PIONEER SHORT TERM INCOME TRUST
485BPOS, 1998-03-30
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As filed with the Securities and Exchange Commission on March 30, 1998
                                                              File Nos. 33-47613
                                                                   811-06657    

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-1A

          REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 / X /
                                                                   ---

                         Pre-Effective Amendment No. __           /   /

   
                         Post-Effective Amendment No. 6           / X /
                                                                   ---    

                                     and/or

                        REGISTRATION STATEMENT UNDER THE
                         INVESTMENT COMPANY ACT OF 1940           / X /

   
                                 Amendment No. 7                  / X /    
                        (Check appropriate box or boxes)

                         PIONEER SHORT-TERM INCOME TRUST
   
               (Exact Name of Registrant as Specified in Charter)    

                  60 State Street, Boston, Massachusetts 02109
   
               (Address of Principal Executive Offices) (Zip Code)    

     Registrant's Telephone Number, including Area Code: (617) 742-7825

   
              Joseph P. Barri, Hale and Dorr LLP, 60 State Street,
                          Boston, Massachusetts 02109
                     (Name and Address of Agent for Service)    

   
It is proposed that this filing will become effective (check appropriate box):

     ___ immediately upon filing pursuant to paragraph (b)
      X  on March 30, 1998 pursuant to paragraph (b)
     ---
     ___ 60 days after filing 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.

Title of Securities Being Registered: Shares of Beneficial Interest
(without par value)    


<PAGE>


                         PIONEER SHORT-TERM INCOME TRUST

                           Class A and Class C Shares

      Cross-Reference Sheet Showing Location in Prospectus and Statement of
                      Additional Information of Information
                   Required by Items of the Registration Form

FORM N-1A ITEM NUMBER AND CAPTION        LOCATION IN PROSPECTUS OR STATEMENT
                                         OF ADDITIONAL INFORMATION

1.   Cover Page                          Prospectus - Cover Page

2.   Synopsis                            Prospectus - Expense Information

3.   Condensed Financial Information     Prospectus - Financial Highlights

   
4.   General Description of Registrant   Prospectus - Cover Page; Investment
                                         Objective and Policies; Management of
                                         the Trust; Trust Share Alternatives;
                                         Share Price; How to Buy Trust Shares;
                                         How to Sell Trust Shares; How to
                                         Exchange Trust Shares; The Trust

5.   Management of the Fund              Prospectus - Management of the Trust;
                                         Shareholder Services

5A.  Management's Discussion of Fund
     Performance                         Not Applicable

6.   Capital Stock and Other Securities  Prospectus - Investment Objective and
                                         Policies; Management of the Trust;
                                         Trust Share Alternatives; Share Price;
                                         How to Buy Trust Shares; How to Sell
                                         Trust Shares; How to Exchange Trust
                                         Shares; Dividends, Distributions and
                                         Taxation; The Trust

7.   Purchase of Securities Being
     Offered                             Prospectus - Management of the Trust;
                                         Distribution Plans; Trust Share
                                         Alternatives; Share Price; How to Buy
                                         Trust Shares; How to Sell Trust Shares;
                                         How to Exchange Trust Shares;
                                         Shareholder Services

8.   Redemption or Repurchase            Prospectus - Trust Share Alternatives;
                                         How to Buy Trust Shares; How to Sell
                                         Trust Shares; How to Exchange Trust
                                         Shares; Shareholder Services    

9.   Pending Legal Proceedings           Not Applicable


<PAGE>


10.  Cover Page                          Statement of Additional Information -
                                         Cover Page

11.  Table of Contents                   Statement of Additional Information -
                                         Cover Page


   
12.  General Information and History     Statement of Additional Information -
                                         Description of Shares

13.  Investment Objectives and Policies  Statement of Additional Information -
                                         Investment Policies and Restrictions;
                                         Appendix A

14.  Management of the Fund              Statement of Additional Information -
                                         Management of the Trust    

15.  Control Persons and Principal
     Holders of Securities               Statement of Additional Information -
                                         Management of the Trust

   
16.  Investment Advisory and Other
     Services                            Statement of Additional Information -
                                         Management of the Trust; Investment
                                         Adviser; Underwriting Agreement and
                                         Distribution Plans; Shareholder
                                         Servicing/Transfer Agent; Custodian;
                                         Principal Underwriter; Independent
                                         Public Accountants; Appendix C    

17.  Brokerage Allocation and Other
     Practices                           Statement of Additional Information -
                                         Portfolio Transactions

   
18.  Capital Stock and Other Securities  Statement of Additional Information -
                                         Description of Shares

19.  Purchase, Redemption and Pricing
     of Securities Being Offered         Statement of Additional Information -
                                         Letter of Intent; Systematic Withdrawal
                                         Plan; Determination of Net Asset Value
    

20.  Tax Status                          Statement of Additional Information -
                                         Tax Status

   
21.  Underwriters                        Statement of Additional Information -
                                         Underwriting Agreement and Distribution
                                         Plans; Principal Underwriter

22.  Calculation of Performance Data     Statement of Additional Information -
                                         Investment Results; Appendix B    

23.  Financial Statements                Statement of Additional Information -
                                         Financial Statements


<PAGE>
                                                                  [logo] PIONEER
PIONEER
SHORT-TERM INCOME
TRUST

CLASS A AND CLASS B SHARES
PROSPECTUS
   
MARCH 30, 1998

      PIONEER SHORT-TERM INCOME TRUST (the "Trust") seeks a high level of
current income consistent with a relatively high level of principal stability.
The Trust is a diversified open-end investment company.

      In seeking to achieve its investment objective, the Trust invests
primarily in high-grade short-term debt securities, including securities issued
or guaranteed by the United States ("U.S.") government or its agencies or
instrumentalities and other debt securities of U.S. and foreign issuers. The
Trust invests only in securities with remaining maturities of five years or
less. Under normal circumstances, the Trust will maintain a dollar-weighted
average maturity of not more than three years. See "Investment Objective and
Policies" in this Prospectus.    

      The Trust is designed for investors seeking:

      [bullet] a higher level of current income than normally provided by money
               market investments; and

      [bullet] less price volatility than investments in intermediate and
               long-term fixed income securities.

      Unlike certain money market instruments, an investment in the Trust is
neither insured nor guaranteed and its net asset value will fluctuate. The
Trust's yield will normally be more sensitive to interest rate fluctuations
than that of a fund investing primarily in securities with intermediate or
long-term remaining maturities.

      THE VALUE OF YOUR ACCOUNT UPON REDEMPTION MAY BE MORE OR LESS THAN YOUR
PURCHASE PRICE. SHARES IN THE TRUST ARE NOT DEPOSITS OR OBLIGATIONS OF, OR
GUARANTEED OR ENDORSED BY, ANY BANK OR OTHER DEPOSITORY INSTITUTION, AND THE
SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION,
THE FEDERAL RESERVE BOARD OR ANY OTHER GOVERNMENT AGENCY.

   
      This Prospectus provides the information about the Trust that you should
know before investing. Please read and retain it for your future reference.
More information about the Trust is included in the Statement of Additional
Information also dated March 30, 1998, as supplemented or revised from time to
time, which is incorporated into this Prospectus by reference. A copy of the
Statement of Additional Information may be obtained free of charge by calling
Shareholder Services at 1-800-225-6292 or by written request to the Trust at 60 
State Street, Boston, Massachusetts 02109. Other information about the Trust 
has been filed with the Securities and Exchange Commission (the "SEC") and is 
available upon request and without charge by calling 1-800-225-6292 or through 
the SEC's Internet web site (http://www.sec.gov).

          TABLE OF CONTENTS                                         PAGE
- -------------------------------------------------------------------------
I.        EXPENSE INFORMATION ...................................      2
II.       FINANCIAL HIGHLIGHTS ..................................      3
III.      INVESTMENT OBJECTIVE AND POLICIES .....................      5
IV.       MANAGEMENT OF THE TRUST ...............................      7
V.        TRUST SHARE ALTERNATIVES ..............................      8
VI.       SHARE PRICE ...........................................      8
VII.      HOW TO BUY TRUST SHARES ...............................      9
VIII.     HOW TO SELL TRUST SHARES ..............................     12
IX.       HOW TO EXCHANGE TRUST SHARES ..........................     13
X.        DISTRIBUTION PLANS ....................................     14
XI.       DIVIDENDS, DISTRIBUTIONS AND TAXATION .................     15
XII.      SHAREHOLDER SERVICES ..................................     15
           Account and Confirmation Statements ..................     15
           Additional Investments ...............................     16
           Automatic Investment Plans ...........................     16
           Financial Reports and Tax Information ................     16
           Distribution Options .................................     16
           Directed Dividends ...................................     16
           Direct Deposit .......................................     16
           Voluntary Tax Withholding ............................     16
           Telephone Transactions ...............................     16
           FactFoneSM ...........................................     17
           Retirement Plans .....................................     17
           Telecommunications Device for the Deaf (TDD) .........     17
           Systematic Withdrawal Plans ..........................     17
           Reinstatement Privilege (Class A Shares Only) ........     17
XIII.     THE TRUST .............................................     17
XIV.      INVESTMENT RESULTS ....................................     18

                             --------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
    
<PAGE>

I. EXPENSE INFORMATION

   
     This table is designed to help you understand the charges and expenses
that you, as a shareholder, will bear directly or indirectly when you invest in
the Trust. The table reflects annual operating expenses based on actual
expenses incurred for the fiscal year ended November 30, 1997.

                                                         CLASS A       CLASS B
                                                     --------------   ----------
SHAREHOLDER TRANSACTION EXPENSES:
 Maximum Initial Sales Charge on Purchases
  (as a percentage of offering price) ............        2.50%(1)      none
 Maximum Sales Charge on Reinvestment
  of Dividends ...................................        none          none
 Maximum Deferred Sales Charge
  (as a percentage of purchase price or
    redemption proceeds, as applicable) ..........        none(1)       2.00%
 Redemption fee(2) ...............................        none          none
 Exchange fee ....................................        none          none
ANNUAL OPERATING EXPENSES
 (as a percentage of average net assets):
 Management fee (after fee reduction)(3) .........        0.00%         0.00%
 12b-1 fees ......................................        0.25%         1.00%
 Other expenses (including transfer agent fees,
  custodian fees and accounting and printing
    expenses) (after expense reduction)(3) .......        0.60%         0.66%
                                                         ------        -----
 TOTAL OPERATING EXPENSES (after fee and expense
  reductions)(3) .................................        0.85%         1.66%
                                                         ======        =====
    

- --------------------
1 Purchases of $1 million or more and purchases by participants in certain
  group plans are not subject to an initial sales charge but may be subject
  to a contingent deferred sales charge ("CDSC") as further described under
  "How to Sell Trust Shares."

   
2 Separate fees (currently $10 and $20, respectively) apply to U.S. and
  international wire transfers of redemption proceeds.
    

3 Pioneering Management Corporation ("PMC") has agreed not to impose all or a
  portion of its management fee and to make other arrangements, if necessary,
  to limit other operating expenses of the Trust to the extent required to
  reduce Class A expenses to 0.85% of the average daily net assets
  attributable to Class A shares; the portion of trust-wide expenses
  attributable to Class B shares will be reduced only to the extent such
  expenses are reduced for Class A shares. This agreement is voluntary and
  temporary and may be revised or terminated at any time.


   
                                                CLASS A      CLASS B
EXPENSES ABSENT FEE AND EXPENSE REDUCTIONS     ---------   ----------
Management Fee .............................      0.50%        0.50%
Other Expenses .............................      0.69%        0.75%
Total Operating Expenses ...................      1.44%        2.25%

 EXAMPLE:

     You would pay the following expenses on a $1,000 investment, with or
without redemption at the end of each time period, assuming a 5% annual return,
reinvestment of all dividends and distributions and that the percentage amounts
listed under "Annual Operating Expenses" remain the same each year.

                                    1 YEAR     3 YEARS     5 YEARS     10 YEARS
                                   --------   ---------   ---------   ---------
Class A Shares ..................     $33        $51         $71       $  127
Class B Shares
- --Assuming complete redemption
  at end of period ..............     $37        $62         $90       $  146*
- --Assuming no redemption ........     $17        $52         $90       $  146*
    

- --------------------
* Class B shares convert to Class A shares five years after purchase;
  therefore, Class A share expenses are used after year five.

   
     THE EXAMPLE IS DESIGNED FOR INFORMATION PURPOSES ONLY, AND SHOULD NOT BE
CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES OR RETURNS. ACTUAL TRUST
EXPENSES AND RETURN WILL VARY FROM YEAR TO YEAR AND MAY BE HIGHER OR LOWER THAN
THOSE SHOWN.

     For further information regarding management fees, 12b-1 fees and other
expenses of the Trust, see "Management of the Trust," "Distribution Plans" and
"How To Buy Trust Shares" in this Prospectus and "Management of the Trust" and
"Underwriting Agreement and Distribution Plans" in the Statement of Additional
Information. The Trust's payment of a 12b-1 fee may result in long-term
shareholders paying more than the economic equivalent of the maximum sales
charge permitted under the Conduct Rules of the National Association of
Securities Dealers, Inc.
    

     The maximum initial sales charge is reduced on purchases of specified
amounts of Class A shares and the value of shares owned in other Pioneer mutual
funds is taken into account in determining the applicable initial sales charge.
See "How to Buy Trust Shares." No sales charge is applied to exchanges of
shares of the Trust for shares of other publicly available Pioneer mutual
funds. See "How to Exchange Trust Shares."


                                       2
<PAGE>

II. FINANCIAL HIGHLIGHTS

   
     The following information has been audited by Arthur Andersen LLP,
independent public accountants. Arthur Andersen LLP's report on the Trust's
financial statements as of November 30, 1997 appears in the Trust's Annual
Report which is incorporated by reference into the Statement of Additional 
Information. The information listed below should be read in conjunction with 
those financial statements. The Annual Report includes more information about 
the Trust's performance and is available free of charge by calling Shareholder 
Services at 1-800-225-6292.
    

PIONEER SHORT-TERM INCOME TRUST
   
SELECTED DATA FOR A CLASS A SHARE OUTSTANDING FOR EACH PERIOD PRESENTED:

<TABLE>
<CAPTION>
                                                                   FOR THE YEAR ENDED NOVEMBER 30,
                                                                   -----------------------------
                                                                        1997           1996
                                                                   -------------- --------------
<S>                                                                    <C>            <C>
Net asset value, beginning of period .............................     $  3.79        $  3.84
                                                                       -------        -------
Increase (decrease) from investment operations:
 Net investment income (loss) ....................................     $  0.21        $  0.24
 Net realized and unrealized gain (loss) on investments ..........          --          (0.05)
                                                                       -------        -------
  Net increase (decrease) from investment operations .............     $  0.21        $  0.19
Distributions to shareholders:
 Net investment income ...........................................       (0.23)         (0.24)
                                                                       -------        -------
Net increase (decrease) in net asset value .......................     $ (0.02)       $ (0.05)
                                                                       -------        -------
Net asset value, end of period ...................................     $  3.77        $  .79
                                                                       =======        =======
Total return* ....................................................        5.64%          5.20%
Ratio of net expenses to average net assets ......................        0.87%++        0.87%++
Ratio of net investment income (loss) to average net assets ......        6.10%++        6.25%++
Portfolio turnover rate ..........................................          31%            65%
Net assets, end of period (in thousands) .........................     $42,058        $54,637
Ratios assuming no waiver of management fees and assumption of
 expenses by PMC and no reduction for fees paid indirectly:
  Net operating expenses .........................................        1.44%          1.33%
  Net investment income (loss) ...................................        5.53%          5.79%
Ratios assuming waiver of management fees and assumption of
 expenses by PMC and reduction for fees paid indirectly:
  Net operating expenses .........................................        0.85%          0.85%
  Net investment income (loss) ...................................        6.12%          6.27%


<CAPTION>
                                                                                                             AUGUST 10
                                                                                                           (COMMENCEMENT
                                                                                                           OF OPERATIONS)
                                                                        FOR THE YEAR ENDED NOVEMBER 30,          TO
                                                                        -------------------------------      NOVEMBER 30,
                                                                        1995         1994+        1993          1992
                                                                   -------------- ----------- ----------- ---------------
<S>                                                                    <C>          <C>         <C>           <C>
Net asset value, beginning of period .............................     $  3.75      $  3.95     $  3.95       $  4.00
                                                                       -------      ------      -------       -------
Increase (decrease) from investment operations:
 Net investment income (loss) ....................................     $  0.25      $  0.22     $  0.24       $  0.08
 Net realized and unrealized gain (loss) on investments ..........        0.10        (0.21)         --         (0.05)
                                                                       -------      -------     -------       -------
  Net increase (decrease) from investment operations .............     $  0.35      $  0.01     $  0.24       $  0.03
Distributions to shareholders:
 Net investment income ...........................................       (0.26)       (0.21)      (0.24)        (0.08)
                                                                       -------      -------     -------       -------
Net increase (decrease) in net asset value .......................     $  0.09      $ (0.20)    $    --       $ (0.05)
                                                                       -------      -------     -------       -------
Net asset value, end of period ...................................     $  3.84      $  3.75     $  3.95       $  3.95
                                                                       =======      =======     =======       =======
Total return* ....................................................        9.64%        0.32%       6.28%         0.79%
Ratio of net expenses to average net assets ......................        0.86%++      0.85%       0.66%         0.50%**
Ratio of net investment income (loss) to average net assets ......        6.43%++      5.89%       5.80%         5.93%**
Portfolio turnover rate ..........................................         110%         144%         83%          146%**
Net assets, end of period (in thousands) .........................     $53,860      $59,088     $57,482       $15,588
Ratios assuming no waiver of management fees and assumption of
 expenses by PMC and no reduction for fees paid indirectly:
  Net operating expenses .........................................        1.38%        1.20%       1.33%         3.40%**
  Net investment income (loss) ...................................        5.92%        5.54%       5.13%         3.03%**
Ratios assuming waiver of management fees and assumption of
 expenses by PMC and reduction for fees paid indirectly:
  Net operating expenses .........................................        0.85%          --          --            --
  Net investment income (loss) ...................................        6.44%          --          --            --
</TABLE>
    

- -----------
   
 +Per share data based upon average shares outstanding for the period
  presented.

++Ratios assuming no reduction for fees paid indirectly.
    
 *Assumes initial investment at net asset value at the beginning of each
  period, reinvestment of all distributions, the complete redemption of the
  investment at net asset value at the end of each period, and no sales
  charges. Total return would be reduced if sales charges were taken into
  account.

**Annualized.
      

                                       3
<PAGE>

II. FINANCIAL HIGHLIGHTS (CONTINUED)


PIONEER SHORT-TERM INCOME TRUST
   
SELECTED DATA FOR A CLASS B SHARE OUTSTANDING FOR EACH PERIOD PRESENTED:

<TABLE>
<CAPTION>
                                                                                          FOR THE YEAR ENDED NOVEMBER 30,
                                                                                   --------------------------------------------
                                                                                        1997           1996           1995
                                                                                   -------------- -------------- --------------
<S>                                                                                     <C>            <C>            <C>
Net asset value, beginning of period .............................................      $ 3.79         $ 3.85         $ 3.75
                                                                                        ------         ------         ------
Increase (decrease) from investment operations:
 Net investment income (loss) ....................................................      $ 0.20         $ 0.21         $ 0.22
 Net realized and unrealized gain (loss) on investments ..........................       (0.03)         (0.05)          0.11
                                                                                        ------         ------         ------
  Net increase (decrease) from investment operations .............................      $ 0.17         $ 0.16         $ 0.33
Distributions to shareholders:
 Net investment income ...........................................................       (0.20)         (0.21)         (0.23)
 In excess of net investment income ..............................................          --          (0.01)            --
                                                                                        ------         ------         ------
Net increase (decrease) in net asset value .......................................      $(0.03)        $(0.06)        $ 0.10
                                                                                        ------         ------         ------
Net asset value, end of period ...................................................      $ 3.76         $ 3.79         $ 3.85
                                                                                        ======         ======         ======
Total return* ....................................................................        4.60%          4.37%          8.93%
Ratio of net expenses to average net assets ......................................        1.67%++        1.69%++        1.63%++
Ratio of net investment income (loss) to average net assets ......................        5.29%++        5.40%++        5.61%++
Portfolio turnover rate ..........................................................          31%            65%           110%
Net assets, end of period (in thousands) .........................................      $5,187         $4,969         $2,924
Ratios assuming no waiver of management fees and assumption of expenses by PMC and
 no reduction for fees paid indirectly:
  Net operating expenses .........................................................        2.25%          2.15%          2.17%
  Net investment income (loss) ...................................................        4.71%          4.94%          5.08%
Ratios assuming waiver of management fees and assumption of expenses by PMC and a
 reduction for fees paid indirectly:
  Net operating expenses .........................................................        1.66%          1.67%          1.60%
  Net investment income (loss) ...................................................        5.30%          5.42%          5.64%


<CAPTION>
                                                                                         APRIL 4
                                                                                            TO
                                                                                    NOVEMBER 30, 1994+
                                                                                   -------------------
<S>                                                                                       <C>
Net asset value, beginning of period .............................................        $ 3.89
                                                                                          -----
Increase (decrease) from investment operations:
 Net investment income (loss) ....................................................        $ 0.15
 Net realized and unrealized gain (loss) on investments ..........................         (0.16)
                                                                                          ------
  Net increase (decrease) from investment operations .............................        $(0.01)
Distributions to shareholders:
 Net investment income ...........................................................         (0.13)
 In excess of net investment income ..............................................            --
                                                                                          ------
Net increase (decrease) in net asset value .......................................        $(0.14)
                                                                                          ------
Net asset value, end of period ...................................................        $3.75
                                                                                          ======
Total return* ....................................................................         (0.24%)
Ratio of net expenses to average net assets ......................................          1.41%**
Ratio of net investment income (loss) to average net assets ......................          6.05%**
Portfolio turnover rate ..........................................................           144%
Net assets, end of period (in thousands) .........................................        $3,182
Ratios assuming no waiver of management fees and assumption of expenses by PMC and
 no reduction for fees paid indirectly:
  Net operating expenses .........................................................          1.82%**
  Net investment income (loss) ...................................................          5.64%**
Ratios assuming waiver of management fees and assumption of expenses by PMC and a
 reduction for fees paid indirectly:
  Net operating expenses .........................................................            --
  Net investment income (loss) ...................................................            --
</TABLE>
    

- -----------
   
 +Per share data based upon average shares outstanding for the period
  presented.

++Ratios assuming no reduction for fees paid indirectly.
    
 *Assumes initial investment at net asset value at the beginning of each
  period, reinvestment of all distributions, the complete redemption of the
  investment at net asset value at the end of each period, and no sales
  charges. Total return would be reduced if sales charges were taken into
  account.

**Annualized.

                                       4
<PAGE>

III. INVESTMENT OBJECTIVE AND POLICIES

   
     THE TRUST'S INVESTMENT OBJECTIVE IS A HIGH LEVEL OF CURRENT INCOME
CONSISTENT WITH A RELATIVELY HIGH LEVEL OF PRINCIPAL STABILITY. THE TRUST
INVESTS IN:
    

   [bullet] Debt securities issued or guaranteed by the U.S. government or its
            agencies or instrumentalities;

   [bullet] Other debt securities including corporate debt securities such as
            bonds, notes and debentures; mortgage-backed securities including
            collateralized mortgage obligations ("CMOs"); other asset-backed
            securities; debt securities of foreign issuers including foreign
            corporations, banks, governments and supranational organizations;
            and commercial paper, including variable and floating rate paper;
            and

   [bullet] Short-term money market instruments including time deposits and
            certificates of deposit maturing in one year or less, repurchase
            agreements maturing in one week or less, and banker's acceptances.

Although the Trust may invest without limit in short-term obligations of
foreign issuers when PMC as the Trust's investment adviser deems it
advantageous to do so, under normal circumstances not more than 25% of the
Trust's total assets will be invested in securities of foreign issuers (see
"Foreign Investments" below). The Trust may also purchase securities on a
"when-issued" or forward commitment basis and may lend portfolio securities
having a value up to 5% of its total assets.

QUALITY
   
     Under normal circumstances, the Trust invests at least 85% of its total
assets in securities that are issued or guaranteed by the U.S. government or
its agencies or instrumentalities or that are rated in the highest three grades
by the major recognized rating services or, if unrated, are judged to be of
comparable quality by PMC. The remainder of the Trust's investments must be
rated within the four highest grades of the major rating services (i.e., at
least "Baa" by Moody's Investors Service, Inc. or "BBB" by Standard & Poor's
Ratings Group, or their equivalents) or, if not rated, judged to be of
comparable quality. Securities rated BBB or Baa are considered investment grade
securities having adequate capacity to pay interest and repay principal. Such
securities may have speculative characteristics, however, and changes in
economic and other conditions are more likely to lead to a weakened capacity of
the issuer of such securities to make principal and interest payments than is
the case with higher rated securities. In the event that the credit quality of
a security falls below investment grade subsequent to purchase, the Trust will
sell such security as soon as PMC determines it is prudent to do so. No more
than 5% of the Trust's assets may be invested in securities that are rated
below investment grade. For a description of ratings, see the Statement of
Additional Information.
    

MATURITY
   
     The dollar-weighted average maturity of the Trust's portfolio will not
exceed three years. Generally, the Trust invests only in securities with
remaining maturities of five years or less. For purposes of these policies, an
instrument will be treated as having a maturity earlier than its stated
maturity date if the instrument has technical features (such as puts, demand,
prepayment or redemption features) or a variable rate of interest which, based
on projected cash flows from the instrument, will in the judgment of PMC result
in the instrument being valued in the market as though it has the earlier
maturity. If a security's estimated remaining maturity changes from under five
years to over five years, PMC will decide either to sell or retain the security
based on its determination of the best interests of the Trust.

U.S. GOVERNMENT SECURITIES AND MORTGAGE AND OTHER ASSET-BACKED SECURITIES
    
     Subject to its policies concerning remaining maturities and average
portfolio maturity, the Trust may invest in a variety of U.S. government
securities, including (1) U.S. Treasury obligations, which differ only in their
interest rates, stated maturities and times of issuance: U.S. Treasury bills
(stated maturities of one year or less), U.S. Treasury notes (stated maturities
of one to ten years) and U.S. Treasury bonds (generally stated maturities of
greater than ten years) and (2) obligations of varying stated maturities issued
or guaranteed by certain agencies and instrumentalities of the U.S. government,
such as mortgage participation certificates guaranteed by the Government
National Mortgage Association ("GNMA"), the Federal National Mortgage
Association ("FNMA") and the Federal Home Loan Mortgage Corporation ("FHLMC")
and Federal Housing Administration debentures.

   
     Certain U.S. government securities, including U.S. Treasury bills, notes
and bonds, and GNMA certificates, are supported by the full faith and credit of
the U.S. Certain other U.S. government securities issued or guaranteed by
federal agencies or government sponsored enterprises, such as securities of the
Federal Home Loan Banks, are not supported by the full faith and credit of the
U.S., but may be supported by the right of the issuer to borrow from the U.S.
Treasury. Other obligations, such as those of FHLMC and FNMA, are supported by
the discretionary authority of the U.S. government to purchase the agency's
securities although it has no legal obligation to do so. Still other
obligations are supported only by the credit of the instrumentality itself.
    

     GNMA, FHLMC and FNMA, as well as private entities, issue mortgage-backed
securities which provide monthly payments which are, in effect, a
"pass-through" of the monthly interest and principal payments (including any
prepayments) made by the individual borrowers on the pooled mortgage loans.
Private issuers of such securities include banks, broker-dealers, mortgage
corporations and other financial institutions.

     The Trust may invest in CMOs, which are obligations fully collateralized
by a portfolio of mortgages or mortgage-related securities. Payments of
principal and interest on the mortgages are passed through to the holders of
the CMOs on the same schedule as they are received, although certain classes of
CMOs have priority over others with respect to the receipt of prepayments on
the mortgages. Therefore, depending on the type of CMOs in which the Trust
invests, the investment may be subject to a greater or lesser risk of
prepayment than other types of mortgage-related securities. A real estate
mortgage investment conduit ("REMIC") is a form of CMO that qualifies for
special tax treatment under the Internal Revenue Code of 1986, as

                                       5
<PAGE>

amended (the "Code"). The Trust may acquire "regular" interests in REMICs but
does not intend, under current tax law, to acquire residual interests in
REMICs. Mortgage-backed securities may be less effective than traditional debt
obligations of similar maturity at maintaining yields during periods of
declining interest rates.

     Other asset-backed securities in which the Trust may invest represent
interests in pools of consumer loans unrelated to mortgage loans and most often
are structured as pass-through securities. Interest and principal payments
ultimately depend on payment of the underlying loans by individuals, although
the securities may be supported by letters of credit or other credit
enhancements. The value of such asset-backed securities may also depend on the
creditworthiness of the servicing agent for the loan pool, the originator of
the loans or the financial institution providing the credit enhancement.

FOREIGN INVESTMENTS

     Under normal circumstances the Trust does not invest more than 25% of its
total assets in the securities of foreign issuers (which term excludes for
these purposes Canadian issuers). When PMC believes, however, that it is in the
best interest of the Trust, the Trust may invest without any limitation in
short-term foreign debt securities. These foreign investments may be issued by
foreign governments, banks or corporations, as well as foreign branches of U.S.
banks and certain supranational organizations such as the World Bank and the
European Union. The Trust's foreign investments may be denominated in U.S.
dollars or selected foreign currencies. The Trust does not currently hold any
non-U.S. dollar denominated security and does not intend to purchase such
securities in the coming year. Foreign investments are subject to the Trust's
quality and maturity policies described above.

   
     Investing in securities of foreign companies and countries involves
certain considerations and risks which are not typically associated with
investing in U.S. government securities and securities of U.S. companies.
Foreign companies are not subject to uniform accounting, auditing and financial
standards and requirements comparable to those applicable to U.S. companies.
There may also be less government supervision and regulation of foreign
securities exchanges, brokers and listed companies than exists in the U.S.
Interest or, in some cases, capital gains from foreign investments may be
subject to withholding or other foreign taxes which will decrease the net
return on such investments as compared to the return on the Trust's U.S.
investments. In addition, there may be the possibility of expropriation,
confiscatory taxation, political, economic or social instability, or diplomatic
developments which could affect assets of the Trust held in foreign countries.

     The value of foreign securities may also be adversely affected by
fluctuations in the relative rates of exchange between the currencies of
different nations and by exchange control regulations. There may be less
publicly available information about foreign companies compared to reports and
ratings published about U.S. companies. Foreign securities markets have
substantially less trading volume than U.S. markets and securities of some
foreign companies are less liquid and more volatile than securities of
comparable U.S. companies. Transaction costs on foreign securities exchanges
are generally higher than in the U.S.
    

     The Trust's investments in securities denominated in foreign currencies
are also subject to currency risk, as the U.S. dollar value of these securities
may be favorably or unfavorably affected by changes in foreign currency
exchange rates and exchange control regulations. Currency exchange rates may
fluctuate significantly over short periods of time causing, among other
factors, the Trust's net asset value to fluctuate as well. Currency exchange
rates are generally determined by forces of supply and demand and the perceived
relative merits of investments in various countries, but can be affected
unpredictably by intervention from U.S. and foreign governments or central
banks, political events and currency control measures.

     The Trust has the ability to hold a portion of its assets in foreign
currencies and to enter into forward foreign currency contracts to facilitate
settlement of foreign securities transactions or to protect against changes in
foreign currency exchange rates. A forward foreign currency contract involves
an obligation to purchase or sell a specific currency on a future date, at a
price set at the time of the contract. The Trust might sell a foreign currency
on either a spot or forward basis to hedge against an anticipated decline in
the dollar value of securities in its portfolio or securities it intends or has
contracted to sell or to preserve the U.S. dollar value of dividends, interest
or other amounts it expects to receive. Although this strategy could minimize
the risk of loss due to a decline in the value of the hedged foreign currency,
it could also limit any potential gain which might result from an increase in
the value of the currency. Alternatively, the Trust might purchase a foreign
currency or enter into a forward purchase contract for the currency to preserve
the U.S. dollar price of securities it is authorized to purchase or has
contracted to purchase.

   
     The Trust may also engage in cross-hedging by using forward contracts in
one currency to hedge against fluctuations in the value of securities
denominated in a different currency if PMC determines that there is a pattern
of correlation between the two currencies. Cross-hedging may also include
entering into a forward transaction involving two foreign currencies, using one
foreign currency as a proxy for the U.S. dollar to hedge against variations in
the other foreign currency if PMC determines that there is a pattern of
correlation between the proxy currency and the U.S. dollar. To the extent that
the expected correlation between two particular currencies is imperfect, a
forward transaction will not be an effective hedge and the Trust may be exposed
to a loss, which loss may exceed the loss that would have occurred if a cross-
   hedge were not attempted.
    

     If the Trust enters into a forward contract to buy foreign currency for
any purpose, the Trust will be required to place cash or high grade liquid debt
securities in a segregated account of the Trust in an amount equal to the value
of the Trust's total assets committed to the consummation of the forward
contract. The Trust may enter into forward currency contracts having an
intrinsic value of up to 25% of its net

                                       6
<PAGE>

assets. Forward contracts are subject to the risk that the counterparty to such
contract will default on its obligations. Since a forward contract is not
guaranteed by an exchange or clearinghouse, a default would deprive the Trust
of unrealized profits or the benefits of a currency hedge and may force the
Trust to cover its purchase or sale commitments, if any, at the current market
price.

PORTFOLIO TRADING
   
     The Trust's portfolio is fully managed by purchasing and selling
securities, as well as holding selected securities to maturity. While the Trust
does not normally engage in trading for short-term profits, the Trust engages
in portfolio trading of securities regardless of the length of time the Trust
has held the securities if it believes a transaction net of costs (including
custodian fees) will contribute to the achievement of its investment objective.
 

     Any such changes in the portfolio may result in increases or decreases in
the Trust's current income available for distribution to shareholders and in
its holding of debt securities which sell at moderate to substantial premiums
or discounts from face value. If the Trust's expectations of changes in
interest rates or its evaluation of the normal yield relationships between two
securities prove to be incorrect, the Trust's income, net asset value and
potential gain may be reduced or its potential loss may be increased. An
increase in interest rates will generally reduce the value of portfolio
investments (and, therefore, the net asset value of the shares of the Trust),
and a decline in interest rates will generally increase their value. See
"Financial Highlights" for actual portfolio turnover rates.
    

REPURCHASE AGREEMENTS

     The Trust may enter into repurchase agreements, generally not exceeding
seven days. Such repurchase agreements will be fully collateralized with U.S.
Treasury and/or U.S. government agency obligations with a market value of not
less than 100% of the obligation, valued daily. Collateral will be held by the
Trust's custodian in a segregated, safekeeping account for the benefit of the
Trust. In the event that a repurchase agreement is not fulfilled, the Trust
could suffer a loss to the extent that the value of the collateral falls below
the repurchase price or if the Trust is prevented from realizing the value of
the collateral by reason of an order of a court with jurisdiction over an
insolvency proceeding with respect to the other party to the repurchase
agreement.

                ----------------------------------------------

     The Trust's investment objective is fundamental and cannot be changed
without shareholder approval. Other investment policies and restrictions are
described in the Trust's Statement of Additional Information. Since all
investments are subject to risks and fluctuations in value due to economic
conditions and other factors, there can be no assurance that the Trust will
achieve its investment objective.

IV. MANAGEMENT OF THE TRUST
   
     The Trust's Board of Trustees has overall responsibility for management
and supervision of the Trust. The Board meets at least quarterly. By virtue of
the functions performed by PMC as investment adviser, the Trust requires no
employees other than its executive officers, all of whom receive their
compensation from PMC or other sources. The Statement of Additional Information
contains the name and general business and professional background of each
Trustee and executive officer of the Trust.

     The Trust is managed under a contract with PMC. PMC serves as investment
adviser to the Trust and is responsible for the overall management of the
Trust's business affairs, subject only to the authority of the Board of
Trustees. PMC is a wholly owned subsidiary of The Pioneer Group, Inc. ("PGI"),
a publicly traded Delaware corporation. Pioneer Funds Distributor, Inc.
("PFD"), an indirect wholly owned subsidiary of PGI, is the principal
underwriter of the shares of the Trust.

     John F. Cogan, Jr., Chairman and President of the Trust, President and a
Director of PGI, and Chairman and a Director of PMC and PFD, owned
approximately 14% of the outstanding capital stock of PGI as of the date of
this Prospectus.
    

     Mr. David Tripple, President and Chief Investment Officer of PMC and
Executive Vice President of each Pioneer mutual fund, has general
responsibility for PMC's investment operations and chairs a committee of PMC's
fixed income managers which reviews PMC's research and portfolio operations,
including those of the Trust. Mr. Tripple joined PMC in 1974.

     Research and management of the Trust is the responsibility of a team of
portfolio managers and analysts focusing on fixed income securities. Members of
the team meet regularly to discuss holdings, prospective investments and
portfolio composition. Mr. Sherman Russ, a Senior Vice President of PMC and
Vice President of the Trust, is the senior member of the team. Mr. Russ joined
PMC in 1983.

   
     Day-to-day management of the Trust has been the responsibility of Mr.
Richard A. Schlanger, a Vice President of PMC and the Trust, since August 1992.
Mr. Schlanger joined PMC in 1988 and has over 11 years of investment
experience.
    

     In addition to the Trust, PMC also manages and serves as the investment
adviser for other mutual funds and is an investment adviser to certain other
institutional accounts. PMC's and PFD's executive offices are located at 60
State Street, Boston, Massachusetts 02109. In an effort to avoid conflicts of
interest with the Trust, the Trust and PMC have adopted a Code of Ethics that
is designed to maintain a high standard of personal conduct by directing that
all personnel defer to the interests of the Trust and its shareholders in
making personal securities transactions.

     Under the terms of its contract with the Trust, PMC assists in the
management of the Trust and is authorized in its discretion to buy and sell
securities for the account of the Trust. PMC pays all the expenses, including
executive salaries and the rental of office space, relating to its services for
the Trust, with the exception of the following which are to be paid by the
Trust: (a) taxes and other governmental charges, if any; (b) interest on
borrowed money, if any; (c) legal fees and expenses; (d) auditing fees; (e)
insurance premiums; (f) dues and fees for membership in trade associations; (g)
fees and expenses of registering and maintaining registrations by the Trust of
its shares with regulatory agencies, individual states,

                                       7
<PAGE>

   
territories and foreign jurisdictions and of preparing reports to regulatory
agencies; (h) fees and expenses of Trustees not affiliated with or interested
persons of PMC; (i) fees and expenses of the custodian, dividend disbursing
agent, transfer agent and registrar; (j) issue and transfer taxes chargeable to
the Trust in connection with securities transactions to which the Trust is a
party; (k) costs of reports to shareholders, shareholders' meetings and
Trustees' meetings; (l) the cost of certificates representing shares of the
Trust; (m) charges and expenses for determining from time to time the value of
the Trust's net assets and the keeping of its books and records; and (n)
certain distribution fees pursuant to its plan of distribution. The Trust also
pays any brokerage commissions in connection with its portfolio transactions.
    

     Orders for the Trust's portfolio securities transactions are placed by
PMC, which strives to obtain the best price and execution for each transaction.
In circumstances in which two or more broker-dealers are in a position to offer
comparable prices and execution, consideration may be given to whether the
broker-dealer provides investment research or brokerage services or sells
shares of any Pioneer mutual fund or other funds for which PMC or any affiliate
or subsidiary serves as investment adviser or manager. See the Statement of
Additional Information for a further description of PMC's brokerage allocation
practices.

     As compensation for its management services and certain expenses which PMC
incurs, PMC is entitled to a management fee equal to 0.50% per annum of the
Trust's average daily net assets up to $100 million, 0.45% of the next $200
million, and 0.40% on assets over $300 million. The fee is normally computed
daily and paid monthly.

   
     PMC has agreed not to impose all or a portion of its management fee and to
make other arrangements, if necessary, to limit other expenses of the Trust to
the extent required to reduce Class A expenses to 0.85% of the average daily
net assets attributable to Class A shares; the portion of the Trust-wide
expenses attributable to Class B shares will be reduced only to the extent such
expenses are reduced for Class A shares. This agreement is voluntary and
temporary and may be revised or terminated at any time. See the Statement of
Additional Information for more information.

     Certain information technology experts currently predict the possibility
of a widespread failure of computer systems and certain other equipment which
will be triggered on or after certain dates--primarily January 1, 2000--due to
a systemic inability to process date-related information. This scenario,
commonly known as the "Year 2000 Problem," could have an adverse impact on
individuals and businesses, including the Trust and other mutual funds and
financial organizations. PMC and its affiliates are taking steps believed to be
adequate to address the Year 2000 Problem with respect to the systems and
equipment controlled by the Trust's investment adviser, broker-dealer and
transfer agent. In addition, other entities providing services to the Trust and
its shareholders are being asked to provide assurances that they have
undertaken similar measures with respect to their systems and equipment.
Although PMC is not expecting any adverse impact to it or its clients from the
Year 2000 problem, it can not provide complete assurances that its efforts or
the efforts of its key vendors will be successful.
    

V. TRUST SHARE ALTERNATIVES
   
     The Trust continuously offers three Classes of shares designated as Class
A, Class B and Class Y shares. Information with regard to Class Y shares of the
Trust is available in a separate prospectus. Class A and Class B shares are
described more fully in "How to Buy Trust Shares." If you do not specify in
your instructions to the Trust which Class of shares you wish to purchase,
exchange or redeem, the Trust will assume that your instructions apply to Class
A shares.

     CLASS A SHARES. If you invest less than $1 million in Class A shares, you
will pay an initial sales charge. Certain purchases may qualify for reduced
initial sales charges. If you invest $1 million or more in Class A shares, no
sales charge will be imposed at the time of purchase; however, shares redeemed
within 12 months of purchase may be subject to a CDSC. Class A shares are
subject to distribution and service fees at a combined annual rate of up to
0.25% of the Trust's average daily net assets attributable to Class A shares.
    

     CLASS B SHARES. If you plan to invest up to $250,000, Class B shares are
available to you. Class B shares are sold without an initial sales charge, but
are subject to a CDSC of up to 2% if redeemed within three years. Class B
shares are subject to distribution and service fees at a combined annual rate
of 1% of the Trust's average daily net assets attributable to Class B shares.
Your entire investment in Class B shares is available to work for you from the
time you make your investment, but the higher distribution fee paid by Class B
shares will cause your Class B shares (until conversion) to have a higher
expense ratio and to pay lower dividends, to the extent dividends are paid,
than Class A shares. Class B shares will automatically convert to Class A
shares, based on relative net asset value, approximately five years after the
initial purchase.

     PURCHASING CLASS A OR CLASS B SHARES. The decision as to which Class to
purchase depends on the amount you invest, the intended length of the
investment and your personal situation. If you are making an investment that
qualifies for reduced sales charges, you might consider Class A shares. If you
prefer not to pay an initial sales charge on an investment of $250,000 or less
and you plan to hold the investment for at least three years, you might
consider Class B shares.

   
     Investment dealers or their representatives may receive different
compensation depending on which Class of shares they sell. Shares may be
exchanged only for shares of the same Class of another Pioneer mutual fund, and
shares acquired in the exchange will continue to be subject to any CDSC
applicable to the shares of the Trust originally purchased. Shares sold outside
the U.S. to persons who are not U.S. citizens may be subject to different sales
charges, CDSCs and dealer compensation arrangements in accordance with local
laws and business practices.
    

VI. SHARE PRICE

     Shares of the Trust are sold at the public offering price, which is the
net asset value per share, plus any applicable

                                       8
<PAGE>

sales charge. The net asset value per share of each Class of the Trust is
determined by dividing the value of its assets, less liabilities attributable
to that Class, by the number of shares of that Class outstanding. The net asset
value is computed once daily, on each day the New York Stock Exchange (the
"Exchange") is open, as of the close of regular trading on the Exchange.

   
     Securities are valued at the last sale price on the principal exchange or
market where they are traded. Securities which have not traded on the date of
valuation or securities for which sales prices are not generally reported are
valued at the mean between the current bid and asked prices. Securities quoted
in foreign currencies are converted to U.S. dollars utilizing foreign exchange
rates employed by the Trust's independent pricing services. Generally, trading
in foreign securities is substantially completed each day at various times
prior to the close of regular trading on the Exchange. The values of such
securities used in computing the net asset value of the Trust's shares are
determined as of such times. Foreign currency exchange rates are also generally
determined prior to the close of regular trading on the Exchange. Occasionally,
events which affect the values of such securities and such exchange rates may
occur between the times at which they are determined and the close of regular
trading on the Exchange and will therefore not be reflected in the computation
of the Trust's net asset value. If events materially affecting the value of
such securities occur during such period, then these securities may be valued
at their fair value as determined in good faith by the Trustees. All assets of
the Trust for which there is no other readily available valuation method are
valued at their fair value as determined in good faith by the Trustees.
    

VII. HOW TO BUY TRUST SHARES

     YOU MAY BUY TRUST SHARES FROM ANY SECURITIES BROKER-DEALER WHICH HAS A
SALES AGREEMENT WITH PFD. IF YOU DO NOT HAVE A SECURITIES BROKER-DEALER, PLEASE
CALL 1-800-225-6292. SHARES WILL BE PURCHASED AT THE PUBLIC OFFERING PRICE, THAT
IS, THE NET ASSET VALUE PER SHARE, PLUS ANY APPLICABLE SALES CHARGE, NEXT
COMPUTED AFTER RECEIPT OF A PURCHASE ORDER, EXCEPT AS SET FORTH BELOW.

   
     The minimum initial investment is $5,000 for Class A and Class B shares
except as specified below. The minimum initial investment is $100 for Class A
accounts being established to utilize monthly bank drafts, government
allotments, payroll deduction and other similar automatic investment plans.
Separate minimum investment requirements apply to retirement plans and to
telephone and wire orders placed by broker-dealers; no sales charges or minimum
requirements apply to the reinvestment of dividends or capital gains
distributions. The minimum subsequent investment is $100 for Class A shares and
$500 for Class B shares, except that the subsequent minimum investment amount
for Class B share accounts may be as little as $50 if an automatic investment
plan is established (see "Automatic Investment Plans").
    

     TELEPHONE PURCHASES. Your account is automatically authorized to have the
telephone purchase privilege unless you indicate otherwise on your Account
Application or by writing to Pioneering Services Corporation ("PSC"). The
telephone purchase option may be used to purchase additional shares for an
existing Pioneer mutual fund account; it may not be used to establish a new
account. Proper account identification will be required for each telephone
purchase. A maximum of $25,000 per account may be purchased by telephone each
day. The telephone purchase privilege is available to Individual Retirement
Accounts ("IRAs") but may not be available to other types of retirement plan
accounts. Call PSC for more information.

     YOU ARE STRONGLY URGED TO CONSULT WITH YOUR FINANCIAL REPRESENTATIVE PRIOR
TO REQUESTING A TELEPHONE PURCHASE. To purchase shares by telephone, you must
establish your bank account of record by completing the appropriate section of
your Account Application or an Account Options Form. PSC will electronically
debit the amount of each purchase from this predesignated bank account.
Telephone purchases may not be made for 30 days after the establishment of your
bank of record or any change to your bank information.

   
     Telephone purchases will be priced at the net asset value plus any
applicable sales charge next determined after PSC's receipt of a telephone
purchase instruction and receipt of good funds (usually three days after the
purchase instruction). You may always elect to deliver purchases to PSC by
mail. See "Telephone Transactions" for additional information.
    

CLASS A SHARES

     You may buy Class A shares at the public offering price, including a sales
charge, as follows:

                           SALES CHARGE AS A % OF      DEALER 
                           -----------------------    ALLOWANCE
                                            NET       AS A % OF   
                            OFFERING      AMOUNT      OFFERING
   AMOUNT OF PURCHASE         PRICE      INVESTED       PRICE
- ------------------------   ----------   ----------   ----------
Less than $50,000              2.50%        2.56%       2.00%

$50,000 but less than
  $100,000                     2.00         2.06        1.75

$100,000 but less than
  $250,000                     1.50         1.52        1.25

$250,000 but less than
  $1,000,000                   1.00         1.01        1.00

$1,000,000 or more              -0-          -0-     see below

     The schedule of sales charges above is applicable to purchases of Class A
shares of the Trust by (i) an individual, (ii) an individual and his or her
spouse and children under the age of 21 and (iii) a trustee or other fiduciary
of a trust estate or fiduciary account or related trusts or accounts including
pension, profit-sharing and other employee benefit trusts qualified under
Section 401 or 408 of the Code, although more than one beneficiary is involved.
The sales charges applicable to a current purchase of Class A shares of the
Trust by a person listed above is determined by adding the value of shares to
be purchased to the aggregate value (at the then current offering price) of
shares of any of the other Pioneer mutual funds previously purchased and then
owned, provided PFD is notified by such person or his or her broker-dealer each
time a purchase is made which would qualify. Pioneer mutual funds include all
mutual funds for which PFD serves as principal underwriter. At the sole
discretion of PFD, holdings of funds domiciled outside the U.S., but which are
managed by affiliates of PMC, may be included for this purpose.

                                       9
<PAGE>

     No sales charge is payable at the time of purchase on investments of $1
million or more or for purchases by participants in certain group plans
(described below) subject to a CDSC of 0.50% which may be imposed in the event
of a redemption of Class A shares within 12 months of purchase. See "How to
Sell Trust Shares." PFD may, in its discretion, pay a commission to
broker-dealers who initiate and are responsible for such purchases as follows:
0.50% on sales of $1 million to $5 million; and 0.10% on the excess over $5
million. These commissions will not be paid if the purchaser is affiliated with
the broker-dealer or if the purchase represents the reinvestment of a
redemption made during the previous 12 calendar months. Broker-dealers who
receive a commission in connection with Class A share purchases at net asset
value by 401(a) or 401(k) retirement plans with 1,000 or more eligible
participants or with at least $10 million in plan assets will be required to
return any commission paid or a pro rata portion thereof if the retirement plan
redeems its shares within 12 months of purchase. See also "How to Sell Trust
Shares." In connection with PGI's acquisition of Mutual of Omaha Fund
Management Company and contingent upon the achievement of certain sales
objectives, PFD may pay to Mutual of Omaha Investor Services, Inc. 50% of PFD's
retention of any sales commission on sales of the Trust's Class A shares
through such dealer. From time to time, PFD may elect to reallow the entire
initial sales charge to participating dealers for all sales of Class A shares
with respect to which orders are placed during a particular period. Dealers to
whom substantially the entire sales charge is reallowed may be deemed to be
underwriters under the federal securities laws.

     QUALIFYING FOR A REDUCED SALES CHARGE. Class A shares of the Trust may be
sold at a reduced or eliminated sales charge to certain group plans ("Group
Plans") under which a sponsoring organization makes recommendations to, permits
group solicitation of, or otherwise facilitates purchases by, its employees,
members or participants. Class A shares of the Trust may be sold at net asset
value without a sales charge to 401(k) retirement plans with 100 or more
participants or at least $500,000 in plan assets. Information about such
arrangements is available from PFD.

   
     Class A shares of the Trust may also be sold at net asset value per share
without a sales charge to: (a) current or former Trustees and officers of the
Trust and partners or employees of its legal counsel; (b) current or former
directors, officers, employees or sales representatives of PGI or its
subsidiaries; (c) current or former directors, officers, employees or sales
representatives of any subadviser or predecessor investment adviser to any
investment company for which PMC serves as investment adviser, and the
subsidiaries or affiliates of such persons; (d) current or former officers,
partners, employees or registered representatives of broker-dealers which have
entered into sales agreements with PFD; (e) members of the immediate families
of any of the persons above; (f) any trust, custodian, pension, profit-sharing
or other benefit plan of the foregoing persons; (g) insurance company separate
accounts; (h) certain "wrap accounts" for the benefit of clients of financial
planners adhering to standards established by PFD; (i) other funds and accounts
for which PMC or any of its affiliates serves as investment adviser or manager;
and (j) certain unit investment trusts. Shares so purchased are purchased for
investment purposes and may not be resold except through redemption or
repurchase by or on behalf of the Trust. The availability of this privilege is
conditioned on the receipt by PFD of written notification of eligibility. Class
A shares of the Trust may be sold at net asset value per share without a sales
charge to Optional Retirement Program (the "Program") participants if (i) the
employer has authorized a limited number of investment company providers for
the Program, (ii) all authorized investment company providers offer their
shares to Program participants at net asset value, (iii) the employer has
agreed in writing to actively promote the authorized investment providers to
Program participants and (iv) the Program provides for a matching contribution
for each participant contribution. Class A shares of the Trust may also be sold
at net asset value without a sales charge in connection with certain
reorganization, liquidation or acquisition transactions involving other
investment companies or personal holding companies.
    

     Reduced sales charges are available for purchases of $50,000 or more of
Class A shares (excluding any reinvestments of dividends and capital gains
distributions) made within a 13-month period pursuant to a Letter of Intent
("LOI") which may be established by completing the Letter of Intent section of
the Account Application. The reduced sales charge will be the charge that would
be applicable to the purchase of the specified amount of Class A shares as if
the shares had all been purchased at the same time. A purchase not made
pursuant to an LOI may be included if the LOI is submitted to PSC within 90
days of such purchase. You may also obtain the reduced sales charge by
including the value (at current offering price) of all your Class A shares in
the Trust and all other Pioneer mutual funds held of record as of the date of
your LOI in the amount used to determine the applicable sales charge for the
Class A shares to be purchased under the LOI. Five percent of your total
intended purchase amount will be held in escrow by PSC, registered in your
name, until the terms of the LOI are fulfilled.

   
     You are not obligated to purchase the amount specified in your LOI. If,
however, the amount actually purchased during the 13-month period is more or
less than that indicated in your LOI, an adjustment in the sales charge will be
made. If a payment to cover actual sales charges is due, it must be paid to PFD
within 20 days after PFD or your dealer sends you a written request otherwise
PFD will direct PSC to liquidate sufficient shares from your escrow account to
cover the amount due. See the Statement of Additional Information for more
information.
    

     Investors who are clients of a broker-dealer with a current sales
agreement with PFD may purchase Class A shares of the Trust at net asset value,
without a sales charge, to the extent that the purchase price is paid out of
proceeds from one or more redemptions by the investor of shares of certain
other mutual funds. In order for a purchase to qualify for this privilege, the
investor must document to the broker-dealer that the redemption occurred within
60 days immediately preceding the purchase of Class A shares; that the client
paid a sales charge on the original purchase of the shares redeemed; and that
the mutual fund whose shares were

                                       10
<PAGE>

redeemed also offers net asset value purchases to redeeming shareholders of any
of the Pioneer mutual funds. Further details may be obtained from PFD.

CLASS B SHARES
   
     You may buy Class B shares at the net asset value per share next computed
after receipt of a purchase order without the imposition of an initial sales
charge; however, Class B shares redeemed within three years of purchase will be
subject to a CDSC at the rates shown in the table below. The charge will be
assessed on the amount equal to the lesser of the current market value or the
original purchase cost of the shares being redeemed. No CDSC will be imposed on
increases in account value above the initial purchase price, including shares
derived from the reinvestment of dividends or capital gains distributions.
    

     The amount of the CDSC, if any, will vary depending on the number of years
from the time of purchase until the time of redemption of Class B shares. For
the purpose of determining the number of years from the time of any purchase,
all payments during a quarter will be aggregated and deemed to have been made
on the first day of that quarter. In processing redemptions of Class B shares,
the Trust will first redeem shares not subject to any CDSC, and then shares
held longest during the three-year period. As a result, you will pay the lowest
possible CDSC.

     The CDSC for Class B shares subject to a CDSC upon redemption will be
determined as follows:

           YEAR SINCE              CDSC AS A PERCENTAGE OF DOLLAR
            PURCHASE                   AMOUNT SUBJECT TO CDSC
- -------------------------------   --------------------------------
First .........................                  2.0%
Second ........................                  2.0%
Third .........................                  1.0%
Fourth and thereafter .........                 none

     Proceeds from the CDSC are paid to PFD and are used in whole or in part to
defray PFD's expenses related to providing distribution-related services to the
Trust in connection with the sale of Class B shares, including the payment of
compensation to broker-dealers.

   
     Class B shares will automatically convert into Class A shares at the end
of the calendar quarter that is five years after the purchase date, except as
noted below. Class B shares acquired by exchange from Class B shares of another
Pioneer mutual fund will convert into Class A shares based on the date of the
initial purchase and the applicable CDSC. Class B shares acquired through
reinvestment of distributions will convert into Class A shares based on the
date of the initial purchase to which such shares relate. For this purpose,
Class B shares acquired through reinvestment of distributions will be
attributed to particular purchases of Class B shares in accordance with such
procedures as the Trustees may determine from time to time. The conversion of
Class B shares to Class A shares is subject to the continuing availability of a
ruling from the Internal Revenue Service (the "IRS"), which the Trust has
obtained, or an opinion of counsel that such conversions will not constitute
taxable events for federal tax purposes. There can be no assurance that such
ruling or opinion will continue to be in effect at the time any particular
conversion would normally occur. The conversion of Class B shares to Class A
shares will not occur if such ruling or opinion is no longer available and,
therefore, Class B shares would continue to be subject to higher expenses than
Class A shares for an indeterminate period.
    

     WAIVER OR REDUCTION OF CONTINGENT DEFERRED SALES CHARGE. The CDSC on Class
B shares and on any Class A shares subject to a CDSC may be waived or reduced
for non-retirement accounts if: (a) the redemption results from the death of all
registered owners of an account (in the case of UGMAs, UTMAs and trust accounts,
waiver applies upon the death of all beneficial owners) or a total and permanent
disability (as defined in Section 72 of the Code) of all registered owners
occurring after the purchase of the shares being redeemed or (b) the redemption
is made in connection with limited automatic redemptions as set forth in
"Systematic Withdrawal Plans" (limited in any year to 10% of the value of the
account in the Trust at the time the withdrawal plan is established).

   
     The CDSC on Class B shares and on any Class A shares subject to a CDSC may
be waived or reduced for retirement plan accounts if: (a) the redemption
results from the death or a total and permanent disability (as defined in
Section 72 of the Code) occurring after the purchase of the shares being
redeemed of a shareholder or participant in an employer-sponsored retirement
plan; (b) the distribution is to a participant in an IRA, 403(b) or
employer-sponsored retirement plan, is part of a series of substantially equal
payments made over the life expectancy of the participant or the joint life
expectancy of the participant and his or her beneficiary or as scheduled
periodic payments to a participant (limited in any year to 10% of the value of
the participant's account at the time the distribution amount is established; a
required minimum distribution due to the participant's attainment of age 70-1/2
may exceed the 10% limit only if the distribution amount is based on plan
assets held in Pioneer mutual funds); (c) the distribution is from a 401(a) or
401(k) retirement plan and is a return of excess employee deferrals or employee
contributions or a qualifying hardship distribution as defined by the Code or
results from a termination of employment (limited with respect to a termination
to 10% per year of the value of the plan's assets in the Trust as of the later
of the prior December 31 or the date the account was established unless the
plan's assets are being rolled over to or reinvested in the same class of
shares of a Pioneer mutual fund subject to the CDSC of the shares originally
held); (d) the distribution is from an IRA, 403(b) or employer-sponsored
retirement plan and is to be rolled over to or reinvested in the same class of
shares in a Pioneer mutual fund and which will be subject to the applicable
CDSC upon redemption; (e) the distribution is in the form of a loan to a
participant in a plan which permits loans (each repayment of the loan will
constitute a new sale which will be subject to the applicable CDSC upon
redemption); or (f) the distribution is from a qualified defined contribution
plan and represents a participant's directed transfer (provided that this
privilege has been preauthorized through a prior agreement with PFD regarding
participant directed transfers).
    

     The CDSC on any shares subject to a CDSC may be waived or reduced for
either non-retirement or retirement plan accounts if the redemption is made
pursuant to the Trust's right to liquidate or involuntarily redeem shares in a
share-

                                       11
<PAGE>

holder's account. The CDSC on any shares subject to a CDSC will not be
applicable if the selling broker-dealer elects, with PFD's approval, to waive
receipt of the commission normally paid at the time of the sale.

   
     BROKER-DEALERS. An order for either Class of Trust shares received by a
broker-dealer prior to the close of regular trading on the Exchange is
confirmed at the price appropriate for that Class as determined at the close of
regular trading on the Exchange on the day the order is received, provided the
order is received by PFD prior to PFD's close of business (usually, 5:30 p.m.
Eastern time). It is the responsibility of broker-dealers to transmit orders so
that they will be received by PFD prior to its close of business. PFD or its
affiliates may provide additional compensation to certain dealers or such
dealers' affiliates based on certain objective criteria established from time
to time by PFD. All such payments are made out of PFD's or the affiliate's own
assets. These payments will not change the price an investor will pay for
shares or the amount that the Trust will receive from such sale.
    

     GENERAL. The Trust reserves the right in its sole discretion to withdraw
all or any part of the offering of shares when, in the judgment of the Trust's
management, such withdrawal is in the best interest of the Trust. An order to
purchase shares is not binding on, and may be rejected by, PFD until it has
been confirmed in writing by PFD and payment has been received.

VIII. HOW TO SELL TRUST SHARES

     You can arrange to sell (redeem) Trust shares on any day the Exchange is
open by selling either some or all of your shares to the Trust.

   
     YOU MAY SELL YOUR SHARES EITHER THROUGH YOUR BROKER-DEALER OR DIRECTLY TO
THE TRUST. PLEASE NOTE THE FOLLOWING:
    

   [bullet] If you are selling shares from a retirement account, other than an
            IRA, you must make your request in writing (except for exchanges to
            other Pioneer mutual funds which can be requested by phone or in
            writing). Call 1-800-622-0176 for more information.

   
   [bullet] If you are selling shares from a non-retirement account or IRA, you
            may use any of the methods described below.

     Your shares will be sold at the share price next calculated after your
order is received in good order less any applicable CDSC. Sale proceeds
generally will be sent to you by check, bank wire, or electronic funds transfer
normally within seven days after your order is received in good order. The
Trust reserves the right to withhold payment of the sale proceeds until checks
received by the Trust in payment for the shares being sold have cleared, which
may take up to 15 calendar days from the purchase date.

     IN WRITING. You may sell your shares by delivering a written request,
signed by all registered owners, in good order to PSC; however, you must use a
written request, including a signature guarantee, to sell your shares if any of
the following applies:

   [bullet] you wish to sell over $100,000 worth of shares,
    
   [bullet] your account registration or address has changed within the last 30
            days,

   [bullet] the check is not being mailed to the address on your account
            (address of record),

   [bullet] the check is not being made out to the account owners, or

   [bullet] the sale proceeds are being transferred to a Pioneer mutual fund
            account with a different registration.

     Your request should include your name, the Trust's name, your fund account
number, the Class of shares to be redeemed, the dollar amount or number of
shares to be redeemed, and any other applicable requirements as described
below. Unless instructed otherwise, PSC will send the proceeds of the sale to
the address of record. Fiduciaries and corporations are required to submit
additional documents. For more information, contact PSC at 1-800-225-6292.

     Written requests will not be processed until they are received in good
order by PSC. Good order means that there are no outstanding claims or requests
to hold redemptions on the account, any certificates are endorsed by the record
owner(s) exactly as the shares are registered and the signature(s) are
guaranteed by an eligible guarantor. You should be able to obtain a signature
guarantee from a bank, broker, dealer, credit union (if authorized under state
law), securities exchange or association, clearing agency or savings
association. A notary public cannot provide a signature guarantee. Signature
guarantees are not accepted by facsimile ("fax"). For additional information
about the necessary documentation for redemption by mail, please contact PSC at
1-800-225-6292.

   
     BY TELEPHONE OR BY FAX.  Your account is automatically authorized to have
the telephone redemption privilege unless you indicate otherwise on your
Account Application or by writing to PSC. Proper account identification will be
required for each telephone redemption. The telephone redemption option is not
available to retirement plan accounts, except IRAs. A maximum of $100,000 per
account per day may be redeemed by telephone or fax and the proceeds may be
received by check or by bank wire or electronic funds tranfer. To receive the
proceeds by check: the check must be made payable exactly as the account is
registered and the check must be sent to the address of record which must not
have changed in the last 30 days. To receive the proceeds by bank wire or by
electronic funds transfer: the proceeds must be sent to your bank wire address
of record which must have been properly predesignated either on your Account
Application or on an Account Options Form and which must not have changed in
the last 30 days. To redeem by fax, send your redemption request to
1-800-225-4240. You may always elect to deliver redemption instructions to PSC
by mail. See "Telephone Transactions" below. Telephone and fax redemptions will
be priced as described above. YOU ARE STRONGLY URGED TO CONSULT WITH YOUR
FINANCIAL REPRESENTATIVE PRIOR TO REQUESTING A TELEPHONE REDEMPTION.
    

     BY CHECK. IF REQUESTED BY YOU, THE TRUST WILL ESTABLISH A CHECKING ACCOUNT
FOR YOU WITH THE FIRST NATIONAL BANK OF OMAHA (THE "BANK"). CHECKS MAY BE DRAWN
FOR NOT LESS THAN $500 NOR MORE THAN $250,000. When a check is presented to the
Bank for payment, it will cause the Trust to redeem, at the net asset value
next determined after presentation, a sufficient number of your shares to cover
the check.

                                       12
<PAGE>

You will receive the daily dividends declared on your shares until the day the
check clears. Please allow 1 to 2 weeks for receipt of personalized checks.

     The checking account will be subject to the Bank's rules and regulations
governing checking accounts. If there is an insufficient number of shares in
your account when a check is presented to the Bank for payment, the check will
be returned.

     Since the aggregate value of a shareholder's account in the Trust changes
each day, you should not attempt to withdraw the full amount in your account by
using a check. The checkwriting privilege is generally not available for
retirement plan accounts or accounts subject to backup withholding (see
"Retirement Plans" below).

     SELLING SHARES THROUGH YOUR BROKER-DEALER. The Trust has authorized PFD to
act as its agent in the repurchase of shares of the Trust from qualified
broker-dealers and reserves the right to terminate this procedure at any time.
Your broker-dealer must receive your request before the close of business on
the Exchange and transmit it to PFD before PFD's close of business to receive
that day's redemption price. Your broker-dealer is responsible for providing
all necessary documentation to PFD and may charge you for its services.

     SMALL ACCOUNTS. The minimum account value is $500. If you hold shares of
the Trust in an account with a net asset value of less than the minimum
required amount due to redemptions or exchanges, the Trust may redeem the
shares held in this account at net asset value if you have not increased the
net asset value of the account to at least the minimum required amount within
six months of notice by the Trust to you of the Trust's intention to redeem the
shares.

   
     CDSC ON CLASS A SHARES. Purchases of Class A shares of $1 million or more,
or by participants in a Group Plan which were not subject to an initial sales
charge, may be subject to a CDSC upon redemption. A CDSC is payable to PFD on
these investments in the event of a share redemption within 12 months following
the share purchase, at the rate of 0.50% of the lesser of the value of the
shares redeemed (exclusive of reinvested dividend and capital gain
distributions) or the total cost of such shares. Shares subject to the CDSC
which are exchanged into another Pioneer mutual fund will continue to be
subject to the CDSC of the shares originally held until the original 12-month
period expires. However, no CDSC is payable upon redemption with respect to
Class A shares purchased by 401(a) or 401(k) retirement plans with 1,000 or
more eligible participants or with at least $10 million in plan assets.
    

     GENERAL. Redemptions may be suspended or payment postponed during any
period in which any of the following conditions exist: the Exchange is closed
or trading on the Exchange is restricted; an emergency exists as a result of
which disposal by the Trust of securities owned by it is not reasonably
practicable or it is not reasonably practicable for the Trust to fairly
determine the value of the net assets of its portfolio; or the SEC, by order,
so permits.

     Redemptions and repurchases are taxable transactions to shareholders. The
net asset value per share received upon redemption or repurchase may be more or
less than the cost of shares to an investor, depending on the market value of
the portfolio at the time of redemption or repurchase.

IX. HOW TO EXCHANGE TRUST SHARES

     YOU MAY NOT EXCHANGE CLASS A SHARES OF THE TRUST, EXCEPT AS NOTED BELOW,
FOR SHARES OF ANY OTHER PIONEER MUTUAL FUNDS FOR A PERIOD OF 12 MONTHS
FOLLOWING THEIR PURCHASE; following this 12-month period, you may exchange your
Class A shares of the Trust at net asset value, without a sales charge, for
shares of the same Class of any other publicly available Pioneer mutual fund.
Accounts established under a Group Plan and Class A shares purchased at net
asset value without a sales charge are exempt from the 12-month holding period
requirement. Accounts established to utilize Automatic Exchange (see below) for
scheduled periods of 12 months or longer meet this minimum holding period. Not
all Pioneer mutual funds offer more than one Class of shares.

   
     WRITTEN EXCHANGES. You may exchange your shares by sending a letter of
instruction to PSC. Your letter should include your name, the name of the
Pioneer mutual fund out of which you wish to exchange and the name of the
Pioneer mutual fund into which you wish to exchange, your fund account
number(s), the Class of shares to be exchanged and the dollar amount or number
of shares to be exchanged. Written exchange requests must be signed by all
record owner(s) exactly as the shares are registered.

     TELEPHONE EXCHANGES.  Your account is automatically authorized to have the
telephone exchange privilege unless you indicate otherwise on your Account
Application or by writing to PSC. Proper account identification will be
required for each telephone exchange. Telephone exchanges may not exceed
$500,000 per account per day. Each telephone exchange request, whether by voice
or by FactFoneSM, will be recorded. YOU ARE STRONGLY URGED TO CONSULT WITH YOUR
FINANCIAL REPRESENTATIVE PRIOR TO REQUESTING A TELEPHONE EXCHANGE. See
"Telephone Transactions" below.
    

     AUTOMATIC EXCHANGES. You may automatically exchange shares from one
Pioneer mutual fund account for shares of the same Class in another Pioneer
mutual fund account on a monthly or quarterly basis. The accounts must have
identical registrations and the originating account must have a minimum balance
of $5,000. The exchange will be effective on the day of the month designated on
your Account Application or Account Options Form.

     GENERAL. Exchanges must be at least $1,000. A new Pioneer mutual fund
account opened through an exchange must have a registration identical to that
on the original account.

     Shares which would normally be subject to a CDSC upon redemption will not
be charged the applicable CDSC at the time of an exchange. Shares acquired in
an exchange will be subject to the CDSC of the shares originally held. For
purposes of determining the amount of any applicable CDSC, the length of time
you have owned shares acquired by exchange will be measured from the date you
acquired the original shares and will not be affected by any subsequent
exchange.

   
     Exchange requests received by PSC before 4:00 p.m. Eastern time will be
effective on that day if the requirements
    

                                       13
<PAGE>

   
above have been met, otherwise, they will be effective on the next business
day. PSC will process exchanges only after receiving an exchange request in
good order. There are currently no fees or sales charges imposed at the time of
an exchange. An exchange of shares may be made only in states where legally
permitted. For federal and (generally) state income tax purposes, an exchange
is considered to be a sale of the shares of the Trust exchanged and a purchase
of shares in another Pioneer mutual fund. Therefore, an exchange could result
in a gain or loss on the shares sold, depending on the tax basis of these
shares and the timing of the transaction, and special tax rules may apply.
    

     You should consider the differences in objectives and policies of the
Pioneer mutual funds, as described in each fund's current prospectus, before
making any exchange.

     For the protection of the Trust's performance and shareholders, the Trust
and PFD reserve the right to refuse any exchange request or restrict, at any
time without notice, the number and/or frequency of exchanges to prevent abuses
of the exchange privilege. Such abuses may arise from frequent trading in
response to short-term market fluctuations, a pattern of trading by an
individual or group that appears to be an attempt to "time the market," or any
other exchange request which, in the view of management, will have a
detrimental effect on the Trust's portfolio management strategy or its
operations. In addition, the Trust and PFD reserve the right to charge a fee
for exchanges or to modify, limit, suspend or discontinue the exchange
privilege with notice to shareholders as required by law.


X. DISTRIBUTION PLANS

   
     The Trust has adopted a Plan of Distribution for each class of shares
except Class Y shares (the "Class A Plan" and "Class B Plan") in accordance
with Rule 12b-1 under the Investment Company Act of 1940, as amended, pursuant
to which certain distribution and service fees are paid to PFD.

     Pursuant to the Class A Plan, the Trust reimburses PFD for its actual
expenditures to finance any activity primarily intended to result in the sale
of Class A shares or to provide services to holders of Class A shares, provided
the categories of expenses for which reimbursement is made are approved by the
Trust's Board of Trustees. As of the date of this Prospectus, the Board of
Trustees has approved the following categories of expenses for Class A shares
of the Trust: (i) a service fee to be paid to qualified broker-dealers in an
amount not to exceed 0.25% per annum of the Trust's daily net assets
attributable to Class A shares; (ii) reimbursement to PFD for its expenditures
for broker-dealer commissions and employee compensation on certain sales of the
Trust's Class A shares with no initial sales charge (see "How to Buy Trust
Shares"); and (iii) reimbursement to PFD for expenses incurred in providing
services to Class A shareholders and supporting broker-dealers and other
organizations (such as banks and trust companies) in their efforts to provide
such services. Banks are currently prohibited under the Glass-Steagall Act from
providing certain underwriting or distribution services. If a bank was
prohibited from acting in any capacity or providing any of the described
services, management would consider what action, if any, would be appropriate.

     Expenditures of the Trust pursuant to the Class A Plan are accrued daily
and may not exceed 0.25% of the Trust's average daily net assets attributable
to Class A shares. Distribution expenses of PFD are expected to substantially
exceed the distribution fees paid by the Trust in a given year. The Class A
Plan may not be amended to increase materially the annual percentage limitation
of average net assets which may be spent for the services described therein
without approval of the Class A shareholders of the Trust. The Class A Plan
does not provide for the carryover of reimbursable expenses beyond 12 months
from the time the Trust is first invoiced for an expense. The limited carryover
provision in the Class A Plan may result in an expense invoiced to the Trust in
one fiscal year being paid in the subsequent fiscal year and thus being treated
for purposes of calculating the maximum expenditures of the Trust as having
been incurred in the subsequent fiscal year. In the event of termination or
non-continuance of the Class A Plan, the Trust has 12 months to reimburse any
expense which it incurs prior to such termination or non-continuance, provided
that payments by the Trust during such 12-month period shall not exceed 0.25%
of the Trust's average daily net assets during such period. For the fiscal year
ended December 31, 1997, there was an allowable carryover of distribution
expenses reimbursable to PFD of $30,445 (approximately 0.07% of the net assets
attributable to the Class A shares of the Trust).

     The Class B Plan provides that the Trust will pay a distribution fee at
the annual rate of 0.75% of the Trust's average daily net assets attributable
to Class B shares and will pay PFD a service fee at the annual rate of 0.25% of
the Trust's average daily net assets attributable to Class B shares. The
distribution fee is intended to compensate PFD for its Class B distribution
services to the Trust. The service fee is intended to be additional
compensation for personal services and/or account maintenance services with
respect to Class B shares. PFD also receives the proceeds of any CDSC imposed
on the redemption of Class B shares.

     Commissions of 2%, equal to 1.75% of the amount invested and a first
year's service fee equal to 0.25% of the amount invested in Class B shares, are
paid to broker-dealers who have sales agreements with PFD. PFD may advance to
dealers the first year service fee at a rate up to 0.25% of the purchase price
of such shares and, as compensation therefore, PFD may retain the service fee
paid by the Trust with respect to such shares for the first year after
purchase. Dealers will become eligible for additional service fees with respect
to such shares commencing in the 13th month following the purchase.

     When a broker-dealer sells Class B shares and elects, with PFD's approval,
to waive its right to receive the commission normally paid at the time of the
sale, PFD may cause all or a portion of the distribution fees described above
to be paid to the broker-dealer.
    

     Dealers may from time to time be required to meet certain criteria in
order to receive service fees. PFD or its affiliates are entitled to retain all
service fees payable under the Class

                                       14
<PAGE>

B Plan for which there is no dealer of record or for which qualification
standards have not been met as partial consideration for personal services
and/or account maintenance services performed by PFD or its affiliates for
shareholder accounts.

XI. DIVIDENDS, DISTRIBUTIONS AND TAXATION

   
     The Trust has elected to be treated, has qualified and intends to qualify
each year as a "regulated investment company" under Subchapter M of the Code,
so that it will not pay federal income tax on income and capital gains
distributed to shareholders as required under the Code. Under the Code, the
Trust will be subject to a nondeductible 4% federal excise tax on a portion of
its undistributed ordinary income and capital gains if it fails to meet certain
distribution requirements with respect to each calendar year. The Trust intends
to make distributions in a timely manner and accordingly does not expect to be
subject to the excise tax.
    

     Each business day the Trust declares a dividend consisting of
substantially all of the Trust's net investment income (which includes earned
interest and certain other income, less expenses). SHAREHOLDERS BEGIN EARNING
DIVIDENDS ON THE FIRST BUSINESS DAY FOLLOWING RECEIPT OF PAYMENT FOR PURCHASED
SHARES. Shares continue to earn dividends up to and including the date of
redemption. Dividends are normally paid on the last business day of the month
or shortly thereafter. Monthly distributions consist of net investment income
and may also include a portion of any market discount, income from securities
lending, certain net foreign exchange gains, and net short-term capital gains
realized by the Trust. The Trust's policy is to make distributions from net
long-term capital gains, if any, annually, generally in December. Dividends
from income and/or capital gains may also be paid at such other times as may be
necessary for the Trust to avoid federal income or excise tax. Generally,
dividends from the Trust's net investment income, market discount income,
income from securities lending, certain net foreign exchange gains, and net
short-term capital gains are taxable under the Code as ordinary income, and
dividends from the Trust's net long-term capital gains are taxable as long-term
capital gains.

   
     The Trust's distributions of long-term capital gains to individuals or
other noncorporate taxpayers are subject to different maximum tax rates (which
will be indicated in the annual tax information the Trust provides to
shareholders), depending generally upon the sources of, and the Trust's holding
periods for the assets that produce, the gains.

     UNLESS SHAREHOLDERS SPECIFY OTHERWISE, ALL DISTRIBUTIONS WILL BE
AUTOMATICALLY REINVESTED IN ADDITIONAL FULL AND FRACTIONAL SHARES OF THE TRUST.
FOR FEDERAL INCOME TAX PURPOSES, ALL DIVIDENDS ARE TAXABLE AS DESCRIBED ABOVE
WHETHER A SHAREHOLDER TAKES THEM IN CASH OR REINVESTS THEM IN ADDITIONAL SHARES
OF THE TRUST. Information as to the federal tax status of dividends and
distributions will be provided to shareholders annually. For further
information on the distribution options available to shareholders, see
"Distribution Options" and "Directed Dividends" below.
    

     The Trust's dividends and distributions generally will not qualify for any
dividends-received deduction available to corporate shareholders.

     The Trust may be subject to foreign withholding taxes or other foreign
taxes on income (possibly including capital gains) from certain of its foreign
investments, which will reduce the yield on or return from those investments.
If, as anticipated, the Trust does not qualify to pass such taxes through to
its shareholders, they will neither treat such taxes as additional income nor
be entitled to any associated foreign tax credits or deductions.

     Dividends and other distributions and the proceeds of redemptions,
exchanges or repurchases of Trust shares paid to individuals and other
non-exempt payees will be subject to 31% backup withholding of federal income
tax if the Trust is not provided with the shareholder's correct taxpayer
identification number and certification that the number is correct and that the
shareholder is not subject to backup withholding or the Trust receives notice
from the IRS or a broker that such withholding applies. Please refer to the
Account Application for additional information.

   
     The description above relates only to U.S. federal income tax consequences
for shareholders who are U.S. persons, i.e., U.S. citizens or residents or U.S.
corporations, partnerships, trusts or estates, and who are subject to U.S.
federal income tax. Non-U.S. shareholders and tax-exempt shareholders are
subject to tax treatment that is not described above. A state income (and
possibly local income and/or intangible property) tax exemption is generally
available to the extent the Trust's distributions are derived from interest on
(or, in the case of intangible property taxes, the value of its assets is
attributable to) certain U.S. government obligations, provided in some states
that certain concentration, designation, reporting or other requirements are
satisfied. The Trust will not attempt to and may not satisfy all such
requirements in all states. Shareholders should consult their own tax advisors
regarding state, local and other applicable tax laws, including the effect of
recent federal tax legislation, in their particular circumstances.
    


XII. SHAREHOLDER SERVICES

   
     PSC is the shareholder services and transfer agent for shares of the
Trust. PSC, a Massachusetts corporation, is a wholly owned subsidiary of PGI.
PSC's offices are located at 60 State Street, Boston, Massachusetts 02109, and
inquiries to PSC should be mailed to Shareholder Services, Pioneering Services
Corporation, P.O. Box 9014, Boston, Massachusetts 02205-9014. Brown Brothers
Harriman & Co. ("the Custodian") serves as the custodian of the Trust's
portfolio securities and other assets. The principal business address of the
mutual funds division of the Custodian is 40 Water Street, Boston,
Massachusetts 02109.
    

ACCOUNT AND CONFIRMATION STATEMENTS
   
     PSC maintains an account for each shareholder and all transactions of the
shareholder are recorded in this account. Confirmation statements showing the
details of transactions are sent to shareholders as transactions occur, except
Automatic Investment Plan transactions which are confirmed quar-
    

                                       15
<PAGE>

   
terly. The Pioneer Combined Account Statement, mailed quarterly, is available
to shareholders who have more than one Pioneer mutual fund account.

     Shareholders whose shares are held in the name of an investment
broker-dealer or other party will not normally have an account with the Trust
and might not be able to utilize some of the services available to shareholders
of record. Examples of services that might not be available are purchases,
exchanges or redemptions of shares by mail or telephone, automatic reinvestment
of dividends and capital gains distributions, withdrawal plans, LOIs, rights of
accumulation and newsletters.
    

ADDITIONAL INVESTMENTS

     You may add to your account by sending a check ($100 minimum for Class A
shares and $500 for Class B shares) to PSC (account number and Class of shares
should be clearly indicated). The bottom portion of a confirmation statement
may be used as a remittance slip to make additional investments.

     Additions to your account, whether by check or through a Pioneer
Investomatic Plan, are invested in full and fractional shares of the Trust at
the applicable offering price in effect as of the close of regular trading on
the Exchange on the day of receipt.

AUTOMATIC INVESTMENT PLANS
   
     You may arrange for regular automatic investments of $50 or more through
government/military allotments, payroll deduction or through a Pioneer
Investomatic Plan. A Pioneer Investomatic Plan provides for a monthly or
quarterly investment by means of a preauthorized electronic funds transfer from
your bank account. Pioneer Investomatic Plan investments are voluntary, and you
may discontinue your plan at any time or change your plan elections for the
dollar amount, frequency or investment date by calling PSC at 1-800-225-6292,
or by sending a written request to Shareholder Services, Pioneering Services
Corporation, P.O. Box 9014, Boston, Massachusetts 02205-9014. A change to your
bank information must be made in writing on an Account Options Form. You should
allow up to five business days for PSC to make changes to an established plan.
PSC acts as agent for the purchaser, the broker-dealer and PFD in maintaining
these plans.
    

FINANCIAL REPORTS AND TAX INFORMATION
   
     As a shareholder, you will receive financial reports at least
semiannually. In January of each year, the Trust will mail you information
about the tax status of dividends and distributions.
    

DISTRIBUTION OPTIONS
   
     Dividends and capital gains distributions, if any, will automatically be
invested in additional shares of the Trust, at the applicable net asset value
per share, unless you indicate another option on the Account Application. Two
other options available are (a) dividends in cash and capital gains
distributions in additional shares; and (b) all dividends and capital gains
distributions in cash. These two options are not available, however, for
retirement plans or for an account with a net asset value of less than $500.
Changes in your distribution options may be made by written request to PSC.

     If you elect to receive either dividends or dividends and capital gains in
cash and a distribution check issued to you is returned by the U.S. Postal
Service as not deliverable or a distribution check remains uncashed for six
months or more, the amount of the check may be reinvested in your account. Such
additional shares will be purchased at the then current net asset value.
Furthermore, the distribution option on the account will automatically be
changed to the reinvestment option until such time as you request a different
option by writing to PSC.
    

DIRECTED DIVIDENDS
   
     You may elect (in writing) to have the dividends paid by one Pioneer
mutual fund account invested in a second Pioneer mutual fund account. The value
of this second account must be at least $1,000 ($500 for Pioneer Fund or
Pioneer II). Invested dividends may be in any amount, and there are no fees or
charges for this service. Retirement plan shareholders may only direct
dividends to accounts with identical registrations.
    

DIRECT DEPOSIT
     If you have elected to take distributions, whether dividends or dividends
and capital gains, in cash, or have established a Systematic Withdrawal Plan,
you may choose to have those cash payments deposited directly into your
savings, checking or NOW bank account. You may establish this service by
completing the appropriate section on the Account Application when opening a
new account or the Account Options Form for an existing account.

VOLUNTARY TAX WITHHOLDING
   
     You may request (in writing) that PSC withhold 28% of the dividends and
capital gains distributions paid from your account (before any reinvestment)
and forward the amount withheld to the IRS as a credit against your federal
income taxes. This option is not available for retirement plan accounts or for
accounts subject to backup withholding.

TELEPHONE TRANSACTIONS

     Your account is automatically authorized to have telephone transaction
privileges unless you indicate otherwise on your Account Application or by
writing to PSC. You may purchase, sell or exchange Trust shares by telephone.
See "How to Buy Trust Shares," "How to Sell Trust Shares" and "How to Exchange
Trust Shares" for more information. For personal assistance, call
1-800-225-6292 between 8:00 a.m. and 9:00 p.m. Eastern time on weekdays.
Computer-assisted transactions may be available to shareholders who have
pre-recorded certain bank information (see "FactFone(SM)"). YOU ARE STRONGLY
URGED TO CONSULT WITH YOUR FINANCIAL REPRESENTATIVE PRIOR TO REQUESTING ANY
TELEPHONE TRANSACTION.

     To confirm that each transaction instruction received by telephone is
genuine, PSC will record each telephone transaction, require the caller to
provide the personal identification number ("PIN") for the account and send you
a written confirmation of each telephone transaction. Different procedures may
apply to accounts that are registered to non-U.S. citizens or that are held in
the name of an institution or in the name of an investment broker-dealer or
other third party. If reasonable procedures, such as those described above, are
not followed, the Trust may
    

                                       16
<PAGE>

   
be liable for any loss due to unauthorized or fraudulent instructions. The
Trust may implement other procedures from time to time. In all other cases,
neither the Trust, PSC nor PFD will be responsible for the authenticity of
instructions received by telephone; therefore, you bear the risk of loss for
unauthorized or fraudulent telephone transactions.
    

     During times of economic turmoil or market volatility or as a result of
severe weather or a natural disaster, it may be difficult to contact the Trust
by telephone to institute a redemption or exchange. You should communicate with
the Trust in writing if you are unable to reach the Trust by telephone.

FACTFONE(SM)
   
     FactFone(SM) is an automated inquiry and telephone transaction system
available to Pioneer shareholders by dialing 1-800-225-4321. FactFone(SM) allows
you to obtain current information on your Pioneer mutual fund accounts and to
inquire about the prices and yields of all publicly available Pioneer mutual
funds. In addition, you may use FactFone(SM) to make computer-assisted telephone
purchases, exchanges and redemptions from your Pioneer mutual fund accounts if
you have activated your PIN. Telephone purchases and redemptions require the
establishment of a bank account of record. YOU ARE STRONGLY URGED TO CONSULT
WITH YOUR FINANCIAL REPRESENTATIVE PRIOR TO REQUESTING ANY TELEPHONE
TRANSACTION. Shareholders whose accounts are registered in the name of a
broker-dealer or other third party may not be able to use FactFone(SM). See "How
to Buy Trust Shares," "How to Exchange Trust Shares," "How to Sell Trust
Shares" and "Telephone Transactions." Call PSC for assistance.
    

RETIREMENT PLANS
   
     Interested persons should contact the Retirement Plans Department of PSC
at 1-800-622-0176 for information relating to tax-deferred retirement plans for
individuals, businesses and tax-exempt organizations. The Account Application
accompanying this Prospectus should not be used to establish such plans.
Separate applications are required.
    

TELECOMMUNICATIONS DEVICE FOR THE DEAF (TDD)

   
     If you have a hearing disability and access to TDD keyboard equipment, you
can call our TDD number toll-free at 1-800-225-1997, weekdays from 8:30 a.m. to
5:30 p.m. Eastern time, to contact our telephone representatives with questions
about your account.
    

SYSTEMATIC WITHDRAWAL PLANS
   
     If your account has a total value of at least $10,000 you may establish a
Systematic Withdrawal Plan ("SWP") providing for fixed payments at regular
intervals. Withdrawals from Class B share accounts are limited to 10% of the
value of the account at the time the SWP is implemented. See "Waiver or
Reduction of Contingent Deferred Sales Charge" for more information.

     Periodic payments of $50 or more will be sent to you, or any person
designated by you, monthly or quarterly, and your periodic redemptions of
shares may be taxable to you. Payments can be made either by check or
electronic transfer to a bank account designated by you. If you direct that
withdrawal payments be paid to another person after you have opened your
account, a signature guarantee must accompany your instructions. Purchases of
Class A shares of the Trust at a time when you have a SWP in effect may result
in the payment of unnecessary sales charges and may, therefore, be
disadvantageous.
    

     You may obtain additional information by calling PSC at 1-800-225-6292 or
by referring to the Trust's Statement of Additional Information.

REINSTATEMENT PRIVILEGE (CLASS A SHARES ONLY)

     If you redeem all or part of your Class A shares of the Trust, you may
reinvest all or part of the redemption proceeds without a sales charge in Class
A shares of the Trust if you send a written request to PSC not more than 90
days after your shares were redeemed. Your redemption proceeds will be
reinvested at the next determined net asset value of the Class A shares of the
Trust in effect immediately after receipt of the written request for
reinstatement. You may realize a gain or loss for federal income tax purposes
as a result of the redemption, and special tax rules may apply if a
reinstatement occurs. In addition, if redemption resulted in a loss and an
investment is made in shares of the Trust within 30 days before or after the
redemption, you may not be able to recognize the loss for federal income tax
purposes. Subject to the provisions outlined under "How to Exchange Trust
Shares" above, you may also reinvest in Class A shares of other Pioneer mutual
funds; in this case you must meet the minimum investment requirements for each
fund you enter.

   
     The 90-day reinstatement period may be extended by PFD for periods of up
to one year for shareholders living in areas that have experienced a natural
disaster, such as a flood, hurricane, tornado or earthquake.
    
                ----------------------------------------------
   
     THE OPTIONS AND SERVICES AVAILABLE TO SHAREHOLDERS, INCLUDING THE TERMS OF
THE EXCHANGE PRIVILEGE AND THE PIONEER INVESTOMATIC PLAN, MAY BE REVISED,
SUSPENDED OR TERMINATED AT ANY TIME BY PFD OR BY THE TRUST. YOU MAY ESTABLISH
THE SERVICES DESCRIBED IN THIS SECTION WHEN YOU OPEN YOUR ACCOUNT. YOU MAY ALSO
ESTABLISH OR REVISE MANY OF THEM ON AN EXISTING ACCOUNT BY COMPLETING AN
ACCOUNT OPTIONS FORM, WHICH YOU MAY OBTAIN BY CALLING 1-800-225-6292.
    

XIII. THE TRUST

   
     The Trust is a diversified open-end management investment company
(commonly referred to as a mutual fund) organized as a Massachusetts business
trust on August 10, 1992. The Trust has authorized an unlimited number of
shares of beneficial interest and the Trustees are authorized to create
additional series of the Trust. The Trust is not required to hold annual
shareholder meetings although special meetings may be called for the purposes
of electing or removing Trustees, changing fundamental investment restrictions
or approving a management contract. The Trustees have the authority, without
further shareholder approval, to classify and reclassify the shares of the
Trust, or any new series of the Trust, into one or more classes. As of the date
of this Prospectus, the Trustees have authorized the issuance of three Classes
of shares, designated Class A, Class B and Class Y. The shares of each Class
represent an
    

                                       17
<PAGE>

interest in the same portfolio of investments of the Trust. Each Class has
equal rights as to voting, redemption, dividends and liquidation, except that
each Class bears different distribution and transfer agent fees and may bear
other expenses properly attributable to the particular Class. Class A and Class
B shareholders have exclusive voting rights with respect to the Rule 12b-1
distribution plans adopted by holders of those shares in connection with the
distribution of shares.

   
     When issued and paid for in accordance with the terms of the Prospectus
and Statement of Additional Information, shares of the Trust are fully paid and
non-assessable. Shares will remain on deposit with the Trust's transfer agent
and certificates will not normally be issued. The Trust reserves the right to
charge a fee for the issuance of Class A share certificates; certificates will
not be issued for Class B shares.
    

XIV. INVESTMENT RESULTS

     The average annual total return (for a designated period of time) on an
investment in the Trust may be included in advertisements, and furnished to
existing or prospective shareholders. The average annual total return for each
Class is computed in accordance with the SEC's standardized formula. The
calculation for all Classes assumes the reinvestment of all dividends and
distributions at net asset value and does not reflect the impact of federal or
state income taxes. In addition, for Class A shares the calculation assumes the
deduction of the maximum sales charge of 2.50%; for Class B shares the
calculation reflects the deduction of any applicable CDSC. The periods
illustrated would normally include one, five and ten years (or since the
commencement of the public offering of the shares of a Class, if shorter)
through the most recent calendar quarter.

     One or more additional measures and assumptions, including but not limited
to historical total returns; distribution returns; results of actual or
hypothetical investments; changes in dividends, distributions or share values;
or any graphic illustration of such data may also be used. These data may cover
any period of the Trust's existence and may or may not include the impact of
sales charges, taxes or other factors.

   
     Other investments or savings vehicles and/or unmanaged market indices,
indicators of economic activity or averages of mutual funds results may be
cited or compared with the investment results of the Trust. Rankings or
listings by magazines, newspapers or independent statistical or rating
services, such as Lipper Analytical Services, Inc., may also be referenced. The
Trust may also include securities industry or comparative performance
information in advertising or materials marketing the Trust's shares. Such
performance information may include rankings or listings by magazines,
newspapers or independent statistical or ratings services, such as Lipper
Analytical Services, Inc. or Ibbotson Associates.
    

     The Trust's investment results will vary from time to time depending on
market conditions, the composition of the Trust's portfolio and operating
expenses of the Trust. All quoted investment results are historical and should
not be considered representative of what an investment in the Trust may earn in
any future period. For further information about the calculation methods and
uses of the Trust's investment results, see the Statement of Additional
Information.

                                       18
<PAGE>

                          THE PIONEER FAMILY OF MUTUAL FUNDS

                          GROWTH FUNDS
                          GLOBAL/INTERNATIONAL
                           
                             Pioneer Emerging Markets Fund
                             Pioneer Europe Fund
                             Pioneer Gold Shares
                             Pioneer India Fund
                             Pioneer International Growth Fund
                             Pioneer World Equity Fund

                          UNITED STATES
                           
                             Pioneer Capital Growth Fund
                             Pioneer Growth Shares
   
                             Pioneer Micro-Cap Fund*
    
                             Pioneer Mid-Cap Fund
                             Pioneer Small Company Fund

   
                          GROWTH AND INCOME FUNDS
    
                             Pioneer Balanced Fund
                             Pioneer Equity-Income Fund
                             Pioneer Fund
                             Pioneer Real Estate Shares
                             Pioneer II

                          INCOME FUNDS
                          TAXABLE
                           
                             Pioneer America Income Trust
                             Pioneer Bond Fund
                             Pioneer Short-Term Income Trust*

                          TAX EXEMPT
                           
                             Pioneer Intermediate Tax-Free Fund**
                             Pioneer Tax-Free Income Fund**

                          MONEY MARKET FUND
                           
                             Pioneer Cash Reserves Fund

                            *Offers Class A and B Shares only
                           **Not suitable for retirement accounts

                                       19
<PAGE>
                                                                   [logo]PIONEER
PIONEER 
SHORT-TERM
INCOME TRUST

60 STATE STREET
BOSTON, MASSACHUSETTS 02109

OFFICERS
JOHN F. COGAN, JR., CHAIRMAN AND PRESIDENT
DAVID D. TRIPPLE, EXECUTIVE VICE PRESIDENT
RICHARD A. SCHLANGER, VICE PRESIDENT
WILLIAM H. KEOUGH, TREASURER
JOSEPH P. BARRI, SECRETARY

INVESTMENT ADVISER
PIONEERING MANAGEMENT CORPORATION

PRINCIPAL UNDERWRITER
PIONEER FUNDS DISTRIBUTOR, INC.

CUSTODIAN
BROWN BROTHERS HARRIMAN & CO.

INDEPENDENT PUBLIC ACCOUNTANTS
ARTHUR ANDERSEN LLP

LEGAL COUNSEL
HALE AND DORR LLP

SHAREHOLDER SERVICES AND TRANSFER AGENT
PIONEERING SERVICES CORPORATION
60 State Street
Boston, Massachusetts 02109
Telephone: 1-800-225-6292

SERVICE INFORMATION
If you would like information on the following, please call:

   
Existing and new accounts, prospectuses,
    
 applications, service forms and
 telephone transactions........................................ 1-800-225-6292
FactFone(SM)
   
 Automated fund yields and prices,
 account information and computer transactions ................ 1-800-225-4321
    
Retirement plans............................................... 1-800-622-0176
   
Toll-free fax ................................................. 1-800-225-4240
Telecommunications Device for the Deaf (TDD) .................. 1-800-225-1997
Visit our web site:...................................... www.pioneerfunds.com





0398-4968
    
(C) Pioneer Funds Distributor, Inc.


<PAGE>


                         PIONEER SHORT-TERM INCOME TRUST
                                 60 State Street
                           Boston, Massachusetts 02109

                       STATEMENT OF ADDITIONAL INFORMATION

                           CLASS A AND CLASS B SHARES

                                         
                                 MARCH 30, 1998


      This Statement of Additional Information is not a Prospectus, but should
be read in conjunction with the Prospectus, dated March 30, 1998, as amended
and/or supplemented from time to time (the "Prospectus"). A copy of the
Prospectus can be obtained free of charge by calling Shareholder Services at
1-800-225-6292 or by written request to Pioneer Short-Term Income Trust (the
"Trust") at 60 State Street, Boston, Massachusetts 02109. The most recent Annual
Report to Shareholders is attached to this Statement of Additional Information
and is hereby incorporated in this Statement of Additional Information by
reference.    

                                TABLE OF CONTENTS
                                                                     PAGE
   
1.       Investment Policies and Restrictions......................   2
2.       Management of the Trust...................................   7
3.       Investment Adviser........................................  11
4.       Underwriting Agreement and Distribution Plans.............  12
5.       Shareholder Servicing/Transfer Agent......................  14
6.       Custodian.................................................  14
7.       Principal Underwriter.....................................  14
8.       Independent Public Accountants............................  15
9.       Portfolio Transactions....................................  15
10.      Tax Status................................................  17
11.      Description of Shares.....................................  20
12.      Certain Liabilities.......................................  21
13.      Determination of Net Asset Value..........................  21
14.      Systematic Withdrawal Plan................................  22
15.      Letter of Intent..........................................  23
16.      Investment Results........................................  23
17.      Financial Statements......................................  27
         Appendix A - Description of Short-Term Debt
         and Corporate Bond Ratings................................  28
         Appendix B - Performance Statistics.......................  33
         Appendix C - Other Pioneer Information....................  45



      THIS STATEMENT OF ADDITIONAL INFORMATION IS NOT A PROSPECTUS AND IS
     AUTHORIZED FOR DISTRIBUTION TO PROSPECTIVE INVESTORS ONLY IF PRECEDED
                   OR ACCOMPANIED BY AN EFFECTIVE PROSPECTUS.    


                                       1


<PAGE>


1.       INVESTMENT POLICIES AND RESTRICTIONS

   
 The Prospectus identifies the investment objective and the principal investment
policies of the Trust. Additional investment policies of the Trust are set forth
below. This Statement of Additional Information should be read in conjunction
with the Prospectus. Capitalized terms not otherwise defined herein have the
meaning given to them in the Prospectus. The Trust's investment adviser is
Pioneering Management Company ("PMC").    

ASSET-BACKED SECURITIES

   
      The Trust may invest in asset-backed securities, which are securities that
represent a participation in, or are secured by and payable from, a stream of
payments generated by particular assets, most often a pool or pools of similar
assets (e.g., trade receivables). The credit quality of these securities depends
primarily upon the quality of the underlying assets and the level of credit
support and/or enhancement provided.    

   The underlying assets (e.g., loans) are subject to prepayments which shorten
the securities' weighted average maturity and may lower their return. If the
credit support or enhancement is exhausted, losses or delays in payment may
result if the required payments of principal and interest are not made. The
value of these securities also may change because of changes in the market's
perception of the creditworthiness of the servicing agent for the pool, the
originator of the pool, or the financial institution or trust providing the
credit support or enhancement.

MORTGAGE-BACKED SECURITIES

   
    The Trust may invest in mortgage-backed securities issued or guaranteed by
the U.S. Government, its agencies or instrumentalities and private entities.
Some of these securities, such as GNMA certificates, are backed by the full
faith and credit of the U.S. Treasury while others, such as Freddie Mac
certificates, are not.    

  Mortgage-backed securities are securities representing interests in a pool of
mortgages. Principal and interest payments made on the mortgages in the
underlying mortgage pool are passed through to the Trust. Unscheduled
prepayments of principal shorten the securities' weighted average life and may
lower their total return. The value of these securities also may change because
of changes in the market's perception of the creditworthiness of the federal
agency that issued them. In addition, the mortgage securities market in general
may be adversely affected by changes in governmental regulations or tax
policies.

WHEN-ISSUED SECURITIES

    The Trust may from time to time purchase securities on a "when-issued"
basis, provided that at any time not more than 5% of the Trust's net assets may
consist of "when-issued" securities. The price of such securities, which may be
expressed in yield terms, is fixed at the time the commitment to purchase is
made, but delivery and payment for the when-issued securities take place at a
later date. It is possible that the value of such securities will increase or
decrease prior to the Trust's actual receipt of them. Normally, the settlement
date occurs within one month of the purchase.


                                       2


<PAGE>


SECURITIES OF FOREIGN ISSUERS

   The Trust may invest in securities issued by foreign issuers and securities
of foreign branches of U.S. banks, such as negotiable certificates of deposit.
Such investments are subject to the Trust's quality and maturity standards (set
forth in the Prospectus).

FORWARD FOREIGN CURRENCY TRANSACTIONS

   
      The foreign currency transactions of the Trust may be conducted on a spot,
i.e., cash, basis at the spot rate for purchasing or selling currency prevailing
in the foreign exchange market. The Trust also has authority to enter into
forward foreign currency exchange contracts involving currencies of the
different countries in which it will invest as a hedge against possible
variations in the foreign exchange rate between these currencies and the U.S.
dollar. This is accomplished through contractual agreements to purchase or sell
a specified currency at a specified future date and price set at the time of the
contract. The Trust's transactions in forward foreign currency contracts will be
limited to hedging either specific transactions or portfolio positions.
Transaction hedging is the purchase or sale of forward foreign currency
contracts with respect to specific receivables or payables of the Trust accruing
in connection with the purchase and sale of its portfolio securities denominated
in foreign currencies. Portfolio hedging is the use of forward foreign currency
contracts to offset portfolio security positions denominated or quoted in such
foreign currencies. There is no guarantee that the Trust will be engaged in
hedging activities when adverse exchange rate movements occur. The Trust will
not attempt to hedge all of its foreign portfolio positions and will enter into
such transactions only to the extent, if any, deemed appropriate by PMC. The
Trust will not enter into speculative forward foreign currency contracts.

    If the Trust enters into a forward contract to purchase foreign currency,
its custodian bank will segregate cash or high grade liquid debt securities in a
separate account of the Trust in an amount equal to the value of the Trust's
total assets committed to the consummation of such forward contract. Those
assets will be valued at market daily, and if the value of the assets in the
separate account declines, additional cash or securities will be placed in the
account so that the value of the account will equal the amount of the Trust's
commitment with respect to such contracts.    

  Hedging against a decline in the value of a currency does not eliminate
fluctuations in the prices of portfolio securities or prevent losses if the
prices of such securities decline. Such transactions also limit the opportunity
for gain if the value of the hedged currency should rise. Moreover, it may not
be possible for the Trust to hedge against a devaluation that is so generally
anticipated that the Trust is not able to contract to sell the currency at a
price above the devaluation level it anticipates.

    The cost to the Trust of engaging in foreign currency transactions varies
with such factors as the currency involved, the size of the contract, the length
of the contract period and the market conditions then prevailing. Since
transactions in foreign currency and forward contracts are usually conducted on
a principal basis, no fees or commissions are involved. The Trust may close out
a forward position in a currency by selling the forward contract or entering
into an offsetting forward contract.

LENDING OF PORTFOLIO SECURITIES

   
    The Trust may lend portfolio securities to member firms of the Exchange
under agreements which would require that the loans be secured continuously by
collateral in cash, cash


                                       3


<PAGE>


equivalents or U.S. Treasury bills maintained on a current basis at an
amount at least equal to the market value of the securities loaned. The Trust
would continue to receive the equivalent of the interest paid by the issuer on
the securities loaned and would also receive compensation based on investment of
the collateral. The Trust would not, however, have the right to vote any
securities having voting rights during the existence of the loan, but would call
the loan in anticipation of an important vote to be taken among holders of the
securities or of the giving or withholding of consent on a material matter
affecting the investment.    

  As with other extensions of credit there are risks of delay in recovery or
even loss of rights in the collateral should the borrower of the securities fail
financially. The Trust has no present intention to engage in any material
portfolio lending in the future. The Trust will lend portfolio securities only
to firms which have been approved in advance by the Trust's Board of Trustees,
which will monitor the creditworthiness of any such firms. The value of the
securities loaned will not exceed 5% of the value of the Trust's total assets.

RESTRICTED SECURITIES

   
     The Trust may invest up to 5% of its total assets in "restricted
securities" (i.e., securities that would be required to be registered prior to
distribution to the public), including restricted securities eligible for resale
to certain institutional investors pursuant to Rule 144A under the Securities
Act of 1933, as amended (the "1933 Act"). The Board of Trustees may adopt
guidelines and delegate to PMC the daily function of determining and monitoring
the liquidity of restricted securities. The Board, however, will retain
sufficient oversight and be ultimately responsible 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 carefully monitor the Trust's investments in these securities, focusing on
such important factors, among others, as valuation, liquidity and availability
of information. This investment practice could have the effect of increasing the
level of illiquidity in the Trust to the extent that qualified institutional
buyers become for a time uninterested in purchasing these restricted securities.
    

INVESTMENT RESTRICTIONS

   FUNDAMENTAL INVESTMENT RESTRICTIONS. The Trust has adopted certain
fundamental investment restrictions which may not be changed without the
affirmative vote of the holders of a majority of the Trust's outstanding voting
securities. As used in the Prospectus and Statement of Additional Information,
such approval means the approval of the lesser of (i) the holders of 67% or more
of the shares represented at a meeting if the holders of more than 50% of the
outstanding shares are present in person or by proxy, or (ii) the holders of
more than 50% of the outstanding shares.

         The Trust may not:

         (1)Issue senior securities, except as permitted by paragraphs (2), (6)
and (7) below. For purposes of this restriction, the issuance of shares of
beneficial interest in multiple classes or series, the purchase or sale of
options, futures contracts and options on futures contracts, forward
commitments, forward foreign exchange contracts and repurchase agreements
entered into in accordance with the Trust's investment policy, and the pledge,
mortgage or hypothecation of the Trust's assets within the meaning of paragraph
(3) below are not deemed to be senior securities.


                                       4


<PAGE>


         (2)Borrow money, except from banks as a temporary measure for
extraordinary emergency purposes in amounts not to exceed 33 1/3% of the Trust's
total assets (including the amount borrowed) taken at market value. The Trust
will not use leverage to attempt to increase income. The Trust will not purchase
securities while outstanding borrowings exceed 5% of the Trust's total assets.

         (3)Pledge, mortgage, or hypothecate its assets, except to secure
indebtedness permitted by paragraph (2) above and then only if such pledging,
mortgaging or hypothecating does not exceed 33 1/3% of the Trust's total assets
taken at market value.

   
         (4)Act as an underwriter, except to the extent that, in connection with
the disposition of portfolio securities, the Trust may be deemed to be an
underwriter for purposes of the 1933 Act.    

         (5)Purchase or sell real estate or any interest therein, except that
the Trust may invest in securities secured by real estate or marketable
interests therein or securities issued by companies (other than real estate
limited partnerships) that invest in real estate or interests therein.

         (6)Make loans, except that the Trust may lend portfolio securities,
enter into repurchase agreements, and purchase bank certificates of deposit, a
portion of an issue of publicly distributed bonds, bank loan participation
agreements, bankers' acceptances, debentures and other securities, whether or
not the purchase is made upon the original issuance of the securities, in
accordance with its investment policies.

         (7)Invest in commodities or commodity contracts or in puts, calls, or
combinations of both, except interest rate futures contracts, options on
securities, securities indices, currency and other financial instruments,
futures contracts on securities, securities indices, currency and other
financial instruments and options on such futures contracts, forward foreign
currency exchange contracts, forward commitments, securities index put or call
warrants and repurchase agreements entered into in accordance with the Trust's
investment policies.

         (8)Purchase securities of an issuer (other than the U.S. Government,
its agencies or instrumentalities), if

         (a)such purchase would cause more than 5% of the Trust's total assets
taken at market value to be invested in the securities of such issuer, or

         (b)such purchase would at the time result in more than 10% of the
outstanding voting securities of such issuer being held by the Trust.

 With the exception of forward foreign currency exchange contracts, forward
commitments and repurchase agreements, the Trust does not intend to invest more
than 5% of its assets during the current fiscal year in any of the investments
permitted by the exceptions set forth in paragraph (7) above.

   
      It is a fundamental policy of the Trust not to concentrate its investments
in securities of companies in any particular industry. Following the current
opinion of the staff of the SEC, investments are concentrated in a particular
industry if such investments aggregate 25% or more of the Trust's total assets.
The Trust's policy does not apply to investments in U.S. Government securities.
    


                                       5


<PAGE>


    NON-FUNDAMENTAL INVESTMENT RESTRICTIONS. The following restrictions have
been designated as non-fundamental and may be changed by a vote of the Trust's
Board of Trustees without approval of shareholders. The Trust has agreed to many
of these non-fundamental restrictions in connection with the offering of its
shares in various states and foreign countries.

         The Trust may not:

         (a)Participate on a joint-and-several basis in any securities trading
account. The "bunching" of orders for the sale or purchase of marketable
portfolio securities with other accounts under the management of the investment
adviser to save commissions or to average prices among them is not deemed to
result in a securities trading account.

         (b)Purchase securities on margin or make short sales unless by virtue
of its ownership of other securities, the Trust has the right to obtain
securities equivalent in kind and amount to the securities sold and, if the
right is conditional, the sale is made upon the same conditions, except that the
Trust may obtain such short-term credits as may be necessary for the clearance
of purchases and sales of securities and in connection with transactions
involving forward foreign currency exchange transactions.

         (c)Purchase a security if, as a result, (i) more than 10% of the
Trust's assets would be invested in securities of closed-end investment
companies, (ii) such purchase would result in more than 3% of the total
outstanding voting securities of any one such closed-end investment company
being held by the Trust, or (iii) more than 5% of the Trust's assets would be
invested in any one such closed-end investment company. The Trust will not
invest in the securities of any open-end investment company.

         (d)Purchase securities of any issuer which, together with any
predecessor, has a record of less than three years' continuous operations prior
to the purchase if such purchase would cause investments of the Trust in all
such issuers to exceed 5% of the value of the total assets of the Trust.

         (e)Invest in companies for the purpose of exercising control or
management.

   
         (f)Purchase warrants of any issuer, if, as a result of such purchases,
more than 2% of the value of the Trust's net assets would be invested in
warrants which are not listed on the Exchange or the American Stock Exchange or
more than 5% of the value of the net assets of the Trust would be invested in
warrants generally, whether or not so listed. For these purposes, warrants are
to be valued at the lesser of cost or market, but warrants acquired by the Trust
in units with or attached to debt securities shall be deemed to be without
value.    

         (g)Knowingly purchase or retain securities of an issuer if one or more
of the Trustees or officers of the Trust or directors or officers of the
investment adviser or any investment management subsidiary of the investment
adviser individually owns beneficially more than 0.5% and together own
beneficially more than 5% of the securities of such issuer.

         (h)Purchase interests in oil, gas or other mineral leases or
exploration programs; however, this policy will not prohibit the acquisition of
securities of companies engaged in the production or transmission of oil, gas or
other minerals.

         (i)Invest in any security, including any repurchase agreement maturing
in more than seven days, which is illiquid if more than 15% of the total assets
of the Trust, taken at market value, would be invested in such securities.


                                       6


<PAGE>


         (j)Purchase puts, calls, straddles, spreads and any combination thereof
if the value of its investment in such securities will exceed 5% of its total
assets.

         (k)Write put or call options, or enter into futures contracts with
respect to more than 25% of its net assets.

    Many of these restrictions may not be changed without the approval of the
regulatory agencies in such states or foreign countries.

2.       MANAGEMENT OF THE TRUST

      The Trust's Board of Trustees provides broad supervision over the affairs
of the Trust. The officers of the Trust are responsible for the Trust's
operations. The Trustees and executive officers of the Trust are listed below,
together with their principal occupations during the past five years. An
asterisk indicates those Trustees who are interested persons of the Trust within
the meaning of the Investment Company Act of 1940, as amended (the "1940 Act").

   
JOHN F. COGAN, JR.*, CHAIRMAN OF THE BOARD, PRESIDENT AND TRUSTEE, DOB:  JUNE
1926
President, Chief Executive Officer and a Director of The Pioneer Group,
Inc. ("PGI"); Chairman and a Director of Pioneering Management Corporation
("PMC") and Pioneer Funds Distributor, Inc. ("PFD"); Director of Pioneering
Services Corporation ("PSC"), Pioneer Capital Corporation ("PCC"), Pioneer Real
Estate Advisors, Inc., Pioneer Forest, Inc., Pioneer Explorer, Inc., Pioneer
Management (Ireland) Ltd. ("PMIL") and Closed Joint Stock Company
"Forest-Starma"; President and Director of Pioneer Metals and Technology, Inc.
("PMT"), Pioneer International Corp. ("PIntl"), Pioneer First Russia, Inc.
("First Russia") and Pioneer Omega, Inc. ("Omega"); Chairman of the Board and
Director of Pioneer Goldfields Limited ("PGL") and Teberebie Goldfields Limited;
Chairman of the Supervisory Board of Pioneer Fonds Marketing, GmbH, Pioneer
First Polish Trust Fund Joint Stock Company, S.A. and Pioneer Czech Investment
Company, A.S.; Chairman, President and Trustee of all of the Pioneer mutual
funds; Director of Pioneer Global Equity Fund Plc, Pioneer Global Bond Fund Plc,
Pioneer DM Cashfonds Plc, Pioneer European Equity Fund Plc, Pioneer Central &
Eastern Europe Fund Plc and Pioneer US Real Estate Fund Plc; and Partner, Hale
and Dorr LLP (counsel to PGI and the Trust).

MARY K. BUSH, TRUSTEE, DOB:  APRIL 1948
4201 CATHEDRAL AVENUE, NW, WASHINGTON, DC  20016
   President, Bush & Co., an international financial advisory firm; Director
and/or Trustee of Mortgage Guaranty Insurance Corporation, Novecon Management
Company, Hoover Institution, Folger Shakespeare Library, March of Dimes, Project
2000, Inc. (not-for-profit educational organization), Small Enterprise
Assistance Fund and Wilberforce University; Advisory Board member, Washington
Mutual Investors Fund, a registered investment company; and Trustee of all of
the Pioneer mutual funds, except Pioneer Variable Contracts Trust.    

RICHARD H. EGDAHL, M.D., TRUSTEE, DOB:  DECEMBER 1926
   
BOSTON UNIVERSITY HEALTH POLICY INSTITUTE, 53 BAY STATE ROAD, BOSTON, MA  02115
   Professor of Management, Boston University School of Management; Professor of
Public Health, Boston University School of Public Health; Professor of Surgery,
Boston University School of Medicine; Director, Boston University Health Policy
Institute and Boston Medical Center; Executive Vice President and Vice Chairman
of the Board, University Hospital; Academic Vice President for Health Affairs,
Boston University; Director, Essex Investment


                                       7


<PAGE>


Management Company, Inc. (investment adviser), Health Payment Review, Inc.
(health care containment software firm), Mediplex Group, Inc. (nursing care
facilities firm), Peer Review Analysis, Inc. (health care facilities firm) and
Springer-Verlag New York, Inc. (publisher); Honorary Trustee, Franciscan
Children's Hospital; and Trustee of all of the Pioneer mutual funds.     

MARGARET B.W. GRAHAM, TRUSTEE, DOB:  MAY 1947
   
THE KEEP, P.O. BOX 110, LITTLE DEER ISLE, ME  04650
Founding Director, The Winthrop Group, Inc (consulting firm); Manager of
Research Operations, Xerox Palo Alto Research Center, from 1991 to 1994;
Professor of Operations Management and Management of Technology and Associate
Dean, Boston University School of Management, from 1989 to 1993; and Trustee of
all of the Pioneer mutual funds, except Pioneer Variable Contracts Trust.    

JOHN W. KENDRICK, TRUSTEE, DOB:  JULY 1917
6363 WATERWAY DRIVE, FALLS CHURCH, VA  22044
   
Professor  Emeritus,  George  Washington  University;   Director,  American
Productivity and Quality Center; Adjunct Scholar, American Enterprise Institute;
Economic Consultant; and Trustee of all of the Pioneer mutual funds, except
Pioneer Variable Contracts Trust.    

MARGUERITE A. PIRET, TRUSTEE, DOB:  MAY 1948
   
ONE BOSTON PLACE, SUITE 2635, BOSTON,  MA 02108
    President, Newbury, Piret & Company, Inc. (merchant banking firm); Trustee
of Boston Medical Center; Member of the Board of Governors of the Investment
Company Institute; and Trustee of all of the Pioneer mutual funds.    

DAVID D. TRIPPLE*, TRUSTEE AND EXECUTIVE VICE PRESIDENT, DOB:  FEBRUARY 1944
   
     Executive Vice President and a Director of PGI; President, Chief Investment
Officer and a Director of PMC; Director of PFD, PCC, PIntl, First Russia, Omega,
Pioneer SBIC Corporation ("Pioneer SBIC"), PMIL, Pioneer Global Equity Fund Plc,
Pioneer Global Bond Fund Plc, Pioneer DM Cashfonds Plc, Pioneer European Equity
Fund Plc, Pioneer Central & Eastern Europe Fund Plc and Pioneer US Real Estate
Fund Plc; and Executive Vice President and Trustee of all of the Pioneer mutual
funds.    

STEPHEN K. WEST, TRUSTEE, DOB:  SEPTEMBER 1928
125 BROAD STREET, NEW YORK, NY  10004
   
Of Counsel to Sullivan & Cromwell (law firm); Trustee, The Winthrop Focus Funds
(mutual funds); and Trustee of all of the Pioneer mutual funds.    

JOHN WINTHROP, TRUSTEE, DOB:  JUNE 1936
ONE NORTH ADGERS WHARF, CHARLESTON, SC  29401
   
President, John Winthrop & Co., Inc. (private investment firm); Director of
NUI Corp. (energy sales, services and distribution); and Trustee of all of the
Pioneer mutual funds, except Pioneer Variable Contracts Trust.    

WILLIAM H. KEOUGH, TREASURER, DOB:  APRIL 1937
   
Senior Vice President, Chief Financial Officer and Treasurer of PGI;
Treasurer of PFD, PMC, PSC, PCC, PIntl, PMT, PGL, First Russia, Omega and
Pioneer SBIC; and Treasurer of all of the Pioneer mutual funds.    


                                       8


<PAGE>


JOSEPH P. BARRI, SECRETARY, DOB:  AUGUST 1946
   
Secretary of PGI and most of its subsidiaries; Secretary of all of the
Pioneer mutual funds; and Partner, Hale and Dorr LLP.    

ERIC W. RECKARD, ASSISTANT TREASURER, DOB:  JUNE 1956
   
Manager of Fund Accounting of PMC since May 1994, Manager of Auditing;
Compliance and Business Analysis for PGI prior to May 1994; and Assistant
Treasurer of all of the Pioneer mutual funds.    

ROBERT P. NAULT, ASSISTANT SECRETARY, DOB:  MARCH 1964
   
General Counsel and Assistant Secretary of PGI since 1995; Assistant
Secretary of PMC, PIntl, PGL, First Russia, Omega and all of the Pioneer mutual
funds; Assistant Clerk of PFD and PSC; and junior partner of Hale and Dorr LLP
prior to 1995.    

RICHARD A. SCHLANGER, VICE PRESIDENT, DOB:  JULY 1948
Vice President of PMC.

   
      The Trust's Declaration of Trust, dated April 30, 1992 (the
"Declaration"), provides that the holders of two-thirds of its outstanding
shares may vote to remove a Trustee of the Trust at any meeting of shareholders.
See "Description of Shares" below. The business address of all officers is 60
State Street, Boston, Massachusetts 02109.

    All of the outstanding capital stock of PFD, PMC and PSC is owned, directly
or indirectly, by PGI, a publicly owned Delaware corporation. PMC, the Trust's
investment adviser, serves as the investment adviser for the Pioneer mutual
funds listed below and manages the investments of certain institutional
accounts.    

   The table below lists all the Pioneer mutual funds currently offered to the
public and the investment adviser and principal underwriter for each fund.

                                            Investment        Principal
FUND NAME                                     ADVISER        UNDERWRITER

   
Pioneer World Equity Fund                       PMC              PFD
Pioneer International Growth Fund               PMC              PFD
Pioneer Europe Fund                             PMC              PFD
Pioneer Emerging Markets Fund                   PMC              PFD
Pioneer India Fund                              PMC              PFD
Pioneer Capital Growth Fund                     PMC              PFD
Pioneer Mid-Cap Fund                            PMC              PFD
Pioneer Growth Shares                           PMC              PFD
Pioneer Small Company Fund                      PMC              PFD
Pioneer Independence Fund                       PMC              PFD
Pioneer Gold Shares                             PMC              PFD
Pioneer Equity-Income Fund                      PMC              PFD
Pioneer Fund                                    PMC              PFD
Pioneer II                                      PMC              PFD
Pioneer Real Estate Shares                      PMC              PFD
Pioneer Balanced Fund                           PMC              PFD
Pioneer Short-Term Income Trust                 PMC              PFD
Pioneer America Income Trust                    PMC              PFD
Pioneer Bond Fund                               PMC              PFD


                                       9


<PAGE>


Pioneer Intermediate Tax-Free Fund              PMC              PFD
Pioneer Tax-Free Income Fund                    PMC              PFD
Pioneer Cash Reserves Fund                      PMC              PFD
Pioneer Interest Shares                         PMC              Note 1
Pioneer Variable Contracts Trust                PMC              Note 2    

Note 1 This fund is a closed-end fund.

   
Note 2 This is a series of ten separate portfolios designed to provide
       investment vehicles for the variable annuity and variable life
       insurance contracts of various insurance companies or for certain
       qualified pension plans.

To the knowledge of the Trust, no officer or Trustee of the Trust owned 5% or
more of the issued and outstanding shares of PGI on the date of this Statement
of Additional Information, except Mr. Cogan who then owned approximately 14% of
such shares. As of the date of this Statement of Additional Information, the
Trustees and officers of the Trust owned beneficially in the aggregate
approximately 5.87% of the Trust's outstanding Class A shares (5.19% of the
outstanding shares of the Trust). As of February 28, 1998, Merrill Lynch Pierce
Fenner & Smith, Inc. for the Sole Benefit of its Customers, 4800 Deer Lake Drive
East, 3rd Floor, Jacksonville, Florida 32246-6484 owned of record approximately
570,486 Class A shares (5.15% of the Class A shares outstanding) and 337,339
Class B shares (22.99% of the Class B shares outstanding) of the Trust, and John
F. Cogan, Jr., The Pioneer Group, Inc., 60 State Street, Boston, Massachusetts
02109 owned of record approximately 633,199 Class A shares (5.72% of the Class A
shares outstanding) of the Trust.    

COMPENSATION OF OFFICERS AND TRUSTEES

   
The Trust pays no salaries or compensation to any of its officers: however, the
Trust pays an annual trustees' fee to each Trustee who is not affiliated with
PGI, PMC, PFD or PSC consisting of two components: (a) a base fee of $500 and
(b) a variable fee, calculated on the basis of the average net assets of the
Trust. In addition, the Trust pays a per meeting fee of $120 to each Trustee who
is not affiliated with PGI, PMC, PFD or PSC and pays an annual trustees' fee of
$500 plus expenses to each Trustee affiliated with PGI, PMC, PFD or PSC. The
Trust also pays an annual committee participation fee to each Trustee who serves
as a member of any committees established to act on behalf of one or more of the
Pioneer mutual funds. Committee fees are allocated to the Trust on the basis of
the Trust's average net assets. Each Trustee who is a member of the Audit
Committee for the Pioneer mutual funds receives an annual fee equal to 10% of
the aggregate annual trustees' fee, except the Committee Chair who receives an
annual trustees' fee equal to 20% of the aggregate annual trustees' fee. Members
of the Pricing Committee for the Pioneer mutual funds, as well as any other
committee which renders material functional services to the Boards of Trustees
for the Pioneer mutual funds, receives an annual fee equal to 5% of the annual
trustees' fee, except the Committee Chair who receives an annual trustees' fee
equal to 10% of the annual trustees' fee. Each Trustee who is not affiliated
with PGI, PMC, PFD or PSC also receives $375 per meeting for attendance at
meetings of the Non-Interested Trustees Committee, except for the Committee
Chair who receives an additional $375 per meeting. Any such fees paid to
affiliated or interested persons of PGI, PMC, PFD or PSC are reimbursed to the
Trust under its management contract..

The following table sets forth certain information with respect to compensation
of each Trustee of the Trust:    


                                       10


<PAGE>


<TABLE>
<CAPTION>

   
                                                PENSION OR RETIREMENT    TOTAL COMPENSATION FROM
                                                BENEFITS ACCRUED AS      THE TRUST AND OTHER
                         AGGREGATE              PART OF TRUST EXPENSES   PIONEER MUTUAL FUNDS**
                         COMPENSATION FROM
NAME OF TRUSTEE          THE TRUST*    

<S>                    <C>                    <C>                      <C>

   
John F. Cogan, Jr.           $   500                       $0                 $  12,000
Mary K. Bush                     733                        0                    30,000
Richard H. Egdahl, M.D.        1,774                        0                    62,000
Margaret B.W. Graham           1,774                        0                    60,000
John W. Kendrick               1,774                        0                    55,800
Marguerite A. Piret            2,019                        0                    80,000
David D. Tripple                 500                        0                    12,000
Stephen K. West                1,886                        0                    63,800
John Winthrop                  1,989                        0                    69,000
                               -----                        -                    ------
Totals                       $12,949                       $0                  $444,600
</TABLE>

*        For the fiscal year ended November 30, 1997.
**      For the calendar year ended December 31, 1997.    

3.       INVESTMENT ADVISER

   
The Trust has contracted with PMC, 60 State Street, Boston, Massachusetts 02109,
to act as its investment adviser. PMC assists in the management of the Trust and
is authorized in its discretion to buy and sell securities for the account of
the Trust, subject to the right of the Trustees to disapprove any such purchase
or sale. A description of the services provided to the Trust under the
management contract and the expenses paid by the Trust is set forth in the
Prospectus under the caption "Management of the Trust."

The management contract is renewable annually by the vote of a majority of the
Board of Trustees of the Trust (including a majority of the Board of Trustees
who are not parties to the contract or interested persons of any such parties)
cast in person at a meeting called for the purpose of voting on such renewal.
This contract terminates if assigned and may be terminated without penalty by
either party by the giving of 60 days' written notice.    

As compensation for its management services and expenses incurred, PMC is
entitled to a management fee at the rate of 0.50% per annum on the first $100
million; 0.45% on the next $200 million; and 0.40% on assets over $300 million.
The fee is normally computed daily and paid monthly.

Effective December 1, 1993, PMC agreed not to impose all or a portion of its
management fee to the extent necessary to limit the Trust's expenses to 0.85% of
its average daily net assets. This agreement is voluntary and temporary and may
be revised or terminated at any time.

   
During the fiscal years ended November 30, 1997, 1996 and 1995, PMC would have
earned management fees of $253,266, $274,726 and $291,294, respectively, if the
voluntary expense limitation had not been in effect. PMC voluntarily agreed not
to impose a management fee during each of these periods.    


                                       11


<PAGE>


4.       UNDERWRITING AGREEMENT AND DISTRIBUTION PLANS

   
The Trust has entered into an underwriting agreement with PFD. The underwriting
agreement provides that PFD will bear any distribution expenses not borne by the
Trust.

PFD bears all expenses it incurs in providing services under the underwriting
agreement. Such expenses include compensation to its employees and
representatives and to securities dealers for distribution related services
performed for the Trust. PFD also pays certain expenses in connection with the
distribution of the Trust's shares, including the cost of preparing, printing
and distributing advertising or promotional materials, and the cost of printing
and distributing prospectuses and supplements to prospective shareholders. The
Trust bears the cost of registering its shares under federal, state and foreign
securities law.

The Trust and PFD have agreed to indemnify each other against certain
liabilities, including liabilities under the 1933 Act. Under the underwriting
agreement, PFD will use its best efforts in rendering services to the Trust.    

The Trust has adopted a plan of distribution pursuant to Rule 12b-1 under the
1940 Act with respect to Class A shares (the "Class A Plan") and a plan of
distribution with respect to Class B shares (the "Class B Plan") (together, the
"Plans").

         CLASS A PLAN

Pursuant to the Class A Plan, the Trust may reimburse PFD for its expenditures
in financing any activity primarily intended to result in the sale of Class A
shares. Certain categories of such expenditures have been approved by the Board
of Trustees and are set forth in the Prospectus. See "Distribution Plans" in the
Prospectus. The expenses of the Trust pursuant to the Class A Plan are accrued
on a fiscal year basis and may not exceed, with respect to Class A shares, the
annual rate of 0.25% of the Trust's average annual net assets attributable to
Class A shares. The Plan does not provide for the carryover of reimbursable
expenses beyond twelve months from the date they are incurred.

         CLASS B PLAN

   
The Class B Plan provides that the Trust shall pay PFD, as the Trust's
distributor for its Class B shares, a daily distribution fee equal on an annual
basis to 0.75% of the Trust's average daily net assets attributable to Class B
shares and will pay PFD a service fee equal to 0.25% of the Trust's average
daily net assets attributable to Class B shares (which PFD will in turn pay to
securities dealers which enter into a sales agreement with PFD at a rate of up
to 0.25% of the Trust's average daily net assets attributable to Class B shares
owned by investors for whom that securities dealer is the holder or dealer of
record). This service fee is intended to be consideration for personal services
and/or account maintenance services rendered by the dealer with respect to Class
B shares. PFD will advance to dealers the first-- year service fee at a rate
equal to 0.25% of the amount invested. As compensation therefore, PFD may retain
the service fee paid by the Trust with respect to such shares for the first year
after purchase. Dealers will become eligible for additional service fees with
respect to such shares commencing in the thirteenth month following purchase.
Dealers may from time to time be required to meet certain other criteria in
order to receive service fees. PFD or its affiliates are entitled to retain all
service fees payable under the Class B Plan for which there is no dealer of
record or for which qualification standards have not been met as partial
consideration for personal services and/or account maintenance services
performed by PFD or its affiliates for shareholder accounts.


                                       12


<PAGE>


The purpose of distribution payments to PFD under the Class B Plan is to
compensate PFD for its distribution services with respect to Class B shares of
the Trust. PFD pays commissions to dealers as well as expenses of printing
prospectuses and reports used for sales purposes, expenses with respect to the
preparation and printing of sales literature and other distribution related
expenses, including, without limitation, the cost necessary to provide
distribution-related services or personnel, travel, office expenses and
equipment. The Class B Plan also provides that PFD will receive all CDSCs
attributable to Class B shares. (See "Distribution Plans" in the Prospectus.)
When a broker-dealer sells Class B shares and elects, with PFD's approval, to
waive its right to receive the commission normally paid at the time of the sale,
PFD may cause all or a portion of the distribution fees described above to be
paid to the broker-dealer.    

GENERAL

   
In accordance with the terms of the Plans, PFD provides to the Trust for review
by the Trustees a quarterly written report of the amounts expended under the
respective Plans and the purpose for which such expenditures were made. In the
Trustees' quarterly review of the Plans, they will consider the continued
appropriateness and the level of reimbursement or compensation the Plans
provide.    

No interested person of the Trust, nor any Trustee of the Trust who is not an
interested person of the Trust, has any direct or indirect financial interest in
the operation of the Plans except to the extent that PFD and certain of its
employees may be deemed to have such an interest as a result of receiving a
portion of the amounts expended under the Plans by the Trust and except to the
extent certain officers may have an interest in PFD's ultimate parent, PGI.

The Plans were adopted by a majority vote of the Board of Trustees, including
all of the Trustees who are not, and were not at the time they voted, interested
persons of the Trust, as defined in the 1940 Act (none of whom had or have any
direct or indirect financial interest in the operation of the Plans), cast in
person at a meeting called for the purpose of voting on the Plans. In approving
the Plans, the Trustees identified and considered a number of potential benefits
which the Plans may provide. The Board of Trustees believes that there is a
reasonable likelihood that the Plans will benefit the Trust and its current and
future shareholders. Under their terms, the Plans remain in effect from year to
year provided such continuance is approved annually by vote of the Trustees in
the manner described above. The Plans may not be amended to increase materially
the annual percentage limitation of average net assets which may be spent for
the services described therein without approval of the shareholders of the Trust
affected thereby, and material amendments of the Plans must also be approved by
the Trustees in the manner described above. A Plan may be terminated at any
time, without payment of any penalty, by vote of the majority of the Trustees
who are not interested persons of the Trust and have no direct or indirect
financial interest in the operation of the Plan, or by a vote of a majority of
the outstanding voting securities (as defined in the 1940 Act) of the respective
class of the Trust. A Plan will automatically terminate in the event of its
assignment (as defined in the 1940 Act).

   
During the fiscal year ended November 30, 1997, the Trust incurred total
distribution fees pursuant to the Class A and Class B Plans of $114,554 and
$48,316, respectively. Distribution fees were paid by the Trust to PFD in
reimbursement of or as compensation for expenses related to servicing
shareholder accounts and to compensate dealers and sales personnel.

Redemptions of each class of shares may be subject to a CDSC. A CDSC of 0.50%
may be imposed on redemptions of certain net asset value purchases of Class A
shares within one year


                                       13


<PAGE>


of purchase. Class B shares that are redeemed within three years of
purchase are subject to a CDSC at declining rates starting at 2.0%, which are
based on the lower of the cost or market value of the shares being redeemed.
Proceeds of the CDSC are paid to PFD. For the fiscal year ended November 30,
1997, CDSCs in the amount of $47,504 were paid to PFD in reimbursement of or as
compensation for expenses related to servicing shareholder accounts and to
compensate dealers and sales personnel.    

5.       SHAREHOLDER SERVICING/TRANSFER AGENT

   
The Trust has contracted with PSC, 60 State Street, Boston, Massachusetts 02109,
to act as shareholder servicing and transfer agent for the Trust. This contract
may be terminated without penalty by either party upon 90 days' written notice.
    

Under the terms of its contract with the Trust, PSC will service shareholder
accounts, and its duties will include: (i) processing sales, redemptions and
exchanges of shares of the Trust; (ii) distributing dividends and capital gains
associated with Trust portfolio accounts; and (iii) maintaining account records
and responding to routine shareholder inquiries.

   
PSC receives an annual fee of $30.00 per shareholder account from the Trust as
compensation for the services described above. PSC is also reimbursed by the
Trust for its cash out-of-pocket expenditures. The annual fee is set at an
amount determined by vote of a majority of the Trustees (including a majority of
the Trustees who are not parties to the contract with PSC or interested persons
of any such parties) to be comparable to fees for such services being paid by
other investment companies. The Trust may compensate entities which have agreed
to provide certain sub-accounting services such as specific transaction
processing and record keeping services. Any such payments by the Trust would be
in lieu of the per account fee which would otherwise be paid by the Trust to
PSC.    

6.       CUSTODIAN

   
Brown Brothers Harriman & Co., 40 Water Street, Boston, Massachusetts 02109, is
the custodian (the "Custodian") of the Trust's assets. The Custodian's
responsibilities include safekeeping and controlling the Trust's cash and
securities, handling the receipt and delivery of securities, and collecting
interest and dividends on the Trust's investments. The Custodian does not
determine the investment policies of the Trust or decide which securities the
Trust will buy or sell. The Trust may, however, invest in securities, including
repurchase agreements, issued by the Custodian and may deal with the Custodian
as principal in securities transactions. Portfolio securities may be deposited
into the Federal Reserve-Treasury Department Book Entry System or the Depository
Trust Company.    

7.       PRINCIPAL UNDERWRITER

   
PFD, 60 State Street, Boston, Massachusetts 02109, serves as the principal
underwriter for the Trust in connection with the continuous offering of its
shares.    

The Trust will not generally issue Trust shares for consideration other than
cash. At the Trust's sole discretion, however, it may issue Trust shares for
consideration other than cash in connection with an acquisition of portfolio
securities or a merger or other reorganization.


                                       14


<PAGE>


   
The Trust has elected to be governed by Rule 18f-1 under the 1940 Act pursuant
to which the Trust is obligated to redeem shares solely in cash up to the lesser
of $250,000 or 1% of the Trust's net asset value during any 90-day period for
any one shareholder.

During the fiscal years ended November 30, 1997, 1996 and 1995, net underwriting
commissions retained by PFD in connection with its offering of Trust shares were
approximately $16,197, $21,000 and $24,247, respectively. Commissions reallowed
to dealers by PFD in the same periods were approximately $70,902, $94,000 and
$107,008, respectively.    

8.       INDEPENDENT PUBLIC ACCOUNTANTS

Arthur Andersen LLP, 225 Franklin Street, Boston, Massachusetts 02110, is the
Trust's independent public accountant, providing audit services, tax return
review, and assistance and consultation with respect to the preparation of
filings with the SEC.

9.       PORTFOLIO TRANSACTIONS

The Trust intends to fully manage its portfolio by buying and selling
securities, as well as holding securities to maturity. In managing its
portfolio, the Trust seeks to take advantage of market developments and yield
disparities, which may include use of the following strategies:

                  (1)      shortening the average maturity of its portfolio in
         anticipation of a rise in interest rates so as to minimize depreciation
         of principal;

                  (2) lengthening the average maturity of its portfolio in
         anticipation of a decline in interest rates so as to maximize yield;

                  (3) selling one type of debt security and buying another when
         disparities arise in the relative values of each; and

                  (4) changing from one debt security to an essentially similar
         debt security when their respective yields appear distorted due to
         market factors.

The Trust engages in portfolio trading if it believes a transaction net of costs
(including custodian charges) will help in achieving the Trust's investment
objective.

Decisions relating to the purchase and sale of securities for the Trust, the
allocation of portfolio transactions and, where applicable, the negotiation of
commission rates are made by officers of PMC.

   
The primary consideration in placing portfolio security transactions is
execution at the most favorable prices. PMC has complete freedom as to the
markets in which and the broker-dealers through which it seeks this result. Debt
securities are traded principally in the over-the-counter market on a net basis
through dealers acting for their own accounts and not as brokers. The cost of
securities purchased from underwriters includes an underwriter's commission or
concession, and the prices at which securities are purchased and sold from and
to dealers include a dealer's markup or markdown. PMC attempts to negotiate with
underwriters to decrease the commission or concession for the benefit of the
Trust. PMC normally seeks to deal directly with the primary market makers
unless, in its opinion, better prices are available elsewhere.


                                       15


<PAGE>


Subject to the requirement of seeking execution at the best available price,
securities may, as authorized by PMC's management contract, be bought from or
sold to dealers who furnish statistical research and other information or
services to PMC and the Trust, or who sell shares of any of the Pioneer mutual
funds. Brokerage and research services may include advice concerning the value
of securities; the advisability of investing in, purchasing or selling
securities; the availability of securities or the purchasers or sellers of
securities; providing stock price quotation services; furnishing analyses,
manuals and reports concerning issuers, securities, economic factors and trends,
portfolio strategy, performance of accounts, comparative fund statistics and
credit rating service information; and effecting securities transactions and
performing functions incidental thereto (such as clearance and settlement). PMC
maintains a listing of broker-dealers who provide such services on a regular
basis. However, because it is anticipated that many transactions on behalf of
the Trust and other investment companies or accounts managed by PMC are placed
with broker-dealers (including broker-dealers on the listing) without regard to
the furnishing of such services, it is not possible to estimate the proportion
of such transactions directed to such dealers solely because such services were
provided.

The research received from broker-dealers may be useful to PMC in rendering
investment management services to the Trust as well as other investment
companies or other accounts managed by PMC, although not all such research may
be useful to the Trust. Conversely, such information provided by brokers or
dealers who have executed transaction orders on behalf of such other PMC clients
may be useful to PMC in carrying out its obligations to the Trust. The receipt
of such research has not reduced PMC's normal independent research activities;
however, it enables PMC to avoid the additional expenses which might otherwise
be incurred if it were to attempt to develop comparable information through its
own staff.    

The Trustees periodically review PMC's performance of its responsibilities in
connection with the placement of portfolio transactions on behalf of the Trust.

   
In addition to the Trust, PMC acts as investment adviser to other Pioneer mutual
funds and certain private accounts with investment objectives similar to those
of the Trust. As such, securities may frequently meet the investment objectives
of the Trust, such other funds and such private accounts. In such cases, the
decision to recommend a purchase to one fund or account rather than another is
based on a number of factors. The determining factors in most cases are the
amount of securities of the issuer then outstanding, the value of those
securities and the market for them. Other factors considered in the investment
recommendations include other investments which each fund or account presently
has in a particular industry and the availability of investment funds in each
fund or account.    

It is possible that at times identical securities will be held by more than one
fund and/or account. However, positions in the same issue may vary and the
length of time that any fund or account may choose to hold its investment in the
same issue may likewise vary. To the extent that the Trust, another mutual fund
in the Pioneer group or a private account managed by PMC may not be able to
acquire as large a position in such security as it desires, it may have to pay a
higher price for the security. Similarly, the Trust may not be able to obtain as
large an execution of an order to sell or as high a price for any particular
portfolio security if PMC decides to sell on behalf of another account the same
portfolio security at the same time. On the other hand, if the same securities
are bought or sold at the same time by more than one fund or account, the
resulting participation in volume transactions could produce better executions
for the Trust or the account. In the event more than one account purchases or
sells the same security on a given date, the purchases and sales will normally
be made as nearly as practicable on a pro rata basis in proportion to the
amounts desired to be purchased or sold by each.

       


                                       16


<PAGE>


10.      TAX STATUS

   
It is the Trust's policy to meet the requirements of Subchapter M of the Code
for qualification as a regulated investment company. These requirements relate
to the sources of the Trust's income, the diversification of its assets and the
distribution of its income to shareholders. If the Trust meets all such
requirements and distributes to its shareholders, in accordance with the Code's
timing requirements, all investment company taxable income and net capital gain,
if any, which it earns, the Trust will be relieved of the necessity of paying
federal income tax.    

   
In order to qualify as a regulated investment company under Subchapter M, the
Trust must, among other things, derive at least 90% of its annual gross income
from dividends, interest, payments with respect to securities loans, gains from
the sale or other disposition of stock, securities or foreign currencies, or
other income (including gains from forward contracts) derived with respect to
its business of investing in such stock, securities or currencies (the "90%
income test") and satisfy certain annual distribution and quarterly
diversification requirements.    

   
Dividends from investment company taxable income, which includes net investment
income, net short-term capital gain in excess of net long-term capital loss, and
certain net foreign exchange gains, are taxable as ordinary income, whether
received in cash or reinvested in additional shares. Dividends from net
long-term capital gain in excess of net short-term capital loss ("net capital
gain"), if any, whether received in cash or reinvested in additional shares, are
taxable to the Trust's shareholders as capital gains for federal income tax
purposes without regard to the length of time shares of the Trust have been
held. As a result of the enactment of the Taxpayer Relief Act of 1997 (the "1997
TRA") on August 5, 1997, gain recognized after May 6, 1997 from the sale of a
capital asset is taxable to individual (noncorporate) investors at different
maximum federal income tax rates, depending generally upon the tax holding
period for the asset, the federal income tax bracket of the taxpayer, and the
dates the asset was acquired and/or sold. The Treasury Department has issued
guidance under the 1997 TRA that (subject to possible modification by future
"technical corrections" legislation) enables the Trust to pass through to its
shareholders the benefits of the capital gains tax rates enacted in the 1997
TRA. The Trust will provide appropriate information to its shareholders about
its distributions, including the tax rate(s) applicable to its distributions
from long-term capital gains, in accordance with this and any future guidance.
Shareholders should consult their own tax advisers on the correct application of
these new rules in their particular circumstances.    

Any dividend declared by the Trust in October, November or December as of a
record date in such a month and paid during the following January will be
treated for federal income tax purposes as received by shareholders on December
31 of the calendar year in which it is declared.

   
Foreign exchange gains and losses realized by the Trust in connection with
certain transactions involving foreign currency-denominated debt securities,
foreign currency forward contracts, foreign currencies, or payables or
receivables denominated in a foreign currency are subject to Section 988 of the
Code, which generally causes such gains and losses to be treated as ordinary
income and losses and may affect the amount, timing and character of
distributions to shareholders. Under future regulations, any such transactions
that are not directly related to the Trust's investments in stock or securities
may need to be limited in order to enable the Trust to satisfy the 90% income
test. If the net foreign exchange loss for a year were to exceed the Trust's
investment company taxable income (computed without regard to such loss), the
resulting ordinary loss for such year would not be deductible by the Trust or
its shareholders in future years.


                                       17


<PAGE>


If the Trust acquires any equity interest (under proposed regulations, generally
including not only stock but also an option to acquire stock such as is inherent
in a convertible bond) in certain foreign corporations that receive at least 75%
of their annual gross income from passive sources (such as interest, dividends,
certain rents and royalties, or capital gains) or hold at least 50% of their
assets in investments producing such passive income ("passive foreign investment
companies"), the Trust could be subject to federal income tax and additional
interest charges on "excess distributions" received from such companies or gain
from the sale of stock in such companies, even if all income or gain actually
received by the Trust is timely distributed to its shareholders. The Trust would
not be able to pass through to its shareholders any credit or deduction for such
a tax. An election may generally be available that would ameliorate these
adverse tax consequences, but any such election could require the Trust to
recognize taxable income or gain (subject to distribution requirements) without
the concurrent receipt of cash. These investments could also result in the
treatment of associated capital gains as ordinary income. The Trust may limit
and/or manage its holdings in passive foreign investment companies to minimize
its tax liability or maximize its return from these investments.

If the Trust invests in certain pay-in-kind securities ("PIKs"), zero coupon
securities, deferred interest securities or, in general, any other securities
with original issue discount (or with market discount if the Trust elects to
include market discount in income currently), the Trust must accrue income on
such investments for each taxable year, which generally will be prior to the
receipt of the corresponding cash payments. However, the Trust must distribute,
at least annually, all or substantially all of its net income, including such
accrued income, to shareholders to qualify as a regulated investment company
under the Code and avoid federal income and excise taxes. Therefore, the Trust
may have to dispose of its portfolio securities under disadvantageous
circumstances to generate cash, or may have to leverage itself by borrowing the
cash, to satisfy distribution requirements.    

For federal income tax purposes, the Trust is permitted to carry forward a net
capital loss for any year to offset its capital gains, if any, during the eight
years following the year of the loss. To the extent subsequent capital gains are
offset by such losses, they would not result in federal income tax liability to
the Trust and therefore are not expected to be distributed as such to
shareholders. As of the end of its most recent taxable year, the Trust had no
capital loss carryforwards.

   
At the time of an investor's purchase of Trust shares, a portion of the purchase
price may be attributable to realized or unrealized appreciation in the Trust's
portfolio. Consequently, subsequent distributions by the Trust on these shares
from such appreciation may be taxable to such investor even if the net asset
value of the investor's shares is, as a result of the distributions, reduced
below the investor's cost for such shares and the distributions economically
represent a return of a portion of the investment.

Redemptions and exchanges are taxable events for shareholders that are subject
to tax. Shareholders should consult their own tax advisers with reference to
their individual circumstances to determine whether any particular transaction
in Trust shares is properly treated as a sale for tax purposes, as the following
discussion assumes, and the character of and tax rate applicable to any gains or
losses recognized in such transactions under the new rate structure enacted in
the 1997 TRA. Any loss realized by a shareholder upon the redemption, exchange
or other disposition of shares with a tax holding period of six months or less
will be treated as a long-term capital loss to the extent of any amounts treated
as distributions of long-term capital gain with respect to such shares.


                                       18


<PAGE>


In addition, if Class A shares redeemed or exchanged have been held for less
than 91 days, (1) in the case of a reinvestment in the Trust at net asset value
pursuant to the reinvestment privilege, the sales charge paid on such shares is
not included in their tax basis under the Code, and (2) in the case of an
exchange, all or a portion of the sales charge paid on such shares is not
included in their tax basis under the Code, to the extent a sales charge that
would otherwise apply to the shares received is reduced pursuant to the exchange
privilege. In either case, the portion of the sales charge not included in the
tax basis of the shares redeemed or surrendered in an exchange is included in
the tax basis of the shares acquired in the reinvestment or exchange. Losses on
redemptions or other dispositions of shares may be disallowed under "wash sale"
rules in the event of other investments in the Trust (including those made
pursuant to reinvestment of dividends and/or capital gain distributions) within
a period of 61 days beginning 30 days before and ending 30 days after a
redemption or other disposition of shares. In such a case, the disallowed
portion of any loss would be included in the federal tax basis of the shares
acquired in the other investments.

Certain foreign currency forward contracts may cause the Trust to recognize
gains or losses from marking-to-market even though such forward contracts may
not have been performed or closed out. Forward contracts relating to foreign
currency are subject to Section 988, as described above, and accordingly
generally produce ordinary income or loss. Additionally, the Trust may be
required to recognize gain if a forward contract or other transaction that is
not subject to the mark to market rules is treated as a "constructive sale" of
an "appreciated financial position" held by the Trust under Section 1259 of the
Code. Any net mark to market gains and/or gains from constructive sales may also
have to be distributed to satisfy the distribution requirements referred to
above even though no corresponding cash amounts may concurrently be received,
possibly requiring the disposition of portfolio securities or borrowing to
obtain the necessary cash. Losses on certain forward contracts and/or offsetting
positions (portfolio securities or other positions with respect to which the
Trust's risk of loss is substantially diminished by one or more forward
contracts) may also be deferred under the tax straddle rules of the Code, which
may also affect the characterization of capital gains or losses from straddle
positions and certain successor positions as long-term or short-term. Certain
tax elections may be available that would enable the Trust to ameliorate some
adverse effects of the tax rules described in this paragraph. The tax rules
applicable to forward contracts and straddles may affect the amount, timing and
character of the Trust's income and losses and hence of its distributions to
shareholders.    

The Trust's dividends and distributions will generally not qualify for any
dividends-received deduction that might otherwise be available for certain
dividends received by shareholders that are corporations.

   
The Trust may be subject to withholding and other taxes imposed by foreign
countries including taxes on interest, dividends and capital gains with respect
to its investments in those countries. Tax conventions between certain countries
and the U.S. may reduce or eliminate such taxes in some cases. The Trust does
not expect to satisfy the requirements for passing through to its shareholders
their pro rata shares of qualified foreign taxes paid by the Trust, with the
result that shareholders will not include such taxes in their gross incomes and
will not be entitled to a tax deduction or credit for such taxes on their own
tax returns.    

Different tax treatment, including penalties on certain excess contributions and
deferrals, certain pre-retirement and post-retirement distributions, and certain
prohibited transactions, is accorded to accounts maintained as qualified
retirement plans. Shareholders should consult their tax advisers for more
information.


                                       19


<PAGE>


A state income (and possibly local income and/or intangible property) tax
exemption is generally available to the extent the Trust's distributions are
derived from interest on (or, in the case of intangible property taxes, the
value of its assets is attributable to) certain U.S. Government obligations,
provided in some states that certain thresholds for holdings of such obligations
and/or reporting requirements are satisfied. The Trust will not seek to satisfy
any threshold or reporting requirements that may apply in particular taxing
jurisdictions, although the Trust may in its sole discretion provide relevant
information to shareholders.

   
Federal law requires that the Trust withhold (as "backup withholding") 31% of
reportable payments, including dividends, capital gain dividends and the
proceeds of redemptions (including exchanges) and repurchases to shareholders
who have not complied with IRS regulations. In order to avoid this withholding
requirement, shareholders must certify on their Account Applications, or on
separate IRS Forms W-9, that the Social Security Number or other Taxpayer
Identification Number they provide is their correct number and that they are not
currently subject to backup withholding, or that they are exempt from backup
withholding. The Trust may nevertheless be required to withhold if it receives
notice from the IRS or a broker that the number provided is incorrect or backup
withholding is applicable as a result of previous underreporting of interest or
dividend income.    

   
If, as anticipated, the Trust continues to qualify as a regulated investment
company under the Code, it will not be required to pay any Massachusetts income,
corporate excise or franchise taxes.    

The description of certain federal tax provisions above relates only to U.S.
federal income tax consequences for shareholders who are U.S. persons, i.e. U.S.
citizens or residents or U.S. corporations, partnerships, trusts or estates, and
who are subject to U.S. federal income tax. This description does not address
the special tax rules that may be applicable to particular types of investors,
such as financial institutions, insurance companies, securities dealers, or
tax-exempt or tax-deferred plans, accounts or entities. Investors other than
U.S. persons may be subject to different U.S. tax treatment, including a
possible 30% non-resident alien U.S. withholding tax (or non-resident alien
withholding tax at a lower treaty rate) on amounts treated as ordinary dividends
from the Trust and, unless an effective IRS Form W-8 or authorized substitute
for Form W-8 is on file, to 31% backup withholding on certain other payments
from the Trust. Shareholders should consult their own tax advisers on these
matters and on state, local and other applicable tax laws.

11.      DESCRIPTION OF SHARES

   
The Declaration permits its Board of Trustees to authorize the issuance of an
unlimited number of full and fractional shares of beneficial interest (without
par value) which may be divided into such separate series as the Trustees may
establish. The Trustees may establish additional series of shares, and may
divide or combine the shares into a greater or lesser number of shares without
thereby changing the proportionate beneficial interests in the Trust. The
Declaration further authorizes the Trustees to classify or reclassify any series
of the shares into one or more classes. Pursuant thereto, the Trustees have
authorized the issuance of two classes of shares of the Trust, Class A shares
and Class B shares. Each share of a class of the Trust represents an equal
proportionate interest in the assets of the Trust allocable to that class. Upon
liquidation of the Trust, the shareholders of each class are entitled to share
pro rata in the Trust's net assets allocable to such class available for
distribution to shareholders. The Trust reserves the right to create and issue
additional series or classes of shares, in which case the shares of each class
of a series would participate equally in the earnings, dividends and assets
allocable to that class of the particular series.    


                                       20


<PAGE>


The shares of the Trust are entitled to vote separately to approve investment
advisory agreements or changes in investment restrictions, but shareholders of
all series vote together in the election and selection of Trustees and
accountants. Shares of the Trust vote together as a class on matters that affect
the Trust in substantially the same manner. As to matters affecting a single
class, shares of such class will vote separately.

   
Although Trustees are not elected annually by the shareholders, shareholders
holding 10% or more of the outstanding shares of the Trust may cause the Trust
to hold a meeting of shareholders for the purpose of voting upon the question of
the removal of one or more Trustees. Removal shall require the affirmative vote
of the holders of two-thirds of the shares of the Trust outstanding and entitled
to vote at a meeting called for such purpose. No amendment that adversely
affects the rights of shareholders may be made to the Declaration without the
affirmative vote of a majority of its shares. Shares have no preemptive or
conversion rights. Shares are fully paid and non-assessable, except as set forth
below. See "Certain Liabilities."    

12.      CERTAIN LIABILITIES

   
As a Massachusetts business trust, the Trust's operations are governed by the
Declaration, a copy of which is on file with the Office of the Secretary of
State of the Commonwealth of Massachusetts. Shareholders of a Massachusetts
business trust may, under certain circumstances, be held personally liable for
the obligations of the trust. However, the Declaration contains an express
disclaimer of shareholder liability for acts or obligations of the Trust or any
series of the Trust and provides that notice of such disclaimer be given in each
agreement, obligation or instrument entered into or executed by the Trust or its
Trustees. Moreover, the Declaration provides for the indemnification out of
Trust property of any shareholders held personally liable for any obligations of
the Trust or any series of the Trust. The Declaration also provides that the
Trust shall, upon request, assume the defense of any claim made against any
shareholder for any act or obligation of the Trust and satisfy any judgment
thereon. Thus, the risk of a shareholder incurring financial loss beyond his or
her investment because of shareholder liability would be limited to
circumstances in which the Trust itself will be unable to meet its obligations.
In light of the nature of the Trust's business and the nature and amount of its
assets, the possibility of the Trust's liabilities exceeding its assets, and
therefore a shareholder's risk of personal liability, is remote.    

   
The Declaration further provides that the Trust shall indemnify each of its
Trustees and officers against liabilities and expenses reasonably incurred by
them, in connection with, or arising out of, any action, suit or proceeding,
threatened against or otherwise involving such Trustee or officer, directly or
indirectly, by reason of being or having been a Trustee or officer of the Trust.
The Declaration does not authorize the Trust to indemnify any Trustee or officer
against any liability to which he or she would otherwise be subject by reason of
or for willful misfeasance, bad faith, gross negligence or reckless disregard of
such person's duties.    

13.      DETERMINATION OF NET ASSET VALUE

   
The net asset value per share of each class of the Trust is determined as of the
close of regular trading (normally 4:00 p.m., Eastern time) on each day on which
the Exchange is open for trading. As of the date of this Statement of Additional
Information, the Exchange is open for trading every weekday except for the
following holidays: New Year's Day, Martin Luther King, Jr. Day, Presidents'
Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day
and Christmas Day. The net asset value per share of each class of the Trust


                                       21


<PAGE>


is also determined on any other day in which the level of trading in its
portfolio securities is sufficiently high so that the current net asset value
per share might be materially affected by changes in the value of its portfolio
securities. The net asset value per share of the Trust is not determined on any
day in which no purchase orders in good order for the shares of the Trust are
received and no shares are tendered for redemption.

The net asset value per share of each class of the Trust is computed by taking
the value of all of the Trust's assets attributable to a class, less the Trust's
liabilities attributable to that class, and dividing the result by the number of
outstanding shares of the class. For purposes of determining net asset value,
expenses of the classes of the Trust are accrued daily.    

The Board of Trustees has directed that the fair market value of the Trust's
assets should be determined as follows. Ordinarily, investments in debt
securities are valued on the basis of information furnished by a pricing service
which utilizes primarily a matrix system (which reflects such factors as
security prices, yields, maturities and ratings), supplemented by dealer and
exchange quotations, to recommend valuations for normal institutional-sized
trading units of debt securities. In addition, the Board has instructed advisory
personnel not to rely exclusively on this pricing service if the fair market
value of certain securities may be more accurately determined on the basis of
information available from other sources. Temporary cash investments are valued
at cost, which approximates market value.

The Trust's maximum offering price per Class A share is determined by adding the
maximum sales charge to the net asset value per Class A share. Class B shares
are offered at net asset value without the imposition of an initial sales
charge.

14.      SYSTEMATIC WITHDRAWAL PLAN

   
The Systematic Withdrawal Plan ("SWP") is designed to provide a convenient
method of receiving fixed payments at regular intervals from the Trust deposited
by the applicant under this SWP. The applicant must deposit or purchase for
deposit with PSC shares of the Trust having a total value of not less than
$10,000. Periodic payments of $50 or more will be deposited monthly or quarterly
directly into a bank account designated by the applicant or will be sent by
check to the applicant, or any person designated by the applicant. Withdrawals
from Class B share accounts are limited to 10% of the value of the account at
the time the SWP is established. See "Waiver or Reduction of Contingent Deferred
Sales Charge" in the Prospectus. Designation of another person to receive the
payments subsequent to opening an account must be accompanied by a signature
guarantee.    

Any income dividends or capital gains distributions on shares under the SWP will
be credited to the SWP account on the payment date in full and fractional shares
at the net asset value per share in effect on the record date.

   
SWP payments are made from the proceeds of the redemption of shares deposited
under the SWP in a SWP account. To the extent that such redemptions for periodic
withdrawals exceed dividend income reinvested in the SWP account, such
redemptions will reduce and may ultimately exhaust the number of shares
deposited in the SWP account. Redemptions are potentially taxable transactions
to shareholders. In addition, the amounts received by a shareholder cannot be
considered as an actual yield or income on his or her investment because part of
such payments may be a return of his or her investment.    

The SWP may be terminated at any time (1) by written notice to PSC or from PSC
to the shareholder; (2) upon receipt by PSC of appropriate evidence of the
shareholder's death; or


                                       22


<PAGE>


(3) when all shares under the SWP have been redeemed. The fees of PSC for
maintaining SWPs are paid by the Trust.

15.      LETTER OF INTENT

   
A Letter of Intent ( "LOI") may be established by completing the LOI section of
the Account Application. When you sign the Account Application, you agree to
irrevocably appoint PSC your attorney-in-fact to surrender for redemption any or
all shares held in escrow with full power of substitution. An LOI is not a
binding obligation upon the investor to purchase, or the Trust to sell, the full
amount indicated.

If the total purchases, less redemptions, exceed the amount specified under the
LOI and are in an amount which would qualify for a further quantity discount,
all transactions will be recomputed on the expiration date of the LOI to effect
the lower sales charge. Any difference in the sales charge resulting from such
recomputation will be either delivered to you in cash or invested in additional
shares at the lower sales charge. The dealer, by signing the Account
Application, agrees to return to PFD, as part of such retroactive adjustment,
the excess of the commission previously reallowed or paid to the dealer over
that which is applicable to the actual amount of the total purchases under the
LOI.

If the total purchases, less redemptions, are less than the amount specified
under the LOI, you must remit to PFD any difference between the sales charge on
the amount actually purchased and the amount originally specified in the LOI
section of the Account Application. When the difference is paid, the shares held
in escrow will be deposited to your account. If you do not pay the difference in
sales charge within 20 days after written request from PFD or your dealer, PSC,
after receiving instructions from PFD, will redeem the appropriate number of
shares held in escrow to realize the difference and release any excess. See "How
to Purchase Trust Shares - Letter of Intent" in the Prospectus for more
information.    

16.      INVESTMENT RESULTS

   
The Trust's yield and average annual total return quotations as they may appear
in the Prospectus, this Statement of Additional Information or in advertising
are calculated by standard methods prescribed by the SEC.    

QUOTATIONS, COMPARISONS, AND GENERAL INFORMATION

   
From time to time, in advertisements, in sales literature, or in reports to
shareholders, the past performance of the Trust may be illustrated and/or
compared with that of other mutual funds with similar investment objectives, and
to other relevant indices. For example, the Trust may compare its yield to the
Merrill Lynch 1-3 Year Government Bond Index, U.S. Government bond rates, or
other comparable indices or investment vehicles.    

In addition, the performance of the classes of the Trust may be compared to
alternative investment or savings vehicles and/or to indices or indicators of
economic activity, e.g., inflation or interest rates. Performance rankings and
listings reported in newspapers or national business and financial publications,
such as BARRON'S, BUSINESS WEEK, CONSUMER DIGEST, CONSUMER REPORTS, FINANCIAL
WORLD, FORBES, FORTUNE, INVESTORS BUSINESS DAILY, KIPLINGER'S PERSONAL FINANCE
MAGAZINE, MONEY MAGAZINE, NEW YORK TIMES, PERSONAL INVESTOR, SMART MONEY, USA
TODAY, U.S. NEWS AND WORLD REPORT, THE WALL STREET JOURNAL and WORTH may also be
cited (if the Trust is listed in any such publication) or used for comparison,
as well as performance listings and rankings from various other sources
including BLOOMBERG FINANCIAL


                                       23


<PAGE>


MARKETS, CDA WIESENBERGER, DONOGHUE'S MUTUAL FUND ALMANAC, INVESTMENT
COMPANY DATA, INC., IBBOTSON ASSOCIATES, JOHNSON'S CHARTS, KANON BLOCK CARRE AND
CO., LIPPER ANALYTICAL SERVICES, INC., MICROPAL, INC., MORNINGSTAR, INC.,
SCHABACKER INVESTMENT MANAGEMENT and TOWERS DATA SYSTEMS, INC.

In addition, from time to time quotations from articles from financial
publications such as those listed above may be used in advertisements, in sales
literature, or in reports to shareholders of the Trust.

In representing investment results of a class, the Trust may also include
references to certain financial planning concepts, including (a) an investor's
need to evaluate his financial assets and obligations to determine HOW MUCH TO
INVEST; (b) his need to analyze the objectives of various investments to
determine WHERE TO INVEST; and (c) his need to analyze his time frame for future
capital needs to determine HOW LONG TO INVEST. The investor controls these three
factors, all of which affect the use of investments in building assets.

STANDARDIZED YIELD QUOTATIONS

The yield of a class is computed by dividing the class' net investment income
per share during a base period of 30 days, or one month, by the maximum offering
price per share of the class on the last day of such base period in accordance
with the following formula:

                                         a-b
                           YIELD = 2[ ( ----- +1)6[superscript]-1]
                                          cd

Where:     a        =        interest earned during the period

           b        =        net expenses accrued for the period

           c        =        the average daily number of shares
                             outstanding during the period that were entitled to
                             receive dividends

           d        =        the maximum offering price per share on the last
                             day of the period

For purposes of calculating interest earned on debt obligations as provided in
item "a" above:

          (i) The yield to maturity of each obligation held by the Trust is
computed based on the market value of the obligation (including actual accrued
interest, if any) at the close of business each day during the 30-day base
period, or, with respect to obligations purchased during the month, the purchase
price (plus actual accrued interest, if any) on settlement date, and with
respect to obligations sold during the month the sale price (plus actual accrued
interest, if any) between the trade and settlement dates.

         (ii) The yield to maturity of each obligation is then divided by 360
and the resulting quotient is multiplied by the market value of the obligation
(including actual accrued interest, if any) to determine the interest income on
the obligation for each day. The yield to maturity calculation has been made on
each obligation during the 30 day base period.


                                       24


<PAGE>


        (iii) Interest earned on all debt obligations during the 30-day or one
month period is then totaled.

         (iv) The maturity of an obligation with a call provision(s) 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 the treatment of discount and premium on mortgage- or other
receivables-backed obligations which are expected to be subject to monthly
payments of principal and interest ("pay downs"), the Trust accounts for gain or
loss attributable to actual monthly pay downs as an increase or decrease to
interest income during the period. In addition, the Trust may elect (i) to
amortize the discount or premium remaining on a security, based on the cost of
the security, to the weighted average maturity date, if such information is
available, or to the remaining term of the security, if the weighted average
maturity date is not available, or (ii) not to amortize the remaining discount
or premium on a security.

For purposes of computing yield, interest income is recognized by accruing 1/360
of the stated interest rate of each obligation in the Trust's portfolio each day
that the obligation is in the portfolio. Expenses OF A CLASS accrued during any
base period, if any, pursuant to the RESPECTIVE Distribution Plans are included
among the expenses accrued during the base period.

The yield on Class A and Class B shares of the Trust for the 30-day period ended
November 30, 1997 computed as above was 5.12% and 4.41%, respectively, except
that absent expense limitations, the yield on Class A and Class B shares of the
Trust would have been 4.74% and 4.08%, respectively.

STANDARDIZED AVERAGE ANNUAL TOTAL RETURN QUOTATIONS AND OTHER PERFORMANCE
QUOTATIONS    

   
One of the primary methods used to measure the performance of a class of the
Trust is "total return." Total return will normally represent the percentage
change in value of an account, or of a hypothetical investment in the class,
over any period up to the lifetime of the class. Total return calculations will
usually assume the reinvestment of all dividends and capital gains distributions
and will be expressed as a percentage increase or decrease from an initial value
for the entire period or for one or more specified periods within the entire
period. Total return percentages for periods of less than one year will not
usually be annualized; total return percentages for periods longer than one year
will usually be accompanied by total return percentages for each year within the
period and/or by the average annual compounded total return for the period. The
income and capital components of a given return may be separated and portrayed
in a variety of ways in order to illustrate their relative significance.
Performance may also be portrayed in terms of cash or investment values, without
percentages or by reference to historical information depicting the value of a
hypothetical account in the Trust since the Trust's inception. Past performance
cannot guarantee any particular future result.    

Average annual total return quotations for Class A and Class B shares are
computed by finding the average annual compounded rates of return that would
cause a hypothetical investment in the class made on the first day of a
designated period (assuming all dividends and distributions are reinvested) to
equal the ending redeemable value of such hypothetical investment on the last
day of the designated period in accordance with the following formula:

                           P(1+T)n[superscript] = ERV


                                       25


<PAGE>


   
Where:    P = a hypothetical initial payment of $1,000,
              less the maximum sales load of $25 for Class A shares or the
              deduction of the CDSC on Class B shares at the end of the period
    

          T = average annual total return

          n = number of years

          ERV = ending redeemable value of the hypothetical $1,000 initial
                payment made at the beginning of the designated period (or
                fractional portion thereof)

For purposes of the above computation, it is assumed that the maximum sales
charge of 2.5% was deducted from the initial investment and that all dividends
and distributions made by the Trust are reinvested at net asset value during the
designated period. The average annual total return quotation is determined to
the nearest 1/100 of 1%.

   
In determining the average annual total return (calculated as provided above),
recurring fees, if any, that are charged to all shareholder accounts of a
particular class of shares are taken into consideration. For any account fees
that vary with the size of the account, the account fee used for purposes of the
above computation is assumed to be the fee that would be charged to the class'
mean account size.

The average annual total returns for period ending November 30, 1997 were:

                         Average Annual Total Return (%)
                 1 YEAR   5 YEARS   10 YEARS   Since Inception*
                 ------   -------   --------   ---------------

Class A Shares    2.93%     4.85       N/A           4.72%
Class B Shares    2.60%      N/A       N/A           4.78%

*Inception was August 10, 1992 for Class A shares. Class B shares were first
offered April 4, 1994.    

Class A share results reflect the maximum sales charge of 2.50%. Class B share
results reflect the effect of the CDSC that would have been charged if shares
were redeemed at the end of each period. If PMC's voluntary fee and expense
reduction agreement had not been in place, total return would have been lower.

AUTOMATED INFORMATION LINE

FactFoneSM, Pioneer's 24-hour automated information line, allows shareholders to
dial toll-free 1-800-225-4321 and hear recorded fund information, including:

         o        net asset value prices for all Pioneer mutual funds;

         o        annualized 30-day yields on Pioneer's fixed-income funds;

         o        annualized 7-day yields and 7-day effective (compound) yields
                  for Pioneer's money market fund; and


                                       26


<PAGE>


         o        dividends and capital gains distributions on all Pioneer
                  mutual funds.

Yields are calculated in accordance with SEC mandated standard formulas.

   
In addition, by using a personal identification number ("PIN"), shareholders may
enter purchases, exchanges and redemptions, access their account balances and
last three transactions and may order a duplicate statement. See "FactFoneSM" in
the Prospectus for more information.

All performance numbers communicated through FactFoneSM represent past
performance andinclude the maximum applicable sales charge. A shareholder's
actual yield and total return will vary with changing market conditions. The
value of Class A and Class B shares (except for Pioneer Cash Reserves Fund,
which seeks to maintain a stable $1.00 share price) will also vary and may be
worth more or less at redemption than their original cost.    

17.      FINANCIAL STATEMENTS

   
The Trust's Annual Report, filed with the SEC on January 28, 1998 (Accession
No. 0000887228-98-000003), is incorporated by reference into this Statement of
Additional Information. The financial statements therein, including the
financial highlights, for the period ended November 30, 1997, included or
incorporated by reference into the Prospectus and this Statement of Additional
Information, have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their report with respect thereto, and are included
in reliance upon the authority of said firm as experts in accounting and
auditing in giving said report.    


                                       27


<PAGE>


   
                                   APPENDIX A

           DESCRIPTION OF SHORT-TERM DEBT AND CORPORATE BOND RATINGS1

MOODY'S INVESTORS SERVICE, INC. SHORT-TERM PRIME RATING SYSTEM - TAXABLE DEBT
AND DEPOSITS GLOBALLY

Moody's short-term debt ratings are opinions of the ability of issuers to repay
punctually senior debt obligations. These obligations have an original maturity
not exceeding one year, unless explicitly noted.

Moody's employs the following three designations, all judged to be investment
grade, to indicate the relative repayment ability of rated issuers:

PRIME-1: Issuers rated Prime-1 (or supporting institutions) have a superior
ability for repayment of senior short-term debt obligations. Prime-1 repayment
ability will often be evidenced by many of the following characteristics:

         Leading market positions in well-established industries. High rates of
         return on funds employed.
         Conservative capitalization structure 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.

PRIME-2: Issuers rated Prime-2 (or supporting institutions) have a strong
ability for repayment of senior short-term debt obligations. This will normally
be evidenced by many of the characteristics cited above but to a lesser degree.
Earnings trends and coverage ratios, while sound, may be more subject to
variation. Capitalization characteristics, while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.

PRIME-3: Issuers rated Prime-3 (or supporting institutions) have an acceptable
ability for repayment of senior short-term obligations. The effect of industry
characteristics and market compositions may be more pronounced. Variability in
earnings and profitability may result in changes in the level of debt protection
measurements and may require relatively high financial leverage. Adequate
alternate liquidity is maintained.

NOT PRIME:  Issuers rated Not Prime do not fall within any of the Prime rating
categories.

Obligations of a branch of a bank are considered to be domiciled in the country
in which the branch is located. Unless noted as an exception, Moody's rating on
a bank's ability to repay senior obligations extends only to branches located in
countries which carry a Moody's Sovereign Rating for Bank Deposits.

- --------
1 The ratings indicated herein are believed to be the most recent ratings
available at the date of this Statement of Additional Information for the
securities listed. Ratings are generally given to securities at the time of
issuance. While the rating agencies may from time to time revise such ratings,
they undertake no obligation to do so, and the ratings indicated do not
necessarily represent ratings which will be given to these securities on the
date of the Trust's fiscal year-end.


                                       28


<PAGE>


Such branch obligations are rated at the lower of the bank's rating or
Moody's Sovereign Rating for Bank Deposits for the country in which the branch
is located.

When the currency in which an obligation is denominated is not the same as the
currency of the country in which the obligation is domiciled, Moody's ratings do
not incorporate an opinion as to whether payment of the obligation will be
affected by actions of the government controlling the currency of denomination.
In addition, risks associated with bilateral conflicts between an investor's
home country and either the issuer's home country or the country where an
issuer's branch is located are not incorporated into Moody's short-term debt
ratings.

If an issuer represents to Moody's that its short-term debt obligations are
supported by the credit of another entity or entities, then the name or names of
such supporting entity or entities are listed within the parenthesis beneath the
name of the issuer, or there is a footnote referring the reader to another page
for the name or names of the supporting entity or entities. In assigning ratings
to such issuers, Moody's evaluates the financial strength of the affiliated
corporations, commercial banks, insurance companies, foreign governments or
other entities, but only as one factor in the total rating assessment.

MOODY'S CORPORATE BOND RATINGS

AAA: Bonds which are rated Aaa are judged to be of the best quality. They carry
the smallest degree of investment risk and are generally referred to as "gilt
edge." Interest payments are protected by a large or by an 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 which are rated Aa are judged to be of high quality by all standards.
Together with the Aaa group they comprise what are generally known 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 which 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
which suggest a susceptibility to impairment sometime in the future.

BAA: Bonds which are rated Baa are considered as 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 which 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.


                                       29


<PAGE>


B: Bonds which are rated B generally lack characteristics of the desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.

CAA:  Bonds which are rated Caa are of poor standing.  Such issues may be in
default or there may be present elements of danger with respect to principal or
interest.

CA:  Bonds which are rated Ca represent obligations which are speculative in a
high degree.  Such issues are often in default or have other marked
shortcomings.

C: Bonds which are rated C are the lowest rated class of bonds, and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.

NOTE: Moody's applies numerical modifiers 1, 2 and 3 in each generic rating
classification from Aa through Caa. The modifier 1 indicated that the obligation
ranks in the higher end of its generic rating category; the modifier 2 indicated
a mid-range ranking; and the modifier 3 indicates a ranking in the lower end of
that generic rating category.

STANDARD & POOR'S SHORT-TERM ISSUE CREDIT RATINGS

A-1: A short-term obligation rated A-1 is rated in the highest category by
Standard & Poor's. The obligor's capacity to meet its financial commitment on
the obligation is strong. Within this category, certain obligations are
designated with a plus sign (+). This indicates that the obligor's capacity to
meet its financial commitment on these obligations is extremely strong.

A-2: A short-term obligation rated A-2 is somewhat more susceptible to the
adverse effects of changes in circumstances and economic conditions than
obligations in higher rating categories. However, the obligor's capacity to meet
its financial commitment on the obligation is satisfactory.

A-3: A short-term obligation rated A-3 exhibits adequate protection parameters.
However, adverse economic conditions or changing circumstances are more likely
to lead to a weakened capacity of the obligor to meet its financial commitment
on the obligation.

B: A short-term obligation rated B is regarded as having significant speculative
characteristics. The obligor currently has the capacity to meet its financial
commitment on the obligation; however, it faces major ongoing uncertainties
which could lead to the obligor's inadequate capacity to meet its financial
commitment on the obligation.

C: A short-term obligation rated C is currently vulnerable to nonpayment and is
dependent upon favorable business, financial, and economic conditions for the
obligor to meet its financial commitment on the obligation.

D: A short-term obligation rated D is in payment default. The D rating category
is used when payments on an obligation are not made on the date due even if the
applicable grace period has not expired, unless Standard & Poor's believes that
such payments will be made during such grace period. The D rating also will be
used upon the filing of a bankruptcy petition or the taking of a similar action
if payments on an obligation are jeopardized.


                                       30


<PAGE>


STANDARD & POOR'S CORPORATE BOND RATINGS

AAA:  An obligation rated AAA has the highest rating assigned by Standard &
Poor's.  The obligor's capacity to meet its financial commitment on the
obligation is extremely strong.

AA:  An obligation rated AA differs from the highest-rated obligations only in a
small degree.  The obligor's capacity to meet its financial commitment on the
obligation is very strong.

A: An obligation rated A is somewhat more susceptible to the adverse effects of
changes in circumstances and economic conditions than obligations in
higher-rated categories. However, the obligor's capacity to meet its financial
commitment on the obligation is still strong.

BBB: An obligation rated BBB exhibits adequate protection parameters. However,
adverse economic conditions or changing circumstances are more likely to lead to
a weakened capacity of the obligor to meet its financial commitment on the
obligation.

Obligations rated BB, B, CCC, CC, and C are regarded as having significant
speculative characteristics. BB indicates the least degree of speculation and C
the highest. While such obligations will likely have some quality and protective
characteristics, these may be outweighed by large uncertainties or major
exposures to adverse conditions.

BB: An obligation rated BB is less vulnerable to nonpayment than other
speculative issues. However, it faces major ongoing uncertainties or exposure to
adverse business, financial or economic conditions which could lead to the
obligor's capacity to meet its financial commitment on the obligation.

B: An obligation rated B is more vulnerable to nonpayment than obligations rated
BB, but the obligor currently has the capacity to meet its financial commitment
on the obligation. Adverse business, financial, or economic conditions will
likely impair the obligor's capacity or willingness to meet its financial
commitment on the obligation.

CCC: An obligation rated CCC is currently vulnerable to nonpayment and is
dependent upon favorable business, financial and economic conditions for the
obligor to meet its financial commitment on the obligation. In the event of
adverse business, financial or economic conditions, the obligor is not likely to
have the capacity to meet its financial commitment on the obligation.

CC:  An obligation rated CC is currently highly vulnerable to nonpayment.

C: The C rating may be used to cover a situation where a bankruptcy petition has
been filed or similar action has been taken, but payments on this obligation are
being continued.

D: An obligation rated D is in payment default. The D rating category is used
when payments on an obligation are not made on the date due even if the
applicable grace period has not expired, unless Standard & Poor's believes that
such payments will be made during such grace period. The D rating also will be
used upon the filing of a bankruptcy petition or the taking of a similar action
if payments are jeopardized.


                                       31


<PAGE>


PLUS (+) OR MINUS (-): The rating from AA to CCC may be modified by the addition
of a plus or minus sign to show relative standing within the major categories.

R: This symbol is attached to the ratings of instruments with significant
noncredit risks. It highlights risks to principal or volatility of expected
returns which are not addressed in the credit rating. Examples include:
obligations linked or indexed to equities, currencies, or commodities;
obligations exposed to severe prepayment risk, such as interest-only or
principal-only mortgage securities; and obligations with unusually risky
interest terms, such as inverse floaters.    


                                       32
<PAGE>


   
                                               APPENDIX B
    


                                    PIONEER SHORT-TERM INCOME TRUST

                                             CLASS A SHARES

<TABLE>
<CAPTION>
                                                                              NET ASSET     INITIAL NET
                 INITIAL      OFFERING      SALES CHARGE        SHARES          VALUE          ASSET
    DATE        INVESTMENT      PRICE         INCLUDED         PURCHASED      PER SHARE        VALUE
<S>           <C>           <C>           <C>                <C>            <C>           <C>

   8/10/92       $10,000        $4.10          2.50%           2,439.024         4.00          $9,750

</TABLE>



                                              VALUE OF SHARES

                                   DIVIDENDS AND CAPITAL GAINS REINVESTED

<TABLE>
<CAPTION>

                      FROM INVESTMENT        FROM CAPITAL          FROM DIVIDENDS          TOTAL
        DATE                               GAINS REINVESTED          REINVESTED            VALUE
<S>                 <C>                  <C>                     <C>                     <C>

   
     12/31/92              $9,659                  $0                   $256              $9,915
     12/31/93              $9,634                  $0                   $863             $10,497
     12/31/94              $9,122                  $0                  $1,395            $10,517
     12/31/95              $9,390                  $0                  $2,190            $11,580
     12/31/96              $9,195                  $0                  $2,893            $12,088
     12/31/97              $9,196                  $0                  $3,643            $12,839
    
</TABLE>



                                       33


<PAGE>


                                    PIONEER SHORT-TERM INCOME TRUST

                                             CLASS B SHARES


<TABLE>
<CAPTION>
                                                                              NET ASSET     INITIAL NET
                 INITIAL      OFFERING      SALES CHARGE        SHARES          VALUE          ASSET
    DATE        INVESTMENT      PRICE         INCLUDED         PURCHASED      PER SHARE        VALUE
   
<S>           <C>           <C>           <C>                <C>            <C>              <C>

   4/4/94        $10,000        $3.89          2.50%           2,570.694        $3.89         $10,000
    

</TABLE>



                                              VALUE OF SHARES

                                   DIVIDENDS AND CAPITAL GAINS REINVESTED

<TABLE>
<CAPTION>
                   FROM         FROM CAPITAL     FROM DIVIDENDS   DEFERRED SALES   TOTAL VALUE      CDSC
     DATE       INVESTMENT    GAINS REINVESTED     REINVESTED         CHARGE       IF REDEEMED   PERCENTAGE
   
<S>           <C>           <C>                <C>              <C>              <C>           <C>

  12/31/94        $9,589              $0               $385            $192           $9,782         2.00%
  12/31/95        $9,897              $0              $1,021           $198           $10,720        2.00%
  12/31/96        $9,666              $0              $1,640            $97           $11,209        1.00%
  12/31/97        $9,692              $0              $2,251            $0            $11,943        0.00%
    
</TABLE>


                                       34


<PAGE>


   
                            COMPARATIVE PERFORMANCE
                               INDEX DESCRIPTIONS


The following securities indices are well known, unmanaged measures of market
performance. Advertisements and sales literature for the Trust may refer to
these indices or may present comparisons between the performance of the Trust
and one or more of the indices. Other indices may also be used, if appropriate.
The indices are not available for direct investment. The data presented are not
meant to be indicative of the performance of the Trust, do not reflect past
performance and do not guarantee future results.

S&P 500
This index is a readily available, carefully constructed, market value weighted
benchmark of common stock performance. Currently, the S&P 500 includes 500 of
the largest stocks (in terms of stock market value) in the U.S.

DOW JONES INDUSTRIAL AVERAGE
This is a total return index based on the performance of stocks of 30 blue chip
companies widely held by individuals and institutional investors. The 30 stocks
represent about a fifth of the $8 trillion-plus market value of all U.S. stocks
and about a fourth of the value of stocks listed on the New York Stock Exchange
(NYSE).

U.S. SMALL STOCK INDEX
This index is a market value weighted index of the ninth and tenth deciles of
the NYSE, plus stocks listed on the American Stock Exchange and over the counter
with the same or less capitalization as the upper bound of the NYSE ninth
decile.

U.S. INFLATION
THE CONSUMER PRICE INDEX FOR ALL URBAN CONSUMERS (CPI-U), not seasonally
adjusted, is used to measure inflation, which is the rate of change of consumer
goods prices. Unfortunately, the inflation rate as derived by the CPI is not
measured over the same period as the other asset returns. All of the security
returns are measured from one month-end to the next month-end. CPI commodity
prices are collected during the month. Thus, measured inflation rates lag the
other series by about one-half month. Prior to January 1978, the CPI (as
compared with CPI-U) was used. Both inflation measures are constructed by the
U.S. Department of Labor, Bureau of Labor Statistics, Washington, DC.

S&P/BARRA INDEXES
The S&P/BARRA GROWTH AND VALUE INDEXES are constructed by dividing the stocks in
the S&P 500 according to price-to-book ratios. The GROWTH INDEX contains stocks
with higher price-to-book ratios, and the VALUE INDEX contains stocks with lower
price-to-book ratios. Both indexes are market capitalization weighted.

MERRILL LYNCH MICRO-CAP INDEX
The MERRILL LYNCH MICRO-CAP INDEX represents the performance of 2,036 stocks
ranging in market capitalization from $50 million to $220 million. Index returns
are calculated monthly.


                                       35


<PAGE>


LONG-TERM U.S. GOVERNMENT BONDS
The total returns on long-term government bonds after 1977 are constructed with
data from The Wall Street Journal and are calculated as the change in the flat
price or and-interest price. From 1926 to 1976, data are obtained from the
government bond file at the Center for Research in Security Prices (CRSP),
Graduate School of Business, University of Chicago. Each year, a one-bond
portfolio with a term of approximately 20 years and a reasonably current coupon
was used and whose returns did not reflect potential tax benefits, impaired
negotiability or special redemption or call privileges. Where callable bonds had
to be used, the term of the bond was assumed to be a simple average of the
maturity and first call dates minus the current date. The bond was "held" for
the calendar year and returns were computed.

INTERMEDIATE-TERM U.S. GOVERNMENT BONDS
Total returns of intermediate-term government bonds after 1987 are calculated
from The Wall Street Journal prices, using the change in flat price. Returns
from 1934 to 1986 are obtained from the CRSP government bond file.

Each year, one-bond portfolios are formed, the bond chosen is the shortest
noncallable bond with a maturity not less than five years, and this bond is
"held" for the calendar year. Monthly returns are computed. (Bonds with impaired
negotiability or special redemption privileges are omitted, as are partially or
fully tax-exempt bonds starting with 1943.) From 1934 to 1942, almost all bonds
with maturities near five years were partially or fully tax-exempt and were
selected using the rules described above. Personal tax rates were generally low
in that period, so that yields on tax-exempt bonds were similar to yields on
taxable bonds. From 1926 to 1933, there are few bonds suitable for construction
of a series with a five-year maturity. For this period, five-year bond yield
estimates are used.

MORGAN STANLEY CAPITAL INTERNATIONAL ("MSCI")
MSCI's international indices are based on the share prices of approximately
1,700 companies listed on stock exchanges in the 22 countries that make up the
MSCI World Index. MSCI's emerging market indices are comprised of approximately
1000 stocks from 26 countries.

Countries in the MSCI EAFE INDEX are: Australia, Austria, Belgium, Denmark,
Finland, France, Germany, Hong Kong, Ireland, Italy, Japan, Malaysia,
Netherlands, New Zealand, Norway, Singapore, Spain, Sweden, Switzerland and
United Kingdom.

Countries in the MSCI EMERGING MARKETS FREE INDEX are: Argentina, Brazil, Chile,
China Free, Czech Republic, Colombia, Greece, Hungary, India, Indonesia Free,
Israel, Jordan, Korea (at 50%), Malaysia Free, Mexico Free, Pakistan, Peru,
Philippines Free, Poland, Portugal, South Africa, Sri Lanka, Taiwan (at 50%),
Thailand Free, Turkey and Venezuela.

6-MONTH CDS
Data sources include the Federal Reserve Bulletin and The Wall Street Journal.

LONG-TERM U.S. CORPORATE BONDS
Since 1969, corporate bond total returns are represented by the Salomon Brothers
Long-Term High-Grade Corporate Bond Index. As most large corporate bond
transactions take place over the counter, a major dealer is the natural source
of these data. The index includes nearly all Aaa- and Aa-rated bonds with at
least 10 years to maturity. If a bond is downgraded during a particular month,
its return for the month is included in the index before removing the bond from
future portfolios.



                                       36


<PAGE>


From 1926 to 1968 the total returns were calculated by summing the capital
appreciation returns and the income returns. For the period 1946 to 1968,
Ibbotson and Sinquefield backdated the Salomon Brothers' index, using Salomon
Brothers' monthly yield data with a methodology similar to that used by Salomon
Brothers for 1969 to 1995. Capital appreciation returns were calculated from
yields assuming (at the beginning of each monthly holding period) a 20-year
maturity, a bond price equal to par, and a coupon equal to the
beginning-of-period yield. For the period 1926 to 1945, Standard & Poor's
monthly high-grade corporate composite yield data were used, assuming a 4%
coupon and a 20-year maturity. The conventional present-value formula for bond
price for the beginning and end-of-month prices was used. (This formula is
presented in Ross, Stephen A., and Westerfield, Randolph W., Corporate Finance,
Times Mirror/Mosby, St. Louis, 1990, p. 97 ["Level-Coupon Bonds"].) The monthly
income return was assumed to be one-twelfth the coupon.

U.S. (30-DAY) TREASURY BILLS
For the U.S. TREASURY BILL INDEX, data from The Wall Street Journal are used
after 1977; the CRSP government bond file is the source until 1976. Each month a
one-bill portfolio containing the shortest-term bill having not less than one
month to maturity is constructed. (The bill's original term to maturity is not
relevant.) To measure holding period returns for the one-bill portfolio, the
bill is priced as of the last trading day of the previous month-end and as of
the last trading day of the current month.

NATIONAL ASSOCIATION OF REAL ESTATE INVESTMENT TRUSTS ("NAREIT")EQUITY REIT
INDEX
All of the data are based upon the last closing price of the month for all
tax-qualified REITs listed on the NYSE, AMEX and NASDAQ. The data are
market-value-weighted. Prior to 1987 REITs were added to the index the January
following their listing. Since 1987 newly formed or listed REITs are added to
the total shares outstanding figure in the month that the shares are issued.
Only common shares issued by the REIT are included in the index. The total
return calculation is based upon the weighting at the beginning of the period.
Only those REITs listed for the entire period are used in the total return
calculation. Dividends are included in the month based upon their payment date.
There is no smoothing of income. Liquidating dividends, whether full or partial,
are treated as income.

RUSSELL U.S. EQUITY INDEXES
The RUSSELL 3000(R) INDEX (the "Russell 3000") is comprised of the 3,000 largest
U.S. companies as determined by market capitalization representing approximately
98% of the U.S. equity market. The average market capitalization is
approximately $2.8 billion. The RUSSELL 2500TM INDEX measures performance of the
2,500 smallest companies in the Russell 3000. The average market capitalization
is approximately $733.4 million, and the largest company in the index has an
approximate market capitalization of $2.9 billion. The RUSSELL 2000(R) INDEX
measures performance of the 2,000 smallest stocks in the Russell 3000; the
largest company in the index has a market capitalization of approximately $1.1
billion. The RUSSELL 1000(R) INDEX (the "Russell 1000") measures the performance
of the 1,000 largest companies in the Russell 3000. The average market
capitalization is approximately $7.6 billion. The smallest company in the index
has an approximate market capitalization of $1.1 billion. The RUSSELL MIDCAPTM
INDEX measures performance of the 800 smallest companies in the Russell 1000.
The largest company in the index has an approximate market capitalization of
$8.0 billion.

The Russell indexes are reconstituted annually as of July 1, based on May 31
market capitalization rankings.


                                       37


<PAGE>


WILSHIRE REAL ESTATE SECURITIES INDEX
The WILSHIRE REAL ESTATE SECURITIES INDEX is a market capitalization weighted
index of 120 publicly traded real estate securities, such as REITs, real estate
operating companies ("REOCs") and partnerships.

The index contains performance data on five major categories of property:
office, retail, industrial, apartment and miscellaneous. The companies in the
index are 91.66% equity and hybrid REITs and 8.33% REOCs.

STANDARD & POOR'S MIDCAP 400 INDEX
The S&P 400 is a market-capitalization-weighted index. The performance data for
the index were calculated by taking the stocks presently in the index and
tracking them backwards in time as long as there were prices reported. No
attempt was made to determine what stocks "might have been" in the S&P 400 five
or ten years ago had it existed. Dividends are reinvested on a monthly basis
prior to June 30, 1991, and are reinvested daily thereafter.

LIPPER BALANCED FUNDS INDEX
This index represents equally weighted performance, adjusted for capital gains
distributions and income dividends, of approximately 30 of the largest funds
with a primary objective of conserving principal by maintaining at all times a
balanced portfolio of stocks and bonds. Typically, the stock/bond ratio ranges
around 60%/40%.

BANK SAVINGS ACCOUNT
Data sources include the U.S. League of Savings Institutions Sourcebook; average
annual yield on savings deposits in FSLIC [FDIC] insured savings institutions
for the years 1963 to 1987; and The Wall Street Journal thereafter.

Sources:  Ibbotson Associates, Towers Data Systems, Lipper Analytical Services,
Inc., Merrill Lynch and PGI    


                                       38


<PAGE>


<TABLE>
<CAPTION>

   
                  PERFORMANCE STATISTICS - TOTAL RETURN PERCENT
                               DOW                                        S&P/          S&P/
                 S&P          JONES        U.S. SMALL                    BARRA          BARRA        MERRILL LYNCH
                 500        INDUSTRIAL        STOCK         U.S.          500            500           MICRO-CAP
                             AVERAGE          INDEX       INFLATION      GROWTH         VALUE            INDEX
    
- ----------------------------------------------------------------------------------------------------------------------
   
<S>           <C>            <C>            <C>           <C>           <C>            <C>              <C>

Dec 1925         N/A           N/A             N/A           N/A          N/A            N/A              N/A
Dec 1926        11.62          N/A            0.28          -1.49         N/A            N/A              N/A
Dec 1927        37.49          N/A            22.10         -2.08         N/A            N/A              N/A
Dec 1928        43.61          55.38          39.69         -0.97         N/A            N/A              N/A
Dec 1929        -8.42         -13.64         -51.36          0.20         N/A            N/A              N/A
Dec 1930       -24.90         -30.22         -38.15         -6.03         N/A            N/A              N/A
Dec 1931       -43.34         -49.02         -49.75         -9.52         N/A            N/A              N/A
Dec 1932        -8.19         -16.88          -5.39        -10.30         N/A            N/A              N/A
Dec 1933        53.99          73.72         142.87          0.51         N/A            N/A              N/A
Dec 1934        -1.44          8.08           24.22          2.03         N/A            N/A              N/A
Dec 1935        47.67         43.77           40.19          2.99         N/A            N/A              N/A
Dec 1936        33.92         30.23           64.80          1.21         N/A            N/A              N/A
Dec 1937       -35.03        -28.88          -58.01          3.10         N/A            N/A              N/A
Dec 1938        31.12         33.16           32.80         -2.78         N/A            N/A              N/A
Dec 1939        -0.41          1.31            0.35         -0.48         N/A            N/A              N/A
Dec 1940        -9.78         -7.96           -5.16          0.96         N/A            N/A              N/A
Dec 1941       -11.59         -9.88           -9.00          9.72         N/A            N/A              N/A
Dec 1942        20.34         14.13           44.51          9.29         N/A            N/A              N/A
Dec 1943        25.90         19.06           88.37          3.16         N/A            N/A              N/A
Dec 1944        19.75         17.19           53.72          2.11         N/A            N/A              N/A
Dec 1945        36.44         31.60           73.61          2.25         N/A            N/A              N/A
Dec 1946        -8.07         -4.40          -11.63         18.16         N/A            N/A              N/A
Dec 1947         5.71          7.61            0.92          9.01         N/A            N/A              N/A
Dec 1948         5.50          4.27           -2.11          2.71         N/A            N/A              N/A
Dec 1949        18.79         20.92           19.75         -1.80         N/A            N/A              N/A
Dec 1950        31.71         26.40           38.75          5.79         N/A            N/A              N/A
Dec 1951        24.02         21.77            7.80          5.87         N/A            N/A              N/A
Dec 1952        18.37         14.58            3.03          0.88         N/A            N/A              N/A
Dec 1953        -0.99          2.02           -6.49          0.62         N/A            N/A              N/A
Dec 1954        52.62         51.25           60.58         -0.50         N/A            N/A              N/A
Dec 1955        31.56         26.58           20.44          0.37         N/A            N/A              N/A
Dec 1956         6.56          7.10            4.28          2.86         N/A            N/A              N/A
Dec 1957       -10.78         -8.63          -14.57          3.02         N/A            N/A              N/A
Dec 1958        43.36         39.31           64.89          1.76         N/A            N/A              N/A
Dec 1959        11.96         20.21           16.40          1.50         N/A            N/A              N/A
Dec 1960         0.47         -6.14           -3.29          1.48         N/A            N/A              N/A
Dec 1961        26.89         22.60           32.09          0.67         N/A            N/A              N/A
Dec 1962        -8.73         -7.43          -11.90          1.22         N/A            N/A              N/A
Dec 1963        22.80         20.83           23.57          1.65         N/A            N/A              N/A
    
</TABLE>


                                       39


<PAGE>

<TABLE>
<CAPTION>

   
                  PERFORMANCE STATISTICS - TOTAL RETURN PERCENT
                               DOW                                        S&P/          S&P/
                 S&P          JONES        U.S. SMALL                  BARRA 500        BARRA        MERRILL LYNCH
                 500        INDUSTRIAL        STOCK         U.S.         GROWTH          500           MICRO-CAP
                             AVERAGE          INDEX       INFLATION                     VALUE            INDEX
    
- ----------------------------------------------------------------------------------------------------------------------
<S>           <C>           <C>             <C>           <C>           <C>            <C>              <C>

   
Dec 1964        16.48         18.85           23.52         1.19          N/A            N/A              N/A
Dec 1965        12.45         14.39           41.75         1.92          N/A            N/A              N/A
Dec 1966       -10.06        -15.78           -7.01         3.35          N/A            N/A              N/A
Dec 1967        23.98         19.16           83.57         3.04          N/A            N/A              N/A
Dec 1968        11.06          7.93           35.97         4.72          N/A            N/A              N/A
Dec 1969        -8.50        -11.78          -25.05         6.11          N/A            N/A              N/A
Dec 1970         4.01          9.21          -17.43         5.49          N/A            N/A              N/A
Dec 1971        14.31          9.83           16.50         3.36          N/A            N/A              N/A
Dec 1972        18.98         18.48            4.43         3.41          N/A            N/A              N/A
Dec 1973       -14.66        -13.28          -30.90         8.80          N/A            N/A              N/A
Dec 1974       -26.47        -23.58          -19.95        12.20          N/A            N/A              N/A
Dec 1975        37.20         44.75           52.82         7.01         31.72          43.38             N/A
Dec 1976        23.84         22.82           57.38         4.81         13.84          34.93             N/A
Dec 1977        -7.18        -12.84           25.38         6.77        -11.82          -2.57             N/A
Dec 1978         6.56          2.79           23.46         9.03          6.78           6.16            27.76
Dec 1979        18.44         10.55           43.46        13.31         15.72          21.16            43.18
Dec 1980        32.42         22.17           39.88        12.40         39.40          23.59            32.32
Dec 1981        -4.91         -3.57           13.88         8.94         -9.81           0.02             9.18
Dec 1982        21.41         27.11           28.01         3.87         22.03          21.04            33.62
Dec 1983        22.51         25.97           39.67         3.80         16.24          28.89            42.44
Dec 1984         6.27          1.31           -6.67         3.95          2.33          10.52           -14.97
Dec 1985        32.16         33.55           24.66         3.77         33.31          29.68            22.89
Dec 1986        18.47         27.10            6.85         1.13         14.50          21.67             3.45
Dec 1987         5.23          5.48           -9.30         4.41          6.50           3.68           -13.84
Dec 1988        16.81         16.14           22.87         4.42         11.95          21.67            22.76
Dec 1989        31.49         32.19           10.18         4.65         36.40          26.13             8.06
Dec 1990        -3.17         -0.56          -21.56         6.11          0.20          -6.85           -29.55
Dec 1991        30.55         24.19           44.63         3.06         38.37          22.56            57.44
Dec 1992         7.67          7.41           23.35         2.90          5.07          10.53            36.62
Dec 1993         9.99         16.94           20.98         2.75          1.68          18.60            31.32
Dec 1994         1.31          5.06            3.11         2.67          3.13          -0.64             1.81
Dec 1995        37.43         36.84           34.46         2.54         38.13          36.99            30.70
Dec 1996        23.07         28.84           17.62         3.32         23.96          21.99            13.88
Dec 1997        33.36         24.88           22.78         1.92         36.52          29.98            24.61
    
</TABLE>


                                       40


<PAGE>


<TABLE>
<CAPTION>

   
                  PERFORMANCE STATISTICS - TOTAL RETURN PERCENT
                  LONG-       INTERMEDIATE-      MSCI                      LONG-
                  TERM          TERM U.S.        EAFE         6-         TERM U.S.          U.S.
               U.S. GOV'T      GOVERNMENT       (Net of      MONTH       CORPORATE         T-BILL
                  BONDS           BONDS         Taxes)        CDS          BONDS          (30-Day)
    
- ------------------------------------------------------------------------------------------------------
<S>             <C>             <C>             <C>         <C>           <C>             <C>

   
Dec 1925           N/A             N/A            N/A         N/A           N/A             N/A
Dec 1926          7.77            5.38            N/A         N/A           7.37            3.27
Dec 1927          8.93            4.52            N/A         N/A           7.44            3.12
Dec 1928          0.10            0.92            N/A         N/A           2.84            3.56
Dec 1929          3.42            6.01            N/A         N/A           3.27            4.75
Dec 1930          4.66            6.72            N/A         N/A           7.98            2.41
Dec 1931         -5.31           -2.32            N/A         N/A          -1.85            1.07
Dec 1932         16.84            8.81            N/A         N/A          10.82            0.96
Dec 1933         -0.07            1.83            N/A         N/A          10.38            0.30
Dec 1934         10.03            9.00            N/A         N/A          13.84            0.16
Dec 1935          4.98            7.01            N/A         N/A           9.61            0.17
Dec 1936          7.52            3.06            N/A         N/A           6.74            0.18
Dec 1937          0.23            1.56            N/A         N/A           2.75            0.31
Dec 1938          5.53            6.23            N/A         N/A           6.13           -0.02
Dec 1939          5.94            4.52            N/A         N/A           3.97            0.02
Dec 1940          6.09            2.96            N/A         N/A           3.39            0.00
Dec 1941          0.93            0.50            N/A         N/A           2.73            0.06
Dec 1942          3.22            1.94            N/A         N/A           2.60            0.27
Dec 1943          2.08            2.81            N/A         N/A           2.83            0.35
Dec 1944          2.81            1.80            N/A         N/A           4.73            0.33
Dec 1945         10.73            2.22            N/A         N/A           4.08            0.33
Dec 1946         -0.10            1.00            N/A         N/A           1.72            0.35
Dec 1947         -2.62            0.91            N/A         N/A          -2.34            0.50
Dec 1948          3.40            1.85            N/A         N/A           4.14            0.81
Dec 1949          6.45            2.32            N/A         N/A           3.31            1.10
Dec 1950          0.06            0.70            N/A         N/A           2.12            1.20
Dec 1951         -3.93            0.36            N/A         N/A          -2.69            1.49
Dec 1952          1.16            1.63            N/A         N/A           3.52            1.66
Dec 1953          3.64            3.23            N/A         N/A           3.41            1.82
Dec 1954          7.19            2.68            N/A         N/A           5.39            0.86
Dec 1955         -1.29           -0.65            N/A         N/A           0.48            1.57
Dec 1956         -5.59           -0.42            N/A         N/A          -6.81            2.46
Dec 1957          7.46            7.84            N/A         N/A           8.71            3.14
Dec 1958         -6.09           -1.29            N/A         N/A          -2.22            1.54
Dec 1959         -2.26           -0.39            N/A         N/A          -0.97            2.95
Dec 1960         13.78           11.76            N/A         N/A           9.07            2.66
    
</TABLE>


                                       41


<PAGE>


<TABLE>
<CAPTION>
   
                  PERFORMANCE STATISTICS - TOTAL RETURN PERCENT
                  LONG-       INTERMEDIATE-      MSCI                      LONG-
                  TERM          TERM U.S.        EAFE         6-         TERM U.S.          U.S.
               U.S. GOV'T      GOVERNMENT       (Net of      MONTH       CORPORATE         T-BILL
                  BONDS           BONDS         Taxes)        CDS          BONDS          (30-Day)
    
- ------------------------------------------------------------------------------------------------------
<S>             <C>             <C>             <C>         <C>           <C>             <C>

   
Dec 1961          0.97            1.85            N/A         N/A           4.82            2.13
Dec 1962          6.89            5.56            N/A         N/A           7.95            2.73
Dec 1963          1.21            1.64            N/A         N/A           2.19            3.12
Dec 1964          3.51            4.04            N/A        4.17           4.77            3.54
Dec 1965          0.71            1.02            N/A        4.68          -0.46            3.93
Dec 1966          3.65            4.69            N/A        5.76           0.20            4.76
Dec 1967         -9.18            1.01            N/A        5.47          -4.95            4.21
Dec 1968         -0.26            4.54            N/A        6.45           2.57            5.21
Dec 1969         -5.07           -0.74            N/A        8.70          -8.09            6.58
Dec 1970         12.11           16.86          -11.66       7.06          18.37            6.52
Dec 1971         13.23            8.72           29.59       5.36          11.01            4.39
Dec 1972          5.69            5.16           36.35       5.39           7.26            3.84
Dec 1973         -1.11            4.61          -14.92       8.60           1.14            6.93
Dec 1974          4.35            5.69          -23.16      10.20          -3.06            8.00
Dec 1975          9.20            7.83           35.39       6.51          14.64            5.80
Dec 1976         16.75           12.87            2.54       5.22          18.65            5.08
Dec 1977         -0.69            1.41           18.06       6.11           1.71            5.12
Dec 1978         -1.18            3.49           32.62      10.21          -0.07            7.18
Dec 1979         -1.23            4.09            4.75      11.90          -4.18           10.38
Dec 1980         -3.95            3.91           22.58      12.33          -2.76           11.24
Dec 1981          1.86            9.45           -2.28      15.50          -1.24           14.71
Dec 1982         40.36           29.10           -1.86      12.18          42.56           10.54
Dec 1983          0.65            7.41           23.69       9.65           6.26            8.80
Dec 1984         15.48           14.02            7.38      10.65          16.86            9.85
Dec 1985         30.97           20.33           56.16       7.82          30.09            7.72
Dec 1986         24.53           15.14           69.44       6.30          19.85            6.16
Dec 1987         -2.71            2.90           24.63       6.59          -0.27            5.47
Dec 1988          9.67            6.10           28.27       8.15          10.70            6.35
Dec 1989         18.11           13.29           10.54       8.27          16.23            8.37
Dec 1990          6.18            9.73          -23.45       7.85           6.78            7.81
Dec 1991         19.30           15.46           12.13       4.95          19.89            5.60
Dec 1992          8.05            7.19          -12.17       3.27           9.39            3.51
Dec 1993         18.24           11.24           32.56       2.88          13.19            2.90
Dec 1994         -7.77           -5.14            7.78       5.40          -5.76            3.90
Dec 1995         31.67           16.80           11.21       5.21          27.20            5.60
Dec 1996         -0.93            2.10            6.05       5.21           1.40            5.21
Dec 1997         15.85            8.38            1.78       5.71          12.95            5.26
    
</TABLE>


                                       42


<PAGE>


<TABLE>
<CAPTION>

   
                  PERFORMANCE STATISTICS - TOTAL RETURN PERCENT
                 NAREIT                                                   LIPPER           MSCI
                 EQUITY       RUSSELL       WILSHIRE                     BALANCED        EMERGING           BANK
                  REIT         2000       REAL ESTATE        S&P           FUND          MARKETS          SAVINGS
                 INDEX         INDEX       SECURITIES        400           INDEX        FREE INDEX        ACCOUNT
    
- -----------------------------------------------------------------------------------------------------------------------
   
<S>             <C>           <C>           <C>            <C>            <C>            <C>              <C>

Dec 1925          N/A           N/A           N/A            N/A            N/A            N/A              N/A
Dec 1926          N/A           N/A           N/A            N/A            N/A            N/A              N/A
Dec 1927          N/A           N/A           N/A            N/A            N/A            N/A              N/A
Dec 1928          N/A           N/A           N/A            N/A            N/A            N/A              N/A
Dec 1929          N/A           N/A           N/A            N/A            N/A            N/A              N/A
Dec 1930          N/A           N/A           N/A            N/A            N/A            N/A              5.30
Dec 1931          N/A           N/A           N/A            N/A            N/A            N/A              5.10
Dec 1932          N/A           N/A           N/A            N/A            N/A            N/A              4.10
Dec 1933          N/A           N/A           N/A            N/A            N/A            N/A              3.40
Dec 1934          N/A           N/A           N/A            N/A            N/A            N/A              3.50
Dec 1935          N/A           N/A           N/A            N/A            N/A            N/A              3.10
Dec 1936          N/A           N/A           N/A            N/A            N/A            N/A              3.20
Dec 1937          N/A           N/A           N/A            N/A            N/A            N/A              3.50
Dec 1938          N/A           N/A           N/A            N/A            N/A            N/A              3.50
Dec 1939          N/A           N/A           N/A            N/A            N/A            N/A              3.40
Dec 1940          N/A           N/A           N/A            N/A            N/A            N/A              3.30
Dec 1941          N/A           N/A           N/A            N/A            N/A            N/A              3.10
Dec 1942          N/A           N/A           N/A            N/A            N/A            N/A              3.00
Dec 1943          N/A           N/A           N/A            N/A            N/A            N/A              2.90
Dec 1944          N/A           N/A           N/A            N/A            N/A            N/A              2.80
Dec 1945          N/A           N/A           N/A            N/A            N/A            N/A              2.50
Dec 1946          N/A           N/A           N/A            N/A            N/A            N/A              2.20
Dec 1947          N/A           N/A           N/A            N/A            N/A            N/A              2.30
Dec 1948          N/A           N/A           N/A            N/A            N/A            N/A              2.30
Dec 1949          N/A           N/A           N/A            N/A            N/A            N/A              2.40
Dec 1950          N/A           N/A           N/A            N/A            N/A            N/A              2.50
Dec 1951          N/A           N/A           N/A            N/A            N/A            N/A              2.60
Dec 1952          N/A           N/A           N/A            N/A            N/A            N/A              2.70
Dec 1953          N/A           N/A           N/A            N/A            N/A            N/A              2.80
Dec 1954          N/A           N/A           N/A            N/A            N/A            N/A              2.90
Dec 1955          N/A           N/A           N/A            N/A            N/A            N/A              2.90
Dec 1956          N/A           N/A           N/A            N/A            N/A            N/A              3.00
Dec 1957          N/A           N/A           N/A            N/A            N/A            N/A              3.30
Dec 1958          N/A           N/A           N/A            N/A            N/A            N/A              3.38
Dec 1959          N/A           N/A           N/A            N/A            N/A            N/A              3.53
Dec 1960          N/A           N/A           N/A            N/A            5.77           N/A              3.86
Dec 1961          N/A           N/A           N/A            N/A           20.59           N/A              3.90
    
</TABLE>


                                       43


<PAGE>


<TABLE>
<CAPTION>

   
                  PERFORMANCE STATISTICS - TOTAL RETURN PERCENT
                 NAREIT                                                   LIPPER           MSCI
                 EQUITY       RUSSELL       WILSHIRE                     BALANCED        EMERGING           BANK
                  REIT         2000       REAL ESTATE        S&P           FUND          MARKETS          SAVINGS
                 INDEX         INDEX       SECURITIES        400           INDEX        FREE INDEX        ACCOUNT
    
- -----------------------------------------------------------------------------------------------------------------------
   
<S>             <C>           <C>           <C>            <C>           <C>             <C>              <C>

Dec 1962          N/A           N/A           N/A            N/A           -6.80           N/A              4.08
Dec 1963          N/A           N/A           N/A            N/A           13.10           N/A              4.17
Dec 1964          N/A           N/A           N/A            N/A           12.36           N/A              4.19
Dec 1965          N/A           N/A           N/A            N/A            9.80           N/A              4.23
Dec 1966          N/A           N/A           N/A            N/A           -5.86           N/A              4.45
Dec 1967          N/A           N/A           N/A            N/A           15.09           N/A              4.67
Dec 1968          N/A           N/A           N/A            N/A           13.97           N/A              4.68
Dec 1969          N/A           N/A           N/A            N/A           -9.01           N/A              4.80
Dec 1970          N/A           N/A           N/A            N/A            5.62           N/A              5.14
Dec 1971          N/A           N/A           N/A            N/A           13.90           N/A              5.30
Dec 1972          8.01          N/A           N/A            N/A           11.13           N/A              5.37
Dec 1973        -15.52          N/A           N/A            N/A          -12.24           N/A              5.51
Dec 1974        -21.40          N/A           N/A            N/A          -18.71           N/A              5.96
Dec 1975         19.30          N/A           N/A            N/A           27.10           N/A              6.21
Dec 1976         47.59          N/A           N/A            N/A           26.03           N/A              6.23
Dec 1977         22.42          N/A           N/A            N/A           -0.72           N/A              6.39
Dec 1978         10.34          N/A          13.04           N/A            4.80           N/A              6.56
Dec 1979         35.86         43.09         70.81           N/A           14.67           N/A              7.29
Dec 1980         24.37         38.58         22.08           N/A           19.70           N/A              8.78
Dec 1981          6.00          2.03          7.18           N/A            1.86           N/A             10.71
Dec 1982         21.60         24.95         24.47          22.68          30.63           N/A             11.19
Dec 1983         30.64         29.13         27.61          26.10          17.44           N/A              9.71
Dec 1984         20.93         -7.30         20.64           1.18           7.46           N/A              9.92
Dec 1985         19.10         31.05         22.20          35.58          29.83           N/A              9.02
Dec 1986         19.16          5.68         20.30          16.21          18.43           N/A              7.84
Dec 1987         -3.64         -8.77         -7.86          -2.03           4.13           N/A              6.92
Dec 1988         13.49         24.89         24.18          20.87          11.18          40.43             7.20
Dec 1989          8.84         16.24          2.37          35.54          19.70          64.96             7.91
Dec 1990        -15.35        -19.51        -33.46          -5.12           0.66         -10.55             7.80
Dec 1991         35.70         46.05         20.03          50.10          25.83          59.91             4.61
Dec 1992         14.59         18.41          7.36          11.91           7.46          11.40             2.89
Dec 1993         19.65         18.91         15.24          13.96          11.95          74.83             2.73
Dec 1994          3.17         -1.82          1.64          -3.57          -2.05          -7.32             4.96
Dec 1995         15.27         28.44         13.65          30.94          24.89          -5.21             5.24
Dec 1996         35.26         16.53         36.87          19.20          13.01           6.03             4.95
Dec 1997         20.29         22.36         19.80          32.26          20.05          -11.59            5.17
    
</TABLE>


                                       44


<PAGE>


   
                                   APPENDIX C

                            OTHER PIONEER INFORMATION

The Pioneer group of mutual funds was established in 1928 with the creation of
Pioneer Fund. Pioneer is one of the oldest and most experienced money managers
in the United States.

As of December 31, 1997, PMC employed a professional investment staff of 58,
with a combined average of 12 years' experience in the financial services
industry.

Total assets of all Pioneer mutual funds at December 31, 1997, were
approximately $19.8 billion representing 1,177,148 shareholder accounts, 791,468
non-retirement accounts and 385,680 retirement accounts.

g:\edgar\sai\current\stit398.doc    


                                       45


<PAGE>


   

                                     PART C

                              OTHER INFORMATION    


Item 24.  Financial Statements and Exhibits

         (a) Financial Statements:

   
             The financial highlights of the Registrant for the fiscal year
             ended November 30, 1997 are included in Part A of the Registration
             Statement and the financial statements of the Registrant for the
             fiscal year ended November 30, 1997 are part of the 1997 Annual
             Report to Shareholders (filed electronically on January 28, 1998;
             File No. 811-06657; Accession No. 0000887228-98-000003) which is
             incorporated by reference into Part B of the Registration
             Statement.    

         (b) Exhibits:

             1.1      Declaration of Trust*

             1.2      Establishment and Designation of Classes*

             2.       By-Laws*

             3.       None

             4.       Specimen Stock Certificate*

             5.       Form of Management Contract*

             6.1      Form of Underwriting Agreement*

             6.2      Form of Dealer Sales Agreement*

             7.       None

             8.       Form of Custodian Agreement*


                                      C-1


<PAGE>


             9.       Form of Investment Company Service Agreement*

   
             10.      None    

             11.      Consent of Independent Public Accountants.+

             12.      None

             13.      Stock Purchase Agreement*

             14.      None

             15.1     Amended Form of Distribution Plan*

             15.2     Form of Class B Rule 12b-1 Distribution Plan*

             16.1     Schedule of Computation of Total Return*

             16.2     Schedule of Computation of Yield*

   
             17.      Financial Data Schedules.+

             18.1     Rule 18f-3 Plan Coverning Two Classes of Shares
                      pursuant to Rule 18f-3.**

             19.      Powers of Attorney*

             19.1     Power of Attorney for Mary K. Bush.+    

- ------------------------
   
     +Filed herewith.

     *Previously filed. Incorporated herein by reference from the exhibits filed
with Post-Effective Amendment No. 3 to the Registrant's Registration Statement
(File No. 33-47613) as filed with the Securities and Exchange Commission (the
"SEC") on March 29, 1995 (Accession No. 0000887228-95-000011).

     **Previously filed. Incorporated herein by reference from the exhibit
filed with Post-Effective Amendment No. 5 to the Registration Statement as filed
with the SEC on March 27, 1997 (Accession No. 0000950146-97-000440).    

Item 25.  Persons Controlled by or Under Common Control with Registrant

   
         No person is controlled by the Registrant. A common control
relationship could exist from a management perspective because the Chairman and
President of the Registrant owns approximately 14% of the outstanding shares of


                                      C-2


<PAGE>


The Pioneer Group, Inc. (PGI), the parent company of the Registrant's investment
adviser, and certain Trustees or officers of the Registrant (i) hold similar
positions with other investment companies advised by PGI and (ii) are directors
or officers of PGI and/or its direct or indirect subsidiaries. The following
lists all U.S. and the principal non-U.S. subsidiaries of PGI and those
registered investment companies with a common or similar Board of Trustees
advised by PGI.

                                           OWNED   PERCENT    STATE/COUNTRY OF
                COMPANY                     BY    OF SHARES    INCORPORATION
Pioneering Management Corp. (PMC)           PGI     100%          DE
Pioneer Funds Distributor, Inc. (PFD)       PMC     100%          MA
Pioneer Explorer, Inc. (PEI)                PMC     100%          DE
Pioneer Fonds Marketing GmbH (GmbH)         PFD     100%          Germany
Pioneer Forest, Inc. (PFI)                  PGI     100%          DE
CJSC "Forest-Starma" (Forest-Starma)        PFI     95%           Russia
Pioneer Metals and Technology, Inc. (PMT)   PGI     100%          DE
Pioneer Capital Corp. (PCC)                 PGI     100%          DE
Pioneer SBIC Corp.                          PCC     100%          MA
Pioneer Real Estate Advisors, Inc. (PREA)   PGI     100%          DE
Pioneer Management (Ireland) Ltd. (PMIL)    PGI     100%          Ireland
Pioneer Plans Corporation (PPC)             PGI     100%          DE
PIOGlobal Corp. (PIOGlobal)                 PGI     100%          DE
Pioneer Investments Corp. (PIC)             PGI     100%          MA
Pioneer Goldfields Holdings, Inc. (PGH)     PGI     100%          DE
Pioneer Goldfields Ltd. (PGL)               PGH     100%          Guernsey
Teberebie Goldfields Ltd. (TGL)             PGL     90%           Ghana
Pioneer Omega, Inc. (Omega)                 PGI     100%          DE
Pioneer First Russia, Inc. (First Russia)   Omega   81.65%        DE
Pioneering Services Corp. (PSC)             PGI     100%          MA
Pioneer International Corp. (PIntl)         PGI     100%          DE
Pioneer First Polish Trust Fund JSC, S.A.
(First Polish)                              PIntl   100%          Poland
Pioneer Czech Investment Company, A.S.
(Pioneer Czech)                             PIntl   100%          Czech Republic

Registered investment companies that are parties to management contracts with
PMC:

FUNDS                                               BUSINESS TRUST
Pioneer International Growth Fund                   MA
Pioneer World Equity Fund                           DE
Pioneer Europe Fund                                 MA
Pioneer Emerging Markets Fund                       DE
Pioneer India Fund                                  DE


                                      C-3


<PAGE>


Pioneer Growth Trust                                MA
Pioneer Mid-Cap Fund                                DE
Pioneer Growth Shares                               DE
Pioneer Small Company Fund                          DE
Pioneer Independence Fund                           DE
Pioneer Fund                                        DE
Pioneer II                                          DE
Pioneer Real Estate Shares                          DE
Pioneer Short-Term Income Trust                     MA
Pioneer America Income Trust                        MA
Pioneer Bond Fund                                   MA
Pioneer Balanced Fund                               DE
Pioneer Intermediate Tax-Free Fund                  MA
Pioneer Tax-Free Income Fund                        DE
Pioneer Money Market Trust                          DE
Pioneer Variable Contracts Trust                    DE
Pioneer Interest Shares                             DE
Pioneer Micro-Cap Fund                              DE

         The following table lists John F. Cogan, Jr.'s positions with the
investment companies, PGI and principal direct or indirect PGI subsidiaries
referenced above and the Registrant's counsel.

                                              TRUSTEE/
         ENTITY        CHAIRMAN   PRESIDENT   DIRECTOR   OTHER

Pioneer mutual
funds                     X           X          X
PGL                       X           X          X
PGI                       X           X          X
PPC                                   X          X
PIC                                   X          X
PIntl                                 X          X
PMT                                   X          X
Omega                                 X          X
PIOGlobal                             X          X
First Russia                          X          X
PCC                                              X
PSC                                              X
PMIL                                             X
PEI                                              X
PFI                                              X
PREA                                             X
Forest-Starma                                    X
PMC                       X                      X
PFD                       X                      X
TGL                       X                      X


                                      C-4



<PAGE>


First Polish                                             Chairman of Supervisory
                                                         Board
GmbH                                                     Chairman of Supervisory
                                                         Board
Pioneer Czech                                            Chairman of Supervisory
                                                         Board
Hale and Dorr LLP                                        Partner    

Item 26.  Number of Holders of Securities

   
                        (1)
                  Title of Class                         (2)
           Shares of Beneficial Interest       Number of Record Holders
                (without par value)             as of February 28, 1998
           Class A shares                               2,261
           Class B shares                                 311    

Item 27.  Indemnification

   
         Except for the Declaration of Trust (the "Declaration"),
dated April 30, 1992, establishing the Registrant as a business trust under
Massachusetts law, there is no contract, arrangement or statute under which any
Trustee, officer, underwriter or affiliated person of the Registrant is insured
or indemnified. The Declaration provides that no Trustee or officer will be
indemnified against any liability to which the Registrant would otherwise be
subject by reason of or for willful misfeasance, bad faith, gross negligence or
reckless disregard of such person's duties.

         Insofar as indemnification for liability arising under the Securities
Act of 1933, as amended (the "1933 Act"), may be available to Trustees, officers
and controlling persons of the Registrant pursuant to the foregoing provisions,
or otherwise, the Registrant has been advised that in the opinion of the SEC
such indemnification is against public policy as expressed in the 1933 Act and
is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a Trustee, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
Trustee, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the 1933 Act and will be governed by the final
adjudication of such issue.    

Item 28.  Business and Other Connections of Investment Adviser

   
         All of the information required by this item is set forth in the Form
ADV, as amended, of PMC, the Registrant's investment adviser. The following
sections of such Form ADV are incorporated herein by reference:

         (a)      Items 1 and 2 of Part 2; and

         (b)      Section 6, Business Background, of each Schedule D.

Item 29.  Principal Underwriters    

         (a)      See Item 25 above.

         (b)      Directors and officers of PFD:

                                      C-5


<PAGE>


                       POSITIONS AND OFFICES WITH   POSITIONS AND OFFICES WITH
       NAME            UNDERWRITER                  REGISTRANT

John F. Cogan, Jr.     Director and Chairman        Chairman of the Board,
                                                    President and Trustee

Robert L. Butler       Director and President       None

David D. Tripple       Director                     Executive Vice President and
                                                    Trustee

Steven M. Graziano     Senior Vice President        None

Stephen W. Long        Senior Vice President        None
       
Barry G. Knight        Vice President               None

William A. Misata      Vice President               None

Anne W. Patenaude      Vice President               None

Elizabeth B. Bennett   Vice President               None

Gail A. Smyth          Vice President               None

Constance D. Spiros    Vice President               None

Marcy L. Supovitz      Vice President               None

Mary Kleeman           Vice President               None

Steven R. Berke        Assistant Vice President     None

   
Steven H. Forss        Assistant Vice President     None    

Mary Sue Hoban         Assistant Vice President     None

   
Debra A. Levine        Assistant Vice President     None

Junior Roy McFarland   Assistant Vice President     None

Marie E. Moynihan      Assistant Vice President     None    

William H. Keough      Treasurer                    Treasurer

Roy P. Rossi           Assistant Treasurer          None

Joseph P. Barri        Clerk                        Secretary

Robert P. Nault        Assistant Clerk              Assistant Secretary

   
The principal business address of each of these individuals is 60 State Street,
Boston, Massachusetts 02109-1820.    

         (c)      Not applicable.


                                      C-6


<PAGE>


Item 30.  Location of Accounts and Records

         The accounts and records are maintained at the Registrant's office at
60 State Street, Boston, Massachusetts; contact the Treasurer.

Item 31.  Management Services

   
         Not applicable.    

Item 32.  Undertakings

   
         (a) Not applicable.    

   
         (b) Not applicable.    

   
         (c) The Registrant undertakes to deliver or cause to be delivered with
             the Prospectus, to each person to whom the Prospectus is sent or
             given, a copy of the Registrant's report to shareholders furnished
             pursuant to and meeting the requirements of Rule 30d-1 under the
             Investment Company Act of 1940, as amended, from which the
             specified information is incorporated by reference, unless such
             person currently holds securities of the Registrant and otherwise
             has received a copy of such report, in which case the Registrant
             shall state in the Prospectus that it will furnish, without charge,
             a copy of such report on request, and the name, address and
             telephone number of the person to whom such a request should be
             directed.    


                                      C-7


<PAGE>


                                   SIGNATURES


   
         Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Post-Effective Amendment No. 6 to its
Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933
and has duly caused this Post-Effective Amendment No. 6 to its Registration
Statement to be signed on its behalf by the undersigned, thereto duly
authorized, in the City of Boston and Commonwealth of Massachusetts, on the 30th
day of March, 1998.    
                                       PIONEER SHORT-TERM INCOME TRUST



   
                                       By:  /s/ Joseph P. Barri
                                            Joseph P. Barri
                                            Secretary    

   
         Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No. 6 to the Registrant's Registration Statement has
been signed below by the following persons in the capacities and on the date
indicated:    

Signature                      Title

   
John F. Cogan, Jr.*            Chairman of the Board              )
John F. Cogan, Jr.             and President                      )
                               (Principal Executive               )
                               Officer)                           )
                                                                  )
                                                                  )
/s/ William H. Keough          Chief Financial Officer            )
William H. Keough              and Treasurer (Principal           )
                               Financial and Accounting           )
                               Officer)                           )
                                                                  )
                                                                  )
Trustees:                                                         )
                                                                  )
                                                                  )
Mary K. Bush*                                                     )
Mary K. Bush                                                      )
                                                                  )
                                                                  )
John F. Cogan, Jr.*                                               )
John F. Cogan, Jr.                                                )
                                                                  )
                                                                  )
Richard H. Egdahl, M.D.*                                          )
Richard H. Egdahl, M.D.                                           )


<PAGE>


                                                                  )
                                                                  )
Margaret B. W. Graham*                                            )
Margaret B. W. Graham                                             )
                                                                  )
                                                                  )
John W. Kendrick*                                                 )
John W. Kendrick                                                  )
                                                                  )
                                                                  )
Marguerite A. Piret*                                              )
Marguerite A. Piret                                               )
                                                                  )
                                                                  )
David D. Tripple*                                                 )
David D. Tripple                                                  )
                                                                  )
                                                                  )
Stephen K. West*                                                  )
Stephen K. West                                                   )
                                                                  )
                                                                  )
John Winthrop*                                                    )
John Winthrop                                                     )
                                                                  )
                                                                  )
*By:     /s/ Joseph P. Barri                Dated:  March 30, 1998)
         Joseph P. Barri
         Attorney-in-fact    


<PAGE>


                                  Exhibit Index


Exhibit
Number            Document Title

11.               Consent of Independent Public Accountants

17.               Financial Data Schedules

19.1              Power of Attorney for Mary K. Bush







                              ARTHUR ANDERSEN LLP





                    Consent of Independent Public Accountants



As independent public accountants, we hereby consent to the incorporation
by reference in this registration of our report dated January 5, 1998 
for Pioneer Short-Term Income Trust and to all references to our firm included
in or made a part of Post-Effective Amendment No. 6 and Amendment No. 7 to
registration statement file Nos. 33-47613 and 811-06657, respectively.



/s/ Arthur Andersen LLP
Boston, Massachusetts
March 26, 1998



<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL DATA EXTRACTED FROM THE ANNUAL REPORT
ON FORM N-SAR DATED NOVEMBER 30, 1997 FOR PIONEER SHORT-TERM INCOME TRUST AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000887228
<NAME> PIONEER SHORT-TERM INCOME TRUST
<SERIES>
   <NUMBER> 001
   <NAME> PIONEER SHORT-TERM INCOME TRUST CLASS A
<MULTIPLIER> 1,000
       
<S>                                     <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          NOV-30-1997
<PERIOD-END>                               NOV-30-1997
<INVESTMENTS-AT-COST>                         46632382
<INVESTMENTS-AT-VALUE>                        46575845
<RECEIVABLES>                                   823117
<ASSETS-OTHER>                                    4406
<OTHER-ITEMS-ASSETS>                               764
<TOTAL-ASSETS>                                47404132
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       158506
<TOTAL-LIABILITIES>                             158506
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      50669174
<SHARES-COMMON-STOCK>                         11150229
<SHARES-COMMON-PRIOR>                         14398261
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           10351
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       3356660
<ACCUM-APPREC-OR-DEPREC>                       (56537)
<NET-ASSETS>                                  47245626
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              3538771
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  469802
<NET-INVESTMENT-INCOME>                        3068969
<REALIZED-GAINS-CURRENT>                      (315856)
<APPREC-INCREASE-CURRENT>                      (88164)
<NET-CHANGE-FROM-OPS>                          2664949
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      2774220
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        6898656
<NUMBER-OF-SHARES-REDEEMED>                   10708837
<SHARES-REINVESTED>                             562149
<NET-CHANGE-IN-ASSETS>                      (12359796)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                          48615
<OVERDIST-NET-GAINS-PRIOR>                     3056577
<GROSS-ADVISORY-FEES>                           253266
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 770505
<AVERAGE-NET-ASSETS>                          45908787
<PER-SHARE-NAV-BEGIN>                             3.79
<PER-SHARE-NII>                                    .21
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                               .23
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               3.77
<EXPENSE-RATIO>                                    .87
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL DATA EXTRACTED FROM THE ANNUAL REPORT
ON FORM N-SAR DATED NOVEMBER 30, 1997 FOR PIONEER SHORT-TERM INCOME TRUST AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK>     0000887228
<NAME>    PIONEER SHORT-TERM INCOME TRUST
<SERIES>
   <NUMBER>    002
   <NAME>      PIONEER SHORT-TERM INCOME TRUST CLASS B
<MULTIPLIER> 1,000
       
<S>                                     <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                           NOV-30-1997
<PERIOD-END>                                NOV-30-1997
<INVESTMENTS-AT-COST>                         46632382
<INVESTMENTS-AT-VALUE>                        46575845
<RECEIVABLES>                                   823117
<ASSETS-OTHER>                                    4406
<OTHER-ITEMS-ASSETS>                               764
<TOTAL-ASSETS>                                47404132
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       158506
<TOTAL-LIABILITIES>                             158506
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      50669174
<SHARES-COMMON-STOCK>                          1377961
<SHARES-COMMON-PRIOR>                          1311811
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           10351
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       3356660
<ACCUM-APPREC-OR-DEPREC>                       (56537)
<NET-ASSETS>                                  47245626
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              3538771
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  469802
<NET-INVESTMENT-INCOME>                        3068969
<REALIZED-GAINS-CURRENT>                      (315856)
<APPREC-INCREASE-CURRENT>                      (88164)
<NET-CHANGE-FROM-OPS>                          2664949
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       257396
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        2657915
<NUMBER-OF-SHARES-REDEEMED>                    2638370
<SHARES-REINVESTED>                              46605
<NET-CHANGE-IN-ASSETS>                      (12359796)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                          48615
<OVERDIST-NET-GAINS-PRIOR>                     3056577
<GROSS-ADVISORY-FEES>                           253266
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 770505
<AVERAGE-NET-ASSETS>                           4849257
<PER-SHARE-NAV-BEGIN>                             3.79
<PER-SHARE-NII>                                    .20
<PER-SHARE-GAIN-APPREC>                          (.03)
<PER-SHARE-DIVIDEND>                               .20
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               3.76
<EXPENSE-RATIO>                                   1.67
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>



                          PIONEER EMERGING MARKETS FUND
                               PIONEER EUROPE FUND
                              PIONEER GROWTH TRUST
                               PIONEER INDIA FUND
                        PIONEER INTERNATIONAL GROWTH FUND
                            PIONEER WORLD EQUITY FUND
                              PIONEER GROWTH SHARES
                              PIONEER MID-CAP FUND
                           PIONEER SMALL COMPANY FUND
                             PIONEER MICRO-CAP FUND
                              PIONEER BALANCED FUND
                                  PIONEER FUND
                                   PIONEER II
                           PIONEER REAL ESTATE SHARES
                          PIONEER AMERICA INCOME TRUST
                                PIONEER BOND FUND
                         PIONEER SHORT TERM INCOME TRUST
                       PIONEER INTERMEDIATE TAX-FREE FUND
                           PIONEER MONEY MARKET TRUST


                                POWER OF ATTORNEY

                              Dated October 7, 1997

     I, the undersigned Trustee of each of the above-listed registered
investment companies (each a "Fund"), each a Delaware or a Massachusetts
business trust, do hereby constitute and appoint John F. Cogan, Jr., David D.
Tripple, and Joseph P. Barri, and each of them acting singly, to be my true,
sufficient and lawful attorneys, with full power to each of them, and each of
them acting singly, to sign for me, in my name and in my capacity as trustee,
any and all amendments to the Registration Statement on Form N-1A to be filed by
each Fund under the Investment Company Act of 1940, as amended (the "1940 Act"),
and under the Securities Act of 1933, as amended (the "1933 Act"), with respect
to the offering of its shares of beneficial interest and any and all other
documents and papers relating thereto, and generally to do all such things in my
name and on my behalf in my capacity as trustee to enable each Fund to comply
with the 1940 Act and the 1933 Act, and all requirements of the Securities and
Exchange Commission thereunder, hereby ratifying and confirming my signature as
it may be signed by said attorneys or each of them to any and all amendments to
said Registration Statement.

     IN WITNESS WHEREOF, I have hereunder set my hand on this Instrument as
of the date first written above.



                                                /s/ Mary K. Bush

                                                Mary K. Bush, Trustee




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