
through the Separate Account are sold subject to certain fees and charges which
may include sales and redemption charges. See the prospectuses for the variable
insurance product.

Normally, redemption payments will be made within seven days after the Trust
receives a written redemption request. Redemptions may be suspended when trading
on the New York Stock Exchange is restricted or when permitted by the Securities
and Exchange Commission.


- -----------------------------
Allmerica Investment Trust
                                                                               9
<PAGE>

                             Distributions and Taxes
                             -----------------------

Distributions

The Fund pays out substantially all of its net investment income daily.
Distributions of net capital gains for the year, if any, are made annually. All
dividends and capital gain distributions are applied to purchase additional Fund
shares at net asset value as of the payment date. Fund shares are held by the
Separate Account and any distributions are reinvested automatically by the
Separate Account.

Taxes

The Trust seeks to comply with the provisions of the Internal Revenue Code
applicable to regulated investment companies so that the Trust will not be
subject to federal income tax. Under current tax law, dividend or capital gain
distributions from the Fund are not currently taxable when left to accumulate
within a variable annuity or variable life insurance contract. Withdrawals from
a contract generally are subject to ordinary income tax and, in many cases, to
an additional 10% penalty tax on withdrawals before age 59 1/2. Tax consequences
to investors in the Separate Accounts which are invested in the Trust are
described in more detail in the prospectuses for those accounts.




                                                   -----------------------------
                                                   Allmerica Investment Trust
10
<PAGE>

                         [GRAPHIC] Financial Highlights
                         ------------------------------

                           Allmerica Investment Trust

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                          Income from Investment Operations                             Less Distributions
              --------------------------------------------------------- ---------------------------------------------------
                                     Net Realized
                 Net                     and                            Distributions
                Asset       Net       Unrealized             Dividends    from Net
                Value    Investment  Gain (Loss)  Total from  from Net    Realized    Distributions
 Year Ended   Beginning    Income         on      Investment Investment    Capital         in       Return of     Total
December 31,   of Year     (Loss)    Investments  Operations   Income       Gains        Excess      Capital  Distributions
- ------------  --------- ------------ ------------ ---------- ---------- ------------- ------------- --------- -------------
<S>           <C>       <C>          <C>          <C>        <C>        <C>           <C>           <C>       <C>
Money Market
    Fund
    1999        1.000      0.051          --        0.051      (0.051)        --            --          --       (0.051)
    1998        1.000      0.054          --        0.054      (0.054)        --            --          --       (0.054)
    1997        1.000      0.053          --        0.053      (0.053)        --            --          --       (0.053)
    1996        1.000      0.052          --        0.052      (0.052)        --            --          --       (0.052)
    1995        1.000      0.057          --        0.057      (0.057)        --            --          --       (0.057)
<CAPTION>
                 Net
               Increase
              (Decrease)
                  in
 Year Ended   Net Asset
December 31,    Value
- ------------  ----------
<S>           <C>
Money Market
    Fund
    1999          --
    1998          --
    1997          --
    1996          --
    1995          --
</TABLE>
- ------------------------------------
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.


<TABLE>
<CAPTION>
                           Ratios/Supplemental Data
           -------------------------------------------------------------
                          Ratios To Average Net Assets
                  ------------------------------------------------
                  Net Assets
Net Asset           End of        Net        Operating       Management   Portfolio
Value End  Total     Year     Investment      Expenses          Fee       Turnover
 of Year   Return  (000's)   Income (Loss) (A)   (B)   (C)   Gross  Net     Rate
- ---------  ------ ---------- ------------- ----  ----  ----  -----  ----  ---------
<S>        <C>    <C>        <C>           <C>   <C>   <C>   <C>    <C>   <C>
  1.000     5.19%  513,606       5.09%     0.29% 0.29% 0.29% 0.24%  0.24%    N/A
  1.000     5.51%  336,253       5.36%     0.32% 0.32% 0.32% 0.26%  0.26%    N/A
  1.000     5.47%  260,620       5.33%     0.35% 0.35% 0.35% 0.27%  0.27%    N/A
  1.000     5.36%  217,256       5.22%     0.34% 0.34% 0.34% 0.28%  0.28%    N/A
  1.000     5.84%  155,211       5.68%     0.36%   --  0.36% 0.29%  0.29%    N/A
</TABLE>

The financial highlights tables are intended to help you understand the Fund's
financial performance for the past five years. Certain information reflects
financial results for a single Fund share. The total returns in the tables
represent the rate that an investor would have earned or lost on an investment
in the Fund (assuming reinvestment of all dividends and distributions). This
information has been audited by PricewaterhouseCoopers LLP, whose report, along
with the Fund's financial statements, are included in the Statement of
Additional Information or annual report, which is available upon request.


- -----------------------------
Allmerica Investment Trust
                                                                              11

<PAGE>

[GRAPHIC]                          APPENDIX

Investment Techniques and Strategies


In managing its portfolio of investments, the Fund may make use of the following
investment techniques and strategies:

Symbols

     o   Permitted

     --  Not Permitted

            INVESTMENT TECHNIQUE/STRATEGY
            -----------------------------

            Asset-Backed Securities                                       o
            Financial Futures Contracts
                    and Related Options                                   --
            Foreign Securities                                            o
            Forward Commitments                                           o
            Forward Contracts on Foreign Currencies                       --
            High Yield Securities                                         --
            Investments in Money Market Securities                        o
            Mortgage-Backed Securities                                    --
            Purchasing Options                                            --
            Repurchase Agreements                                         o
            Restricted Securities                                         o
            Reverse Repurchase Agreements                                 --
            Securities Lending                                            o
            Stand-By Commitments                                          o
            Stripped Mortgage-Backed Securities                           --
            Swap and Swap-Related Products                                --
            When-Issued Securities                                        o
            Writing Covered Options                                       --
            -----------------------                                       --


- -----------------------------
Allmerica Investment Trust
                                                                              12
<PAGE>

                       This page left blank intentionally.


                                                   -----------------------------
                                                   Allmerica Investment Trust
13
<PAGE>

                           Allmerica Investment Trust

                                Money Market Fund

The Trust's Statement of Additional Information ("SAI") includes additional
information about the Fund. The Trust's annual and semi-annual reports to
shareholders include information about the investments of the Fund. The SAI and
the financial statements included in the Fund's most recent annual report to
shareholders are incorporated by reference into this prospectus, which means
they are part of this prospectus for legal purposes. The Trust's annual report
discusses the market conditions and investment strategies that significantly
affected a Fund's performance during its last fiscal year. You may get free
copies of these materials, request other information about a Fund or make
shareholder inquiries by calling 1-800-828-0540.

You may review and copy information about the Trust, including its SAI, at the
Securities and Exchange Commission's Public Reference Room in Washington, D.C.
You may call the Commission at 1-800-SEC-0330 for information about the
operation of the Public Reference Room. You may also access reports and other
information about the Trust on the Commission's Internet site at
http://www.sec.gov. You may get copies of this information, with payment of a
duplication fee, by writing the Public Reference Section of the Commission,
Washington, D.C. 20549-6009. You may need to refer to the Trust's file number
under the Investment Company Act, which is 811-4138.

                                   ALLMERICA
                                  INVESTMENT
                                     TRUST

              440 Lincoln Street, Worcester, Massachusetts 01653
                                1-800-828-0540
<PAGE>

Allmerica Investment Trust
- --------------------------

                                                                     Prospectus

                                                                     May 1, 2000


This Prospectus describes the following 13 investment Funds of the Trust which
serve as the underlying investments for insurance related accounts.

                          Select Emerging Markets Fund

                          Select Aggressive Growth Fund

                        Select Capital Appreciation Fund

                          Select Value Opportunity Fund

                        Select International Equity Fund

                               Select Growth Fund

                          Select Strategic Growth Fund

                                Core Equity Fund

                                Equity Index Fund

                          Select Growth and Income Fund



                       Select Investment Grade Income Fund

                              Government Bond Fund

                                Money Market Fund

This Prospectus explains what you should know about each of the Funds. Please
read it carefully before you invest.

A particular Fund may not be available under the variable annuity or variable
life insurance policy which you have chosen. The Prospectus of the specific
insurance product you have chosen will indicate which Funds are available and
should be read in conjunction with this Prospectus. Inclusion in this Prospectus
of a Fund which is not available under your policy is not to be considered a
solicitation.

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined that
this Prospectus is adequate or complete. Any representation to the contrary is a
criminal offense.

                           Allmerica Investment Trust
                               440 Lincoln Street
                         Worcester, Massachusetts 01653

                                 1-800-828-0540
<PAGE>

                                Table of Contents

FUND SUMMARIES.............................................................   3

        Objectives, Strategies and Risks...................................   4

              Select Emerging Markets Fund.................................   4

              Select Aggressive Growth Fund................................   5

              Select Capital Appreciation Fund.............................   6

              Select Value Opportunity Fund................................   7

              Select International Equity Fund.............................   8

              Select Growth Fund...........................................   9

              Select Strategic Growth Fund.................................  10

              Core Equity Fund.............................................  11

              Equity Index Fund............................................  12

              Select Growth and Income Fund................................  13



              Select Investment Grade Income Fund..........................  14

              Government Bond Fund.........................................  15

              Money Market Fund............................................  16

EXPENSE SUMMARY............................................................  17

DESCRIPTION OF PRINCIPAL INVESTMENT RISKS..................................  21

OTHER INVESTMENT STRATEGIES................................................  23

MANAGEMENT OF THE FUNDS....................................................  25

PRICING OF FUND SHARES.....................................................  34

PURCHASE AND REDEMPTION OF SHARES..........................................  34

DISTRIBUTIONS AND TAXES....................................................  35



FINANCIAL HIGHLIGHTS.......................................................  36

APPENDIX...................................................................  43

LEGEND

Performance                                    [GRAPHIC]

Investment                                     [GRAPHIC]
Objectives

Financial                                      [GRAPHIC]
Information

Management                                     [GRAPHIC]
of Fund

Risk                                           [GRAPHIC]

Investment                                     [GRAPHIC]
Strategies


                                                 -------------------------------
                                                   Allmerica Investment Trust
2
<PAGE>

                                 Fund Summaries

Allmerica Investment Trust provides a broad range of investment options through
13 separate investment portfolios, or Funds. Shares of the Funds are sold
exclusively to variable annuity and variable life insurance Separate Accounts
and qualified pension and retirement plans.

The investment manager of the Trust is Allmerica Financial Investment Management
Services, Inc. The Manager is responsible for managing the Trust's daily
business and has general responsibility for the management of the investments of
the Funds. The Manager, at its expense, has contracted with investment
Sub-Advisers to manage the investments of the Funds. Each Sub-Adviser has been
selected on the basis of various factors including management experience,
investment techniques and staffing. See "Management of the Funds" for more
information about the Manager and the Sub-Advisers.

The following summaries describe each Fund's investment objective and principal
investment strategies, identify the principal investment risks of investing in
the Fund and provide performance charts for the Fund. Note that any percentage
limitations listed under a Fund's principal investment strategies apply at the
time of investment. The principal risks are discussed in more detail under
"Description of Principal Investment Risks". The bar charts show how the
investment returns of the shares of a Fund have varied in the past ten years (or
for the life of the Fund if less than 10 years). The table following each bar
chart shows how the Fund's average annual return for the last one, five and ten
years (or for the life of the Fund, if shorter) compare to those of a
broad-based securities market index. Past performance does not necessarily
indicate how the Fund will perform in the future. The bar charts and tables give
some indication of the risks of investing in each Fund by showing changes in the
Fund's performance. The bar charts and tables do not reflect expenses associated
with the variable insurance product that you are purchasing. If those expenses
had been reflected, the performance shown would have been lower.


- -----------------------------
Allmerica Investment Trust
                                                                               3
<PAGE>

Objectives, Strategies and Risks


                                  Select Emerging Markets Fund
                                  ----------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Schroder Investment Management North
                        America Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks long-term growth of
                        capital by investing in the world's emerging markets.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: While its investments
                        are not limited to any specific region of the world, the
                        Fund normally invests at least 65% of its assets in
                        companies located or primarily operating in countries
                        with emerging markets. The Fund usually has investments
                        in at least five developing countries. Before the Fund
                        invests in a country, the Sub-Adviser considers various
                        factors such as that country's political stability and
                        economic prospects. In selecting securities for the
                        Fund, the Sub-Adviser focuses on the long-term growth
                        potential of the securities.

                        The Fund invests primarily in equities, including common
                        stock, preferred stock, securities convertible into
                        common stock, rights and warrants and similar
                        securities. The Fund also may invest up to 35% of its
                        assets in debt securities of issuers in emerging
                        markets, equity and debt securities of issuers in
                        developed countries, cash and cash equivalents. The Fund
                        may invest in lower rated bonds, commonly known as "junk
                        bonds", as further discussed in the "Description of
                        Principal Investment Risks."

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Credit Risk

                        . Currency Risk

                        . Derivatives Risk

                        . Emerging Markets Risk

                        . Foreign Investment Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

 See "Description of Principal Investment Risks."

 The bar chart and table below do not reflect expenses at the insurance product
 level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                                     65.72%
                                     ------
                                      1999

During 1998 and the period shown above the highest quarterly return was 29.52%
for the quarter ended 12/31/99 and the lowest was (21.23)% for the quarter ended
9/30/98.


Performance Table

Average Annual Total Returns
(for the periods ending                       Past        Since Inception
December 31, 1999)                          One Year    (February 20, 1998)
- ------------------                          --------    -------------------

  Fund Shares                                 65.72%                 15.22%
  -----------                                -------                 ------

  MSCI Emerging Markets Free Index*           66.41%                 11.50%
  ---------------------------------          -------                 ------


* The MSCI Emerging Markets Free Index is an unmanaged index of 26 emerging
markets.

                                                 -------------------------------
                                                   Allmerica Investment Trust
4
<PAGE>

Objectives, Strategies and Risks


                                Select Aggressive Growth Fund
                                -----------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Nicholas-Applegate Capital Management, L.P.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks above-average
                        capital appreciation by investing primarily in common
                        stocks of companies which are believed to have
                        significant potential for capital appreciation.

 [GRAPHIC APPEARS HERE] Principal Investment Strategies: To pursue this goal,
                        the Fund looks predominantly for stocks of small and
                        mid-size companies that show potential for rapid growth.
                        The Fund typically invests in companies that, because of
                        positive developments affecting the company, offer the
                        possibility of accelerating earnings. The Sub-Adviser
                        uses systematic, fundamental research in selecting
                        investments for the Fund.

                        Under normal circumstances, the Fund invests at least
                        65% of its assets in common stocks, securities
                        convertible into common stocks and warrants. The Fund
                        also may invest in debt securities and preferred stocks
                        and up to 25% of its assets in foreign securities (not
                        including its investments in American Depositary
                        Receipts or "ADRs").

 [GRAPHIC APPEARS HERE] Principal Risks:

                        . Company Risk

                        . Derivatives Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

 See "Description of Principal Investment Risks."

 The bar chart and table below do not reflect expenses at the insurance product
 level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

        19.51%   -2.31%   32.28%    18.55%    18.71%    10.56%   38.66%
        ------   ------   ------    ------    ------    ------   ------
        1993     1994     1995      1996      1997      1998     1999


During the period shown above the highest quarterly return was 25.64% for the
quarter ended 12/31/99 and the lowest was (22.81)% for the quarter ended
9/30/98.

Performance Table


Average Annual Total Returns
(for the periods ending                 Past        Past       Since Inception
December 31, 1999)                    One Year   Five Years   (August 21, 1992)
- ------------------                    --------   ----------   -----------------

  Fund Shares                           38.66%       23.32%              20.71%
  -----------                           ------       ------              ------

  Russell 2500 Index*                   24.15%       19.43%              17.37%
  -------------------                   ------       ------              ------

* The Russell 2500 Index is an unmanaged composite of 2,500 small-to-mid
capitalization stocks.


- -----------------------------
Allmerica Investment Trust
                                                                               5
<PAGE>

Objectives, Strategies and Risks


                        Select Capital Appreciation Fund
                        --------------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: T. Rowe Price Associates, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks long-term growth of
                        capital. Realization of income is not a significant
                        investment consideration and any income realized on the
                        Fund's investments will be incidental to its primary
                        objective.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund's Sub-Adviser
                        looks for companies with proven business ideas and
                        earnings growth rates in excess of market averages. The
                        Fund normally invests at least 50% of its equity assets
                        in securities of companies with market capitalizations
                        that fall within the range of companies in the S&P Mid
                        Cap 400 Index (as of December 31, 1999, $185 million to
                        $37 billion market capitalization). The Fund may also
                        invest in larger firms and firms with a market
                        capitalization below $185 million.

                        While the Fund invests primarily in common stocks, it
                        also may invest in preferred stocks, warrants,
                        government securities, corporate bonds and other debt
                        securities. Up to 25% of its assets may be invested in
                        "junk bonds". The Fund may invest without limitation in
                        foreign securities.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Credit Risk

                        . Currency Risk

                        . Derivatives Risk

                        . Foreign Investment Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                       8.80%   14.28%    13.88%   25.36%
                       -----   ------    ------   ------
                       1996    1997      1998     1999

During the period shown above the highest quarterly return was 27.90% for the
quarter ended 12/31/98 and the lowest was (18.54)% for the quarter ended
9/30/98.

T. Rowe Price Associates, Inc. became Sub-Adviser of the Fund on April 1, 1998.
Performance before that date is based on the performance of the Fund's previous
Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending                              Past     Since Inception
December 31, 1999)                               One Year     (April 28, 1995)
- ------------------                               --------     ----------------

  Fund Shares                                      25.36%               21.42%
  -----------                                      ------               ------

  Russell 2500 Index*                              24.15%               18.67%
  -------------------                              ------               ------

* The Russell 2500 Index is a unmanaged composite of 2,500 small-to-mid
capitalization stocks.


                                                 -------------------------------
                                                   Allmerica Investment Trust
6
<PAGE>

Objectives, Strategies and Risks


                               Select Value Opportunity Fund
                               -----------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Cramer Rosenthal McGlynn, LLC

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks long-term growth of
                        capital by investing primarily in a diversified
                        portfolio of common stocks of small and mid-size
                        companies, whose securities at the time of purchase are
                        considered by the Sub-Adviser to be undervalued.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund's Sub-Adviser
                        attempts to find stocks that are attractively valued
                        relative to their future prospects and the market as a
                        whole. The most promising opportunities can be found in
                        companies that are temporarily out of favor or when most
                        analysts are confused about changes taking place at a
                        company. In these situations, the company's stock is
                        often undervalued.

                        The Fund invests primarily in companies with market
                        capitalization between $200 million and $5 billion. The
                        Fund normally invests at least 80% of the portfolio in
                        common stocks and may invest in other equity securities
                        and up to 25% of its assets in foreign securities (not
                        including its investments in ADRs).

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Currency Risk

                        . Derivatives Risk

                        . Foreign Investment Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

 See "Description of Principal Investment Risks."

 The bar chart and table below do not reflect expenses at the insurance product
 level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

               -6.51%   17.60%   28.53%   24.85%   4.87%   -4.70%
               ------   ------   ------   ------   -----   ------
               1994     1995     1996     1997     1998    1999


During the period shown above the highest quarterly return was 15.52% for the
quarter ended 3/31/99 and the lowest was (16.86)% for the quarter ended
6/30/99.

Cramer Rosenthal McGlynn, LLC became Sub-Adviser of the Fund on January 1, 1997.
Performance before that date is based on the performance of the Fund's previous
Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending              Past          Past         Since Inception
December 31, 1999)                 One Year     Five Years      (April 30, 1993)
- ------------------                 --------     ----------      ----------------


  Fund Shares                      -4.70%         13.52%             11.57%
  -----------                      ------         ------             ------

  Russell 2500 Index*              24.15%         19.43%             16.41%
  -------------------              ------         ------             ------

* The Russell 2500 Index is an unmanaged composite of 2,500 small-to-mid
capitalization stocks.


- -----------------------------
Allmerica Investment Trust
                                                                               7
<PAGE>

Objectives, Strategies and Risks


                               Select International Equity Fund
                               --------------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Bank of Ireland Asset Management (U.S.)
                        Limited

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks maximum long-term
                        total return (capital appreciation and income) primarily
                        by investing in common stocks of established non-U.S.
                        companies.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: Under normal market
                        conditions, at least 65% of the Fund's assets will be
                        invested in the securities of medium and large-size
                        companies located in at least five foreign countries,
                        not including the United States. To achieve its
                        objective, the Fund focuses on equity securities which
                        the Sub-Adviser believes are undervalued in relation to
                        the company's prospects for future earnings growth. The
                        Fund may also buy fixed-income debt securities,
                        primarily for defensive purposes.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Currency Risk

                        . Derivatives Risk

                        . Foreign Investment Risk

                        . Investment Management Risk

                        . Market Risk

 See "Description of Principal Investment Risks."

 The bar chart and table below do not reflect expenses at the insurance product
 level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                  19.63%   21.94%   4.65%   16.48%   31.71%
                  ------   ------   -----   ------   ------
                  1995     1996     1997    1998     1999


During the period shown above the highest quarterly return was 20.89% for the
quarter ended 12/31/99 and the lowest was (17.69)% for the quarter ended
09/30/98.


Performance Table

Average Annual Total Returns
(for the periods ending              Past         Past           Since Inception
December 31, 1999)                   One Year     Five Years      (May 2, 1994)
- ------------------                   --------     ----------      -------------

  Fund Shares                         31.71%        18.54%            15.47%
  -----------                         ------        ------            ------

  Morgan Stanley Capital Intl.
  EAFE Index*                         27.31%        13.15%            11.54%
  -----------                         ------        ------            ------

* The Morgan Stanley Capital International EAFE (Europe, Australia, Far East)
Index, reflecting reinvestment of gross dividends, is an unmanaged
capitalization weighted index of foreign developed country common stocks.


                                                 -------------------------------
                                                   Allmerica Investment Trust

8
<PAGE>

Objectives, Strategies and Risks


                               Select Growth Fund
                               ------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Putnam Investment Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to achieve long-
                        term growth of capital by investing in a diversified
                        portfolio consisting primarily of common stocks selected
                        on the basis of their long-term growth potential.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To attain its
                        objective, the Fund looks for companies that appear to
                        have favorable long-term growth characteristics. The
                        Fund typically invests in stocks of large capitalization
                        companies, such as those included in the S&P 500 Index,
                        although it can also make investments in smaller growth
                        companies.

                        At least 65% of the Fund's assets normally will consist
                        of common stocks that the Sub-Adviser believes have
                        growth potential. The Fund also may purchase convertible
                        bonds and preferred stocks and warrants. The Fund
                        normally invests substantially all of its investments in
                        equity securities, although it may invest up to 35% in
                        debt securities including up to 15% in "junk bonds". The
                        Fund may invest up to 25% of its assets in foreign
                        securities (not including its investments in ADRs).

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Credit Risk

                        . Derivatives Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


    0.84%      -1.49%     24.59%     22.02%     34.06%     35.44%     29.80%
    -----      ------     ------     ------     ------     ------     ------
    1993       1994       1995       1996       1997       1998       1999


During the period shown above the highest quarterly return was 25.02% for the
quarter ended 12/31/98 and the lowest was (11.84)% for the quarter ended
09/30/98.

Putnam Investment Management, Inc. became Sub-Adviser of the Fund on July 1,
1996. Performance before that date is based on the performance of the Fund's
previous Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending              Past           Past       Since Inception
December 31, 1999)               One Year     Five Years     (August 21, 1992)
- ------------------               --------     ----------     -----------------

  Fund Shares                      29.80%         29.06%                20.57%
  -----------                      ------         ------                ------

  S&P 500 Index*                   21.03%         28.55%                21.46%
  --------------                   ------         ------                ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


- -----------------------------
Allmerica Investment Trust
                                                                               9
<PAGE>

Objectives, Strategies and Risks


                                 Select Strategic Growth Fund
                                 ----------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: TCW Investment Management Company

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks long-term capital
                        appreciation.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To pursue its
                        investment objective, the Fund invests (except when
                        maintaining a temporary defensive position) at least 65%
                        of the value of its total assets in equity securities
                        issued by companies with market capitalization, at the
                        time of acquisition, within the capitalization range of
                        the companies comprising the Standard & Poor's Small Cap
                        600 Index.

                        In managing the Fund's investments, the Sub-Adviser
                        pursues a small cap growth investment philosophy. The
                        Sub-Adviser uses fundamental company-by-company analysis
                        in conjunction with technical and quantitative market
                        analysis to screen potential investments and to
                        continuously monitor securities in the Fund's portfolio.

                        The Fund focuses on small, fast-growing companies that
                        offer cutting-edge products, services or technologies.
                        Because these companies are often in their early stages
                        of development, their stocks tend to fluctuate more than
                        most other securities. The Fund may invest up to 25% of
                        its assets in foreign securities (not including its
                        investments in ADRs).

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Currency Risk

                        . Derivatives Risk

                        . Foreign Investment Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


                                    16.06%
                                    ------
                                     1999


During 1998 and the period shown above the highest quarterly return was 16.94%
for the quarter ended 12/31/98 and the lowest was (16.77)% for the quarter ended
9/30/98.

TCW Investment Management Inc. became Sub-Adviser of the Fund on April 1, 2000.
Performance before that date is based on the performance of the Fund's previous
Sub-Adviser.

Performance Table

Average Annual Total Returns
(for the periods ending                       Past         Since Inception
December 31, 1999)                          One Year     (February 20, 1998)
- ------------------                          --------     -------------------

  Fund Shares                                 16.06%             6.89%
  -----------                                 ------             -----

  S&P 500 Index*                              21.03%            21.80%
  --------------                              ------            ------


* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


                                                   -----------------------------
                                                     Allmerica Investment Trust
10
<PAGE>

Objectives, Strategies and Risks


                                Core Equity Fund
                                ----------------
                           (formerly the Growth Fund)

[GRAPHIC APPEARS HERE]  Sub-Adviser: Miller Anderson & Sherrerd, LLP

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to achieve
                        long-term growth of capital through investments
                        primarily in common stocks and securities convertible
                        into common stocks that are believed to represent
                        significant underlying value in relation to current
                        market prices. Realization of current income, if any, is
                        incidental to this objective.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To pursue its goal, the
                        Fund invests in securities that are diversified with
                        regard to issuers and industries. In selecting
                        securities, the Fund is not limited to any particular
                        style of investing and may invest in stocks considered
                        to be "growth" stocks as well as stocks considered to be
                        "value" stocks. The Fund may invest in well-established
                        or developing companies, both large and small.

                        The Fund normally will invest substantially all of its
                        assets in equity-type securities, including common
                        stocks, warrants, preferred stocks and debt securities
                        convertible into common stock and eligible real estate
                        securities. The Fund may invest up to 25% of its assets
                        in foreign securities (not including its investments in
                        ADRs).

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Derivatives Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."


The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                   1990...........................     -0.30%
                   1991...........................     40.44%
                   1992...........................      7.11%
                   1993...........................      6.66%
                   1994...........................      0.16%
                   1995...........................     32.80%
                   1996...........................     20.19%
                   1997...........................     25.14%
                   1998...........................     19.32%
                   1999...........................     29.33%

During the period shown above the highest quarterly return was 21.48% for the
quarter ended 12/31/98 and the lowest was (14.61)% for the quarter ended
9/30/90.

Performance Table

Average Annual Total Returns
(for the periods ending                Past          Past            Past
December 31, 1999)                     One Year      Five Years      Ten Years
- ------------------                     --------      ----------      ---------

Fund Shares                              29.33%          25.23%         17.31%
- -----------                              ------          ------         ------

S&P 500 Index*                           21.03%          28.55%         18.21%
- --------------                           ------          ------         ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


- -----------------------------
Allmerica Investment Trust
                                                                              11
<PAGE>

Objectives, Strategies and Risks


                                Equity Index Fund
                                -----------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to achieve
                        investment results that correspond to the aggregate
                        price and yield performance of a representative
                        selection of common stocks that are publicly traded in
                        the United States.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund tries to
                        achieve its objective by attempting to replicate the
                        aggregate price and yield performance of the S&P 500
                        Index. Because of its policy of tracking the S&P 500
                        Index, the Fund does not follow traditional methods of
                        active investment management, which involve buying and
                        selling securities based upon analysis of economic and
                        market factors. The method used to select investments
                        for the Fund involves investing in common stocks in
                        approximately the order of their weightings in the S&P
                        500 Index. Under normal circumstances, the Fund will
                        hold approximately 500 different stocks included in the
                        S&P 500 Index. The Fund will incur expenses that are not
                        reflected in the performance results of the S&P 500
                        Index. Therefore, the return of the Fund may be lower
                        than the return of the S&P 500 Index. These factors,
                        among others, may result in "tracking error", which is a
                        measure of the degree to which the Fund's results differ
                        from the results of the S&P 500 Index.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Derivatives Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                 1991..............................    29.16%
                 1992..............................     7.25%
                 1993..............................     9.53%
                 1994..............................     1.06%
                 1995..............................    36.18%
                 1996..............................    22.30%
                 1997..............................    32.41%
                 1998..............................    28.33%
                 1999..............................    20.41%


During the period shown above the highest quarterly return was 21.41% for the
quarter ended 12/31/98 and the lowest was (9.96)% for the quarter ended 9/30/98.

Performance Table
Average Annual Total Returns
(for the periods ending          Past        Past          Since Inception
December 31, 1999)               One Year    Five Years    (September 28, 1990)
- ------------------               --------    ----------    --------------------

Fund Shares                        20.41%        27.77%                  20.66%
- -----------                        ------        ------                  ------

S&P 500 Index*                     21.03%        28.55%                  21.35%
- --------------                     ------        ------                  ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.


                                                   -----------------------------
                                                     Allmerica Investment Trust

12
<PAGE>

Objectives, Strategies and Risks


                                  Select Growth and Income Fund
                                  -----------------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: J.P. Morgan Investment Management Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks a combination of
                        long-term growth of capital and current income. The Fund
                        will invest primarily in dividend-paying common stocks
                        and securities convertible into common stocks.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund invests in a
                        broadly diversified portfolio of equity securities,
                        primarily the common stock of companies included in the
                        S&P 500 Index. The Fund's industry diversification and
                        other risk characteristics will be similar to those of
                        the index. The Fund may invest in a wide range of equity
                        securities, consisting of common stocks, preferred
                        stocks, securities convertible into common and preferred
                        stocks and warrants. The Fund may purchase individual
                        stocks not presently paying dividends if the Sub-Adviser
                        believes the overall portfolio is positioned to achieve
                        its income objective.

                        The Fund may invest up to 35% of its assets in
                        fixed-income securities, including up to 15% in "junk
                        bonds". However, the Fund's normal strategy is to be
                        nearly fully invested in equity securities. The Fund may
                        also invest up to 25% of its assets in foreign
                        securities (not including its investments in ADRs).

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Derivatives Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns[GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


   10.37%      0.73%     30.32%     21.26%    22.51%     16.43%       18.43%
   ------      -----     ------     ------    ------     ------       ------
   1993        1994      1995       1996      1997       1998         1999


During the period shown above the highest quarterly return was 19.41% for the
quarter ended 12/31/98 and the lowest was (12.66)% for the quarter ended
9/30/98.

J.P. Morgan Investment Management Inc. became Sub-Adviser of the Fund on April
1, 1999. Performance before that date is based on the performance of the Fund's
previous Sub-Advisers.

Performance Table

Average Annual Total Returns
(for the periods ending              Past        Past       Since Inception
December 31, 1999)                 One Year   Five Years   (August 21, 1992)
- ------------------                 --------   ----------   -----------------

  Fund Shares                        18.43%       21.69%              15.92%
  -----------                        ------       ------              ------

  S&P 500 Index*                     21.03%       28.55%              21.46%
  --------------                     ------       ------              ------

* The S&P 500 Index(R), reflecting reinvestment of dividends, is an unmanaged
index of 500 leading stocks. S&P 500(R) Index is a registered trademark of
Standard & Poor's Corporation.

- -----------------------------
Allmerica Investment Trust
                                                                              13
<PAGE>


Objectives, Strategies and Risks

                       Select Investment Grade Income Fund
                       -----------------------------------
                   (formerly the Investment Grade Income Fund)

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks as high a level of
                        total return, which includes capital appreciation as
                        well as income, as is consistent with prudent investment
                        management.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To achieve its goal,
                        the Fund invests in investment grade debt securities and
                        money market instruments such as bonds and other
                        corporate debt obligations; obligations issued or
                        guaranteed by the U.S. Government, its agencies or
                        instrumentalities, or money market instruments,
                        including commercial paper, bankers acceptances and
                        negotiable certificates of deposit. The Fund also may
                        invest in mortgage-backed and asset-backed securities.
                        The Fund may invest up to 25% of its assets in foreign
                        securities (not including its investments in ADRs) and
                        up to 25% of its assets in debt obligations of
                        supranational entities.

                        Investment grade securities are rated in the four
                        highest grades by Moody's Investors Services or Standard
                        & Poor's Rating Services or unrated but determined by
                        the Sub-Adviser to be of comparable quality. For more
                        information about rating categories, see the Appendix to
                        the Statement of Additional Information ("SAI"). The
                        Fund may invest in securities with relatively long
                        maturities as well as securities with shorter
                        maturities.

                        The Sub-Adviser actively manages the portfolio with a
                        view to producing a high level of total return for the
                        Fund while avoiding undue risks to capital. The
                        Sub-Adviser attempts to anticipate events leading to
                        price or ratings changes through using in-depth
                        fundamental credit research.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Company Risk

                        . Interest Rate Risk

                        . Investment Management Risk

                        . Liquidity Risk

                        . Market Risk

                        . Prepayment Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]


                        1990 .................... 8.02%
                        1991 ....................16.75%
                        1992 .................... 8.33%
                        1993 ....................10.80%
                        1994 ....................-2.96%
                        1995 ....................17.84%
                        1996 .................... 3.56%
                        1997 .................... 9.45%
                        1998 .................... 7.97%
                        1999 ....................-0.97%


During the period shown above the highest quarterly return was 6.02% for the
quarter ended 6/30/95 and the lowest was (2.61)% for the quarter ended 3/31/94.


Performance Table
Average Annual Total Returns
(for the periods ending                     Past        Past          Past
December 31, 1999)                          One Year    Five Years    Ten Years
- ------------------                          --------    ----------    ---------

Fund Shares                                   -0.97%         7.38%        7.69%
- -----------                                   ------         -----        -----

Lehman Brothers
Aggregate Bond Index*                         -0.83%         7.73%        7.69%
- ---------------------                         ------         -----        -----

* The Lehman Brothers Aggregate Bond Index(R) is an unmanaged index of fixed
rate debt issues with an investment grade or higher rating at least one year to
maturity and an outstanding par value of at least $25 million.

                                                   -----------------------------
                                                     Allmerica Investment Trust
14
<PAGE>

Objectives, Strategies and Risks


                              Government Bond Fund
                              --------------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.


[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks high income,
                        preservation of capital, and maintenance of liquidity
                        primarily through investments in debt instruments issued
                        or guaranteed by the U.S. Government or its agencies or
                        instrumentalities ("U.S. Government securities") and in
                        related options, futures, and repurchase agreements.

                        Under normal conditions, at least 80% of the Fund's
                        assets will be invested in U.S. Government securities.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: To pursue its
                        objective, the Fund invests in U.S. Government
                        securities, such as Treasury bills, notes, and bonds,
                        which may differ only in their interest rates,
                        maturities and times of issuance. The Fund also may
                        invest in mortgage-backed government securities, other
                        instruments secured by U.S. Government securities,
                        asset-backed securities and separately-traded principal
                        and interest components of U.S. Treasury securities. The
                        Fund may invest up to 25% of its assets in debt
                        obligations of supranational entities.

                        The Sub-Adviser selects securities for the portfolio
                        with a view to producing a high level of current income
                        while avoiding undue risks to capital. The Fund may
                        invest in securities with relatively long maturities as
                        well as securities with shorter maturities.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Credit Risk

                        . Interest Rate Risk

                        . Investment Management Risk

                        . Market Risk

                        . Prepayment Risk

See "Description of Principal Investment Risks."


The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns [GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]

                 1992.................................      6.59%
                 1993.................................      7.51%
                 1994.................................     -0.88%
                 1995.................................     13.06%
                 1996.................................      3.51%
                 1997.................................      7.08%
                 1998.................................      7.67%
                 1999.................................      0.23%


During the period shown above the highest quarterly return was 4.32% for the
quarter ended 9/30/98 and the lowest was (1.49)% for the quarter ended
3/31/92.

Performance Table
Average Annual Total Returns
(for the periods ending           Past         Past            Since Inception
December 31, 1999)                One Year     Five Years     (August 26, 1991)
- ------------------                --------     ----------     -----------------

Fund Shares                          0.23%          6.22%                 6.16%
- -----------                          -----          -----                 -----

Lehman Brothers
Intermediate Government
Bond Index*                          0.50%          6.93%                 6.55%
- -----------                          -----          -----                 -----

*    The Lehman Brothers Intermediate Government Bond Index(R) is an unmanaged
     index of U.S. Government and Agency bonds with remaining maturities of one
     to ten years.

- -----------------------------
Allmerica Investment Trust
                                                                              15
<PAGE>

Objectives, Strategies and Risks


                                Money Market Fund
                                -----------------

[GRAPHIC APPEARS HERE]  Sub-Adviser: Allmerica Asset Management, Inc.

[GRAPHIC APPEARS HERE]  Investment Objective: The Fund seeks to obtain maximum
                        current income consistent with preservation of capital
                        and liquidity.

[GRAPHIC APPEARS HERE]  Principal Investment Strategies: The Fund seeks to
                        achieve its objective by investing in high quality money
                        market instruments such as obligations issued or
                        guaranteed by the United States Government, its
                        agencies, or instrumentalities; commercial paper;
                        obligations of banks or savings and loan associations
                        including bankers acceptances and certificates of
                        deposit; repurchase agreements and cash and cash
                        equivalents. The Fund may invest up to 25% of its assets
                        in U.S. dollar denominated foreign debt securities and
                        short-term instruments (not including investments in
                        ADRs).

                        Any security purchased for the Fund must receive the
                        highest or second highest quality rating by at least two
                        recognized rating agencies or by one if only one has
                        rated the security. If the security is unrated the
                        security must be seen by the Sub-Adviser as having
                        comparable quality. Portfolio securities will have a
                        remaining maturity of 397 days or less and the portfolio
                        is managed to maintain a dollar-weighted maturity of 90
                        days or less.

                        The Fund attempts to maintain a constant net asset value
                        of $1.00 per share but it may not be able to do so due
                        to adverse market conditions or other factors and it is
                        possible for investors to lose money by investing in the
                        Fund. An investment in the Fund is not a bank deposit
                        and is not insured or guaranteed by the Federal Deposit
                        Insurance Corporation or any other government agency.

[GRAPHIC APPEARS HERE]  Principal Risks:

                        . Credit Risk

                        . Interest Rate Risk

                        . Investment Management Risk

                        . Market Risk

See "Description of Principal Investment Risks."

The bar chart and table below do not reflect expenses at the insurance product
level, and if they did, the performance shown would have been lower.

            Calendar Year Annual Total Returns[GRAPHIC APPEARS HERE]

                            [BAR CHART APPEARS HERE]



      8.17%  6.22%  3.78%  3.00%  3.93%  5.84%  5.36%  5.47%  5.51%  5.19%
      -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
      1990   1991   1992   1993   1994   1995   1996   1997   1998   1999


During the period shown above the highest quarterly return was 2.01% for the
quarter ended 6/30/90 and the lowest was 0.73% for the quarter ended 6/30/93.

Performance Table

Average Annual Total Returns
(for the periods ending                        Past         Past        Past
December 31, 1999)                         One Year   Five Years   Ten Years
- ------------------                         --------   ----------   ---------

  Fund Shares                                 5.19%        5.47%       5.23%
  -----------                                 -----        -----       -----

  IBC/Donoghue First Tier
  Money Market Index*                         4.57%        4.97%       4.79%
  -------------------                         -----        -----       -----

* IBC/Donoghue is an independent firm that tracks regulated money market funds
on a yield, shareholder, assets size and portfolio allocation basis.

The Fund's 7-day yield ending December 31, 1999 was 5.57%.

7


                                                   -----------------------------
                                                   Allmerica Investment Trust
16
<PAGE>

                                 Expense Summary

Expenses are one of several factors to consider when investing in a Fund.
Expenses shown are based on expenses incurred in respect of shares of the Funds
for the 1999 fiscal year. The Examples show the cumulative expenses attributable
to a hypothetical $10,000 investment in each Fund over specified periods.

Fees and Expenses of the Funds

This table describes the fees and expenses that you may pay if you invest in the
Funds. Please note that the expenses listed below do not include the expenses of
the applicable variable insurance product that you are purchasing. You should
refer to the variable insurance product prospectus for more information relating
to the fees and expenses of that product, which are in addition to the expenses
of the Funds.

<TABLE>
<CAPTION>
                                                              Annual Fund Operating Expenses
                                          Shareholder      (expenses deducted from Fund assets)         Total Annual
                                             Fees                                                          Fund
                                     (fees paid directly       Management    Distribution    Other       Operating
                                     from your investment)        Fees       (12b-1) Fees   Expenses      Expenses
                                     ---------------------        ----       ------------   --------      --------
<S>                                  <C>                       <C>           <C>            <C>         <C>
Select Emerging Markets Fund                 None                 1.35%           None       0.57%       1.92%(1),(2)
Select Aggressive Growth Fund                None                 0.81%*          None       0.06%       0.87%(1),(2)*
Select Capital Appreciation Fund             None                 0.90%*          None       0.07%       0.97%(1),(2)*
Select Value Opportunity Fund                None                 0.90%(1)        None       0.07%       0.97%(1),(2)
Select International Equity Fund             None                 0.89%           None       0.13%       1.02%(1),(2)
Select Growth Fund                           None                 0.78%           None       0.05%       0.83%(1),(2)
Select Strategic Growth Fund                 None                 0.85%*          None       0.35%       1.20%(1),(2)
Core Equity Fund                             None                 0.43%           None       0.05%       0.48%(1),(2)
Equity Index Fund                            None                 0.28%           None       0.07%       0.35%(1)
Select Growth and Income Fund                None                 0.67%           None       0.07%       0.74%(1),(2)
Select Investment Grade Income Fund          None                 0.43%           None       0.07%       0.50%(1)
Government Bond Fund                         None                 0.50%           None       0.12%       0.62%(1)
Money Market Fund                            None                 0.24%           None       0.05%       0.29%(1)
</TABLE>



*      Effective September 1, 1999, the management fee rates for the Select
       Aggressive Growth Fund and Select Capital Appreciation Fund were revised.
       The Management Fee and Total Annual Fund Operating Expense ratios shown
       in the table above have been adjusted to assume that the revised rates
       took effect on January 1, 1999.

(1)    Through December 31, 2000, Allmerica Financial Investment Management
       Services, Inc. (the "Manager") has declared a voluntary expense
       limitation of 1.35% of average net assets for the Select Aggressive
       Growth Fund and Select Capital Appreciation Fund, 1.25% for the Select
       Value Opportunity Fund, 1.50% for the Select International Equity Fund,
       1.20% for the Select Growth Fund, Select Strategic Growth Fund and Core
       Equity Fund, 1.10% for the Select Growth and Income Fund, 1.00% for the
       Select Investment Grade Income Fund and Government Bond Fund, and 0.60%
       for the Money Market Fund. The total operating expenses of these Funds of
       the Trust were less than their respective expense limitations throughout
       1999 except the Select Strategic Growth Fund received a reimbursement of
       $813.00 in 1999 under its expense limitation.


- -----------------------------
Allmerica Investment Trust

                                                                              17
<PAGE>


       In addition through December 31, 2000, the Manager has agreed to
       voluntarily waive its management fee to the extent that expenses of the
       Select Emerging Markets Fund exceed 2.00% of the Fund's average daily net
       assets. The amount of such waiver shall not exceed the net amount of
       management fees earned by the Manager from the Fund after subtracting
       fees paid by the Manager to the Fund's Sub-Adviser.

       Through December 31, 2000, the Select Value Opportunity Fund's management
       fee rate has been voluntarily limited to an annual rate of 0.90% of
       average daily net assets.

       The declaration of a voluntary management fee or expense limitation in
       any year does not bind the Manager to declare future expense limitations
       with respect to these Funds. These limitations may be terminated at any
       time.

(2)    These Funds have entered into agreements with brokers whereby brokers
       rebate a portion of commissions. Had these amounts been treated as
       reductions of expenses, the total annual fund operating expense ratios
       would have been 1.88% for Select Emerging Market Fund, 0.88% for the
       Select Aggressive Growth Fund, 0.98% for the Select Capital Appreciation
       Fund, 0.88% for the Select Value Opportunity Fund, 1.01% for the Select
       International Equity Fund, 0.81% for the Select Growth Fund, 1.17% for
       the Select Strategic Growth Fund, 0.45% for the Core Equity Fund, and
       0.73% for the Select Growth and Income Fund.


Example

This Example is intended to help you compare the cost of investing in a Fund
with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in a Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. The
Example also assumes that your investment earns a 5% return each year and that
the Fund's operating expenses remain the same. Although your actual costs may be
higher or lower, based on these assumptions your costs would be:

<TABLE>
<CAPTION>
Fund                                          1 Year         3 Years        5 Years         10 Years
- ----                                          ------         -------        -------         --------
<S>                                           <C>            <C>            <C>             <C>
Select Emerging Markets Fund                   $197            $608          $1,046          $2,259
- ----------------------------                   ----            ----          ------          ------

Select Aggressive Growth Fund                   $93            $291            $506          $1,123
- -----------------------------                   ---            ----            ----          ------

Select Capital Appreciation Fund               $100            $314            $544          $1,206
- --------------------------------               ----            ----            ----          ------

Select Value Opportunity Fund                   $99            $310            $539          $1,194
- -----------------------------                   ---            ----            ----          ------

Select International Equity Fund               $105            $326            $566          $1,253
- --------------------------------               ----            ----            ----          ------

Select Growth Fund                              $85            $266            $462          $1,029
- ------------------                              ---            ----            ----          ------

Select Strategic Growth Fund                   $123            $383            $663          $1,461
- ----------------------------                   ----            ----            ----          ------

Core Equity Fund                                $49            $154            $269            $605
- ----------------                                ---            ----            ----            ----

Equity Index Fund                               $36            $113            $197            $444
- -----------------                               ---            ----            ----            ----

Select Growth and Income Fund                   $76            $237            $413            $921
- -----------------------------                   ---            ----            ----            ----

Select Investment Grade Income Fund             $51            $161            $280            $629
- -----------------------------------             ---            ----            ----            ----

Government Bond Fund                            $64            $199            $347            $776
- --------------------                            ---            ----            ----            ----

Money Market Fund                               $30             $93            $163            $369
- -----------------                               ---             ---            ----            ----
</TABLE>

                                                   -----------------------------
                                                   Allmerica Investment Trust
18
<PAGE>

               [GRAPHIC] Description of Principal Investment Risks

The following is a summary of the principal risks of investing in a Fund and the
factors likely to cause the value of your investment in the Fund to decline. The
principal risks applicable to each Fund are identified under "Fund Summaries".
There are also many factors that could cause the value of your investment in a
Fund to decline which are not described here. It is important to remember that
there is no guarantee that the Funds will achieve their investment objective,
and an investor in any of the Funds could lose money.

Company Risk

A Fund's equity and fixed income investments in a company often fluctuate based
on:

 . the firm's actual and anticipated earnings,

 . changes in management, product offerings and overall financial strength and

 . the potential for takeovers and acquisitions.

This is due to the fact that prices of securities react to the fiscal and
business conditions of the company that issued the securities. Factors affecting
a company's particular industry, such as increased production costs, also may
affect the value of its securities.

Smaller companies with market capitalizations of less than $1 billion or so are
more likely than larger companies to have limited products lines or smaller
markets for their goods and services. Small company stocks may not trade very
actively, and their prices may fluctuate more than stocks of other companies as
a result of lower liquidity. They may depend on a small or inexperienced
management group. Stocks of smaller companies also may be more vulnerable to
negative changes than stocks of larger companies.

Credit Risk

Credit risk is the risk that the issuer of a fixed income security will not be
able to pay principal and interest when due. There are different levels of
credit risk. Funds that invest in lower-rated securities have higher levels of
credit risk. Lower-rated or unrated securities of equivalent quality, generally
known as "junk bonds", have very high levels of credit risk. "Junk bonds" are
considered to be speculative in their capacity to pay interest and repay
principal. The price of a fixed income security can be expected to fall if the
issuer defaults on its obligation to pay principal or interest, the rating
agencies downgrade the issuer's credit rating or there is negative news that
affects the market's perception of the issuer's credit risk.

Currency Risk

This is the risk that the value of a Fund's investments may decline due to
fluctuations in exchange rates between the U.S. dollar and foreign currencies.
Funds that invest in securities denominated in or are receiving revenues in
foreign currencies are subject to currency risk. There is often a greater risk
of currency fluctuations and devaluations in emerging markets countries.

Derivatives Risk

A Fund may use derivatives to hedge against an opposite position that the Fund
also holds. While hedging can reduce or eliminate losses, it can also reduce or
eliminate gains. When a Fund uses derivatives to hedge, it takes the risk that
changes in the value of the derivative will not match those of the asset being
hedged. Incomplete correlation can result in unanticipated losses. A Fund may
also use derivatives as an investment vehicle to gain market exposure. Gains or
losses from derivative investments may be substantially greater than the
derivative's original cost. When a Fund uses derivatives, it is also subject to
the risk that the other party to the agreement will not be able to perform.
Additional risks associated with derivatives include mispricing and improper
valuation.


- -----------------------------
Allmerica Investment Trust

                                                                              19
<PAGE>

Emerging Markets Risk

Investments in emerging markets securities involve all of the risks of
investments in foreign securities, and also have additional risks. The markets
of developing countries have been more volatile than the markets of developed
countries with more mature economies. Many emerging markets companies in the
early stages of development are dependent on a small number of products and lack
substantial capital reserves. In addition, emerging markets often have less
developed legal and financial systems. These markets often have provided
significantly higher or lower rates of return than developed markets and usually
carry higher risks to investors than securities of companies in developed
countries.

Foreign Investment Risk


Investing in foreign securities involves risks relating to political, social and
economic developments abroad, as well as risks resulting from the differences
between the regulations to which U.S. and foreign issuers and markets are
subject. These risks may include the seizure by the government of company
assets, excessive taxation, withholding taxes on dividends and interest,
limitations on the use or transfer of portfolio assets, and political or social
instability. In the event of nationalization, expropriation or other
confiscation, a Fund could lose its entire investment. Funds investing in
foreign securities may experience rapid changes in value. One reason for this
volatility is that the securities markets of many foreign countries are
relatively small, with a limited number of companies representing a small number
of industries. Enforcing legal rights may be difficult, costly and slow in
foreign countries. Also, foreign companies may not be subject to governmental
supervision or accounting standards comparable to those applicable to U.S.
companies, and there may be less public information about their operations.


Interest Rate Risk

When interest rates rise, the prices of fixed income securities in a Fund's
portfolio will generally fall. Conversely, when interest rates fall, the prices
of fixed income securities in the Fund's portfolio will generally rise. Even
Funds that invest in the highest quality debt securities are subject to interest
rate risk. Interest rate risk usually will affect the price of a fixed income
security more if the security has a longer maturity because changes in interest
rates are increasingly difficult to predict over longer periods of time. Fixed
income securities with longer maturities will therefore be more volatile than
other fixed income securities with shorter maturities.

Investment Management Risk

Investment management risk is the risk that a Fund does not achieve its
investment objective, even though the Sub-Adviser uses various investment
strategies and techniques.

Liquidity Risk

This is the risk that a Fund will not be able to sell a security at a reasonable
price because there are too few people who actively buy and sell, or trade, that
security on a regular basis. Liquidity risk increases for Funds investing in
foreign investments (especially emerging markets securities), smaller companies,
lower credit quality bonds (also called "junk bonds"), restricted securities,
over-the-counter securities and derivatives.

Market Risk

This is the risk that the price of a security held by a Fund will fall due to
changing economic, political or market conditions or to factors affecting
investor psychology.

Prepayment Risk

While mortgage-backed securities may have a stated maturity, their expected
maturities may vary when interest rates rise or fall. When interest rates fall,
homeowners are more likely to prepay their mortgage loans which may result in an
unforeseen loss of future interest income to a Fund. Also, because prepayments
increase when interest rates fall, the prices of mortgage-backed securities do
not increase as much as other fixed income securities when interest rates fall.


                                                   -----------------------------
                                                   Allmerica Investment Trust
20
<PAGE>

                      [GRAPHIC] Other Investment Strategies

The Fund Summaries starting on page 3 describe the investment objective and the
principal investment strategies and risks of each Fund. The Funds may at times
use the following investment strategies. Attached as an Appendix is a chart with
a listing of various investment techniques and strategies that the Sub-Advisers
of the Funds may utilize. A Fund may decide that it is in the best interests of
shareholders to make changes to its investment objective and strategies
described in this Prospectus. These investment objectives and strategies may be
changed with the approval of the Board of Trustees, but without shareholder
approval.

Derivative Investments. (applicable to each Fund except the Money Market Fund)
Instead of investing directly in the types of portfolio securities described in
the Summary, each Fund, except the Money Market Fund, may buy or sell a variety
of "derivative" investments to gain exposure to particular securities or
markets. Derivatives are financial contracts whose value depends on, or is
derived from, the value of an underlying asset, reference rate or index. A
Fund's Sub-Adviser will sometimes use derivatives as part of a strategy designed
to reduce other risks and sometimes will use derivatives to enhance returns,
which increases opportunities for gain but also involves greater risk.

Foreign Investments. (applicable to each Fund except the Government Bond Fund)
Each Fund, except the Government Bond Fund, may invest all or a substantial part
of its portfolio in securities of companies that are located or primarily doing
business in a foreign country. A company is considered to be located in a
foreign country if it is organized under the laws of, or has a principal office
in, that country. A company is considered as primarily doing business in a
country if (i) the company derives at least 50% of its gross revenues or profits
from either goods or services produced or sold in the country or (ii) at least
50% of the company's assets are situated in the country. A Fund may invest in
foreign securities either directly or indirectly through the use of depositary
receipts, such as ADRs. Depositary receipts are generally issued by banks or
trust companies and evidence ownership of underlying foreign securities. An ADR
may be sponsored by the issuer of the underlying foreign security or it may be
issued in unsponsored form. The holder of a sponsored ADR is likely to receive
more frequent and extensive financial disclosure concerning the foreign issuer
than the holder of an unsponsored ADR and generally will bear lower transaction
charges. The Select Capital Appreciation Fund and Select International Equity
Fund may also purchase foreign securities through European Depositary Receipts
and Global Depositary Receipts.

High Yield Securities. (applicable to the Select Emerging Markets Fund, Select
Capital Appreciation Fund, Select Growth Fund and Select Growth and Income Fund)
The Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
Growth Fund and Select Growth and Income Fund may purchase corporate debt
securities which are high yield securities, or "junk bonds" (rated at the time
of purchase BB or lower by Moody's or S&P, or equivalently rated by another
rating agency, or unrated but believed by the Sub-Adviser to have similar
quality.) These securities are considered to be speculative in their capacity to
pay interest and repay principal.


- -----------------------------
Allmerica Investment Trust

                                                                              21
<PAGE>

Lending of Securities. (applicable to all Funds) To realize additional income,
the Funds may lend portfolio securities to broker-dealer or financial
institutions in an amount up to 33-1/3% of a Fund's total assets. While any such
loan is outstanding, a Fund will continue to receive amounts equal to the
interest or dividends paid by the issuer on the securities, as well as interest
(less any rebates to be paid to the borrower) on the investment of the
collateral or a fee from the borrower. Each Fund will have the right to call
each loan and obtain the securities. Lending portfolio securities involves
possible delays in receiving additional collateral or in the recovery of the
securities or possible loss of rights in the collateral.

Restricted Securities. (applicable to all Funds) The Funds may purchase
securities that are not registered under Federal securities law ("restricted
securities"), but can be offered and sold to certain "qualified institutional
buyers". Each Fund will not invest more than 15% (10% for the Money Market Fund)
of its net assets in restricted securities (and securities deemed to be
illiquid). These limits do not apply if the Board of Trustees determines that
the restricted securities are liquid. The Board of Trustees has adopted
guidelines and delegated to the Manager the daily function of determining and
monitoring the liquidity of restricted securities. The Board, however, retains
sufficient oversight and is ultimately responsible for the determinations. This
investment practice could increase the level of illiquidity in a Fund if buyers
lose interest in restricted securities. As a result, a Fund might not be able to
sell these securities when its Sub-Adviser wants to sell, or might have to sell
them at less than fair value. In addition, market quotations for these
securities are less readily available.

Temporary Defensive Strategies. At times a Sub-Adviser may determine that market
conditions make it desirable temporarily to suspend a Fund's normal investment
activities. This is when the Fund may temporarily invest in a variety of
lower-risk securities, such as U.S. Government and other high quality bonds and
short-term debt obligations. Such strategies attempt to reduce changes in the
value of the Fund's shares. The Fund may not achieve its investment objective
while these strategies are in effect.

Frequent Trading. Certain Funds from time to time may engage in active and
frequent trading to achieve their investment objective. Frequent trading
increases transaction costs, which could detract from the Fund's performance.


                                                   -----------------------------
                                                   Allmerica Investment Trust

22
<PAGE>

                        [GRAPHIC] Management of the Funds

The Trust is governed by a Board of Trustees. Allmerica Financial Investment
Management Services, Inc. is the investment Manager of the Trust responsible for
managing the Trust's day-to-day business affairs. The Manager is located at 440
Lincoln Street, Worcester, MA 01653. The Manager and its predecessor, Allmerica
Investment Management Company, Inc., have been managing mutual funds since 1985.
The Manager currently serves as investment manager to one other mutual fund.
Sub-Advisers have been hired to manage the investments of the Funds. The Trust
and Manager have obtained an order of exemption from the SEC that permits the
Manager to enter into and materially amend sub-advisory agreements with
non-affiliated Sub-Advisers without obtaining shareholder approval. The Manager
has ultimate responsibility to oversee Sub-Advisers. The Manager has the
ability, subject to approval of the Trustees, to hire and terminate Sub-Advisers
and to change materially the terms of the Sub-Adviser Agreements, including the
compensation paid to the Sub-Advisers. The Sub-Advisers have been selected by
the Manager and Trustees with the help of BARRA RogersCasey, Inc., a pension
consulting firm. The fees earned by each Sub-Adviser and BARRA RogersCasey are
paid by the Manager. The performance by the Sub-Advisers is reviewed quarterly
by a committee of the Board of Trustees, with assistance from BARRA RogersCasey.

The following table provides information about each Fund's Sub-Adviser:

<TABLE>
<CAPTION>
       Fund Name,
Sub-Adviser Name and Address                                         Experience
- ----------------------------                                         ----------
<S>                                                    <C>
Select Emerging Markets Fund                           Organized in 1980 and has approximately $47 billion assets
Schroder Investment Management                         under management as of December 31, 1999.
North America Inc.                                     Provides global equity and fixed income
787 Seventh Avenue                                     management services to mutual funds and
New York, NY 10019                                     other institutional investors.
- ------------------                                     ------------------------------

Select Aggressive Growth Fund                          Has over $41 billion assets under management as of December
Nicholas-Applegate Capital Management, L.P.            31, 1999. Founded in 1984. Clients include employee benefit
600 West Broadway, Suite 2900                          and retirement plans, foundations, investment companies and
San Diego, CA 92101                                    individuals.
- -------------------                                    ------------

Select Capital Appreciation Fund                       Manages with its affiliates assets totaling $179.9 billion as
T. Rowe Price Associates, Inc.                         of December 31, 1999 for eight million individual and
100 East Pratt Street                                  institutional investor accounts.
Baltimore, MD 21202                                    Founded in 1937.
- -------------------                                    ----------------

Select Value Opportunity Fund                          Established in 1973. Over $3.2 billion assets under
Cramer Rosenthal McGlynn, LLC                          management as of December 31, 1999. Provides investment
707 Westchester Avenue                                 advice to mutual funds, individuals, government agencies,
White Plains, NY 10604                                 pension plans and trusts.
- ----------------------                                 -------------------------
</TABLE>

- -----------------------------
Allmerica Investment Trust
                                                                              23
<PAGE>

<TABLE>
<CAPTION>
         Fund Name,
  Sub-Adviser Name and Address                                                  Experience
  ----------------------------                                                  ----------
<S>                                                      <C>
Select International Equity Fund                         Managed over $50 billion in global securities as of December
Bank of Ireland Asset Management (U.S.) Ltd.             31, 1999. Founded in 1966. Provides international investment
26 Fitzwilliam Place, Dublin 2,                          management services.
Ireland and  20 Horseneck Lane
Greenwich, CT 06830
- -------------------

Select Growth Fund                                       As of December 31, 1999, $391 billion assets under
Putnam Investment Management, Inc.                       management, including affiliates. Investment manager of
One Post Office Square                                   mutual funds and other clients since 1937.
Boston, MA 02109
- ----------------

Select Strategic Growth Fund                             Had over $70 billion in assets under management or
TCW Investment Management Company                        committed to management as of December 31, 1999.
865 South Figueroa Street, Suite 1800                    Established  in  1971.  Manages pension and profit sharing
Los Angeles, CA  90017                                   funds, retirement/health and welfare funds, public employee
- ----------------------                                   retirement funds, and private accounts.

Core Equity Fund                                         Organized in 1969, and is now a division of Morgan Stanley
Miller Anderson & Sherrerd, LLP                          Dean Witter Investment Management ("MSDWIM"). Provides
One Tower Bridge                                         investment advisory services to employee benefit plans, endowment funds,
West Conshohocken, PA 19428                              foundations and other institutional investors. MSDWIM had $184
- ---------------------------                              billion in assets under management as of December 31, 1999.
                                                         -----------------------------------------------------------

Equity Index Fund                                        Incorporated in 1993. Had $13.3 billion in assets under
Allmerica Asset Management, Inc.                         management as of December 31, 1999. Serves as investment
440 Lincoln Street                                       adviser to investment companies and affiliated insurance
Worcester, MA 01653                                      company accounts
- -------------------                                      ----------------

Select Growth and Income Fund                            Incorporated in 1984. With affiliates, approximately $349 billion
J.P. Morgan Investment Management Inc.                   assets under management as of December 31, 1999. Serves as
522 Fifth Avenue                                         investment adviser for employee benefit plans and other
New York, NY 10036                                       institutional assets, as well as mutual funds and variable
- ------------------                                       annuities.
                                                         ----------

Select Investment Grade Income Fund                      See Equity Index Fund above.
Allmerica Asset Management, Inc.
440 Lincoln Street
Worcester, MA 01653
- -------------------

Government Bond Fund                                     See Equity Index Fund above
Allmerica Asset Management, Inc.
440 Lincoln Street
Worcester, MA 01653
- -------------------

Money Market Fund                                        See Equity Index Fund above
Allmerica Asset Management, Inc.
440 Lincoln Street
Worcester, MA 01653
- --------------------
</TABLE>

                                               -----------------------------
                                               Allmerica Investment Trust

24
<PAGE>

For a sample listing of certain of the Sub-Advisers' clients, see "Investment
Management and Other Services" in the SAI.

The following individuals or groups of individuals are primarily responsible for
the day-to-day management of the Funds' portfolios:

<TABLE>
<CAPTION>
        Fund Name and                      Name and Title of            Service with          Business Experience
      Sub-Adviser Name                   Portfolio Manager(s)            Sub-Adviser          for Past Five Years
      ----------------                   --------------------            -----------          -------------------
<S>                                 <C>                                <C>               <C>
Select Emerging Markets Fund        John A. Troiano, Director,         1981 - Present    Director of Schroder with
Schroder Investment Management      Chief Executive and Chairman                         responsibility for policy for
North America Inc. ("Schroder")     of Emerging Markets Committee                        emerging markets.

                                    Mark Bridgeman,                    1990 - Present    Fund Manager specializing in
                                    First Vice President                                 African markets.

                                    Heather F. Crighton, Director      1993 - Present    Fund Manager specializing in
                                    and Senior Vice President                            Asian emerging markets.
                                                                                         -----------------------

Select Aggressive Growth Fund       Lawrence S. Speidell, Partner      1994 - Present    Director of Global/Systematic
Nicholas-Applegate Capital                                                               Portfolio Management and
Management, L.P. ("NACM")                                                                Research at NACM. Prior
                                                                                         to joining NACM, he spent
                                                                                         ten years with Batterymarch
                                                                                         Financial Management.

                                    John J. Kane, Partner              1994 - Present    Senior Portfolio Manager for
                                                                                         the U.S. Systematic portfolios
                                                                                         at NACM.  Prior to joining
                                                                                         NACM in 1994, he was
                                                                                         employed by ARCOInvest-
                                                                                         Management Company and General
                                                                                         Electric.

                                    Mark W. Stuckelman,                1995 - Present    Portfolio Manager for the
                                    Portfolio Manager                                    U.S. Systematic portfolios
                                                                                         at NACM. Prior to joining
                                                                                         NACM, he was employed for
                                                                                         five years with Wells Fargo
                                                                                         Bank, Fidelity Management
                                                                                         Trust Co., and BARRA, Inc.
                                                                                         --------------------------

Select Capital Appreciation Fund    Brian W.H. Berghuis,               1985 - Present    He has sixteen years
T. Rowe Price Associates, Inc.      Chartered Financial Analyst                          experience in equity research
("T. Rowe Price")                                                                        and portfolio management.
                                                                                         He is chairman of the investment
                                                                                         team for the Fund.

                                    John F. Wakeman, Research          1989 - Present    He spent ten years with
                                    Analyst & Portfolio Manager                          T. Rowe Price as a research
                                                                                         analyst and portfolio manager
                                                                                         and has twelve  years' experience
                                                                                         in equity research.
                                                                                         -------------------
</TABLE>

- -----------------------------
Allmerica Investment Trust

                                                                              25
<PAGE>

<TABLE>
<CAPTION>
        Fund Name and                      Name and Title of           Service with          Business Experience
      Sub-Adviser Name                   Portfolio Manager(s)           Sub-Adviser          for Past Five Years
      ----------------                   --------------------           -----------          -------------------
<S>                                 <C>                               <C>               <C>
Select Capital Appreciation Fund    Marc L. Baylin, Chartered         1993 - Present    He has eight years of
continued                           Financial Analyst                                   investment experience in
                                                                                        equity research and has been
                                                                                        with T. Rowe Price for the past
                                                                                        six years as a research analyst
                                                                                        and portfolio manager.
                                                                                        ---------------------

Select Value Opportunity Fund       Ronald H. McGlynn, CEO and        1973 - Present    He joined Cramer Rosenthal
Cramer Rosenthal McGlynn,           President of Cramer Rosenthal                       in 1973, has 29 years of
LLC ("Cramer Rosenthal")                                                                investment experience and
                                                                                        serves as Co-Chief Investment
                                                                                        Officer and Portfolio Manager.

                                    Jay B. Abramson, Executive        1985 - Present    He has been with Cramer
                                    Vice President and Director                         Rosenthal since 1985 and his
                                    of Research and Co-Chief                            overall responsibility is for
                                    Investment Officer                                  investment research.
                                    ------------------                                  --------------------

Select International Equity Fund    Christopher Reilly,               1980 - Present    Since 1985, he has had
Bank of Ireland Asset Management    Chief Investment Officer                            overall responsibility for asset
(U.S.) Limited ("BIAM")                                                                 management. He previously
                                                                                        worked in the United
                                                                                        Kingdom in stockbrokering
                                                                                        and investment management.

                                    Michael McCarthy,                 1997 - Present    Mr. McCarthy rejoined BIAM
                                    Portfolio Manager                                   in 1997 from a major life assurance
                                                                                        Company where he was Head of
                                                                                        Asset Management. Prior to this, he
                                                                                        worked for BIAM in the U.K. in a
                                                                                        senior portfolio management capacity.

                                    Peter Wood, Senior                1985 - Present    Prior to 1985, he spent five
                                    Portfolio Manager                                   years with another leading
                                                                                        investment management firm.
                                                                                        He is now responsible for
                                                                                        portfolio construction at BIAM.

                                    Jane Neill, Senior Equity Analyst 1994 - Present    Previously, she was Chief
                                                                                        Investment Officer with
                                                                                        another leading Irish investment
                                                                                        management firm.
                                                                                        ----------------
</TABLE>

                                                   -----------------------------
                                                   Allmerica Investment Trust
26
<PAGE>

<TABLE>
<CAPTION>
        Fund Name and                      Name and Title of           Service with         Business Experience
      Sub-Adviser Name                   Portfolio Manager(s)           Sub-Adviser         for Past Five Years
      ----------------                   --------------------           -----------         -------------------
<S>                                 <C>                               <C>              <C>
Select Growth Fund                  C. Beth Cotner, CFA,              1995 - Present   Prior to 1995, Ms. Cotner was
Putnam Investment                   Chief Investment Officer                           Executive Vice President at
Management, Inc. ("Putnam")                                                            Kemper Financial Services.

                                    Manuel Weiss, CFA,                1987 - Present   He has been an investment
                                    Senior Vice President                              professional with Putnam
                                                                                       since 1987.

Select Strategic Growth Fund        Christopher J. Ainley, Managing   1994 - Present   Prior to joining TCW, Mr. Ainley
TCW Investment Management           Director                                           spent 2 years at Putnam Investments
Company ("TCW")                                                                        as a Vice President and Analyst in
                                                                                       the Equity Research Group and then as
                                                                                       a Portfolio Manager for the Core Equity
                                                                                       Group. Previously he served with J.P.
                                                                                       Morgan Investment Management and Coopers
                                                                                       and Lybrand.

                                    Douglas S. Foreman,               1994 - Present   Prior to 1994, Mr. Foreman
                                    Group Managing Director &                          was employed by Putnam
                                    Chief Investment Officer -                         Investment in Boston. He spent
                                    U.S. Equities                                      his last 5 years at Putnam managing
                                                                                       Institutional accounts and mutual
                                                                                       Funds. Mr. Foreman is a Chartered
                                                                                       Financial Analyst.

                                    Charles Larsen                    1984 - Present   Prior to TCW, Mr. Larsen
                                    Managing Director                                  was a Senior Vice President and
                                                                                       Portfolio Manager for CIGNA
                                                                                       Investment Management Company.
                                                                                       He is a Chartered Financial Analyst and
                                                                                       Chartered Investment Counselor.
                                                                                       ------------------------------

Core Equity Fund                    Gary G. Schlarbaum,               1987 - Present   He has served on a committee
Miller Anderson & Sherrerd, LLP     CFA and Managing Director                          of fund managers since 1993.
("MAS")                                                                                Prior to 1987, Mr. Schlarbaum was
                                                                                       employed by First Chicago
                                                                                       Investment Advisors from 1984 -
                                                                                       1987.

                                    Robert J. Marcin,                 1988 - Present   Prior to joining MAS in 1988,
                                    CFA and Managing Director                          Mr. Marcin was an Account
                                                                                       Executive at Smith Barney Harris
                                                                                       Upham and Company, Inc.
</TABLE>

- -----------------------------
Allmerica Investment Trust
                                                                              27
<PAGE>

<TABLE>
<CAPTION>
      Fund Name and                        Name and Title of           Service with         Business Experience
      Sub-Adviser Name                   Portfolio Manager(s)           Sub-Adviser         for Past Five Years
      ----------------                   --------------------           -----------         -------------------
<S>                                 <C>                               <C>               <C>
 Core Equity Fund continued         Brian Kramp,                      1997 - Present    Mr. Kramp was employed
                                    CFA and Vice President                              as an analyst and portfolio
                                                                                        manager by Meridian Investment
                                                                                        Company from 1985  - 1997.

                                    James J. Jolinger, Principal      1994 - Present    He has served on the fund
                                                                                        managers committee since 1997.
                                                                                        Prior to 1994, Mr. Jolinger was
                                                                                        employed by Oppenheimer Capital as
                                                                                        an Equity Analyst from 1987 to
                                                                                        1994.

                                    Arden C. Armstrong,               1986 - Present    Prior to joining MAS,
                                    CFA and Managing Director                           Ms. Armstrong was employed
                                                                                        by Evans Economics, Inc.

                                    Chris Leavy,                      1997 - Present    Prior to joining MAS, Mr. Leavy
                                    CFA and Vice President                              was employed by Capitoline
                                                                                        Investment Services as a portfolio
                                                                                        Manager from 1995-1997.

                                    Steven Epstein,                   1996 - Present    Prior to joining MAS, Mr. Epstein
                                    Vice President                                      attended the Wharton School,
                                                                                        University of Pennsylvania from
                                                                                        1994-1996, receiving an MBA.

                                    Eric F. Scharpf,                  1997 - Present    Prior to joining MAS, Mr. Scharpf
                                    Vice President                                      attended the Wharton School,
                                                                                        University of Pennsylvania from
                                                                                        1995-1997 receiving an MBA, and
                                                                                        served as a Financial Analyst for
                                                                                        Salomon Brothers from 1993-1995.
                                                                                        --------------------------------

Select Growth and Income Fund       Bernard A. Kroll, Vice President  1996 - Present    Prior to joining J.P. Morgan
J.P. Morgan Investment                                                                  in 1996, Mr. Kroll was an
Management Inc. ("J.P. Morgan")                                                         equity derivatives specialist
                                                                                        at Goldman Sachs & Co.,
                                                                                        founded his own software
                                                                                        development firm and options
                                                                                        broker-dealer, and managed
                                                                                        several derivatives businesses
                                                                                        at Kidder, Peabody & Co.
                                                                                        He is a portfolio manager in
                                                                                        the Structured Equity Group.

                                    Timothy J. Devlin, Vice President 1996 - Present    Prior to joining J.P. Morgan
                                                                                        in 1996, Mr. Devlin was an
                                                                                        equity portfolio manager at
                                                                                        Mitchell Hutchins Asset
                                                                                        Management Inc. He is a
                                                                                        portfolio manager in the
                                                                                        Structured Equity Group.

                                    James C. Wiess, Vice President    1992 - Present    He is a portfolio manager in
                                                                                        the Structured Equity Group
                                                                                        and has been at J.P. Morgan
                                                                                        since 1992.
                                                                                        -----------
</TABLE>
                                                -----------------------------
                                                Allmerica Investment Trust
28
<PAGE>

<TABLE>
<CAPTION>
        Fund Name and                                 Name and Title of                 Service with       Business Experience
      Sub-Adviser Name                               Portfolio Manager(s)               Sub-Adviser        for Past Five Years
      ----------------                               --------------------               -----------        -------------------
<S>                                             <C>                                   <C>              <C>
Select Investment Grade Income Fund             Ann K. Tripp,                         1987 - Present   She was a Portfolio Manager
 Allmerica Asset Management, Inc. ("AAM")                                                              Vice President for AAM prior
                                                                                                       to becoming a Vice President.
                                                                                                       ----------------------------

Government Bond Fund                            Richard J. Litchfield,                1995 - Present   He was a mortgage-backed
Allmerica Asset Management, Inc.                CFA and Vice President                                 securities analyst and trader
("AAM")                                                                                                at Keystone Investments, Inc.
                                                                                                       prior to joining AAM.
                                                                                                       ---------------------

Equity Index Fund and                           John C. Donohue, Vice President       1995 - Present   He was a portfolio manager
Money Market Fund                                                                                      at CS First Boston Investment
Allmerica Asset Management, Inc.                                                                       Management prior to joining
("AAM")                                                                                                AAM.
- -------                                                                                                ----
</TABLE>

- -----------------------------
Allmerica Investment Trust
                                                                              29
<PAGE>


For the fiscal year ended December 31, 1999, the Funds paid the Manager the fees
shown in the table below:

<TABLE>
<CAPTION>
                                                                                          Fee (as a percentage of
        Fund                                                                                  average net assets)
        ----                                                                                  -------------------
        <S>                                                                               <C>
        Select Emerging Markets Fund                                                                    1.35%
        ----------------------------                                                                    -----

        Select Aggressive Growth Fund                                                                   0.85%
        -----------------------------                                                                   -----

        Select Capital Appreciation Fund                                                                0.91%
        --------------------------------                                                                -----

        Select Value Opportunity Fund                                                                   0.90%
        -----------------------------                                                                   -----

        Select International Equity Fund                                                                0.89%
        --------------------------------                                                                -----

        Select Growth Fund                                                                              0.78%
        ------------------                                                                              -----

        Select Strategic Growth Fund                                                                    0.85%
        ----------------------------                                                                    -----

        Growth Fund (renamed the Core Equity Fund)                                                      0.43%
        ------------------------------------------                                                      -----

        Equity Index Fund                                                                               0.28%
        -----------------                                                                               -----

        Select Growth and Income Fund                                                                   0.67%
        -----------------------------                                                                   -----

        Investment Grade Income Fund (renamed the Select Investment Grade Income Fund)                  0.43%
        ------------------------------------------------------------------------------                  -----

        Government Bond Fund                                                                            0.50%
        --------------------                                                                            -----

        Money Market Fund                                                                               0.24%
        -----------------                                                                               -----
</TABLE>


  For the fiscal year ended December 31, 1999, the Manager paid each Sub-Adviser
  aggregate fees as set forth below:

<TABLE>
<CAPTION>
                                                                                                            Fee (as a percentage of
Sub-Adviser                                                                                                     average net assets)
- -----------                                                                                                     ------------------
<S>                                                                                                         <C>
Schroder Investment Management North America Inc. (Select Emerging Markets Fund)                                             1.00%
- --------------------------------------------------------------------------------                                             -----

Nicholas-Applegate Capital Management, L.P. (Select Aggressive Growth Fund)                                                  0.48%
- ---------------------------------------------------------------------------                                                  -----

T. Rowe Price Associates, Inc. (Select Capital Appreciation Fund)                                                            0.46%
- -----------------------------------------------------------------                                                            -----

Cramer Rosenthal McGlynn, LLC (Select Value Opportunity Fund)                                                                0.52%
- -------------------------------------------------------------                                                                -----

Bank of Ireland Asset Management (U.S.) Limited (Select International Equity Fund)                                           0.30%
- ----------------------------------------------------------------------------------                                           -----

Putnam Investment Management, Inc. (Select Growth Fund)                                                                      0.27%
- -------------------------------------------------------                                                                      -----

Cambiar Investors, Inc.* (Select Strategic Growth Fund)                                                                      0.50%
- --------------------------------------------------------                                                                     -----

Miller Anderson & Sherrerd, LLP (Growth Fund - renamed the Core Equity Fund)                                                 0.21%
- ----------------------------------------------------------------------------                                                 -----

Allmerica Asset Management, Inc. (Equity Index Fund)                                                                         0.09%
- ----------------------------------------------------                                                                         -----

J.P. Morgan Investment Management Inc. ** (Select Growth and Income Fund)                                                    0.26%
- -------------------------------------------------------------------------                                                    -----

Allmerica Asset Management, Inc. (Investment Grade Income Fund - renamed the Select Investment Grade Income Fund)            0.20%
- -----------------------------------------------------------------------------------------------------------------            -----

Allmerica Asset Management, Inc. (Government Bond Fund)                                                                      0.18%
- -------------------------------------------------------                                                                      -----

Allmerica Asset Management, Inc. (Money Market Fund)                                                                         0.09%
- ----------------------------------------------------                                                                         -----
</TABLE>
                                                   -----------------------------
                                                   Allmerica Investment Trust
30
<PAGE>



*    TCW replaced Cambiar Investors, Inc. ("Cambiar") as Sub-Adviser of the
     Select Strategic Growth Fund on April 1, 2000. Cambiar served as Sub-
     Adviser of the Select Strategic Growth Fund from February 20, 1998 to March
     31, 2000. Cambiar received a fee computed daily at an annual rate based on
     the average net assets of the Select Growth and Income Fund, based on the
     following schedule:

    Assets                                                    Rate
    ------                                                    ----

    First $50 Million                                         0.50%
    -----------------                                         -----

    Next $100 Million                                         0.45%
    -----------------                                         -----

    Next $100 Million                                         0.35%
    -----------------                                         -----

    Next $100 Million                                         0.30%
    -----------------                                         -----

    Over $350 Million                                         0.25%
    -----------------                                         -----

TCW receives a fee computed daily at an annual rate of 0.85% based on the
average daily net assets of the Select Strategic Growth Fund. When the average
daily net assets of the Fund exceed $100 million, the fee shall be computed
daily and paid quarterly at an annual rate of 0.75% of the total average daily
net assets of the Fund.

**   J.P. Morgan Investment Management Inc. ("J.P. Morgan") replaced John A.
     Levin & Co., Inc. ("Levin") as Sub-Adviser of the Select Growth and Income
     Fund on April 1, 1999. Levin served as Sub-Adviser of the Select Growth and
     Income Fund from September 1, 1994 to March 31, 1999. Levin received a fee
     computed daily at an annual rate based on the average daily net assets of
     the Select Growth and Income Fund, based on the following schedule:

    Assets                                                    Rate
    ------                                                    ----

    First $100 Million                                        0.40%
    ------------------                                        -----

    Next $200 Million                                         0.25%
    -----------------                                         -----

    Over $300 Million                                         0.30%
    -----------------                                         -----

J.P. Morgan receives a fee computed daily at an annual rate based on the average
daily net assets of the Select Growth and Income Fund, based on the following
schedule:

    Assets                                                    Rate
    ------                                                    ----

    First $500 Million                                        0.30%
    ------------------                                        -----

    Next $500 Million                                         0.25%
    -----------------                                         -----

    Over $1 Billion                                           0.20%
    ---------------                                           -----


- -----------------------------
Allmerica Investment Trust
                                                                              31
<PAGE>

                             Pricing of Fund Shares

The Funds sell and redeem their shares at a price equal to their net asset value
("NAV") without paying any sales or redemption charges. The NAV of a share is
computed by adding the current value of all the Fund's assets, subtracting its
liabilities and dividing by the number of its outstanding shares. NAV is
computed once daily at the close of regular trading on the New York Stock
Exchange each day the Exchange is open - normally 4:00 p.m. Eastern Time. Orders
for the purchase or redemption of shares are filled at the next NAV computed
after an order is received by the Fund. The Funds do not accept orders or
compute their NAV's on days when the Exchange is closed.


Equity securities are valued based on market value if market quotations are
readily available. Debt securities (other than short-term obligations) normally
are valued based on pricing service valuations. All securities of the Money
Market Fund are valued at amortized cost. Debt obligations in the other Funds
with a remaining maturity of 60 days or less are valued at amortized cost when
amortized cost is considered to represent fair value. Values for short-term
obligations of the other Funds having a remaining maturity of more than 60 days
are based upon readily available market quotations. In other cases, debt and
equity securities and any other assets are valued at their fair value following
procedures approved by the Trustees.

Certain foreign markets may be open on days when the Funds do not accept orders
or price their shares. As a result, the NAV of a Fund's shares may change on
days when shareholders will not be able to buy or sell shares.

                        Purchase and Redemption of Shares

Shares of the Funds currently are purchased only by Separate Accounts which are
the funding mechanisms for variable annuity contracts and variable life
insurance policies. The Distributor, Allmerica Investments, Inc., at its
expense, may provide promotional incentives to dealers who sell variable annuity
contracts which invest in the Funds. The Trust has obtained an exemptive order
from the Securities and Exchange Commission to permit Fund shares to be sold to
variable annuity and variable life insurance separate accounts of both
affiliated and unaffiliated life insurance companies and certain qualified
pension and retirement plans. Material irreconcilable conflicts may arise among
various insurance policy owners and plan participants. The Trustees will monitor
events to identify any material conflicts and determine if any action should be
taken to resolve such conflict.

No fee is charged by the Trust on redemption. The variable contracts funded
through the Separate Accounts are sold subject to certain fees and charges which
may include sales and redemption charges. See the prospectuses for the variable
insurance products.

Normally, redemption payments will be made within seven days after the Trust
receives a written redemption request. Redemptions may be suspended when trading
on the New York Stock Exchange is restricted or when permitted by the Securities
and Exchange Commission.


                                                   -----------------------------
                                                   Allmerica Investment Trust
32
<PAGE>

                             Distributions and Taxes

Distributions

Each Fund pays out substantially all of its net investment income and net
capital gains to shareholders each year. Net investment income is paid quarterly
in the case of the Core Equity Fund, Equity Index Fund, Select Growth and Income
Fund, Select Investment Grade Income Fund and Government Bond Fund; annually in
the case of the Select Emerging Markets Fund, Select Aggressive Growth Fund,
Select Capital Appreciation Fund, Select Value Opportunity Fund, Select
International Equity Fund, Select Growth Fund and Select Strategic Growth Fund;
and daily in the case of the Money Market Fund. Distributions of net capital
gains for the year, if any, are made annually. All dividends and capital gain
distributions are applied to purchase additional Fund shares at net asset value
as of the payment date. Fund shares are held by the Separate Accounts and any
distributions are reinvested automatically by the Separate Accounts.

Taxes

The Trust seeks to comply with the provisions of the Internal Revenue Code
applicable to regulated investment companies so that the Trust will not be
subject to federal income tax. Under current tax law, dividend or capital gain
distributions from any Fund are not currently taxable when left to accumulate
within a variable annuity or variable life insurance contract. Withdrawals from
a contract generally are subject to ordinary income tax and, in many cases, to
an additional 10% penalty tax on withdrawals before age 59 1/2. Tax consequences
to investors in the Separate Accounts which are invested in the Trust are
described in more detail in the prospectuses for those accounts.




                                                   -----------------------------
                                                   Allmerica Investment Trust
33
<PAGE>

                         [GRAPHIC] Financial Highlights

                           Allmerica Investment Trust

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                         Income from Investment Operations                             Less Distributions
                   --------------------------------------------- -----------------------------------------------------------------
                                         Net Realized
                      Net                    and                            Distributions
                     Asset       Net      Unrealized             Dividends    from Net
                     Value   Investment  Gain (Loss)  Total from  from Net    Realized    Distributions
    Year Ended     Beginning   Income         on      Investment Investment    Capital         in          Return of     Total
   December 31,     of Year  (Loss)(/2/) Investments  Operations   Income       Gains        Excess         Capital  Distributions
   ------------    --------- ----------- ------------ ---------- ---------- ------------- -------------    --------- -------------
 <S>               <C>       <C>         <C>          <C>        <C>        <C>           <C>              <C>       <C>
 Select Emerging
     Markets
    Fund(/1/)
       1999         $0.784     $0.001       $0.513      $0.514    $(0.006)     $   --        $   --          $  --      $(0.006)
       1998(D)       1.000      0.006       (0.221)     (0.215)    (0.001)         --            --             --       (0.001)
      Select
    Aggressive
   Growth Fund
       1999          2.460     (0.012)       0.963       0.951         --          --            --             --           --
       1998          2.225     (0.008)       0.243       0.235         --          --            --             --           --
       1997          2.037     (0.009)       0.387       0.378         --      (0.182)       (0.008)(/3/)       --       (0.190)
       1996          1.848     (0.009)       0.351       0.342         --      (0.153)           --             --       (0.153)
       1995          1.397     (0.001)       0.452       0.451         --          --            --             --           --
  Select Capital
   Appreciation
    Fund(/1/)
       1999          1.640     (0.007)       0.423       0.416         --      (0.003)           --             --       (0.003)
       1998          1.698     (0.006)       0.241       0.235         --      (0.293)           --             --       (0.293)
       1997          1.485     (0.005)       0.218       0.213         --          --            --             --           --
       1996          1.369     (0.003)       0.124       0.121         --      (0.005)           --             --       (0.005)
       1995(E)       1.000     (0.001)       0.397       0.396         --      (0.027)           --             --       (0.027)
   Select Value
   Opportunity
    Fund(/1/)
       1999          1.686      0.006       (0.077)     (0.071)        --      (0.094)           --             --       (0.094)
       1998          1.626      0.014        0.066       0.080     (0.014)     (0.006)           --             --       (0.020)
       1997          1.511      0.010        0.364       0.374     (0.010)     (0.249)           --             --       (0.259)
       1996          1.238      0.011        0.342       0.353     (0.011)     (0.069)           --             --       (0.080)
       1995          1.089      0.009        0.183       0.192     (0.009)     (0.033)       (0.001)(/3/)       --       (0.043)
      Select
  International
   Equity Fund
       1999          1.542      0.012        0.477       0.489         --          --            --             --           --
       1998          1.341      0.014        0.207       0.221     (0.020)         --            --             --       (0.020)
       1997          1.356      0.015        0.049       0.064     (0.019)     (0.046)       (0.014)(/4/)       --       (0.079)
       1996          1.136      0.011        0.238       0.249     (0.012)     (0.003)       (0.014)(/4/)       --       (0.029)
       1995          0.963      0.013        0.176       0.189     (0.011)     (0.005)           --             --       (0.016)
<CAPTION>
                      Net
                    Increase
                   (Decrease)
                       in
    Year Ended     Net Asset
   December 31,      Value
   ------------    ----------
 <S>               <C>
 Select Emerging
     Markets
    Fund(/1/)
       1999          $0.508
       1998(D)       (0.216)
      Select
    Aggressive
   Growth Fund
       1999           0.951
       1998           0.235
       1997           0.188
       1996           0.189
       1995           0.451
  Select Capital
   Appreciation
    Fund(/1/)
       1999           0.413
       1998          (0.058)
       1997           0.213
       1996           0.116
       1995(E)        0.369
   Select Value
   Opportunity
    Fund(/1/)
       1999          (0.165)
       1998           0.060
       1997           0.115
       1996           0.273
       1995           0.149
      Select
  International
   Equity Fund
       1999           0.489
       1998           0.201
       1997          (0.015)
       1996           0.220
       1995           0.173
</TABLE>
- ------------------
*   Annualized
**  Not Annualized
(A) Including reimbursements, waivers, and reductions.
(B) Excluding reductions. Certain Portfolios have entered into varying arrange-
    ments with brokers who reduced a portion of the Portfolio's expenses.
(C) Excluding reimbursements and reductions.
(D) For period ended December 31, 1998.
(E) For period ended December 31, 1995.
(1) The Select Emerging Markets Fund commenced operations on February 20, 1998.
    The Select Capital Appreciation Fund commenced operations on April 28, 1995
    and changed sub-advisers on April 1, 1998. The Select Value Opportunity
    Fund changed sub-advisers on January 1, 1997.
(2) Net investment income (loss) per share before reimbursement of fees by the
    investment adviser or reductions were $0.000 in 1999, $0.004 in 1998 for
    Select Emerging Markets Fund; $(0.013) in 1999, $(0.009) in 1998 and
    $(0.010) in 1997 for Select Aggressive Growth Fund; $(0.001) in 1995 for
    Select Capital Appreciation Fund; $0.005 in 1999, $0.013 in 1998, $0.009 in
    1997 and $0.010 in 1996 for Select Value Opportunity Fund; and $0.011 in
    1999, $0.014 in 1998, $0.015 in 1997 and $0.011 in 1996 for Select Interna-
    tional Equity Fund.
(3) Distributions in excess of net realized capital gains.
(4) Distributions in excess of net investment income.

                            Ratios/Supplemental Data
        -----------------------------------------------------
                          Ratios To Average Net Assets
               ----------------------------------------

<TABLE>
<CAPTION>
Net Asset             Net Assets
  Value                 End of        Net                                                      Portfolio
 End of    Total        Period    Investment    Operating Expenses        Management Fee       Turnover
 Period    Return      (000's)   Income (Loss)  (A)      (B)      (C)      Gross      Net        Rate
- ---------  ------     ---------- ------------- ------   ------   ------   --------   -------   ---------
<S>        <C>        <C>        <C>           <C>      <C>      <C>      <C>        <C>       <C>
 $ 1.292    65.72%    $   50,452      0.25%      1.88%    1.92%    1.92%     1.35%      1.35%      60%
   0.784   (21.46)%**     20,873      0.96%*     2.19%*   2.19%*   2.54%*    1.35%*     1.00%*     62%**
   3.411    38.66%     1,015,699     (0.46)%     0.88%    0.91%    0.91%     0.85%      0.85%     101%
   2.460    10.56%       752,741     (0.36)%     0.92%    0.95%    0.95%     0.88%      0.88%      99%
   2.225    18.71%       604,123     (0.45)%     0.99%    1.04%    1.04%     0.95%      0.95%      95%
   2.037    18.55%       407,442     (0.53)%     1.08%    1.08%    1.08%     1.00%      1.00%     113%
   1.848    32.28%       254,872     (0.07)%     1.09%      --     1.09%     1.00%      1.00%     104%
   2.053    25.36%       417,087     (0.42)%     0.98%    0.98%    0.98%     0.91%      0.91%      61%
   1.640    13.88%       310,582     (0.47)%     1.02%    1.04%    1.04%     0.94%      0.94%     141%
   1.698    14.28%       240,526     (0.38)%     1.13%    1.13%    1.13%     0.98%      0.98%     133%
   1.485     8.80%       142,680     (0.32)%     1.13%    1.13%    1.13%     1.00%      1.00%      98%
   1.369    39.56%**      41,376     (0.25)%*    1.35%*     --     1.42%*    1.00%*     0.93%*     95%**
   1.521    (4.70)%      308,331      0.43%      0.88%    0.97%    0.97%     0.90%      0.90%      98%
   1.686     4.87%       268,405      0.95%      0.94%    0.98%    0.99%     0.91%      0.90%      73%
   1.626    24.85%       202,139      0.73%      0.98%    1.04%    1.06%     0.92%      0.90%     110%
   1.511    28.53%       113,969      0.91%      0.95%    0.97%    0.97%     0.85%      0.85%      20%
   1.238    17.60%        64,575      0.86%      1.01%      --     1.01%     0.85%      0.85%      17%
   2.031    31.71%       679,341      0.69%      1.01%    1.02%    1.02%     0.89%      0.89%      18%
   1.542    16.48%       505,553      0.99%      1.01%    1.02%    1.02%     0.90%      0.90%      27%
   1.341     4.65%       397,915      1.17%      1.15%    1.17%    1.17%     0.97%      0.97%      20%
   1.356    21.94%       246,877      1.22%      1.20%    1.23%    1.23%     1.00%      1.00%      18%
   1.136    19.63%       104,312      1.68%      1.24%      --     1.24%     1.00%      1.00%      24%
</TABLE>

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                               Income from Investment Operations
                         ---------------------------------------------
                                               Net Realized
                            Net                    and
                           Asset       Net      Unrealized
                           Value   Investment  Gain (Loss)  Total from
                         Beginning   Income         on      Investment
Year Ended December 31,  of Period (Loss)(/2/) Investments  Operations
- -----------------------  --------- ----------- ------------ ----------
<S>                      <C>       <C>         <C>          <C>
Select Growth Fund(/1/)
         1999             $2.428     $(0.002)     $0.709     $ 0.707
         1998              1.811       0.002       0.638       0.640
         1997              1.430       0.006       0.480       0.486
         1996              1.369       0.005       0.297       0.302
         1995              1.099          --       0.270       0.270
   Select Strategic
   Growth Fund(/1/)
         1999              0.973       0.003       0.153       0.156
         1998(D)           1.000       0.002      (0.027)     (0.025)
   Growth Fund(/1/)
         1999              2.825       0.020       0.779       0.799
         1998              2.416       0.028       0.436       0.464
         1997              2.333       0.039       0.540       0.579
         1996              2.176       0.047       0.386       0.433
         1995              1.814       0.049       0.539       0.588
   Equity Index Fund
         1999              3.408       0.036       0.656       0.692
         1998              2.753       0.035       0.741       0.776
         1997              2.165       0.034       0.664       0.698
         1996              1.827       0.035       0.370       0.405
         1995              1.468       0.035       0.474       0.509
   Select Growth and
   Income Fund(/1/)
         1999              1.779       0.022       0.298       0.320
         1998              1.552       0.020       0.233       0.253
         1997              1.405       0.020       0.293       0.313
         1996              1.268       0.020       0.246       0.266
         1995              1.027       0.019       0.290       0.309
<CAPTION>
                                              Less Distributions
                         ------------------------------------------------------------------
                                                                                               Net
                                                                                             Increase
                         Dividends    Distributions                                         (Decrease)
                          from Net      from Net    Distributions    Return                     in
                         Investment     Realized         in            of         Total     Net Asset
Year Ended December 31,    Income     Capital Gains    Excess        Capital  Distributions   Value
- ------------------------ ------------ ------------- ---------------- -------- ------------- ----------
<S>                      <C>          <C>           <C>              <C>      <C>           <C>
Select Growth Fund(/1/)
         1999             $(0.001)       $(0.085)      $    --       $    --     $(0.086)      0.621
         1998                  --(3)      (0.023)           --            --      (0.023)      0.617
         1997              (0.006)        (0.099)           --            --      (0.105)      0.381
         1996              (0.005)        (0.236)           --            --      (0.241)      0.061
         1995                  --             --            --            --          --       0.270
   Select Strategic
   Growth Fund(/1/)
         1999              (0.003)            --            --            --      (0.003)      0.153
         1998(D)           (0.002)            --            --            --      (0.002)     (0.027)
   Growth Fund(/1/)
         1999              (0.020)        (0.294)           --            --      (0.314)      0.485
         1998              (0.028)        (0.027)           --            --      (0.055)      0.409
         1997              (0.038)        (0.458)           --            --      (0.496)      0.083
         1996              (0.048)        (0.228)           --            --      (0.276)      0.157
         1995              (0.049)        (0.177)           --            --      (0.226)      0.362
   Equity Index Fund
         1999              (0.035)        (0.005)           --            --      (0.040)      0.652
         1998              (0.034)        (0.087)           --            --      (0.121)      0.655
         1997              (0.033)        (0.077)           --            --      (0.110)      0.588
         1996              (0.035)        (0.032)           --            --      (0.067)      0.338
         1995              (0.035)        (0.047)       (0.002)(/4/)  (0.066)     (0.150)      0.359
   Select Growth and
   Income Fund(/1/)
         1999              (0.021)        (0.145)           --            --      (0.166)      0.154
         1998              (0.020)        (0.006)           --            --      (0.026)      0.227
         1997              (0.020)        (0.146)           --            --      (0.166)      0.147
         1996              (0.020)        (0.109)           --            --      (0.129)      0.137
         1995              (0.019)        (0.049)           --            --      (0.068)      0.241
</TABLE>
- ------------------------------------
*    Annualized
**   Not Annualized
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.
(D)  For period ended December 31, 1998.
(1)  The Select Growth Fund changed sub-advisers on July 1, 1996. The Select
     Strategic Growth Fund commenced operations on February 20, 1998 and changed
     Sub-Advisers on April 1, 2000. Effective May 1, 2000, the name of the
     Growth Fund was changed to the Core Equity Fund. The Select Growth and
     Income Fund changed sub-advisers on April 1, 1999.
(2)  Net investment income (loss) per share before reimbursement of fees by the
     investment adviser or reductions were $(0.003) in 1999, $0.001 in 1998,
     $0.006 in 1997 and $0.005 in 1996 for Select Growth Fund; $0.003 in 1999,
     $(0.001) in 1998 for Select Strategic Growth Fund; $0.019 in 1999, $0.027
     in 1998, $0.038 in 1997 and $0.046 in 1996 for Growth Fund and $0.022 in
     1999, $0.019 in 1998, $0.019 in 1997 and $0.019 in 1996 for the Select
     Growth and Income Fund.
(3)  Dividends from net investment income are less than $0.0005.
(4)  Distributions in excess of net realized capital gains.

<TABLE>
<CAPTION>
                            Ratios/Supplemental Data
           ---------------------------------------------------------------------
                              Ratios To Average Net Assets
                      ---------------------------------------------------
                      Net Assets
Net Asset               End of        Net        Operating          Management     Portfolio
Value End   Total       Period    Investment      Expenses             Fee         Turnover
of Period  Returns     (000's)   Income (Loss) (A)    (B)    (C)    Gross   Net      Rate
- ---------  -------    ---------- ------------- ----   ----   ----   -----   ----   ---------
<S>        <C>        <C>        <C>           <C>    <C>    <C>    <C>     <C>    <C>
 $3.049     29.80%    $1,216,365    (0.08)%    0.81%  0.83%  0.83%  0.78%   0.78%      84%
  2.428     35.44%       815,390      0.08%    0.85%  0.87%  0.87%  0.82%   0.82%      86%
  1.811     34.06%       470,356      0.42%    0.91%  0.93%  0.93%  0.85%   0.85%      75%
  1.430     22.02%       228,551      0.38%    0.92%  0.93%  0.93%  0.85%   0.85%     159%
  1.369     24.59%       143,125      0.02%    0.97%    --   0.97%  0.85%   0.85%      51%
  1.126     16.06%        31,254      0.41%    1.17%  1.20%  1.20%  0.85%   0.85%      58%
  0.973     (2.47)%**     14,839      0.41%*   1.14%* 1.20%* 1.66%* 0.85%*  0.39%*     24%**
  3.310     29.33%     1,076,297      0.65%    0.45%  0.48%  0.48%  0.43%   0.43%     116%
  2.825     19.32%       860,333      1.08%    0.46%  0.49%  0.49%  0.44%   0.44%     100%
  2.416     25.14%       728,679      1.48%    0.47%  0.49%  0.49%  0.43%   0.43%      79%
  2.333     20.19%       556,751      2.04%    0.48%  0.51%  0.51%  0.44%   0.44%      72%
  2.176     32.80%       444,871      2.34%    0.54%    --   0.54%  0.46%   0.46%      64%
  4.060     20.41%       638,230      0.98%    0.35%  0.35%  0.35%  0.28%   0.28%      21%
  3.408     28.33%       481,877      1.17%    0.36%  0.36%  0.36%  0.29%   0.29%       6%
  2.753     32.41%       297,191      1.38%    0.44%  0.44%  0.44%  0.31%   0.31%       9%
  2.165     22.30%       151,130      1.79%    0.46%  0.46%  0.46%  0.32%   0.32%      12%
  1.827     36.18%        90,889      1.96%    0.55%    --   0.55%  0.34%   0.34%       8%
  1.933     18.43%       844,538      1.17%    0.73%  0.74%  0.74%  0.67%   0.67%     131%
  1.779     16.43%       646,086      1.26%    0.70%  0.73%  0.73%  0.68%   0.68%     112%
  1.552     22.51%       473,552      1.34%    0.77%  0.80%  0.80%  0.73%   0.73%      71%
  1.405     21.26%       295,638      1.44%    0.80%  0.83%  0.83%  0.75%   0.75%      78%
  1.268     30.32%       191,610      1.69%    0.85%    --   0.85%  0.75%   0.75%     112%
</TABLE>

     FINANCIAL HIGHLIGHTS - For a Share Outstanding Throughout Each Period
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                              Income from Investment Operations                             Less Distributions
                  --------------------------------------------------------- ------------------------------------------------------
                                         Net Realized
                     Net                     and                            Distributions
                    Asset       Net       Unrealized             Dividends    from Net
                    Value    Investment  Gain (Loss)  Total from  from Net    Realized    Distributions
   Year Ended     Beginning    Income         on      Investment Investment    Capital         in          Return of     Total
  December 31,     of Year     (Loss)    Investments  Operations   Income       Gains        Excess         Capital  Distributions
  ------------    --------- ------------ ------------ ---------- ---------- ------------- -------------    --------- -------------
<S>               <C>       <C>          <C>          <C>        <C>        <C>           <C>              <C>       <C>
Investment Grade
Income Fund(1)
      1999          1.132      0.068        (0.079)     (0.011)    (0.069)      (0.001)          --            --       (0.070)
      1998          1.112      0.067         0.020       0.087     (0.067)          --           --            --       (0.067)
      1997          1.084      0.071         0.028       0.099     (0.071)          --           --            --       (0.071)
      1996          1.117      0.070        (0.033)      0.037     (0.070)          --           --            --       (0.070)
      1995          1.012      0.071         0.106       0.177     (0.071)          --       (0.001)(2)        --       (0.072)
   Government
   Bond Fund
      1999          1.068      0.058        (0.056)      0.002     (0.059)          --           --            --       (0.059)
      1998          1.047      0.058         0.021       0.079     (0.058)          --           --            --       (0.058)
      1997          1.036      0.061         0.011       0.072     (0.061)          --           --            --       (0.061)
      1996          1.062      0.062        (0.026)      0.036     (0.062)          --           --            --       (0.062)
      1995          0.997      0.062         0.066       0.128     (0.062)          --       (0.001)(2)        --       (0.063)
  Money Market
      Fund
      1999          1.000      0.051            --       0.051     (0.051)          --           --            --       (0.051)
      1998          1.000      0.054            --       0.054     (0.054)          --           --            --       (0.054)
      1997          1.000      0.053            --       0.053     (0.053)          --           --            --       (0.053)
      1996          1.000      0.052            --       0.052     (0.052)          --           --            --       (0.052)
      1995          1.000      0.057            --       0.057     (0.057)          --           --            --       (0.057)
<CAPTION>
                     Net
                   Increase
                  (Decrease)
                      in
   Year Ended     Net Asset
  December 31,      Value
  ------------    ----------
<S>               <C>
Investment Grade
Income Fund(1)
      1999          (0.081)
      1998           0.020
      1997           0.028
      1996          (0.033)
      1995           0.105
   Government
   Bond Fund
      1999          (0.057)
      1998           0.021
      1997           0.011
      1996          (0.026)
      1995           0.065
  Money Market
      Fund
      1999              --
      1998              --
      1997              --
      1996              --
      1995              --
</TABLE>
- ------------------------------------
(A)  Including reimbursements and reductions.
(B)  Excluding reductions. Certain Portfolios have entered into varying
     arrangements with brokers who reduced a portion of the Portfolio's
     expenses.
(C)  Excluding reimbursements and reductions.
(1)  Effective May 1, 2000, the name of the Investment Grade Income Fund was
     changed to the Select Investment Grade Income Fund.
(2)  Distributions in excess of net investment income.

<TABLE>
<CAPTION>
                           Ratios/Supplemental Data
           ---------------------------------------------------------------
                            Ratios To Average Net Assets
                    ------------------------------------------------
                    Net Assets
Net Asset             End of        Net        Operating       Management   Portfolio
Value End  Total       Year     Investment      Expenses          Fee       Turnover
 of Year   Return    (000's)   Income (Loss) (A)   (B)   (C)   Gross  Net     Rate
- ---------  ------   ---------- ------------- ----  ----  ----  -----  ----  ---------
<S>        <C>      <C>        <C>           <C>   <C>   <C>   <C>    <C>   <C>
 $0.953    (0.85)%   $174,037      6.26%     0.61% 0.61% 0.61% 0.52%  0.52%    177%
  1.032     6.83%     160,450      5.92%     0.64% 0.64% 0.64% 0.54%  0.54%    130%
  1.022     9.17%     104,253      6.12%     0.72% 0.72% 0.72% 0.59%  0.59%     79%
  0.995     3.32%      77,498      6.29%     0.74% 0.74% 0.74% 0.60%  0.60%    108%
  1.024    16.96%      60,368      6.24%     0.79%   --  0.80% 0.60%  0.59%    131%
  1.051    (0.97)%    240,541      6.22%     0.50% 0.50% 0.50% 0.43%  0.43%     75%
  1.132     7.97%     230,623      6.01%     0.52% 0.52% 0.52% 0.43%  0.43%    158%
  1.112     9.45%     189,503      6.48%     0.51% 0.51% 0.51% 0.41%  0.41%     48%
  1.084     3.56%     157,327      6.50%     0.52% 0.52% 0.52% 0.40%  0.40%    108%
  1.117    17.84%     141,625      6.66%     0.53%   --  0.53% 0.41%  0.41%    126%
  1.011     0.23%      87,247      5.64%     0.62% 0.62% 0.62% 0.50%  0.50%     37%
  1.068     7.67%      81,018      5.63%     0.64% 0.64% 0.64% 0.50%  0.50%     61%
  1.047     7.08%      55,513      5.92%     0.67% 0.67% 0.67% 0.50%  0.50%     56%
  1.036     3.51%      46,396      5.90%     0.66% 0.66% 0.66% 0.50%  0.50%    112%
  1.062    13.06%      45,778      5.91%     0.69%   --  0.69% 0.50%  0.50%    180%
  1.000     5.19%     513,606      5.09%     0.29% 0.29% 0.29% 0.24%  0.24%    N/A
  1.000     5.51%     336,253      5.36%     0.32% 0.32% 0.32% 0.26%  0.26%    N/A
  1.000     5.47%     260,620      5.33%     0.35% 0.35% 0.35% 0.27%  0.27%    N/A
  1.000     5.36%     217,256      5.22%     0.34% 0.34% 0.34% 0.28%  0.28%    N/A
  1.000     5.84%     155,211      5.68%     0.36%   --  0.36% 0.29%  0.29%    N/A
</TABLE>

The financial highlights tables are intended to help you understand each Fund's
financial performance for the past five years (or, if shorter, the period of the
Fund's operations). Certain information reflects financial results for a single
Fund share. The total returns in the tables represent the rate that an investor
would have earned or lost on an investment in a Fund (assuming reinvestment of
all dividends and distributions). This information has been audited by
PricewaterhouseCoopers LLP, whose report, along with each Fund's financial
statements, are included in the Statement of Additional Information or annual
report, which is available upon request.


- -----------------------------
Allmerica Investment Trust
                                                                              34

<PAGE>

                                    Appendix

Investment Techniques and Strategies


In managing its portfolios of investments, the Trust may make use of the
following investment techniques and strategies:

       Symbols

      o    Permitted

     --    Not Permitted
<TABLE>
<CAPTION>
                                    Select         Select        Select        Select         Select                      Select
                                   Emerging      Aggressive      Capital        Value      International     Select      Strategic
                                    Markets        Growth     Appreciation   Opportunity      Equity         Growth       Growth
Investment Technique/Strategy        Fund           Fund          Fund          Fund           Fund           Fund         Fund
- -----------------------------        ----           ----          ----          ----           ----           ----         ----
<S>                                <C>           <C>          <C>            <C>           <C>            <C>            <C>
Asset-Backed Securities               --             --             --             --             --             --             --
Financial Futures Contracts
      and Related Options             o              o              o              o              o              o              o
Foreign Securities                    o              o              o              o              o              o              o
Forward Commitments                   --             --             o              --             --             --             --
Forward Contracts on Foreign
      Currencies                      o              --             o              --             o              o              --
High Yield Securities                 o              --             o              --             --             o              --
Investments in Money Market
      Securities                      o              o              o              o              o              o              o
Mortgage-Backed Securities            --             --             --             --             --             --             --
Purchasing Options                    o              o              o              o              o              o              o
Repurchase Agreements                 o              o              o              o              o              o              o
Restricted Securities                 o              o              o              o              o              o              o
Reverse Repurchase Agreements         --             --             o              --             --             --             --
Securities Lending                    o              o              o              --             o              o              o
Stand-By Commitments                  --             --             --             --             --             --             --
Stripped Mortgage-Backed
      Securities                      --             --             --             --             --             --             --
Swap and Swap-Related Products        --             --             o              --             --             --             --
When-Issued Securities                o              o              o              o              o              o              o
Writing Covered Options               o              o              o              o              o              o              o
- -----------------------               -              -              -              -              -              -
</TABLE>
<TABLE>
<CAPTION>
                                                               Select                       Select
                                                               Growth                     Investment
                                    Core          Equity        and                          Grade          Government     Money
                                   Equity         Index        Income                       Income             Bond        Market
Investment Technique/Strategy       Fund          Fund          Fund                         Fund              Fund         Fund
- -----------------------------       ----          ----          ----                         ----              ----         ----
<S>                                <C>           <C>          <C>                         <C>               <C>           <C>
Asset-Backed Securities               o              --             o                             o              o              o
Financial Futures Contracts
      and Related Options             o              o              o                             o              o              --
Foreign Securities                    o              o              o                             o              --             o
Forward Commitments                   --             --             --                            o              o              o
Forward Contracts on Foreign
     Currencies                       --             --             --                            --             --             --
High Yield Securities                 --             --             --                            --             --             --
Investments in Money Market
     Securities                       o              o              o                             o              o              o
Mortgage-Backed Securities            --             --             --                            o              o              --
Purchasing Options                    o              o              o                             o              o              --
Repurchase Agreements                 o              o              o                             o              o              o
Restricted Securities                 o              o              o                             o              o              o
Reverse Repurchase Agreements         --             --             --                            --             --             --
Securities Lending                    o              o              o                             o              o              o
Stand-By Commitments                  --             --             --                            o              o              o
Stripped Mortgage-Backed
     Securities                       --             --             --                            o              o              --
Swap and Swap-Related Products        --             --             --                            --             --             --
When-Issued Securities                o              o              o                             o              o              o
Writing Covered Options               o              o              o                             o              o              --
- -----------------------               -              -              -                             -              -              --
</TABLE>

                                      42

                          Allmerica Investment Trust
<PAGE>

                           Allmerica Investment Trust

                          Select Emerging Markets Fund

                          Select Aggressive Growth Fund

                        Select Capital Appreciation Fund

                          Select Value Opportunity Fund

                        Select International Equity Fund

                               Select Growth Fund

                          Select Strategic Growth Fund

                                Core Equity Fund

                                Equity Index Fund

                          Select Growth and Income Fund



                       Select Investment Grade Income Fund

                              Government Bond Fund

                                Money Market Fund

The Trust's Statement of Additional Information ("SAI") includes additional
information about the Funds. The Trust's annual and semi-annual reports to
shareholders include information about the investments of the Funds. The SAI and
the financial statements included in the Fund's most recent annual report to
shareholders are incorporated by reference into this prospectus, which means
they are part of this prospectus for legal purposes. The Trust's annual report
discusses the market conditions and investment strategies that significantly
affected each Fund's performance during its last fiscal year. You may get free
copies of these materials, request other information about a Fund or make
shareholder inquiries by calling 1-800-828-0540.

You may review and copy information about the Trust, including its SAI, at the
Securities and Exchange Commission's Public Reference Room in Washington, D.C.
You may call the Commission at 1-800-SEC-0330 for information about the
operation of the Public Reference Room. You may also access reports and other
information about the Trust on the Commission's Internet site at
http://www.sec.gov. You may get copies of this information, with payment of a
duplication fee, by writing the Public Reference Section of the Commission,
Washington, D.C. 20549-6009. You may need to refer to the Trust's file number
under the Investment Company Act, which is 811-4138.

                                   ALLMERICA
                                  INVESTMENT
                                     TRUST

               440 Lincoln Street, Worcester, Massachusetts 01653
                                 1-800-828-0540
<PAGE>

                          ALLMERICA INVESTMENT TRUST
                      STATEMENT OF ADDITIONAL INFORMATION

                         SELECT EMERGING MARKETS FUND
                         SELECT AGGRESSIVE GROWTH FUND
                       SELECT CAPITAL APPRECIATION FUND
                         SELECT VALUE OPPORTUNITY FUND
                       SELECT INTERNATIONAL EQUITY FUND
                              SELECT GROWTH FUND
                         SELECT STRATEGIC GROWTH FUND

                               CORE EQUITY FUND
                               EQUITY INDEX FUND
                         SELECT GROWTH AND INCOME FUND
                              SELECT INCOME FUND

                      SELECT INVESTMENT GRADE INCOME FUND
                             GOVERNMENT BOND FUND
                               MONEY MARKET FUND

THIS STATEMENT OF ADDITIONAL INFORMATION ("SAI") IS NOT A PROSPECTUS. IT SHOULD
BE READ IN CONJUNCTION WITH THE APPLICABLE PROSPECTUS OF ALLMERICA INVESTMENT
TRUST DATED MAY 1, 2000. A FREE COPY OF THE APPLICABLE PROSPECTUS MAY BE
OBTAINED FROM ALLMERICA INVESTMENT TRUST (THE "TRUST"), 440 LINCOLN STREET,
WORCESTER, MASSACHUSETTS 01653, (508) 855-1000.

The Trust's Financial Statements and related notes and the report of the
independent accountants for the fiscal year ended December 31, 1999 are
incorporated by reference into this SAI and are included in the Trust's Annual
Report to Shareholders. The Annual Report to Shareholders is available, without
charge, upon request, by calling the following toll free number: 1-800-828-0540.


                               DATED: MAY 1, 2000
<PAGE>

                                TABLE OF CONTENTS

TRUST HISTORY...........................................................    3

DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS................    3
    INVESTMENT RESTRICTIONS AND POLICIES................................   10
    INVESTMENT STRATEGIES AND TECHNIQUES................................   11
    PORTFOLIO TURNOVER..................................................   25

MANAGEMENT OF THE TRUST.................................................   25

CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES.....................   28

INVESTMENT MANAGEMENT AND OTHER SERVICES................................   28

BROKERAGE ALLOCATION AND OTHER PRACTICES................................   39

CAPITAL STOCK AND OTHER SECURITIES......................................   41

PURCHASE, REDEMPTION AND PRICING OF SHARES..............................   42

TAXATION OF THE FUNDS OF THE TRUST......................................   43

UNDERWRITERS............................................................   43

CALCULATION OF PERFORMANCE DATA.........................................   44

FINANCIAL STATEMENTS....................................................   47


- ------------------------------
Allmerica Investment Trust

                                       2
<PAGE>

                                  TRUST HISTORY

The Trust is an open-end, diversified series investment company designed to
provide the underlying investment vehicle for various separate investment
accounts established by First Allmerica Financial Life Insurance Company ("First
Allmerica") or Allmerica Financial Life Insurance and Annuity Company
("Allmerica Financial Life"), wholly-owned subsidiary of First Allmerica. Shares
of the Trust are not offered to the general public but solely to such separate
investment accounts ("Separate Accounts"). Not all of the Funds are offered to
each Separate Account.

The Trust is a Massachusetts business trust established on October 11, 1984. It
currently is comprised of fourteen different portfolios: Select Emerging Markets
Fund, Select Aggressive Growth Fund, Select Capital Appreciation Fund, Select
Value Opportunity Fund, Select International Equity Fund, Select Growth Fund,
Select Strategic Growth Fund, Core Equity Fund (formerly the Growth Fund),
Equity Index Fund, Select Growth and Income Fund, Select Income Fund, Select
Investment Grade Income Fund (formerly the Investment Grade Income Fund),
Government Bond Fund and Money Market Fund (each, a "Fund"). The Trustees may
create additional funds in the future. On or about July 1, 2000, subject to
regulatory approval, shares of the Select Investment Grade Income Fund will be
substituted for shares of the Select Income Fund. As of the substitution date,
shares of the Select Income Fund will no longer be offered.


                            DESCRIPTION OF THE FUNDS
                         AND THEIR INVESTMENTS AND RISKS

ADDITIONAL INFORMATION ABOUT THE FUNDS

For a description of the Funds' principal investment strategies and risks, types
of investments each Fund may acquire and certain investment techniques it may
utilize, see "Principal Investment Strategies and Risks" and "Other Investment
Strategies and Risks" in the appropriate Prospectus for the underlying Funds of
the applicable Separate Account. Following are descriptions of additional Fund
strategies, policies and restrictions. Note that any percentage limitations
listed under each Fund below apply at the time of investment.

SELECT EMERGING MARKETS FUND

The Fund invests at least 65% of its total assets in equity securities of
companies that are domiciled or primarily doing business in developing countries
with emerging markets. A company is considered to be domiciled in a developing
country if it is organized under the laws of, or has a principal office in, that
country. A company is considered as primarily doing business in a developing
country if (i) the company derives at least 50% of its gross revenues or profits
from either goods or services produced or sold in the developing country or (ii)
at least 50% of the company's assets are situated in the developing country.


The Sub-Adviser may employ a temporary defensive strategy if deemed by it to be
appropriate due to economic or political conditions in emerging markets. When
using a defensive strategy, the Fund may invest up to 100% of its assets in
cash, high-quality debt securities or money market instruments of U.S. or
foreign issuers. In addition, most or all of its investment may be made in the
United States and in U.S. dollars for temporary defensive purposes.

The Fund may invest up to 15% of its net assets in securities which are
illiquid.

Investing in the Fund entails a substantial degree of risk. Investors are
strongly advised to consider carefully the special risks involved in investing
in emerging markets, which are in addition to the usual risks of investing in
developed countries around the world.

SELECT AGGRESSIVE GROWTH FUND

The selection of securities is made solely on the basis of their potential for
capital appreciation. Dividend and interest income from portfolio securities, if
any, is incidental to the Fund's investment objective.

At any given point, a substantial portion of the Fund's equity investments may
be in securities which are not listed for trading on national securities
exchanges and which, although publicly traded, may be less liquid than
securities issued


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       3
<PAGE>

by larger, more seasoned companies which trade on national securities exchanges.
Up to 15% of the Fund's net assets may be invested in securities which are
illiquid.

Because the price movement of the securities held by the Fund can be expected to
be more volatile than is the case for the market as a whole, and the net asset
value of a share of the Fund may fluctuate significantly, the Fund should not be
considered suitable for investors who are unable or unwilling to assume the risk
of loss inherent in an aggressive growth portfolio, nor should investment in the
Fund be considered a balanced or complete investment program.

When the Sub-Adviser of the Fund determines that market conditions warrant a
temporary defensive position, the Fund may invest without limitation in high-
grade, fixed income securities or U.S. Government securities, or hold assets in
cash or cash equivalents.

SELECT CAPITAL APPRECIATION FUND

Up to 15% of the Fund's net assets may be invested in securities which are
illiquid. When the Sub-Adviser of the Fund determines that market conditions
warrant a temporary defensive position, the Fund may invest without limitation
in high-grade, fixed income securities or U.S. Government securities, or hold
assets in cash or cash equivalents.

SELECT VALUE OPPORTUNITY FUND

The Fund may invest temporarily in preferred stocks, bonds and other defensive
issues. There are no restrictions or guidelines regarding the investment of Fund
assets in shares listed on an exchange or traded over-the- counter. The Fund may
invest up to 15% of its net assets in securities which are illiquid.

The portfolio normally will be diversified among different industry sectors, but
is not an index approach. Stocks are bought as investments and generally held
for the long term, rather than as active trading vehicles.

SELECT INTERNATIONAL EQUITY FUND

The Fund may invest up to 15% of its net assets in securities which are
illiquid. When the Sub-Adviser of the Fund determines that market conditions
warrant a temporary defensive position, the Fund may invest without limitation
in high-grade, fixed income securities or U.S. Government securities, or hold
assets in cash or cash equivalents.

SELECT GROWTH FUND

Although the Fund may invest in dividend-paying stocks, the generation of
current income is not an objective of the Fund. Any income that is received is
incidental to the Fund's objective of long-term growth of capital.

When choosing securities for the portfolio, the Sub-Adviser for the Select
Growth Fund focuses on companies that display strong financial characteristics
and earnings growth potential.

The stocks of smaller growth companies may involve a higher degree of risk than
other types of securities and the price movement of such securities can be
expected to be more volatile than is the case of the market on the whole. The
Fund may hold stocks traded on one or more of the national exchanges as well as
in the over-the-counter markets. Because opportunities for capital growth may
exist not only in new and expanding areas of the economy but also in mature and
cyclical industries, the Fund's portfolio investments are not limited to any
particular type of company or industry.

When the Sub-Adviser determines that market conditions warrant a temporary,
defensive position, the Fund may invest without limitation in high-grade, fixed-
income securities or U.S. Government securities, or hold assets in cash or cash
equivalents. To the extent the Fund is so invested it is not achieving its
objective to the same degree as under normal conditions.


- ------------------------------
Allmerica Investment Trust

                                       4
<PAGE>

The Select Growth Fund's objective of seeking long-term growth of capital means
that its assets generally will be subject to greater risk than may be involved
in investing in securities that are not selected for growth potential. The Fund
may invest up to 15% of its net assets in securities which are illiquid.

SELECT STRATEGIC GROWTH FUND




The Fund may invest up to 15% of its net assets in securities which are
illiquid.


CORE EQUITY FUND (formerly the Growth Fund)

The Core Equity Fund proposes to keep its assets fully invested, but may
maintain reasonable amounts in cash or in high-grade, short-term debt securities
to meet current expenses and anticipated redemptions, and during temporary
periods pending investment in accordance with its policies.

In periods considered by management to warrant a more defensive position, the
Core Equity Fund may place a larger proportion of its portfolio in high-grade
preferred stocks, bonds or other fixed-income securities, including U.S.
Government securities, whether or not convertible into stock or with rights
attached, or retain cash.

The Core Equity Fund may invest in both listed and unlisted securities. The
Core Equity Fund also may invest in foreign as well as domestic securities.

The Fund may invest up to 15% of its net assets in securities which are
illiquid.

EQUITY INDEX FUND

The Equity Index Fund will attempt to replicate the investment results of the
Standard & Poor's 500 Composite Stock Price Index (the "S&P 500") while
minimizing transactional costs and other expenses. Stocks in the S&P 500 are
ranked in accordance with their statistical weighting from highest to lowest.
The method used to select investments for the Equity Index Fund involves
investing in common stocks in approximately the order of their weighting in the
S&P 500, beginning with those having the highest weighting. The Fund uses the
S&P 500 as the performance standard because it represents over 70 percent of the
total market value of all publicly-traded common stocks in the U.S., is well-
known to investors and, in the opinion of the Sub-Adviser, is representative of
the performance of common stocks publicly-traded in the United States. Many, but
not all, of the stocks in the S&P 500 are issued by companies that are among the
500 largest as measured by the aggregate market value of their outstanding stock
(market price per share multiplied by number of shares outstanding). Inclusion
of a stock in the S&P 500 does not imply that Standard & Poor's Ratings Service,
a division of McGraw-Hill Companies, Inc. ("S&P") has endorsed it as an
investment. With respect to investing in common stocks, there can be no
assurance of capital appreciation and there is a substantial risk of market
decline.

The Equity Index Fund's ability to duplicate the performance of the S&P 500 will
be influenced by the size and timing of cash flows into or out of the Fund, the
liquidity of the securities included in the S&P 500, transaction and operating
expenses and other factors. These factors, among others, may result in "tracking
error," which is a measure of the degree to which the Fund's results differ from
the results of the S&P 500.


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Tracking error is measured by the difference between total return for the S&P
500 with dividends reinvested and total return for the Fund with dividends
reinvested after deductions of transaction and operating expenses. For the 12
months ended December 31, 1999, the S&P 500 gained 21.03% versus a gain of
20.41% for the Equity Index Fund producing a tracking error of 0.62% before
advisory and administrative fees. Tracking error is monitored by the Sub-Adviser
on a regular basis. All tracking error deviations are reviewed to determine the
effectiveness of investment policies and techniques. If the tracking error
deviation exceeds industry standards for the Fund's asset size, the Sub-Adviser
will bring the deviation to the attention of the Trustees.

While the Board of Trustees of the Trust has selected the S&P 500 as the index
the Fund will attempt to replicate, the Trustees reserve the right to select
another index at any time without seeking shareholder approval if they believe
that the S&P 500 no longer represents a broad spectrum of common stocks that are
publicly traded in the United States or if there are legal, economic or other
factors limiting the use of any particular index. If the Trustees change the
index which the Equity Index Fund attempts to replicate, the Equity Index Fund
may incur significant transaction costs in switching from one index to another.

The Equity Index Fund will invest only in those stocks, and in such amounts, as
its investment adviser determines to be necessary or appropriate for the Equity
Index Fund to approximate the S&P 500. As the size of the Equity Index Fund
increases, the Equity Index Fund may purchase a larger number of stocks included
in the S&P 500, and the percentage of its assets invested in most stocks
included in the S&P 500 will approach the percentage that each such stock
represents in the S&P 500. However, there is no minimum or maximum number of
stocks included in the S&P 500 which the Equity Index Fund will hold. Under
normal circumstances, it is expected that the Equity Index Fund will hold
approximately 500 different stocks included in the S&P 500. The Equity Index
Fund may compensate for the omission of a stock that is included in the S&P 500,
or for purchasing stocks in other than the same proportions that they are
represented in the S&P 500, by purchasing stocks which are believed to have
characteristics which correspond to those of the omitted stocks.

The Equity Index Fund may invest in short-term debt securities to maintain
liquidity or pending investment in stocks. Such investments will not be made for
defensive purposes or in anticipation of a general decline in the market price
of stocks in which the Equity Index Fund invests; investors in the Equity Index
Fund bear the risk of general declines in the stock markets. The Equity Index
Fund also may take advantage of tender offers, resulting in higher returns than
are reflected in the performance of the S&P 500. In addition, the Equity Index
Fund may hold warrants, preferred stocks and debt securities, whether or not
convertible into common stock or with rights attached, if acquired as a result
of in-kind dividend distributions, mergers, acquisitions or other corporate
activity involving the common stocks held by the Equity Index Fund. Such
investment transactions and securities holdings may result in positive or
negative tracking error.

The Equity Index Fund may purchase or sell futures contracts on stocks indexes
for hedging purposes and in order to achieve a fully invested position while
maintaining sufficient liquidity to meet possible net redemptions. The
effectiveness of a strategy of investing in stock index futures contracts will
depend upon the continued availability of futures contracts based on the S&P 500
or which tend to move together with stocks included in the S&P 500. The Equity
Index Fund would not enter into futures contacts on stock indexes for
speculative purposes.

The Equity Index Fund may invest up to 25% of its assets in foreign securities
(not including its investments in American Depositary Receipts ("ADRs")). The
Equity Index Fund may invest up to 15% of its net assets in securities which are
illiquid.

Because of its policy of tracking the S&P 500, the Equity Index Fund is not
managed according to traditional methods of active investment management, which
involve the buying and selling of securities based upon investment analysis of
economic, financial and market factors. Consequently, the projected adverse
financial performance of a company normally would not result in the sale of the
company's stock and projected superior financial performance by a company
normally would not lead to an increase in the holdings of the company. From time
to time, the Sub-Adviser may make adjustments in the portfolio because of cash
flows, mergers, changes in the composition of the S&P 500 and other similar
reasons.


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Standard & Poor's Corporation is not in any way affiliated with the Equity Index
Fund or the Trust. "Standard & Poor's," "Standard & Poor's 500," and "500" are
trademarks of Standard & Poor's Corporation.

SELECT GROWTH AND INCOME FUND

To achieve its objective of long-term growth of capital and current income, the
Select Growth and Income Fund will invest primarily in dividend-paying common
stocks and securities convertible into common stocks. These may include
securities of large well-known companies as well as smaller growth companies.
The Fund may hold securities traded on one or more of the national exchanges as
well as in the over-the-counter markets. The Fund may purchase individual stocks
not presently paying dividends which offer opportunities for capital growth or
future income, provided that the Sub-Adviser believes the overall portfolio is
appropriately positioned to achieve its income objective. In certain
circumstances, fixed-income securities may be purchased by the Fund for long-
term growth potential.

The Fund may invest up to 15% of its net assets in securities which are
illiquid.

When the Sub-Adviser determines that market conditions warrant a temporary,
defensive position, the Fund may invest without limitation in high-grade, fixed-
income or U.S. Government securities, or hold assets in cash or cash
equivalents. To the extent the Fund is so invested, it is not achieving its
objective to the same degree as under normal conditions. There can be no
assurance of growth of capital, of course, and because the Fund invests a
substantial portion of its assets in common stocks and other securities which
fluctuate in value, there is substantial risk of market decline.

SELECT INCOME FUND

Investment grade corporate debt securities in which the Fund invests are: (a)
assigned a rating within the four highest grades (Baa/BBB or higher) by either
Moody's Investor Service, Inc. ("Moody's") or S&P, (b) equivalently rated by
another nationally recognized statistical rating organization ("NRSRO") or (c)
unrated securities but determined by the Sub-Adviser to be of comparable
quality. Securities rated in the fourth highest grade (rated Baa and BBB by
Moody's and S&P, respectively) are considered to have some speculative
characteristics. For more information concerning the rating categories of
corporate debt securities and commercial paper, see the Appendix to the SAI. The
types of securities in which the Fund invests include but are not limited to
U.S. dollar obligations of supranational entities such as the World Bank,
European Investment Bank and African Development Bank. The Fund may also invest
in interest-only and principal-only Treasury securities and in municipal bonds
when such bonds are deemed by the Sub-Adviser to be attractive investments for
the portfolio. The Fund serves as an investment vehicle for variable annuity
contracts and variable life insurance policies. Investments by the Fund in
municipal bonds offer no tax benefits in addition to those already offered to
variable annuity contract owners and variable life insurance policyholders.

The dollar average weighted maturity of the portfolio, excluding money market
instruments, is expected to range between 5 and 20 years under normal market
conditions. Although the Fund does not invest for short-term trading purposes,
portfolio securities may be sold from time to time without regard to the length
of time they have been held. The value of the Fund's portfolio securities
generally will vary inversely with changes in prevailing interest rates,
declining as interest rates rise and increasing as rates decline. The value will
also be affected by other market and economic factors. There is the risk with
corporate debt securities that the issuers may not be able to meet their
obligations on interest and principal payments.

The Fund may invest up to 15% of its net assets in securities which are
illiquid.

Obligations in which the Select Income Fund may invest include debt obligations
of supranational entities. Supranational entities include international
organizations designated or supported by governmental entities to promote
economic reconstruction or development and international banking institutions
and related government agencies. Obligations of supranational entities may be
supported by appropriated but unpaid commitments of their member countries, and
there is no assurance that these commitments will be undertaken or met in the
future.

SELECT INVESTMENT GRADE INCOME FUND (formerly the Investment Grade Income Fund)

The debt securities in which the Fund may invest are considered "investment
grade" in that they generally are suitable for purchase by prudent investors.
However, the lowest category of investment grade securities (rated Baa by
Moody's or BBB by S&P) may have speculative characteristics, such that changes
in economic conditions or other circumstances are more likely to lead to a
weakened capacity to make principal and interest payments than is the case of
debt securities with higher ratings. If the rating of a security falls below
investment grade, or an unrated security is deemed to have fallen below
investment grade, AAM analyzes relevant economic and market data in making a
determination of whether to retain or dispose of the investment. The performance
of the securities in the portfolio is monitored continuously, and they are
purchased and sold as conditions warrant and permit.


                                                  ------------------------------
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                                       7
<PAGE>

The Fund may invest up to 15% of its net assets in securities which are
illiquid.

Obligations in which the Fund may invest include debt obligations of
supranational entities. Supranational entities include international
organizations designed or supported by governmental entities to promote economic
reconstruction or development and international banking institutions and related
government agencies. Obligations of supranational entities may be supported by
appropriated but unpaid commitments of their member countries, and there is no
assurance that these commitments will be undertaken or met in the future.

GOVERNMENT BOND FUND

The Government Bond Fund will invest in obligations issued or guaranteed by the
U.S. Government, its agencies and instrumentalities, and options and futures
thereon, as described in the Prospectus. Some U.S. Government securities are
backed by the full faith and credit of the United States. Other U.S. Government
securities are supported by (i) the right of the issuer to borrow from the U.S.
Treasury, (ii) discretionary authority of the U.S. Government to purchase the
obligations of the agency or instrumentality, or (iii) only the credit of the
instrumentality itself. No assurances can be given that the U.S. Government
would provide financial support to the U.S. Government sponsored
instrumentalities if it is not obligated to do so by law. The securities in
which the Government Bond Fund may invest include, but are not limited to, U.S.
Treasury bills, notes and bonds and obligations of the following: Banks for
Cooperatives, the Commodity Credit Corporation, the Federal Deposit Insurance
Corporation, Federal Farm Credit Banks, the Federal Financing Bank, Federal
National Mortgage Association, the General Insurance Fund, Government National
Mortgage Association, Government Services Administration (GSA Public Building
Trust Participation Certificates), the Production Credit Association, the
Student Loan Marketing Association, the Tennessee Valley Authority and the U.S.
Postal Service.

The Government Bond Fund may invest in mortgage-backed securities (including
pass-through securities) and participation certificates) of the Government
National Mortgage Association ("Ginnie Mae"), the Federal Home Loan Mortgage
Corporation ("Freddie Mac") and the Federal National Mortgage Association
("Fannie Mae").

Ginnie Mae certificates are mortgage-backed securities representing part
ownership of a pool of mortgage loans. The mortgage loans are issued by lenders
such as mortgage bankers, commercial banks and savings and loan associations,
and are either insured by the Federal Housing Administration or guaranteed by
the Veterans Administration. After approval of the pool by Ginnie Mae,
certificates in the pool are offered to investors by securities dealers. Once
the pool has been approved by Ginnie Mae, the timely payment of interest and
principal on the certificates is guaranteed by the full faith and credit of the
U.S. Government. The certificates are "pass through" securities because a pro
rata share of regular interest and principal payments, as well as unscheduled
early prepayments, on the underlying mortgage pool is passed through monthly to
the Fund.

Freddie Mac, a corporate instrumentality of the U.S. Government created by
Congress to increase the availability of mortgage credit for residential
housing, issues participation certificates representing undivided interests in
Freddie Mac's mortgage portfolio. While Freddie Mac guarantees the timely
payment of interest and ultimate collection of the principal of its
participation certificates, the participation certificates are not backed by the
full faith and credit of the U.S. Government. The "pass-through" characteristics
of Freddie Mac participation certificates are similar to Ginnie Mae
certificates, but Freddie Mac certificates differ from Ginnie Mae certificates
in that Freddie Mac mortgages are primarily conventional residential mortgages
rather than mortgages issued or guaranteed by a federal agency or
instrumentality.

Fannie Mae is a federally chartered corporation owned by private stockholders.
Fannie Mae purchases both conventional and federally insured or guaranteed
residential mortgages form various entities, and packages pools of such
mortgages in the form of pass-through certificates. Fannie Mae guarantees the
timely payment of principal and interest. Fannie Mae is authorized to borrow
from the U.S. Treasury to meet its obligations, but the certificates are not
backed by the full faith and credit of the U.S. Government.

The effective maturity of a mortgage-backed security may be shortened by
unscheduled or early payments of principal and interest on the underlying
mortgages, which may affect their effective yield. When the Government Bond Fund
receives the monthly "pass-through" payments (which may include unscheduled
prepayments of principal) it may be able to invest the payments only at a lower
rate of interest. During periods of declining interest rates, such securities


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                                       8
<PAGE>

therefore may be less effective as a means of "locking in" attractive long-term
interest rates and may have less potential for appreciation than conventional
bonds with comparable stated maturities.

The Fund may enter into repurchase agreements and, from time to time, may have
temporary investments in short-term debt obligations (including certificates of
deposit, bankers acceptances and commercial paper) pending the making of other
investments or for liquidity purposes.

The Fund may invest up to 15% of its net assets in securities which are
illiquid.

Obligations in which the Fund may invest include debt obligations of
supranational entities. Supranational entities include international
organizations designed or supported by governmental entities to promote economic
reconstruction or development and international banking institutions and related
government agencies. Obligations of supranational entities may be supported by
appropriated but unpaid commitments of their member countries, and there is no
assurance that these commitments will be undertaken or met in the future.

U.S. Government securities may be purchased or sold without regard to the length
of time they have been held to attempt to take advantage of short-term
differentials in yields, with the objective of seeking income while conserving
capital. While short-term trading increases portfolio turnover, the Government
Bond Fund incurs little or no brokerage costs for U.S. Government securities.

MONEY MARKET FUND

The Fund may invest in dollar-denominated obligations of foreign branches of
U.S. banks ("Euro dollars") and U.S. branches of foreign banks (if such U.S.
branches are subject to state banking requirements and Federal reserve reporting
requirements) which at the date of the investment have deposits of at least $1
billion as of their most recently published financial statements.

The Money Market Fund will not purchase any security unless (i) the security has
received the highest or second highest quality rating by at least two NRSROs or
by one NRSRO if only one has rated the security, or (ii) the security is unrated
and in the opinion of Allmerica Asset Management, Inc. ("AAM"), as Sub-Adviser
to the Fund, in accordance with guidelines adopted by the Trustees, is of a
quality comparable to one of the two highest ratings of an NRSRO. These
standards must be satisfied at the time an investment is made. If the quality of
the investment later declines, the Fund may continue to hold the investment, but
the Trustees will evaluate whether the security continues to present minimal
credit risks.

INVESTMENT RESTRICTIONS AND POLICIES

The following is a description of certain restrictions on investments of the
Funds (in addition to those described in the Prospectus). The investment
restrictions numbered 1 through 9 are fundamental and may not be changed without
the approval of a majority in interest of the shareholders of that Fund. The
other investment restrictions are not deemed fundamental and may be changed by
the Trustees without shareholder approval. The following investment restrictions
apply to each Fund, except as noted:

     1. The Fund will not issue "senior securities" as defined in Section 18(g)
of the Investment Company Act of 1940 ("1940 Act").

     2. The Fund will not borrow money, except in accordance with the provisions
of the 1940 Act and for temporary purposes when the aggregate amount borrowed
does not exceed 33 1/3% of the value of the Fund's total assets at the time
such borrowing is made. In general, a borrowing shall be regarded as being for
temporary purposes if it is repaid within 60 days and is not extended or
renewed.

     3. The Fund will not act as an underwriter except to the extent that, in
connection with the disposition of portfolio securities, it may be deemed to be
an underwriter under certain federal securities laws.


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       9
<PAGE>

     4. The Fund will not buy or sell real estate or interest in real estate,
although it may purchase and sell (a) securities which are secured by real
estate and (b) securities of companies which invest or deal in real estate.

     5. The Fund will not engage in the purchase and sale of physical
commodities or contracts relating to physical commodities.

     6. The Fund may make loans to other persons only through repurchase
agreements and securities lending. For purposes of this paragraph, the purchase
of an issue of publicly distributed bonds, debentures, or other debt securities,
whether or not the purchase was made upon the original issue of the securities,
is not to be considered the making of a loan by the Fund.

     7. The Fund will not purchase securities on margin but may obtain such
short-term credits as are necessary for clearance transactions, and (except for
the Money Market Fund) may make margin payments in connection with financial
futures (including securities index futures) contracts, and options on such
future contracts and in the case of the Select Capital Appreciation Fund,
futures contracts on foreign currencies and related options. The Fund will not
participate on a joint or joint and several basis in any trading account in
securities or effect a short sale of securities.

     *8. No Fund will concentrate its investments in particular industries,
including debt obligations of supranational entities and foreign governments,
but a Fund may invest up to 25% of the value of its total assets in a particular
industry. The restriction does not apply to investments in obligations issued or
guaranteed by the United States of America, its agencies or instrumentalities,
or to investments by the Money Market Fund in securities issued or guaranteed by
domestic branches of U.S. banks.

     *9. As to 75% of the value of its total assets (100% for the Money Market
Fund), no Fund will invest more than 5% of the value of its total assets in the
securities of any one issuer (other than securities issued by or guaranteed as
to principal or interest by the United States Government or any agency or
instrumentality thereof) or acquire more than 10% of the voting securities of
any issuer. The remaining 25% of assets (other than for the Money Market Fund)
may be invested in the securities of one or more issuers without regard to such
limitations.

     10. The Fund does not intend to invest in companies for the purpose of
exercising control or management.

     11. The Fund may invest in the securities of one or more other investment
companies, subject to the provisions of the 1940 Act, as amended, any other
applicable laws or regulations and any applicable exemptive orders issued by the
Securities and Exchange Commission.

     12. The Fund intends to purchase securities for investment and not to
purchase and sell them for trading purposes, except that the Select Capital
Appreciation Fund and the Government Bond Fund may engage in short term trading
of U.S. Government securities.

     13. The Fund (except the Money Market Fund) may engage in transactions in
financial futures contracts and related options. The Money Market Fund will not
engage in transactions in financial futures or related options.

     * These limitations apply as of the time of purchase. If through market
action the percentage limitations are exceeded, the Fund will not be required to
reduce the amount of its holdings in such investments.

INVESTMENT STRATEGIES AND TECHNIQUES

     In managing its portfolios of investments, the Trust may make use of the
following investment strategies and techniques:

SECURITIES LENDING

Each Fund may loan its portfolio securities to broker-dealers pursuant to
agreements requiring that the loans be continuously secured by cash, cash
equivalents or securities issued or guaranteed by the United States government
or its agencies, or any combination of cash, cash equivalents and such
securities as collateral equal at all times to at least 102%


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                                       10
<PAGE>

of the market value of the securities loaned. Such loans are not made if, as a
result, the aggregate of all outstanding loans would exceed 33 1/3% of the value
of the Fund's total assets taken at current value. The Fund continues to receive
interest or dividends on the securities loaned, and simultaneously earns
interest on the investment of the loan collateral in U.S. Treasury securities,
certificates of deposit or other high-grade, short-term obligations or interest-
bearing cash equivalents or receives a fee from the borrower. Although voting
rights, or rights to consent, attendant to securities lent pass to the borrower,
such loans may be called at any time and may be called so that the securities
may be voted by the Fund if a material event affecting the investment is to
occur. There may be risks of delay in recovery of the securities or even loss of
rights in the collateral should the borrower of the securities fail financially.
However, loans are made only to firms deemed by the Fund's Sub-Adviser to be of
good standing, and when, in the judgment of the Fund's Sub-Adviser, the
consideration which can be earned currently from such securities loans justifies
the attendant risk.

FOREIGN SECURITIES

Each Fund except the Government Bond Fund may purchase foreign securities. The
Money Market Fund may invest only in U.S. dollar denominated foreign securities.
Accordingly, the relative strength of the U.S. dollar may be an important factor
in the performance of the Fund, depending on the extent of the Fund's foreign
investments. Securities of foreign issuers, particularly non- governmental
issuers, involve risks which are not associated ordinarily with investing in
domestic issuers. These risks include changes in currency exchange rates and
currency exchange control regulations. In addition, investments in foreign
countries could be affected by other factors generally not thought to be present
in the United States, including the unavailability of financial information or
the difficulty of interpreting financial information prepared under foreign
accounting standards, less liquidity and more volatility in foreign markets, the
possibility of expropriation, the possibility of heavy taxation, the impact of
political, social or diplomatic developments, limitations on the removal of
funds or other assets of a Fund, difficulties in evoking legal process abroad
and enforcing contractual obligations, and the difficulty of assessing economic
trends in foreign countries. Some foreign securities exchanges may not be as
developed or efficient as those in the United States and securities traded on
foreign securities exchanges generally are subject to greater price volatility.
There is also the possibility of adverse changes in investment or exchange
control regulations, expropriation or confiscatory taxation and limitations on
the removal of funds or other assets.

Investments in emerging countries involve exposure to economic structures that
are generally less diverse and mature than in the United States, and to
political systems which may be less stable. In addition, securities of issuers
located in emerging countries may have limited marketability and may be subject
to more abrupt or erratic price fluctuations. The risk also exists that an
emergency situation may arise in one or more emerging markets as a result of
which trading of securities may cease or may be substantially curtailed and
prices for a Fund's portfolio securities in such markets may not be readily
available. Many emerging market countries have experienced high rates of
inflation for many years. Inflation and rapid fluctuations in inflation rates
have had and may continue to have negative effects on the economies and
securities markets of certain countries with emerging markets. Emerging markets
generally are heavily dependent upon international trade and, accordingly, have
been and may continue to be affected adversely by trade barriers, exchange
controls, managed adjustments in relative currency values and other
protectionist measures imposed by the countries with which they trade. In
certain markets there have been times when settlements of securities
transactions have been unable to keep pace with the volume of securities
transactions, making it difficult to conduct such transactions.

The Funds may buy or sell foreign currencies, options on foreign currencies and
foreign currency futures contracts and options thereon and, in addition, the
Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund and Select Income Fund may invest in foreign currency
forward contracts. Although such instruments may reduce the risk of loss due to
a decline in the value of the currency that is sold, they also limit any
possible gain which might result should the value of the currency increase. Such
instruments will be used primarily to protect a Fund from adverse currency
movements; however, they also involve the risk that anticipated currency
movements will not be accurately predicted, thus adversely affecting a Fund's
total return. See "Financial Futures Contracts and Related Options" and "Forward
Contracts on Foreign Currencies."

The Funds' investments may include ADRs. For many foreign securities, there are
U.S. dollar-denominated ADRs which are traded in the United States on exchanges
or over the counter. ADRs represent the right to receive securities of foreign
issuers deposited in a domestic bank or a correspondent bank. An ADR may be
sponsored by the issuer of the underlying foreign security, or it may be issued
in unsponsored form. The holder of a sponsored ADR is likely to receive more
frequent and extensive financial disclosure concerning the foreign issuer than
the holder of an unsponsored ADR


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       11
<PAGE>

and generally will bear lower transaction charges. Each Fund may invest in both
sponsored and unsponsored ADRs. The Select International Equity Fund and the
Select Capital Appreciation Fund also may utilize European Depositary Receipts,
which are designed for use in European securities markets, and also may invest
in Global Depositary Receipts.

Obligations in which the Select Income Fund, Select Investment Grade Income Fund
and Government Bond Fund may invest include debt obligations of supranational
entities. Supranational entities include international organizations designated
or supported by governmental entities to promote economic reconstruction or
development and international banking institutions and related government
agencies. Obligations of supranational entities may be supported by appropriated
but unpaid commitments of their member countries, and there is no assurance that
these commitments will be undertaken or met in the future. A Fund may not invest
more than 25% of its assets in debt obligations of supranational entities.

Certain state insurance regulations may impose additional restrictions on a
Fund's holdings of foreign securities.

FORWARD COMMITMENTS

The Select Capital Appreciation Fund, Select Income Fund, Select Investment
Grade Income Fund, Government Bond Fund and Money Market Fund may enter into
contracts to purchase securities for a fixed price at a specified future date
beyond customary settlement time ("forward commitments"). If the Funds do so,
they will maintain cash or other liquid obligations having a value in an amount
at all times sufficient to meet the purchase price. Forward commitments involve
a risk of loss if the value of the security to be purchased declines prior to
the settlement date. Although the Funds generally will enter into forward
commitments with the intention of acquiring securities for their portfolio, they
may dispose of a commitment prior to settlement if their Sub-Adviser deems it
appropriate to do so. The Funds may realize short-term gains or losses upon the
sale of forward commitments. The Sub-Adviser will monitor the creditworthiness
of the parties to such forward commitments.

WHEN-ISSUED SECURITIES

Each Fund from time to time may purchase securities on a "when-issued" basis or
delayed delivery basis. Debt securities and municipal obligations often are
issued on this basis. The yield of such securities is fixed at the time a
commitment to purchase is made, with actual payment and delivery of the security
generally taking place 15 to 45 days later. During the period between purchase
and settlement, typically no payment is made by a Fund and no interest accrues
to the Fund. The market value of when-issued securities may be more or less than
the purchase price payable at settlement date. Purchase of when-issued
securities involves the risk that yields available in the market when delivery
occurs may be higher than those available when the when-issued order is placed
resulting in a decline in the market value of the security. There is also the
risk that under some circumstances the purchase of when-issued securities may
act to leverage the Fund. The Fund will establish a segregated account with the
Custodian in which it will maintain cash or liquid securities at least equal to
commitments for when-issued securities.

REPURCHASE AGREEMENTS AND REVERSE REPURCHASE AGREEMENTS

Each Fund may enter into repurchase agreements. Under a repurchase agreement, a
Fund may purchase an obligation of or guaranteed by the United States
Government, its agents or instrumentalities, with an agreement that the seller
will repurchase the obligation at an agreed upon price and date. The repurchase
price reflects an agreed-upon interest rate which is unrelated to the coupon
rate on the purchased obligation. Repurchase agreements usually are for short
periods, such as under one week, but may be as long as thirty days. No
repurchase agreement will be effected if, as a result, more than 30% of a Fund's
total assets taken at current value will be invested in repurchase agreements.
No more than 15% (10% for the Money Market Fund) of a Fund's total assets taken
at current value will be invested in repurchase agreements extending for more
than seven days and in other securities which are not readily marketable.

If a seller defaults upon the obligation to repurchase, the Funds may incur a
loss if the value of the purchased obligation (collateral) declines, and may
incur disposition costs in liquidating the collateral. If bankruptcy proceedings


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are commenced with respect to a seller, realization upon the collateral by the
Funds may be delayed or limited.

Prior to entering into a repurchase agreement, the Fund's Sub-Adviser evaluates
the creditworthiness of entities with which the Fund proposes to enter into the
repurchase agreement. The Trustees have established guidelines and standards of
review for the evaluation of creditworthiness by the Funds' Sub- Advisers and
monitor such Sub-Advisers' actions with respect to repurchase transactions.

The Select Capital Appreciation Fund also may enter into reverse repurchase
agreements. In a reverse repurchase agreement, a fund sells a portfolio security
to another party, such as a bank or broker-dealer, in return for cash and agrees
to repurchase the instrument at a particular price and at a future date. Reverse
repurchase agreement transactions can be considered a form of borrowing by the
Fund. Reverse repurchase agreements may be used to provide cash to satisfy
unusually heavy redemption requests or for other temporary or emergency purposes
without the necessity of selling portfolio securities or to earn additional
income on portfolio securities, such as treasury bills and notes. While a
reverse repurchase agreement is outstanding, the Fund will maintain cash and
appropriate liquid assets in a segregated custodial account to cover its
obligation under the reverse repurchase agreement. The Select Capital
Appreciation Fund will enter into reverse repurchase agreements only with
parties that its Sub-Adviser deems creditworthy.

WRITING COVERED OPTIONS

Each Fund other than the Money Market Fund may write call options and put
options on securities which the Fund owns as its Sub-Adviser shall determine to
be appropriate and to the extent permitted by applicable law. A call option
gives the purchaser of the option the right to buy and a writer the obligation
to sell the underlying security at the exercise price at any time prior to the
expiration of the option, regardless of the market price of the security during
the option period. A premium is paid to the writer as the consideration for
undertaking the obligations under the option contract. The writer forgoes the
opportunity to profit from an increase in the market price of the underlying
security above the exercise price except insofar as the premium represents such
a profit.

As the writer of a call option, a Fund receives a premium for undertaking the
obligation to sell the underlying security at a fixed price during the option
period if the option is exercised. So long as the Fund remains obligated as the
writer of a call, it forgoes the opportunity to profit from increases in the
market price of the underlying security above the exercise price of the option,
except insofar as the premium represents such a profit, and retains the risk of
loss should the value of the security decline. The Fund also may enter into
"closing purchase transactions" in order to terminate its obligation as the
writer of a call option prior to the expiration of the option. There is no
assurance that a Fund will be able to effect such transactions at any particular
time or at any acceptable price.

The writer of a put option is obligated to purchase specified securities from
the option holder at a specified price at any time before the expiration date of
the option. The purpose of writing such options is to generate additional income
for the Fund, but the Fund accepts the risk that it will be required to purchase
the underlying securities at a price in excess of the securities' market value
at the time of purchase.

Option transactions may increase a Fund's transaction costs and may increase the
portfolio turnover rate, depending on how many options written by the Fund are
exercised in a particular year.

PURCHASING OPTIONS

Each Fund other than the Money Market Fund may purchase put and call options to
the extent permitted by applicable law. A Fund will not purchase put or call
options if after such purchase more than 5% of its net assets, as measured by
the aggregate of the premiums paid for all such options held by the Fund, would
be so invested. A Fund would also be able to enter into closing sale
transactions in order to realize gains or minimize losses on exchange traded
options purchased by the Fund.

A Fund normally would purchase call options in anticipation of an increase in
the market value of securities. The purchase of a call option entitles the Fund,
in return for the premium paid, to purchase specified securities at a specified


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price during the option period. If the value of such securities exceeded the sum
of the exercise price, the premium paid and transaction costs during the option
period, the Fund would ordinarily realize a gain, if not, the Fund would realize
a loss.

A Fund normally would purchase put options in anticipation of a decline in the
market value of securities in its portfolio ("protective puts") or securities of
the type in which it may invest. The purchase of a put option would entitle the
Fund, in exchange for the premium paid, to sell specified securities at a
specified price during the option period. Gains or losses on the purchase of put
options would tend to be offset by countervailing changes in the value of
underlying portfolio securities. A Fund ordinarily would realize a gain if,
during the option period, the value of the underlying securities decreased below
the exercise price sufficiently to cover the premium and transaction costs;
otherwise, the Fund would realize a loss on the purchase of the put option.

There is no assurance that a liquid secondary market on an options exchange will
exist for a particular option or at a particular time. The hours of trading for
options on options exchanges may not conform to the hours during which the
underlying securities are traded. To the extent that the option markets close
before the markets for the underlying securities, significant price and rate
movements can take place in the underlying securities markets that cannot be
reflected in the option markets. In addition, the purchase of options is a
highly specialized activity which depends in part on the Sub-Adviser's ability
to predict future price fluctuations and the degree of correlation between the
options and securities markets. A Fund pays brokerage commission or spread in
connection with its options transactions as well as for purchases and sales of
the underlying securities.

FINANCIAL FUTURES CONTRACTS AND RELATED OPTIONS

Each Fund (other than the Money Market Fund) may invest in transactions in
financial futures contracts and related options for hedging purposes. In
addition, the Select Emerging Markets Fund, Select Capital Appreciation Fund,
Select International Equity Fund, Select Growth Fund and Select Income Fund may
utilize futures contracts on foreign currencies and related options. Through
certain hedging activities involving such futures contracts and related options,
it is possible to reduce the effects of fluctuations in interest rates and the
market prices of securities which may be quite volatile. Hedging is a means of
transferring a risk which an investor does not desire to assume during an
uncertain interest rate or securities market environment to another investor who
is willing to assume that risk.

The Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund, Select Growth Fund and Select Income Fund may buy and
write options on foreign currencies in a manner similar to that in which futures
or forward contracts on foreign currencies will be utilized. For example, a
decline in the U.S. dollar value of a foreign currency in which portfolio
securities are denominated will reduce the U.S. dollar value of such securities,
even if their value in the foreign currency remains constant. In order to
protect against such diminutions in the value of portfolio securities, the
Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund, Select Growth Fund and Select Income Fund may buy put
options on the foreign currency. If the value of the currency declines, the
Funds will have the right to sell such currency for a fixed amount in U.S.
dollars and will offset, in whole or in part, the adverse effect on its
portfolio.

Conversely, when a rise in the U.S. dollar value of a currency in which
securities to be acquired are denominated is projected, thereby increasing the
cost of such securities, the Select Emerging Markets Fund, Select Capital
Appreciation Fund, Select International Equity Fund, Select Growth Fund and
Select Income Fund may buy call options thereon. The purchase of such options
could offset, at least partially, the effects of the adverse movements in
exchange rates. As in the case of other types of options, however, the benefit
to the Funds from purchases of foreign currency options will be reduced by the
amount of the premium and related transaction costs. In addition, if currency
exchange rates do not move in the direction or to the extent desired, the Select
Emerging Markets Fund, Select Capital Appreciation Fund, Select International
Equity Fund, Select Growth Fund and Select Income Fund could sustain losses on
transactions in foreign currency options that would require such Funds to forgo
a portion or all of the benefits of advantageous changes in those rates.

The Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund, Select Growth Fund and Select Income Fund also may
write options on foreign currencies. For example, to hedge against a potential
decline in the U.S. dollar value of foreign currency denominated securities due
to adverse fluctuations in


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exchange rates, the Funds could write a call option on the relevant currency
instead of purchasing a put option. If the expected decline occurs, the option
will most likely not be exercised and the diminution in value of portfolio
securities will be offset by the amount of the premium received.

Similarly, instead of purchasing a call option to hedge against a potential
increase in the U.S. dollar cost of securities to be acquired, the Select
Emerging Markets Fund, Select Capital Appreciation Fund, Select International
Equity Fund, Select Growth Fund and Select Income Fund could write a put option
on the relevant currency which, if rates move in the manner projected, will
expire unexercised and allow the Funds to hedge the increased cost up to the
amount of the premium. As in the case of other types of options, however, the
writing of a foreign currency option will constitute only a partial hedge up to
the amount of the premium. If exchange rates do not move in the expected
direction, the option may be exercised and the Funds would be required to buy or
sell the underlying currency at a loss which may not be offset by the amount of
the premium. Through the writing of options on foreign currencies, the Select
Emerging Markets Fund, Select Capital Appreciation Fund, Select International
Equity Fund, Select Growth Fund and Select Income Fund also may lose all or a
portion of the benefits which might otherwise have been obtained from favorable
movements in exchange rates.

The Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund, Select Growth Fund and Select Income Fund may write
covered call options on foreign currencies. A call option written on a foreign
currency by the Funds is "covered" if the Funds own the underlying foreign
currency covered by the call or have an absolute and immediate right to acquire
that foreign currency without additional cash consideration (or for additional
cash consideration held in a segregated account by the Fund's custodian) upon
conversion or exchange of other foreign currency held in their portfolios. A
call option also is covered if the Funds have a call on the same foreign
currency and in the same principal amount as the call written if the exercise
price of the call held (i) is equal to or less than the exercise price of the
call written or (ii) is greater than the exercise price of the call written, if
the difference is maintained by the Funds in cash or other liquid assets in a
segregated account with the Funds' custodian.

The Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund, Select Growth Fund and Select Income Fund also may
write call options on foreign currencies for cross-hedging purposes that would
not be deemed to be covered. A call option on a foreign currency is for cross-
hedging purposes if it is not covered but is designed to provide a hedge against
a decline due to an adverse change in the exchange rate in the U.S. dollar value
of a security that the Funds own or have the right to acquire and that is
denominated in the currency underlying the option. In such circumstances, the
Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund, Select Growth Fund and Select Income Fund
collateralize the option by segregating cash or other liquid assets in an amount
not less than the value of the underlying foreign currency in U.S. dollars
marked-to-market daily. The Select Emerging Markets Fund, Select Capital
Appreciation Fund, Select International Equity Fund, Select Growth Fund and
Select Income Fund may invest without limitation in foreign currency options.

GENERAL INFORMATION

A futures contract on a security is a standardized agreement under which each
party is entitled and obligated either to make or to accept delivery, at a
particular time, of securities having a specified face value and rate of return
on foreign currencies. Currently, futures contracts are available on debt and
equity securities and on certain foreign currencies.

Futures contracts are traded on exchanges that are licensed and regulated by the
Commodity Futures Trading Commission ("CFTC"). A futures contract on an
individual security may be deemed to be a commodities contract. A Fund engaging
in a futures transaction initially will be required to deposit and maintain with
its Custodian, in the name of its brokers, an amount of cash or U.S. Treasury
bills equal to a small percentage (generally less than 5%) of the contract
amount to guarantee performance of its obligations. This amount is known as
"initial margin." Margin in a futures transaction is different from margin in a
securities transaction, in that financial futures initial margin does not
involve the borrowing of funds to finance the transactions. Unlike securities
margin, initial margin in a futures transaction is in the nature of a
performance bond or good faith deposit on the contract which is returned to the
fund upon termination of the financial future, assuming all contractual
obligations have been satisfied. As the price of the underlying security
fluctuates, making the position in the financial futures more or less valuable,
subsequent payments called "maintenance margin" or "variation margin" are made
to and from the broker on a daily basis. This process is called "marking to
market."


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The purchase and sale of financial futures is for the purpose of hedging against
changes in securities prices or interest rates. Hedging transaction serve as a
substitute for transactions in the underlying securities and can effectively
reduce investment risk. When prices are expected to rise, a fund, through the
purchase of futures contracts, can attempt to secure better prices than might be
later available in the stock market when it anticipates effecting purchases.

Similarly, when interest rates are expected to increase, a fund can seek to
offset a decline in the value of its debt securities through the sale of futures
contracts.

OPTIONS ON FINANCIAL FUTURES

The Funds other than the Money Market Fund may use options on futures contracts
in connection with hedging strategies. The purchase of put options on futures
contracts is a means of hedging the Fund's portfolio against the risk of
declining prices. The purchase of a call option on a futures contract represents
a means of hedging against a market advance when a Fund is not invested fully.
Depending on the pricing of the option compared with either the futures contract
upon which it is based or upon the price of the underlying securities, the
option may or may not be less risky than ownership of the futures contract or
underlying securities.

The writing of a call option on a futures contract may constitute a partial
hedge against declining prices of the securities or currencies which are
deliverable upon exercise of the futures contract. If the futures price at
expiration is below the exercise price, a Fund will retain the full amount of
the option premium, which provides a partial hedge against any decline that may
have occurred in the Fund's holding of securities or currencies.

The writing of a put option on a futures contract is analogous to the purchase
of a futures contract. If the option is exercised, the net cost to the Fund of
the securities or currencies acquired by it will be reduced by the amount of the
option premium received. If, however, market prices have declined, the Fund's
purchase price upon exercise may be greater than the price at which the
securities or currencies might be purchased in the cash market.

LIMITATIONS ON PURCHASE AND SALE OF FUTURES AND RELATED OPTIONS

A Fund generally will engage in transactions in futures contracts or related
options only as a hedge against changes in the values of securities or
currencies held in a Fund's portfolio or which it intends to purchase, or to a
limited extent to engage in non-hedging strategies. A Fund may not purchase or
sell a futures contract for non-hedging purposes if immediately thereafter the
sum of the amount of margin deposits and amount of variation margins paid from
time to time on the Fund's existing futures and related options positions and
premiums paid for related options would exceed 5% of the market value of the
Fund's total assets. The reasons a Fund may engage in non-hedging strategies
include: to seek to enhance return and to adjust efficiently the Fund's overall
exposure to certain markets. In instances involving the purchase of futures
contracts or call options thereon or the writing of put options thereon by a
Fund, an amount of cash and cash equivalents, equal to the market value of the
futures contracts and related options (less any related margin deposits), will
be deposited in a segregated account with its custodian in the name of the
broker to collateralize the position, and thereby insure that the use of such
futures contracts and options is unleveraged.

In implementing a Fund's overall risk management strategy, it is possible that
its Sub-Adviser will choose not to engage in any futures transactions or that
appropriate futures contracts or related options may not be available. A Fund
will engage in futures transactions only for appropriate hedging, risk
management or non-hedging purposes. A Fund will not enter into any particular
futures transaction unless its Sub-Adviser determines that the particular
transaction demonstrates an appropriate correlation with the Fund's investment
objectives and portfolio securities.

RISK OF TRANSACTIONS IN FUTURES

The sale and purchase of futures contracts is a highly specialized activity
which involves investment techniques and risks different from those associated
with ordinary portfolio securities transactions. There are several risks in
connection with the use of financial futures by a Fund as a hedging device.


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Successful use of financial futures by a Fund is subject to its Sub- Adviser's
ability to predict movements in the direction of interest rates or securities
prices and to assess other factors affecting markets for securities. For
example, a Fund may hedge against the possibility of an increase in interest
rates which would affect adversely the prices of debt securities held in its
portfolio. If prices of the debt securities increase instead, the Fund may lose
part or all of the benefit of the increased value of the hedged debt securities
because it may have offsetting losses in the futures positions. In addition, in
this situation, if the Fund has insufficient cash, it may have to sell
securities to meet the daily maintenance margin requirements. These sales may
be, but will not necessarily be, at increased prices to reflect the rising
market. The Fund may have to sell securities at a time when it may be
disadvantageous to do so.

Another risk arises because of the imperfect correlation between movements in
the price of the financial future and movements in the price of the securities
or currencies which are the subject of the hedge. First of all, the hours of
trading for futures contracts may not conform to the hours during which the
underlying assets are traded. To the extent that the futures markets close
before the markets for the underlying assets, significant price and rate
movements can take place in the underlying asset's market that cannot be
reflected in the futures markets. But even during identical trading hours, the
price of the future may move more than or less than the price of the assets
being hedged. While a hedge will not be fully effective if the price of the
future moves less that the price of the hedged assets, if the price of the
hedged assets has moved in an unfavorable direction, the Fund would be in a
better position than if it had not hedged at all. On the other hand, if the
price of the hedged assets has moved in a favorable direction, this advantage
may be offset partially by the price movement of the futures contract. If the
price of the futures moves more than the price of the asset, the Fund will
experience either a loss or a gain on the futures contract which will not be
completely offset by movements in the prices of the assets which are the subject
of the hedge.

In addition to the possibility that there may be an imperfect correlation at
all, between movements in the futures and the portion of the portfolio being
hedged, the market prices of the futures may be affected by certain other
factors. First, all participants in the futures market are subject to margin
deposit and maintenance requirements. Rather than meeting additional margin
deposit requirements, investors may close futures through offsetting
transaction, which could distort the normal relationship between securities or
currencies and futures markets. Secondly, from the point of view of speculators,
the deposit requirements in the futures market are less onerous than margin
requirements in the securities market. Therefore, increased participation by
speculators in the futures market may also cause temporary price or currency
distortions. Due to the possibility of price distortion in the futures market
and because of the imperfect correlation between movements in the prices of
securities or currencies and movements in the prices of futures, a correct
forecast of interest rate trends or market price movements by the Sub-Adviser
still may not result in a successful hedging transaction over a short time
frame.

Positions in futures contracts may be closed out only on an exchange or board of
trade which provides a secondary market for such futures. Although the Funds
intend to purchase or sell futures only on exchanges or boards of trade where
there appears to be an active secondary market, there is no assurance that a
liquid secondary market on an exchange or board of trade will exist for any
particular contract or at any particular time. Thus, it may not be possible to
close a futures position, and, in the event of adverse price movements, the Fund
would continue to be required to make daily cash payments of maintenance margin.
However, in the event futures have been used to hedge portfolio positions, such
underlying assets will not be sold until the futures can be terminated. In such
circumstances, an increase in the price of the underlying assets, if any, may
offset partially or completely losses on the future.

RISKS OF TRANSACTIONS IN OPTIONS ON FUTURES

There are several special risks relating to options on futures. First, the
ability to establish and close out positions in options is subject to the
maintenance of a liquid secondary market. A Fund will not purchase options on
futures on any exchange or board of trade unless, in the opinion of its Sub-
Adviser, the market for such options is developed sufficiently so that the risks
in connection with options on futures transactions are not greater than the
risks in connection with futures transactions. Compared with the purchase or
sale of futures, the purchase of call or put options on futures involves less
potential risk to the Fund because the maximum amount at risk is the premium
paid for the options (plus transaction costs). However, there may be
circumstances when the purchase of a call or put option on futures would result
in a loss to the Fund when the purchase or sale of a future would not, such as
when there is no


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movement in the price of the underlying securities. The writing of an option on
a futures contract involves risks similar to those risks relating to the sale of
futures contracts, as described above under "Risks of Transactions in Futures."

An option position may be closed out only on an exchange or board of trade which
provides a secondary market for an option of the same series. Although a Fund
generally will purchase only those options for which there appears to be an
active secondary market, there is no assurance that a liquid secondary market
will exist for any particular option or at any particular time. It might not be
possible to effect closing transactions in particular options, with the result
that the Fund would have to exercise its options in order to realize any profit
and would incur transaction costs upon the sale of financial futures pursuant to
the exercise of put options.

Because of the risks and the transaction costs associated with hedging
activities, there can be no assurance that a Fund's portfolio will perform as
well as or better than a comparable fund that does not invest in futures
contracts or related options.

FORWARD CONTRACTS ON FOREIGN CURRENCIES

A forward contract is an agreement between two parties in which one party is
obligated to deliver a stated amount of a stated asset at a specified time in
the future and the other party is obligated to pay a specified invoice amount
for the assets at the time of delivery. The Select Emerging Markets Fund, Select
Capital Appreciation Fund, Select International Equity Fund, Select Growth Fund
and Select Income Fund may enter into forward contracts to purchase and sell
government securities, foreign currencies or other financial instruments.
Forward contracts generally are traded in an interbank market conducted directly
between traders (usually large commercial banks) and their customers. Unlike
futures contracts which are standardized contracts, forward contracts can be
drawn specifically to meet the needs of the parties that enter into them. The
parties to a forward contract may agree to offset or terminate the contract
before its maturity, or may hold the contract to maturity and complete the
contemplated exchange. The following discussion summarizes the Select Emerging
Markets Fund's, Select Capital Appreciation Fund's, Select International Equity
Fund's, Select Growth Fund's and Select Income Fund's principal uses of forward
currency exchange contracts ("forward currency contracts"). The Funds may enter
into a forward currency contract with the stated contract value of up to the
value of the Funds' assets. A forward currency contract is an obligation to buy
or sell an amount of a specified currency for an agreed price (which may be in
U.S. dollars or a foreign currency). The Select Emerging Markets Fund, Select
Capital Appreciation Fund, Select International Equity Fund, Select Growth Fund
and Select Income Fund will exchange foreign currencies for U.S. dollars and for
other foreign currencies in the normal course of business and may buy and sell
currencies through forward currency contracts in order to fix a price for
securities they have agreed to buy or sell ("transaction hedge"). The Select
Emerging Markets Fund, Select Capital Appreciation Fund, Select International
Equity Fund, Select Growth Fund and Select Income Fund also may hedge some or
all of their investments denominated in foreign currency against a decline in
the value of that currency relative to the U.S. dollar by entering into forward
currency contracts to sell an amount of that currency (or a proxy currency whose
performance is expected to replicate or exceed the performance of that currency
relative to the U.S. dollar) approximating the value of some or all of their
portfolio securities denominated in that currency ("position hedge") or by
participating in options or futures contracts with respect to the currency. The
Funds also may enter into a forward currency contract with respect to a currency
where the Funds are considering the purchase or sale of investments denominated
in that currency but have not yet selected the specific investments
("anticipatory hedge").

In any of these circumstances, the Select Emerging Markets Fund, Select Capital
Appreciation Fund, Select International Equity Fund, Select Growth Fund and
Select Income Fund may enter alternatively into a forward currency contract to
purchase or sell one foreign currency for a second currency that is expected to
perform more favorably relative to the U.S. dollar if their Sub-Advisers believe
there is a reasonable degree of correlation between movements in the two
currencies ("cross-hedge").

These types of hedges minimize the effect of currency appreciation as well as
depreciation, but do not eliminate fluctuations in the underlying U.S. dollar
equivalent value of the proceeds of or rates of return on such Funds' foreign
currency denominated portfolio securities. The matching of the increase in value
of a forward contract and the decline in the U.S. dollar equivalent value of the
foreign currency denominated asset that is the subject of the hedge generally
will not be precise. Shifting the Funds' currency exposure from one foreign
currency to another removes the Funds' opportunity to profit from increases in
the value of the original currency and involves a risk of increased losses to
the Funds if their Sub-Advisers' projections of future exchange


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<PAGE>

rates is inaccurate. Proxy hedges and cross-hedges may result in losses if the
currency used to hedge does not perform similarly to the currency in which
hedged securities are denominated. Unforeseen changes in currency prices may
result in poorer overall performance for the Select Emerging Markets Fund,
Select Capital Appreciation Fund, Select International Equity Fund, Select
Growth Fund and Select Income Fund than if they had not entered into such
contracts.

The Select Emerging Markets Fund, Select Capital Appreciation Fund, Select
International Equity Fund, Select Growth Fund and Select Income Fund will cover
outstanding forward currency contracts by maintaining liquid portfolio
securities denominated in or whose value is tied to the currency underlying the
forward contract or the currency being hedged. To the extent that the Select
Emerging Markets Fund, Select Capital Appreciation Fund, Select International
Equity Fund, Select Growth Fund and Select Income Fund are not able to cover
their forward currency positions with underlying portfolio securities, the
Funds' custodian will segregate cash or liquid assets having a value equal to
the aggregate amount of its commitments under forward contracts entered into
with respect to position hedges, cross-hedges and anticipatory hedges. If the
value of the securities used to cover a position or the value of segregated
assets declines, the Select Emerging Markets Fund, Select Capital Appreciation
Fund, Select International Equity Fund, Select Growth Fund and Select Income
Fund will find alternative cover or segregate additional cash or liquid assets
on a daily basis so that the value of the covered segregated assets will be
equal to the amount of the Funds' commitments with respect to such contracts. As
an alternative to segregating assets, the Select Emerging Markets Fund, Select
Capital Appreciation Fund, Select International Equity Fund, Select Growth Fund
and Select Income Fund may buy call options permitting it to buy the amount of
foreign currency being hedged by a forward sale contract or the Funds may buy
put options permitting them to sell the amount of foreign currency subject to a
forward buy contract.

While forward contracts currently are not regulated by the CFTC, the CFTC may in
the future assert authority to regulate forward contracts. In such event, the
Select Emerging Markets Fund's, Select Capital Appreciation Fund's, Select
International Equity Fund's, Select Growth Fund's and Select Income Fund's
ability to utilize forward contracts may be restricted. In addition, the Select
Emerging Markets Fund, Select Capital Appreciation Fund, Select International
Equity Fund, Select Growth Fund and Select Income Fund may not always be able to
enter into forward contracts at attractive prices and may be limited in their
ability to use these contracts to hedge portfolio assets.

SWAP AND SWAP-RELATED PRODUCTS

The Select Capital Appreciation Fund may enter into interest rate swaps, caps,
and floors on either an asset-based or liability-based basis, depending upon
whether it is hedging its assets or its liabilities, and will usually enter into
interest rate swaps on a net basis (i.e., the two payment streams are netted out
with the Fund receiving or paying, as the case may be, only the net amount of
the two payments). Interest rate swaps involve the exchange by the Fund with
another party of their respective commitments to pay or receive interest; for
example, an exchange of floating rate payments for fixed rate payments with
respect to a notional amount of principal. A currency swap is an agreement to
exchange cash flows on a notional amount of two or more currencies based on the
relative value differential among them. An index swap is an agreement to swap
cash flows on a notional amount based on changes in the values of the reference
indices. The purchase of a cap entitles the purchaser to receive payments on a
notional principal amount from the party selling such cap to the extent that a
specified index exceeds a predetermined interest rate or amount. The purchase of
a floor entitles the purchaser to receive payments on a notional principal
amount from the party selling such floor to the extent that a specified index
falls below a predetermined interest rate or amount.

The net amount of the excess, if any, of the Fund's obligations over its
entitlement with respect to each interest rate swap will be calculated on a
daily basis and an amount of cash or other liquid assets having an aggregate net
asset value at least equal to the accrued excess will be maintained in a
segregated account by the Fund's custodian. If the Fund enters into an interest
rate swap on other than a net basis, it will maintain a segregated account in
the full amount accrued on a daily basis of its obligations with respect to the
swap. The Fund will not enter into any interest rate swap, cap or floor
transaction unless the unsecured senior debt or the claims-paying ability of the
other party thereto is rated in one of the three highest rating categories of at
least one nationally recognized statistical rating organization at the time of
entering into such transaction. The Sub-Adviser will monitor the
creditworthiness of all counterparties on an ongoing basis. If there is a
default by the other party to such a transaction, the Fund will have contractual
remedies pursuant to the agreement related to the transaction.

The swap market has grown substantially in recent years with a large number of
banks and investment banking firms acting both as principals and as agents
utilizing standardized swap documentation. As a result, the swap market has
become relatively liquid. Caps and floors are more recent innovations for which
standardized documentation has not yet


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       19
<PAGE>

been developed and, accordingly, they are less liquid than swaps. To the extent
the Fund sells (i.e., writes) caps and floors, it will segregate cash or high-
grade liquid assets having an aggregate net asset value at least equal to the
full amount on a daily basis of its obligations with respect to any caps or
floors.

There is no limit on the amount of interest rate swap transactions that may be
entered into by the Fund. These transactions may in some instances involve the
delivery of securities or other underlying assets to the Fund or its
counterparty to collateralize obligations under the swap. Under the
documentation currently used in those markets, the risk of loss with respect to
interest rates swaps is limited to the net amount of the payments that the Fund
is obligated contractually to make. If the other party to an interest rate swap
that is not collateralized defaults, the Fund would risk the loss of the net
amount of the payments that it contractually is entitled to receive. The Fund
may buy and sell (i.e., write) caps and floors without limitation, subject to
the segregation requirement described above.

ADDITIONAL RISKS OF OPTIONS ON FOREIGN CURRENCIES, FORWARD CONTRACTS AND FOREIGN
INSTRUMENTS

Unlike transactions entered into by the Funds in futures contracts, options on
foreign currencies and forward contracts are not traded on contract markets
regulated by the CFTC or (with the exception of certain foreign currency
options) by the SEC. To the contrary, such instruments are traded through
financial institutions acting as market-makers, although foreign currency
options also are traded on certain exchanges, such as the Philadelphia Stock
Exchange and the Chicago Board Options Exchange, subject to SEC regulation.
Similarly, options on currencies may be traded over-the-counter. In an over-the-
counter trading environment, many of the protections afforded to exchange
participants will not be available. For example, there are no daily price
fluctuation limits, and adverse market movements therefore could continue to an
unlimited extent over a period of time. Although the buyer of an option cannot
lose more than the amount of the premium plus related transaction costs, this
entire amount could be lost. Moreover, an option writer and a buyer or seller of
futures or forward contracts could lose amounts substantially in excess of any
premium received or initial margin or collateral posted due to the potential
additional margin and collateral requirements associated with such positions.

Options on foreign currencies traded on exchanges are within the jurisdiction of
the SEC, as other securities traded on such exchanges. As a result, many of the
protections provided to traders on organized exchanges will be available with
respect to such transactions. In particular, all foreign currency option
positions entered into on an exchange are cleared and guaranteed by the Office
of the Comptroller of the Currency ("OCC"), thereby reducing the risk of
counterparty default. Further, a liquid secondary market in options traded on an
exchange may be more readily available than in the over-the-counter market,
potentially permitting a Fund to liquidate open positions at a profit prior to
exercise or expiration, or to limit losses in the event of adverse market
movements.

The purchase and sale of exchange-traded foreign currency options, however, is
subject to the risks of the availability of a liquid secondary market described
above, as well as the risks regarding adverse market movements, margining of
options written, the nature of the foreign currency market, possible
intervention by governmental authorities and the effects of other political and
economic events. In addition, exchange-traded options on foreign currencies
involve certain risks not presented by the over-the-counter market. For example,
exercise and settlement of such options must be made exclusively through the OCC
which has established banking relationships in applicable foreign countries for
this purpose. As a result, the OCC, if it determines that foreign government
restrictions or taxes would prevent the orderly settlement of foreign currency
option exercises or would result in undue burdens on the OCC or its clearing
member, may impose special procedures on exercise and settlement, such as
technical changes in the mechanics of delivery, the fixing of dollar settlement
prices or prohibitions on exercise.

In addition, options on U.S. Government securities, futures contracts, options
on futures contracts, forward contracts and options on foreign currencies may be
traded on foreign exchanges and over-the-counter in foreign countries. Such
transactions are subject to the risk of governmental actions affecting trading
in or the prices of foreign currencies or securities. The value of such
positions also could be adversely affected by (i) other complex foreign
political and economic factors (ii) lesser availability than in the United
States of data on which to make trading decisions, (iii) delays in a Fund's
ability to act upon economic events occurring in foreign markets during
non-business hours in the United States, (iv) the imposition of different
exercise and settlement terms and procedures and margin requirements from those
in the United States and (v) low trading volume.


- ------------------------------
Allmerica Investment Trust

                                       20
<PAGE>

RESTRICTED SECURITIES

Each Fund may invest up to 15% (10% for the Money Market Fund) of its net assets
in restricted securities (and securities deemed to be illiquid) unless the Board
of Trustees determines that such restricted securities are liquid. The Board of
Trustees has adopted guidelines and delegated to Allmerica Financial Investment
Management Services, Inc. (the "Manager" or "AFIMS") the daily function of
determining and monitoring liquidity of restricted securities. The Board,
however, will retain sufficient oversight and be responsible ultimately for the
determinations. Since it is not possible to predict with assurance exactly how
this market for restricted securities sold and offered under Rule 144A will
develop, the Board will monitor carefully a Fund's investments in securities,
focusing on such important factors, among others, as valuation, liquidity and
availability of information. Because market quotations are less readily
available, judgment at times may play a greater role in valuing these securities
than in the case of unrestricted securities.

INVESTMENTS IN MONEY MARKET SECURITIES

Each Fund may hold at least a portion of its assets in cash equivalents or money
market instruments. There is always the risk that the issuer of a money market
instrument may be unable to make payment upon maturity.

The Money Market Fund may hold uninvested cash reserves pending investment
during temporary, defensive periods or if, in the opinion of the Sub-Adviser,
suitable securities are not available for investment. Securities in which the
Money Market Fund may invest may not earn as high a level of current income as
long-term, lower quality securities which, however, generally have less
liquidity, greater market risk and more fluctuation in market value.

HIGH YIELD SECURITIES

Corporate debt securities purchased by the Select Emerging Markets Fund, Select
Capital Appreciation Fund, Select Growth Fund, Select Growth and Income Fund and
Select Income Fund will be rated at the time of purchase B or better by Moody's
or S&P, or equivalently rated by another NRSRO, or unrated but believed by the
Sub-Adviser to be of comparable quality under the guidelines established for the
Funds. The Select Growth Fund and the Select Growth and Income Fund may not
invest more than 15% of their assets, the Select Income Fund and the Select
Capital Appreciation Fund may not invest more than 25% of their assets and the
Select Emerging Markets Fund may not invest more than 35% of its assets at the
time of investment in securities rated below Baa by Moody's or BBB by S&P, or
equivalently rated by another NRSRO, or unrated but believed by the Sub-Adviser
to be of comparable quality. Securities rated B by Moody's or S&P (or
equivalently by another NRSRO) are below investment grade and are considered, on
balance, to be predominantly speculative with respect to capacity to pay
interest and repay principal and will generally involve more credit risk than
securities in the higher rating categories.

Periods of economic uncertainty and changes can be expected to result in
increased volatility of market prices of lower-rated securities, commonly known
as "high yield" securities or "junk bonds," and of the asset value of the Select
Emerging Markets Fund, Select Capital Appreciation Fund, Select Growth Fund,
Select Growth and Income Fund and Select Income Fund. Many issuers of high yield
corporate debt securities are leveraged substantially at times, which may impair
their ability to meet debt service obligations. Also, during an economic
downturn or substantial period of rising interest rates, highly leveraged
issuers may experience financial stress.

The lack of a liquid secondary market in certain lower-rated securities may have
an adverse impact on their market price and the ability of a Fund to dispose of
particular issues when necessary to meet its liquidity needs or in response to a
specific economic event such as a deterioration in the credit- worthiness of the
issuer. In addition, a less liquid market may interfere with the ability of a
Fund to value accurately high yield securities and, consequently, value a Fund's
assets. Furthermore, adverse publicity and investor perceptions may decrease the
value and liquidity of high yield securities. It is reasonable to expect any
recession to disrupt severely the market for high yield fixed-income securities,
have an adverse impact on the value of such securities and adversely affect the
ability of the issuers of such securities to repay principal and pay interest
thereon. The market prices of lower-rated securities are generally less
sensitive to interest rate changes than higher-rated investments, but more
sensitive to adverse economic or political changes or individual developments
specific to the issuer. Periods of economic or political uncertainty and change
can be expected to result in volatility of prices of these securities.


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       21
<PAGE>

The Funds also may invest in unrated debt securities of foreign and domestic
issuers. Unrated debt, while not necessarily of lower quality than rated
securities, may not have as broad a market. Sovereign debt of foreign
governments generally is rated by country. Because these ratings do not take
into account individual factors relevant to each issue and may not be updated
regularly, the Sub-Adviser may treat such securities as unrated debt. Unrated
debt securities and securities with different ratings from more than one agency
will be included in the 15%, 25% and 35% limits of the Funds as stated above,
unless such Fund's Sub-Adviser deems such securities to be the equivalent of
investment grade securities.

ASSET-BACKED SECURITIES

The Core Equity Fund, Select Growth and Income Fund, Select Income Fund, Select
Investment Grade Income Fund, Government Bond Fund and Money Market Fund may
purchase asset-backed securities, which represent a participation in, or are
secured by and payable from, a stream of payments generated by particular
assets, frequently a pool of assets similar to one another. Assets generating
such payments include instruments such as motor vehicle installment purchase
obligations, credit card receivables and home equity loans. Payment of principal
and interest may be guaranteed for certain amounts and time periods by a letter
of credit issued by a financial institution unaffiliated with the issuer of the
securities. The estimated life of an asset-backed security varies with the
prepayment experience of the underlying debt instruments. The rate of such
prepayments, and hence the life of the asset-backed security, will be primarily
a function of current market rates, although other economic and demographic
factors will be involved. Under certain interest rate and prepayment rate
scenarios, the Funds may fail to recoup fully their investment in asset-backed
securities. A Fund will not invest more than 20% of its total assets in asset-
backed securities.

MORTGAGE-BACKED SECURITIES

The Select Income Fund, Select Investment Grade Income Fund and Government Bond
Fund may invest in mortgage-backed securities which are debt obligations secured
by real estate loans and pools of loans on single family homes, multi-family
homes, mobile homes and, in some cases, commercial properties. The Funds may
acquire securities representing an interest in a pool of mortgage loans that are
issued or guaranteed by a U.S. government agency such as Ginnie Mae, Fannie Mae
and Freddie Mac.

Mortgage-backed securities are in most cases "pass-through" instruments through
which the holder receives a share of all interest and principal payments from
the mortgages underlying the certificate. Because the prepayment characteristics
of the underlying mortgages vary, it is not possible to predict accurately the
average life or realized yields of a particular issue of pass- through
certificates. During periods of declining interest rates, prepayment of
mortgages underlying mortgage-backed securities can be expected to accelerate.
When the mortgage obligations are prepaid, the Funds reinvest the prepaid
amounts in securities, the yield of which reflects interest rates prevailing at
the time. Moreover, prepayment of mortgages that underlie securities purchased
at a premium could result in losses.

The Funds also may invest in multiple class securities issued by U.S. government
agencies and instrumentalities such as Fannie Mae, Freddie Mac and Ginnie Mae,
including guaranteed collateralized mortgage obligations ("CMOs") and Real
Estate Mortgage Investment Conduit ("REMIC") pass-through or participation
certificates, when consistent with the Funds' investment objective, policies and
limitations. A CMO is a type of bond secured by an underlying pool of mortgages
or mortgage pass-through certificates that are structured to direct payment on
underlying collateral to different series or classes of obligations. A REMIC is
a CMO that qualifies for special tax treatment under the Internal Revenue Code
and invests in certain mortgages principally secured by interests in real
property and other permitted investments.

CMOs and guaranteed REMIC pass-through certificates ("REMIC Certificates")
issued by Fannie Mae, Freddie Mac and Ginnie Mae are types of multiple pass-
through securities. Investors may purchase beneficial interests in REMICs, which
are known as "regular" interests or "residual" interests. The Funds currently do
not intend to purchase residual interests in REMICs. The REMIC Certificates
represent beneficial ownership interests in a REMIC trust, generally consisting
of mortgage loans or Fannie Mae, Freddie Mac or Ginnie Mae guaranteed mortgage
pass-through certificates. The obligations of Fannie Mae or Freddie Mac under
their respective guaranty of the REMIC Certificates are obligations solely of
Fannie Mae or Freddie Mac, respectively.


- ------------------------------
Allmerica Investment Trust

                                       22
<PAGE>

Fannie Mae REMIC Certificates are issued and guaranteed as to timely
distribution of principal and interest by Fannie Mae. In addition, Fannie Mae
will be obligated to distribute the principal balance of each class of REMIC
Certificates in full, whether or not sufficient funds are available otherwise.

For Freddie Mac REMIC Certificates, Freddie Mac guarantees the timely payment of
interest and also guarantees the payment of principal as payments are required
to be made on the underlying mortgage participation certificates ("PCs"). PCs
represent undivided interests in specified residential mortgages or
participations therein purchased by Freddie Mac and placed in a PC pool. With
respect to principal payments on PCs, Freddie Mac generally guarantees ultimate
collection of all principal of the related mortgage loans without offset or
deduction. Freddie Mac also guarantees timely payment of principal on certain
PCs referred to as "Gold PCs."

Ginnie Mae REMIC Certificates guarantee the full and timely payment of interest
and principal on each class of securities (in accordance with the terms of those
classes). This Ginnie Mae guarantee is backed by the full faith and credit of
the United States.

REMIC Certificates issued by Fannie Mae, Freddie Mac and Ginnie Mae are treated
as U.S. government securities for purposes of investment policies. There can be
no assurance that the U.S. Government will continue to provide financial support
to Fannie Mae, Freddie Mac or Ginnie Mae in the future.

STRIPPED MORTGAGE-BACKED SECURITIES

The Select Income Fund, Select Investment Grade Income Fund and Government Bond
Fund may invest in stripped mortgage-backed securities ("SMBS"). SMBS are
derivative multiclass mortgage securities. SMBS may be issued by agencies or
instrumentalities of the U.S. Government or by private originators of, or
investors in, mortgage loans, including savings and loan associations, mortgage
banks, commercial banks, investment banks and special purpose entities of the
foregoing.

SMBS usually are structured with two classes that receive different proportions
of the interest and principal distributions on a pool of mortgage assets. One
type of SMBS will have one class receiving some of the interest and most of the
principal from the mortgage assets, while the other class will receive most of
the interest and the remainder of the principal. In some cases, one class will
receive all of the interest (the interest-only or "IO" class) while the other
class will receive all of the principal (the principal-only or "PO" class). The
yield to maturity on an IO class is extremely sensitive to the rate of principal
payments (including prepayment on the related underlying mortgage assets), and a
rapid rate of principal payments may have a material, adverse effect on a
portfolio yield to maturity from these securities. If the underlying mortgage
assets experience greater than anticipated prepayments of principal, the Funds
may fail to recoup fully their initial investment in these securities even if
the security is in one of the highest rating categories. Certain SMBS may be
deemed "illiquid" and subject to the Funds' limitations on investment in
illiquid securities. The market value of the PO class generally is unusually
volatile in response to changes in interest rates. The yields on a class of SMBS
that receives all or most of the interest from mortgage assets generally are
higher than prevailing market yields in other mortgage-backed securities because
their cash flow patterns are more volatile and there is a greater risk that the
initial investment will not be recouped fully. The Sub- Adviser will seek to
manage these risks (and potential benefits) by investing in a variety of such
securities and by using certain hedging techniques.


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       23
<PAGE>


INTEREST-ONLY AND PRINCIPAL-ONLY TREASURY SECURITIES

The Select Income Fund and Government Bond Fund may invest in separately-traded
principal and interest components of U.S. Treasury securities. Treasury
securities are high-quality securities issued or guaranteed by the U.S.
Government and backed by the full faith and credit of the U.S. Treasury.
Treasury securities include Treasury bills, notes and bonds, which may differ
only in their interest rates, maturities and times of issuance. The yield to
maturity on an interest-only Treasury security is extremely sensitive to the
rate of principal payments, and a rapid rate of principal payments may have a
material, adverse effect on the portfolio's yield to maturity from these
securities. The market value of principal-only Treasury securities is unusually
volatile in response to changes in interest rates.

MUNICIPAL SECURITIES

The Select Income Fund may invest in municipal bonds. Municipal securities are
debt obligations issued by or on behalf of states, cities, municipalities and
other public authorities. The two principal classifications of municipal
securities are "general obligation" securities and "revenue" securities. General
obligation securities are secured by the issuer's pledge of its full faith,
credit and taxing power for the payment of principal and interest. Revenue
securities are payable only from the revenues derived from a particular facility
or class of facilities or, in some cases, from the proceeds of a special excise
tax or other specific revenue source such as the user of a facility being
financed. Revenue securities may include private activity bonds. Such bonds may
be issued by or on behalf of public authorities to finance various privately
operated facilities and are not payable from the unrestricted revenues of the
issuer. As a result, the credit quality of private activity bonds is frequently
related directly to the credit standing of private corporations or other
entities. In addition, the interest on private activity bonds issued after
August 7, 1986 is subject to the federal alternative minimum tax.

Municipal securities can be significantly affected by political changes as well
as uncertainties in the municipal market related to taxation, legislative
changes, or the rights of municipal security holders. Because many municipal
securities are issued to finance similar projects, especially those relating to
education, health care, transportation and utilities, conditions in those
sectors can affect the overall municipal market. In addition, changes in the
financial condition of an individual municipal issuer can affect the overall
municipal market.

HEDGING TECHNIQUES AND INVESTMENT PRACTICES

The Select Emerging Markets Fund, Select Capital Appreciation Fund and Select
International Equity Fund may employ certain strategies in order to manage
exchange rate risks. For example, the Funds may hedge some or all of their
investments denominated in a foreign currency against a decline in the value of
that currency. The Funds may enter into contracts to sell that foreign currency
for U.S. dollars (not exceeding the value of a Fund's assets denominated in or
exposed to that currency) or by participating in options on futures contracts
with respect to such currency ("position hedge"). The Funds also could hedge
that position by selling a second currency that is expected to perform similarly
to the currency in which portfolio investments are denominated for U.S. dollars
("proxy hedge"). The Funds also may enter into a forward contract to sell the
currency in which the security is denominated for a second currency that is
expected to perform better relative to the U.S. dollar if their Sub-Adviser
believes there is a reasonable degree of correlation between movements in the
two currencies ("cross-hedge"). As an operational policy, the Funds will not
commit more than 10% of their assets to the consummation of cross-hedge
contracts and either will cover currency hedging transactions with liquid
portfolio securities denominated in or whose value is tied to the applicable
currency or segregate liquid assets in the amount of such commitments. In
addition, when the Funds anticipate repurchasing securities denominated in a
particular currency, the Funds may enter into a forward contract to purchase
such currency in exchange for the dollar or another currency ("anticipatory
hedge").

These strategies minimize the effect of currency appreciation as well as
depreciation, but do not protect against a decline in the underlying value of
the hedged security. In addition, such strategies may reduce or eliminate the
opportunity to profit from increases in the value of the original currency and
may have an adverse impact on a Fund's performance if its Sub-Adviser's
projection of future exchange rates is inaccurate.

STAND-BY COMMITMENTS

The Select Income Fund, Select Investment Grade Income Fund, Government Bond
Fund and Money Market Fund may enter into Stand-by Commitments. Under a stand-by
commitment, a dealer agrees to purchase from the Fund, at the Fund's option,
specified securities at a specified price. Stand-by commitments are exercisable
by the Fund at any time before the maturity of the underlying security, and may
be sold, transferred or assigned by the Fund only with respect to the underlying
instruments.

Although stand-by commitments are often available without the payment of any
direct or indirect consideration, if necessary or advisable, the Fund may pay
for a stand-by commitment either separately in cash or by paying a higher price
for securities which are acquired subject to the commitment.

Where the Fund pays any consideration directly or indirectly for a stand-by
commitment, its cost will be reflected as unrealized depreciation for the period
during which the commitment is held by the Fund.

The Fund will enter into stand-by commitments only with banks and broker-
dealers which present minimal credit risks. In evaluating the creditworthiness
of the issuer of a stand-by commitment, the Sub-Adviser will review periodically
the issuer's assets, liabilities, contingent claims and other relevant financial
information.

The Fund will acquire stand-by commitments solely to facilitate liquidity and
does not intend to exercise its rights thereunder for trading purposes. Stand-by
commitments will be valued at zero in determining the Fund's net asset value.

PORTFOLIO TURNOVER

The portfolio turnover rate for a Fund is calculated by dividing the lesser of
purchases or sales of portfolio securities by the Fund for a given year by the
monthly average of the value of the Fund's portfolios securities for that year.
The purchase or sale of all securities whose maturities or expiration dates at
the time of acquisition are less than 12 months and of money market funds of
amounts too small to invest in short-term obligations are not included in the
portfolio turnover rate.


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Allmerica Investment Trust

                                       24
<PAGE>

A higher portfolio turnover rate may involve corresponding greater brokerage
commissions and other transaction costs, which would be borne directly by the
Fund, as well as additional realized gains and/or losses to shareholders.
Following are explanations of any significant variations in the Funds' portfolio
turnover rates over the two most recently completed fiscal years or any
anticipated variation in the portfolio turnover rate.

<TABLE>
<CAPTION>
FUND                                                     DECEMBER 31, 1998      DECEMBER 31, 1999
- ----                                                     -----------------      -----------------
<S>                                                      <C>                    <C>
Select Emerging Markets Fund                                    62%**                   60%
Select Aggressive Growth Fund                                   99%                    101%
Select Capital Appreciation Fund*                              141%                     61%
Select Value Opportunity Fund                                   73%                     98%
Select International Equity Fund                                27%                     18%
Select Growth Fund                                              86%                     84%
Select Strategic Growth Fund                                    24%**                   58%
Core Equity Fund (formerly the Growth Fund)                    100%                    116%
Equity Index Fund                                                6%                     21%
Select Growth and Income Fund                                  112%                    131%
Select Income Fund                                             130%                    177%
Select Investment Grade Income Fund***                         158%                     75%
   (formerly the Investment Grade Income Fund)
Government Bond Fund                                            61%                     37%
Money Market Fund                                               N/A                     N/A
</TABLE>

*   The portfolio turnover rate was greater in fiscal year 1998 due to a change
in the Fund's Sub-Adviser.

**  Not annualized

*** The portfolio turnover rate was greater in fiscal year 1998 due to the
larger number of mortgage rolls held by the Fund during that period.

                             MANAGEMENT OF THE TRUST

The Trust is managed by a Board of Trustees. The Trustees have overall
responsibility for implementation of the investment policies and operations of
the Funds of the Trust. The Board of Trustees of the Trust holds regular
quarterly meetings and at other times on an as needed basis. The affairs of the
Trust are conducted in accordance with the Bylaws adopted by the Trustees and
the applicable laws of the Commonwealth of Massachusetts, the state in which the
Trust is organized.

<TABLE>
<CAPTION>
                              POSITIONS HELD          PRESENT POSITION AND PRINCIPAL
NAME, ADDRESS AND AGE       WITH THE TRUST/(1)/     OCCUPATIONS DURING THE PAST 5 YEARS
- ---------------------       -------------------     -----------------------------------
<S>                         <C>                     <C>
P. Kevin Condron (54)       Trustee                 President and Chief Executive Officer,
The Granite Group                                   The Granite Group (plumbing supplies), 1998
12 E. Worcester Street                              - present; President, Central Supply Co., 1983 -
Worcester, Massachusetts                            1997; Director, Peoples Heritage Financial Group;
                                                    Director, Family Bank

**Cynthia A. Hargadon (45)  Trustee                 Director of Investments, National Automobile
1880 Virginia Avenue                                Dealers Association (retirement trust), 1999 -
McLean, Virginia                                    present; President, Stable Value Investment Association
                                                    (investment trade group), 1996 - 1998; Senior
                                                    Vice President and Chief Investment Officer,
                                                    ICMA Retirement Corporation (investment adviser),
                                                    1987 - 1996

Gordon Holmes (62)(2)       Trustee                 Lecturer at Bentley College, 1998 - present;
75 Clarendon Street                                 Lecturer and Executive in Residence, Boston
Boston, Massachusetts                               University, 1997 - present; Certified Public
                                                    Accountant; Retired Partner, Tofias, Fleishman,
                                                    Shapiro & Co., P.C. (Accountants) 1976-1996

**John P. Kavanaugh (45)*   Trustee and             President, Allmerica Asset Management,
440 Lincoln Street          Vice President,         Inc. since 1995; Vice President, Director, Chief
Worcester, Massachusetts                            Investment Officer, First Allmerica and
                                                    Allmerica Financial Life Insurance and Annuity
                                                    Company ("Allmerica Financial Life")

**Bruce E. Langton (68)     Trustee                 Trustee, Bankers Trust institutional mutual funds;
99 Jordan Lane                                      Director, TWA Pilots Trust
Stamford, Connecticut                               Annuity Plan; Member, Investment Committee,
                                                    Unilever United States -Pension & Thrift plans
</TABLE>


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       25
<PAGE>

<TABLE>
<CAPTION>
                                      POSITIONS HELD                      PRESENT POSITION AND   PRINCIPAL
NAME, ADDRESS AND AGE               WITH THE TRUST/(1)/                 OCCUPATIONS DURING THE PAST 5 YEARS
- ---------------------               -------------------                 -----------------------------------
<S>                                 <C>                           <C>
John F. O'Brien (57)*               Trustee and                   President, Chief Executive Officer and Director,
First 440 Lincoln Street            Chairman of the Board,        Allmerica; Director and Chairman of the Board,
                                                                  Allmerica Financial Life; Director, Allmerica
                                                                  Investments, Inc.; Director, ABIOMED, Inc.
                                                                  (medical devices); Director, Cabot Corporation
                                                                  (special chemicals), Director, TJX Corporation,
                                                                  Inc. (retail)

Attiat F. Ott (64)                  Trustee                       Professor of Economics and Director of the
262 Salisbury Street                                              Institute for Economic Studies, Clark University
Worcester, Massachusetts

**Paul D. Paganucci (69)             Trustee                      Director and Chairman, Ledyard National Bank,
33 Rope Ferry Road                                                since 1991;  Director, Filene's Basement, Inc. (retailing);
Hanover, New Hampshire                                            Director, Urstadt Biddle Properties, Inc. (real estate
                                                                  investment firm); Director, IGI, Inc.
                                                                  (pharmaceuticals).

**Richard M. Reilly (61)*           Trustee                       President, Allmerica Financial Life since
440 Lincoln Street                  and President                 1995; Vice President, First Allmerica; President,
Worcester, Massachusetts                                          AFIMS; Director, Allmerica Investments, Inc.

**Ranne P. Warner (55)              Trustee                       President, Centros Properties, USA (real estate);
Centros Properties USA, Inc.                                      Owner, Ranne P. Warner and Company;
176 Federal Street, 6/th/ Floor                                   Director, Wainwright Bank & Trust Co.
Boston, Massachusetts 02110                                       (commercial bank); Trustee, Ericksen Trust
                                                                  (real estate)

Paul T. Kane (42)(2)                 Assistant Vice President     Assistant Vice President, First Allmerica
440 Lincoln Street                   and Treasurer                since June 1999; Vice President/Treasurer
Worcester, Massachusetts             (Principal Accounting        of Tax & Financial Services, BISYS Fund
                                       Officer)                   Services, 1997-1999; Director of Shareholder
                                                                  Reporting, Fidelity Investments, 1992-1997

George Boyd (55)(2)                 Secretary                     Counsel, First Allmerica since January 1997;
440 Lincoln Street                                                Director, Mutual Fund Administration - Legal
Worcester, Massachusetts                                          and Regulatory, Investors Bank & Trust Company,
                                                                  1995 - 1996; Vice President and Counsel, 440
                                                                  Financial Group and First Data Investor Services
                                                                  Group, 1992 - 1995.
</TABLE>


(1) The individuals listed hold the same position with Allmerica Securities
Trust, a closed-end management investment company which is a part of the Trust
complex that includes the Trust.

(2) The individuals listed hold the same position with The Fulcrum Trust, an
open-end management investment company which is part of the Trust complex that
includes the Trust.

*    Indicates the Trustees who are "interested persons" of the Trust as defined
     in the 1940 Act.

**   Indicates members of the Trust's Investment Operations Committee, which
     reviews the performance of each Fund and recommends to the Board of
     Trustees the selection and retention of Sub-Advisers.

     The Trustees who are not directors, officers, or employees of the Trust or
any investment adviser are reimbursed for their travel expenses in attending
meetings of the Trust.

     Listed below is the compensation paid to each Trustee by the Trust and by
all funds in the Trust complex for the fiscal year ended December 31, 1999. The
Fund currently does not provide any pension or retirement benefits for its
Trustees or officers.


                                                  ------------------------------
                                                  Allmerica Investment Trust

                                       26
<PAGE>

<TABLE>
<CAPTION>


                               COMPENSATION TABLE

                                         AGGREGATE           TOTAL COMPENSATION
                                       COMPENSATION          FROM TRUST COMPLEX
*NAME OF PERSON AND POSITION            FROM TRUST           PAID TO TRUSTEES*
- ----------------------------            ----------           -----------------
<S>                                    <C>                   <C>

P. Kevin Condron                       $16,920                  $19,000
Cynthia Hargadon                       $19,420                  $21,500
Gordon Holmes                          $19,920                  $29,500
Bruce E. Langton                       $22,420                  $24,500
Attiat F. Ott                          $19,920                  $22,000
Paul D. Paganucci**                    $11,500                  $11,500
Ranne P. Warner                        $23,420                  $25,500
John P. Kavanaugh                            0                        0
John F. O'Brien                              0                        0
Richard M. Reilly                            0                        0

</TABLE>

       *    Includes two other investment companies.

      **    Mr. Paganucci was appointed Trustee as of March 11, 2000.



The Trust, AFIMS, the Sub-Advisers and the Distributor, Allmerica Investments,
Inc. ("AII"), have adopted codes of ethics under Rule 17j-1 of the 1940 Act
which permit personnel subject to such codes to invest in securities, including
securities that may be purchased or held by the Funds of the Trust.

               CONTROL PERSON AND PRINCIPAL HOLDERS OF SECURITIES

The Trust was established as a Massachusetts business trust under the laws of
Massachusetts by an Agreement and Declaration of Trust dated October 11, 1984
(the "Trust Declaration"). AFIMS is the Manager of the Trust. The shares of each
of the Funds of the Trust currently are purchased only by Separate Accounts
established by First Allmerica or Allmerica Financial Life for the purpose of
funding variable annuity contracts and variable life insurance policies. The
Trust has obtained an exemptive order from the Securities and Exchange
Commission to permit Fund shares to be sold to variable annuity and variable
life insurance separate accounts of both affiliated and unaffiliated life
insurance companies and certain qualified pension and retirement plans. The
Separate Accounts of First Allmerica or its affiliates are the shareholders of
the Trust. As of February 15, 2000, Allmerica Financial Life, owned both of
record and beneficially in excess of 47% of the shares of the Select Emerging
Markets Fund and in excess of 17% of the shares of the Select Strategic Growth
Fund. A shareholder that owns more than 25% of the shares of a Fund is deemed to
be a controlling person of such Fund. As of February 15, 2000, the Trustees and
officers of the Trust, as a group, owned less than 1% of the outstanding shares
of any Fund. AFIMS, First Allmerica and Allmerica Financial Life are direct or
indirect wholly-owned subsidiaries of Allmerica Financial Corporation ("AFC"), a
publicly-traded Delaware holding company for a group of affiliated companies,
the largest of which is First Allmerica. The address of AFIMS, First Allmerica,
Allmerica Financial Life and AFC is 440 Lincoln Street, Worcester, MA 01653.
AFIMS and First Allmerica were organized in Massachusetts and Allmerica
Financial Life was organized in Delaware. AFIMS also serves as investment
manager of The Fulcrum Trust, another open-end investment management company.

                    INVESTMENT MANAGEMENT AND OTHER SERVICES

The overall responsibility for the supervision of the affairs of the Trust vests
in the Board of Trustees of the Trust which meets on a quarterly basis. AFIMS
serves as investment manager of the Trust pursuant to a management agreement
between the Trust and the Manager (the "Management Agreement"). The Manager is
responsible for the management of the Trust's day-to-day business affairs and
has general responsibility for the management of the investments of the Funds.
The Manager has entered into sub-adviser agreements with different investment
advisory firms (the "Sub-Advisers") to manage each of the Funds, at its expense,
subject to the requirements of the 1940 Act, as amended. Each Sub- Adviser,
which has been selected on the basis of various factors including management
experience, investment techniques, and staffing, is authorized to engage in
portfolio transactions on behalf of the applicable Fund subject to such general
or specific instructions as may be given by the Trustees and/or the Manager.


                                                   -----------------------------
                                                   Allmerica Investment Trust

                                       27
<PAGE>

The Sub-Advisers have been selected by the Manager and Trustees in consultation
with BARRA RogersCasey, Inc. ("BARRA RogersCasey"), a pension consulting firm.
BARRA RogersCasey is wholly controlled by BARRA, Inc. The cost of such
consultation is borne by the Manager.

BARRA RogersCasey provides consulting services to pension plans representing
hundreds of billions of dollars in total assets and, in its consulting capacity,
monitors the investment performance of over 1,000 investment advisers. As a
consultant, BARRA RogersCasey has no decision-making authority with respect to
the Funds, and is not responsible for advice provided by the Manager or the Sub-
Advisers. From time to time, specific clients of BARRA RogersCasey and the Sub-
Advisers will be named in sales materials.

The following is information relating to control and affiliations of the Manager
and certain Sub-Advisers of the Trust.

AFIMS, First Allmerica and Allmerica Financial Life are direct or indirect
wholly-owned subsidiaries of Allmerica Financial Corporation ("AFC"), a
publicly-traded Delaware holding company for a group of affiliated companies,
the largest of which is First Allmerica. First Allmerica and Allmerica Financial
Life have established Separate Accounts for the purpose of funding variable
annuity contracts and variable life insurance policies. The shares of each of
the Funds of the Trust may be purchased only through these Separate Accounts.


Schroder Investment Management North America Inc. ("Schroder"), Sub-Adviser to
the Select Emerging Markets Fund, is a wholly-owned U.S. subsidiary of Schroders
U.S. Holdings, Inc., the indirect wholly-owned U.S. subsidiary of Schroders plc,
a publicly owned holding company organized under the laws of England. As of June
30, 1999, Schroders plc and its affiliates had assets under management of
approximately $208 billion.

Nicholas-Applegate Capital Management, L.P. ("NACM") was founded in 1984 and
serves as Sub-Adviser to the Select Aggressive Growth Fund. NACM currently
manages over $40 billion of discretionary assets for numerous clients, including
employee benefit plans of corporations, public retirement systems and unions,
university endowments, foundations and other institutional investors and
individuals. NACM's principal business address is 600 West Broadway, San Diego,
California 92101.

T. Rowe Price Associates, Inc. ("T. Rowe Price") serves as Sub-Adviser to the
Select Capital Appreciation Fund. T. Rowe Price International Series, Inc., an
investment company managed by a T. Rowe Price affiliate, is currently used as an
investment vehicle for certain insurance products sponsored by First Allmerica
and Allmerica Financial Life.

Cramer Rosenthal McGlynn, LLC ("CRM"), Sub-Adviser to the Select Value
Opportunity Fund, is owned by its active investment professionals, Cramer
Rosenthal McGlynn, Inc., ("Cramer Rosenthal") and WT Investments, Inc. ("WTI")
an indirect, wholly-owned subsidiary of Wilmington Trust Corporation ("WTC").
Founded in 1973, Cramer Rosenthal provides investment advice to individuals,
state and local government agencies, pension and profit sharing plans, trusts,
estates, endowments and other organizations. WTC is a bank and holding company
and has operations in Delaware, Pennsylvania, Florida, Maryland and New York.
Through its subsidiaries, WTC engages in residential, commercial and
construction lending, deposit taking, insurance, travel, investment advisory and
broker-dealer services and mutual fund administration. As of December 31, 1999,
WTC, together with its subsidiaries, had $7.2 billion in assets. Wilmington
Trust Company, the largest subsidiary of WTC, is among the nation's largest
personal trust companies and holds approximately $137 billion in fiduciary
capacity. As of December 31, 1999, WTI owned a 26.14% fully diluted interest in
CRM.

Bank of Ireland Asset Management (U.S.) Limited ("BIAM"), Sub-Adviser to the
Select International Equity Fund, is a wholly-owned subsidiary of Bank of
Ireland. Bank of Ireland provides investment management services through a
network of affiliated companies, including BIAM which represents North American
clients.

Putnam Investment Management, Inc., ("Putnam") Sub-Adviser to the Select Growth
Fund, is a wholly-owned subsidiary of Putnam Investments, Inc., a holding
company which, other than a minority interest owned by employees, is in turn
wholly-owned by Marsh & McLennan Companies, Inc., a publicly-owned holding
company whose principal businesses are international insurance and reinsurance
brokerage, employee benefit consulting and investment management.


- -----------------------------
Allmerica Investment Trust

                                       28
<PAGE>


TCW Investment Management Company ("TCW"), Sub-Adviser to the Select Strategic
Growth Fund, is a wholly-owned subsidiary of The TCW Group, Inc., a Nevada
corporation ("TCW Group"). TCW is a registered investment adviser with the
Securities and Exchange Commission under the Investment Advisers Act of 1940, as
amended. TCW's affiliates include other registered investment advisers and an
independent trust company chartered by the State of California (collectively,
"TCW Affiliates"). Ownership of TCW Group lies approximately 95% with employees
and 5% with directors. TCW Affiliates primary business is the provision of
investment management services. TCW Affiliates specialize in the management of
taxable and tax-exempt pools of capital for pension and profit sharing funds,
retirement/health and welfare funds, public employee retirement funds, financial
institutions, endowments and foundations as well as foreign investors. Through
TCW Affiliates' Private Client Services Group, customized investment management
services are provided to high net worth individuals and family offices. In
addition, TCW Affiliates manages a full line of no load mutual funds under the
brand name TCW Galileo Funds.

Miller Anderson & Sherrerd, LLP ("MAS"), Sub-Adviser to the Core Equity Fund
(formerly the Growth Fund), is wholly-owned by indirect subsidiaries of Morgan
Stanley Dean Witter & Co. ("MSDW"), and is a division of Morgan Stanley Dean
Witter Investment Management. MAS is the adviser of the MAS Funds, a registered
investment company offering investment alternatives to institutional clients
with a minimum initial investment of $1 million. MAS also manages certain assets
for First Allmerica and its affiliates. MSDW is a preeminent global financial
services firm that maintains leading market positions in each of its three
primary businesses - securities, asset management and credit services.

AAM serves as Sub-Adviser to the Equity Index Fund as well as the Select
Investment Grade Income Fund (formerly the Investment Grade Income Fund),
Government Bond Fund and Money Market Fund, other series of the Trust. AAM is a
direct, wholly-owned subsidiary of AFC. AAM serves as investment adviser to
First Allmerica's General Account and to a number of affiliated insurance
companies and other affiliated accounts, and as Adviser to Allmerica Securities
Trust, a diversified, closed-end management investment company. AFC is a
publicly-traded Delaware holding company for a group of affiliated companies.

J.P. Morgan Investment Management Inc. ("J.P. Morgan"), Sub-Adviser to the
Select Growth and Income Fund, is a wholly-owned asset management subsidiary of
J.P. Morgan & Co. Incorporated, which was founded in 1861, and serves as an
investment adviser for employee benefit plans and other institutional assets, as
well as mutual funds and variable annuities. J.P. Morgan & Co. Incorporated is a
bank holding company and a global financial services firm, providing specialized
advice and services for governments, businesses and individuals.

Standish, Ayer & Wood, Inc. ("SAW"), Sub-Adviser to the Select Income Fund, also
serves as investment adviser to an institutional account sponsored by an AFC
affiliate. Through its affiliate, Standish International Investment Management
Company, L.P. SAW offers international investment services. SAW is an
independent investment counseling firm owned by its twenty-five directors who
are active with the firm.

The following is a list of persons who are affiliated persons of the Trust and
affiliated persons of the Manager and/or any Sub-Adviser and the capacities in
which the person is affiliated.

<TABLE>
<CAPTION>


                              POSITION(S) HELD                            POSITION(S) HELD WITH THE MANAGER
    NAME                      WITH THE TRUST                                 OR SUB-ADVISER OF THE TRUST
    ----                      --------------                                 ---------------------------
<S>                          <C>                                         <C>

Stephen W. Bright            Vice President                              Vice President, AAM; Vice President,
                                                                         AFIMS

Ann K. Tripp                 Vice President                              Vice President, AAM

Paul T. Kane                 Assistant Vice President and Treasurer      Assistant Vice President, AFIMS
                             (Principal Accounting Officer)

John C. Donohue              Vice President                              Vice President, AAM

John P. Kavanaugh            Vice President                              President, AAM; Vice President,
                                                                         AFIMS

Richard J. Litchfield        Vice President                              Vice President, AAM

John F. O'Brien              Chairman of the Board                       Chairman and Director, AFIMS;
                                                                         Director, AAM

Richard M. Reilly            President                                   Director and President, AFIMS
</TABLE>


                                                   -----------------------------
                                                   Allmerica Investment Trust

                                       29
<PAGE>

First Allmerica, Allmerica Financial Life, AFIMS and AAM are direct or indirect,
wholly-owned subsidiaries of AFC. The Trust serves as an investment vehicle for
the Separate Accounts established by First Allmerica and Allmerica Financial
Life.

Under its Management Agreement with the Trust, the Manager is obligated to
perform certain administrative and management services for the Trust; furnishes
to the Trust all necessary office space, facilities, and equipment; and pays the
compensation, if any, of officers and Trustees who are affiliated with the
Manager. Other than the expenses specifically assumed by the Manager under the
Management Agreement, all expenses incurred in the operation of the Trust are
borne by the Trust, including fees and expenses associated with the registration
and qualification of the Trust's shares under the Securities Act of 1933 (the
"1933 Act"); other fees payable to the SEC; independent accountant, legal and
custodian fees; association membership dues; taxes; interest; insurance
premiums; brokerage commissions; fees and expenses of the Trustees who are not
affiliated with the Manager; expenses for proxies, prospectuses and reports to
shareholders; Fund recordkeeping expenses and other expenses.

For the services provided to the Funds, the Manager receives fees computed daily
at an annual rate based on the average daily net asset value of each Fund as set
forth below.

<TABLE>
<CAPTION>

                      SELECT            SELECT        SELECT CAPITAL       SELECT VALUE           SELECT            SELECT
                     EMERGING         AGGRESSIVE       APPRECIATION        OPPORTUNITY         INTERNATIONAL        GROWTH
                   MARKETS FUND      GROWTH FUND           FUND                FUND            EQUITY FUND           FUND
                   ------------      -----------           ----                ----            -----------           ----
<S>                <C>                  <C>                <C>                 <C>                 <C>               <C>
Manager Fee           1.35%*             (1)               (1)                 (2)                 (1)               (2)

<CAPTION>
                   SELECT                                                                        SELECT
                  STRATEGIC          CORE           EQUITY      SELECT GROWTH     SELECT       INVESTMENT
                   GROWTH           EQUITY          INDEX        AND INCOME       INCOME          GRADE
                     FUND            FUND            FUND           FUND            FUND       INCOME FUND
                     ----            ----            ----           ----            ----       -----------
<S>               <C>               <C>             <C>         <C>               <C>          <C>
Manager Fee         0.85%           (1)              (3)            (1)            (4)             (4)

<CAPTION>

                         GOVERNMENT             MONEY
                            BOND               MARKET
                            FUND                FUND
                            ----                ----
<S>                       <C>                  <C>

Manager Fee                 0.50%               (3)

</TABLE>

*The Manager voluntarily has agreed until further notice to waive its management
fee in the event that expenses of the Select Emerging Markets Fund exceed 2.00%
of the Fund's average daily net assets. The amount of such waiver will be
limited to the net amount of management fees earned by the Manager from the Fund
after subtracting the fees paid by the Manager to Schroder for sub-advisory
services.

       (1) The Manager's fees for the Select Aggressive Growth Fund, Select
       Capital Appreciation Fund, Select International Equity Fund, Core Equity
       Fund (formerly the Growth Fund) and Select Growth and Income Fund,
       computed daily at an annual rate based on the average daily net assets of
       each Fund, are based on the following schedule:

<TABLE>
<CAPTION>



                                                                    SELECT                       SELECT GROWTH
                     SELECT AGGRESSIVE      SELECT CAPITAL      INTERNATIONAL       CORE           AND INCOME
ASSETS                  GROWTH FUND       APPRECIATION FUND      EQUITY FUND      EQUITY FUND         FUND
- ------                  -----------       -----------------      -----------      -----------         ----
<S>                  <C>                  <C>                   <C>               <C>           <C>
First $100 Million..       1.00%                 1.00%              1.00%            0.60%            0.75%
Next $150 Million...       0.90%                 0.90%              0.90%            0.60%            0.70%
Next $250 Million...       0.80%                 0.80%              0.85%            0.40%            0.65%
Over $500 Million...       0.70%                 0.70%              0.85%            0.35%            0.65%
Over $1 Billion            0.65%                 0.65%              0.85%            0.35%            0.65%
</TABLE>

                                       30
<PAGE>

(2) The Manager's fees for the Select Value Opportunity Fund and Select Growth
Fund, computed daily at an annual rate based on the average daily net assets of
each Fund, are based on the following schedule:

                                                SELECT VALUE
                                                 OPPORTUNITY      SELECT GROWTH
           ASSETS                                   FUND              FUND
           ------                                   ----              ----

           First $100 Million................       1.00%            0.85%
           Next $150 Million.................       0.85%            0.85%
           Next $250 Million.................       0.80%            0.80%
           Next $250 Million.................       0.75%            0.75%
           Over $750 Million.................       0.70%            0.70%


     The Manager voluntarily has agreed to limit its management fees to an
     annual rate of 0.90% of average daily net assets of the Select Value
     Opportunity Fund until further notice.

     (3) The Manager's fees for the Equity Index Fund and Money Market Fund,
     computed daily at an annual rate based on the average daily net assets of
     each Fund, are based on the following schedule:

                                                   EQUITY            MONEY
                                                    INDEX           MARKET
           ASSETS                                   FUND             FUND
           ------                                   ----             ----

           First $50 Million.................       0.35%            0.35%
           Next $200 Million.................       0.30%            0.25%
           Over $250 Million.................       0.25%            0.20%


(4) The Manager's fees for the Select Income Fund and Select Investment Grade
Income Fund (formerly the Investment Grade Income Fund), computed daily at an
annual rate based on the average daily net assets of each Fund, are based on the
following schedule:

                                                                    SELECT
                                                   SELECT         INVESTMENT
                                                   INCOME            GRADE
           ASSETS                                   FUND          INCOME FUND
           ------                                   ----          -----------

           First $50 Million.................       0.60%            0.50%
           Next $50 Million..................       0.55%            0.45%
           Over $100 Million.................       0.45%            0.40%

The Manager is responsible for the payment of all fees to the Sub-Advisers. The
Manager pays each Sub-Adviser fees computed daily at an annual rate based on the
average daily net asset value of each Fund as set forth below. In certain Funds,
Sub-Adviser fees vary according to the level of assets in such Funds, which will
reduce the fees paid by the Manager as Fund assets grow but will not reduce the
operating expenses of such Funds.

<TABLE>
<CAPTION>

                          SELECT           SELECT       SELECT CAPITAL       SELECT VALUE          SELECT           SELECT
                         EMERGING        AGGRESSIVE      APPRECIATION        OPPORTUNITY        INTERNATIONAL       GROWTH
                       MARKETS FUND     GROWTH FUND           FUND               FUND            EQUITY FUND         FUND
                       ------------     -----------           ----               ----            -----------         ----
<S>                    <C>              <C>             <C>                  <C>              <C>
Sub-Adviser Fee            (5)             (6)                0.50%               (7)               (8)               (9)
<CAPTION>

                         SELECT                                                                  SELECT
                        STRATEGIC       CORE        EQUITY       SELECT GROWTH     SELECT      INVESTMENT
                         GROWTH        EQUITY        INDEX         AND INCOME      INCOME     GRADE INCOME
                          FUND          FUND         FUND             FUND          FUND          FUND
                          ----          ----         ----             ----          ----          ----
<S>                     <C>            <C>          <C>          <C>               <C>       <C>
Sub-Adviser Fee           (10)         (11)         0.10%            (12)          0.20%          0.20%
</TABLE>


                                                   -----------------------------
                                                   Allmerica Investment Trust

                                       31
<PAGE>

                                  GOVERNMENT                   MONEY
                                     BOND                     MARKET
                                     FUND                      FUND
                                     ----                      ----

Sub-Adviser Fee                      0.20%                    0.10%


(5) For its services, Schroder will receive a fee computed daily at an annual
rate based on the average daily net assets of the Select Emerging Markets Fund,
under the following schedule:

         ASSETS                                                          RATE
         ------                                                          ----

         First $50 Million.....................................          1.00%
         Next $50 Million......................................          0.85%
         Next $150 Million.....................................          0.75%
         Over $250 Million.....................................          0.60%


(6) For its services, NACM will receive a fee computed daily at an annual rate
based on the average daily net assets of the Select Aggressive Growth Fund,
under the following schedule:

         ASSETS                                                          RATE
         ------                                                          ----

         First $100 Million..........................................    0.60%
         Next $150 Million...........................................    0.50%
         Next $250 Million...........................................    0.40%
         Next $250 Million...........................................    0.375%
         Over $750 Million...........................................    0.35%


(7) For its services, CRM will receive a fee computed daily at an annual rate
based on the average daily net assets of the Select Value Opportunity Fund,
under the following schedule:

         ASSETS                                                          RATE
         ------                                                          ----

         First $100 Million........................................      0.60%
         Next $150 Million.........................................      0.50%
         Next $250 Million.........................................      0.40%
         Next $250 Million.........................................     0.375%
         Over $750 Million.........................................      0.35%


(8) For its services, BIAM will receive a fee computed daily at an annual rate
based on the average daily net assets of the Select International Equity Fund,
under the following schedule:

         ASSETS                                                          RATE
         ------                                                          ----

         First $50 Million............................................   0.45%
         Next $50 Million.............................................   0.40%
         Over $100 Million............................................   0.30%


(9) For its services, Putnam will receive a fee computed daily at an annual rate
based on the average daily net assets of the Select Growth Fund under the
following schedule:

         ASSETS                                                            RATE
         ------                                                            ----

         First $50 Million..............................................   0.50%
         Next $100 Million..............................................   0.45%
         Next $100 Million..............................................   0.35%
         Next $100 Million..............................................   0.30%
         Over $350 Million..............................................   0.25%

Allmerica Investment Trust                                        32
<PAGE>


(10) For its services, TCW will receive a fee computed daily and paid quarterly
at an annual rate of 0.85% based on the average daily net assets of the Select
Strategic Growth Fund of up to $100 million. When the average daily net assets
of the Fund exceed $100 million, the fee shall be computed daily and paid
quarterly at an annual rate of 0.75% of the total average daily net assets of
the Fund.

(11) MAS will receive a fee based on the aggregate assets of the Core Equity
Fund and certain other accounts of the Manager and its affiliates which are
managed by MAS, under the following schedule:

         ASSETS                                                           RATE
         ------                                                           ----

         First $50 Million...........................................     0.50%
         Next $50 Million............................................     0.375%
         Next $400 Million...........................................     0.25%
         Next $350 Million...........................................     0.20%
         Over $850 Million...........................................     0.15%


(12) For its services, J.P. Morgan will receive a fee computed daily at an
annual rate based on the average daily net assets of the Select Growth and
Income Fund, under the following schedule:

         ASSETS                                                           RATE
         ------                                                           ----

         First $500 Million..........................................     0.30%
         Next $500 Million...........................................     0.25%
         Over $1 Billion.............................................     0.20%


The total gross fees (before reimbursement) paid to the Manager under the
Management Agreement for each of the last three fiscal years ended December 31,
1999 were as follows:

<TABLE>
<CAPTION>
                                                   FISCAL YEAR 1999        FISCAL YEAR 1998      FISCAL YEAR 1997
                                                   ----------------        ----------------      ----------------
<S>                                                  <C>                          <C>                 <C>
  Select Emerging Markets Fund*                        $427,873                  $225,711                 N/A
  Select Aggressive Growth Fund                      $6,803,973                $5,977,909          $4,850,649
  Select Capital Appreciation Fund                   $3,061,620                $2,417,031          $1,813,444
  Select Value Opportunity Fund                      $2,531,026                $2,138,839          $1,433,016
  Select International Equity Fund                   $4,936,001                $4,117,316          $3,258,876
  Select Growth Fund                                 $7,471,700                $5,112,118          $2,959,723
  Select Strategic Growth Fund*                        $185,532                   $68,645                 N/A
  Core Equity Fund (formerly the Growth Fund)        $4,047,919                $3,519,665          $2,840,683
  Equity Index Fund                                  $1,531,338                $1,087,069            $705,708
  Select Growth and Income Fund                      $4,909,248                $3,790,917          $2,807,177
  Select Income Fund                                   $900,831                  $721,336            $524,021
  Select Investment Grade Income Fund                $1,059,711                  $933,311            $710,821
     (formerly the Investment Grade Income Fund)
  Government Bond Fund                                 $478,327                  $338,796            $244,355
  Money Market Fund                                  $1,019,642                  $731,259            $647,964
</TABLE>


* The Select Emerging Markets Fund and Select Strategic Growth Fund began
operations on February 20, 1998.

The total gross fees paid to each Sub-Adviser under the respective Sub-Adviser
Agreement for each of the last three fiscal years ended December 31, 1999 were
as follows:


<TABLE>
<CAPTION>

                                                                                    PAYMENTS MADE AS OF DECEMBER 31,
                                                                                    --------------------------------

FUND/SUB-ADVISER                                                  FISCAL YEAR 1999          FISCAL YEAR 1998       FISCAL YEAR 1997
- ----------------                                                  ----------------          ----------------       ----------------
<S>                                                                    <C>                        <C>                 <C>
Select Emerging Markets Fund*
  Schroder Investment Management North America Inc.                      $317,359                   $167,193             N/A
  ("Schroder")

Select Aggressive Growth Fund
  Nicholas-Applegate Capital Management, L.P.                          $3,819,739                 $3,470,632          $2,885,239

Select Capital Appreciation Fund**
  T. Rowe Price Associates, Inc. ("T. Rowe")                           $1,537,991                 $1,332,970          $1,070,021
</TABLE>


                                                     --------------------------
                                     33              Allmerica Investment Trust
<PAGE>

<TABLE>
<CAPTION>

                                                                                    PAYMENTS MADE AS OF DECEMBER 31,
                                                                                    --------------------------------

FUND/SUB-ADVISER                                                  FISCAL YEAR 1999          FISCAL YEAR 1998       FISCAL YEAR 1997
- ----------------                                                  ----------------          ----------------       ----------------
<S>                                                                  <C>                         <C>                    <C>
Select Value Opportunity Fund
  Cramer Rosenthal McGlynn, LLC ("CRM")                              $1,478,541                  $1,269,130             $851,815

Select International Equity Fund
  Bank of Ireland Asset Management (U.S.) Limited                    $1,640,792                  $1,498,759           $1,137,825

Select Growth Fund
  Putnam Investment Management, Inc. ("Putnam")                      $2,641,438                  $2,030,082           $1,328,717

Select Strategic Growth Fund*
  Cambiar Investors, Inc. ("Cambiar")                                  $109,343                     $40,380                  N/A

Core Equity Fund (formerly the Growth Fund)
  Miller Anderson & Sherrerd ("MAS")***                              $1,973,870                  $2,979,910           $2,669,867

Select Growth and Income Fund
  J.P. Morgan Investment Management Inc. ("J.P. Morgan")****         $1,895,701                  $1,668,885           $1,159,260

Select Income Fund
  Standish, Ayer & Wood Inc.                                           $344,798                    $265,038             $177,505

Allmerica Asset Management, Inc.
  Equity Index Fund, Select Investment Grade Income
  Fund (formerly the Investment Grade Income Fund),
  Government Bond Fund and Money Market Fund                         $1,560,580                  $1,218,085             $911,548
</TABLE>


*    The Select Emerging Markets Fund and Select Strategic Growth Fund began
     operations on February 20, 1998. Cambiar was replaced by TCW as Sub-Adviser
     of the Select Strategic Growth Fund on April 1, 2000.

**   The Select Capital Appreciation Fund began business operations on April 28,
     1995. Janus Capital Corporation ("JCC") was replaced by T. Rowe as
     Sub-Adviser for the Select Capital Appreciation Fund on April 1, 1998. The
     total dollar amount paid to JCC for the period January 1, 1998 through
     March 31, 1998 was $345,171. The total dollar amount paid to T. Rowe for
     the period April 1, 1998 through December 31, 1998 was $987,799.



***  Effective May 1, 2000, the name of the Growth Fund was changed to the Core
     Equity Fund. Includes payments to MAS for advisory services provided to
     certain other accounts of First Allmerica.

**** John A. Levin & Co., Inc. was replaced by J.P. Morgan as Sub-Adviser of the
     Select Growth and Income Fund on April 1, 1999.


The following table shows voluntary expense limitations which the Manager has
declared for each Fund and the operating expenses incurred for the fiscal year
ended December 31, 1999 for each Fund:



- ----------------------------
Allmerica Investment Trust                     34
<PAGE>

<TABLE>
<CAPTION>
                                                               PERCENTAGE OF AVERAGE DAILY ASSETS
                                                               ----------------------------------

                                                           VOLUNTARY EXPENSE            OPERATING
   FUND                                                       LIMITATIONS                EXPENSES+
   ----                                                       -----------                ---------
<S>                                                           <C>                        <C>
   Select Emerging Markets Fund                                     *                      1.88%
   Select Aggressive Growth Fund                                 1.35%                     0.88%
   Select Capital Appreciation Fund                              1.35%                     0.98%
   Select Value Opportunity Fund                                 1.25%                     0.88%
   Select International Equity Fund                              1.50%                     1.01%
   Select Growth Fund                                            1.20%                     0.81%
   Select Strategic Growth Fund                                  1.20%                     1.17%
   Core Equity Fund (formerly the Growth Fund)                   1.20%                     0.45%
   Equity Index Fund                                             0.60%                     0.35%
   Select Growth and Income Fund                                 1.10%                     0.73%
   Select Income Fund                                            1.00%                     0.61%
   Select Investment Grade Income Fund                           1.00%                     0.50%
      (formerly the Investment Grade Income Fund)
   Government Bond Fund                                          1.00%                     0.62%
   Money Market Fund                                             0.60%                     0.29%
</TABLE>


+Including reductions such as directed brokerage credits. See "Brokerage
Allocation - Directed Brokerage Program" in the SAI.



*   The Manager has agreed until further notice to waive voluntarily its
management fee in the event that expenses of the Select Emerging Markets Fund
exceed 2.00% of the Fund's average daily net assets. The amount of such waiver
will be limited to the net amount of management fees earned by the Manager from
the Fund after subtracting fees paid by the Manager to Schroder for sub-advisory
services.

The Manager will voluntarily reimburse its fees and any expenses above the
expense limitations. The expense limitations are voluntary and may be removed at
any time after a Fund's first fiscal year of operations with notice to existing
shareholders. The Manager reserves the right to recover from a Fund any fees,
within a current fiscal year period, which were reimbursed in that same year to
the extent that total annual expenses did not exceed the applicable expense
limitation. The expenses which are subject to the voluntary expense limitations
include management fees, independent accountant, legal and custodian fees;
recordkeeping expenses; fees and expenses of Trustees who are not affiliated
with the Manager; association membership dues, insurance; expenses for proxies,
prospectuses and reports to shareholders and fees associated with the
registration of Fund shares. Non-recurring and extraordinary expenses generally
are excluded in the determination of expense ratios of the Funds for purposes of
determining any applicable expense waiver or reimbursement. Quotations of yield
or total return for any period when an expense limitation is in effect will be
greater than if the limitation had not been in effect.

Each of the Management Agreement and sub-advisory agreements provides that it
may be terminated as to any Fund at any time by a vote of a majority in interest
of the shareholders of such Fund, by the Trustees or by the investment adviser
to such Fund without payment of any penalty on not more than 60 days' written
notice; provided, however, that the agreement will terminate automatically in
the event of its assignment. Each of the agreements will continue in effect as
to any Fund for a period of no more than two years from the date of its executor
only so long as such continuance is approved specifically at least annually by
the Trustees or by vote of a majority in interest of the shareholders of such
Fund. In either event, such continuance also must be approved by vote of a
majority of the Trustees who are not parties to the agreement or interested
persons of the Trust, the Manager or any sub-adviser, cast in person at a
meeting called for the purpose of voting such approval. The Trust and Manager
have obtained an order of exemption from the SEC that would permit the Manager
to enter into and materially amend sub-advisory agreements with non-affiliated
Sub-Advisers without obtaining shareholder approval. Under such agreements, any
liability of either the Manager or a sub-adviser is limited to situations
involving its willful misfeasance, bad faith, gross negligence or reckless
disregard of its obligations and duties.


                                                     ---------------------------
                                       35            Allmerica Investment Trust
<PAGE>

As printed in Nelson's Directory of Plan Sponsors - 1998, following is a listing
of Schroder's current representative clients in emerging markets investments:


  - Georgia-Pacific                         - New York City Retirement Systems
  - Idaho P.E.R.S.                          - NYS Teachers' Retirement Systems
  - Intermountain Health Care               - Orange County Retirement System
  - ISPAT Inland Inc.                       - Utah State Retirement System
  - L.A. City Employees Retirement          - Virginia Retirement Systems
  - Louisiana State E.R.S.                  - Washington State Investment Board
  - Merck & Co.


A listing of NACM's current representative clients is as follows:

  - Champion International Corp.            - San Francisco City and County
  - Johnson & Johnson                       - Unisys Corporation
  - Motion Picture Industry Pension Plan    - United Parcel Services of America
  - Screen Actors Guild                     - University of Notre Dame
                                            - University of Southern California

A listing of T. Rowe's current representative clients is as follows:

  - Allegheny Power System                  - Milliken & Company
  - Armco, Inc.                             - New England Electric System
  - Automobile Club of Southern California  - New York Power Authority
  - Baltimore Gas & Electric
     Company (BGE)                          - Parsons Brinckerhoff
  - The Black & Decker Corporation          - The Pittston Company
  - Consolidated Freightways Corporation    - Polo Ralph Lauren
  - Costco Wholesale                        - PRC Inc.
  - Crawford & Company                      - Puget Sound Energy
  - Cyprus Amex                             - Rank America
  - Dames & Moore                           - Rochester Gas and Electric
                                               Corporation
  - DataCard                                - The Rouse Company
  - Data General Corporation                - Simplex Time Recorder Co.
  - The Dial Corporation                    - Southeastern Freight Lines
  - Entergy Corporation                     - State of Florida
  - Federal Deposit Insurance               - State of Illinois
     Corporation
  - Hocchst Marion Roussel, Inc.            - State of Oklahoma
  - Hyatt Corporation                       - Warner-Lambert Company
  - Leo Burnett                             - Western Digital Corporation
  - Lorrilard Tobacco Company               - Winn-Dixie Stores



A listing of CRM's current representative clients is as follows:

  - Indiana University Foundation           - The McGraw-Hill Companies, Inc
  - Maine State Retirement                  - The UCLA Foundation
  - National Basketball Association
     Players Pension Plan                   - University of Cincinnati
  - New Mexico State Investment Council     - University of Illinois Foundation
  - Niagara Mohawk Power Corp.              - U.S. Airways
  - St. Mary's College of California



A listing of BIAM's current representative clients is as follows:

  - CALSTRS                                 - Pfizer Retirement Annuity Plan
  - City of Dallas Employees'               - Maryland State Retirement System
     Retirement Fund
  - Loyola Marymount University             - Screen Actors Guild-Producers
     Endowment Fund                            Pension Plan
  - LTV Steel Corporation Pension
     Fund                                   - Tuft's University Endowment Fund
  - Major League Baseball Players           - Worcester County Retirement System
     Benefit Plan



- ----------------------------
Allmerica Investment Trust             36
<PAGE>

A listing of Putnam Advisory Company, Inc.'s ("PAC")* current representative
clients is as follows:

  - Bacardi Corporation                     - Matsushita Electric Corporation
                                                    of America
  - California Public Employees'            - New York Philharmonic Orchestra
     Retirement System                      - The Nemours Foundation
  - Hercules Incorporated                   - The Robert Wood Johnson Foundation
  - Kemper Insurance                        - United Furniture Workers, AFL-CIO
  - Los Angeles County Employees'           - U.S. Chamber of Commerce
     Retirement Association

   *(PAC is the institutional affiliate of Putnam.)

   A listing of TCW's current representative clients is as follows:

  - Bakery, Confectionery, Tobacco Workers  - Maryland State Retirement System
     & Grain Millers International Union    - MCI Communications Corporation
  - Boilermaker-Blacksmith National         - Michigan State University
     Pension Trust                          - Minnesota State Board of
                                                Investment
  - Boston College                          - New York State Common Retirement
                                                Fund
  - Bradley Foundation                      - Northwest Airlines, Inc.
  - California State Teachers'              - Oklahoma Public Employees
     Retirement System                          Retirement System
  - Cargill, Incorporated                   - Oregon Public Employees'
  - Central States Pension Plan                 Retirement System
  - Cincinnati Bell Inc.                    - Pfizer, Inc.
  - Colorado Public Employees               - SunAmerica Life Insurance Company
     Retirement Association                 - Textron, Inc.
  - Eastman Kodak Company                   - The Boeing Company
  - Florida State Board of Administration   - The Duke Endowment
  - General Mills, Inc.                     - The John D. and Catherine T.
  - GTE Investment Management Corporation       MacArthur Foundation
  - Halliburton Company                     - The Kresge Foundation
  - Hallmark Cards, Inc.                    - The University of Notre Dame Du
                                                Lac
  - IBM Corporation                         - University of Pittsburgh
  - Illinois State Board of Investment      - U.S. West
  - Lehigh University                       - Vanderbilt University
  - Litton Industries, Inc.                 - Xerox Corporation


A listing of MAS's current representative clients is as follows:

  - AT&T                                    - New York Philharmonic Society
  - Boeing Company                          - Philip Morris, Inc.
  - Federal Reserve                         - Smithsonian Institution
  - J. Paul Getty Trust                     - United Technologies Corporation
                                            - University of Notre Dame


A listing of J.P. Morgan's representative clients is as follows:

A listing of SAW's current representative clients is as follows:

  - Archdiocese of Boston                   - Ford Motor Company
  - AT&T                                    - Harcourt General
  - BankAmerica                             - New York Public Library

  - Boston Symphony Orchestra               - Northeastern University
  - City of Houston


A listing of AAM's current representative clients is as follows:

  - First Allmerica                         - Hannibal Regional Hospital
  - Citizens Insurance                      - Massachusetts Education and
  - Hanover Insurance                            Government Association Workers
  - City of Worcester Retirement                 Compensation Trust
     System
  - Worcester County Contributory           - Farm Credit System Association
                                                Retirement System Captive
                                                Insurance Company



                                                     --------------------------
                                       37            Allmerica Investment Trust
<PAGE>

Under the terms of the Management Agreement, the Trust recognizes the Manager's
control of the name "Allmerica Investment Trust." The Trust agrees that its
right to use that name is non-exclusive and can be terminated by the Manager at
any time.

SERVICES AGREEMENTS

UNDERWRITER

Allmerica Investments, Inc. ("AII"), located at 440 Lincoln Street, Worcester,
Massachusetts 01653, (508) 855-1000, serves as the Trust's distributor pursuant
to a Distribution Agreement. AII is an indirect, wholly-owned subsidiary of AFC.
The following is a list of persons who are affiliated with both the Trust and
AII.

                          POSITION(S) HELD                     POSITION(S) HELD
           NAME           WITH THE TRUST                       WITH AII
           ----           --------------                       --------

    Paul T. Kane          Assistant Vice President      Assistant Vice President
                          and Treasurer (Principal
                          Accounting Officer)

    John F. O'Brien       Chairman of the Board         Director

    Richard M. Reilly     President                     Director


FUND RECORDKEEPING SERVICES AGENT AND CUSTODIAN

Investors Bank & Trust Company ("IBT") replaced First Data Investor Services
Group, Inc. ("Investor Services Group") as the Trust's fund record keeping
services agent and replaced Bankers Trust Company as Custodian of the cash and
investment securities of the Trust on April 1, 1999. IBT is located at 200
Clarendon Street, 16th Floor, Boston, MA 02116. Under the terms of a Custodian
Agreement, IBT provides certain fund accounting, custodian and administration
services, including, but not limited to, determining the net asset value per
share of each of the Funds and maintaining the accounting records of the Trust;
and holding in custody the Trust's portfolio securities and receiving and
delivering them upon purchases and sales. IBT is entitled to receive an annual
fee for its services based on Fund assets and certain out-of-pocket expenses.
The Custodian Agreement provides for an initial term of three years and
thereafter renews automatically for successive one-year terms unless advance
notice of termination is delivered by the non-renewing party. The Custodian
Agreement may be terminated prior to the expiration of the initial term or a
renewal term provided certain conditions are met. The Custodian Agreement with
IBT is similar to the Fund Accounting Services Agreement previously in effect
with Investor Services Group and the Custodian Agreement previously in effect
with Bankers Trust Company. The compensation paid to Investor Services Group and
Bankers Trust Company was similar to the compensation which is paid to IBT
in terms of total dollar amount paid. The total fund recordkeeping fees paid to
Investor Services Group for the following periods were as follows:

  THREE-MONTHS ENDED            YEAR ENDED                       YEAR ENDED
     MARCH 31, 1999          DECEMBER 31, 1998              DECEMBER 31, 1997
     --------------          -----------------              -----------------

        $240,112                  $883,909                          $748,941


The total fees paid to Bankers Trust Company for custodial services for the
following periods were as follows:

  THREE-MONTHS ENDED             YEAR ENDED                       YEAR ENDED
    MARCH 31, 1999            DECEMBER 31, 1998              DECEMBER 31, 1997
    --------------            -----------------              -----------------

       $194,918                    $850,873                          $743,606


The total fee paid to IBT for fund accounting, custodial and administration
services for the nine-months ended December 31, 1999 was $1,653,590.



- ---------------------------
Allmerica Investment Trust               38
<PAGE>

INDEPENDENT ACCOUNTANTS

PricewaterhouseCoopers LLP, 160 Federal Street, Boston, Massachusetts 02110,
serves as the Fund's independent accountants providing audit and accounting
services including (i) examination of the annual financial statements, (ii)
assistance and consultation with respect to the preparation of filings with the
Securities and Exchange Commission, and (iii) review of annual income tax
returns.

                    BROKERAGE ALLOCATION AND OTHER PRACTICES

In accordance with the Management Agreement and sub-advisory agreements, the
respective Sub-Adviser has the responsibility for the selection of brokers for
the execution of purchases and sales of the securities in a given Fund's
portfolio subject to the direction of the Trustees. The Sub-Advisers place the
Funds' portfolio transactions with brokers and, if applicable, negotiate
commissions.

Broker-dealers may receive brokerage commissions on portfolio transactions of
the Funds. The Sub-Advisers also may place portfolio transactions with such
broker-dealers acting as principal, in which case no brokerage commissions are
payable but other transaction costs are incurred. The Funds have not dealt nor
do they intend to deal exclusively with any particular broker-dealer or group of
broker-dealers. It is each Fund's policy always to seek best execution. This
means that each Fund's portfolio transactions will be placed where the Fund can
obtain the most favorable combination of price and execution services in
particular transactions or as provided on a continuing basis by a broker-dealer,
and that the Fund will deal directly with a principal market maker in connection
with over-the-counter transactions, except when it is believed that best
execution is obtainable elsewhere. In evaluating the execution services of a
broker-dealer, including the overall reasonableness of its brokerage commissions
paid, consideration is given to the firm's general execution and operational
capabilities and to its reliability, integrity and financial condition. Subject
to the practice of always seeking best execution, the Funds' securities
transactions may be executed by broker-dealers who also provide research
services (as defined below) to the Funds, the Sub-Advisers and the other clients
advised by the Sub-Advisers. Examples of such research services include reports
on specific companies or industries, economic and financial data, performance
measurement services, computer databases and pricing and appraisal services. The
sub-advisers may use all, some or none of such research services in providing
investment advisory services to each of its investment companies and other
clients, including the Funds. To the extent that such services are used, they
tend to reduce the expenses of the Sub-Advisers. In the opinion of the Sub-
Advisers it is impossible to assign an exact dollar value to such services.

BROKERAGE AND RESEARCH SERVICES

The agreements provide that, subject to such policies as the Trustees may
determine, the Sub-Advisers may cause a given Fund to pay a broker-dealer which
provides brokerage and research services an amount of commission for effecting a
securities transaction for that Fund in excess of the amount of commission which
another broker-dealer would have charged for effecting that transaction. As
provided in Section 28(e) of the Securities Exchange Act of 1934, "brokerage and
research services" include advice as to the value of securities; the
advisability of investing in, purchasing or selling securities; the availability
of securities or purchasers or sellers of securities; furnishing analyses and
reports concerning issuers, industries, securities, economic factors and trends;
portfolio strategy and performance of accounts; and effecting securities
transactions and performing functions incidental thereto (such as clearance and
settlement). The Sub-Advisers must determine in good faith that such greater
commission is reasonable in relation to the value of the brokerage and research
services provided by the executing broker-dealer viewed in terms of that
particular transaction or the overall responsibilities of the Sub-Advisers to
its respective Funds and all other clients. The Sub-Advisers also may consider
sales by broker-dealers of variable and group annuity contracts and variable
life insurance policies that contemplate the Funds as an investment option as a
factor in the selection of broker-dealers to execute portfolio transactions.

The other investment companies and clients advised by the Sub-Advisers sometimes
invest in securities in which the Funds also invest. A Sub-Adviser also may
invest for its own account in the securities in which the Funds invest. If the
Funds, such other investment companies and other clients of the Sub- Advisers
desire to buy or sell the same portfolio security at about the same time, the
purchases and sales normally are made as nearly as practicable on a pro rata
basis in proportion to the amounts desired to be purchased or sold by each. It
is recognized that in some cases this practice could have a detrimental effect
on the price or volume of the security as far as the Funds are concerned. In
other cases,


                                                  ---------------------------
                                    39            Allmerica Investment Trust
<PAGE>

however, it is believed that this practice may produce better executions. It is
the opinion of the Trustees that the desirability of retaining the Sub-Advisers
as investment advisers to their respective Funds outweighs the disadvantages, if
any, which might result from this practice.

Brokerage commissions for each of the last three years were as follows:

<TABLE>
<CAPTION>
  FUND                                                           1999              1998            1997
  ----                                                           ----              ----            ----
  <S>                                                          <C>               <C>            <C>
  Select Emerging Markets Fund*                                  $140,922          $105,823         N/A
  Select Aggressive Growth Fund                                $1,710,414        $1,812,711     $1,238,116
  Select Capital Appreciation Fund**                             $481,557          $683,523       $474,666
  Select Value Opportunity Fund**                              $1,357,442          $742,439       $649,306
  Select International Equity Fund                               $333,988          $369,191       $453,544
  Select Growth Fund**                                         $1,017,774          $724,915       $459,136
  Select Strategic Growth Fund*                                   $56,538           $32,898         N/A
  Core Equity Fund** (formerly the Growth Fund)                $2,626,717        $1,522,185       $969,754
  Equity Index Fund                                              $185,943          $106,104       $100,012
  Select Growth and Income Fund**                              $1,216,781        $1,032,489       $962,045
</TABLE>

* The Select Emerging Markets Fund and Select Strategic Growth Fund began
operations on February 20, 1998.

** The following are the reasons for the differences in the amounts of brokerage
commissions paid for the most recent fiscal year compared to either of the two
prior fiscal years:

     (1) The differences in the amounts of brokerage commissions paid during the
     last three fiscal years for the Select Capital Appreciation Fund are due to
     a change in Sub-Advisers on April 1, 1998 and the ensuing portfolio
     turnover. (2) The differences in the amounts of brokerage commissions paid
     during the last three fiscal years for the Core Equity Fund are due to
     portfolio repositioning and normal portfolio activity trading. (3) The
     differences in the amounts of brokerage commissions paid during the last
     three fiscal years for the Select Value Opportunity Fund, Select Growth
     Fund and Select Growth and Income Fund are attributable to growth in the
     assets of each Fund.

     The Select Income Fund, Select Investment Grade Income Fund (formerly the
     Investment Grade Income Fund), Government Bond Fund and Money Market Fund
     did not incur brokerage commissions in any of these years.

     DIRECTED BROKERAGE PROGRAM

Certain Funds managed by the Manager participate in a directed brokerage program
whereby the Funds receive credit for brokerage activity and apply those credits
toward the payment of Fund expenses. Such Funds have entered into an agreement
with certain brokers which rebate a portion of commissions as credits toward
Fund expenses. In addition, this program gives Fund management the ability to
direct brokerage by firms which sell insurance products sponsored by First
Allmerica Financial and its affiliates. This second aspect of the program, which
would be limited to 15% of total commissions, has not been implemented. Such
amounts earned by the Funds in 1997, 1998 and 1999 under such agreements were as
follows:

<TABLE>
<CAPTION>
  FUND                                                      1999           1998            1997
  ----                                                      ----           ----            ----
  <S>                                                      <C>            <C>            <C>
  Select Emerging Markets Fund*                             $11,910           $561         N/A
  Select Aggressive Growth Fund                            $270,533       $229,479       $221,364
  Select Capital Appreciation Fund                           $3,127        $41,567         N/A
  Select Value Opportunity Fund                            $241,313        $96,620        $84,389
  Select International Equity Fund                          $53,537        $24,678        $70,636
  Select Growth Fund                                       $232,990       $151,581        $90,962
  Select Strategic Growth Fund                               $6,979         $5,373         N/A
  Equity Index Fund                                          $9,000          N/A           N/A
  Core Equity Fund (formerly the Growth Fund)              $335,248       $208,457       $152,829
  Select Growth and Income Fund                             $25,338       $175,705       $102,293
</TABLE>

- ----------------------------
Allmerica Investment Trust              40
<PAGE>

The Trust Declaration provides that all persons extending credit to, contracting
with, or having any claims against the Trust or a particular Fund shall look
only to the assets of the Trust or particular Fund for payment under such
credit, contract or claim, and neither the shareholders, Trustees, nor any of
the Trust's officers, employees or agents shall be personally liable thereof.
Under Massachusetts law, shareholders could, under certain circumstances, be
held liable for the obligations of the Trust. The Trust Declaration, however,
disclaims shareholder liability for acts or obligations of the Trust and
requires that notice of such disclaimer be given in each agreement, obligation
or instrument entered into or executed by the Trust or the Trustees. The Trust
Declaration provides for indemnification out of a Fund's property for all loss
and expense of any shareholder of that Fund held liable on account of being or
having been a shareholder. Thus, the risk of a shareholder incurring financial
loss on account of shareholder liability is limited to circumstances in which
the Fund of which he or she was a shareholder would be unable to meet its
obligations.

Pursuant to the Trust Declaration, a Trustee is liable for his or her own
willful misfeasance, bad faith, gross negligence or reckless disregard of the
duties involved in the conduct of the office of Trustee, but is not liable for
errors of judgment, mistakes of fact or law any act or omission in accordance
with the advice of counsel or other experts with respect to the meaning of the
Trust Declaration, or for failing to follow such advice.

                       CAPITAL STOCK AND OTHER SECURITIES

The Trust has an unlimited authorized number of shares of beneficial interest
which may be divided into an unlimited number of series of such shares, and
which are divided presently into 14 series of shares, one series underlying each
Fund. The Trust's shares are entitled to one vote per share (with proportional
voting for fractional shares). The rights accompanying Fund shares are vested
legally in the Separate Accounts. As a matter of policy, however, holders of
variable premium life insurance or variable annuity contracts funded through the
Separate Accounts have the right to instruct the Separate Accounts as to voting
Fund shares on all matters to be voted on by Fund shareholders. Voting rights of
the participants in the Separate Accounts are set forth more fully in the
prospectuses or offering circular relating to those Accounts.

Matters subject to a vote by the shareholders include changes in the fundamental
policies of the Trust as described in the Prospectus and the SAI, the election
or removal of Trustees and the approval of agreements with investment advisers.
A majority, for the purposes of voting by shareholders pursuant to the 1940 Act,
is 67% or more of the voting securities of an investment company present at an
annual or special meeting of shareholders if 50% of the outstanding voting
securities of such company are present or represented by proxy or more than 50%
of the outstanding voting securities of such company, whichever is less.

The Trust is not required to hold annual meetings of shareholders. The Trustees
or shareholders holding at least 10% of the outstanding shares may call special
meetings of shareholders.

The Trust Declaration provides that, on any matter submitted to a vote of the
shareholders, all shares shall be voted by individual series, except (1) when
required by the 1940 Act, shares shall be voted in the aggregate and not by
individual series, and (2) when the Trustees have determined that the matter
affects only the interests of one or more series, then only the shareholders of
such series shall be entitled to vote thereon.

Shares are freely transferable, are entitled to dividends as declared by the
Trustees and, on liquidation of the Trust, shareholders are entitled to receive
their pro rata portion of the net assets of the Fund of which they hold shares,
but not of any other Fund. Shareholders have no preemptive or conversion rights.

The Trust Declaration provides that all persons extending credit to, contracting
with, or having any claims against the Trust or a particular Fund shall look
only to the assets of the Trust or particular Fund for payment under such
credit, contract or claim, and neither the shareholders, Trustees, nor any of
the Trust's officers, employees or agents shall be personally liable thereof.
Under Massachusetts law, shareholders could, under certain circumstances, be
held liable for the obligations of the Trust. The Trust Declaration, however,
disclaims shareholder liability for acts of obligations of the

                                                -------------------------------
                                    41            Allmerica Investment Trust
<PAGE>

Trust and requires that notice of such disclaimer be given in each agreement,
obligation or instrument entered into or executed by the Trust or the Trustees.
The Trust Declaration provides for indemnification out of a Fund's property for
all loss and expense of any shareholder of that Fund held liable on account of
being or having been a shareholder. Thus, the risk of a shareholder incurring
financial loss on account of shareholder liability is limited to circumstances
in which the Fund of which he or she was a shareholder would be unable to meet
its obligations.

Pursuant to the Trust Declaration, a Trustee is liable for his or her own
willful misfeasance, bad faith, gross negligence or reckless disregard of the
duties involved in the conduct of the office of Trustee, but is not liable for
errors of judgment, mistakes of fact or law any act or omission in accordance
with the advice of counsel or other experts with respect to the meaning of the
Trust Declaration, or for failing to follow such advice.

PURCHASE, REDEMPTION, AND PRICING OF SECURITIES BEING OFFERED

Shares of the Funds are sold in a continuous offering and currently may be
purchased only by Separate Accounts of First Allmerica or its subsidiaries. The
Separate Accounts are the funding mechanisms for variable annuity contracts and
variable life insurance policies. Shares of the Trust are also currently being
issued under separate prospectuses to Separate Accounts of Allmerica Financial
Life, First Allmerica and subsidiaries of First Allmerica which issue variable
or group annuity policies or variable premium life insurance policies ("mixed
funding"). Shares of the Trust may also be issued to Separate Accounts of
unaffiliated life insurance companies and qualified pension and retirement plans
outside of the separate account context ("shared funding"). The Trust may serve
as a funding vehicle for all types of variable annuity contracts and variable
life insurance contracts offered by various participating insurance companies
and for qualified plans. Although neither Allmerica Financial Life nor the Trust
currently foresees any disadvantage, it is conceivable that in the future such
mixed funding may be disadvantageous for variable or group annuity policyowners
or variable premium life insurance policyowners ("Policyowners"). The Trustees
of the Trust intend to monitor events in order to identify any conflicts that
may arise between such Policyowners and to determine what action, if any, should
be taken in response thereto. If the Trustees were to conclude that separate
funds should be established for variable annuity and variable premium life
separate accounts, Allmerica Financial Life would pay the attendant expenses.

As described in the Prospectus, shares of each Fund are sold and redeemed at
their net asset value as next computed after receipt of the purchase or
redemption order without the addition of any selling commission or "sales load."
The redemption price may be more or less than the shareholder's cost. Each
purchase is confirmed to the Separate Account in a written statement of the
number of shares purchased and the aggregate number of shares currently held.
Unlike the Money Market Fund which attempts to maintain a stable net asset
value, the net asset value of the other Funds will fluctuate.

The net asset value per share of each Fund is the total net asset value of that
Fund divided by the number of shares outstanding. The total net asset value of
each Fund is determined by computing the value of the total assets of that Fund
and deducting total liabilities, including accrued liabilities. The net asset
value of the shares of each Fund is determined once daily as of the close of the
New York Stock Exchange on each day on which the Exchange is open for trading,
and no less frequently than once daily on each other day (other than a day
during which no shares of the Fund were tendered for redemption and no order to
purchase or sell such shares was received by the Fund) in which there was a
sufficient degree in trading in the Fund's portfolio securities that the current
net asset value of the Fund's shares might be affected materially by changes in
the value of such portfolio securities.

Equity securities are valued based on market value if market quotations are
readily available. Portfolio securities listed or traded on national securities
exchanges, or reported on the National Association of Securities Dealers
national market reporting system, are valued at the last sale price, or, if
there have been no sales on that day, at the mean of the current bid and ask
price. Over-the-counter securities for which market quotations are readily
available are valued at the mean between the most recent bid and ask price.
Securities that are primarily traded on foreign exchanges generally are valued
at the preceding closing values of such securities on their respective
exchanges. In valuing assets, prices denominated in foreign currencies are
converted to U.S. dollar equivalents at the current exchange rate. As authorized
by the Trustees, debt securities (other than short-term obligations) of the
Funds other than the Money Market Fund are valued on the basis of valuations
furnished by pricing services which reflect broker-dealer supplied valuations
and electronic data processing techniques. Such methods include the use of
market transactions for comparable securities and various relationships between
securities which generally are recognized by institutional traders. Short-term
obligations having remaining maturities of sixty (60) days or less are valued at
amortized cost.

- ----------------------------
Allmerica Investment Trust                42
<PAGE>

Short-term debt securities of the Funds other than the Money Market Fund having
a remaining maturity of more than sixty (60) days will be valued using a
"market-to-market" method based upon either the readily available market price
or, if reliable market quotations are not available, upon quotations by dealers
or issuers for securities of a similar type, quality and maturity. "Marking-to-
market" takes into account unrealized appreciation or depreciation due to
changes in interest rates or other factors which would influence the current
fair value of such securities.

All portfolio securities of the Money Market Fund will be valued by the
amortized cost method. The purpose of this method of calculation is to attempt
to maintain a constant net asset value per share of $1.00. No assurance can be
given that this goal can be attained. Amortized cost is an approximation of
market value determined by increasing systematically the carrying value of a
security acquired at a discount or reducing systematically the carrying value of
a security acquired at a premium, so that the carrying value is equal to
maturity value on the maturity date. It does not take into consideration
unrealized gains or losses. While the amortized cost method provides certainty
and consistency in portfolio valuation, it may result in valuations of portfolio
securities which are higher or lower than the prices at which the securities
could be sold. During such periods, the yield to investors in a Fund may differ
somewhat from that obtained if the Fund were to use mark-to-market value for its
portfolio securities. For example, if the use of amortized cost resulted in a
lower (higher) aggregate portfolio value on a particular day, a prospective
investor in the Fund would obtain a somewhat higher (lower) yield than would
result from marked-to-market valuation, and existing investors would receive
less (more) investment income.

The use of the amortized cost method of valuation by the Money Market Fund is
subject to rules of the Securities and Exchange Commission. Under the rules, the
Fund is required to maintain a dollar weighted average portfolio maturity of 90
days or less and to limit its investments to instruments which (1) its Sub-
Adviser, subject to the guidelines established by the Trustees, determines
present minimal credit risks; (2) have high quality ratings or are deemed
comparable, such that they are "eligible securities" as defined below; and (3)
have remaining maturity of thirteen months (397 days) or less at the time of
purchase, or are subject to a demand feature which reduces the remaining
maturity to thirteen months or less.

The Money Market Fund may purchase only "First or Second Tier eligible
securities" which are defined to include (1) securities which have received the
highest or second highest rating by at least two nationally recognized
statistical rating organizations ("NRSRO") or by only one NRSRO if only one has
rated the security and (2) securities which are unrated, but, in the Sub-
Adviser's opinion, are of comparable quality. The Money Market Fund may purchase
securities which were long-term at issuance but have a remaining maturity of
thirteen months or less at the time of purchase if (a) the issuer has comparable
short-term debt securities outstanding which are eligible securities or (b) the
issuer has no short-term rating and the securities have either no long-term
rating or a long-term rating in one of the two highest categories by an NRSRO.

The above standards must be satisfied at the time an investment is made. If the
quality of the investment later declines, the Fund (a) may dispose of the
security within five business days of the Sub-Adviser becoming aware of the new
rating, or (b) may continue to hold the investment, but the Trustees will
evaluate whether the security continues to present minimal credit risks.

As a part of the overall duty of care they owe to the Fund's shareholders, the
Trustees have established procedures reasonably designed to stabilize the net
asset value per share of the Money Market Fund as computed for the purpose of
distribution and redemption at $1.00 per share taking into account current
market conditions and the Fund's investment objective. At such reasonable
intervals as they deem appropriate in light of current market conditions, the
Trustees will compare the results of calculating the net asset value per share
based on amortized cost with the results based on available indications of
market value. If a difference of more than 1/2 of 1% occurs between the two
methods of valuation, the Trustees will consider taking whatever steps they deem
necessary to minimize any material dilution or other unfair results, such as
shortening the average portfolio maturity or realizing gains or losses.

All other securities and assets of a Fund, any  assets whose value does not,
in the Manager's opinion, reflect fair value, will be valued at fair value as
determined in good faith pursuant to procedures adopted by the Board of Trustees
of the Trust.

                       TAXATION OF THE FUNDS OF THE TRUST

The Trust qualifies under Subchapter M of the Internal Revenue Code so that the
Trust will not be subject to federal income tax on any net income and any
capital gains to the extent they are distributed or are deemed to have been

                                                   -----------------------------
                                 43                  Allmerica Investment Trust
<PAGE>

distributed to shareholders. See the prospectuses for the Separate Accounts for
tax consequences to investors.

To comply with regulations under Section 817(h) of the Code which contains
certain diversification requirements, each Fund of the Trust will be required to
diversify its investments so that on the last day of each quarter of a calendar
year, no more than 55% of the value of its assets is represented by any one
investment, no more than 70% is represented by any two investments, no more than
80% is represented by any three investments, and no more than 90% is represented
by any four investments. Generally, securities of a single issuer are treated as
one investment and obligations of each U.S. Government agency and
instrumentality (such as the Government National Mortgage Association) are
treated for purposes of Section 817(h) as issued by separate issuers. In
addition, any security issued, guaranteed or insured (to the extent so
guaranteed or insured) by the United States or an instrumentality of the U.S.
will be treated as a security issued by the U.S. Government or its
instrumentality, whichever is applicable.

                                  UNDERWRITERS

Under a Distribution Agreement, AII has a nonexclusive right to use its best
efforts to obtain from investors unconditional orders for the continuous
offering of shares authorized for issuance by the Trust. AII does not receive
direct compensation for its services as distributor of the Trust. AII, at its
expense, may provide promotional incentives to dealers that sell variable
annuity contracts for which the Funds serve as investment vehicles.

                         CALCULATION OF PERFORMANCE DATA

The Trust may advertise performance information for the Funds and may compare
performance of the Funds with other investment or relevant indices. The Funds
may also advertise "yield", "total return" and other non-standardized total
return data. For the non-money market funds, "yield," is calculated differently
than for the Money Market Fund. The Money Market Fund may advertise "yield" or
"effective yield," ALL PERFORMANCE FIGURES ARE BASED ON HISTORICAL EARNINGS AND
ARE NOT INTENDED TO INDICATE FUTURE PERFORMANCE. A Fund's share price, yield and
total return may fluctuate in response to market conditions and other factors,
and the value of Fund shares when redeemed may be more or less than their
original cost.

YIELDS AND TOTAL RETURNS QUOTED FOR THE FUNDS INCLUDE THE EFFECT OF DEDUCTING
THE FUNDS' EXPENSES, BUT MAY NOT INCLUDE CHARGES AND EXPENSES ATTRIBUTABLE TO A
PARTICULAR INSURANCE PRODUCT. SINCE SHARES OF THE FUNDS CAN BE PURCHASED ONLY
THROUGH A VARIABLE ANNUITY OR VARIABLE LIFE CONTRACT, YOU SHOULD REVIEW
CAREFULLY THE PROSPECTUS OF THE INSURANCE PRODUCT YOU HAVE CHOSEN FOR
INFORMATION ON RELEVANT CHARGES AND EXPENSES. INCLUDING THESE CHARGES IN THE
QUOTATIONS OF THE FUNDS' YIELDS AND TOTAL RETURNS WOULD HAVE THE EFFECT OF
DECREASING PERFORMANCE. PERFORMANCE INFORMATION FOR THE INSURANCE PRODUCT MUST
ALWAYS ACCOMPANY, AND BE REVIEWED WITH, ANY PERFORMANCE INFORMATION QUOTED FOR
THE FUNDS.

YIELDS OF THE FUNDS OTHER THAN THE MONEY MARKET FUND

The 30-day (or one month) standard yields of the Funds other than the Money
Market Fund are calculated as follows:


                         YIELD = 2[( a - b + 1)/6/ - 1)]
                         -------------------------------
                                       cd

    Where:      a  = dividends and interest earned by a Fund during the period;
                b  = expenses accrued for the period (net of reimbursements);
                c  = the average daily number of shares outstanding during the
                      period entitled to receive dividends; and
                d  = the maximum offering price per share on the last day of the
                      period.

For the purpose of determining net investment income earned during the period
(variable "a" in the formula), dividend income on equity securities held by a
Fund is recognized by accruing 1/360 of the stated dividend rate of the security
each day that the security is in the Fund. Except as noted below, interest
earned on debt obligations held by a Fund is calculated by computing the yield
to maturity of each obligation based on the market value of the obligation
(including actual accrued interest) at the close of business on the last
business day of each month, or, with respect to obligations purchased during the
month, the purchase price (plus actual accrued interest) and dividing the result
by 360 and multiplying the quotient by the market value of the obligation
(including actual accrued interest) in order to determine the interest income on
the obligation for each day of the subsequent month that the obligation is held
by the Fund. For purposes of this calculation, it is assumed that each month
contains 30 days. The maturity of an obligation with a call provision is the
next call date on which the obligation reasonably may be expected to be called
or, if none, the maturity date. With respect to debt obligations purchased at a
discount or premium, the formula generally calls for amortization of the
discount or premium. The amortization schedule will be adjusted monthly to
reflect changes in the market value of such debt obligations. Expenses accrued
for the period (variable "b" in the formula) include all recurring fees charged
by

- ----------------------------
Allmerica Investment Trust              44
<PAGE>

a Fund to all shareholder accounts in proportion to the length of the base
period and the Fund's mean (or median) account size. Undeclared earned income
will be subtracted from the offering price per share (variable "d" in the
formula).

MONEY MARKET FUND - YIELD AND EFFECTIVE YIELD

The yield of the Money Market Fund refers to the net income generated by an
investment in the Fund over a stated seven-day period, expressed as an annual
percentage rate. Yield is computed by determining the net change (exclusive of
capital changes) in the value of a hypothetical pre-existing account having a
balance of 1 (one) share at the beginning of a seven-day calendar period,
dividing the net change in account value by the value of the account at the
beginning of the period, and multiplying the return over the seven-day period by
365/7. Thus the income is "annualized:" the amount of income generated by the
investment during the seven-day period is assumed to be generated each week over
a 52-week period and is shown as a percentage of the investment. For purposes of
the calculation, net change in account value reflects the value of additional
shares purchased with dividends from the original share and dividends declared
on both the original share and any additional shares, but does not reflect
realized gains or losses or unrealized appreciation or depreciation.

The effective yield is calculated similarly, but the income earned by an
investment in the Money Market Fund is assumed to be reinvested. The "effective
yield" will be slightly higher than the "yield" because of this compounding
effect.

TOTAL RETURN

The Funds may advertise total return. The total return shows what an investment
in each Fund would have earned over a specific period of time (one, five, or ten
years since commencement of operations, if less) assuming that all distributions
and dividends by the Fund were reinvested, and less all recurring fees.

From time to time, the Fund may state its total return in advertisements and
investor communications. Total return may be stated for any relevant period as
specified in the advertisement or communication. Any statement of total return
or other performance data on the Fund will be accompanied by information on the
Fund's average annual total return over the most recent four calendar quarters
and the period from the Fund's inception of operations. The Fund also may
advertise aggregate annual total return information over different periods of
time.

A Fund's average annual total return is determined by reference to a
hypothetical $1,000 investment that includes capital appreciation and
depreciation for the stated period, according to the following formula:

                                  P(1+T)n = ERV

   Where:       P  = A hypothetical initial purchase of $1,000
                T  = average annual total return
                n  = number of years
              ERV  = Ending Redeemable Value of the hypothetical purchase at the
                      end of the period

Total return quoted in advertising reflects all aspects of the Fund's return,
including the effect of reinvesting dividends and capital gains distributions,
and any change in the Fund's net asset value per share over the period.

AVERAGE ANNUAL RETURNS are calculated by determining the change in value of a
hypothetical investment in the Fund over a stated period, and calculating the
annually compounded percentage rate that would have produced the same result if
the rate of growth or decline in value has been constant over the period.
Average annual returns covering periods of less than one year are calculated by
determining the Fund's total return for the period, extrapolating that return
for a full year, and stating the result as an annual return. Because this method
assumes that performance will remain constant for the entire year when in fact
it is unlikely that performance will remain constant, average annual returns for
a partial year must be viewed as strictly theoretical information.

INVESTORS ALSO SHOULD BE AWARE THAT A FUND'S PERFORMANCE IS NOT CONSTANT OVER
TIME, BUT VARIES FROM YEAR TO YEAR. AVERAGE ANNUAL RETURN REPRESENTS AVERAGED
FIGURES AS OPPOSED TO THE ACTUAL PERFORMANCE OF THE FUND.

                                                --------------------------------
                                 45               Allmerica Investment Trust
<PAGE>

A Fund also may quote cumulative total returns which reflect the simple change
in value of an investment over a stated period. Average annual total returns and
cumulative total returns may be quoted as a percentage or as a dollar amount.
They may be calculated for a single investment, for a series of investments or
for a series of redemptions over any time period. Total returns may be broken
down into their components of income and capital in order to show their
respective contributions to total return. Performance information may be quoted
numerically or in a table, graph or similar illustration.

OTHER PERFORMANCE INFORMATION

Performance information for a Fund may be compared with: (1) the S&P 500, Dow
Jones Industrial Average, Lehman Aggregate Bond Index, Russell 2000, Russell
3000, Beta Adjusted Russell 3000, Lehman Government corporate and 90 day
Treasury Bills, Solomon High Yield Bond Index, Bank Rate Monitor, NASDAQ Index
or other unmanaged indices so that investors may compare a Fund's results with
those of a group of unmanaged securities widely regarded by investors as
representative of the securities markets in general; (2) other registered
investment companies or other investment products tracked (a) by Lipper
Analytical Services; Morningstar, Inc. and IBC/Donoghue, Inc., all widely used
independent research firms which rank mutual funds and other investment
companies by overall performance, investment objectives and assets, or (b) by
other services, companies, publications or persons who rank such investment
companies on overall performance or other criteria; (3) or the Consumer Price
Index (a measure for inflation) to assess the real rate of return from an
investment in the Fund. Unmanaged indices may assume the reinvestment of
dividends but generally do not reflect deductions for administrative and
management costs and expenses.

All performance information is based on historical results and is not intended
to indicate future performance. Performance information reflects only the
performance of a hypothetical investment during the particular time period on
which the calculations are based. Performance information should be considered
in light of the investment objectives and policies, characteristics and quality
of the Fund and the market conditions during the given time period. Yield and
total return information may be useful for reviewing the performance of the Fund
and for providing a basis for comparison with other investment alternatives.
However, unlike bank deposits or other investments which pay a fixed yield for a
stated period of time, the yield and total return do fluctuate.

PERFORMANCE INFORMATION FOR PERIOD ENDED DECEMBER 31, 1999

Set forth below is average annual total return information for the Select
Emerging Markets Fund, Select Aggressive Growth Fund, Select Capital
Appreciation Fund, Select Value Opportunity Fund, Select International Equity
Fund, Select Growth Fund, Select Strategic Growth Fund, Core Equity Fund
(formerly the Growth Fund), Equity Index Fund, Select Growth and Income Fund,
Select Income Fund, Select Investment Grade Income Fund (formerly the Investment
Grade Income Fund), Government Bond Fund and Money Market Fund for the 1 year, 5
year, 10 year and/or since inception (the Trust began operations on April 29,
1985) periods ended December 31, 1999, yields for the Select Income Fund, Select
Investment Grade Income Fund and Government Bond Fund for the 30-day period
ended December 31, 1999 and yield and effective yield information for the Money
Market Fund for the seven-day period ended December 31, 1999.

AVERAGE ANNUAL TOTAL RETURNS FOR PERIODS ENDED DECEMBER 31, 1999
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                   1 Year Period     5 Year Period      10 Year Period     Since Inception
                                                   -------------     -------------      --------------     ---------------
  <S>                                              <C>               <C>                <C>                <C>
  Select Emerging Markets Fund                        65.72%             N/A                N/A                 15.22%*
  Select Aggressive Growth Fund                       38.66%            23.32%              N/A                 20.71%
  Select Capital Appreciation Fund                    25.36%             N/A                N/A                 21.42%
  Select Value Opportunity Fund                       (4.70)%           13.52%              N/A                 11.57%
  Select International Equity Fund                    31.71%            18.54%              N/A                 15.47%
  Select Growth Fund                                  29.80%            29.06%              N/A                 20.57%
  Select Strategic Growth Fund                        16.06%             N/A                N/A                  6.89%*
  Core Equity Fund (formerly the Growth Fund)         29.33%            25.23%             17.31%               17.47%
  Equity Index Fund                                   20.41%            27.77%              N/A                 20.66%
</TABLE>

- ----------------------------
Allmerica Investment Trust                                        46
<PAGE>

<TABLE>
<CAPTION>
                                                   1 Year Period     5 Year Period      10 Year Period        Since Inception
                                                   -------------     -------------      --------------        ---------------
<S>                                                <C>               <C>                <C>                   <C>
  Select Growth and Income Fund                        18.43%             21.69%              N/A                  15.92%
  Select Income Fund                                   (0.85)%             6.92%              N/A                   5.52%
  Select Investment Grade Income Fund                  (0.97)%             7.38%             7.69%                  8.26%
     (formerly Investment Grade Income Fund)
  Government Bond Fund                                  0.23%              6.22%              N/A                   6.16%
  Money Market Fund                                     5.19%              5.47%             5.23%                  5.80%
</TABLE>

* Not Annualized

The Core Equity Fund (formerly the Growth Fund), Select Investment Grade Income
Fund (formerly the Investment Grade Income Fund) and the Money Market Fund all
began business operations on April 29, 1985. The Equity Index Fund began
operations on September 28, 1990. The Government Bond Fund began operations on
August 26, 1991. The Select Aggressive Growth Fund, Select Growth Fund, Select
Growth and Income Fund and Select Income Fund began operations on August 21,
1992. The Select Value Opportunity Fund began operations on April 30, 1993. The
Select International Equity Fund began operations on May 2, 1994. The Select
Capital Appreciation Fund began operations on April 28, 1995. The Select
Emerging Markets Fund and Select Strategic Growth Fund began operations on
February 20, 1998.


                            YIELDS FOR 30-DAY PERIODS
                             ENDED DECEMBER 31, 1999
                             -----------------------
                                   (Unaudited)

Select Income Fund                             6.87 %
Select Investment Grade Income Fund            7.04 %
  (formerly Investment Grade Income Fund)
Government Bond Fund                           6.92 %

<TABLE>
<CAPTION>
                          YIELD FOR SEVEN DAY PERIOD            EFFECTIVE YIELD FOR SEVEN DAY PERIOD
                          ENDED DECEMBER 31, 1999                       ENDED DECEMBER 31, 1999
                          -----------------------                       -----------------------
                                (Unaudited)                                   (Unaudited)
<S>                             <C>                                           <C>
Money Market Fund                  5.57%                                         6.12%
</TABLE>


                              FINANCIAL STATEMENTS

The Trust's Financial Statements and related notes and the report of the
independent accountants contained in the Trust's annual report for the fiscal
year ended December 31, 1999 are incorporated by reference into this Statement
of Additional Information.

                                                --------------------------------
                                   47             Allmerica Investment Trust
<PAGE>

                                    APPENDIX

Descriptions of Moody's Investors Service, Inc. ("Moody's") and Standard &
Poor's Ratings Service, a division of McGraw-Hill Companies, Inc. ("S&P")
commercial paper and bond ratings:

COMMERCIAL PAPER RATINGS

MOODY'S EMPLOYS THREE DESIGNATIONS, ALL JUDGED TO BE INVESTMENT GRADE, TO
INDICATE THE RELATIVE REPAYMENT CAPACITY OF RATED ISSUERS. THE TWO HIGHEST
DESIGNATIONS ARE AS FOLLOWS:

     Issuers rated Prime-1 (or related supporting institutions) have a superior
     capacity for repayment of short-term promissory obligations. Prime-1
     repayment capacity normally will be evidenced by the following
     characteristics:

     -    Leading market positions in well-established industries.

     -    High rates of return on funds employed.

     -    Conservative capitalization structures with moderate reliance on debt
          and ample asset protection.

     -    Broad margins in earnings coverage of fixed financial charges and high
          internal cash generation.

     -    Well-established access to a range of financial markets and assured
          sources of alternate liquidity.

     Issuers rated Prime-2 (or related supporting institutions) have a strong
     capacity for repayment of short-term promissory obligations. This normally
     will be evidenced by many of the characteristics cited above, but to a
     lesser degree. Earnings trends and coverage ratios, while sound, will be
     subject more to variation. Capitalization characteristics, while still
     appropriate, may be more affected by external conditions. Ample alternate
     liquidity is maintained.

     S&P COMMERCIAL PAPER RATINGS ARE GRADED INTO SEVERAL CATEGORIES, RANGING
     FROM "A-1" FOR THE HIGHEST QUALITY OBLIGATIONS TO "D" FOR THE LOWEST. THE
     TWO HIGHEST RATING CATEGORIES ARE DESCRIBED AS FOLLOWS:

     A-1 - This highest category indicates that the degree of safety regarding
     timely payment is strong. Those issues determined to possess extremely
     strong safety characteristics are denoted with a plus (+) sign designation.

     A-2 - Capacity for timely payment on issues with this designation is
     satisfactory. However, the relative degree of safety is not as high as for
     issues designated A-1.

     MUNICIPAL OBLIGATIONS

Moody's ratings for state and municipal and other short-term obligations will be
designated Moody's Investment Grade ("MIG"). This distinction is in recognition
of the differences between short-term credit risk and long-term risk. Factors
affecting the liquidity of the borrower are uppermost in importance in the
short-term borrowing, while various factors of the first importance in long-term
borrowing risk are of lesser importance in the long run. Symbols used will be as
follows:

     MIG-1 - This designation denotes best quality. There is present strong
     protection by established cash flows, superior liquidity support or
     demonstrated broad-based access to the market for refinancing.

     MIG-2 - This designation denotes high quality. Margins of protection are
     ample although not so large as in the preceding group.

- ----------------------------
Allmerica Investment Trust              48
<PAGE>

A short-term rating also may be assigned on an issue having a demand feature.
Such ratings will be designated as VMIG to reflect such characteristics as
payment upon periodic demand rather than fixed maturity dates and payment
relying on external liquidity. Additionally, investors should be alert to the
fact that the source of payment may be limited to the external liquidity with no
or limited legal recourse to the issuer in the event that demand is not met.
VMIG-1 and VMIG-2 ratings carry the same definitions as MIG-1 and MIG-2,
respectively.

DESCRIPTION OF MOODY'S BOND RATINGS

     Aaa - Bonds that are rated Aaa are judged to be of the best quality. They
     carry the smallest degree of investment risk and generally are referred to
     as "gilt edge". Interest payments are protected by a large or exceptionally
     stable margin and principal is secure. While the various protective
     elements are likely to change, such changes as can be visualized are most
     unlikely to impair the fundamentally strong position of such issues.

     Aa - Bonds that are rated Aa are judged to be of high quality by all
     standards. Together with the Aaa group, they comprise what are known
     generally as high-grade bonds. They are rated lower than the best bonds
     because margins of protection may not be as large as in Aaa securities or
     fluctuation of protective elements may be of greater amplitude or there may
     be other elements present which make the long-term risks appear somewhat
     larger than in Aaa securities.

     A - Bonds that are rated A possess many favorable investment attributes and
     are to be considered as upper medium grade obligations. Factors giving
     security to principal and interest are considered adequate, but elements
     may be present that suggest a susceptibility to impairment some time in the
     future.

     Baa - Bonds that are rated Baa are considered to be medium grade
     obligations, i.e., they are neither highly protected nor poorly secured.
     Interest payments and principal security appear adequate for the present
     but certain protective elements may be lacking or may be characteristically
     unreliable over any great length of time. Such bonds lack outstanding
     investment characteristics and in fact have speculative characteristics as
     well.

     Ba - Bonds that are rated Ba are judged to have speculative elements; their
     future cannot be considered as well assured. Often the protection of
     interest and principal payments may be very moderate and thereby not well
     safeguarded during both good and bad times over the future. Uncertainty of
     position characterizes bonds in this class.

     B - Bonds that are rated B generally lack characteristics of a desirable
     investment. Assurance of interest and principal payments or maintenance of
     other terms of the contract over any long period of time may be small.

     Those bonds within the Aa, A, Baa, Ba, and B categories that Moody's
     believes possess the strongest credit attributes within those categories
     are designated by the symbols Aa1, A1, Baa1, Ba1, and B1.

     DESCRIPTION OF S&P'S DEBT RATINGS

     AAA - Debt rated AAA has the highest rating assigned by S&P. Capacity to
     pay interest and repay principal is extremely strong.

     AA - Debt rated AA has a very strong capacity to pay interest and repay
     principal and differs from AAA issues only in a small degree.

     A - Debt rated A has a strong capacity to pay interest and repay principal,
     although it is somewhat more susceptible to the adverse effects of changes
     in circumstances and economic conditions than debt in higher rated
     categories.

     BBB - Debt rated BBB is regarded as having an adequate capacity to pay
     interest and repay principal. Whereas it normally exhibits adequate
     protection parameters, adverse economic conditions or changing
     circumstances are more likely to lead to a weakened capacity to pay
     interest and repay principal for debt in this category than in higher rates
     categories.

                                                  -----------------------------
                                   49               Allmerica Investment Trust
<PAGE>

     BB, B, CCC, CC, C - Debt rated BB, B, CCC, CC, or C is regarded as having
     predominantly speculative characteristics with respect to capacity to pay
     interest and repay principal. BB indicates the least degree of speculation
     and C the highest. While such debt will likely have some quality and
     protective characteristics, these are outweighed by large uncertainties or
     major exposures to adverse conditions.

     Plus (+) or (-): The ratings from AA to CCC may be modified by the addition
     of a plus or minus sign to show relative standing within the major
     categories.

- ----------------------------
Allmerica Investment Trust        50
<PAGE>

PART C.  OTHER INFORMATION

Item 23.                       Exhibits
                               --------

Exhibit 1          Agreement and Declaration of Trust, dated October 11, 1984,
                   as amended May 12, 1992 was filed previously in
                   Post-effective Amendment No. 36 on April 15, 1998 and is
                   incorporated herein by reference.

Exhibit 2          Bylaws as amended May 10, 1999 are filed herein.

Exhibit 3          None

Exhibit 4(a)       Management Agreement between Registrant and Allmerica
                   Financial Investment Management Services, Inc. (the
                   "Manager") dated April 16, 1998 (compensation schedule
                   amended as of September 1, 1999) is filed herein.

Exhibit 4(b)       Sub-Adviser Agreement between the Manager and Schroder
                   Capital Management International Inc. with respect to the
                   Select Emerging Markets Fund dated April 16, 1998 was filed
                   previously in Post- effective Amendment No. 37 on February
                   25, 1999 and is incorporated herein by reference.

Exhibit 4(c)       Sub-Adviser Agreement between the Manager and Nicholas-
                   Applegate Capital Management, L.P. with respect to the Select
                   Aggressive Growth Fund dated April 16, 1998 (compensation
                   schedule amended as of September 1, 1999) is filed herein.

Exhibit 4(d)       Sub-Adviser Agreement between the Manager and T. Rowe Price
                   Associates, Inc. with respect to the Select Capital
                   Appreciation Fund dated April 16, 1998 was filed previously
                   in Post-effective Amendment No. 37 on February 25, 1999 and
                   is incorporated herein by reference.

Exhibit 4(e)       Sub-Adviser Agreement between the Manager and Cramer
                   Rosenthal McGlynn, LLC dated April 16, 1998 with respect to
                   the Select Value Opportunity Fund was filed previously in
                   Post-effective Amendment No. 37 on February 25, 1999 and is
                   incorporated herein by reference.

Exhibit 4(f)       Sub-Adviser Agreement between the Manager and Bank of
                   Ireland Asset Management (U.S.) Limited with respect to the
                   Select International Equity Fund dated April 16, 1998 was
                   filed previously in Post-effective Amendment No. 37 on
                   February 25, 1999 and is incorporated herein by reference.

Exhibit 4(g)       Sub-Adviser Agreement between the Manager and Putnam
                   Investment Management, Inc. with respect to the Select
                   Growth Fund dated April 16, 1998 was filed previously in
                   Post-effective Amendment No. 37 on February 25, 1999 and is
                   incorporated herein by reference.

Exhibit 4(h)       Form of Sub-Adviser Agreement between the Manager and TCW
                   Investment Management Company with respect to the Select
                   Strategic Growth Fund dated April 1, 2000 is filed herein.

Exhibit 4(i)       Sub-Adviser Agreement between the Manager and Miller Anderson
                   & Sherrerd, LLP with respect to the Core Equity Fund
                   (formerly the Growth Fund) dated April 16, 1998 was filed
                   previously in Post-effective Amendment No. 37 on February 25,
                   1999 and is incorporated herein by reference.

Exhibit 4(j)       Sub-Adviser Agreement between the Manager and J. P. Morgan
                   Investment Management Inc. with respect to the Select Growth
                   and Income Fund dated April 1, 1999 was filed previously in
                   Post-effective Amendment No. 38 on April 29, 1999 and is
                   incorporated herein by reference.

Exhibit 4(k)       Sub-Adviser Agreement between the Manager and Standish, Ayer
                   & Wood, Inc. with respect to the Select Income Fund dated
                   April 16, 1998 was filed previously in Post-effective
                   Amendment No. 37 on February 25, 1999 and is incorporated
                   herein by reference.

                                       1
<PAGE>


Exhibit 4(l)       Sub-Adviser Agreement between the Manager and Allmerica
                   Asset Management, Inc. with respect to the Equity Index
                   Fund, Select Investment Grade Income Fund (formerly the
                   Investment Grade Income Fund), Government Bond Fund and
                   Money Market Fund dated April 16, 1998 was filed previously
                   in Post-effective Amendment No. 37 on February 25, 1999 and
                   is incorporated herein by reference.

Exhibit 5          Distribution Agreement with Allmerica Investments, Inc.
                   dated February 25, 1998 was filed previously in
                   Post-effective Amendment No. 36 on April 15, 1998 and is
                   incorporated herein by reference.

Exhibit 6          None

Exhibit 7          Custodian Agreement with Investors Bank & Trust Company is
                   filed herein.

Exhibit 8          Administration Services Agreement between Manager, Registrant
                   and Investors Bank & Trust Company is filed herein.

Exhibit 8(a)       Securities Lending Agency Agreement with Investors Bank &
                   Trust Company is filed herein.

Exhibit 9          Opinion and consent of counsel is filed herein.

Exhibit 10         Consent of Independent Accountants is filed herein.

                                       2
<PAGE>

Exhibit 11         None

Exhibit 12         Participation Agreement among Registrant, the Manager and
                   First Allmerica Financial Life Insurance Company dated
                   February 16, 1999 was filed previously in Post-effective
                   Amendment No. 37 on February 25, 1999 and is incorporated
                   herein by reference.

Exhibit 12(a)      Participation Agreement among Registrant, the Manager and
                   Allmerica Financial Life Insurance and Annuity Company dated
                   February 16, 1999 was filed previously in Post-effective
                   Amendment No. 37 on February 25, 1999 and is incorporated
                   herein by reference.

Exhibit 13         None

Exhibit 14         None

Exhibit 15         None

Exhibit 16         Code of Ethics of Allmerica Investment Trust is filed herein.

Exhibit 17         Power of Attorney is filed herein.


Item 24.           Persons Under Common Control with Registrant
                   --------------------------------------------

Registrant was organized by State Mutual Life Assurance Company of America, now
known as First Allmerica Financial Life Insurance Company ("First Allmerica"),
primarily for the purpose of providing a vehicle for the investment of assets
received by various separate investment accounts ("Separate Accounts")
established by First Allmerica and life insurance company subsidiaries of First
Allmerica including Allmerica Financial Life Insurance and Annuity Company
("Allmerica Financial Life"). The assets in such Separate Accounts are, under
state law, assets of the life insurance companies which have established such
accounts. Thus at any time First Allmerica and its life insurance company
subsidiaries will own such of Registrant's outstanding shares as are purchased
with Separate Account assets; however, where required to do so, First Allmerica
and its life insurance company subsidiaries will vote such shares only in
accordance with instructions received from owners of the contracts pursuant to
which sums are placed in such Separate Accounts.

Item 25.           Indemnification
                   ----------------

Article VIII of Registrant's Agreement and Declaration Trust, entitled
"Indemnification," was filed previously in Post-effective Amendment No. 36 on
April 15, 1998 and is incorporated herein by reference.

Article III, Section 12 of the Bylaws of First Allmerica was filed previously in
Post-effective Amendment No. 36 on April 15, 1998 and is incorporated herein by
reference.

Item 26.           Business and Other Connections of Investment Manager and Sub-
                   -------------------------------------------------------------
                   Advisers
                   --------

The following Schedule Ds of Form ADV are incorporated by reference: Nicholas-
Applegate Capital Management, L.P., File No. 801-21442; Allmerica Asset
Management, Inc., File No. 801-44189; Allmerica Financial Investment Management
Services, Inc., File No. 801-55463; Miller, Anderson & Sherrerd, LLP, File No.
801-10437; Bank of Ireland Asset Management (U.S.) Limited, File No. 801-29606;
J.P. Morgan Investment Management Inc., File No. 801-21011; T. Rowe Price
Associates, Inc., File No. 801-856; Putnam Investment Management, Inc., File No.
801-7974; Cramer Rosenthal McGlynn, LLC, File No. 801-55244; Standish, Ayer &
Wood, Inc., File No. 801-584; Schroder Investment Management North America Inc.,
File No. 801-15834; and TCW Investment Management Company, File No. 801-20975.


                                       3
<PAGE>

Item 27.           Principal Underwriters
                   ----------------------

(a) Allmerica Investments, Inc., the Distributor, does not act as principal
underwriter, depositor or investment adviser for any other investment company.

(b) The following information is provided with respect to the directors and
officers of Allmerica Investments, Inc., the Distributor:

<TABLE>
<CAPTION>
Name and Principal Business             Positions and Offices with             Positions and Offices with
         Address                               Distributor                              Registrant
         -------                               -----------                              ----------
<S>                                     <C>                                    <C>
John F. Kelly                                  Director                                    N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

John F. O'Brien                                Director                                    Trustee
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Stephen Parker                                 Director                                    N/A
Allmerica Financial                            Chief Executive Officer
440 Lincoln Street                             President
Worcester, MA 01653
- -------------------

Richard M. Reilly                              Director                                    Trustee, President
Allmerica Financial Life                       Chairman of the Board
Insurance and Annuity Company
440 Lincoln Street
Worcester, MA 01653
- -------------------

Eric A. Simonsen                               Director                                    N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Margaret L. Abbott                             Vice President                              N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Emil J. Aberizk Jr.                            Vice President                              N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Abigail M. Armstrong                           Counsel                                     N/A
Allmerica Financial                            Assistant Secretary
440 Lincoln Street
Worcester, MA 01653
- -------------------

Edward T. Berger                               Chief Compliance Officer                    N/A
Allmerica Financial                            Vice President
440 Lincoln Street
Worcester, MA 01653
- -------------------

Michael J. Brodeur                             Vice President                              N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------
</TABLE>

                                       4
<PAGE>

<TABLE>
<CAPTION>
Name and Principal Business             Positions and Offices with             Positions and Offices with
         Address                               Distributor                              Registrant
         -------                               -----------                              ----------
<S>                                     <C>                                    <C>
Kevin A. Chute                                 Assistant Vice President                    N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Mark R. Colborn                                Vice President                              N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Claudia J. Eckels                              Vice President Operations                   N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Mary Eldridge                                  Secretary/Clerk                             N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Lee W. Erickson                                Assistant Treasurer                         N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- --------------------

Philip L. Heffernan                            Vice President                              N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Paul T. Kane                                   Assistant Vice President                    Assistant Vice President and
Allmerica Financial                                                                        Treasurer
440 Lincoln Street                                                                         (Principal Accounting Officer)
Worcester, MA 01653
- -------------------

Joseph W. MacDougall Jr.                       Assistant Secretary                         Assistant Secretary
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Daniel Mastrototaro                            Vice President                              N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Jennifer R. Mazza                              Assistant Vice President                    N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

William F. Monroe Jr.                          Vice President                              N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

David J. Mueller                               Chief Financial Officer                     N/A
Allmerica Financial                            Controller, Vice President
440 Lincoln Street                             Financial Operations Principal
Worcester, MA 01653
- -------------------

Patricia A. Norton-Gatto                       Assistant Treasurer                         N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Edward J. Parry III                            Treasurer                                   N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA  01653
- --------------------

Martin A. Snow                                 Assistant Treasurer                         N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA
- -------------

Mark G. Steinberg                              Senior Vice President                       N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------

Paula J. Testa                                 Assistant Vice President                    N/A
Allmerica Financial
440 Lincoln Street
Worcester, MA 01653
- -------------------
</TABLE>
(c)  Not Applicable.

Item 28.           Location of Accounts and Records
                   --------------------------------

Each account, book, or other document required to be maintained by Registrant
pursuant to Section 31(a) of

                                       5
<PAGE>

the Investment Company Act of 1940, as amended and Rules 31a-1 to 31a-3
thereunder are maintained by Registrant at 440 Lincoln Street, Worcester,
Massachusetts 01653 or on behalf of the Registrant by Investors Bank & Trust
Company, 200 Clarendon Street, 16th Floor, Boston, MA 02116.

Item 29.           Management Services
                   -------------------

                   Not applicable

Item 30.           Undertakings
                   ------------

                   Not applicable

                                       6
<PAGE>

                                   SIGNATURES

Pursuant to the requirements of the Securities Act and the Investment Company
Act, Allmerica Investment Trust has duly caused this Registration Statement to
be signed on its behalf by the undersigned, duly authorized, in the City of
Worcester and Commonwealth of Massachusetts on the 15th day of February, 2000.

                                            ALLMERICA INVESTMENT TRUST


                                            By: /s/ Richard M. Reilly
                                                --------------------------------
                                                Richard M. Reilly, President

Pursuant to the requirements of the Securities Act, this Registration Statement
has been signed below by the following persons in the capacities and on the
date(s) indicated.
<TABLE>
<CAPTION>
<S>                                         <C>                                              <C>
Signature                                   Title                                            Date
- ---------                                   -----                                            ----

/s/ Richard M. Reilly                       President, Chief Executive Officer               2/15/00
- -------------------------------------       and Trustee                                      -------
Richard M. Reilly

/s/ John F. O'Brien                                                                          2/15/00
- -------------------------------------       Chairman of the Board and Trustee                -------
John F. O'Brien

/s/ Paul T. Kane                                                                             2/15/00
- -------------------------------------       Treasurer (Principal Accounting Officer)         -------
Paul T. Kane

/s/ P. Kevin Condron                                                                         2/15/00
- -------------------------------------       Trustee                                          -------
P. Kevin Condron


- -------------------------------------       Trustee                                          -------
Cynthia A. Hargadon

/s/ Gordon Holmes                                                                            2/15/00
- -------------------------------------       Trustee                                          -------
Gordon Holmes

/s/ John P. Kavanaugh                                                                        2/15/00
- -------------------------------------       Trustee                                          -------
John P. Kavanaugh

/s/ Bruce E. Langton                                                                         2/15/00
- -------------------------------------       Trustee                                          -------
Bruce E. Langton

/s/ Attiat F. Ott                           Trustee                                          2/15/00
- -------------------------------------                                                        -------
Attiat F. Ott

/s/ Ranne P. Warner                         Trustee                                          2/15/00
- -------------------------------------                                                        -------
Ranne P. Warner
</TABLE>
<PAGE>

                                  SIGNATURES

Pursuant to the requirements of the Securities Act and the Investment Company
Act, Allmerica Investment Trust has duly caused this Registration Statement to
be signed on its behalf by the undersigned, duly authorized, in the City of
Worcester and Commonwealth of Massachusetts on the _____ day of __________,
_____.

                                    ALLMERICA INVESTMENT TRUST
                                    --------------------------


                                    By: _______________________________
                                        Richard M. Reilly, President

Pursuant to the requirements of the Securities Act, this Registration Statement
has been signed below by the following persons in the capacities and on the
date(s) indicated.

Signature                Title                                   Date
- ---------                -----                                   ----


_______________________    President, Chief Executive Officer    ___________
Richard M. Reilly          and Trustee

_______________________    Chairman of the Board and Trustee     ___________
John F. O'Brien

_______________________    Treasurer (Principal Accounting       ___________
Paul T. Kane               Officer)

_______________________    Trustee                               ___________
P. Kevin Condron

/s/ Cynthia A. Hargadon    Trustee                               2/16/00
- -----------------------                                          -----------
Cynthia A. Hargadon

_______________________    Trustee                               ___________
Gordon Holmes

_______________________    Trustee                               ___________
John P. Kavanaugh

_______________________    Trustee                               ___________
Bruce E. Langton

_______________________    Trustee                               ___________
Attiat F. Ott

_______________________    Trustee                               ___________
Ranne P. Warner
<PAGE>

                                  EXHIBIT INDEX


Number              Description
- ------              -----------

Exhibit 2           Bylaws

Exhibit 4(a)        Management Agreement between Registrant and Allmerica
                    Financial Investment Management Services, Inc. (the
                    "Manager") dated April 16, 1998.

Exhibit 4(c)        Sub-Adviser Agreement between the Manager and Nicholas-
                    Applegate Capital Management, L.P. with respect to the
                    Select Aggressive Growth Fund dated April 16, 1998.

Exhibit 4(h)        Form of Sub-Adviser Agreement between the Manager and TCW
                    Investment Management Company with respect to the Select
                    Strategic Growth Fund dated April 1, 2000.

Exhibit 7           Custodian Agreement with Investors Bank & Trust Company.

Exhibit 8           Administration Services Agreement between Manager,
                    Registrant and Investors Bank & Trust Company.

Exhibit 8(a)        Securities Lending Agency Agreement with Investors Bank &
                    Trust Company.

Exhibit 9           Opinion and consent of counsel.

Exhibit 10          Consent of Independent Accountants.

Exhibit 16          Code of Ethics of Allmerica Investment Trust.

Exhibit 17          Power of Attorney.


<PAGE>

                                    BYLAWS                             Exhibit 2

                                      OF

                          ALLMERICA INVESTMENT TRUST

                           (As Amended May 10, 1999)

                                   ARTICLE I

            Agreement and Declaration of Trust and Principal Office

1.1  Agreement and Declaration of Trust. These Bylaws shall be subject to the
     ----------------------------------
     Agreement and Declaration of Trust, as from time to time in effect (the
     "Declaration of Trust"), of Allmerica Investment Trust, the Massachusetts
     business trust established by the Declaration of Trust (the "Trust").

1.2  Principal Office of the Trust. The principal office of the Trust shall be
     -----------------------------
     located in Worcester, Massachusetts.


                                  ARTICLE II

                             Meetings of Trustees

2.1  Regular Meetings. Regular meetings of the Trustees may be held without call
     ----------------
     or notice at such places and at such times as the Trustees may from time to
     time determine, provided that notice of the first regular meeting following
     any such determination shall be given to absent Trustees. A regular meeting
     of the Trustees may be held without call or notice immediately after and at
     the same place as the annual meeting of the shareholders.

2.2  Special Meetings. Special meetings of the Trustees may be held at any time
     ----------------
     and at any place designated in the call of the meeting when called by the
     Chairman of the Board or the Treasurer or by two or more Trustees,
     sufficient notice thereof being given to each Trustee by the Secretary or
     an Assistant Secretary or by the officer or the Trustees calling the
     meeting.

2.3  Notice. It shall be sufficient notice to the Trustee of a special meeting
     ------
     to send notice by mail at least forty-eight hours or by telegram at least
     twenty-four hours before the meeting addressed to the Trustee at his or her
     usual or last known business or residence address or to give notice to him
     or her in person or by telephone at least twenty-four hours before the
     meeting. Notice of a meeting need not be given to any Trustee if a written
     waiver of notice, executed by him or her before or after the meeting, is
     filed with the records of the meeting, or to any Trustee who attends the
     meeting without protesting prior thereto or at its commencement the lack of
     notice to him or her. Neither notice of a meeting nor a waiver of a notice
     need specify the purposes of the meeting.

2.4  Quorum. At any meeting of the Trustees a majority of the Trustees then in
     ------
     office shall constitute a quorum. Any meeting may be adjourned from time to
     time by a majority of the votes cast upon the questions, whether or not a
     quorum is present, and the meeting may be held as adjourned without further
     notice.

2.5  Action by Written Consent. Except where otherwise required under the
     -------------------------
     Investment Company Act of 1940, as amended, and under any other State or
     Federal law or regulation applicable to the Trust, any action required or
     permitted to be taken at any meeting of the Board of Trustees or any
     committee thereof may be taken without a meeting if written consent thereto
     is signed by a
<PAGE>

     majority of the members of the Board of Trustees of committee (as the case
     may be) and such written consent if filed with the minutes of the
     proceedings of the Board of Trustees or committee; such consents shall be
     treated for all purposes as a vote at a meeting.

2.6  Remuneration. The Trustees shall determine the amount of any retainer to be
     ------------
     paid to the Trustees annually and the amount of any expense reimbursement
     or remuneration to be paid to Trustees for attendance at meetings.

                                  ARTICLE III

                                   Officers

3.1  Enumeration; Qualification. The officers of the Trust shall be a Chairman
     -----------  -------------
     of the Board, a President, a Treasurer, a Controller, a Secretary, and such
     others officers, if any, as the Trustees from time to time may be in their
     discretion elect. The Trust may also have such agents as the Trustees from
     time to time may in their discretion appoint. Any officer may, but need
     not, be a Trustee. Any two or more offices may be held by the same person.
     A Trustee or officer may, but need not, be a shareholder.

3.2  Election. The Chairman of the Board, the President, the Treasurer, the
     --------
     Controller and the Secretary shall be elected annually by the Trustees.

3.3  Tenure. The Chairman of the Board, the President, the Treasurer, the
     ------
     Controller and the Secretary shall hold office until their respective
     successors are chosen and qualified, in each case until he or she sooner
     dies, resigns, is removed or becomes disqualified.

3.4  Powers. Subject to the other provisions of these Bylaws, each officer shall
     ------
     have, in addition to the duties and powers herein and in the Declaration of
     Trust set forth, such duties and powers as are commonly incident to the
     office occupied by him or her as if the Trust were organized as a
     Massachusetts business corporation and such other duties and powers as the
     Trustees may from time to time designate.

3.5  Chairman of the Board. The Chairman of the Board shall be the chief
     ---------------------
     executive officer of the Trust unless the Trustee designate another officer
     of the Trust as its chief executive officer.

     The chief executive officer shall, subject to the control of the Trustees,
     direct and manage the affairs of the Trust.  The Chairman of the Board
     shall preside at all meetings of the shareholders and regular or special
     meetings of the Trustees.

     If the chief executive officer should be absent or unable to discharge the
     duties of his office, and officer designated by the chief executive officer
     shall act.

3.6  President. In the absence of the Chairman of the Board, the President shall
     ---------
     preside at all meetings of the shareholders and of the Trustees.

3.7  Treasurer; Controller. The Treasurer shall be the chief financial officer
     ---------  ----------
     of the Trust, and shall, subject to the provisions of the Declaration of
     Trust and to any arrangement made by the Trustees with a custodian,
     investment adviser or manager, or transfer, shareholder servicing or
     similar agent, be in charge of the valuable papers of the Trust and shall
     have such other duties and powers as may be designated from time to time by
     the Trustees or by the Chairman of the Board.

                                       2
<PAGE>

     The Controller shall be the chief accounting officer of the Trust and shall
     be in charge of its books of account and accounting records.  The
     Controller shall be responsible for preparation of financial statements of
     the Trust, and shall have such other duties and powers as may be designated
     from time to time by the Trustees or by the Chairman of the Board.

3.8  Secretary. The Secretary shall record all proceedings of the shareholders
     ---------
     and the Trustees in books to be kept therefor, which books or a copy
     thereof shall be kept at the principal office of the Trust. In the absence
     of the Secretary from any meeting of the shareholders or Trustees, an
     Assistant Secretary, or if there be none or if he or she is absent, a
     temporary Secretary chosen at such meeting shall record the proceedings
     thereof in the aforesaid books.

3.9  Resignation and Removals. Any Trustee or officer may resign at any time by
     ------------------------
     written instrument signed by him or her and delivered to the Chairman of
     the Board of the Secretary or to a meeting of the Trustees. Such
     resignation shall be effective upon receipt unless specified to be
     effective at some other time. The Trustees may remove any officer elected
     by them with or without cause. Except to the extent expressly provided in a
     written agreement with the Trust, no Trustee or officer resigning and no
     officer removed shall have any right to any compensation for any period
     following his or her resignation or removal, or any right to damages on
     account of such removal.

                                  ARTICLE IV

                                  Committees

4.1  General. The Trustees may elect, by majority vote, two or more Trustees to
     -------
     constitute an Executive Committee, which committee shall have and may
     exercise when the Trustees are not in session any or all powers of the
     Trustees in the management of the business and affairs of the Trust to the
     extent granted by the Trustees and permitted under applicable law.

     The Trustees likewise may appoint from their number other committees from
     time to time, the number (not less than two) composing such committees, and
     the functions to be performed by the same to be determined by the majority
     vote of the Trustees.  The term of any member of any committee shall be
     fixed by the Trustees.

     The Trustees may appoint an advisory board to consist of not more than five
     members.  The members of the advisory board shall be compensated in such
     manner as the Trustees may determine and shall confer with and advise the
     Trustees regarding the investments and other affairs of the Trust.  Each
     member of the advisory board shall hold office until the first meeting of
     the Trustees following the next meeting of the shareholders and until his
     or her successor is elected and qualified, or until he or she sooner dies,
     resigns, is removed or becomes disqualified, or until the advisory board is
     sooner abolished by the Trustees.

4.2  Quorum; Voting. A majority of the members of committee of the Trustees
     ------  ------
     shall constitute a quorum for the transaction of business, and any action
     of such a committee may be taken at a meeting by a vote of a majority of
     the members present (a quorum being present) or evidenced by one or more
     writings signed by such a majority. Members of a committee may participate
     in a meeting of such committee by means of conference telephone or other
     communications equipment by means of which all persons participating in the
     meeting can hear each other at the same time, and participation by such
     means shall constitute presence in person at a meeting.

                                       3
<PAGE>

                                   ARTICLE V

                                    Reports

5.1  General. The Trustees and officers shall render reports at the time and in
     -------
     the manner required by the Declaration of Trust or any applicable law.
     Officers and committees shall render such additional reports as they may
     deem desirable or as may from time to time required by the Trustees.

                                  ARTICLE VI

                                  Fiscal Year

6.1  General. Except as from time to time otherwise provided by the Trustees,
     -------
     the initial fiscal year of the Trust shall end on such date as is
     determined in advance or in arrears by the Treasurer, and subsequent fiscal
     years shall end on such date in subsequent years.

                                  ARTICLE VII

                                     Seal

7.1  General. The seal of the Trust shall consist of a flat-faced die with the
     -------
     word "Massachusetts", together with the name of the Trust and the year of
     its organization cut or engraved thereon but, unless otherwise required by
     the Trustees, the seal shall not be necessary to be placed on, and its
     absence shall not impair the validity of, any document, instrument or other
     paper executed and delivered by or on behalf of the Trust.

                                 ARTICLE VIII

                              Execution of Papers

8.1  General. Except as the Trustees may generally or in particular cases
     -------
     authorize the execution thereof in some other manner, all deeds, leases,
     agreements, contracts, bonds, notes, checks, drafts and other obligations
     made, accepted or endorsed by the Trust shall be signed by one or more duly
     elected officers of the Trust and need not bear the seal of the Trust.

                                  ARTICLE IX

                   Issuance of Shares and Share Certificates

9.1  Sale of Shares. Except as otherwise determined by the Trustees, the Trust
     --------------
     will issue and sell for cash or securities from time to time, full and
     fractional shares of its shares of beneficial interest, such shares to be
     issued and sold at a price of not less than net asset value per share as
     from time to time determined in accordance with the Declaration of Trust
     and these Bylaws and, in the case of fractional shares, at a proportionate
     reduction in such price. In the case of shares sold for securities, such
     securities shall be valued in accordance with the provisions for
     determining value of assets of officers of the Trust and severally
     authorized to take all such actions as may be necessary or desirable to
     carry out this Section 9.1.


                                       4
<PAGE>

9.2  Share Certificates. In lieu of issuing certificates for share, the
     ------------------
     Trustees or the transfer agent may either issue receipts therefor or may
     keep accounts upon the books of the Trust for the record holders of such
     shares, who shall in either case be deemed, for all purposes hereunder, to
     be the holders of certificates for such shares as if they had accepted such
     certificates and shall be held to have expressly assented and agreed to the
     terms thereof.

     The Trustees may at any time authorize the issuance of share certificates.
     In that event, each shareholder shall be entitled to a certificate stating
     the number of shares owned by him or her, in such form as shall be
     prescribed from time to time by the Trustees.  Such certificates shall be
     signed by the Chairman of the Board, the President or any Vice President
     and by the Treasurer or any Assistant Treasurer.  Such signatures may be
     facsimile if the certificate is signed by a transfer agent, or by a
     registrar, other than a Trustee, officer or employee of the Trust. In case
     any officer who has signed or whose facsimile signature has been placed on
     such certificate shall cease to be such officer before such certificate is
     issued, it may be issued by the Trust with the same effect as if he were
     such officer at the time of its issue.

9.3  Loss of Certificates. In the case of the alleged loss, destruction or
     --------------------
     mutilation of a share certificate, a duplicate certificate may be issued in
     place thereof, upon such terms as the Trustees may prescribe.

9.4  Discontinuance of Issuance of Certificates. The Trustees may at any time
     ------------------------------------------
     discontinue the issuance of share certificates and may, be written notice
     of each shareholder, require the surrender of share certificates to the
     Trust for cancellation. Such surrender and cancellation shall not affect
     the ownership of shares of the Trust.

                                   ARTICLE X

          Provisions Relating to the Conduct of the Trust's Business

10.1 Determination of Net Asset Value Per Share. Net asset value per share of
     ------------------------------------------
     each series of shares of the Trust shall mean: (i) the value of all assets
     of such series; (ii) less total liabilities of such series; (iii) divided
     by the number of shares of such series outstanding, in each case at the
     time of each determination. The net asset value per share of each series
     shall be determined as of the normal close of trading on the New York Stock
     Exchange on each day on which such Exchange is open or at such other time
     and on such other days as the Trustees may determine. As of any time other
     than the normal close of trading on such Exchange, the Trustees may cause
     the net asset value per share last determined to be determined again in a
     similar manner or adjusted to reflect changes in market values of
     securities in the portfolio, such adjustment to be made on the basis of
     changes in selected security prices determined by the Trustees to be
     relevant to the portfolio of such series or in averages or in other
     standard and readily ascertainable market data, and the Trustees may fix
     the time when such redetermined or adjusted net asset value per share of
     each series shall become effective.

     In valuing the portfolio investments of any series for determination of net
     asset value per share of such series, securities for which market
     quotations are readily available shall be valued at prices which, in the
     opinion of the Trustees or the person designated by the Trustees to make
     the determination, most nearly represent the market value of such
     securities, and other securities and assets shall be valued at their fair
     value as determined by or pursuant to the direction of the Trustees, which
     in the case of short-term debt obligations, commercial paper and repurchase
     agreements may, but need not, be on the basis of quoted yields for
     securities of comparable maturity, quality and type, or on the basis of
     amortized cost.  Expenses and liabilities of the Trust


                                       5
<PAGE>

     shall be accrued each day.  Liabilities may include such reserves for
     taxes, estimated accrued expenses and contingencies as the Trustee of their
     designates may be in their sole discretion deem fair and reasonable under
     the circumstances.  No accruals shall be in respect of taxes on unrealized
     appreciation of securities owned unless the Trustees shall otherwise
     determine.  Dividends payable by the Trust shall be deducted as at the time
     of but immediately prior to the determination of net asset value per share
     on the record date therefor.

                                  ARTICLE XI

                                 Shareholders

11.1 Shareholders Meetings. A meeting of the shareholders of the Trust or of any
     ---------------------
     one or more series of shares may be called at any time by the Trustees, by
     the President or, if the Trustees and the President shall fail to call any
     meeting of shareholders for a period of 30 days after written application
     of one or more shareholders who hold at least 10% of all outstanding shares
     of the Trust, if shareholders of all series are required under the
     Declaration of Trust to vote in the aggregate and not by individual series
     at such meeting, of any series, if shareholders of such series are entitled
     under the Declaration of Trust to vote by individual series at such
     meeting, then such shareholders may call such meeting. If the meeting is a
     meeting of the shareholders of one or more series of shares, but not a
     meeting of all shareholders of such one or more series shall be entitled to
     notice of an to vote at the meeting. Each call of a meeting shall state the
     place, date, hour and purposes of the meeting.

11.2 Record Dates. For the purpose of determining the shareholders who are
     ------------
     entitled to vote or act at any meeting or an adjournment thereof, or who
     are entitled to receive payment of any dividend or of any other
     distribution, the Trustees may from time to time fix a time, which shall be
     not more than 90 days before the date of any meeting of shareholders or the
     date for the payment of any dividend or of any other distribution, as the
     record date for determining the shareholders having the right to notice of
     and to vote at such meeting and any adjournment thereof or the right to
     receive such dividend or distribution, and in such case only shareholders
     of record on such record date shall have such right notwithstanding any
     transfer of shares on the books of the Trust after the record date; or
     without fixing such record date the Trustees may for any of such purposes
     close the register or transfer books for all or any part of such period.

                                  ARTICLE XII

                           Amendments to the Bylaws

12.1 General. These Bylaws may be amended or repealed, in whole or in part, by a
     -------
     majority of the Trustees then in office at any meeting of the Trustees, or
     by one or more writings signed by such a majority.

                                       6

<PAGE>

                                                                    Exhibit 4(a)
MANAGEMENT AGREEMENT

  Allmerica Financial Investment Management Services, Inc. (the "Adviser") and
Allmerica Investment Trust ("Trust") hereby confirm their Agreement covering
services as hereinafter set forth. The terms and provisions of this Agreement
shall take effect on April 16, 1998.

1.   The Trust hereby retains the Adviser as investment adviser for the series
     of shares of the Trust as listed on Schedule A attached hereto and for such
     other series of shares as the Trust and the Adviser may from time to time
     agree on, each such series of shares being hereinafter referred to as a
     "Fund." The Adviser shall also manage, supervise and conduct the other
     affairs and business of the Trust and matters incidental thereto, subject
     always to the provisions of the Trust's Agreement and Declaration of Trust,
     Bylaws and of the provisions of the Investment Company Act of 1940, as
     amended ("1940 Act"). In providing and performing such services, the
     Adviser will function in cooperation with and subject always to the
     direction and control of the Trustees of the Trust and in cooperation with
     the Trust's authorized officers and representatives.

2.   Investment Advisory Services. The Adviser agrees to act as the investment
     ----------------------------
     adviser for, and to manage the investment of assets of, each Fund and to
     make purchases and sales of securities for each Fund's account. The Adviser
     shall assume responsibility for the management of the portfolio securities
     of each Fund and the making and execution of all investment decisions for
     each Fund.

     A.   Investment of each Fund's assets shall be in accordance with the
          objectives and policies of each Fund as set forth in the current
          Registration Statement of the Trust filed with the Securities and
          Exchange Commission (the "SEC"), and any applicable federal and state
          laws.

     B.   The Adviser shall report to the Trustees of the Trust (the "Trustees")
          at such times and in such detail as the Trustees may from time to time
          determine to be appropriate in order to permit the Trustees to
          determine the adherence by the Adviser to the investment policies and
          legal requirements of each Fund.

     C.   The Adviser shall place all orders for the purchase and sale of
          portfolio investments for the account of the Funds with issuers,
          brokers or dealers selected by the Adviser which may include brokers
          or dealers affiliated with the Adviser. In the selection of such
          brokers or dealers and the placing of such orders, the Adviser shall
          always seek best execution (except to the extent permitted by the next
          sentence hereof), which is to place portfolio transactions where the
          Trust can obtain the most favorable combination of price and execution
          services in particular transactions or provided on a continuous basis
          by a broker or dealer, and to deal directly with a principal market
          maker in connection with over-the-counter transactions, except when it
          is believed that best execution is obtainable elsewhere. Subject to
          such policies as the Trustees may determine, the
<PAGE>

          Adviser shall not be deemed to have acted unlawfully or to have
          breached any duty created by this Agreement or otherwise solely by
          reason of its having caused the Trust to pay a broker or dealer that
          provides brokerage and research services an amount of commission for
          effecting a portfolio investment transaction which is in excess of the
          amount of commission another broker or dealer would have charged for
          effecting that transaction, if the Adviser determines in good faith
          that such excess amount of commission was reasonable in relation to
          the value of the brokerage and research services provided by such
          broker or dealer, viewed in terms of either that particular
          transaction or the overall responsibilities of the Adviser and its
          affiliates with respect to the Trust and to other clients as to which
          the Adviser or any affiliate of the Adviser exercises investment
          discretion.

     D.   Subject to the provisions of the Trust's Agreement and Declaration of
          Trust and the 1940 Act, the Adviser, at its expense, may select and
          contract with one or more investment advisers (the "Sub-Advisers") to
          provide to the Adviser such investment advice relating to the assets
          of a Fund and related services as the Adviser may from time to time
          deem appropriate, or delegate any or all of its functions hereunder to
          one or more Sub-Advisers, provided that the Trustees shall approve any
          such contract with a Sub-Adviser. So long as any Sub-Adviser serves as
          investment adviser to any Fund pursuant to a Sub-Adviser Agreement in
          substantially the form attached hereto as Exhibit A (the "Sub-Adviser
          Agreement"), the obligation of the Adviser under this Agreement with
          respect to managing the investment portfolio of such Fund shall be,
          subject in any event to the control of the Trustees, to determine and
          review with such Sub-Adviser the investment objectives, policies and
          restrictions and placing of all orders for the purchase and sale of
          portfolio securities for such Fund, all as further described in the
          Sub-Adviser Agreement. The Adviser will compensate any Sub-Adviser of
          any Fund for its services to such Fund. The Adviser may terminate the
          services of any Sub-Adviser at any time, subject to the approval of
          the Trustees, and shall at such time assume the responsibilities of
          such Sub-Adviser unless and until a successor Sub-Adviser is selected.

3.   Management Services. The Adviser will perform (or arrange for the
     -------------------
     performance by its affiliates) the management and administrative services
     necessary for the operation of the Trust.

     A.   Subject to the supervision of the Trustees, and unless otherwise
          provided herein the Adviser shall be responsible for the day to day
          business activities of the Trust and shall perform all services
          appropriate thereto, including: (i) providing for members of its
          organization to serve without salaries as Trustees, officers, or
          agents of the Trust; (ii) furnishing at its expense such office space
          as may be necessary for the suitable conduct of the Trust's business
          (other than pricing and bookkeeping) and all necessary light, heat,
          telephone service, office equipment stationery, and stenographic,
          clerical, mailing and messenger service in

                                       2
<PAGE>

          connection with such office; (iii) on behalf of the Funds of the
          Trust, supervising relations with, and monitoring the performance of,
          custodians, depositories, transfer and pricing agents, accountants,
          attorneys, underwriters, brokers and dealers, insurers and other
          persons in any capacity deemed to be necessary or desirable; (iv)
          preparing all general shareholder communications, including
          shareholder reports; (v) conducting shareholder relations; (vi)
          maintaining the Trust's existence and its records; (vii) during such
          times as shares are publicly offered, maintaining the registration and
          qualification of the Trust's shares under federal and state law; and
          (viii) investigating the development of management and shareholder
          services (and, if appropriate, assisting in the development and
          implementation of such services) designed to enhance the value or
          convenience of the Funds of the Trust as investment vehicles.

     B.   The Adviser shall also furnish such reports, evaluations, information
          or analyses to the Trust as the Trustees may request from time to time
          or as the Adviser may deem to be desirable. The Adviser shall make
          recommendations to the Trustees with respect to Fund policies, and
          shall carry out such policies as are adopted by the Trustees. The
          Adviser shall, subject to review by the Trustees, furnish such other
          services as the Adviser shall from time to time determine to be
          necessary or useful to perform its obligations under this Agreement.
          Should the Trust have occasion to call upon the Adviser for services
          not herein contemplated or through the Adviser to arrange for the
          services of others, the Adviser will act for the Trust upon request to
          the best of its ability, the compensation for its services to be
          agreed upon with respect to each such occasion as it arises.

     C.   The Adviser will not furnish the Trust the following services under
          this Agreement:

          (i)    determinations of the Trust's net assets and the net asset
                 value per share of its shares ("pricing");

          (ii)   maintenance of accounts, books and records as required by
                 Section 31(a) of the 1940 Act and the rules thereunder
                 ("bookkeeping"); and

          (iii)  provision of custodian services, transfer agent services,
                 dividend disbursement and reinvestment services, shareholder
                 services, or shareholder recordkeeping services.

4.   Expenses of the Trust. It is understood that the Trust will pay all its
     ---------------------
     expenses other than those expressly stated to be payable by the Adviser
     hereunder. The expenses payable by the Trust shall include, without
     limitation; (i) interest and taxes; (ii) brokerage commissions and other
     costs in connection with the purchase or sale of securities and other
     investment instruments; (iii) fees and expenses associated with pricing and
     bookkeeping;. (iv) fees and expenses of its Trustees other than those who
     are "interested

                                       3
<PAGE>

     persons" of the Trust or the Adviser; (v) legal and audit expenses; (vi)
     custodian, registrar and transfer agent fees and expenses; (vii) fees and
     expenses related to the registration and qualification of the Trust and the
     Fund's shares for distribution under state and federal securities laws;
     (viii) expenses of printing and mailing reports and notices and proxy
     material to shareholders of the Funds; (ix) all other expenses incidental
     to holding meetings of the Trust's shareholders, including proxy
     solicitations therefor; (x) insurance premiums for fidelity and other
     coverage; (xi) its proportionate share of association membership dues;
     (xii) expenses of typesetting for printing Prospectuses and Statements of
     Additional Information and supplements thereto; (xiii) expenses of printing
     and mailing Prospectuses and Statements of Additional Information and
     supplements thereto sent to existing shareholders: and (ix) such non-
     recurring or extraordinary expenses as may arise, including those relating
     to actions, suits or proceedings to which the Trust is a party and the
     legal obligation which the Trust may have to indemnify the Trust's Trustees
     and officers with respect thereto.

5.   Compensation. As full compensation for the services furnished and expenses
     ------------
     borne by the Adviser herein, the Trust will pay a monthly fee to the
     Adviser, computed and paid monthly at an annual rate of the average daily
     net assets of each Fund, as described in Schedule B which is attached
     hereto.

     The fee computed with respect to the net assets of each Fund shall be paid
     from the assets of such Fund. The average daily net assets of each Fund
     shall be determined by taking an average of all of the determinations of
     net asset value during each month at the close of business on each business
     day during such month while this Agreement is in effect. The fee for each
     month shall be payable within five (5) business days after the end of the
     month.

     In the event that expenses of any Fund for any fiscal year should exceed
     the expense limitation on investment company expenses imposed by any
     statute or regulatory authority of any jurisdiction in which shares of the
     Fund are then qualified for offer and sale, the compensation due the
     Adviser such period shall be reduced by the amount of such excess by a
     reduction or refund thereof, subject to readjustment during the Fund's
     fiscal year. In the event that the expenses with respect to any Fund should
     exceed any expense limitation which the Adviser may, by written notice to
     the Trust, voluntarily declare to be effective, subject to such terms and
     conditions as the Adviser may prescribe in the notice, the compensation due
     the Adviser shall be reduced, and, if necessary, the Adviser shall bear
     expenses with respect to the Fund, to the extent required by the expense
     limitation.

     If the Adviser shall serve for any period less than a full month, the
     foregoing compensation shall be prorated according to the proportion which
     such period bears to a full month.

                                       4
<PAGE>

     In addition to the foregoing, the Trust will reimburse the Adviser for the
     traveling and incidental expenses (other than the regular Worcester office
     expenses described above) which may be incurred in connection with special
     work performed at its request.

6.   Limitation of Liability. The Adviser shall be under no liability to the
     -----------------------
     Trust or its Shareholders or creditors for any matter or thing in
     connection with the performance of any of the Adviser's services hereunder
     or for any losses sustained or that may be sustained in the purchase, sale
     or retention of any investment for the Funds of the Trust made by it in
     good faith; provided, however, that nothing herein contained shall be
     construed to protect the Adviser against any liability to the Trust by
     reason of the Adviser's own willful misfeasance, bad faith, or gross
     negligence in the performance of its duties or by reason of its reckless
     disregard of its obligations and duties hereunder.

7.   Amendment. This Agreement may be amended at any time by mutual consent of
     ---------
     the parties, provided that such amendment shall have been approved (i) by
     vote of a majority of the outstanding voting securities of each Fund
     affected by such amendment, and (ii) by vote of a majority of the Trustees
     of the Trust who are not interested persons of the Adviser or any Sub-
     Adviser or of the Trust, cast in person at a meeting called for the purpose
     of voting on such approval.

8.   Termination. This Agreement shall be effective as of the date executed, and
     -----------
     shall remain in full force and effect as to each Fund continuously
     thereafter, until terminated as provided below.

     A.  Unless terminated as herein provided, this Agreement shall remain in
         full force and effect through May 30, 1998, and shall continue in full
         force and effect for successive periods of one year thereafter, but
         only so long as each such continuance is approved (i) by the Trustees
         or by the affirmative vote of a majority of the outstanding voting
         securities of a Fund, and (ii) by a vote of a majority of the Trustees
         who are not interested persons of the Trust or of the Adviser or of any
         Sub-Adviser, by vote cast in person at a meeting called for the purpose
         of voting on such approval; provided, however, that if the continuance
         of this Agreement is submitted to the shareholders of a Fund for their
         approval and such shareholders fail to approve such continuance of this
         Agreement as provided herein, the Adviser may continue to serve
         hereunder in a manner consistent with the 1940 Act and the rules and
         regulations thereunder.

     B.  This Agreement may be terminated as to any Fund without the payment of
         any penalty by vote of the Trustees or by vote of a majority of the
         outstanding voting securities of such Fund at any annual or special
         meeting or by the Adviser on sixty days' written notice.


     C.  This Agreement shall automatically terminate in the event of its
         assignment.

                                       5
<PAGE>

9.   Agreement and Declaration of Trust. A copy of the Trust's Agreement and
     ----------------------------------
     Declaration is on file with the Secretary of State of the Commonwealth of
     Massachusetts, and notice is hereby given that this instrument is executed
     by the Trustees as Trustees and not individually, and that the obligations
     of this instrument are not binding upon any of the Trustees, officers or
     shareholders individually but are binding only upon the assets and property
     of the Trust.

10.  Other Agreements, etc. It is understood that any of the shareholders,
     ---------------------
     Trustees, officers and employees of the Trust may be a shareholder,
     partner, director, officer or employee of, or be otherwise interested in,
     the Adviser, and in any person controlled by or under common control with
     the Adviser, and that the Adviser and any person controlled by or under
     common control with the Adviser may have an interest in the Trust. It is
     also understood that the Adviser and persons controlled by or under common
     control with the Adviser have and may have advisory, management service or
     other contracts with other organizations and persons, and may have other
     interests and businesses.

11.  Miscellaneous. The Adviser, its directors, officers, and its employees
     -------------
     retain the right to engage in other business, and to render portfolio
     management, investment advisory, or other services of any kind to any other
     corporation, firm, individual, or association. Neither the Adviser nor any
     officer, director, or shareholder of the Adviser shall act as principal or
     receive any compensation in connection with the purchase or sale of
     securities by or on behalf of the Trust other than the compensation
     provided in this Agreement.

     The Adviser is an independent contractor and not an agent of the Trust.

     The Trust recognizes the Adviser's control of the names "SMA Investment
     Trust" and "Allmerica Investment Trust" and agrees that its right to use
     such names is non-exclusive and can be terminated by the Adviser at any
     time. The use of such names will be terminated automatically if at any time
     the Adviser or affiliate of the Adviser ceases to be investment adviser for
     the Trust.

     For the purposes of this Agreement, majority of the outstanding voting
     securities of a Fund at any annual or special meeting shall mean a
     concurring vote of (i) 67% or more of the shares of the Fund represented at
     such meeting, if more than 50% of the outstanding shares of the Fund are
     represented in person or by proxy, or (ii) 50% of the outstanding shares of
     the Fund, whichever is less.

     For the purposes of this Agreement, the terms "interested person" and
     "assignment" shall have their respective meanings defined in the 1940 Act,
     subject, however, to such exemptions as may be granted by the SEC under
     said Act; the term "specifically approve at least annually" shall be
     construed in a manner consistent with the 1940 Act and the rules and
     regulations thereunder; and the term "brokerage and research services"
     shall

                                       6
<PAGE>

     have the meaning given in the Securities Exchange Act of 1934 and the rules
     and regulations thereunder.

     Each party hereto shall cooperate with each other party and all appropriate
     governmental authorities (including without limitation the Securities and
     Exchange Commission, the NASD and State insurance regulators) and shall
     permit such authorities reasonable access to its books and records in
     connection with any investigation or inquiry relating to this Agreement or
     the transactions contemplated hereby.

     Notwithstanding the generality of the foregoing, each party hereto further
     agrees to furnish the California Insurance Commissioner, or the Insurance
     Commissioner of any other state, with any information or reports in
     connection with services provided under this Agreement which such
     Commissioner may reasonably request in order to ascertain whether the
     variable contracts operations of the Company are being conducted in a
     manner consistent with the state's regulations concerning variable
     contracts and any other applicable law or regulations.

     This Agreement shall be effective on the date executed. Executed this 16th
     day of April, 1998.

                              ALLMERICA FINANCIAL INVESTMENT
                              MANAGEMENT SERVICES, INC.


/s/ Julia Fletcher              By:  /s/ Richard M. Reilly
- -------------------------            ---------------------------------
Witness

                              ALLMERICA INVESTMENT TRUST


/s/ Julia Fletcher              By:  /s/ Thomas P. Cunningham
- -------------------------            ---------------------------------
Witness

                                       7
<PAGE>

                                   SCHEDULE A
                         SERIES OF SHARES OF THE TRUST
                          as of Effective May 1, 2000


                          Select Emerging Markets Fund
                         Select Aggressive Growth Fund
                        Select Capital Appreciation Fund
                         Select Value Opportunity Fund
                        Select International Equity Fund
                               Select Growth Fund
                          Select Strategic Growth Fund
                                Core Equity Fund
                               Equity Index Fund
                         Select Growth and Income Fund
                      Select Investment Grade Income Fund
                              Government Bond Fund
                               Money Market Fund

                                       8
<PAGE>

                                   SCHEDULE B
                                  COMPENSATION
                       Effective as of September 1, 1999



As full compensation for the services furnished and expenses borne by the
Adviser herein, the Trust will pay a monthly fee to the Adviser, computed and
paid monthly at an annual rate of the average daily net assets of each Fund, as
described below:
<TABLE>
<CAPTION>
                                Select         Select     Select Capital   Select Value       Select      Select
                               Emerging      Aggressive    Appreciation     Opportunity   International   Growth
                             Markets Fund   Growth Fund        Fund            Fund        Equity Fund     Fund
                             -------------  ------------  ---------------  -------------  --------------  -------
<S>                          <C>            <C>           <C>              <C>            <C>             <C>

  Manager Fee                    1.35%           (1)            (1)             (2)             (1)         (2)
<CAPTION>

                               Select
                             Strategic                    Equity       Select Growth      Select        Investment
                               Growth       Growth         Index          and Income       Income       Grade Income
                                Fund         Fund           Fund             Fund           Fund            Fund
                             -----------  ------------   -----------   --------------   ------------   -------------
<S>                          <C>          <C>            <C>           <C>              <C>            <C>
  Manager Fee                   0.85%           (1)          (3)              (1)            (4)             (4)

<CAPTION>
                             Government         Money
                                Bond            Market
                                Fund            Fund
                                ----            ----
<S>                          <C>          <C>
  Manager Fee                   0.50%            (3)
</TABLE>


- --------------------------------------------------------------------------------


(1) The Manager's fees for the Select Aggressive Growth Fund, Select Capital
    Appreciation Fund, Select International Equity Fund, Growth Fund and
    Select Growth and Income Fund, computed daily at an annual rate based on the
    average daily net assets of each Fund, are based on the following schedule:

<TABLE>
<CAPTION>

                                                                                Select                         Select Growth
                                       Select Aggressive   Select Capital    International       Growth          and Income
Assets                                    Growth Fund    Appreciation Fund    Equity Fund         Fund              Fund
- ------                                    -----------    -----------------    -----------      -----------          ----
<S>                                    <C>               <C>                 <C>               <C>             <C>
First $100 Million ..........                1.00%             1.00%             1.00%             0.60%           0.75%
$100 to $250 Million ........                0.90%             0.90%             0.90%             0.60%           0.70%
$250 to $500 Million ........                0.80%             0.80%             0.85%             0.40%           0.65%
$500 to $1 Billion ..........                0.70%             0.70%             0.85%             0.35%           0.65%
Over $1 Billion .............                0.65%             0.65%             0.85%             0.35%           0.65%
</TABLE>

                                       9
<PAGE>

(2)  The Manager's fee for the Select Value Opportunity Fund and Select Growth
     Fund, computed daily at an annual rate based on the average daily net
     assets of the Fund, is based on the following schedule:

                                              Select
                                              Value            Select
                                           Opportunity         Growth
        Assets                                 Fund             Fund
        ------                                 ----             ----
        First $100 Million ...............     1.00%            0.85%
        Next $150 Million ................     0.85%            0.85%
        Next $250 Million ................     0.80%            0.80%
        Next $250 Million ................     0.75%            0.75%
        Over $750 Million ................     0.70%            0.70%

(3)  The Manager's fees for the Equity Index Fund and Money Market Fund,
     computed daily at an annual rate based on the average daily net assets of
     each Fund, are based on the following schedule:

                                              Equity            Money
                                              Index            Market
        Assets                                 Fund             Fund
        ------                                 ----             ----
        First $50 Million ................     0.35%            0.35%
        Next $200 Million ................     0.30%            0.25%
        Over $250 Million ................     0.25%            0.20%

(4)  The Manager's fees for the Investment Grade Income Fund, computed daily at
     an annual rate based on the average daily net assets of each Fund, are
     based on the following schedule:

                                             Investment
                                               Grade
        Assets                              Income Fund
        ------                              -----------
        First $50 Million ................     0.50%
        Next $50 Million .................     0.45%
        Over $100 Million ................     0.40%

                                       10
<PAGE>

                                   EXHIBIT A

                                    FORM OF
                             SUB-ADVISER AGREEMENT


  SUB-ADVISER AGREEMENT executed as of ________________,1998 between Allmerica
Financial Investment Management Services, Inc. (the "Manager") and
__________________________________ (the "Sub-Adviser").

Witnesseth:

That in consideration of the mutual covenants herein contained, it is agreed as
follows:

1.  SERVICES TO BE RENDERED BY SUB-ADVISER TO THE TRUST

  (a) Subject always to the control of the Trustees of Allmerica Investment
      Trust (the "Trust"), a Massachusetts business trust, the Sub-Adviser, at
      its expense, will furnish continuously an investment program for the
      following series of shares of the Trust:  the
      _______________________________ (the "Fund") and such other series of
      shares as the Trust, the Manager and the Sub-Adviser may from time to time
      agree on (together, the "Funds"). The Sub-Adviser will make investment
      decisions on behalf of the Fund and place all orders for the purchase and
      sale of portfolio securities.  In the performance of its duties, the Sub-
      Adviser will comply with the provisions of the Agreement and Declaration
      of Trust and Bylaws of the Trust and the objectives and policies of the
      Fund, as set forth in the current Registration Statement of the Trust
      filed with the Securities and Exchange Commission ("SEC") and any
      applicable federal and state laws, and will comply with other policies
      which the Trustees of the Trust (the "Trustees") or the Manager, as the
      case may be, may from time to time determine and which are furnished to
      the Sub-Adviser. The Sub-Adviser shall make its officers and employees
      available to the Manager from time to time at reasonable times to review
      investment policies of the Fund and to consult with the Manager regarding
      the investment affairs of the Fund. In the performance of its duties
      hereunder, the Sub-Adviser is and shall be an independent contractor and,
      unless otherwise expressly provided or authorized, shall have no authority
      to act for or represent the Trust in any way or otherwise be deemed to be
      an agent of the Trust.

  (b) The Sub-Adviser, at its expense, will furnish (i) all investment and
      management facilities, including salaries of personnel necessary for it to
      perform the duties set forth in this Agreement, and (ii) administrative
      facilities, including clerical personnel and equipment necessary for the
      conduct of the investment affairs of the Fund (excluding brokerage
      expenses and pricing and bookkeeping services).

                                       11
<PAGE>

  (c) The Sub-Adviser shall place all orders for the purchase and sale of
      portfolio investments for the Fund with issuers, brokers or dealers
      selected by the Sub-Adviser which may include brokers or dealers
      affiliated with the Sub-Adviser. In the selection of such brokers or
      dealers and the placing of such orders, the Sub-Adviser always shall seek
      best execution (except to the extent permitted by the next sentence
      hereof), which is to place portfolio transactions where the Fund can
      obtain the most favorable combination of price and execution services in
      particular transactions or provided on a continuing basis by a broker or
      dealer, and to deal directly with a principal market maker in connection
      with over-the-counter transactions, except when it is believed that best
      execution is obtainable elsewhere. Subject to such policies as the
      Trustees may determine, the Sub-Adviser shall not be deemed to have acted
      unlawfully or to have breached any duty created by this Agreement or
      otherwise solely by reason of its having caused the Trust to pay a broker
      or dealer that provides brokerage and research services an amount of
      commission for effecting a portfolio investment transaction in excess of
      the amount of commission another broker or dealer would have charged for
      effecting that transaction, if the Sub-Adviser determines in good faith
      that such excess amount of commission was reasonable in relation to the
      value of the brokerage and research services provided by such broker or
      dealer, viewed in terms of either that particular transaction or the
      overall responsibilities of the Sub-Adviser and its affiliates with
      respect to the Trust and to other clients of the Sub-Adviser as to which
      Sub-Adviser or any affiliate of the Sub-Adviser exercises investment
      discretion.

2.   OTHER AGREEMENTS

     It is understood that any of the shareholders, Trustees, officers and
  employees of the Trust may be a shareholder, partner, director, officer or
  employee of, or be otherwise interested in, the Sub-Adviser, and in any person
  controlled by or under common control with the Sub-Adviser, and that the Sub-
  Adviser and any person controlled by or under common control with the Sub-
  Adviser may have an interest in the Trust. It is also understood that the Sub-
  Adviser and persons controlled by or under common control with the Sub-Adviser
  have and may have advisory, management service or other contracts with other
  organizations and persons, and may have other interests and businesses.

3.  COMPENSATION TO BE PAID BY THE MANAGER TO THE SUB-ADVISER

     The Manager will pay to the Sub-Adviser as compensation for the Sub-
  Adviser's services rendered a fee, determined as described in Schedule A which
  is attached hereto and made a part hereof. Such fee shall be paid by the
  Manager and not by the Trust.

4.  AMENDMENTS OF THIS AGREEMENT

     This Agreement (including Schedule A attached hereto) shall not be amended
  as to any

                                       12
<PAGE>

  Fund unless such amendment is approved at a meeting by the affirmative vote of
  a majority of the outstanding voting securities of the Fund, if such approval
  is required under the Investment Company Act of 1940, as amended ("1940 Act"),
  and by the vote, cast in person at a meeting called for the purpose of voting
  on such approval, of a majority of the Trustees who are not interested persons
  of the Trust or of the Manager or of the Sub-Adviser.

5.  EFFECTIVE PERIOD AND TERMINATION OF THIS AGREEMENT

     This Agreement shall be effective as of the date executed, and shall remain
  in full force and effect as to each Fund continuously thereafter, until
  terminated as provided below:

  (a) Unless terminated as herein provided, this Agreement shall remain in full
      force and effect through _______________ and shall continue in full force
      and effect for successive periods of one year thereafter, but only so long
      as such continuance is specifically approved at least annually (i) by the
      Trustees or by the affirmative vote of a majority of the outstanding
      voting securities of the Fund, and (ii) by a vote of a majority of the
      Trustees who are not interested persons of the Trust or of the Manager or
      of any Sub-Adviser, by vote cast in person at a meeting called for the
      purpose of voting on such approval; provided, however, that if the
      continuance of this Agreement is submitted to the shareholders of the Fund
      for their approval and such shareholders fail to approve such continuance
      of this Agreement as provided herein, the Sub-Adviser may continue to
      serve hereunder in a manner consistent with the 1940 Act and the rules and
      regulations thereunder.

  (b) This Agreement may be terminated as to any Fund without the payment of any
      penalty by the Manager, subject to the approval of the Trustees, by vote
      of the Trustees, or by vote of a majority of the outstanding voting
      securities of such Fund at any annual or special meeting or by the Sub-
      Adviser, in each case on sixty days' written notice.

  (c) This Agreement shall terminate automatically, without the payment of any
      penalty, in the event of its assignment or in the event that the
      Management Agreement with the Manager shall have terminated for any
      reason.

  (d) In the event of termination of this Agreement, the Fund will no longer use
      the name "______________" or "_________________" in materials relating to
      the Fund except as may be required by the 1940 Act and the rules and
      regulations thereunder.

6. CERTAIN DEFINITIONS

     For the purposes of this Agreement, the "affirmative vote of a majority of
  the outstanding voting securities" means the affirmative vote, at a duly
  called and held meeting of shareholders, (a) of the holders of 67% or more of
  the shares of the Fund present (in person or by proxy) and entitled to vote at
  such meeting, if the holders of more than 50% of the outstanding shares of the
  Fund entitled to vote at such meeting are present in person or by

                                       13
<PAGE>

  proxy, or (b) of the holders of more than 50% of the outstanding shares of the
  Fund entitled to vote at such meeting, whichever is less.

     For the purposes of this Agreement, the terms "control", "interested
  person" and "assignment" shall have their respective meanings defined in the
  1940 Act and rules and regulations thereunder, subject, however, to such
  exemptions as may be granted by the SEC under said Act; the term "specifically
  approve at least annually" shall be construed in a manner consistent with the
  1940 Act and the rules and regulations thereunder; and the term "brokerage and
  research services" shall have the meaning given in the Securities Exchange Act
  of 1934 and the rules and regulations thereunder.

7.  NON-LIABILITY OF SUB-ADVISER

     The Sub-Adviser shall be under no liability to the Trust, the Manager or
  the Trust' s Shareholders or creditors for any matter or thing in connection
  with the performance of any of the Sub-Adviser's services hereunder or for any
  losses sustained or that may be sustained in the purchase, sale or retention
  of any investment for the Funds of the Trust made by it in good faith;
  provided, however, that nothing herein contained shall be construed to protect
  the Sub-Adviser against any liability to the Trust by reason of the Sub-
  Adviser's own willful misfeasance, bad faith or gross negligence in the
  performance of its duties or by reason of its reckless disregard of its
  obligations and duties hereunder.

8.  LIMITATIONS OF LIABILITY OF THE TRUSTEES AND SHAREHOLDERS

     A copy of the Trust's Agreement and Declaration of Trust is on file with
  the Secretary of the Commonwealth of Massachusetts, and notice is hereby given
  that this instrument is executed by the Trustees as Trustees and not
  individually and that the obligations of this instrument are not binding upon
  any of the Trustees, officers or shareholders individually but are binding
  only upon the assets and property of the appropriate Fund.

                                       14
<PAGE>

IN WITNESS WHEREOF, ALLMERICA FINANCIAL INVESTMENT MANAGEMENT SERVICES, INC. has
caused this instrument to be signed in duplicate on its behalf by its duly
authorized representative and ___________________________ has caused this
instrument to be signed in duplicate on its behalf by its duly authorized
representative, all as of the day and year first above written.


ALLMERICA FINANCIAL INVESTMENT
MANAGEMENT SERVICES, INC.


By:
     --------------------------------------

Its:
     --------------------------------------



(NAME OF SUB-ADVISER)


By:
     --------------------------------------


Its:
     --------------------------------------



Accepted and Agreed to as of the day and year first above written:


ALLMERICA INVESTMENT TRUST

By:
     --------------------------------------


Its:
     --------------------------------------

                                       15
<PAGE>

                                   SCHEDULE A
                                   ----------


  The Manager will pay to the Sub-Adviser as full compensation for the Sub-
Adviser's services rendered, a fee computed daily and paid quarterly at an
annual rate of the average daily net assets of the Fund as described below:

          NET ASSETS                          FEE RATE
          ----------                          --------




  The average daily net assets of the Fund shall be determined by taking an
average of all of the determinations of net asset during each month at the close
of business on each business day during such month while this Agreement is in
effect.

  The fee for each quarter shall be payable within ten (10) business days after
the end of the quarter.

  If the Sub-Adviser shall serve for any period less than a full month, the
foregoing compensation shall be prorated according to the proportion which such
period bears to a full month.

                                       16

<PAGE>

                                                                    Exhibit 4(c)

                             SUB-ADVISER AGREEMENT

SUB-ADVISER AGREEMENT executed as of April 16, 1998 between ALLMERICA FINANCIAL
INVESTMENT MANAGEMENT SERVICES, INC. (the "Manager"), and NICHOLAS-APPLEGATE
CAPITAL MANAGEMENT (the "Sub-Adviser").

WITNESSETH:

That in consideration of the mutual covenants herein contained, it is agreed as
follows:

1. SERVICES TO BE RENDERED BY SUB-ADVISER TO THE TRUST

   (a) Subject always to the control of the Trustees of Allmerica Investment
Trust (the "Trust"), a Massachusetts business trust, the Sub-Adviser, at its
expense, will furnish continuously an investment program for each of the
following series of shares of the Trust: Select Aggressive Growth Fund and such
other series of shares as the Trust, the Manager and the Sub-Adviser may from
time to time agree on (together, the "Funds").  The Sub-Adviser will make
investment decisions on behalf of each of the Funds and place all orders for the
purchase and sale of portfolio securities.  In the performance of its duties,
the Sub-Adviser will comply with the provisions of the Agreement and Declaration
of Trust and Bylaws of the Trust and the objectives and policies of each of the
Funds, as set forth in the current Registration Statement of the Trust filed
with the Securities and Exchange Commission and any applicable federal and state
laws, and will comply with other policies which the Trustees of the Trust (the
"Trustees") or the Manager, as the case may be, may from time to time determine
in writing.  The Sub-Adviser shall make its officers and employees available to
the Manager from time to time at reasonable times to review investment policies
of the Funds and to consult with the Manager regarding the investment affairs of
the Funds.

   (b) The Sub-Adviser, at its expense, will furnish (i) all necessary
investment and management facilities, including salaries of personnel required
for it to execute its duties faithfully, and (ii) administrative facilities,
including clerical personnel and equipment necessary for the efficient conduct
of the investment affairs of each of the Funds (excluding pricing and
bookkeeping services).

   (c) The Sub-Adviser shall place all orders for the purchase and sale of
portfolio investments for each Fund with issuers, brokers or dealers selected by
the Sub-Adviser which may include brokers or dealers affiliated with the Sub-
Adviser.  In the selection of such brokers or dealers and the placing of such
orders, the Sub-Adviser always shall seek best execution, (except to the extent
permitted by the next sentence hereof) which is to place portfolio transactions
where each Fund can obtain the most favorable combination of price and execution
services in particular transactions or provided on a continuing basis by a
broker or dealer, and to deal directly with a principal market maker in
connection with over-the-counter transactions, except when it is believed that
best execution is obtainable elsewhere.  Subject to such policies as the
Trustees may determine, the Sub-Adviser shall not be deemed to have acted
unlawfully or to have breached any duty created by this Agreement or otherwise
solely by reason of its having caused the Trust to pay
<PAGE>

a broker or dealer that provides brokerage and research services an amount of
commission for effecting a portfolio investment transaction in excess of the
amount of commission another broker or dealer would have charged for effecting
that transaction, if the Sub-Adviser determines in good faith that such excess
amount of commission was reasonable in relation to the value of the brokerage
and research services provided by such broker or dealer, viewed in terms of
either that particular transaction or the overall responsibilities of the Sub-
Adviser and its affiliates with respect to the Trust and to other clients of the
Sub-Adviser as to which Sub-Adviser or any affiliate of the Sub-Adviser
exercises investment discretion.

     (d) The Sub-Adviser shall not be obligated to pay any expenses of or for a
Fund not expressly assumed by the Sub-Adviser pursuant to this Section 1.

2.   OTHER AGREEMENTS, ETC.

    It is understood that any of the shareholders, Trustees, officers and
employees of the Trust may be a shareholder, partner, director, officer or
employee of, or be otherwise interested in, the Sub-Adviser, and in any person
controlled by or under common control with the Sub-Adviser, and that the Sub-
Adviser and any person controlled by or under common control with the Sub-
Adviser may have an interest in the Trust.  It is also understood that the Sub-
Adviser and persons controlled by or under common control with the Sub-Adviser
have and may have advisory, management service or other contracts with other
organizations and persons, and may have other interests and businesses.

3.   COMPENSATION TO BE PAID BY THE MANAGER TO THE SUB-ADVISER

    The Manager will pay to the Sub-Adviser as compensation for the Sub-
Adviser's services rendered and for the expenses borne by the Sub-Adviser
pursuant to Section 1, a fee, determined as described in Schedule A which is
attached hereto and made a part hereof. Such fee shall be paid by the Manager
and not by the Trust.

4.   AMENDMENTS OF THIS AGREEMENT

    This Agreement (including Schedule A hereto) shall not be amended as to any
Fund unless such amendment is approved at a meeting by the affirmative vote of a
majority of the outstanding voting securities of the Fund, and by the vote, cast
in person at a meeting called for the purpose of voting on such approval, of a
majority of the Trustees who are not interested persons of the Trust or of the
Manager or of the Sub-Adviser.

5.   EFFECTIVE PERIOD AND TERMINATION OF THIS AGREEMENT

    This Agreement shall be effective as of the date executed, and shall remain
in full force and effect as to each Fund continuously thereafter, until
terminated as provided below.

    A. Unless terminated as herein provided, this Agreement shall remain in full
       force and effect

                                       2
<PAGE>

       through May 30, 1998, and shall continue in full force and effect for
       successive periods of one year thereafter, but only so long as each such
       continuance is approved annually (i) by the Trustees or by the
       affirmative vote of a majority of the outstanding voting securities of a
       Fund, and (ii) by a vote of a majority of the Trustees who are not
       interested persons of the Trust or of the Manager or of any Sub-Adviser,
       by vote cast in person at a meeting called for the purpose of voting on
       such approval; provided, however, that if the continuance of this
       Agreement is submitted to the shareholders of a Fund for their approval
       and such shareholders fail to approve such continuance of this Agreement
       as provided herein, the Sub-Adviser may continue to serve hereunder in a
       manner consistent with the Investment Company Act of 1940, as amended
       ("1940 Act") and the rules and regulations thereunder.

    B. This Agreement may be terminated as to any Fund without the payment of
       any penalty by the Manager, subject to the approval of the Trustees, by
       vote of the Trustees, or by vote of a majority of the outstanding voting
       securities of such Fund at any annual or special meeting or by the Sub-
       Adviser on sixty days' written notice.

    C. This Agreement shall terminate automatically, without the payment of any
       penalty, in the event of its assignment or in the event that the
       Management Agreement shall have terminated for any reason.

6.   CERTAIN DEFINITIONS

    For the purposes of this Agreement, the "affirmative vote of a majority of
the outstanding voting securities" means the affirmative vote, at a duly called
and held meeting of shareholders, (a) of the holders of 67% or more of the
shares of a Fund present (in person or by proxy) and entitled to vote at such
meeting, if the holders of more than 50% of the outstanding shares of the Fund
entitled to vote at such meeting are present in person or by proxy, or (b) of
the holders of more than 50% of the outstanding shares of the Fund entitled to
vote at such meeting, whichever is less.

    For the purposes of this Agreement, the terms "control", "interested person"
and "assignment" shall have their respective meanings defined in the 1940 Act
and the Rules and Regulations thereunder, subject, however, to such exemptions
as may be granted by the Securities and Exchange Commission under said Act; the
term "specifically approve at least annually" shall be construed in a manner
consistent with the 1940 Act and the Rules and Regulations thereunder; and the
term "brokerage and research services" shall have the meaning given in the
Securities and Exchange Act of 1934 and the Rules and Regulations thereunder.

7.   NONLIABILITY OF SUB-ADVISER

    In the absence of willful misfeasance, bad faith or gross negligence on the
part of the Sub-Adviser, or reckless disregard of its obligations and duties
hereunder, the Sub-Adviser shall not be subject to any liability to the Trust,
to any shareholder of the Trust or to the Manager, for any act or omission in
the course of, or connected with, rendering services hereunder.

                                       3
<PAGE>

8.   LIMITATIONS OF LIABILITY OF THE TRUSTEES AND SHAREHOLDERS

    A copy of the Trust's Agreement and Declaration of Trust is on file with the
Secretary of the Commonwealth of Massachusetts, and notice is hereby given that
this instrument is executed by the Trustees as Trustees and not individually and
that the obligations of this instrument are not binding upon any of the
Trustees, officers or shareholders individually but are binding only upon the
assets and property of the appropriate Fund.

9.   MISCELLANEOUS

     A. The Sub-Adviser shall be responsible for voting the securities of the
        Funds.

     B. Any notices from the Sub-Adviser to the Manager shall be mailed to the
        following address:

                  Allmerica Financial Investment Management Services, Inc.
                  440 Lincoln Street
                  Worcester MA 01653
                  Attn: Counsel


       Any notices from the Manager to the Sub-Adviser shall be mailed to the
following address:

                  Nicholas-Applegate Capital Management, L.P.
                  501 West Broadway, Suite 2000
                  San Diego CA 92101
                  Attn:  Antonio C. Cabral, Jr.
                  Vice President

     C. It is understood that this Agreement shall be governed by and construed
        under and in accordance with the laws of the Commonwealth of
        Massachusetts laws except when Federal securities laws or other Federal
        laws are applicable.

                                       4
<PAGE>

IN WITNESS WHEREOF, ALLMERICA FINANCIAL INVESTMENT MANAGEMENT SERVICES, INC. has
caused this instrument to be signed in duplicate on its behalf by its duly
authorized representative and NICHOLAS-APPLEGATE CAPITAL MANAGEMENT has caused
this instrument to be signed in duplicate on its behalf by its duly authorized
representative, all as of the day and year first above written.

                         ALLMERICA FINANCIAL INVESTMENT
                         MANAGEMENT SERVICES, INC.


                         By:  /s/ Richard M. Reilly
                              ---------------------

                         Title:  President
                                 ------------------


                         NICHOLAS-APPLEGATE CAPITAL MANAGEMENT


                         By:  /s/ E. Blake Moore, Jr.
                              -----------------------

                         Title:  General Counsel
                                 --------------------



Accepted and Agreed to as of the day and year first above written:


ALLMERICA INVESTMENT TRUST


By:  /s/ Thomas P. Cunningham
     ------------------------------

Title:  Vice President & Treasurer
        ---------------------------

                                       5
<PAGE>

                                  SCHEDULE A
                                  ----------

                          Effective September 1, 1999

The Manager will pay to the Sub-Adviser as compensation for the Sub-Advisers
services rendered and for the expenses borne by the Sub-Adviser pursuant to
Section 1, a fee, computed daily at an annual rate based on the average daily
net assets of each Fund (valued in accordance with the current Registration
Statement of the Fund), as set forth below:

     Fund                             Net Assets         Fee Rate
     ----                             ----------         --------

     Select Aggressive Growth Fund    First $100 million   0.60%
                                      Next $150 million    0.50%
                                      Next $250 million    0.40%
                                      Next $250 million    0.375%
                                      Over $750 million    0.35%

     Such fee will be paid to the Sub-Adviser after the end of each calendar
quarter.

                                       6

<PAGE>

                                    FORM OF                         Exhibit 4(h)

                             SUB-ADVISER AGREEMENT

SUB-ADVISER AGREEMENT executed as of April 1, 2000 between Allmerica
Financial Investment Management Services, Inc. (the "Manager") and TCW
Investment Management Company (the "Sub-Adviser").

WITNESSETH:

That in consideration of the mutual covenants herein contained, it is agreed as
follows:

1.  SERVICES TO BE RENDERED BY SUB-ADVISER TO THE TRUST

    (a) Subject always to the control of the Trustees of Allmerica Investment
        Trust (the "Trust"), a Massachusetts business trust, the Sub-Adviser, at
        its expense, will furnish continuously an investment program for the
        following series of shares of the Trust: the Select Strategic Growth
        Fund (the "Fund") and such other series of shares as the Trust, the
        Manager and the Sub-Adviser may from time to time agree on (together,
        the "Funds"). The Sub-Adviser will make investment decisions on behalf
        of the Fund and place all orders for the purchase and sale of portfolio
        securities. In the performance of its duties, the Sub-Adviser will
        comply with the provisions of the Agreement and Declaration of Trust and
        Bylaws of the Trust and the objectives and policies of the Fund, as set
        forth in the current Registration Statement of the Trust filed with the
        Securities and Exchange Commission ("SEC") and any applicable federal
        and state laws, and will comply with other policies which the Trustees
        of the Trust (the "Trustees") or the Manager, as the case may be, may
        from time to time determine and which are furnished to the Sub-Adviser.
        The Sub-Adviser shall make its officers and employees available to the
        Manager from time to time at reasonable times to review investment
        policies of the Fund and to consult with the Manager regarding the
        investment affairs of the Fund. In the performance of its duties
        hereunder, the Sub-Adviser is and shall be an independent contractor
        and, unless otherwise expressly provided or authorized, shall have no
        authority to act for or represent the Trust in any way or otherwise be
        deemed to be an agent of the Trust.

    (b) The Sub-Adviser, at its expense, will furnish (i) all investment and
        management facilities, including salaries of personnel necessary for it
        to perform the duties set forth in this Agreement, and (ii)
        administrative facilities, including clerical personnel and equipment
        necessary for the conduct of the investment affairs of the Fund
        (excluding brokerage expenses and pricing and bookkeeping services).

    (c) The Sub-Adviser shall place all orders for the purchase and sale of
        portfolio investments for the Fund with issuers, brokers or dealers
        selected by the Sub-Adviser which may include brokers or dealers
        affiliated with the Sub-Adviser. In the selection of such brokers or
        dealers and the placing of such orders, the Sub-Adviser always shall
        seek best execution (except to the extent permitted by the next sentence
        hereof), which is to place portfolio transactions where the Fund can
        obtain the most favorable
<PAGE>

        combination of price and execution services in particular transactions
        or provided on a continuing basis by a broker or dealer, and to deal
        directly with a principal market maker in connection with over-the-
        counter transactions, except when it is believed that best execution is
        obtainable elsewhere. Subject to such policies as the Trustees may
        determine, the Sub-Adviser shall not be deemed to have acted unlawfully
        or to have breached any duty created by this Agreement or otherwise
        solely by reason of its having caused the Trust to pay a broker or
        dealer that provides brokerage and research services an amount of
        commission for effecting a portfolio investment transaction in excess of
        the amount of commission another broker or dealer would have charged for
        effecting that transaction, if the Sub-Adviser determines in good faith
        that such excess amount of commission was reasonable in relation to the
        value of the brokerage and research services provided by such broker or
        dealer, viewed in terms of either that particular transaction or the
        overall responsibilities of the Sub-Adviser and its affiliates with
        respect to the Trust and to other clients of the Sub-Adviser as to which
        Sub-Adviser or any affiliate of the Sub-Adviser exercises investment
        discretion.

2.   OTHER AGREEMENTS

     It is understood that any of the shareholders, Trustees, officers and
  employees of the Trust may be a shareholder, partner, director, officer or
  employee of, or be otherwise interested in, the Sub-Adviser, and in any person
  controlled by or under common control with the Sub-Adviser, and that the Sub-
  Adviser and any person controlled by or under common control with the Sub-
  Adviser may have an interest in the Trust. It is also understood that the Sub-
  Adviser and persons controlled by or under common control with the Sub-Adviser
  have and may have advisory, management service or other contracts with other
  organizations and persons, and may have other interests and businesses.

3.  COMPENSATION TO BE PAID BY THE MANAGER TO THE SUB-ADVISER

     The Manager will pay to the Sub-Adviser as compensation for the Sub-
  Adviser's services rendered a fee, determined as described in Schedule A which
  is attached hereto and made a part hereof. Such fee shall be paid by the
  Manager and not by the Trust.

4.  AMENDMENTS OF THIS AGREEMENT

     This Agreement (including Schedule A attached hereto) shall not be amended
  as to any Fund unless such amendment is approved at a meeting by the
  affirmative vote of a majority of the outstanding voting securities of the
  Fund, if such approval is required under the Investment Company Act of 1940,
  as amended ("1940 Act"), and by the vote, cast in person at a meeting called
  for the purpose of voting on such approval, of a majority of the Trustees who
  are not interested persons of the Trust or of the Manager or of the Sub-
  Adviser.

                                       2
<PAGE>

5.  EFFECTIVE PERIOD AND TERMINATION OF THIS AGREEMENT

     This Agreement shall be effective as of the date executed, and shall remain
  in full force and effect as to each Fund continuously thereafter, until
  terminated as provided below:

  (a) Unless terminated as herein provided, this Agreement shall remain in full
      force and effect through _______________ and shall continue in full force
      and effect for successive periods of one year thereafter, but only so long
      as such continuance is specifically approved at least annually (i) by the
      Trustees or by the affirmative vote of a majority of the outstanding
      voting securities of the Fund, and (ii) by a vote of a majority of the
      Trustees who are not interested persons of the Trust or of the Manager or
      of any Sub-Adviser, by vote cast in person at a meeting called for the
      purpose of voting on such approval; provided, however, that if the
      continuance of this Agreement is submitted to the shareholders of the Fund
      for their approval and such shareholders fail to approve such continuance
      of this Agreement as provided herein, the Sub-Adviser may continue to
      serve hereunder in a manner consistent with the 1940 Act and the rules and
      regulations thereunder.

  (b) This Agreement may be terminated as to any Fund without the payment of any
      penalty by the Manager, subject to the approval of the Trustees, by vote
      of the Trustees, or by vote of a majority of the outstanding voting
      securities of such Fund at any annual or special meeting or by the Sub-
      Adviser, in each case on sixty days' written notice.

  (c) This Agreement shall terminate automatically, without the payment of any
      penalty, in the event of its assignment or in the event that the
      Management Agreement with the Manager shall have terminated for any
      reason.

  (d) In the event of termination of this Agreement, the Fund will no longer use
      the name "TCW Investment Management Company" or "The TCW Group" in
      materials relating to the Fund except as may be required by the 1940 Act
      and the rules and regulations thereunder.

6.  CERTAIN DEFINITIONS

     For the purposes of this Agreement, the ''affirmative vote of a majority of
  the outstanding voting securities" means the affirmative vote, at a duly
  called and held meeting of shareholders, (a) of the holders of 67% or more of
  the shares of the Fund present (in person or by proxy) and entitled to vote at
  such meeting, if the holders of more than 50% of the outstanding shares of the
  Fund entitled to vote at such meeting are present in person or by proxy, or
  (b) of the holders of more than 50% of the outstanding shares of the Fund
  entitled to vote at such meeting, whichever is less.

     For the purposes of this Agreement, the terms "control", "interested
  person" and "assignment" shall have their respective meanings defined in the
  1940 Act and rules and
<PAGE>

  regulations thereunder, subject, however, to such exemptions as may be granted
  by the SEC under said Act; the term "specifically approve at least annually"
  shall be construed in a manner consistent with the 1940 Act and the rules and
  regulations thereunder; and the term "brokerage and research services" shall
  have the meaning given in the Securities Exchange Act of 1934 and the rules
  and regulations thereunder.

7.  NON-LIABILITY OF SUB-ADVISER

     The Sub-Adviser shall be under no liability to the Trust, the Manager or
  the Trust's Shareholders or creditors for any matter or thing in connection
  with the performance of any of the Sub-Adviser's services hereunder or for any
  losses sustained or that may be sustained in the purchase, sale or retention
  of any investment for the Funds of the Trust made by it in good faith;
  provided, however, that nothing herein contained shall be construed to protect
  the Sub-Adviser against any liability to the Trust by reason of the Sub-
  Adviser's own willful misfeasance, bad faith or gross negligence in the
  performance of its duties or by reason of its reckless disregard of its
  obligations and duties hereunder.

8.  LIMITATIONS OF LIABILITY OF THE TRUSTEES AND SHAREHOLDERS

     A copy of the Trust's Agreement and Declaration of Trust is on file with
  the Secretary of the Commonwealth of Massachusetts, and notice is hereby given
  that this instrument is executed by the Trustees as Trustees and not
  individually and that the obligations of this instrument are not binding upon
  any of the Trustees, officers or shareholders individually but are binding
  only upon the assets and property of the appropriate Fund.

                                       4
<PAGE>

IN WITNESS WHEREOF, ALLMERICA FINANCIAL INVESTMENT MANAGEMENT SERVICES, INC. has
caused this instrument to be signed in duplicate on its behalf by its duly
authorized representative and TCW INVESTMENT MANAGEMENT COMPANY has caused this
instrument to be signed in duplicate on its behalf by its duly authorized
representative, all as of the day and year first above written.



                                       ALLMERICA FINANCIAL INVESTMENT
                                       MANAGEMENT SERVICES, INC.


                                       By:
                                               ---------------------------------

                                       Title:
                                               ---------------------------------


                                       TCW INVESTMENT MANAGEMENT COMPANY


                                       By:
                                               ---------------------------------

                                       Title:
                                               ---------------------------------


Accepted and Agreed to as of the day and year first above written:


ALLMERICA INVESTMENT TRUST

By:     ---------------------------------


Title:
        ---------------------------------


                                       5
<PAGE>

                                   SCHEDULE A
                                   ----------


  The Manager will pay to the Sub-Adviser as full compensation for the Sub-
Adviser's services rendered, a fee computed daily and paid quarterly at an
annual rate of 0.85% based on average daily net assets of the Fund of up to $100
million. When the average daily net assets of the Fund exceed $100 million, the
fee shall be computed daily and paid quarterly at an annual rate of 0.75% of the
total average daily net assets of the Fund.

         FUND                      NET ASSETS                 FEE RATE
         ----                      ----------                 --------

Select Strategic Growth Fund    First $100 million              0.85%
                                Over $100 million               0.75%


  The average daily net assets of the Fund shall be determined by taking an
average of all of the determinations of net asset during each month at the close
of business on each business day during such month while this Agreement is in
effect.

  The fee for each quarter shall be payable within ten (10) business days after
the end of the quarter.

  If the Sub-Adviser shall serve for any period less than a full month, the
foregoing compensation shall be prorated according to the proportion which such
period bears to a full month.

                                       6

<PAGE>

                                                                       Exhibit 7



                              CUSTODIAN AGREEMENT



                                    between



                         INVESTORS BANK & TRUST COMPANY



                                      and



                          ALLMERICA INVESTMENT TRUST
<PAGE>

                              CUSTODIAN AGREEMENT

     AGREEMENT made as of this 1st day of April, 1999, between ALLMERICA
INVESTMENT TRUST, a Massachusetts business trust (the "Fund"), and INVESTORS
BANK & TRUST COMPANY, a Massachusetts trust company (the "Bank").

     The Fund, an open-end management investment company on behalf of the
portfolios/series listed on Appendix A hereto (as such Appendix A may be amended
                            ----------                 ----------
from time to time) (each a "Portfolio" and collectively, the "Portfolios"),
desires to place and maintain all of its portfolio securities and cash in the
custody of the Bank.  The Bank has at least the minimum qualifications required
by Section 17(f)(1) of the Investment Company Act of 1940 (the "1940 Act") to
act as custodian of the portfolio securities and cash of the Fund, and has
indicated its willingness to so act, subject to the terms and conditions of this
Agreement.

     NOW, THEREFORE, in consideration of the premises and of the mutual
agreements contained herein, the parties hereto agree as follows:

     1.  Bank Appointed Custodian.  The Fund hereby appoints the Bank as
         ------------------------
custodian of its portfolio securities and cash delivered to the Bank as
hereinafter described and the Bank agrees to act as such upon the terms and
conditions hereinafter set forth.  For the services rendered pursuant to this
Agreement the Fund agrees to pay to the Bank the fees set forth on Appendix B
                                                                   ----------
hereto.

     2.  Definitions.  Whenever used herein, the terms listed below will have
         -----------
the following meaning:

      2.1  Authorized Person.  Authorized Person will mean any of the persons
           -----------------
duly authorized to give Proper Instructions or otherwise act on behalf of the
Fund by appropriate resolution of its Board, and set forth in a certificate as
required by Section 4 hereof.

      2.2  Board.  Board will mean the Board of Directors or the Board of
           -----
Trustees of the Fund, as the case may be.

      2.3  Security.  The term security as used herein will have the same
           --------
meaning assigned to such term in the Securities Act of 1933, as amended,
including, without limitation, any note, stock, treasury stock, bond, debenture,
evidence of indebtedness, certificate of interest or participation in any profit
sharing agreement, collateral-trust certificate, preorganization certificate or
subscription, transferable share, investment contract, voting-trust certificate,
certificate of deposit for a security, fractional undivided interest in oil,
gas, or other mineral rights, any put, call, straddle, option, or privilege on
any security, certificate of deposit, or group or index of securities (including
any interest therein or based on the value thereof), or any put, call, straddle,
option, or privilege entered into on a national securities exchange relating to
a foreign currency, or, in general, any interest or instrument commonly known as
a "security", or any certificate of interest or participation in, temporary or
interim certificate for, receipt for, guarantee of, or warrant or right to
subscribe to, or option contract to purchase or sell any of the foregoing, and
futures, forward contracts and options thereon.

      2.4  Portfolio Security.  Portfolio Security will mean any Security owned
           ------------------
by the Fund.

      2.5  Officers' Certificate.  Officers' Certificate will mean, unless
           ---------------------
otherwise indicated, any request, direction, instruction, or certification in
writing signed by any two Authorized Persons of the Fund.
<PAGE>

      2.6  Book-Entry System.  Book-Entry System shall mean the Federal Reserve-
           -----------------
Treasury Department Book Entry System for United States government,
instrumentality and agency securities operated by the Federal Reserve Bank, its
successor or successors and its nominee or nominees.

      2.7  Depository.  Depository shall mean The Depository Trust Company
           ----------
("DTC"), a clearing agency registered with the Securities and Exchange
Commission under Section 17A of the Securities Exchange Act of 1934 ("Exchange
Act"), its successor or successors and its nominee or nominees. The term
"Depository" shall further mean and include any other person authorized to act
as a depository under the 1940 Act, its successor or successors and its nominee
or nominees, specifically identified in a certified copy of a resolution of the
Board.

      2.8  Proper Instructions.  Proper Instructions shall mean (i) instructions
           -------------------
regarding the purchase or sale of Portfolio Securities, and payments and
deliveries in connection therewith, given by an Authorized Person, such
instructions to be given in such form and manner as the Bank and the Fund shall
agree upon from time to time, and (ii) instructions (which may be continuing
instructions) regarding other matters signed or initialed by an Authorized
Person.  Oral instructions will be considered Proper Instructions if the Bank
reasonably believes them to have been given by an Authorized Person. The Fund
shall cause all oral instructions to be promptly confirmed in writing. The Bank
shall act upon and comply with any subsequent Proper Instruction which modifies
a prior instruction and shall use reasonable efforts to detect any discrepancy
between the original instruction and such confirmation and to report such
discrepancy promptly to the Fund. The Fund shall be responsible, at the Fund's
expense, for taking any action, including any reprocessing, necessary to correct
any such discrepancy or error, and to the extent such action requires the Bank
to act, the Fund shall give the Bank Proper Instructions as to the action
required. Upon receipt by the Bank of an Officers' Certificate as to the
authorization by the Board accompanied by a detailed description of procedures
approved by the Fund, Proper Instructions may include communication effected
directly between electro-mechanical or electronic devices provided that the
Board and the Bank agree in writing that such procedures afford adequate
safeguards for the Fund's assets.

     3.  Separate Accounts. The Bank will segregate the assets of each Portfolio
         -----------------
to which this Agreement relates into a separate account for each such Portfolio
containing the assets of such Portfolio (and all investment earnings thereon).
Unless the context otherwise requires, any reference in this Agreement to any
actions to be taken by the Fund shall be deemed to refer to the Fund acting on
behalf of one or more of its Portfolios, any reference in this Agreement to any
assets of the Fund, including, without limitation, any portfolio securities and
cash and earnings thereon, shall be deemed to refer only to assets of the
applicable Portfolio, any duty or obligation of the Bank hereunder to the Fund
shall be deemed to refer to duties and obligations with respect to such
individual Portfolio and any obligation or liability of the Fund hereunder shall
be binding only with respect to such individual Portfolio, and shall be
discharged only out of the assets of such Portfolio.

     4.  Certification as to Authorized Persons.  The Secretary or Assistant
         --------------------------------------
Secretary of the Fund will at all times maintain on file with the Bank his or
her certification to the Bank, in such form as may be acceptable to the Bank, of
(i) the names and signatures of the Authorized Persons and (ii) the names of the
members of the Board, it being understood that upon the occurrence of any change
in the information set forth in the most recent certification on file (including
without limitation any person named in the most recent certification who is no
longer an Authorized Person as designated therein), the Secretary or Assistant
Secretary of the Fund will sign a new or amended certification setting forth the
change and the new, additional or omitted names or signatures. The Bank will be
entitled to rely and act upon any

                                       2
<PAGE>

Officers' Certificate given to it by the Fund which has been signed by
Authorized Persons named in the most recent certification received by the Bank.

     5.  Custody of Cash.  As custodian for the Fund, the Bank will open and
         ---------------
maintain a separate account or accounts in the name of the Fund or in the name
of the Bank, as Custodian of the Fund, and will deposit to the account of the
Fund all of the cash of the Fund, except for cash held by a subcustodian
appointed pursuant to Sections 14.2 or 14.3 hereof, including borrowed funds,
delivered to the Bank, subject only to draft or order by the Bank acting
pursuant to the terms of this Agreement.  Pursuant to the Bank's internal
policies regarding the management of cash accounts and in order to allow the
Bank to comply with applicable Federal Deposit Insurance Corporation and Federal
Reserve Board regulations, the Bank may segregate certain portions of the cash
of the Fund into a separate savings deposit account upon which the Bank reserves
the right to require seven (7) days notice prior to withdrawal of cash from such
an account.  The Fund may at any time instruct the Bank to cease such
segregation of the Fund's cash.  Upon receipt by the Bank of Proper Instructions
(which may be continuing instructions) or in the case of payments for
redemptions and repurchases of outstanding shares of common stock of the Fund,
notification from the Fund's transfer agent as provided in Section 7, requesting
such payment, designating the payee or the account or accounts to which the Bank
will release funds for deposit, and stating that it is for a purpose permitted
under the terms of this Section 5, specifying the applicable subsection, the
Bank will make payments of cash held for the accounts of the Fund, insofar as
funds are available for that purpose, only as permitted in subsections 5.1-5.9
below.

      5.1  Purchase of Securities.  Upon the purchase of securities for the
           ----------------------
Fund, against contemporaneous receipt of such securities by the Bank or against
delivery of such securities to the Bank in accordance with generally accepted
settlement practices and customs in the jurisdiction or market in which the
transaction occurs registered in the name of the Fund or in the name of, or
properly endorsed and in form for transfer to, the Bank, or a nominee of the
Bank, or receipt for the account of the Bank pursuant to the provisions of
Section 6 below, each such payment to be made at the purchase price shown on a
broker's confirmation (or transaction report in the case of Book Entry Paper (as
that term is defined in Section 6.6 hereof)) of purchase of the securities
received by the Bank before such payment is made, as confirmed in the Proper
Instructions received by the Bank before such payment is made.

      5.2  Redemptions.  In such amount as may be necessary for the repurchase
           -----------
or redemption of common shares of the Fund offered for repurchase or redemption
in accordance with Section 7 of this Agreement.

      5.3  Distributions and Expenses of Fund.  For the payment on the account
           ----------------------------------
of the Fund of dividends or other distributions to shareholders as may from time
to time be declared by the Board, interest, taxes, management or supervisory
fees, distribution fees, fees of the Bank for its services hereunder and
reimbursement of the expenses and liabilities of the Bank as provided hereunder,
fees of any transfer agent, fees for legal, accounting, and auditing services,
or other operating expenses of the Fund.

      5.4  Payment in Respect of Securities.  For payments in connection with
           --------------------------------
the conversion, exchange or surrender of Portfolio Securities or securities
subscribed to by the Fund held by or to be delivered to the Bank.

      5.5  Repayment of Loans.  To repay loans of money made to the Fund, but,
           ------------------
in the case of final payment, only upon redelivery to the Bank of any Portfolio
Securities pledged or hypothecated therefor and upon surrender of documents
evidencing the loan;

                                       3
<PAGE>

      5.6  Repayment of Cash.  To repay the cash delivered to the Fund for the
           -----------------
purpose of collateralizing the obligation to return to the Fund certificates
borrowed from the Fund representing Portfolio Securities, but only upon
redelivery to the Bank of such borrowed certificates.

      5.7  Foreign Exchange Transactions.
           -----------------------------

           (a) For payments in connection with foreign exchange contracts or
options to purchase and sell foreign currencies for spot and future delivery
(collectively, "Foreign Exchange Agreements") which may be entered into by the
Bank on behalf of the Fund upon the receipt of Proper Instructions, such Proper
Instructions to specify the currency broker or banking institution (which may be
the Bank, or any other subcustodian or agent hereunder, acting as principal)
with which the contract or option is made.  The Bank shall have no duty with
respect to the selection of such currency brokers or banking institutions with
which the Fund deals or for their failure to comply with the terms of any
contract or option.

           (b) In order to secure any payments in connection with Foreign
Exchange Agreements which may be entered into by the Bank pursuant to Proper
Instructions, the Fund agrees that the Bank shall have a continuing lien and
security interest, to the extent of any payment due under any Foreign Exchange
Agreement, in and to any property at any time held by the Bank for the Fund's
benefit or in which the Fund has an interest and which is then in the Bank's
possession or control (or in the possession or control of any third party acting
on the Bank's behalf). The Fund authorizes the Bank, in the Bank's sole
discretion, at any time to charge any such payment due under any Foreign
Exchange Agreement against any balance of account standing to the credit of the
Fund on the Bank's books, provided that if the obligations secured pursuant to
this section can be allocated to a specific Portfolio, such security interest
will be limited to the property held for that Portfolio only.

          5.8  Other Authorized Payments.  For other authorized transactions of
               -------------------------
the Fund, or other obligations of the Fund incurred for proper Fund purposes;
provided that before making any such payment the Bank will also receive a
certified copy of a resolution of the Board signed by an Authorized Person
(other than the Person certifying such resolution) and certified by its
Secretary or Assistant Secretary, naming the person or persons to whom such
payment is to be made, and either describing the transaction for which payment
is to be made and declaring it to be an authorized transaction of the Fund, or
specifying the amount of the obligation for which payment is to be made, setting
forth the purpose for which such obligation was incurred and declaring such
purpose to be a proper corporate purpose.

          5.9  Termination:  Upon the termination of this Agreement as
               -----------
hereinafter set forth pursuant to Section 8 and Section 16 of this Agreement.

         6.  Securities.
             ----------

          6.1  Segregation and Registration.  Except as otherwise provided
               ----------------------------
herein, and except for securities to be delivered to any subcustodian appointed
pursuant to Sections 14.2 or 14.3 hereof, the Bank as custodian will receive and
hold  pursuant to the provisions hereof, in a separate account or accounts and
physically segregated at all times from those of other persons, any and all
Portfolio Securities which may now or hereafter be delivered to it by or for the
account of the Fund. All such Portfolio Securities will be held or disposed of
by the Bank for, and subject at all times to, the instructions of the Fund
pursuant to the terms of this Agreement.  Subject to the specific provisions
herein relating to Portfolio Securities that are not physically held by the
Bank, the Bank will register all Portfolio Securities (unless otherwise directed
by Proper Instructions or an Officers' Certificate), in the name of a registered
nominee of the Bank as defined in the Internal Revenue Code and any Regulations

                                       4
<PAGE>

of the Treasury Department issued thereunder, and will execute and deliver all
such certificates in connection therewith as may be required by such laws or
regulations or under the laws of any state.

         The Fund will from time to time furnish to the Bank appropriate
instruments to enable it to hold or deliver in proper form for transfer, or to
register in the name of its registered nominee, any Portfolio Securities which
may from time to time be registered in the name of the Fund.

          6.2  Voting and Proxies.  Neither the Bank nor any nominee of the Bank
               ------------------
will vote any of the Portfolio Securities held hereunder, except in accordance
with Proper Instructions or an Officers' Certificate. The Bank will execute and
deliver, or cause to be executed and delivered, to the Fund or, if so instructed
by the Fund, to the investment advisor, all notices, proxies and proxy
soliciting materials delivered to the Bank with respect to such Securities, such
proxies to be executed by the registered holder of such Securities (if
registered otherwise than in the name of the Fund), but without indicating the
manner in which such proxies are to be voted.

          6.3  Corporate Action.  If at any time the Bank is notified that an
               ----------------
issuer of any Portfolio Security has taken or intends to take a corporate action
(a "Corporate Action") that affects the rights, privileges, powers, preferences,
qualifications or ownership of a Portfolio Security, including without
limitation, liquidation, consolidation, merger, recapitalization,
reorganization, reclassification, subdivision, combination, stock split or stock
dividend, which Corporate Action requires an affirmative response or action on
the part of the holder of such Portfolio Security (a "Response"), the Bank shall
notify the Fund or, if so instructed by the Fund, the investment advisor,
promptly of the Corporate Action, the Response required in connection with the
Corporate Action and the Bank's deadline for receipt from the Fund of Proper
Instructions regarding the Response (the "Response Deadline").  The Bank shall
use commercially reasonable efforts to monitor Corporate Action activity related
to Portfolio Securities.  The Bank also shall employ systems to track the
statues of required Responses and the corresponding Corporate Action expiration
dates at the applicable depository.  The Bank shall forward to the Fund via
telecopier and/or overnight courier all notices, information statements or other
materials relating to the Corporate Action promptly after receipt of such
materials by the Bank.

               (a) The Bank shall act upon a required Response only after
receipt by the Bank of Proper Instructions from the Fund no later than 5:00 p.m.
on the date specified as the Response Deadline and only if the Bank (or its
agent or subcustodian hereunder) has actual possession of all necessary
Securities, consents and other materials no later than 5:00 p.m. on the date
specified as the Response Deadline.

               (b) The Bank shall have no duty to act upon a required Response
if Proper Instructions relating to such Response and all necessary Securities,
consents and other materials are not received by and in the possession of the
Bank by 5:00 p.m. on the date specified as the Response Deadline.
Notwithstanding, the Bank shall use its best efforts to act upon a Response for
which Proper Instructions and/or necessary Securities, consents or other
materials are received by the Bank after 5:00 p.m. on the date specified as the
Response Deadline, it being acknowledged and agreed by the parties that while
any undertaking by the Bank to use its best efforts in such circumstances shall
not create a duty upon the Bank to complete such Response prior to its
expiration, the Bank nevertheless shall use its best efforts to do so.

               (c) In the event that the Fund notifies the Bank of a Corporate
Action requiring a Response and the Bank has received no other notice of such
Corporate Action, the Response Deadline shall be one business day prior to the
Response expiration time set by the depository processing such Corporate Action
provided that the Fund has the information necessary to direct such Response.

                                       5
<PAGE>

             (d) Section 14.3(g) of this Agreement shall govern any Corporate
Action involving Foreign Portfolio Securities held by a Selected Foreign Sub-
Custodian.

        6.4  Book-Entry System.  Provided (i) the Bank has received a certified
             -----------------
copy of a resolution of the Board specifically approving deposits of Fund assets
in the Book-Entry System, and (ii) for any subsequent changes to such
arrangements following such approval, the Board has reviewed and approved the
arrangement and has not delivered an Officer's Certificate to the Bank
indicating that the Board has withdrawn its approval:

             (a) The Bank may keep Portfolio Securities in the Book-Entry System
provided that such Portfolio Securities are represented in an account
("Account") of the Bank (or its agent) in such System which shall not include
any assets of the Bank (or such agent) other than assets held as a fiduciary,
custodian, or otherwise for customers;

             (b) The records of the Bank (and any such agent) with respect to
the Fund's participation in the Book-Entry System through the Bank (or any such
agent) will identify by book entry the Portfolio Securities which are included
with other securities deposited in the Account and shall at all times during the
regular business hours of the Bank (or such agent) be open for inspection by
duly authorized officers, employees or agents of the Fund. Where securities are
transferred to the Fund's account, the Bank shall also, by book entry or
otherwise, identify as belonging to the Fund a quantity of securities in a
fungible bulk of securities (i) registered in the name of the Bank or its
nominee, or (ii) shown on the Bank's account on the books of the Federal Reserve
Bank;

             (c) The Bank (or its agent) shall pay for securities purchased for
the account of the Fund or shall pay cash collateral against the return of
Portfolio Securities loaned by the Fund upon (i) receipt of advice from the
Book-Entry System that such Securities have been transferred to the Account, and
(ii) the making of an entry on the records of the Bank (or its agent) to reflect
such payment and transfer for the account of the Fund. The Bank (or its agent)
shall transfer securities sold or loaned for the account of the Fund upon

                 (i)    receipt of advice from the Book-Entry System that
payment for securities sold or payment of the initial cash or securities
collateral against the delivery of securities loaned by the Fund has been
transferred to the Account; and

                 (ii)   the making of an entry on the records of the Bank (or
its agent) to reflect such transfer and payment for the account of the Fund.
Copies of all advices from the Book-Entry System of transfers of securities for
the account of the Fund shall identify the Fund, be maintained for the Fund by
the Bank and shall be provided to the Fund at its request. The Bank shall send
the Fund a confirmation, as defined by Rule 17f-4 of the 1940 Act, of any
transfers to or from the account of the Fund;

             (d) The Bank will promptly provide the Fund with any report
obtained by the Bank or its agent on the Book-Entry System's accounting system,
internal accounting control and procedures for safeguarding securities deposited
in the Book-Entry System;

        6.5  Use of a Depository.  Provided (i) the Bank has received a
             -------------------
certified copy of a resolution of the Board specifically approving deposits in
DTC or other such Depository and (ii) for any subsequent changes to such
arrangements following such approval, the Board has reviewed and approved the

                                       6
<PAGE>

arrangement and has not delivered an Officer's Certificate to the Bank
indicating that the Board has withdrawn its approval:

             (a) The Bank may use a Depository to hold, receive, exchange,
release, lend, deliver and otherwise deal with Portfolio Securities including
stock dividends, rights and other items of like nature, and to receive and remit
to the Bank on behalf of the Fund all income and other payments thereon and to
take all steps necessary and proper in connection with the collection thereof;

             (b) Registration of Portfolio Securities may be made in the name of
any nominee or nominees used by such Depository and held for the account of the
Bank for its customers;

             (c) Payment for securities purchased and sold may be made through
the clearing medium employed by such Depository for transactions of participants
acting through it. Upon any purchase of Portfolio Securities, payment will be
made only upon delivery of the securities to or for the account of the Fund and
the Fund shall pay cash collateral against the return of Portfolio Securities
loaned by the Fund only upon delivery of the Securities to or for the account of
the Fund; and upon any sale of Portfolio Securities, delivery of the Securities
will be made only against payment therefor or, in the event Portfolio Securities
are loaned, delivery of Securities will be made only against receipt of the
initial cash collateral to or for the account of the Fund; and

             (d) The Bank shall use its best efforts and reasonable care to
provide that:

                 (i)    The Depository obtains replacement of any certificated
Portfolio Security deposited with it in the event such Security is lost,
destroyed, wrongfully taken or otherwise not available to be returned to the
Bank upon its request;

                 (ii)   Proxy materials received by a Depository with respect to
Portfolio Securities deposited with such Depository are forwarded immediately to
the Bank for prompt transmittal to the Fund;

                 (iii)  Such Depository promptly forwards to the Bank
confirmation of any purchase or sale of Portfolio Securities and of the
appropriate book entry made by such Depository to the Fund's account;

                 (iv)   Such Depository prepares and delivers to the Bank such
records with respect to the performance of the Bank's obligations and duties
hereunder as may be necessary for the Fund to comply with the recordkeeping
requirements of Section 31(a) of the 1940 Act and the Rules thereunder; and

                 (v)    Such Depository delivers to the Bank all internal
accounting control reports, whether or not audited by an independent public
accountant, as well as such other reports as the Fund may reasonably request in
order to verify the Portfolio Securities held by such Depository and the Bank
shall, upon request by the Fund, forward such reports to the Fund.

        6.6  Use of Book-Entry System for Commercial Paper.  Provided the Bank
             ---------------------------------------------
has received a certified copy of a resolution of the Board specifically
approving participation in a system maintained by the Bank for the holding of
commercial paper in book-entry form ("Book-Entry Paper"), upon receipt of Proper
Instructions and upon receipt of confirmation from an Issuer (as defined below)
that the Fund has purchased such Issuer's Book-Entry Paper, the Bank shall issue
and hold in book-entry form, on behalf of

                                       7
<PAGE>

the Fund, commercial paper issued by issuers with whom the Bank has entered into
a book-entry agreement (the "Issuers"). In maintaining procedures for Book-Entry
Paper, the Bank agrees that:

             (a) The Bank will maintain all Book-Entry Paper held by the Fund in
an account of the Bank that includes only assets held by it for customers;

             (b) The records of the Bank with respect to the Fund's purchase of
Book-Entry Paper through the Bank will identify, by book-entry, commercial paper
belonging to the Fund which is included in the Book-Entry System and shall at
all times during the regular business hours of the Bank be open for inspection
by duly authorized officers, employees or agents of the Fund;

             (c) The Bank shall pay for Book-Entry Paper purchased for the
account of the Fund upon contemporaneous (i) receipt of advice from the Issuer
that such sale of Book-Entry Paper has been effected, and (ii) the making of an
entry on the records of the Bank to reflect such payment and transfer for the
account of the Fund;

             (d) The Bank shall cancel such Book-Entry Paper obligation upon the
maturity thereof upon contemporaneous (i) receipt of advice that payment for
such Book-Entry Paper has been transferred to the Fund, and (ii) the making of
an entry on the records of the Bank to reflect such payment for the account of
the Fund; and

             (e) The Bank will send to the Fund such reports on its system of
internal accounting control with respect to the Book-Entry Paper as the Fund may
reasonably request from time to time.

        6.7  Use of Immobilization Programs. Provided (i) the Bank has received
             ------------------------------
a certified copy of a resolution of the Board specifically approving the
maintenance of Portfolio Securities in an immobilization program operated by a
bank which meets the requirements of Section 26(a)(1) of the 1940 Act, and (ii)
for each year following such approval the Board has reviewed and approved the
arrangement and has not delivered an Officer's Certificate to the Bank
indicating that the Board has withdrawn its approval, the Bank shall enter into
such immobilization program with such bank acting as a subcustodian hereunder.

        6.8  Eurodollar CDs.  Any Portfolio Securities which are Eurodollar CDs
             --------------
may be physically held by the European branch of the U.S. banking institution
that is the issuer of such Eurodollar CD (a "European Branch"), provided that
such Portfolio Securities are identified on the books of the Bank as belonging
to the Fund and that the books of the Bank identify the European Branch holding
such Portfolio Securities. Notwithstanding any other provision of this Agreement
to the contrary, except as stated in the first sentence of this subsection 6.8
and provided it acts without negligence, bad faith and willful misconduct, the
Bank shall be under no other duty with respect to such Eurodollar CDs belonging
to the Fund.

        6.9  Options and Futures Transactions.
             --------------------------------

             (a) Puts and Calls Traded on Securities Exchanges, NASDAQ or Over-
the-Counter.

                 (i)    The Bank shall take action as to put options ("puts")
and call options ("calls") purchased or sold (written) by the Fund regarding
escrow or other arrangements (i) in accordance with the provisions of any
agreement entered into upon receipt of Proper Instructions among the Bank, any
broker-dealer registered with the National Association of Securities Dealers,
Inc. (the "NASD"), and, if necessary, the Fund, relating to the compliance with
the rules of the Options Clearing

                                       8
<PAGE>

Corporation and of any registered national securities exchange, or of any
similar organization or organizations.

                 (ii)   Unless another agreement requires it to do so, the Bank
shall be under no duty or obligation to see that the Fund has deposited or is
maintaining adequate margin, if required, with any broker in connection with any
option, nor shall the Bank be under duty or obligation to present such option to
the broker for exercise unless it receives Proper Instructions from the Fund.
The Bank shall have no responsibility for the legality of any put or call
purchased or sold on behalf of the Fund, the propriety of any such purchase or
sale, or the adequacy of any collateral delivered to a broker in connection with
an option or deposited to or withdrawn from a Segregated Account (as defined in
subsection 6.10 below). The Bank specifically, but not by way of limitation,
shall not be under any duty or obligation to: (i) periodically check or notify
the Fund that the amount of such collateral held by a broker or held in a
Segregated Account is sufficient to protect such broker or the Fund against any
loss; (ii) effect the return of any collateral delivered to a broker; or (iii)
advise the Fund that any option it holds, has or is about to expire. Such duties
or obligations shall be the responsibility of the Fund.

             (b) Puts, Calls and Futures Traded on Commodities Exchanges

                 (i)    The Bank shall take action as to puts, calls and futures
contracts ("Futures") purchased or sold by the Fund in accordance with the
provisions of any agreement entered into upon the receipt of Proper Instructions
among the Fund, the Bank and a Futures Commission Merchant registered under the
Commodity Exchange Act, relating to compliance with the rules of the Commodity
Futures Trading Commission and/or any Contract Market, or any similar
organization or organizations, regarding account deposits in connection with
transactions by the Fund.

                 (ii)   The responsibilities of the Bank as to futures, puts and
calls traded on commodities exchanges, any Futures Commission Merchant account
and the Segregated Account shall be limited as set forth in subparagraph (a)(ii)
of this Section 6.9 as if such subparagraph referred to Futures Commission
Merchants rather than brokers, and Futures and puts and calls thereon instead of
options.

      6.10   Segregated Account.  The Bank shall upon receipt of Proper
             ------------------
Instructions establish and maintain a Segregated Account or Accounts for and on
behalf of the Fund.

             (a) Cash and/or Portfolio Securities may be transferred into a
Segregated Account upon receipt of Proper Instructions in the following
circumstances:

                 (i)    in accordance with the provisions of any agreement among
the Fund, the Bank and a broker-dealer registered under the Exchange Act and a
member of the NASD or any Futures Commission Merchant registered under the
Commodity Exchange Act, relating to compliance with the rules of the Options
Clearing Corporation and of any registered national securities exchange or the
Commodity Futures Trading Commission or any registered Contract Market, or of
any similar organizations regarding escrow or other arrangements in connection
with transactions by the Fund;

                 (ii)   for the purpose of segregating cash or securities in
connection with options purchased or written by the Fund or commodity futures
purchased or written by the Fund;

                 (iii)  for the deposit of liquid assets, such as cash, U.S.
Government securities or other high grade debt obligations, having a market
value (marked to market on a daily basis) at all times equal to not less than
the aggregate purchase price due on the settlement dates of all the Fund's then
outstanding forward commitment or "when-issued" agreements relating to the
purchase of Portfolio

                                       9
<PAGE>

Securities and all the Fund's then outstanding commitments under reverse
repurchase agreements entered into with broker-dealer firms;

              (iv) for the purposes of compliance by the Fund with the
procedures required by Investment Company Act Release No. 10666, or any
subsequent release or releases of the Securities and Exchange Commission
relating to the maintenance of Segregated Accounts by registered investment
companies;

              (v) for other proper corporate purposes, but only, in the case of
this clause (v), upon receipt of, in addition to Proper Instructions, a
certified copy of a resolution of the Board, or of the executive committee of
the Board signed by an officer of the Fund and certified by the Secretary or an
Assistant Secretary, setting forth the purpose or purposes of such Segregated
Account and declaring such purposes to be proper corporate purposes.

          (b) Cash and/or Portfolio Securities may be withdrawn from a
Segregated Account pursuant to Proper Instructions in the following
circumstances:

              (i) with respect to assets deposited in accordance with the
provisions of any agreements referenced in (a)(i) or (a)(ii) above, in
accordance with the provisions of such agreements;

              (ii) with respect to assets deposited pursuant to (a)(iii) or
(a)(iv) above, for sale or delivery to meet the Fund's obligations under
outstanding forward commitment or when-issued agreements for the purchase of
Portfolio Securities and under reverse repurchase agreements;

              (iii) for exchange for other liquid assets of equal or greater
value deposited in the Segregated Account;

              (iv) to the extent that the Fund's outstanding forward commitment
or when-issued agreements for the purchase of portfolio securities or reverse
repurchase agreements are sold to other parties or the Fund's obligations
thereunder are met from assets of the Fund other than those in the Segregated
Account;

              (v) for delivery upon settlement of a forward commitment or when-
issued agreement for the sale of Portfolio Securities; or

              (vi) with respect to assets deposited pursuant to (a)(v) above, in
accordance with the purposes of such account as set forth in Proper
Instructions.

      6.11  Interest Bearing Call or Time Deposits. The Bank shall, upon receipt
            --------------------------------------
of Proper Instructions relating to the purchase by the Fund of interest-bearing
fixed-term and call deposits, transfer cash, by wire or otherwise, in such
amounts and to such bank or banks as shall be indicated in such Proper
Instructions. The Bank shall include in its records with respect to the assets
of the Fund appropriate notation as to the amount of each such deposit, the
banking institution with which such deposit is made (the "Deposit Bank"), and
shall retain such forms of advice or receipt evidencing the deposit, if any, as
may be forwarded to the Bank by the Deposit Bank. Such deposits shall be deemed
Portfolio Securities of the Fund and the responsibility of the Bank therefore
shall be the same as and no greater than the Bank's responsibility in respect of
other Portfolio Securities of the Fund.

                                      10
<PAGE>

      6.12  Transfer of Securities. The Bank will transfer, exchange, deliver or
            ----------------------
release Portfolio Securities held by it hereunder, insofar as such Securities
are available for such purpose, provided that any transfer, exchange, delivery
or release under this Section shall be made only in accordance with Proper
Instructions.  The Proper Instructions shall state that such transfer, exchange
or delivery is for a purpose permitted under the terms of this Section 6.12, and
shall specify the applicable subsection, or describe the purpose of the
transaction with sufficient particularity to permit the Bank to ascertain the
applicable subsection.  After receipt of such Proper Instructions, the Bank will
transfer, exchange, deliver or release Portfolio Securities only in the
following circumstances:

          (a) Upon sales of Portfolio Securities for the account of the Fund,
against contemporaneous receipt by the Bank of payment therefor in full, or
against payment to the Bank in accordance with generally accepted settlement
practices and customs in the jurisdiction or market in which the transaction
occurs, each such payment to be in the amount of the sale price shown in a
broker's confirmation of sale received by the Bank before such payment is made,
as confirmed in the Proper Instructions received by the Bank before such payment
is made;

          (b) In exchange for or upon conversion into other securities alone or
other securities and cash pursuant to any plan of merger, consolidation,
reorganization, share split-up, change in par value, recapitalization or
readjustment or otherwise, upon exercise of subscription, purchase or sale or
other similar rights represented by such Portfolio Securities, or for the
purpose of tendering shares in the event of a tender offer therefor, provided,
however, that in the event of an offer of exchange, tender offer, or other
exercise of rights requiring the physical tender or delivery of Portfolio
Securities, the Bank, absent its own negligence, bad faith and willful
misconduct, shall have no liability for failure to so tender in a timely manner
unless such Proper Instructions are received by the Bank at least two business
days prior to the date required for tender, and unless the Bank (or its agent or
subcustodian hereunder) has actual possession of such Security at least two
business days prior to the date of tender;

          (c) Upon conversion of Portfolio Securities pursuant to their terms
into other securities;

          (d) For the purpose of redeeming in-kind shares of the Fund upon
authorization from the Fund;

          (e) In the case of option contracts owned by the Fund, for
presentation to the endorsing broker;

          (f) When such Portfolio Securities are called, redeemed or retired or
otherwise become payable;

          (g) For the purpose of effectuating the pledge of Portfolio Securities
held by the Bank in order to collateralize loans made to the Fund by any bank,
including the Bank; provided, however, that such Portfolio Securities will be
released only upon payment to the Bank for the account of the Fund of the moneys
borrowed, provided further, however, that in cases where additional collateral
is required to secure a borrowing already made, and such fact is made to appear
in the Proper Instructions, Portfolio Securities may be released for that
purpose without any such payment. In the event that any pledged Portfolio
Securities are held by the Bank, they will be so held for the account of the
lender, and after notice to the Fund from the lender in accordance with the
normal procedures of the lender and any loan agreement between the fund and the
lender that an event of deficiency or default on the loan has occurred, the Bank
may deliver such pledged Portfolio Securities to or for the account of the
lender;

                                      11
<PAGE>

          (h) for the purpose of releasing certificates representing Portfolio
Securities, against contemporaneous receipt by the Bank of the fair market value
of such security, as set forth in the Proper Instructions received by the Bank
before such payment is made;

          (i) for the purpose of delivering securities lent by the Fund to a
bank or broker dealer, but only against receipt in accordance with street
delivery custom except as otherwise provided herein, of adequate collateral as
agreed upon from time to time by the Fund and the Bank, and upon receipt of
payment in connection with any repurchase agreement relating to such securities
entered into by the Fund;

          (j) for other authorized transactions of the Fund or for other proper
corporate purposes; provided that before making such transfer, the Bank will
also receive a certified copy of resolutions of the Board, signed by an
authorized officer of the Fund (other than the officer certifying such
resolution) and certified by its Secretary or Assistant Secretary, specifying
the Portfolio Securities to be delivered, setting forth the transaction in or
purpose for which such delivery is to be made, declaring such transaction to be
an authorized transaction of the Fund or such purpose to be a proper corporate
purpose, and naming the person or persons to whom delivery of such securities
shall be made; and

          (k) upon termination of this Agreement as hereinafter set forth
pursuant to Section 8 and Section 16 of this Agreement.

      As to any deliveries made by the Bank pursuant to this Section 6.12,
securities or cash receivable in exchange therefor shall be delivered to the
Bank.

      7.  Redemptions.  In the case of payment of assets of the Fund held by the
          -----------
Bank in connection with redemptions and repurchases by the Fund of outstanding
common shares, the Bank will rely on notification by the Fund's transfer agent
of receipt of a request for redemption and certificates, if issued, in proper
form for redemption before such payment is made. Payment shall be made in
accordance with the Articles of Incorporation or Declaration of Trust and By-
laws of the Fund (the "Articles"), from assets available for said purpose.

      8.  Merger, Dissolution, etc. of Fund.  In the case of the following
          ---------------------------------
transactions, not in the ordinary course of business, namely, the merger of the
Fund into or the consolidation of the Fund with another investment company, the
sale by the Fund of all, or substantially all, of its assets to another
investment company, or the liquidation or dissolution of the Fund and
distribution of its assets, the Bank will deliver the Portfolio Securities held
by it under this Agreement and disburse cash only upon the order of the Fund set
forth in an Officers' Certificate, accompanied by a certified copy of a
resolution of the Board authorizing any of the foregoing transactions. Upon
completion of such delivery and disbursement and the payment of the fees through
the end of the then current term of this Agreement, disbursements and expenses
of the Bank and satisfactory completion of any other duties and obligations of
the Bank hereunder, this Agreement will terminate and the Bank shall be released
from any and all obligations hereunder.

      9.  Actions of Bank Without Prior Authorization.  Notwithstanding anything
          -------------------------------------------
herein to the contrary, unless and until the Bank receives an Officers'
Certificate to the contrary, the Bank will take the following actions without
prior authorization or instruction of the Fund or the transfer agent, if any:

       9.1  Endorse for collection and collect on behalf of and in the name of
the Fund all checks, drafts, or other negotiable or transferable instruments or
other orders for the payment of money received

                                      12
<PAGE>

by it for the account of the Fund and hold for the account of the Fund all
income, dividends, interest and other payments or distributions of cash with
respect to the Portfolio Securities held thereunder;

      9.2  Present for payment all coupons and other income items held by it for
the account of the Fund which call for payment upon presentation and hold the
cash received by it upon such payment for the account of the Fund;

      9.3  Receive and hold for the account of the Fund all securities received
as a distribution on Portfolio Securities as a result of a stock dividend, share
split-up, reorganization, recapitalization, merger, consolidation, readjustment,
distribution of rights and similar securities issued with respect to any
Portfolio Securities held by it hereunder.

      9.4  Execute as agent on behalf of the Fund all necessary ownership and
other certificates and affidavits required by the Internal Revenue Code or the
regulations of the Treasury Department issued thereunder, or by the laws of any
state, now or hereafter in effect, inserting the Fund's name on such
certificates as the owner of the securities covered thereby, to the extent it
may lawfully do so and as may be required to obtain payment in respect thereof.
The Bank will execute and deliver such certificates in connection with Portfolio
Securities delivered to it or by it under this Agreement as may be required
under the provisions of the Internal Revenue Code and any Regulations of the
Treasury Department issued thereunder, or under the laws of any State;

      9.5  Present for payment all Portfolio Securities which are called,
redeemed, retired or otherwise become payable, and hold cash received by it upon
payment for the account of the Fund; and

      9.6  Exchange interim receipts or temporary securities for definitive
securities.

      10.  Collections and Defaults. The Bank will use reasonable efforts to
           ------------------------
collect promptly any funds which may to its knowledge become collectible arising
from Portfolio Securities, including dividends, interest and other income, and
to transmit promptly to the Fund notice actually received by it of any call for
redemption, offer of exchange, right of subscription, reorganization or other
proceedings affecting such Securities.  If Portfolio Securities upon which such
income is payable are in default or payment is refused after due demand or
presentation, the Bank will notify the Fund in writing of any default or refusal
to pay within two business days from the day on which it receives knowledge of
such default or refusal.

      11.  Maintenance of Records and Accounting Services.  The Bank will
           ----------------------------------------------
maintain records with respect to transactions for which the Bank is responsible
pursuant to the terms and conditions of this Agreement, and in compliance with
the applicable rules and regulations of the 1940 Act.  The books and records of
the Bank pertaining to its actions under this Agreement and reports by the Bank
or its independent accountants concerning its accounting system, procedures for
safeguarding securities and internal accounting controls will be open to
inspection and audit at reasonable times by officers of or auditors employed by
the Fund and will be preserved by the Bank in the manner and in accordance with
the applicable rules and regulations under the 1940 Act.

     The Bank shall perform fund accounting and shall keep the books of account
and render statements or copies from time to time as reasonably requested by the
Treasurer or any executive officer of the Fund.

     The Bank shall assist generally in the preparation of reports to
shareholders and others, audits of accounts, and other ministerial matters of
like nature.

                                      13
<PAGE>

     The books and records maintained by the Bank on behalf of the Fund are the
property of the Fund and will be surrendered to the Fund upon request.

      12.  Fund Evaluation and Yield Calculation
          -------------------------------------

       12.1  Fund Evaluation. The Bank shall compute and, unless otherwise
             ---------------
directed by the Board, determine as of the close of regular trading on the New
York Stock Exchange on each day on which said Exchange is open for unrestricted
trading and as of such other days, or hours, if any, as may be authorized by the
Board,  the net asset value and the public offering price of a share of capital
stock of the Fund, such determination to be made in accordance with the
provisions of the Articles and By-laws of the Fund and the Prospectus and
Statement of Additional Information relating to the Fund, as they may from time
to time be amended, and any applicable resolutions of the Board or procedures
adopted by the Board at the time in force and applicable; and promptly to notify
the Fund, the proper exchange and the NASD or such other persons as the Fund may
request of the results of such computation and determination. In computing the
net asset value hereunder, the Bank may rely in good faith upon information
furnished to it by any Authorized Person in respect of (i) the manner of accrual
of the liabilities of the Fund and in respect of liabilities of the Fund not
appearing on its books of account kept by the Bank, (ii) reserves, if any,
authorized by the Board or that no such reserves have been authorized, (iii) the
source of the quotations to be used in computing the net asset value, (iv) the
value to be assigned to any security for which no price quotations are
available, and (v) the method of computation of the public offering price on the
basis of the net asset value of the shares, and the Bank shall not be
responsible for any loss occasioned by such reliance or, absent any negligence,
bad faith and willful misconduct by the  Bank, for any good faith reliance on
any quotations received from a source pursuant to (iii) above.

       12.2.  Yield Calculation.  The Bank will compute the performance results
              ------------------
of the Fund (the "Yield Calculation") in accordance with the provisions of
Release No. 33-6753 and Release No. IC-16245 (February 2, 1988) (the "Releases")
promulgated by the Securities and Exchange Commission, and any subsequent
amendments to, published interpretations of or general conventions accepted by
the staff of the Securities and Exchange Commission with respect to such
releases or the subject matter thereof ("Subsequent Staff Positions"), subject
to the terms set forth below:

              (a) The Bank shall compute the Yield Calculation for the Fund for
the stated periods of time as shall be mutually agreed upon, and communicate in
a timely manner the result of such computation to the Fund.

              (b) In performing the Yield Calculation, the Bank will derive the
items of data necessary for the computation from the records it generates and
maintains for the Fund pursuant Section 11 hereof. The Bank shall have no
responsibility to review, confirm, or otherwise assume any duty or liability
with respect to the accuracy or correctness of any such data supplied to it by
the Fund, any of the Fund's designated agents or any of the Fund's designated
third party providers, provided, however, the Bank shall promptly notify the
Fund if the Bank becomes aware that such data is, or may be, inaccurate or
incorrect.

              (c) At the request of the Bank, the Fund shall provide, and the
Bank shall be entitled to rely on, written standards and guidelines to be
followed by the Bank in interpreting and applying the computation methods set
forth in the Releases or any Subsequent Staff Positions as they specifically
apply to the Fund. In the event that the computation methods in the Releases or
the Subsequent Staff Positions or the application to the Fund of a standard or
guideline is not free from doubt or in the event

                                      14
<PAGE>

there is any question of interpretation as to the characterization of a
particular security or any aspect of a security or a payment with respect
thereto (e.g., original issue discount, participating debt security, income or
return of capital) or otherwise or as to any other element of the computation
which is pertinent to the Fund, the Fund or its designated agent shall have the
responsibility for making the determination of how the security or payment is to
be treated for purposes of the computation and how the computation is to be made
and shall inform the Bank thereof on a timely basis. The Bank shall have no
responsibility to make independent determinations with respect to any item which
is covered by this Section, and shall not be responsible for its computations
made in accordance with such determinations absent negligence, bad faith and
willful misconduct by the Bank in the performance of such computations.

              (d) The Fund shall keep the Bank informed of information and non-
public advice, or information obtained by the Fund from its independent auditors
or by its personnel or the personnel of its investment adviser, or Subsequent
Staff Positions related to the computations to be undertaken by the Bank
pursuant to this Agreement and the Bank shall not be deemed to have knowledge of
such non-public information (except as contained in the Releases) unless it has
been furnished to the Bank in writing.

      13.  Additional Services.  The Bank shall perform the additional services
           -------------------
for the Fund as are set forth on Appendix C hereto.  Appendix C may be amended
                                 ----------          ----------
from time to time upon agreement of the parties to include further additional
services to be provided by the Bank to the Fund, at which time the fees set
forth in Appendix B shall be appropriately increased.
         ----------

      14.  Duties of the Bank.
           ------------------

       14.1  Performance of Duties and Standard of Care.  In performing its
             ------------------------------------------
duties hereunder and any other duties listed on any Schedule hereto, if any, the
Bank will be entitled to receive and act upon the advice of independent counsel
of its own selection, which may be counsel for the Fund, and will be without
liability for any action taken or thing done or omitted to be done in accordance
with this Agreement in good faith in conformity with such advice.

     The Bank will be under no duty or obligation to inquire into and will not
be liable for:

              (a) the validity of the issue of any Portfolio Securities
purchased by or for the Fund, the legality of the purchases thereof or the
propriety of the price incurred therefor;

              (b) the legality of any sale of any Portfolio Securities by or for
the Fund or the propriety of the amount for which the same are sold;

              (c) the legality of an issue or sale of any common shares of the
Fund or the sufficiency of the amount to be received therefor;

              (d) the legality of the repurchase of any common shares of the
Fund or the propriety of the amount to be paid therefor;

              (e) the legality of the declaration of any dividend by the Fund or
the legality of the distribution of any Portfolio Securities as payment in kind
of such dividend; and

              (f) absent negligence, bad faith and willful misconduct by the
Bank, any property or moneys of the Fund unless and until received by it, and
any such property or moneys delivered or paid by it pursuant to the terms
hereof.

                                      15
<PAGE>

      Moreover, the Bank will not be under any duty or obligation to ascertain
whether any Portfolio Securities at any time delivered to or held by it for the
account of the Fund are such as may properly be held by the Fund under the
provisions of its Articles, By-laws, any federal or state statutes or any rule
or regulation of any governmental agency.

      14.2  Agents and Subcustodians with Respect to Property of the Fund Held
            ------------------------------------------------------------------
in the United States.  The Bank may employ agents of its own selection in the
- --------------------
performance of its duties hereunder and shall be responsible for the acts and
omissions of such agents as if performed by the Bank hereunder.  Without
limiting the foregoing, certain duties of the Bank hereunder may be performed by
one or more affiliates of the Bank.

      Upon receipt of Proper Instructions, the Bank may employ subcustodians
selected by or at the direction of the Fund, provided that any such subcustodian
meets at least the minimum qualifications required by Section 17(f)(1) of the
1940 Act to act as a custodian of the Fund's assets with respect to property of
the Fund held in the United States. The Bank shall have no liability to the Fund
or any other person by reason of any act or omission of any subcustodian
selected by or at the direction of the Fund and the Fund shall indemnify the
Bank and hold it harmless from and against any and all actions, suits and
claims, arising directly or indirectly out of the performance of any such
subcustodian. Upon request of the Bank, the Fund shall assume the entire defense
of any action, suit, or claim subject to the foregoing indemnity. The Fund shall
pay all fees and expenses of any subcustodian as provided in the fee schedule
attached as Appendix B hereto.
            ----------

      14.3  Duties of the Bank with Respect to Property of the Fund Held Outside
            --------------------------------------------------------------------
of the United States.
- --------------------

              (a) Appointment of Foreign Sub-Custodians. The Fund hereby
                  -------------------------------------
authorizes and instructs the Bank to employ as sub-custodians for the Fund's
Portfolio Securities and other assets maintained outside the United States the
foreign banking institutions and foreign securities depositories designated on
the Schedule attached hereto (each, a "Selected Foreign Sub-Custodian"). Upon
receipt of Proper Instructions, the Bank and the Fund may agree to designate
additional foreign banking institutions and foreign securities depositories to
act as Selected Foreign Sub-Custodians hereunder. Upon receipt of Proper
Instructions, the Fund may instruct the Bank to cease the employment of any one
or more such Selected Foreign Sub-Custodians for maintaining custody of the
Fund's assets, and the Bank shall so cease to employ such sub-custodian as soon
as alternate custodial arrangements have been implemented.

              (b) Foreign Securities Depositories. Except as may otherwise be
                  -------------------------------
agreed upon in writing by the Bank and the Fund, assets of the Fund shall be
maintained in foreign securities depositories only through arrangements
implemented by the foreign banking institutions serving as Selected Foreign Sub-
Custodians pursuant to the terms hereof. Where possible, such arrangements shall
include entry into agreements containing the provisions set forth in
subparagraph (d) hereof. Notwithstanding the foregoing, except as may otherwise
be agreed upon in writing by the Bank and the Fund, the Fund authorizes the
deposit in Euro-clear, the securities clearance and depository facilities
operated by Morgan Guaranty Trust Company of New York in Brussels, Belgium, of
Foreign Portfolio Securities eligible for deposit therein and the use of Euro-
clear in connection with settlements of purchases and sales of securities and
deliveries and returns of securities, until notified to the contrary pursuant to
subparagraph (a) hereunder.

              (c) Segregation of Securities. The Bank shall identify on its
                  -------------------------
books as belonging to the Fund the Foreign Portfolio Securities held by each
Selected Foreign Sub-Custodian. Each agreement pursuant to which the Bank
employs a foreign banking institution shall require that such institution

                                      16
<PAGE>

establish a custody account for the Bank and hold in that account Foreign
Portfolio Securities and other assets of the Fund, and, in the event that such
institution deposits Foreign Portfolio Securities in a foreign securities
depository, that it shall identify on its books as belonging to the Bank the
securities so deposited.

              (d) Agreements with Foreign Banking Institutions.  Each of the
                  --------------------------------------------
agreements pursuant to which a foreign banking institution holds assets of the
Fund (each, a "Foreign Sub-Custodian Agreement") shall be substantially in the
form provided to the Fund and shall provide that:  (a) the Fund's assets will
not be subject to any right, charge, security interest, lien or claim of any
kind in favor of the foreign banking institution or its creditors or agent,
except a claim of payment for their safe custody or administration (including,
without limitation, any fees or taxes payable upon transfers or reregistration
of securities); (b) beneficial ownership of the Fund's assets will be freely
transferable without the payment of money or value other than for custody or
administration (including, without limitation, any fees or taxes payable upon
transfers or reregistration of securities); (c) adequate records will be
maintained identifying the assets as belonging to the Bank; (d) officers of or
auditors employed by, or other representatives of the Bank, including to the
extent permitted under applicable law, the independent public accountants for
the Fund, will be given access to the books and records of the foreign banking
institution relating to its actions under its agreement with the Bank; and (e)
assets of the Fund held by the Selected Foreign Sub-Custodian will be subject
only to the instructions of the Bank or its agents.

              (e) Access of Independent Accountants of the Fund. Upon request of
                  ---------------------------------------------
the Fund, the Bank will use its best efforts to arrange for the independent
accountants of the Fund to be afforded access to the books and records of any
foreign banking institution employed as a Selected Foreign Sub-Custodian insofar
as such books and records relate to the performance of such foreign banking
institution under its Foreign Sub-Custodian Agreement.

              (f) Reports by Bank. The Bank will supply to the Fund from time to
                  ---------------
time, as mutually agreed upon, statements in respect of the securities and other
assets of the Fund held by Selected Foreign Sub-Custodians, including but not
limited to an identification of entities having possession of the Foreign
Portfolio Securities and other assets of the Fund and advice of any transfers of
assets into or out of the accounts of such Selected Foreign Sub-Custodians.

              (g) Transactions in Foreign Custody Account.  Transactions with
                  ---------------------------------------
respect to the assets of the Fund held by a Selected Foreign Sub-Custodian shall
be effected pursuant to Proper Instructions from the Fund to the Bank and shall
be effected in accordance with the applicable Foreign Sub-Custodian Agreement.

          Notwithstanding any provision of this Agreement to the contrary,
settlement and payment for Foreign Portfolio Securities received for the account
of the Fund and delivery of Foreign Portfolio Securities maintained for the
account of the Fund may be effected in accordance with the customary established
securities trading or securities processing practices and procedures in the
jurisdiction or market in which the transaction occurs, including, without
limitation, delivering securities to the purchaser thereof or to a dealer
therefor (or an agent for such purchaser or dealer) against a receipt with the
expectation of receiving later payment for such securities from such purchaser
or dealer.

          In connection with any action to be taken with respect to the Foreign
Portfolio Securities held hereunder, including, without limitation, the exercise
of any voting rights, subscription rights, redemption rights, exchange rights,
conversion rights or tender rights, or any other action in connection with any
other right, interest or privilege with respect to such Securities
(collectively, the "Rights"), the Bank shall promptly transmit to the Fund such
information in connection therewith as is

                                      17
<PAGE>

made available to the Bank by the Foreign Sub-Custodian, and shall promptly
forward to the applicable Foreign Sub-Custodian any instructions, forms or
certifications with respect to such Rights, and any instructions relating to the
actions to be taken in connection therewith, as the Bank shall receive from the
Fund pursuant to Proper Instructions. Notwithstanding the foregoing, absent its
own negligence, bad faith and willful misconduct, the Bank shall have no further
duty or obligation with respect to such Rights, including, without limitation,
the determination of whether the Fund is entitled to participate in such Rights
under applicable U.S. and foreign laws, or the determination of whether any
action proposed to be taken with respect to such Rights by the Fund or by the
applicable Foreign Sub-Custodian will comply with all applicable terms and
conditions of any such Rights or any applicable laws or regulations, or market
practices within the market in which such action is to be taken or omitted.

              (h) Liability of Selected Foreign Sub-Custodians. Each Foreign
                  --------------------------------------------
Sub-Custodian Agreement with a foreign banking institution shall require the
institution to exercise reasonable care in the performance of its duties and to
indemnify, and hold harmless, the Bank and the Fund from and against losses,
damages, costs, expenses, liabilities or claims arising out of or in connection
with the institution's performance of such obligations, all as set forth in the
applicable Foreign Sub-Custodian Agreement. The Bank shall grant the Fund a
right of subrogation with regard to the rights of the Bank as they affect the
Fund under any applicable Foreign Sub-Custodian Agreement. The Fund acknowledges
that the Bank, as a participant in Euro-clear, is subject to the Terms and
Conditions Governing the Euro-clear System, a copy of which has been made
available to the Fund. The Fund acknowledges that pursuant to such Terms and
Conditions, Morgan Guaranty Brussels shall have the sole right to exercise or
assert any and all rights or claims in respect of actions or omissions of, or
the bankruptcy or insolvency of, any other depository, clearance system or
custodian utilized by Euro-clear in connection with the Fund's securities and
other assets.

              (i) Tax Law. The Bank shall have no responsibility or liability
                  -------
for any obligations now or hereafter imposed on the Fund or the Bank as
custodian of the Fund by the tax laws of any jurisdiction, and it shall be the
responsibility of the Fund to notify the Bank of the obligations imposed on the
Fund, or its partners or the Bank as the custodian of the Fund by the tax law of
any non-U.S. jurisdiction, including responsibility for withholding and other
taxes, assessments or other governmental charges, certifications and
governmental reporting. The Selected Foreign Sub-custodian and the Bank shall
use reasonable efforts to assist the Fund with respect to any claim for
exemption or refund under the tax law of jurisdictions for which the Fund has
provided such information.

      14.4  Insurance.  The Bank shall use the same care with respect to the
            ---------
safekeeping of Portfolio Securities and cash of the Fund held by it as it uses
in respect of its own similar property and shall maintain such insurance
coverage as the Bank believes is prudent and adequate.

      14.5.  Fees and Expenses of the Bank.  The Fund will pay or reimburse the
             -----------------------------
Bank from time to time for any transfer taxes payable upon transfer of Portfolio
Securities made hereunder, and for all necessary proper disbursements, expenses
and charges made or incurred by the Bank in the performance of this Agreement
(including any duties listed on any Schedule hereto, if any). For the services
rendered by the Bank hereunder, the Fund will pay to the Bank such compensation
or fees at such rate and at such times as shall be agreed upon in writing by the
parties from time to time. The Bank will also be entitled to reimbursement by
the Fund for reasonable expenses incurred in conjunction with termination of
this Agreement.

      14.6  Advances by the Bank. The Bank may, in its sole discretion, advance
            --------------------
funds on behalf of the Fund to make any payment permitted by this Agreement upon
receipt of any proper authorization required by this Agreement for such payments
by the Fund. Should such a payment or payments, with

                                      18
<PAGE>

advanced funds, result in an overdraft (due to insufficiencies of the Fund's
account with the Bank, or for any other reason) this Agreement deems any such
overdraft or related indebtedness a loan made by the Bank to the Fund payable on
demand. Such overdraft shall bear interest at the current rate charged by the
Bank for such loans unless the Fund shall provide the Bank with agreed upon
compensating balances. The Fund agrees that the Bank shall have a continuing
lien and security interest to the extent of any overdraft or indebtedness or to
the extent required by law, whichever is greater, in and to any property at any
time held by it for the Fund's benefit or in which the Fund has an interest and
which is then in the Bank's possession or control (or in the possession or
control of any third party acting on the Bank's behalf). The Fund authorizes the
Bank, in the Bank's sole discretion, at any time to charge any overdraft or
indebtedness, together with interest due thereon, against any balance of account
standing to the credit of the appropriate Portfolio of the Fund on the Bank's
books.

15.  Limitation of Liability.
     -----------------------

      15.1  The Bank shall exercise reasonable care and shall act without
negligence, bad faith or willful misconduct in the performance of its duties and
obligations hereunder.  Notwithstanding anything in this Agreement to the
contrary, in no event shall the Bank or any of its officers, directors or
employees (collectively, the "Indemnified Parties") be liable to the Fund or any
third party, and the Fund shall indemnify and hold the Bank and the Indemnified
Parties harmless from and against any and all loss, damage, liability, actions,
suits, claims, costs and expenses, including legal fees, (a "Claim") arising as
a result of any act or omission of the Bank or any Indemnified Party under this
Agreement, except to the extent that any Claim results from the negligence,
willful misfeasance, willful misconduct or bad faith of the Bank or any
Indemnified Party.  Without limiting the foregoing, neither the Bank nor the
Indemnified Parties shall be liable for, and the Bank and the Indemnified
Parties shall be indemnified against, any Claim arising as a result of:

              (a) Any act or omission by the Bank or any Indemnified Party in
good faith reliance upon the terms of this Agreement, any Officer's Certificate,
Proper Instructions, resolution of the Board, telegram, telecopier, notice,
request, certificate or other instrument reasonably believed by the Bank to
genuine;

              (b) Any act or omission of any subcustodian selected by or at the
direction of the Fund;

              (c) Any act or omission of a Selected Foreign Sub-Custodian to the
extent which such Selected Foreign Sub-Custodian is not liable to the Bank
because such Selected Foreign Sub-Custodian acted in accordance the standards
applicable to custodians in the relevant market;

              (d) Any Corporate Action, distribution or other event related to
Portfolio Securities which, at the direction of the Fund, have not been
registered in the name of the Bank or its nominee;

              (e) Any Corporate Action requiring a Response for which the Bank
has not received Proper Instructions or obtained actual possession of all
necessary Securities, consents or other materials by 5:00 p.m. on the date
specified as the Response Deadline;

              (f) Any act or omission of any European Branch of a U.S. banking
institution that is the issuer of Eurodollar CDs in connection with any
Eurodollar CDs held by such European Branch;

                                      19
<PAGE>

              (g) Information relied on in good faith by the Bank and supplied
by any Authorized Person in connection with the calculation of (i) the net asset
value and public offering price of the shares of capital stock of the Fund or
(ii) the Yield Calculation; or

              (h) Acts of God, earthquakes, fires, floods, storms or other
disturbances of nature, epidemics, strikes, riots, nationalization,
expropriation, currency restrictions, acts of war, civil war or terrorism,
insurrection, nuclear fusion, fission or radiation, the interruption, loss or
malfunction of utilities, transportation or computers (hardware or software) and
computer facilities, the unavailability of energy sources and other similar
happenings or events beyond the reasonable control of the Bank. Notwithstanding
the foregoing, the Bank has and shall maintain appropriate back-up and disaster
recovery facilities and shall use it best efforts to provide all required
information and services hereunder to the Fund as soon as possible after any
such delay in performance.

      15.2  Notwithstanding anything to the contrary in this Agreement, in no
event shall the Bank or the Indemnified Parties be liable to the Fund or any
third party for any special, consequential or punitive damages hereunder.

     16.  Termination.
          -----------

      16.1  The term of this Agreement shall be three years commencing upon the
date hereof (the "Initial Term"), unless earlier terminated as provided herein.
After the expiration of the Initial Term, the term of this Agreement shall
automatically renew for successive one-year terms (each a "Renewal Term") unless
notice of non-renewal is delivered by the non-renewing party to the other party
no later than ninety days prior to the expiration of the Initial Term or any
Renewal Term, as the case may be.

              (a)  Either party hereto may terminate this Agreement prior to the
expiration of the Initial Term or any Renewal Term in the event the other party
violates any material provision of this Agreement, provided that the non-
violating party gives written notice of such violation to the violating party
and the violating party does not cure such violation within 90 days of receipt
of such notice.

              (b)  If a majority of the Board reasonably determines that the
performance of the Bank under this Agreement has been unsatisfactory, written
notice (the "Notice") of such determination setting forth the reasons for such
determination shall be provided to the Bank. Such determination shall be based
upon such information as the Board in its sole discretion elects to consider,
including the Bank's performance against the "Performance Goals" (as defined
below). In order to be effective, any Notice must be executed by two officers of
the Fund. The Bank shall, within sixty (60) days after receipt of the Notice,
either (i) correct the deficiencies listed in the Notice; or (ii) renegotiate
terms of this Agreement in a form satisfactory to the Fund. If the conditions of
the preceding sentence are not met within such sixty (60) day period, the Fund
may terminate this Agreement without additional action by the Fund's Board upon
an additional sixty (60) days written notice. For the purposes of this Section,
"Performance Goals" shall mean the performance goal criteria mutually agreed
between the parties. The parties agree to develop the initial Performance Goals
no later than June 30, 1999 and agree to periodically review the Performance
Goals for necessary updates due to changes in the nature or scope of services
provided hereunder.

      16.2  In the event of the termination of this Agreement, the Bank will
immediately upon receipt or transmittal, as the case may be, of notice of
termination, commence and prosecute diligently to completion the transfer of all
cash and the delivery of all Portfolio Securities duly endorsed and all records
maintained under Section 11 to the successor custodian when appointed by the
Fund.  The obligation of the Bank to deliver and transfer over the assets of the
Fund held by it directly to such

                                      20
<PAGE>

successor custodian will commence as soon as such successor is appointed and
will continue until completed as aforesaid. If the Fund does not select a
successor custodian within ninety (90) days from the date of delivery of notice
of termination the Bank may, subject to the provisions of subsection 16.3,
deliver the Portfolio Securities and cash of the Fund held by the Bank to a bank
or trust company of the Bank's own selection which meets the requirements of
Section 17(f)(1) of the 1940 Act and has a reported capital, surplus and
undivided profits aggregating not less than $2,000,000, to be held as the
property of the Fund under terms similar to those on which they were held by the
Bank, whereupon such bank or trust company so selected by the Bank will become
the successor custodian of such assets of the Fund with the same effect as
though selected by the Board. Thereafter, upon satisfactory completion of all
its duties and obligations hereunder, the Bank shall be released from any and
all obligations under this Agreement.

      16.3  Prior to the expiration of ninety (90) days after notice of
termination has been given, the Fund may furnish the Bank with an order of the
Fund advising that a successor custodian cannot be found willing and able to act
upon reasonable and customary terms and that there has been submitted to the
shareholders of the Fund the question of whether the Fund will be liquidated or
will function without a custodian for the assets of the Fund held by the Bank.
In that event the Bank will deliver the Portfolio Securities and cash of the
Fund held by it, subject as aforesaid, in accordance with one of such
alternatives which may be approved by the requisite vote of shareholders, upon
receipt by the Bank of a copy of the minutes of the meeting of shareholders at
which action was taken, certified by the Fund's Secretary and an opinion of
counsel to the Fund in form and content satisfactory to the Bank.  Thereafter,
upon satisfactory completion of all its duties and obligations hereunder, the
Bank shall be released from any and all obligations under this Agreement.

      16.4  The Fund shall reimburse the Bank for any reasonable out-of-pocket
expenses incurred by the Bank in connection with the termination of this
Agreement, such as fees for the transfer of the Funds' assets and records to a
successor custodian and fees for any special processing in connection with such
transfer.  The Fund shall not be liable for severance payments, retention
bonuses or termination bonuses to the Bank or its employees in connection with
the termination of this Agreement.

      16.5  At any time after the termination of this Agreement, the Fund may,
upon written request, have reasonable access to the records of the Bank relating
to its performance of its duties as custodian.

     17.  Confidentiality.  Both parties hereto agree than any non-public
          ---------------
information obtained hereunder concerning the other party is confidential and
may not be disclosed without the written consent of the other party, except as
may be required by applicable law or at the request of a governmental agency
having proper jurisdiction.  The parties further agree that a breach of this
provision would irreparably damage the other party and accordingly agree that
each of them is entitled, in addition to all  other remedies at law or in equity
to an injunction or injunctions without bond or other security to prevent
breaches of this provision.

     18.  Notices. Any notice or other instrument in writing authorized or
          -------
required by this Agreement to be given to either party hereto will be
sufficiently given if addressed to such party and delivered via (I) United
States Postal Service registered mail, (ii) telecopier with written
confirmation, (iii) hand delivery with signature to such party at its office at
the address set forth below, namely:

          (a)  In the case of notices sent to the Fund to:

               Allmerica Investment Trust
               440 Lincoln Street

                                      21
<PAGE>

               Worcester, MA 01653
               Attn:  President
               With a copy to:  Counsel

          (b)  In the case of notices sent to the Bank to:

               Investors Bank & Trust Company
               200 Clarendon Street, P.O. Box 9130
               Boston, Massachusetts 02117-9130
               Attention: Geoffrey O'Connell, Director - Client Management
               With a copy to:  John E. Henry, General Counsel

          or at such other place as such party may from time to time designate
in writing.

     19.  Amendments.  This Agreement may not be altered or amended, except by
          ----------
an instrument in writing, executed by both parties.

     20.  Parties.  This Agreement will be binding upon and shall inure to the
          -------
benefit of the parties hereto and their respective successors and assigns;
provided, however, that this Agreement will not be assignable by the Fund
without the written consent of the Bank or by the Bank without the written
consent of the Fund, authorized and approved by its Board; and provided further
that termination proceedings pursuant to Section 16 hereof will not be deemed to
be an assignment within the meaning of this provision.

     21.  Governing Law. This Agreement and all performance hereunder will be
          -------------
governed by the laws of the Commonwealth of Massachusetts, without regard to
conflict of laws provisions.

     22.  Counterparts.  This Agreement may be executed in any number of
          ------------
counterparts, each of which shall be deemed to be an original, but such
counterparts shall, together, constitute only one instrument.

     23.  Entire Agreement.  This Agreement, together with its Appendices,
          ----------------
constitutes the sole and entire agreement between the parties relating to the
subject matter herein and does not operate as an acceptance of any conflicting
terms or provisions of any other instrument and terminates and supersedes any
and all prior agreements and undertakings between the parties relating to the
subject matter herein.

     24.  Limitation of Liability.  A copy of the Agreement and Declaration of
          -----------------------
Trust of the Fund is on file with the Secretary of State of the Commonwealth of
Massachusetts, and notice is hereby given that this Agreement is executed by or
on behalf of the Fund by the Trustees as Trustees or by the officers as officers
and not individually, and that the obligations of this Agreement are not binding
upon any of the Trustees, officers or shareholders of the Fund, but are binding
only upon the assets and property of the Fund.  The parties hereto agree that no
shareholder, Trustee or officer of the Fund may be held personally liable or
responsible for any obligation of the Fund arising out of this Agreement.

     25.  Several Obligations of the Portfolios.  This Agreement is an agreement
          -------------------------------------
entered into between the Bank and the Fund with respect to each Portfolio.  With
respect to any obligation of the Fund on behalf of any Portfolio arising out of
this Agreement, the Bank shall look for payment or satisfaction of such
obligation solely to the assets of the Portfolio to which such obligation
relates as though the Bank had separately contracted with the Fund by separate
written instrument with respect to each Portfolio.

                                      22
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized as of the day
and year first written above.


                           ALLMERICA INVESTMENT TRUST


                           By: /s/ Richard M. Reilly
                               -----------------------------
                               Title:  President


                           INVESTORS BANK & TRUST COMPANY



                           By: /s/ Michael F. Rogers
                               -----------------------------
                               Title:  Executive Vice President

                                      23
<PAGE>

                                   Appendices
                                   ----------


Appendix A..........................................  Portfolios

Appendix B..........................................  Fee Schedule

Appendix C..........................................  Additional Services

                                      24
<PAGE>

                                   Appendix A
                                   ----------

                                   Portfolios


 .  Select Emerging Markets Fund
 .  Select Aggressive Growth Fund
 .  Select Capital Appreciation Fund
 .  Select Value Opportunity Fund
 .  Select International Equity Fund
 .  Select Growth Fund
 .  Select Strategic Growth Fund
 .  Growth Fund
 .  Equity Index Fund
 .  Select Growth and Income Fund
 .  Select Income Fund
 .  Investment Grade Income Fund
 .  Government Bond Fund
 .  Money Market Fund
<PAGE>

                                   Appendix B
                                   ----------
                           Allmerica Investment Trust
                                  Fee Schedule

================================================================================
              CUSTODY, FUND ACCOUNTING, CALCULATION OF N.A.V. and
                              FUND ADMINISTRATION
================================================================================

  A. Domestic Custody, Fund Accounting,  Calculation of N.A.V. and Fund
     ------------------------------------------------------------------
     Administration
     --------------

     The following fees will apply to all assets for which Investors Bank
     provides custody, fund accounting, calculation of N.A.V. and fund
     administration. This fee does not include transactions or global custody
     costs.

                                              Annual Fee
                                              ----------
     First $2 Billion of Net Assets           3.5 Basis Points
     Next $2Billion of Net Assets             2.5 Basis Points
     Assets in excess of $4 Billion           2.0 Basis Points

     The yearly minimum fee for each fund is $75,000. Future funds in addition
     to the 14 funds are subject to a $75,000 minimum fee.

B. Transactions
   ------------

     .    DTC/Fed Book Entry     $  8**
     .    Physical Securities      35
     .    Options and Futures      18
     .    GNMA Securities          30
     .    Principal Paydown         5
     .    Foreign Currency         18***
     .    Outgoing Wires            7
     .    Incoming Wires            5

**  Assumes trade information is sent electronically to Investors Bank in the
ISITC/SWIFT format.  Manual trades will be billed at $12.00 per trade.  There
are no transaction charges for use of the Investors Bank Repo.

*** There are no transaction charges for F/X contracts executed by Investors
Bank.

C. Foreign Subcustodian Fees
   -------------------------

     .  Incremental basis point and transaction fees will be charged for all
      foreign assets for which we are custodian.  The asset based fees and
      transaction fees vary by country, based upon the attached global custody
      fee schedule.  Local duties, script fees, registration, exchange fees, and
      other market charges are out-of-pocket.

                                       2
<PAGE>

     .  Investors Bank will require the fund to hold all international assets at
      the subcustodian of our choice.


================================================================================
                                 MISCELLANEOUS
================================================================================

  A. Out-of-Pocket
     -------------

     . These charges consist of:

       -Legal Expenses                     -Non Standard Extracts
       -Printing, Delivery & Postage       -Data Transmissions
       -Third Party Review                 -Forms & Supplies
       -Extraordinary Travel Expenses      -Micro Rental
       -Customized Systems                 -InvestView
         Development/Reports
       -Pricing and Verification services
       -Telecommunications
       -Financial Statement
         Printing/Edgarization
       -Support Equipment Rental

  B. Domestic Balance Credit
     -----------------------

     . We allow use of balance credit against fees (excluding out-of-pocket
       charges) for fund balances arising out of the custody relationship.  The
       credit is based on collected balances reduced by balances required to
       support the activity charges of the accounts.  The monthly earnings
       allowance is equal to 75% of the 90-day T-bill rate.

  C. Foreign Exchange, Cash Management and Securities Lending
     --------------------------------------------------------

     . This Fee Schedule assumes Investors Bank will perform foreign exchange,
       cash management and security lending services for the portfolios.
       Securities lending revenue is split with the portfolios and Investors
       Bank on a 60/40% basis: 60% going to the portfolio.  Securities lending
       revenue to AIT is estimated to be $750,000 per year based on current
       portfolios.

  D. Payment
     -------

     . The above fees will be charged against the fund's custodian checking
       account five business days after the invoice is mailed.


  E. Systems
     -------

     . The details of any systems work will be determined after a thorough
       business analysis.  System's work will be billed on a time and material
       basis.  Investors Bank provides an allowance of 10 systems hours for data
       extract set up and reporting extract set up.  Additional hours will be
       billed on a time and material basis.

                                       3
<PAGE>

  F. Term
     ----

     . The term of this Fee Schedule shall be three years commencing upon the
       date of conversion of the Company's assets to the Bank (the "Initial
       term").


*  This fee schedule is valid for 90 days from the date of issue.

*  This fee schedule is contingent on Investors Bank providing custody and
   related services for the Allmerica Separate Accounts, Allmerica Securities
   Trust and The Fulcrum Trust.

*  This fee schedule is confidential between Investors Bank and the Allmerica
   Investment Trust and shall not be disclosed to any third party without the
   written consent of both parties.

                                       4
<PAGE>

                                   Appendix C
                                   ----------

                              Additional Services


                                     None.


                                       5

<PAGE>

                                                                       Exhibit 8


                       ADMINISTRATION SERVICES AGREEMENT


                                    between


           ALLMERICA FINANCIAL INVESTMENT MANAGEMENT SERVICES, INC.,


                           ALLMERICA INVESTMENT TRUST


                                      and


                         INVESTORS BANK & TRUST COMPANY

<PAGE>

                       ADMINISTRATION SERVICES AGREEMENT


     AGREEMENT made as of April 1, 1999 by and among ALLMERICA FINANCIAL
INVESTMENT MANAGEMENT SERVICES, INC., a Massachusetts corporation ("AFIMS"),
ALLMERICA INVESTMENT TRUST (the "Fund") and INVESTORS BANK & TRUST COMPANY, a
Massachusetts trust company  (the "Bank").

     WHEREAS, AFIMS serves as investment manager for the Fund, a registered
investment company under the Investment Company Act of 1940, as amended (the
"1940 Act"), consisting of the separate portfolios listed on Appendix A hereto;
                                                             ----------
and

     WHEREAS, AFIMS desires to retain the Bank to render certain administrative
services to the Fund and the Bank is willing to render such services.

     NOW, THEREFORE, in consideration of the mutual covenants herein set forth,
it is agreed between the parties hereto as follows:

     1.   Appointment.
          ------------

          AFIMS hereby appoints the Bank to act as Administrator of the Fund on
the terms set forth in this Agreement.  The Bank accepts such appointment and
agrees to render the services herein set forth for the compensation herein
provided.

     2.   Delivery of Documents.
          ----------------------

          AFIMS has furnished the Bank with copies properly certified or
authenticated of each of the following:

          (a)  The Fund's incorporating or organizing documents filed with the
Commonwealth of Massachusetts on September 8, 1993 and all amendments thereto
(the "Articles");

          (b)  The Fund's by-laws and all amendments thereto (the "By-Laws");

          (c)  The Fund's agreements with all service providers which include
any investment advisory agreements, sub-investment advisory agreements, custody
agreements, distribution agreements and transfer agency agreements
(collectively, the "Agreements");

          (d)  The Fund's most recent amendment to its Registration Statement on
Form N-1A (the "Registration Statement") under the Securities Act of 1933 and
under the 1940 Act; and

          (e)  The Fund's most recent prospectus and statement of additional
information  (the "Prospectus"); and

          (f)  Such other certificates, documents or opinions as may mutually be
deemed necessary or appropriate for the Bank in the proper performance of its
duties hereunder.

          Upon request, AFIMS will promptly furnish, or cause to be furnished
the Bank copies of all amendments of or supplements to the foregoing.
Furthermore, each party to this Agreement will notify the other promptly of any
matter which may materially affect the performance by the Bank of its services
under this Agreement.

                                    Page 1
<PAGE>

     3.   Duties of Administrator.
          ------------------------

          Subject to the supervision and direction of the Board of Directors of
the Fund, the Bank, as Administrator, will assist in conducting various aspects
of the Fund's administrative operations and undertakes to perform the services
described in Appendix B hereto.  The Bank may, from time to time, perform
             ----------
additional duties and functions which shall be set forth in an amendment to such
Appendix B executed by both parties.  At such time, the fee schedule included in
- ----------
Appendix C hereto shall be appropriately amended.
- ----------

          In performing all services under this Agreement, the Bank shall act in
conformity with the Fund's Articles and By-Laws and the 1940 Act and other laws
as applicable, as the same may be amended from time to time, and the investment
objectives, investment policies and other practices and policies set forth in
the Fund's Registration Statement, as the same may be amended from time to time.
Notwithstanding any item discussed herein, the Bank has no discretion over the
Fund's assets or choice of investments.

     4.   Duties of the Fund.
          -------------------

          (a) The Fund agrees to make its legal counsel available to the Bank
for instruction with respect to any matter of law arising in connection with the
Bank's duties hereunder, and the Fund further agrees that the Bank shall be
entitled to rely on such instruction without further investigation on the part
of the Bank.

     5.   Fees and Expenses.
          ------------------

          (a)  For the services to be rendered and the facilities to be
furnished by the Bank, as provided for in this Agreement, AFIMS will compensate
the Bank in accordance with the fee schedule attached as Appendix C hereto.
                                                         ----------
Such fees do not include out-of-pocket disbursements (as delineated on the fee
schedule or other expenses with the prior approval of the Fund's management) of
the Bank for which the Bank shall be entitled to bill AFIMS separately and for
which AFIMS shall reimburse the Bank.

          (b)  The Bank shall not be required to pay any expenses incurred by
the Fund or AFIMS.

          (c)  This Agreement does not obligate the Fund to pay the Bank any
fees or disbursements as described under paragraph 5(a) above.

     6.   Limitation of Liability.
          ------------------------

          (a)  The Bank agrees to indemnify and hold AFIMS and its directors,
officers, employees, agents and representatives harmless from and against any
and all losses, damages, liabilities, claims, costs and expenses, including
reasonable attorneys' fees and expenses, resulting from any claim, demand,
action or suit arising out of the Bank's willful misfeasance, bad faith or gross
negligence in the performance of its obligations and duties under this
Agreement.

          (b)  AFIMS agrees to indemnify and hold the Bank and its directors,
officers, employees, agents and representatives harmless from and against any
and all losses, damages, liabilities, claims, costs, and expenses including
reasonable attorneys' fees and expenses, resulting from any claim, demand,
action or suit related to AFIMS's performance of, or failure to perform, its
obligations under this Agreement and not resulting from willful misfeasance, bad
faith or gross negligence of the Bank.

          (c)  The Bank may apply to AFIMS at any time for instructions and may
consult counsel for AFIMS, or its own counsel, Morgan, Lewis and Bockius, and
with accountants and other experts with respect to any matter arising in
connection with its duties hereunder, and the Bank shall not be liable or

                                    Page 2
<PAGE>

accountable for any action taken or omitted by it in good faith in accordance
with such instruction, or with the opinion of such counsel, accountants, or
other experts.  The Bank shall not be liable for any act or omission taken or
not taken in reliance upon any document, certificate or instrument which it
reasonably believes to be genuine and to be signed or presented by the proper
person or persons.  The Bank shall not be held to have notice of any change of
authority of any officers, employees, or agents of the Fund until receipt of
written notice thereof has been received by the Bank from the Fund.

          (d)  In the event the Bank is unable to perform, or is delayed in
performing, its obligations under the terms of this Agreement because of acts of
God, earthquakes, fires, floods, storms or other disturbances of nature,
epidemics, strikes, riots, nationalization, expropriation, currency
restrictions, acts of war, civil war or terrorism, insurrection, nuclear fusion,
fission or radiation, the interruption, loss or malfunction of utilities,
transportation or computers (hardware or software) and computer facilities, the
unavailability of energy sources and other similar happenings or events beyond
the reasonable control of the Bank, the Bank shall not be liable to the Fund or
AFIMS for any damages resulting from such failure to perform, delay in
performance, or otherwise from such causes.  Notwithstanding the foregoing, the
Bank has and shall maintain appropriate back-up and disaster recovery facilities
and shall use it best efforts to provide all required information and services
hereunder to the Fund and AFIMS as soon as possible after any such delay in
performance.


     7.   Term and Termination of Agreement.
                   ------------------------

          (a) The term of this Agreement shall be three years commencing upon
the date hereof (the "Initial Term"), unless earlier terminated as provided
herein.  After the expiration of the Initial Term, the term of this Agreement
shall automatically renew for successive one-year terms (each a "Renewal Term")
unless notice of non-renewal is delivered by the non-renewing party to the other
party no later than ninety days prior to the expiration of the Initial Term or
any Renewal Term, as the case may be.

              (i)  Either party hereto may terminate this Agreement prior to the
expiration of the Initial Term or any Renewal Term in the event the other party
violates any material provision of this Agreement, provided that the non-
violating party gives written notice of such violation to the violating party
and the violating party does not cure such violation within 90 days of receipt
of such notice.

              (ii) If a majority of the Fund's Board reasonably determines that
the performance of the Bank under this Agreement has been unsatisfactory,
written notice (the "Notice") of such determination setting forth the reasons
for such determination shall be provided to the Bank. Such determination shall
be based upon such information as the Fund's Board in its sole discretion elects
to consider, including the Bank's performance against the "Performance Goals"
(as defined below). In order to be effective, any Notice must be executed by two
officers of the Fund. The Bank shall, within sixty (60) days after receipt of
the Notice, either (i) correct the deficiencies listed in the Notice; or (ii)
renegotiate terms of this Agreement in a form satisfactory to the Fund. If the
conditions of the preceding sentence are not met within such sixty (60) day
period, the Fund may terminate this Agreement without additional action by the
Fund's Board upon an additional sixty (60) days written notice. For the purposes
of this Section, "Performance Goals" shall mean the performance goal criteria
mutually agreed between the parties. The parties agree to develop the initial
Performance Goals no later than June 30, 1999 and agree to periodically review
the Performance Goals for necessary updates due to changes in the nature or
scope of services provided hereunder.

                                    Page 3
<PAGE>

          (b)  At any time after the termination of this Agreement, the Fund or
AFIMS may, upon written request, have reasonable access to the records of the
Bank relating to its performance of its duties as Administrator.

     8.   Miscellaneous.
          --------------

          (a)  Any notice or other instrument authorized or required by this
Agreement to be given in writing to AFIMS or the Bank shall be sufficiently
given if addressed to that party and received by it at its office set forth
below or at such other place as it may from time to time designate in writing.

          To AFIMS:

               Allmerica Financial Investment Management Services, Inc.
               440 Lincoln Street
               Worcester, MA  01653
               Attention:  President
               With a copy to:  Counsel

          To the Fund:

               Allmerica Investment Trust
               440 Lincoln Street
               Worcester, MA  01653
               Attention:  President
               With a copy to:  Counsel

          To the Bank:

               Investors Bank & Trust Company
               200 Clarendon Street, P.O. Box 9130
               Boston, MA  02117-9130
               Attention:  Geoffrey M. O'Connell, Director, Client Management
               With a copy to:  John E. Henry, General Counsel

          (b)  This Agreement shall extend to and shall be binding upon the
parties hereto and their respective successors and assigns; provided, however,
that this Agreement shall not be assignable without the written consent of the
other party.

          (c)  This Agreement shall be construed in accordance with the laws of
the Commonwealth of Massachusetts, without regard to its conflict of laws
provisions.

          (d)  This Agreement may be executed in any number of counterparts each
of which shall be deemed to be an original and which collectively shall be
deemed to constitute only one instrument.

          (e)  The captions of this Agreement are included for convenience of
reference only and in no way define or limit any of the provisions hereof or
otherwise affect their construction or effect.

     9.   Confidentiality.
          ----------------

          All  books, records, information and data pertaining to the business
of the other party which are exchanged or received pursuant to the negotiation
or the carrying out of this Agreement shall remain confidential, and shall not
be voluntarily disclosed to any other person, except as may be required in the
performance of duties hereunder or as otherwise required by law.

                                    Page 4
<PAGE>

     10.  Use of Name.
          -----------

          AFIMS shall not use the name of the Bank or any of its affiliates in
any prospectus, sales literature or other material relating to the Fund in a
manner not approved by the Bank prior thereto in writing; provided however, that
the approval of the Bank shall not be required for any use of its name which
merely refers in accurate and factual terms to its appointment hereunder or
which is required by the Securities and Exchange Commission or any state
securities authority or any other appropriate regulatory, governmental or
judicial authority; provided further, that in no event shall such approval be
                    ----------------
unreasonably withheld or delayed.

     11.  Limitation of Liability.  A copy of the Agreement and Declaration of
          -----------------------
Trust of the Fund is on file with the Secretary of State of the Commonwealth of
Massachusetts, and notice is hereby given that this Agreement is executed by or
on behalf of the Fund by the Trustees as Trustees or by the officers as officers
and not individually, and that the obligations of this Agreement are not binding
upon any of the Trustees, officers or shareholders of the Fund, but are binding
only upon the assets and property of the Fund.  The parties hereto agree that no
shareholder, Trustee or officer of the Fund may be held personally liable or
responsible for any obligation of the Fund arising out of this Agreement.

             (The remainder of this page intentionally left blank.)

                                    Page 5
<PAGE>

     IN WITNESS WHEREOF,  the parties hereto have caused this instrument to be
duly executed and delivered by their duly authorized officers as of the date
first written above.


                              ALLMERICA INVESTMENT TRUST


                              By: /s/ Richard M. Reilly
                                  -----------------------------
                              Name:  Richard M. Reilly
                              Title:    President


                              ALLMERICA FINANCIAL INVESTMENT
                              MANAGEMENT SERVICES, INC.


                              By: /s/ Stephen W. Bright
                                  -----------------------------
                              Name:  Stephen W. Bright
                              Title:    Vice President


                              INVESTORS BANK & TRUST COMPANY


                              By: /s/ Michael F. Rogers
                                  -----------------------------
                              Name:  Michael F. Rogers
                              Title:    Executive Vice President


                                    Page 6
<PAGE>

                                   Appendices
                                   ----------


Appendix A.........................................  Portfolios

Appendix B.........................................  Services

Appendix C.........................................  Fee Schedule
<PAGE>

                                   Appendix A
                                   ----------

                                   Portfolios


 .  Select Emerging Markets Fund
 .  Select Aggressive Growth Fund
 .  Select Capital Appreciation Fund
 .  Select Value Opportunity Fund
 .  Select International Equity Fund
 .  Select Growth Fund
 .  Select Strategic Growth Fund
 .  Growth Fund
 .  Equity Index Fund
 .  Select Growth and Income Fund
 .  Select Income Fund
 .  Investment Grade Income Fund
 .  Government Bond Fund
 .  Money Market Fund
<PAGE>

                                   Appendix B
                                   ----------

                                    Services
<TABLE>
<CAPTION>

                                                                                                         Suggested Fund Auditor or
Function                              Investors Bank & Trust                    Allmerica                         Counsel
- --------------------------------  -----------------------------------   -------------------------------  ---------------------------

    MANAGEMENT REPORTING
 & TREASURY ADMINISTRATION
- --------------------------------
<S>                               <C>                                   <C>                               <C>
Monitor portfolio compliance in   Perform tests of certain specific     Continuously monitor portfolio    A/C - Provide consultation
accordance with the current       portfolio activity designed from      activity and Fund operations in   as needed on compliance
Prospectus and SAI.               provisions of the Fund's Prospectus   conjunction with 1940 Act,        issues.
                                  and SAI.  Follow-up on potential      Prospectus, SAI and any other
                                  violations.                           applicable laws and regulations.
                                                                        Monitor testing results and
                                                                        approve resolution of compliance
Frequency:  Daily                                                       issues.

Provide compliance summary        Provide a report of compliance        Review report.                    A/C - Provide consultation
package.                          testing results.                                                        as needed.

Frequency:  Monthly

Perform asset diversification     Perform asset diversification tests   Continuously monitor portfolio    A - Provide consultation
testing to establish              at each tax quarter end.  Follow-up   activity in conjunction with      as needed in establishing
qualification as a RIC and to     on issues.                            IRS requirements.  Review test    positions to be taken in
meet requirements of Section                                            results and take any necessary    tax treatment of
817(h).                                                                 action.  Approve tax positions    particular issues. Review
                                                                        taken.                            quarter end tests on a
Frequency:  Quarterly                                                                                     current basis.
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                                                                                       Suggested Fund Auditor or
Function                                  Investors Bank & Trust               Allmerica                        Counsel
- ------------------------------------      ------------------------------------------------------------------------------------------

      MANAGEMENT REPORTING
& TREASURY ADMINISTRATION (CONT.)
- ------------------------------------
<S>                                       <C>                            <C>                          <C>
Perform qualifying income testing to      Perform qualifying income      Continuously monitor         A- Consult as needed on tax
 establish qualification as a RIC.        testing (on book basis         portfolio activity in        accounting positions to be
                                          income, unless material        conjunction with IRS         taken. Review in conjunction
                                          differences are anticipated)   requirements. Review test    with year-end audit.
                                          on quarterly basis and as      results and take any
                                          may otherwise be necessary.    necessary action. Approve
                                          Follow-up on issues.           tax positions taken.

Frequency:  Quarterly

Prepare the Fund's annual expense         Prepare preliminary expense    Provide asset level
 budget.  Establish daily accruals.       budget. Notify fund            projections. Approve
                                          accounting of new accrual      expense budget.
                                          rates.
Frequency:  Annually

Monitor the Fund's expense budget.        Monitor actual expenses        Provide asset level          C/A - Provide consultation as
                                          updating budgets/expense       projections quarterly.       requested.
                                          accruals.                      Provide vendor information
                                                                         as necessary. Review expense
                                                                         analysis and approve budget
                                                                         revisions.
</TABLE>

Frequency:  Monthly

<PAGE>

<TABLE>
<CAPTION>
                                                                                                        Suggested Fund Auditor
Function                                     Investors Bank & Trust               Allmerica                    or Counsel
- ------------------------------------      ------------------------------------------------------------------------------------------

      MANAGEMENT REPORTING
& TREASURY ADMINISTRATION (CONT.)
- ------------------------------------
<S>                                         <C>                              <C>                        <C>
Receive and coordinate payment of fund       Propose allocations of          Approve invoices and
 expenses.                                   invoice among Funds and         allocations of payments.
                                             obtain authorized approval      Send invoices to IBT in a
                                             to process payment.             timely manner.

Frequency:  As often as necessary

Calculate periodic dividend rates to be      Calculate amounts available     Establish and maintain           C -  Review dividend
declared in accordance with management       for distribution. Coordinate    dividend and distribution        resolutions in
guidelines.                                  review by management and/or     policies. Approve                conjunction with Board

                                             auditors. Notify custody and    distribution rates per share     approval.
                                             transfer agent of authorized    and aggregate amounts.
                                             dividend rates in accordance    Obtain Board approval when       A - Review and concur
                                             with Board approved policy.     required.                        with proposed
                                             Report dividends to Board as                                     distributions
                                             required.


Frequency:  Quarterly/Annually
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

                                                                                                        Suggested Fund Auditor
Function                                     Investors Bank & Trust               Allmerica                    or Counsel
- ------------------------------------      ------------------------------------------------------------------------------------------

       MANAGEMENT REPORTING
& TREASURY ADMINISTRATION (CONT.)
- -----------------------------------
<S>                                          <C>                             <C>                        <C>
Calculate total return information           Provide total return            Review total return
on Funds as defined in the current           calculations.                   information.
Prospectus and SAI.

Frequency:  Monthly

Prepare responses to major industry          Prepare, coordinate as          Identify the services to
questionnaires.                              necessary, and submit           which the Funds report.
                                             responses to the appropriate    Provide information as
                                             agency.                         requested.
Frequency:  As often as necessary

Prepare disinterested trustee Form           Summarize amounts paid to       Provide social security
1099-Misc.                                   trustees during the calendar    numbers and current mailing
                                             year.  Prepare and mail Form    address for trustees.
                                             1099-Misc.                      Review and approve
Frequency:  Annually                                                         information provided for
                                                                             Form 1099-Misc.
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
                                                                                                            Suggested Fund Auditor
Function                                     Investors Bank & Trust                 Allmerica                        or Counsel

FINANCIAL REPORTING
- ------------------------------------      ------------------------------------------------------------------------------------------

<S>                                          <C>                             <C>                            <C>
Prepare financial information for            Prepare selected portfolio      Review financial
presentation to Fund Management and          and financial information       information.
Board of Directors.                          for inclusion in board
                                             material.


Frequency:  Quarterly

Coordinate the annual audit and              Coordinate the creation of      Provide past financial           A - Perform audit and
semi-annual preparation and printing of      templates reflecting            statements and other             issue opinion on
financial statements and notes with          client-selected standardized    information required to          annual financial
management, fund accounting and the          appearance and text of          create templates, including      statements.
fund auditors.                               financial statements and        report style and graphics.
                                             footnotes. Draft and manage     Approve format and text as       A/C - Review reports.
                                             production cycle. Coordinate    standard. Approve production
                                             with IBT fund accounting the    cycle and assist in managing
                                             electronic receipt of           to the cycle. Coordinate
                                             portfolio and general ledger    review and approval by
                                             information. Assist in          portfolio managers of
                                             resolution of accounting        portfolio listings to be
                                             issues. Using templates,        included in financial
                                             draft financial statements,     statements. Prepare
                                             coordinate auditor and          appropriate management
                                             management review, and clear    letter and coordinate
                                             comments. Coordinate            production of Management
                                             printing of reports and         Discussion and Analysis. Review
                                             EDGAR conversion with           and approve entire report. Make
                                             outside printer and filing      appropriate representations in
                                             with the SEC via EDGAR.         conjunction with audit.

Frequency:  Annually/semi-annually
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
                                                                                                             Suggested Fund Auditor
Function                                     Investors Bank & Trust                   Allmerica                    or Counsel
- ------------------------------------      ------------------------------------------------------------------------------------------

LEGAL
- ------------------------------------
<S>                                          <C>                             <C>                              <C>
Prepare and file Form N-SAR.                 Prepare form for filing.        Provide appropriate responses.   C - Review initial
                                             Obtain any necessary            Provide applicable Exhibits to   filing. A - Provide
                                             supporting documents. File      attach to filing. Review and     annual audit internal

                                             with SEC via EDGAR.             authorize filing.                control letter to
                                                                                                              accompany the annual
                                                                                                              filing.
Frequency:  Semi-annually

Assist the preparation and filing of         Accumulate capital stock        Review and approve capital       A/C - Review
Form 24f-2 Notice.                           information.                    stock worksheet.                 informally when
                                                                                                              requested

Frequency:  Annually

Respond to regulatory audits.                Compile and provide             Coordinate with regulatory       C - Provide
                                             documentation pursuant to       auditors to provide requested    consultation as
                                             Assist audit requests. client   documentation and resolutions    needed.
                                             in resolution of audit          to inquiries.
                                             inquiries.
Frequency:  As needed (at least annually)
</TABLE>



<PAGE>

<TABLE>
<CAPTION>
                                                                                                            Suggested Fund Auditor
Function                                    Investors Bank & Trust                   Allmerica                   or Counsel
- ------------------------------------      ------------------------------------------------------------------------------------------

TAX
- ------------------------------------
<S>                                      <C>                             <C>                           <C>
Prepare income tax provisions.           Calculate investment company    Provide transaction           A - Provide consultation as
                                         taxable income, net tax         information as requested.     needed in establishing
                                         exempt interest, net capital    Identify Passive Foreign      positions to be taken in tax
                                         gain and spillback dividend     Investment Companies          treatment of particular
                                         requirements. Identify          (PFICs). Approve tax          issues. Perform review in
                                         book-tax accounting             accounting positions to be    conjunction with the
                                         differences. Track required     taken. Approve provisions.    year-end audit.
                                         information relating to
                                         accounting differences.

Frequency:  Annually
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                                                                                            Suggested Fund Auditor
Function                                    Investors Bank & Trust                  Allmerica                     or Counsel
- ------------------------------------      ------------------------------------------------------------------------------------------

TAX (CONT.)
- ------------------------------------
<S>                                       <C>                          <C>                                 <C>
Calculate excise tax distributions        Calculate required           Provide transaction information     A - Provide consultation
                                          distributions to avoid       as requested. Identify Passive      as needed in establishing
                                          imposition of excise tax.    Foreign Investment Companies        positions to be taken in
                                           - Calculate capital         (PFICs). Approve tax                tax treatment of
                                             gain net income and       accounting positions to be          particular issues.
                                             foreign currency          taken. Review and approve all       Review and concur with
                                             gain/loss through         income and distribution             proposed distributions
                                             October 31.               calculations, including             per share.
                                           - Calculate ordinary        projected income and dividend
                                             income and                shares. Approve distribution
                                             distributions             rates per share and aggregate
                                             through a specified       amounts. Obtain Board approval
                                             cut off date .            when required.
                                           - Project ordinary
                                             income from cut off
                                             date to December 31.
                                           - Ascertain dividend
                                           shares.
                                          Identify book-tax accounting
                                          differences. Track required
                                          information relating to
                                          accounting differences.
                                          Coordinate review by
                                          management and fund
                                          auditors. Notify custody and
                                          transfer agent of authorized
                                          dividend rates in accordance
                                          with Board approved policy.
                                          Report dividends to Board as
                                          required.

Frequency:  Annually
</TABLE>
<PAGE>

<TABLE>
<CAPTION>

Function                                     Investors Bank & Trust                     Allmerica                   or Counsel
- ------------------------------------      ------------------------------------------------------------------------------------------

TAX (CONT.)
- ------------------------------------
<S>                                    <C>                                     <C>                           <C>
Prepare tax returns                    Prepare excise and RIC tax returns.     Review and sign tax return.   A - Review and sign tax
                                                                                                             return as preparer.


Frequency:  Annually


Prepare Form 1099                      Obtain yearly distribution              Review and approve
                                       information.  Calculate 1099            information provided for
                                       reclasses and coordinate with           Form 1099.
                                       transfer agent.
Frequency:  Annually


Prepare other year-end tax-related     Obtain yearly income distribution       Review and approve
disclosures                            information.  Calculate disclosures     information provided.
                                       (i.e., dividend received deductions,
                                       foreign tax credits, tax-exempt
                                       income, income by jurisdiction) and
                                       coordinate with transfer agent.

Frequency:  Annually
</TABLE>
<PAGE>

                                  Appendix C
                                  ----------

                          Allmerica Investment Trust
                          --------------------------

                                 Fee Schedule

- --------------------------------------------------------------------------------
              CUSTODY, FUND ACCOUNTING, CALCULATION OF N.A.V. and
                              FUND ADMINISTRATION
- --------------------------------------------------------------------------------


A. Domestic Custody, Fund Accounting,  Calculation of N.A.V. and Fund
   ------------------------------------------------------------------
     Administration
     ----------------

     The following fees will apply to all assets for which Investors Bank
     provides custody, fund accounting, calculation of N.A.V. and fund
     administration. This
     fee does not include transactions or global custody costs.

                                                  Annual Fee
                                                  ----------
     First $2 Billion of Net Assets               3.5 Basis Points
     Next $2Billion of Net Assets                 2.5 Basis Points
     Assets in excess of $4 Billion               2.0 Basis Points

     The yearly minimum fee for each fund is $75,000. Future funds in addition
     to the 14 funds are subject to a $75,000 minimum fee.


B. Transactions
   ------------
     .    DTC/Fed Book Entry      $ 8**
     .    Physical Securities      35
     .    Options and Futures      18
     .    GNMA Securities          30
     .    Principal Paydown         5
     .    Foreign Currency         18***
     .    Outgoing Wires            7
     .    Incoming Wires            5

** Assumes trade information is sent electronically to Investors Bank in the
ISITC/SWIFT format.  Manual trades will be billed at $12.00 per trade.  There
are no transaction charges for use of the Investors Bank Repo.

***There are no transaction charges for F/X contracts executed by Investors
Bank.


<PAGE>

C. Foreign Subcustodian Fees
   -------------------------

     .    Incremental basis point and transaction fees will be charged for all
          foreign assets for which we are custodian. The asset based fees and
          transaction fees vary by country, based upon the attached global
          custody fee schedule. Local duties, script fees, registration,
          exchange fees, and other market charges are out-of-pocket.

     .    Investors Bank will require the fund to hold all international assets
          at the subcustodian of our choice.

- --------------------------------------------------------------------------------
                                 MISCELLANEOUS
- --------------------------------------------------------------------------------

  A. Out-of-Pocket
     -------------

     .    These charges consist of:

          -Legal Expenses                               -Non Standard Extracts
          -Printing, Delivery & Postage                 -Data Transmissions
          -Third Party Review                           -Forms & Supplies
          -Extraordinary Travel Expenses                -Micro Rental
          -Customized Systems Development/Reports       -InvestView
          -Pricing and Verification services
          -Telecommunications
          -Financial Statement Printing/Edgarization
          -Support Equipment Rental


  B. Domestic Balance Credit
     -----------------------

     .    We allow use of balance credit against fees (excluding out-of-pocket
          charges) for fund balances arising out of the custody relationship.
          The credit is based on collected balances reduced by balances required
          to support the activity charges of the accounts. The monthly earnings
          allowance is equal to 75% of the 90-day T-bill rate.


  C. Foreign Exchange, Cash Management and Securities Lending
     --------------------------------------------------------

     .    This Fee Schedule assumes Investors Bank will perform foreign
          exchange, cash management and security lending services for the
          portfolios. Securities lending revenue is split with the portfolios
          and Investors Bank on a 60/40% basis: 60% going to the portfolio.
          Securities lending revenue to AIT is estimated to be $750,000 per year
          based on current portfolios.

  D. Payment
     -------

     .    The above fees will be charged against the fund's custodian checking
          account five business days after the invoice is mailed.
<PAGE>

  E. Systems
     -------

     .    The details of any systems work will be determined after a thorough
          business analysis. System's work will be billed on a time and material
          basis. Investors Bank provides an allowance of 10 systems hours for
          data extract set up and reporting extract set up. Additional hours
          will be billed on a time and material basis.


  F. Term
     ----

     .    The term of this Fee Schedule shall be three years commencing upon the
          date of conversion of the Company's assets to the Bank (the "Initial
          term").


*    This fee schedule is valid for 90 days from the date of issue.

*    This fee schedule is contingent on Investors Bank providing custody and
     related services for the Allmerica Separate Accounts, Allmerica Securities
     Trust and The Fulcrum Trust.

*    This fee schedule is confidential between Investors Bank and the Allmerica
     Investment Trust and shall not be disclosed to any third party without the
     written consent of both parties.

<PAGE>

                                                                    EXhibit 8(a)


                      SECURITIES LENDING AGENCY AGREEMENT
                                    BETWEEN
                         INVESTORS BANK & TRUST COMPANY
                                      AND
                           ALLMERICA INVESTMENT TRUST
<PAGE>

     AGREEMENT, dated as of April 1, 1999, between Allmerica Investment Trust on
                                                   --------------------------
behalf of the Portfolios listed on Schedule A, (the "Lender"), and Investors
Bank & Trust Company, a trust company organized and existing under the laws of
the Commonwealth of Massachusetts (the "Bank").

     WHEREAS, the Bank currently acts as custodian for securities held by it in
the Account (as defined below) from time to time on behalf of the Lender; and

     WHEREAS, the Lender desires to appoint the Bank as its agent for the
purpose of lending securities in the Account as more fully set forth below; and

     WHEREAS, the Bank has agreed to act as the Lender's agent for such purpose
pursuant to the terms hereof;

     NOW, THEREFORE, for and in consideration of the mutual promises set forth
herein, the parties hereto agree as follows:

1.  Definitions.
    -----------

     Whenever used in this Agreement, unless the context otherwise requires, the
following words shall have the meanings set forth below:

     1.1 "Account" shall mean the custodial account or accounts established and
maintained by the Bank on behalf of the Lender for the safekeeping of securities
and monies received by the Bank from time to time.

     1.2 "Approved Investment" shall mean any type of security, participation or
interest in property in which Cash Collateral may be invested or reinvested, as
set forth on Schedule I hereto (which may be amended from time to time to add
additional Approved Investments with the written consent of the Bank and the
Lender, or to delete any Approved Investment at the written direction of the
Lender).

     1.3 "Authorized Person" shall be any officer of the Lender and any other
person, whether or not any such person is an officer or employee of the Lender,
duly authorized by corporate resolutions of the Board of Directors or Trustees,
as the case may be, of the Lender to give Oral and/or Written Instructions on
behalf of the Lender, such persons to be designated in a Certificate which
contains a specimen signature of such person.

     1.4 "Book-Entry System" shall mean the Federal Reserve/Treasury book-entry
system for receiving and delivering Government Securities (as defined herein)
and its successors and nominees.

     1.5 "Borrower" shall mean any entity named on Schedule II hereto (as such
Schedule may be amended from time to time to add additional Borrowers with the
written consent of the Bank and the Lender, or to delete any Borrower at the
written direction of the Lender) or any affiliate of such named entity, provided
that if the Bank enters into a transaction with an affiliate of any named
Borrower, the Bank shall notify the Lender of such transaction promptly.

     1.6 "Cash Collateral" shall mean either Fed funds or New York Clearing
House funds (next day funds), as applicable for a particular loan of Securities.
<PAGE>

     1.7  "Certificate" shall mean any notice, instruction, schedule or other
instrument in writing, authorized or required by this Agreement to be given to
the Bank, which is actually received by the Bank and signed on behalf of the
Lender by an Authorized Person or a person reasonably believed by the Bank to be
an Authorized Person.

     1.8  "Collateral" shall mean Cash Collateral unless the Bank and the Lender
have agreed in writing to additional collateral, including Government Securities
and Letters of Credit, in which case "Collateral" shall mean cash collateral and
such additional collateral

     1.9  "Collateral Account" shall mean an account established and maintained
by the Bank for the purpose of holding Collateral, Cash Collateral and Approved
Investments, interest, dividends and other payments and distributions received
with respect to Collateral and Approved Investments ("Distributions"), and any
Securities Loan Fee paid by Borrowers in connection with Securities loans
hereunder.

     1.10 "Depository" shall mean the Depository Trust Company, Participant's
Trust Company, Euroclear, and any other securities depository or clearing agency
(and their respective successors and nominees) authorized under applicable law
or regulation to act as a securities depository or clearing agency, as set forth
on Schedule IV hereto.

     1.11 "Government Security" shall mean book-entry Treasury securities (as
defined in Subpart 0 of Treasury Department Circular No. 300, 31 C.F.R. 306) and
any other securities issued or fully guaranteed by the United States government
or any agency or instrumentality of the United States government.

     1.12 "Letter of Credit" shall mean a clean, unconditional and irrevocable
letter of credit in favor of the Bank as agent for the Lender issued by a bank
named on Schedule III hereto as may be amended from time to time to add
additional banks by the written consent of the parties hereto, or to delete any
Bank at the written direction of the Lender.

     1.13 "Oral Instructions" shall mean verbal instructions actually received
by the Bank from an Authorized Person or from a person reasonably believed by
the Bank to be an Authorized Person.

     1.14 "Rebate" shall mean the amount payable by the Lender to a Borrower (as
set forth in a Receipt) in connection with Securities loans at any time
collateralized by Cash Collateral.

     1.15 "Receipt" shall mean an advice or confirmation setting forth the terms
of a particular loan of Securities hereunder, including, without limitation, the
Collateral with respect to such loan.

     1.16 "Securities Borrowing Agreement" shall mean with, respect to any
Borrower, the agreement pursuant to which the Bank lends securities on behalf of
its customers (including the Lender) to such Borrower as may be amended from
time to time.

     1.17 "Securities Loan Fee" shall mean the amount payable by a Borrower to
the Bank pursuant to the applicable Securities Borrowing Agreement in connection
with Securities loans, if any, collateralized by Collateral other than Cash
Collateral.

     1.18 "Security" shall mean any Government Securities, non-U.S. securities,
common stock and other equity securities, bonds, debentures, corporate debt
securities, notes, mortgages or other

                                       2
<PAGE>

obligations, and any certificates, warrants or other instruments representing
rights to receive, purchase, or subscribe for the same, or evidencing or
representing any other rights or interests therein, which are available for
lending pursuant to Section 2.2 of this Agreement.

     1.19 "Written Instructions" shall mean written communications actually
received by the Bank from an Authorized Person or from a person reasonably
believed by the Bank to be an Authorized Person by letter, memorandum, telegram,
cable, telex, telecopy facsimile, computer, video (CRT) terminal or other on-
line system, or any other method whereby the Bank is able to verify with a
reasonable degree of certainty the identity of the sender of such communications
or the sender is required to provide a password or other identification code.

2.  Appointment; Scope of Agency Authority.
    --------------------------------------

     2.1 Appointment. The Lender hereby appoints the Bank as its agent to lend
         -----------
Securities in the Account to Borrowers from time to time as hereinafter set
forth, and the Bank hereby accepts appointment as such agent and agrees to so
act.  As agent for the Lender, the Bank shall, from time to time, loan
Securities to Borrowers in accordance with the applicable Securities Borrowing
Agreements.  Lending transactions shall be allocated among the Bank's various
securities lending clients as provided by the Bank's securities lending software
systems.  The Bank has provided to the Lender a copy of a letter from the law
firm of Townley & Updike regarding the allocation methodology of the Bank's
securities lending software system.

     2.2 Securities Subject to Lending. Unless the Lender provides otherwise in
         -----------------------------
writing to the Bank, all Securities maintained in the Account shall be available
for lending pursuant to this Agreement.  If any Securities become subject to
pledge or hypothecation to a third party for any reason, including future and
option transactions, the Lender shall notify the Bank immediately that such
Securities are not available for lending hereunder.  The Bank shall monitor the
market value of the Lender's assets in order to ensure that no more than 33% of
the Lender's assets are subject to loan hereunder at any time.  If, due to a
change in the assets or liabilities of the Lender, the amount of Securities
loaned hereunder exceeds 33% of the Lender's assets, the Bank shall take
immediate steps to reduce the amount of Securities loaned hereunder to less than
33% of the Lender's assets.

     2.3 Securities Borrowing Agreement. The Lender hereby acknowledges receipt
         ------------------------------
of a Securities Borrowing Agreement with respect to each Borrower and authorizes
the Bank to lend Securities in the Account to Borrowers pursuant to such
agreements. The Bank shall promptly provide the Lender with copies of any
material amendments or changes to such agreements.  The Lender may elect to
terminate any Borrower from Schedule II at any time for any reason.

     2.4 Loan Opportunities. The Lender acknowledges and agrees that the Bank
         ------------------
shall have the right to decline to make any loans of Securities under any
Securities Borrowing Agreement and to discontinue lending under any Securities
Borrowing Agreement in its sole discretion and without notice to the Lender. The
Lender agrees that, provided the Bank acts in good faith without negligence and
willful misconduct, it shall have no claim against the Bank based on, or
relating to, loans made for other customers or for the Bank's own account, or
loan opportunities refused hereunder, whether or not the Bank has made fewer or
more loans for any other customer or for the Bank's own account than for the
Lender, and whether or not any loan for another customer or for the Bank's own
account, or the opportunity refused, could have resulted in loans made
hereunder.

     2.5 Use of Book-Entry System and Depositories. The Lender hereby authorizes
         -----------------------------------------
the Bank on a continuous and on-going basis, to deposit in the Book-Entry System
and the applicable Depositories set

                                       3
<PAGE>

forth on Schedule IV hereto all Securities eligible for deposit therein and to
utilize the Book-Entry System and Depositories to the extent possible in
connection with its receipt and delivery of Securities, Collateral, Approved
Investments and monies under this Agreement. Where Securities, Collateral (other
than Cash Collateral) and Approved Investments eligible for deposit in the Book-
Entry System or a Depository are transferred to the Account, the Bank shall
identify as belonging to the Lender the appropriate quantity of securities in a
fungible bulk of securities shown on the Bank's account on the books of the
Book-Entry System or the applicable Depository. Securities, Collateral and
Approved Investments deposited in the Book-Entry System or a Deposit will be
represented in accounts which include only assets held by the Bank for
customers, including but not limited to accounts in which the Bank acts in a
fiduciary or agency capacity.

3. Representations and Warranties.
   ------------------------------

     3.1  Lender's Representations  The Lender hereby represents and warrants to
          ------------------------
the Bank, which representations and warranties shall be deemed to be continuing
and to be reaffirmed on any day that a Securities loan hereunder is outstanding,
that:

             (a) This Agreement is, and each Securities loan and Approved
Investment will be, legally and validly entered into by the Lender, does not,
and will not, violate any statute, regulation, rule, order or, judgment binding
on the Lender, or any provision of the Lender's charter or by-laws, or any
agreement binding on the Lender or affecting its property, and is enforceable
against the Lender in accordance with its terms, except as may be limited by
bankruptcy, insolvency or similar laws, or by equitable principles relating to
or limiting creditors rights generally;

             (b) The person executing this Agreement and all Authorized Persons
acting on behalf of the Lender has and have been duly and properly authorized to
do so;

             (c) It is lending Securities as principal for its own account and
it will not transfer, assign or encumber its interest in, or rights with respect
to, any securities loans;

             (d) All Securities subject to lending pursuant to Section 2.2 of
this Agreement are free and clear of all liens, claims, security interests and
encumbrances, no such Security subject to lending has been sold and the Lender
has no present intention to sell any of the Securities subject to lending. The
Lender shall promptly delete from the list referenced in Section 2.2 hereof any
and all Securities which are no longer subject to the representations contained
in this sub-paragraph (d).

     3.2 Bank's Representations  The Bank hereby represents and warrants to the
         ----------------------
Lender, which representations and warranties shall be deemed to be continuing
and to be reaffirmed on any day that a Securities loan hereunder is outstanding,
that:

             (a) This Agreement is legally and validly entered into by the Bank,
does not and will not, violate any statute, regulation, rule, order or, judgment
binding on the Bank, or any provision of the Bank's charter or by-laws, or any
agreement binding on the Bank or affecting its property, and is enforceable
against the Bank in accordance with its terms, except as may be limited by
bankruptcy, insolvency or similar laws, or by equitable principles relating to
or limiting creditors rights generally; and

             (b) The person executing this Agreement on behalf of the Bank has
been duly and properly authorized to do so.

4. Securities Lending Transactions.
   -------------------------------

                                       4
<PAGE>

     4.l Loan Initiation. From time to time the Bank may lend Securities to
         ---------------
Borrowers and deliver such Securities against receipt of Collateral in
accordance with the applicable Securities Borrowing Agreement.

     4.2 Receipt of Collateral; Approved Investments.
         -------------------------------------------

             (a) For each loan hereunder the Bank shall receive all Collateral
required by the applicable Securities Borrowing Agreement, which for Cash
Collateral shall in no event be equivalent to less than 102% of the market value
of the Securities lent (as determined in accordance with the applicable
Securities Borrowing Agreement), and the Bank is hereby authorized and directed,
without obtaining any further approval from the Lender, to invest and reinvest
all or substantially all of the Cash Collateral received in any Approved
Investment. The Bank shall credit all Collateral, Approved Investments and
Distributions received with respect to Collateral and Approved Investments to
the Collateral Account and mark its books and records to identify the Lender's
ownership thereof as appropriate.

             (b) All Approved Investments shall be for the account and risk of
the Lender. To the extent any loss arising out of Approved Investments results
in a deficiency in the amount of Collateral available for return to a Borrower
pursuant to the Securities Borrowing Agreement, the Lender agrees to pay the
Bank on demand cash in an amount equal to such deficiency.

             (c) Except as otherwise provided herein, all Collateral, Approved
Investments and Distributions credited to the Collateral Account on behalf of
the Lender shall be controlled by, and subject only to the instructions and
discretion of, the Bank.

          4.3 Distribution on Loaned Securities. The Bank shall receive
              ---------------------------------
distributions paid on loaned Securities from Borrowers and/or issuers in
accordance with the applicable Securities Borrowing Agreement and shall credit
all such amounts received by the Bank to the Account.

          4.4 Marks to Market. The Bank shall on each Business Day, in
              ---------------
accordance with standard market practice, mark to market in U.S. dollars the
value of all Securities loaned hereunder and accordingly receive and release
Collateral and Approved Investments in accordance with the applicable Securities
Borrowing Agreement.

          4.5 Collateral Substitutions. The Bank shall accept substitutions of
              ------------------------
Collateral in accordance with the applicable Securities Borrowing Agreement and
shall credit all such substitutions to the Collateral Account, provided however
that unless other Collateral has been mutually agreed upon in writing by the
Bank and the Lender, no other Collateral may be substituted for Cash Collateral.
Any substitutions of Collateral under this Section 4.5 shall be reported to the
Lender as part of the Bank's daily reporting schedule.

          4.6 Termination of Loans. The Bank shall terminate any Securities loan
              --------------------
to a Borrower in accordance with the applicable Securities Borrowing Agreement
as soon as practicable after:

             (a) receipt by the Bank of a notice of termination pursuant to the
Securities Borrowing Agreement;

                                       5
<PAGE>

             (b) receipt by the Bank of Written Instructions from the Lender
instructing it to terminate a Securities loan;

             (c) receipt by the Bank of Written Instructions from the Lender
deleting the Borrower to whom such loan was made from Schedule II hereto;

             (d) upon the Bank's becoming aware of the occurrence of any default
pursuant to the applicable Securities Borrowing Agreement requiring termination
of such loan; or

             (e) whenever the Bank, in its sole discretion, elects to terminate
such loan.

     4.7  Securities Loan Fee. The Bank shall receive any applicable Securities
          -------------------
Loan Fee paid by Borrowers pursuant to the Securities Borrowing Agreement and
credit all such amounts received to the Collateral Account.

     4.8  The Borrower's Financial Condition. The Bank has delivered to the
          ----------------------------------
Lender each of the Borrower's most recent statements that have been made
available to the Bank pursuant to the Securities Borrowing Agreements. The Bank
shall promptly deliver to the Lender all statements and financial information
subsequently delivered to the Bank and required to be furnished to the Bank
under the Securities Borrowing Agreements.

     4.9  Transfer Taxes and Necessary Costs. All transfer taxes and necessary
          ----------------------------------
costs with respect to the transfer of the loaned Securities by the Lender to the
Borrower and the Borrower to the Lender upon the termination of the loan shall
be paid by the Borrower in accordance with the applicable Securities Borrowing
Agreement.

     4.10 Remedies Upon Default. In the event of any default by a Borrower under
          ---------------------
the applicable Securities Borrowing Agreement, the Bank shall use its best
efforts to pursue, on behalf of the Lender, any remedies that the Bank or the
Lender may have under the applicable Securities Borrowing Agreement and any
applicable laws and regulations.

     4.11 Bank's Obligation. Except as specifically set forth herein, or in any
          -----------------
applicable Securities Borrowing Agreement, the Bank shall have no duty or
obligation to take action to effect payment by a Borrower of any amounts owed by
such Borrower pursuant to the Securities Borrowing Agreement.

5.  Concerning the Bank.
    -------------------

     5.1  Standard of Care: Indemnification.
          ---------------------------------
          (a)  The Bank shall not be liable for any costs, expenses, damages,
liabilities or claims (including attorneys and accountants fees) incurred by the
Lender, except those costs, expenses, damages, liabilities or claims arising out
of the Bank's negligence, willful misconduct, bad faith, or reckless disregard
of its obligations and duties hereunder. The Bank, except to the extent of its
own negligence, bad faith and willful misconduct, shall have no obligation
hereunder for costs, expenses, damages, liabilities or claims (including
reasonable attorneys and accountants fees), which are sustained or incurred by
reason of any action or inaction by the Book-Entry System or any Depository or
their respective successors or nominees.

          (b) The Lender agrees to indemnify the Bank and to hold it harmless
from and against any and all costs, expenses, damages, liabilities or claims,
including reasonable fees and expenses of

                                       6
<PAGE>

counsel, which the Bank may sustain or incur or which may be asserted against
the Bank by reason of or as a result of any action taken or omitted by the Bank
in connection with or arising out of the Bank's operating under and in
compliance with this Agreement, except those costs, expenses, damages,
liabilities or claims arising out of the Bank's negligence, bad faith, willful
misconduct, or reckless disregard of its obligations and duties hereunder. The
foregoing indemnity shall be a continuing obligation of the Lender, its
successors and assigns, notwithstanding the termination of any loans hereunder
or of this Agreement. Actions taken or omitted in reasonable reliance upon Oral
or Written Instructions, any Certificate, or upon any information, order,
indenture, stock certificate, power of attorney, assignment, affidavit or other
instrument reasonably believed by the Bank to be genuine or bearing the
signature of a person or persons reasonably believed by the Bank to be genuine
or bearing the signature of a person or persons reasonably believed to be
authorized to sign, countersign or execute the same, shall be presumed to have
been taken or omitted in good faith.

     5.2 No Obligation to Inquire. Without limiting the generality of the
         ------------------------
foregoing, the Bank shall be under no obligation to inquire into, and, except to
the extent of the Bank's negligence, bad faith and willful misconduct, the Bank
shall not be liable for, the validity of the issue of any Securities at any time
held in the Account or Approved Investments held in the Collateral Account, or
the legality or propriety of any loans of Securities to Borrowers.

     5.3 Advances, Overdrafts and Indebtedness; Security Interest.
         --------------------------------------------------------

             (a) The Bank may, in its sole discretion, advance funds on behalf
of the Lender in order to pay to Borrowers any Rebates or to return to Borrowers
Cash Collateral to which they are entitled pursuant to the Securities Borrowing
Agreement. The Bank may also, in its sole discretion and as a matter of
bookkeeping convenience, credit the Account with interest, dividends or other
distributions payable on Securities prior to its actual receipt of final payment
therefor and the Lender agrees that such bookkeeping credits may also be
reflected on its books, and otherwise, as "immediately available" or "same day"
funds or by some similar characterization. Notwithstanding any such credit or
characterization, all such credits shall be conditional upon the Bank's actual
receipt of final payment and may be reversed by the Bank to the extent that
final payment is not received. If the Bank, in its sole discretion, permits the
Lender to use funds credited to the Account prior to receipt by the Bank of
final payment thereof, the Lender shall nonetheless, continue to bear the risk
of, and liability for, the Bank's non receipt of final payment in full.

             (b) The Lender agrees to repay the Bank on demand the amount of any
advance or credit described in Section 5.3(a) above or any other amount owed by
the Lender hereunder plus accrued interest at a rate per annum (based on a 360-
day year for the actual number of days involved) as agreed to by the parties
from time to time. In order to secure repayment of any credit, advance,
overdraft or other indebtedness of the Lender to the Bank arising hereunder, the
Lender hereby agrees that the Bank shall have a continuing lien and security
interest, to the extent of any such amounts owing, in and to all assets now or
hereafter held in the Account and the Collateral Account, which is then in the
Bank's possession or control or in the possession or control of any third party
acting on the Bank's behalf. In this regard, the Bank shall be entitled to
charge any amounts owed to the Bank hereunder against any balance of account
standing to the credit of the Lender on the Bank's books and, without limiting
the foregoing, to all the rights and remedies of a pledgee under common law and
a secured party under the Massachusetts Uniform Commercial Code and/or any other
applicable laws and/or regulations as then in effect.

             (c) The rights of the Bank and the obligations of the Lender under
this Section are absolute and unconditional whether or not the Bank would be
entitled to indemnification pursuant to Section 5.l(b) hereof.

                                       7
<PAGE>

             (d) For all purposes of this Agreement, payment with respect to a
transaction will not be "final" until the Bank shall have received immediately
available funds which under applicable law or rule are irreversible, which are
not subject to any security interest, levy or other encumbrance, and which are
specifically applicable, or deemed by the Bank to be specifically applicable, to
such transaction. A debit by the Bank to any other account of the Lender
maintained by the Bank or to an account of any third party to whom or for whose
account Securities have been delivered shall not constitute final payment to the
extent that such debit creates an overdraft or does not otherwise result in the
receipt by the Bank of immediately available, irreversible and unencumbered
funds.

          5.4 Advice of Counsel The Bank may, with respect to questions of law,
              -----------------
apply for and obtain the advice and opinion of counsel and shall be fully
protected with respect to anything done or omitted by it in good faith in
conformity with such advice or opinion.

          5.5 No Collection Obligations. The Bank, as Lending Agent, shall use
              -------------------------
reasonable efforts to effect collection of any amounts payable in respect of
Securities or Approved Investments if such Securities or Approved Investments
are in default, or if payment is refused after due demand and presentation.

          5.6 Pricing Methods. The Bank is authorized to utilize any recognized
              ---------------
pricing information service or any other means of valuation specified in the
applicable Securities Borrowing Agreement ("Pricing Methods") in order to
perform its valuation responsibilities with respect to loaned Securities,
Collateral and Approved Investments, and the Lender agrees to hold the Bank
harmless from and against any loss or damage suffered or incurred as a result of
errors or omissions of any such Pricing Methods, except to the extent such loss
or damage is due to the negligence, bad faith or willful misconduct of the Bank.

          5.7 Agent's Fee. In connection with each Securities loan hereunder the
              -----------
Lender shall pay to the Bank a fee equal to 40% of (a) net realized income
derived from Approved Investments, plus (b) any Securities Loan Fee paid or
payable by the Borrower, minus (c) any Rebate paid by the Bank to the Borrower.
The Bank is authorized, on a monthly basis, to charge its fee and any other
amounts owed by the Lender hereunder against the Account and/or Collateral
Account.

          5.8 Reliance On Certificates and Instructions. The Bank shall be
              -----------------------------------------
entitled to rely upon any Certificate, any information contained on any Schedule
hereto as may be amended in accordance with the terms hereof, and Written or
Oral Instruction actually received by the Bank and reasonably believed by the
Bank to be duly authorized and delivered. The Lender agrees to forward to the
Bank Written Instructions confirming Oral Instructions in such manner so that
such Written Instructions are received by the Bank by the close of business of
the same day that such Oral Instructions are given to the Bank. The Lender
agrees that the fact that such confirming Written Instructions are not received
on a timely basis or that contrary instructions are received by the Bank shall
in no way affect the validity or enforceability of the transactions authorized
by the Lender. The Bank will use reasonable efforts to report any subsequently
received contrary instructions. In this regard, the records of the Bank shall be
presumed to reflect accurately any Oral Instructions given by an Authorized
Person or a person reasonably believed by the Bank to be an Authorized Person.

          5.9 Disclosure of Account Information. It is understood and agreed
              ---------------------------------
that the Bank is authorized to supply any information regarding the Account
which is required by any applicable law or governmental regulation now or
hereafter in effect.

                                       8
<PAGE>

          5.10 Statements. The Bank will at least daily furnish the Lender with
               ----------
statements relating to loans hereunder.

          5.11 Force Majeure. The Bank shall not be responsible or liable for
               -------------
any failure or delay in the performance of its obligations under this Agreement
arising out of or caused by acts of God, earthquakes, fires, floods, storms or
other disturbances of nature, epidemics, strikes, riots, nationalization,
expropriation, currency restrictions, acts of war, civil war or terrorism,
insurrection, nuclear fusion, fission or radiation, the interruption, loss or
malfunction of utilities, transportation, the unavailability of energy sources
and other similar happenings or events beyond the reasonable control of the Bank
except as results from the Bank's own negligence.  Notwithstanding the
foregoing, the Bank has and shall maintain appropriate back-up and disaster
recovery facilities and shall use it best efforts to provide all required
information and services hereunder to the Lender as soon as possible after any
such delay in performance.

          5.12 No Implied Duties.
               -----------------

                 (a) The Bank and Lender shall have no duties or
responsibilities whatsoever except such duties and responsibilities as are
specifically set forth in this Agreement.

6.  Termination.  This Agreement may be terminated at any time by either party
    -----------
upon delivery to the other party of a written notice specifying the date of such
termination, which shall be not less than 60 days after the date of receipt of
such notice. Notwithstanding any such notice, this Agreement shall continue in
full force and effect with respect to all loans of Securities outstanding on the
date of termination.

7.  Miscellaneous.
    -------------

          7.1 Exclusivity. The Lender agrees that it shall not enter into any
              -----------
other agreement with any third party whereby such third party is permitted to
make loans on behalf of the Lender of any securities held by the Bank in the
Account from time to time.

          7.2 Certificates. The Lender agrees to furnish to the Bank a new
              ------------
Certificate in the event that any present Authorized Person ceases to be an
Authorized Person or in the event that any other Authorized Persons are
appointed and authorized. Until such new Certificate is received, the Bank shall
be fully protected in acting upon Oral Instructions or signatures of the present
Authorized Persons.

          7.3 Notices.
              -------

                 (a) Any notice or other instrument in writing, authorized or
required by this Agreement to be given to the Bank, shall be sufficiently given
if addressed to the Bank and received by it at its offices at 200 Clarendon
Street, P.O. Box 9130, Boston, Massachusetts 02117-9130, Attention: Securities
Lending Department, with a copy to: John E. Henry, General Counsel or at such
other place as the Bank may from time to time designate in writing.

                 (b) Any notice or other instrument in writing, authorized or
required by this Agreement to be given to the Lender shall be sufficiently given
if addressed to the Lender and mailed or delivered to it at its offices at 440
Lincoln Street, Worcester, MA 01653, Attention President, with a copy to Counsel
or at such other place as the Lender may from time to time designate in writing.

                                       9
<PAGE>

          7.4 Cumulative Rights and No Waiver. Each and every right granted to a
              -------------------------------
party hereunder or under any other document delivered hereunder or in connection
herewith, or allowed it by law or equity, shall be cumulative and may be
exercised from time to time. No failure on the part of a party to exercise, and
no delay in exercising, any right will operate as a waiver thereof, nor will any
single or partial exercise by a party of any right preclude any other or future
exercise thereof or the exercise of any other right.

          7.5 Severability. In case any provision in or obligation under this
              ------------
Agreement shall be invalid, illegal or unenforceable in any jurisdiction, the
validity, legality and enforceability of the remaining provisions or obligations
shall not in any way be affected or impaired thereby, and if any provision is
inapplicable to any person or circumstances, it shall nevertheless remain
applicable to all other persons and circumstances.

          7.6 Amendments. This Agreement may not be amended or modified in any
              ----------
manner except by a written agreement executed by both parties.

          7.7 Successors and Assigns. This Agreement shall extend to and shall
              ----------------------
be binding upon the parties hereto, and their respective successors and assigns;
provided, however, that this Agreement shall not be assignable by either party
without the written consent of the other.

          7.8 Governing Law; Consent to Jurisdiction. This Agreement shall be
              --------- ----------------------------
construed in accordance with the laws of the Commonwealth of Massachusetts
without regard to conflict of laws principles thereof.

          7.9 No Third Party Beneficiaries. In performing hereunder, the Bank is
              ----------------------------
acting solely on behalf of the Lender and no contractual or service relationship
shall be deemed to be established hereby between the Bank and any other person.

          7.10 Counterparts. This Agreement may be executed in any number of
               ------------
counterparts, each of which shall be deemed to be an original, but such
counterparts shall, together, constitute only one instrument.

          7.11 SIPA Notice. THE PROVISIONS OF THE SECURITIES INVESTOR PROTECTION
               -----------
ACT OF 1970 MAY NOT PROTECT THE LENDER WITH RESPECT TO LOANS HEREUNDER AND,
THEREFORE, THE COLLATERAL DELIVERED TO THE BANK AS AGENT FOR THE LENDER, MAY
CONSTITUTE THE ONLY SOURCE OF SATISFACTION OF A BORROWER'S OBLIGATION IN THE
EVENT SUCH BORROWER FAILS TO RETURN THE LOANED SECURITIES.

          7.12 Limitation of Liability.  A copy of the Agreement and Declaration
               -----------------------
of Trust of the Lender is on file with the Secretary of State of the
Commonwealth of Massachusetts, and notice is hereby given that this Agreement is
executed by or on behalf of the Lender by the Trustees as Trustees or by the
officers as officers and not individually, and that the obligations of this
Agreement are not binding upon any of the Trustees, officers or shareholders of
the Lender, but are binding only upon the assets and property of the Lender.
The parties hereto agree that no shareholder, Trustee or officer of the Lender
may be held personally liable or responsible for any obligation of the Lender
arising out of this Agreement.


                  [Remainder of Page Intentionally Left Blank]

                                       10
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their respective corporate officers, thereunto duly authorized,
as of the day and year first above written.


                           ALLMERICA INVESTMENT TRUST


                           By: /s/ Richard M. Reilly
                               ---------------------
                               Title:  President


                           INVESTORS BANK & TRUST COMPANY



                           By: /s/ Michael F. Rogers
                               ---------------------
                               Title:  Executive Vice President

                                       11
<PAGE>

                                  Schedule I
                             Approved  Investments


Bank Obligations:
- ------------------
  Bank Obligations with Domestic and Foreign Banks including Offshore Time
  Deposits. All Banks obligations will have a short term rating of  TBW-1, A-1,
  or P-1 from Thompson Bankwatch, S & P or Moody's at time of purchase.

Money Market Funds
  Institutional Money Market Funds with assets greater than $500 million.

Repurchase Agreements
  Collateral held by IBT or a third party subcustodian. Collateralized at a
  minimum of 102%. Eligible Collateral includes US Government, Mortgage Backed
  Securities, Commercial Paper (A-1 or P-1) & US Corporate Bonds (Investment
  Grade)) with the following brokers.

               ABN AMRO
               Bear Stearns & Co, Inc
               CS First Boston Corporation
               Goldman Sachs & Co.
               Lehman Brothers, Inc.
               J.P. Morgan Securities, Inc
               Merrill Lynch Government Securities.
               Morgan Stanley & Co. Inc.
               PaineWebber, Inc
               Prudential Securities, Inc
               UBS Securities.Inc


Commercial Paper
     Must be rated A-1 by S&P or P-1 by Moodys at time of purchase.

Corporate Bond
- --------------
     Must have a Short Term rating of rated A-1 by S&P or P-1 by Moodys or have
     a Long Term Rating of Investment Grade at time of purchase.

Unsecured Promissory Notes (Master Notes)
- -----------------------------------------
     Must have a rating or Parental rating of A-1 by S&P or P-1 by Moodys at
     time of purchase.

Insurance Funding Agreements
     Must have a minimum Issuers Claim Paying Ability rating of A by S&P or A by
     Duff and Phelps at time of purchase. Must be putable back to the issuer
     within 90 days.
<PAGE>

GENERAL
- -------
 .   All investments will be US Dollar denominated.
 .   The final maturity for any security/issue will be less than one year.
 .   All investments will be in compliance with Investment Company Act of 1940.
 .   All investments will meet the minimum applicable credit rating associated
    with each fund at time of purchase.
 .   No more than 5% of the Funds total assets will be invested in any one Money
    Market Fund, not to exceed 10% of the Funds total assets for total Money
    Market Funds.

                                                  By:__________________________

                                                  Title:_______________________

                                                  Date:________________________
<PAGE>

                                  Schedule II
                              Approved  Borrowers


  Bear Stearns & Co. Inc.
  BT Alex Brown Inc.
  Credit Suisse First Boston Corporation
  Goldman, Sachs & Co.
  Lehman Brothers, Inc.
  Merrill Lynch, Pierce, Fenner & Smith, Inc.
  Morgan Stanley & Co. Inc. (Includes Morgan Stanley Securities Services Inc.)
  Prudential Securities, Inc.
  Salomon Smith Barney Inc.



                                                By:__________________________

                                                Title:_______________________

                                                Date:________________________
<PAGE>

                                  Schedule III

                             Letter of Credit Banks




                              [To be Determined]
<PAGE>

                                  Schedule IV

                                 Depositories

The depositories approved by the Lender.



<PAGE>

                                                                       EXHIBIT 9






                                       February 28, 2000



Allmerica Investment Trust
440 Lincoln Street
Worcester, MA  01653

Ladies and Gentlemen:


In my capacity as Secretary of and Counsel to Allmerica Investment Trust (the
"Trust"), I have participated in the preparation of Amendment No. 40 to its
Registration Statement on Form N-1A under the Investment Company Act of 1940 and
Post-effective Amendment No. 39 under the Securities Act of 1933 with respect to
the issuance of its shares.  I am of the opinion that, when sold in accordance
with the terms of the Prospectuses and Statement of Additional Information in
effect at the time of sale, the shares of each Fund of the Trust will be legally
issued, fully paid and non-assessable by the Trust.

In arriving at the foregoing opinion, I have made such examination of law and
examined such records and other documents as in my judgment are necessary or
appropriate.  I hereby consent to the filing of this opinion as an exhibit to
the Registration Statement on Form N-1A.

                                    Sincerely,

                                    /s/ George M. Boyd

                                    George M. Boyd
                                    Secretary and Counsel

<PAGE>

                                                                      EXHIBIT 10


                      CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the incorporation by reference in this Post-Effective
Amendment No. 39 to the registration statement on Form N-1A ("Registration
Statement") of our report dated February 14, 2000, relating to the financial
statements and financial highlights which appears in the December 31, 1999
Annual Report to Shareholders of the Allmerica Investment Trust, which are also
incorporated by reference into the Registration Statement. We also consent to
the references to us under the heading "Financial Highlights", "Independent
Accountants" and "Financial Statements" in such Registration Statement.



/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP
Boston, Massachusetts

February 25, 2000

<PAGE>

                                                                      Exhibit 16

                          Allmerica Investment Trust
                          Allmerica Securities Trust

                                CODE OF ETHICS
                            Pursuant to Rule 17j-1

Allmerica Investment Trust and Allmerica Securities Trust (each being
hereinafter referred to as the "Trust") have determined to adopt this Code of
Ethics, ("this Code") to specify and prohibit certain types of personal
securities transactions deemed to create conflicts of interest, to prevent each
Trust's Officers, Trustees and other personnel, as applicable, from engaging in
conduct prohibited by Rule 17j-1 of the Investment Company Act of 1940 (the
"Rule") and to establish reporting requirements and enforcement procedures
pursuant to the provisions of the Rule.

GENERAL PRINCIPLES

This Code is intended to embody the following general principles:

      1. The duty of all personnel at all times to place the interests of Trust
         shareholders first;

      2. The requirement that all personnel securities transactions must be
         conducted consistent with this Code and in such a manner as to avoid
         any actual or potential conflict of interest or any abuse of an
         individual's position of trust and responsibility; and

      3. The fundamental standard that personnel must not take inappropriate
         advantage of their positions.

This Code is divided into three parts.  The first part contains provisions
applicable to Trustees and Officers who are officers, directors or employees of
any investment adviser, sub-adviser, recordkeeping agent or principal
underwriter of the Trust ("Service Provider").  The second part pertains to
unaffiliated Trustees of the Trust.  The third part contains recordkeeping and
other provisions.

CODE APPROVALS

The Board of Trustees of each Trust, including a majority of Trustees who are
not interested persons, must approve this Code, the code of ethics of each
Service Provider and any material changes to such codes.  The Board must base
its approval of a code of ethics and any material changes to that code on a
determination that the code contains provisions reasonably necessary to prevent
applicable personnel from engaging in any conduct prohibited by Rule 17j-1 (b)
of the Rule.  Before approving this Code or a code of ethics of an investment
adviser, sub-adviser or principal underwriter or an amendment to any such code,
the Board of Trustees must receive a certification that the applicable
organization has adopted procedures reasonably necessary to prevent its
officers, trustees/directors and other personnel from violating its code of
ethics.  A Trust's Board of Trustees must approve the code of ethics of an
investment adviser, sub-adviser or principal underwriter before initially
retaining the firm's services.  A Trust's Board must approve a material change
to a previously approved code no later than six months after adoption of the
material change.  See also Section III.A. "Amendments to Service Provider's Code
of Ethics".
<PAGE>

I.  Rules Applicable to Affiliated Officers and Trustees Who Are Officers,
    Directors, or Employees of Service Providers.

    A.  Incorporation of Service Provider's Code of Ethics. The provisions of
        each Service Provider's Code of Ethics are incorporated herein by
        reference as the Trust's Code of Ethics applicable to Trustees, or
        Officers of the Trust who are officers, directors or employees of a
        Service Provider. A violation of a Service Provider's Code of Ethics
        shall constitute a violation of this Code.

    B.  Reports.

        (1)  Trustees or Officers of the Trust who are officers, directors or
             employees of a Service Provider shall file the confidential reports
             required under such Service Provider's Code of Ethics with the
             officer (the "Review Officer") designated from time to time by the
             Trustees of the Trust to receive such reports.

        (2) A report filed with the Review Officer shall be deemed to be filed
            with the Trust of which the reporting individual is a Trustee or
            Officer.

    C.  Review and Sanctions for Affiliated Officers. In respect of Officers of
        the Trust who are also officers, directors or employees of a Service
        Provider, the provisions of such Service Provider's Code of Ethics
        relating to review and to sanctions shall govern. Where any violation of
        the Service Provider's Code of Ethics is found in respect of any such
        Officer of the Trust, it shall be reported to the Trustees of the Trust,
        together with any sanctions imposed for such violation.

    D.  Review and Sanctions for Affiliated Trustees. In respect of Trustees of
        the Trust who are also officers, directors or employees of a Service
        Provider, the procedure for review and sanctions set forth in such
        Service Provider's Code of Ethics shall govern. Where any violation of
        the Service Provider's Code of Ethics is found in respect of any such
        Affiliated Trustee of the Trust, it shall be reported to Trustees of the
        Trust, together with any sanctions imposed for such violation. The
        Trustees may, at their option, impose such further sanctions as are
        deemed appropriate.

II. Rules Applicable to Unaffiliated Trustees.

    A.  Definitions.

        (1)  "Affiliated person" shall have the same meaning as set forth in
             Section 2(a)(3) of the Investment Company Act.

        (2)  "Beneficial ownership" shall be interpreted in the same manner as
             it would be in determining whether a person is subject to the
             provisions of Section 16 of the Securities Exchange Act of 1934 and
             the rules and regulations thereunder. Application of this
             definition is explained in more detail in Appendix A hereto.

        (3)  "Control" shall have the same meaning as that set forth in Section
             2(a)(9) of the Investment Company Act. Section 2(a)(9) provides
             that "control" means the power

                                       2
<PAGE>

             to exercise a controlling influence over the management or policies
             of a company, unless such power is solely the result of an official
             position with such company.

        (4)  "Disinterested Trustee" means a Trustee of the Trust who is not an
             "interested person" of the Trust within the meaning of Section
             2(a)(19) of the Investment Company Act. An "interested person"
             includes any person who is an affiliated person of a broker or
             dealer.

        (5)  "Purchase or sale of a security" includes, among other things, the
             writing of an option to purchase or sell a security.

        (6)  "Security" shall have the same meaning as that set forth in Section
             2(a)(36) of the Investment Company Act (in effect, all securities),
             except that it shall not include direct obligations of the United
             States, short-term securities issued or guaranteed by an agency or
             instrumentality of the United States, bankers acceptances, bank
             certificates of deposit, commercial paper and shares of registered
             open-end investment companies, and any other securities excepted by
             the Rule.

        (7)  A security is "being considered for purchase or sale" when a
             recommendation to purchase or sell the security has been made and
             communicated and, with respect to the person making the
             recommendation, when such person seriously considers making such a
             recommendation.

        (8)  "Unaffiliated Trustee" means a Trustee of the Trust who is not an
             officer, director, employee or shareholder of any Service Provider
             or of any affiliated person of any Service Provider.

    B.  Prohibited Purchases and Sales. No Unaffiliated Trustee of the Trust
        shall purchase or sell, directly or indirectly, any security in which he
        or she has, or by reason of such transaction acquires, any direct or
        indirect beneficial ownership and which to his or her knowledge at the
        time of such purchase or sale.

        (1)  is being considered for purchase or sale by the Trust; or

        (2)  is being purchased or sold by the Trust; or

        (3)  was purchased or sold by the Trust within the most recent 15 days
             if such person participated in the recommendation to, or the
             decision by, the Trust to purchase or sell such security.

    C.  Exempted Transactions. The prohibitions of Section II-B of this Code
        shall not apply to

        (1)  purchases or sales effected in any account over which the
             Unaffiliated Trustee has no direct or indirect influence or
             control;

        (2)  purchases or sales which are non-volitional on the part of either
             the Unaffiliated Trustee or the Trust;

                                       3
<PAGE>

        (3)  purchases which are part of an automatic dividend reinvestment
             plan;

        (4)  purchases effected upon the exercise of rights issued by an issuer
             pro rata to all holders of a class of its securities, to the
             --------
             extent such rights were acquired from such issuer, and sales of
             such rights so acquired;

        (5)  purchases or sales previously approved by the Trust's Review
             Officer (a) since they are only remotely potentially harmful to the
             Trust because they would be very unlikely to affect a highly
             institutional market or because they clearly are not related
             economically to the securities to be purchased, sold or held by the
             Trust, or (b) as not presenting any danger of the abuses proscribed
             by the Rule, which approval shall be confirmed in writing.

    D.  Reporting.

        (1)  Every Unaffiliated Trustee of the Trust who is also a Disinterested
             Trustee of the Trust shall file with the person(s) designated by
             the Trustees as "the Trust's Review Officer(s)" a report containing
             the information described in Section II-D(4) of this Code with
             respect to transactions in any security in which such Disinterested
             Trustee has, or by reason of such transaction acquires, any direct
             or indirect beneficial ownership, whether or not one of the
             exemptions listed in Section 11-C applies, if such Trustee, at the
             time of that transaction, knew or, in the ordinary course of
             fulfilling his or her official duties as a Trustee of the Trust,
             should have known that, during the 15-day period immediately
             preceding or following the date of the transaction by the Trustee:

             (a)  such security was being purchased or sold by the Trust, or

             (b)  such security was being considered for purchase or sale by the
                  Trust or by a Service Provider for the portfolio of the Trust.

        Notwithstanding the preceding sentence, any Disinterested Trustee may,
        at his or her option, report the information described in Section II-
        D(4) with respect to any one or more transactions in any security in
        which such person has, or by reason of the transaction acquires, any
        direct or indirect beneficial ownership.

        (2)  Every Unaffiliated Trustee of the Trust who is not also a
             Disinterested Trustee of the Trust shall file with the Review
             Officer(s) a report containing the information described in Section
             II-D(4) of this Code with respect to transactions in any security
             in which such Trustee has, or by reason of such transaction
             acquires, any direct or indirect beneficial ownership, whether or
             not one of the exemptions listed in Section II-C applies.

        (3)  Anything in Section II-D(1) or (2) above to the contrary
             notwithstanding, no Unaffiliated Trustee shall be required to make
             a report with respect to transactions effected for any account over
             which such person does not have any direct or indirect influence or
             control.

                                       4
<PAGE>

        (4)  Every report shall be made not later than 10 days after the end of
             the calendar quarter in which the transaction to which the report
             relates was effected, and shall contain the following information.

            (a)  the date of the transaction, the title and the number of shares
                 or the principal amount of each security involved;

            (b)  the nature of the transaction (i.e., purchase, sale or any
                 other type of acquisition or disposition);

            (c)  the price at which the transaction was effected; and

            (d)  the name and address of the broker, dealer or bank with or
                 through whom the transaction was effected.

        (5)  Every report concerning a purchase or sale prohibited under Section
             II-B herein with respect to which the reporting person relies upon
             one of the exemptions provided in Section II-C herein shall contain
             a brief statement of the exemption relied upon and the
             circumstances of the transaction.

        (6)  Any such report may contain a statement that the report shall not
             be construed as an admission by the person making such report that
             he or she has any direct or indirect beneficial ownership in the
             security to which the report relates. Such report also may contain
             a statement that the report is made with respect to all portfolio
             transactions of such person, and shall not be construed as an
             admission that the person knew or should have known of portfolio
             transactions by the Trust in such securities.

    E.  Review.

        (1)  The Trust's Review Officer(s) shall compare the reported personal
             securities transactions with the completed and contemplated
             portfolio transactions of the Trust to determine whether any
             transaction ("Reviewable Transactions") listed in Section II-B
             (disregarding exemptions provided by Section II-C(1) through (4))
             may have occurred.

        (2)  If the Trust's Review Officer(s) determines that a Reviewable
             Transaction may have occurred, the Review Officer shall determine
             whether a violation of this Code may have occurred, taking into
             account all the exemptions provided under Section II-C. Before
             making any determination that a violation has been committed by a
             Trustee, the Trust's Review Officer(s) shall give such person an
             opportunity to supply additional information regarding the
             transaction in question.

    F.  Sanctions. If the Trust's Review Officer(s) determines that any Trustee
        of the Trust has violated this Code, he shall so advise the Chairman of
        the Board of the Trust and also a committee consisting of the
        Disinterested Trustees (other than the person whose transaction is under
        consideration), and shall provide the committee with the report, the
        record of pertinent actual or contemplated portfolio transactions or the
        Trust, and any additional material supplied by such person. The
        committee, at its option, either shall

                                       5
<PAGE>

        impose such sanctions as it deems appropriate or refer the matter to the
        full Board of Trustees, which shall impose such sanctions as are deemed
        appropriate.

III. Miscellaneous.

     A. Amendments to Service Provider's Code of Ethics. Any amendment to a
        Service Provider's Code of Ethics shall be deemed an amendment to
        Section I-A of this Code, effective 90 days after written notice of such
        amendment shall have been received by the Secretary of the Trust, unless
        the Trustees of the Trust expressly determine that such amendment shall
        become effective at an earlier date or have not approved the amendment
        as provided under "Code Approvals".

    B.  Records. The Trust shall maintain records in the manner and to the
        extent set forth below, which records may be maintained in any manner
        described in Rule 31A-2(f)(1) under the Investment Company Act, and
        shall be available for examination by representatives of the Securities
        and Exchange Commission:

        (1)  A copy of this Code and any other code which is, or at any time
             within the past five years has been, in effect shall be preserved
             in an easily accessible place.

        (2)  A record of any violation of this Code and of any action taken as a
             result of such violation shall be preserved in an easily accessible
             place for a period of not less than five years following the end of
             the fiscal year in which the violation occurs.

        (3) A copy of each report made by any person pursuant to this Code shall
            be preserved for a period of not less than five years from the end
            of the fiscal year in which it is made, for the first two years in
            an easily accessible place.

        (4) A list of all persons who are, or within the past five years have
            been, required to make reports pursuant to this Code, or who are
            responsible for reviewing these reports, shall be maintained in an
            easily accessible place.

    C.  Confidentiality. All reports of securities transactions and any other
        information filed with the Trust pursuant to this Code shall be treated
        as confidential.

    D.  Interpretation of Provisions. The Trustees may from time to time adopt
        such interpretations of this Code as they deem appropriate.

    E.  Administration and Procedures. The Trusts must use reasonable diligence
        and institute procedures reasonably necessary to prevent violations of
        this Code. Each Trust must institute procedures by which appropriate
        management or compliance personnel review reports required to be
        submitted to the Trust under this Code. Each Trust must identify all
        persons who are required to make reports to the Trust under this Code
        and must inform those persons of their reporting obligation.

        No less frequently than annually, each Trust must furnish to the Trust's
        Board of Trustees and the Board of Trustees must consider, a written
        report that:

                                       6
<PAGE>

        (1)  Describes any issues arising under this Code or procedures or the
             codes of ethics of the Service Providers since the last report to
             the Board of Trustees, including, but not limited to, information
             about material violations of such codes or procedures and sanctions
             imposed in response to the material violations; and

         (2) Certifies that the Trust and its Service Providers have adopted
             procedures reasonably necessary to prevent their respective
             officers, trustees/directors and other personnel from violating
             this Code or the codes of the respective Service Providers.


Adopted 2/14/95

Amended 2/15/00

                                       7
<PAGE>

                                  APPENDIX A
                                      to
                                CODE OF ETHICS


This Code of Ethics relates to the purchase or sale of securities of which a
covered person has a direct or indirect "beneficial ownership" except for
purchases or sales in accounts over which the person has no direct or indirect
influence or control as described below.

Beneficial Ownership

"Beneficial ownership" means that one directly or indirectly, by written or
unwritten understanding, has (or shares a direct or indirect) financial interest
regardless of who is the owner of record.  Financial interest means the
opportunity directly or indirectly to participate in the risks and rewards of a
transaction.  Securities owned by a person or by a trust of which one has a
beneficial ownership or a similar arrangement include, but are not limited to:

    (1)  Securities owned by your spouse, your minor children and relatives of
         you and your spouse who live in your home, including trusts of which
         such persons are beneficiaries (other than interests in a trust over
         which neither you nor such persons has any direct or indirect influence
         or control over investments);

    (2)  A proportionate interest in securities held by a partnership of which
         you are a general partner;

    (3)  Securities in which you have a right to dividends that is separated or
         separable from the underlying securities;

    (4)  Securities that you have a right to acquire through the exercise or
         conversion of another security, whether or not presently exercisable;
         and

    (5)  Securities held in accounts from which you receive a performance
         related fee based on less than one year's performance.

You do not have a financial interest in securities held by a corporation of
which you are not a controlling shareholder and do not have or share investment
control over its portfolio.

No Influence or Control

The Code does not apply to purchases and sales of securities transactions
effected in any account over which you do not have "any direct or indirect
influence or control".  However, this "no direct or indirect influence or
control" exception is, in the opinion of our counsel, limited to few situations.
The principal one is that described in paragraph (1) above, where securities are
held in a trust, in which you have a beneficial interest, but where you are not
the Trustee and have no control or influence over the Trustee.

                                       8

<PAGE>

                                                                      Exhibit 17

                               POWER OF ATTORNEY

We, the undersigned, hereby severally constitute and appoint Richard M. Reilly,
Joseph W. MacDougall, Jr., George M. Boyd and Gregory D. Sheehan, and each of
them singly, our true and lawful attorneys, with full power to them and each of
them, to sign for us, and in our names and in any and all capacities, any and
all amendments, including post-effective amendments, to the Registration
Statement on Form N-1A of Allmerica Investment Trust and to file the same with
all exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys and each of
them, acting alone, full power and authority to do and perform each and every
act and thing requisite or necessary to be done in the premises, as fully to all
intents and purposes as he or she might or could do in person, hereby ratifying
and confirming all that said attorneys or any of them may lawfully do or cause
to be done by virtue hereof. Witness our hands on the date set forth below.
<TABLE>
<CAPTION>
<S>                                         <C>                                                <C>
Signature                                   Title                                              Date
- ---------                                   -----                                              ----

/s/ John F. O'Brien                         Chairman of the Board and Trustee                  2/15/00
- -------------------------------------                                                          -------
John F. O'Brien

/s/ Richard M. Reilly                       President, Chief Executive Officer                 2/15/00
- -------------------------------------       and Trustee                                        -------
Richard M. Reilly

/s/ Paul T. Kane                            Treasurer (Principal Accounting Officer)           2/15/00
- -------------------------------------                                                          -------
Paul T. Kane

/s/ P. Kevin Condron                        Trustee                                            2/15/00
- --------------------------------------                                                         -------
P. Kevin Condron

                                            Trustee
- -------------------------------------                                                          -------
Cynthia A. Hargadon

/s/ Gordon Holmes                           Trustee                                            2/15/00
- --------------------------------------                                                         -------
Gordon Holmes

/s/ John P. Kavanaugh                       Trustee                                            2/15/00
- --------------------------------------                                                         -------
John P. Kavanaugh

/s/ Bruce E. Langton                        Trustee                                            2/15/00
- --------------------------------------                                                         -------
Bruce E. Langton

/s/ Attiat F. Ott                           Trustee                                            2/15/00
- --------------------------------------                                                         -------
Attiat F. Ott

/s/ Ranne P. Warner                         Trustee                                            2/15/00
- --------------------------------------                                                         -------
Ranne P. Warner
</TABLE>

<PAGE>

                                                                      Exhibit 17

                               POWER OF ATTORNEY

We, the undersigned, hereby severally constitute and appoint Richard M. Reilly,
Joseph W. MacDougall, Jr., George M. Boyd and Gregory D. Sheehan, and each of
them singly, our true and lawful attorneys, with full power to them and each of
them, to sign for us, and in our names and in any and all capacities, any and
all amendments, including post-effective amendments, to the Registration
Statement on Form N-1A of Allmerica Investment Trust and to file the same with
all exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys and each of
them, acting alone, full power and authority to do and perform each and every
act and thing requisite or necessary to be done in the premises, as fully to all
intents and purposes as he or she might or could do in person, hereby ratifying
and confirming all that said attorneys or any of them may lawfully do or cause
to be done by virtue hereof.  Witness our hands on the date set forth below.

<TABLE>
<CAPTION>
Signature                     Title                                        Date
- ---------                     -----                                        ----
<S>                           <C>                                          <C>
_______________________       Chairman of the Board and Trustee            _________________
John F. O'Brien

_______________________       President, Chief Executive Officer           _________________
Richard M. Reilly             and Trustee

_______________________       Treasurer (Principal Accounting Officer)     _________________
Paul T. Kane

_______________________       Trustee                                      _________________
P. Kevin Condron

/s/ Cynthia A. Hargadon       Trustee                                      2/16/00
- -----------------------                                                    -----------------
Cynthia A. Hargadon

_______________________       Trustee                                      _________________
Gordon Holmes

_______________________       Trustee                                      _________________
John P. Kavanaugh

_______________________       Trustee                                      _________________
Bruce E. Langton

_______________________       Trustee                                      _________________
Attiat F. Ott

_______________________       Trustee                                      _________________
Ranne P. Warner
</TABLE>


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