CALVERT TAX FREE RESERVES
485APOS, 1999-01-14
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SEC Registration Nos.
2-69565 and 811-3101

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-1A

REGISTRATION STATEMENT UNDER THE
SECURITIES ACT OF 1933

Post-Effective Amendment No. 46             XX

                                     and/or

REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940

Amendment No. 46                            XX

                           Calvert Tax-Free Reserves
                             Money Market Portfolio
           This filing relates to the addition of a new Class T only

               (Exact Name of Registrant as Specified in Charter)

                             4550 Montgomery Avenue
                                  Suite 1000N
                            Bethesda, Maryland 20814
                    (Address of Principal Executive Offices)

                 Registrant's Telephone Number: (301) 951-4881

                           William M. Tartikoff, Esq.
                             4550 Montgomery Avenue
                                  Suite 1000N
                            Bethesda, Maryland 20814
                    (Name and Address of Agent for Service)

It is proposed that this filing will become effective

__ Immediately upon filing                  __ on (date)
pursuant to paragraph (b)                   pursuant to paragraph (b)

__ 60 days after filing                     XX on February 26, 1999
pursuant to paragraph (a)                   pursuant to paragraph (a)

of Rule 485.

<PAGE>

FRONT COVER PAGE

                                   PROSPECTUS
                               February 28, 1999

                 First Variable Rate Fund for Government Income
                   Calvert First Government Money Market Fund
                                    Class T

                           Calvert Tax-Free Reserves
                               Money Market Fund
                                    Class T

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









Table of Contents                           Page

About the Funds
     Investment goal                        _
     Investment strategies and risks        _
     Performance chart                      _
     Fees and expenses                      _
About the Advisor
     Management                             _
     Year 2000                              _
Shareholder Guide:
How to Buy Shares                           _
Other Calvert Group Features                _
Dividends, Capital Gains and Taxes          _
How to Sell Shares                          _
Financial Highlights                        _

<PAGE>

Fundamental Goals - Investment Objectives

Calvert First Government Money Market Fund
Calvert First Government Money Market Fund ("CFGMMF") is a U.S.
Government-only money market fund that seeks to earn the highest possible
yield consistent with safety, liquidity, and preservation of capital. In
pursuing its objective, CFGMMF invests only in U.S. Government-backed
obligations, including such obligations subject to repurchase agreements with
recognized securities dealers and banks. CFGMMF seeks to maintain a constant
net asset value of $1.00 per share.

CFGMMF offers five classes: O, B, C and I, which are offered in separate
prospectuses, and Class T, offered in this prospectus to investors with
brokerage accounts at The Advisors Group, Ltd. ("TAG").

Calvert Tax-Free Reserves Money Market Fund
Calvert Tax-Free Reserves Money Market Portfolio ("CTFR MM") seeks to earn the
highest interest income exempt from federal income taxes as is consistent with
prudent investment management, preservation of capital, and the quality and
maturity characteristics of CTFR MM. CTFR MM seeks to maintain a constant net
asset value of $1.00 per share.

CTFR MM offers three classes: O and I, which are each offered in separate
prospectuses, and Class T, offered in this prospectus to investors with
brokerage accounts at TAG.

Principal Investment Strategies

CFGMMF assets are invested primarily in Top-Tier Securities, such as:
      obligations issued by the U.S. Treasury, such as U.S. Treasury bills,
     notes and bonds, supported by the full faith and credit of the U.S.
     Government;
      Securities issued by the U.S. Government, its agencies and
     instrumentalities;
      repurchase agreements; and
      variable-rate demand notes.

CTFR MM assets are invested primarily in a diversified portfolio of municipal
obligations whose interest is exempt from federal income tax. At least 80% of
CTFR MM's annual income will be tax-exempt from federal taxes. CTFR MM invests
in:
      high quality variable and floating rate demand notes and/or municipal
     obligations;
      municipal bonds and notes and tax-exempt commercial paper;
      short-term fixed-rate obligations with remaining maturities of one year
     or less;

CFGMMF and CTFR MM (the "Funds"):  Rule 2a-7 under the Investment Company Act
of 1940 applies to every money market fund to ensure that a money market fund
invests only in high quality obligations, takes minimal credit risks, and has
a stable price per share. The Funds invests in accordance with Rule 2a-7 under
the Investment Company Act of 1940, as amended.

Risks of investing

The yield of each Fund will vary daily, depending on market interest rates,
and tends to follow the same direction as the rates.

All fixed income instruments are subject to interest-rate risk; that is, if
the market interest rates rise, the current price or value of a bond and the
yield of CTFR MM will decline.

Dividends paid by each Fund will fluctuate as interest rates and net
investment income fluctuate.

Investments in obligations not guaranteed by the full faith and credit of the
U.S. Government are subject to the ability of the issuer to make payment at
maturity.

Purchasing obligations for future delivery or on a "when-issued" basis may
increase a Fund's overall investment exposure and involves a risk of loss if
the value of the securities declines prior to the settlement date. The
transactions are fully secured at all times.

There is no limitation on the percentage of CTFR MM's assets that may be
invested in unrated obligations; such obligations may be less liquid than
rated obligations of comparable quality.

The sudden credit deterioration of a holding could cause the yield or overall
value of a Fund to decrease. The Fund limits the amount it invests in any one
issuer to lessen exposure.

Variable rate obligations lessen the capital fluctuations usually inherent in
fixed income investments. This diminishes the risk of capital depreciation of
investment securities and, consequently, of CTFR MM shares.

For liquidity purposes or pending the investment of the proceeds of the sale
of its shares, CTFR MM may invest in and derive up to 20% of its income from
taxable short-term money market type investments. Interest earned from such
taxable investments will be taxable as ordinary income unless you are
otherwise exempt from taxation.

An investment in the Funds is not a deposit of any bank and is neither insured
nor guaranteed by the Federal Deposit Insurance Corporation or any other
government agency. Although the Funds seek to preserve the value of your
investment at $1.00 per share, it is possible to lose money by investing in
the Funds.

Bar Charts and Performance Tables

The bar charts and tables below show the annual returns and its long-term
performance by calendar year for Class O of each of the Funds. The charts
shows how the performance has varied from year to year. The tables compare
Class O returns over time to the Lipper U.S. Government Money Market Funds
Index for CFGMMF, and the Lipper Tax-Exempt Money Market Funds Index for
CTFRMM. Each index is a composite index of the annual return of mutual funds
that have similar investment goals. Each Fund's past performance does not
necessarily indicate how it will perform in the future. Please note that
performance for Class T is not shown since it was not available for either
Fund during the time periods shown.

Bar Chart - CFGMMF
1989          _.__%        1994         _.__%
1990          _.__%        1995         _.__%
1991          _.__%        1996         _.__%
1992          _.__%        1997         _.__%
1993          _.__%        1998         _.__%

Best Quarter (of periods shown)       Q_ '__     _.__%
Worst Quarter (of periods shown)      Q_ '__     _.__%

Bar Chart - CTFR MM
1989          _.__%        1994         _.__%
1990          _.__%        1995         _.__%
1991          _.__%        1996         _.__%
1992          _.__%        1997         _.__%
1993          _.__%        1998         _.__%

Best Quarter (of periods shown)       Q_ '__     _.__%
Worst Quarter (of periods shown)      Q_ '__     _.__%

Average annual total returns for the periods ended December 31, 1998

                                    1 year     5 years    10 years
Calvert First Government Class O    __%        __%        __%
Lipper U.S. Government Money
Market Funds Index                  __%        __%        __%

                                    1 year     5 years    10 years
CTFR Money Market Class O           __%        __%        __%
Lipper Tax-Exempt Money
Market Funds Index                  __%        __%        __%

For current yield information, call 1-800-368-2745, or visit Calvert's website
at: www.calvertgroup.com.

Fees and Expenses of the Funds
These tables describe the fees and expenses you may pay if you buy and hold
shares of Class T of each Fund.

A.   Shareholder Fees
     (fees paid directly from your investment)
                                                      CFGMMF         CTFR MM
     Maximum Sales Load on Purchases                  None           None
     Maximum Deferred Sales Load                      None           None
     Maximum Sales Load on Reinvested Dividends       None           None
     Redemption Fees                                  None           None
     Exchange Fee                                     None           None

B.   Estimated Annual Fund Operating Expenses
     (expenses that are deducted from Fund assets)
                                                      CFGMMF         CTFR MM
     Management Fees                                  0.50%          0.46%
     Rule 12b-1 and/or Service Fees                   0.25%          0.25%
     Other Expenses                                   0.19%          0.14%
     Total Fund Operating Expenses                    0.94%          0.85%

C.   Example:

This example is intended to help you compare the cost of investing in a Fund
with the cost of investing in other mutual funds. The example assumes that:

               You invest $10,000 in Class T of a Fund for the time periods
              indicated;
               You redeem all shares at the end of the periods;
               Your investment has a 5% return each year; and
               The Fund's operating expenses remain the same.

         Although your actual costs may be higher or lower, under these
assumptions your costs would be:

               1 Year      3 Years      5 Years      10 Years

CFGMMF         $87         $271         $471         $1,049

CTFR MM        $96         $300         $520         $1,155

Management and Advisory Fees

Calvert Asset Management Company, Inc. ("CAMCO") is the investment advisor for
each Fund. CAMCO has been managing mutual funds since 1976, and is a
subsidiary of Calvert Group, Ltd. CAMCO currently advises 25 Calvert funds,
including the first and largest family of socially screened funds. CAMCO is
located at 4550 Montgomery Avenue, Suite 1000N, Bethesda, Maryland 20814. As
of December 31, 1998, it had over $6 billion in assets under management.

CAMCO provides the Funds with investment supervision and management;
administrative services and office space; and furnishes executive and other
personnel to the Funds. CAMCO also pays the salaries and fees of all Trustees
who are affiliated persons. CAMCO may pay certain advertising and promotional
expenses of the Funds. Pursuant to the Investment Advisory Agreement, CAMCO is
entitled to an annual advisory fee of 0.25% of the average daily net assets of
CFGMMF. The CTFR MM Investment Advisory Agreement entitles CAMCO to receive an
annual advisory fee of 0.25% of the first $500 million of average daily net
assets, 0.20% of the next $500 million, and 0.15% on assets of $1 billion or
more. CAMCO may voluntarily waive a portion of its advisory fee.

A Word About the Year 2000 (Y2K) and Our Computer Systems

Like other mutual funds, Calvert and its service providers use computer
systems for all aspects of our business -- processing shareholder and fund
transactions, fund accounting, executing trades, and pricing securities, just
to name a few. Many current software programs cannot distinguish between the
year 2000 and the year 1900. This can cause problems with retirement plan
distributions, dividend payment software, transaction software, and numerous
other areas that could impact the Funds. Calvert has been reviewing all of its
computer systems for Y2K compliance. CAMCO, the underwriter, transfer agent,
and custodians have advised the Funds that they have been actively working on
any necessary changes to their computer systems to prepare for Y2K. Each of
the entities named expects that their systems and those of their outside
service providers will be Y2K compliant, and the Funds do not anticipate a
negative impact. For more information, please visit our website at
www.calvertgroup.com.

- --------------------------------------------------------------------------------
                               SHAREHOLDER GUIDE
- --------------------------------------------------------------------------------

HOW TO BUY SHARES

Please contact your local office of The Advisors Group, Ltd. ("TAG") to open
your money market account. All transactions will be processed electronically
through the National Financial Proprietary Money Market Sweep Program on
behalf of TAG.

There is no minimum for initial investments and no minimum for subsequent
investments, provided you have a TAG brokerage account.

Because you are purchasing shares through a program of services offered by
TAG, a registered broker/dealer and investment advisor, you should read the
TAG program materials together with this Prospectus. Certain account features
have been modified for this program, and TAG may impose charges for their
services.

Important - How Shares are Priced
The price of shares is based on each Fund's net asset value ("NAV"). NAV is
computed per class by adding the value of a Fund's holdings plus other assets,
subtracting liabilities, and then dividing the result by the number of shares
outstanding.

Each Fund is valued according to the "amortized cost" method, which is
intended to stabilize the NAV at $1 per share. If market quotations are not
readily available, securities are valued by a method that the Fund's Board of
Trustees/Directors believes accurately reflects fair value.

The NAV is calculated as of the close of each business day, which coincides
with the closing of the regular session of the New York Stock Exchange
("NYSE") (normally 4 p.m. ET). Each Fund is open for business each day the
NYSE is open. Please note that there are some federal holidays, such as
Columbus Day and Veterans Day, when the NYSE is open and each Fund is open,
but no purchases may be made due to the closure of the banking system.

When Your Account Will Be Credited
Your purchase will be processed at the NAV calculated after your order is
received and accepted. Electronic sweeps into an account begin earning
dividends the next business day.

Each Fund reserves the right to suspend the offering of shares for a period of
time or to reject any specific purchase order.

DIVIDENDS, CAPITAL GAINS AND TAXES

Each Fund accrues dividends daily from its net investment income, and pays the
dividends monthly. Net investment income consists of interest income, net
short-term capital gains, if any, and dividends declared and paid on
investments, less expenses. Distributions of net short-term capital gains
(treated as dividends for tax purposes) and net long-term capital gains, if
any, are normally paid once a year; however, the Funds do not anticipate
making any such distributions unless available capital loss carryovers have
been used or have expired.

Dividend payment options
Dividends and any distributions are automatically reinvested in the same Fund
at NAV (without sales charge), unless you elect to have amounts of $10 or more
paid in cash (by check).

Federal Taxes
In January, TAG will mail Form 1099-DIV, indicating taxable dividends and any
capital gain distributions paid to you during the past year. Generally,
dividends and distributions are taxable in the year they are paid. However,
any dividends and distributions paid in January but declared during the prior
three months are taxable in the year declared. Dividends and distributions are
taxable to you regardless of whether they are taken in cash or reinvested.
Dividends, including short-term capital gains, are taxable as ordinary income.
Distributions from long-term capital gains are taxable as long-term capital
gains, regardless of how long you have owned shares.

Other Tax Information
In addition to federal taxes for Calvert First Government Money Market Fund,
you may be subject to state or local taxes on your investment, depending on
the laws in your area. You will be notified to the extent, if any, that
dividends reflect interest received from US government securities. Such
dividends may be exempt from certain state income taxes.

Taxpayer Identification Number
If we do not have your correct Social Security or Taxpayer Identification
Number ("TIN") and a signed certified application or Form W-9, Federal law
requires us to withhold 31% of your reportable dividends, and possibly 31% of
certain redemptions. In addition, you may be subject to a fine by the Internal
Revenue Service.

HOW TO SELL SHARES

You may redeem all or a portion of your shares on any day the Funds are open
for business, provided the amount requested is not on hold. Your shares will
be redeemed at the next NAV calculated after your redemption request is
received and accepted. You will receive dividends through the date the request
is received and processed. The proceeds will normally be sent to you on the
next business day, but if making immediate payment could adversely affect your
Fund, it may take up to seven (7) days to make payment. The Funds have the
right to redeem shares in assets other than cash for redemption amounts
exceeding, in any 90-day period, $250,000 or 1% of the net asset value of the
Fund, whichever is less. When the NYSE is closed (or when trading is
restricted) for any reason other than its customary weekend or holiday
closings, or under any emergency circumstances as determined by the Securities
and Exchange Commission, redemptions may be suspended or payment dates
postponed. Please note that there are some federal holidays such as Columbus
Day and Veterans Day, when the NYSE is open and each Fund is open, but
redemptions cannot be made due to the closure of the banking system.

BY TELEPHONE
You may redeem shares from your account by telephone and have your money sent
by check, electronically transferred, or wired to a bank you have previously
authorized by contacting your local office of TAG.

CHECKWRITING
Checkwriting will be offered through TAG. The checkwriting features vary,
depending on what you choose when you open the money market sweep account with
TAG.  Please see the TAG program materials for information.

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

                              To Open an Account:
                                  800-777-1500

                            Performance and Prices:
                                  800-777-1500

                         Service for Existing Accounts:
                                  800-777-1500

                            Registered, Certified or
                                Overnight Mail:
                            The Advisors Group, Ltd.
                             7315 Wisconsin Avenue
                            Bethesda, Maryland 20814

                             PRINCIPAL UNDERWRITER
                           Calvert Distributors, Inc.
                             4550 Montgomery Avenue
                                  Suite 1000N
                            Bethesda, Maryland 20814

<PAGE>


Outside Back Cover Page

Statements of Additional Information ("SAIs") (dated February 28, 1999) for
the Funds have been filed with the Securities and Exchange Commission and is
incorporated by reference. Additional information about each Fund's
investments is available in each Fund's annual and semi-annual reports to
shareholders. The SAIs and each Fund's annual and semi-annual reports are
available, without charge and upon request, from the Funds at 800-368-2750.


Information about the Funds (including the SAIs) can be reviewed at the
Commission's Public Reference Room in Washington, D.C. Information on the
operation of the public reference room may be obtained by calling the
Commission at 1-800-SEC-0330. Reports and other information about the Funds
are available on the Commission's internet site at http://www.sec.gov. Copies
of this information may be obtained, by payment of a duplicating fee, by
writing the Public Reference Section of the Commission, Washington, D.C.
20549-6009.


811-2633 First Variable Rate Fund

811-3101 Calvert Tax-Free Reserves

<PAGE>


                           Calvert Tax-Free Reserves
                             Money Market Portfolio
                             Limited-Term Portfolio

                      Statement of Additional Information

                               February 28, 1999

INVESTMENT ADVISOR
Calvert Asset Management Company, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

SHAREHOLDER SERVICE
Calvert Shareholder Services, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

PRINCIPAL UNDERWRITER
Calvert Distributors, Inc.
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

TRANSFER AGENT
National Financial Data Services, Inc.
1004 Baltimore
6th Floor
Kansas City, Missouri 64105

INDEPENDENT ACCOUNTANTS
PricewaterhouseCoopers
250 West Pratt Street
Baltimore, Maryland 21201


     TABLE OF CONTENTS

     Investment Objective                                      1
     Investment Policies                                       1
     Investment Restrictions                                   2
     Purchases and Redemptions of Shares                       3
     Reduced Sales Charges                                     4
     Dividends and Distributions                               4
     Tax Matters                                               4
     Valuation of Shares                                       5
     Calculation of Yield and Total Return                     6
     Advertising                                               7
     Trustees and Officers                                     8
     Investment Advisor                                       10
     Administrative Services                                  10
     Transfer and Shareholder Servicing Agents                11
     Independent Accountants and Custodians                   11
     Method of Distribution                                   11
     Portfolio Transactions                                   11
     General Information                                      12
     Control Persons and Principal Holders of Securities      12
     Appendix                                                 13

<PAGE>

STATEMENT OF ADDITIONAL INFORMATION-February 28, 1999

                           CALVERT TAX-FREE RESERVES
                             Money Market Portfolio
                             Limited-Term Portfolio
                4550 Montgomery Avenue, Bethesda, Maryland 20814
- --------------------------------------------------------------------------------

New Account Information
         (800) 368-2748
         (301) 951-4820

Shareholder Services
         (800) 368-2745

Broker Services
         (800) 368-2746
         (301) 951-4850

TDD for the Hearing- Impaired
         (800) 541-1524

         This   Statement  of  Additional   Information  is  not  a  prospectus.
Investors  should read the Statement of Additional  Information  in  conjunction
with the Calvert Tax-Free  Reserves  Prospectus,  dated April 30, 1998 for Class
O and I, and  February  28,  1999 for  Class T,  which may be  obtained  free of
charge by  writing  the Fund at the  above  address  or  calling  the  telephone
numbers listed above.

         The audited  financial  statements in the Portfolios'  Annual Report to
Shareholders  dated December 31, 1998, are expressly  incorporated  by reference
and  made a part of this  Statement  of  Additional  Information.  A copy of the
Annual  Report  may be  obtained  free of  charge  by  writing  or  calling  the
Portfolios.

- --------------------------------------------------------------------------------
                              INVESTMENT OBJECTIVE
- --------------------------------------------------------------------------------

         The Money Market and  Limited-Term  Portfolios (the  "Portfolios")  are
series of Calvert  Tax-Free  Reserves (the "Fund"),  and are designed to provide
individual and  institutional  investors in higher tax brackets with the highest
level of interest  income  exempt from  federal  income  taxes as is  consistent
with prudent  investment  management,  preservation of capital,  and the quality
and maturity  characteristics  prescribed for each  Portfolio.  The Money Market
Portfolio  further  seeks to  maintain a constant  net asset  value of $1.00 per
share.   There  is,  of  course,  no  assurance  that  the  Portfolios  will  be
successful  in meeting their  investment  objectives  or  maintaining  the Money
Market  Portfolio's  net asset value  constant at $1.00 per share  because there
are inherent risks in the ownership of any investment.
         Dividends paid by the  Portfolios  will fluctuate with income earned on
investments.  In addition,  the dividends and  distributions  paid and the value
of each  share  will  vary by class of  shares;  the  value of the  Limited-Term
Portfolio's  shares will  fluctuate  to reflect  changes in the market  value of
the  Portfolio's  investments.  The  Portfolios  will attempt,  through  careful
management  and   diversification,   to  reduce  these  risks  and  enhance  the
opportunities for higher income and greater price stability.

- --------------------------------------------------------------------------------
                              INVESTMENT POLICIES
- --------------------------------------------------------------------------------

         The Money  Market  Portfolio  and  Limited-Term  Portfolio  each invest
primarily in a diversified  portfolio of municipal  obligations  whose  interest
is exempt from federal  income tax. The Portfolios  differ in their  anticipated
income yields,  quality,  length of average weighted maturity, and capital value
volatility.  A complete explanation of municipal  obligations and municipal bond
and note ratings is set forth in the Appendix.
         The  credit  rating of each  Portfolio's  assets as of its most  recent
fiscal year-end  appears in the Annual Report to  Shareholders,  incorporated by
reference herein.

Variable Rate Demand Notes
         The  Board  of  Trustees  has  approved  investments  in  floating  and
variable  rate demand notes upon the  following  conditions:  the Fund has right
of  demand,  upon  notice  not to exceed  thirty  days,  against  the  issuer to
receive  payment;  the issuer  will be able to make  payment  upon such  demand,
either  from its own  resources  or through  an  unqualified  commitment  from a
third party;  and the rate of interest  payable is calculated to ensure that the
market value of such notes will  approximate par value on the adjustment  dates.
The  remaining  maturity  of such  demand  notes is deemed the period  remaining
until  such  time as the Fund has the right to  dispose  of the notes at a price
which approximates par and market value.

Municipal Leases
         The   Portfolio   may  invest  in  municipal   leases,   or  structured
instruments  where the  underlying  security is a municipal  lease.  A municipal
lease is an obligation of a government or  governmental  authority,  not subject
to voter approval,  used to finance capital  projects or equipment  acquisitions
and payable  through  periodic  rental  payments.  The  Portfolio  may  purchase
unrated  leases.  The  Fund's  Advisor,  under the  supervision  of the Board of
Trustees/Directors,  is responsible  for  determining the credit quality of such
leases on an ongoing basis,  including an assessment of the likelihood  that the
lease  will  not  be  canceled.  Certain  municipal  leases  may  be  considered
illiquid  and  subject to the  Portfolio's  limit on  illiquid  securities.  The
Board of  Trustees/Directors  has  directed  the  Advisor  to treat a  municipal
lease as a liquid  security if it satisfies the following  conditions:  (A) such
treatment must be consistent with the Portfolio's investment  restrictions;  (B)
the Advisor  should be able to conclude  that the  obligation  will maintain its
liquidity  throughout  the  time  it is  held  by the  Portfolio,  based  on the
following  factors:  (1) whether the lease may be terminated by the lessee;  (2)
the  potential  recovery,  if  any,  from a sale  of the  leased  property  upon
termination of the lease;  (3) the lessee's  general credit strength (e.g.,  its
debt,  administrative,  economic and financial  characteristics  and prospects);
(4) the likelihood that the lessee will  discontinue  appropriating  funding for
the leased  property  because the property is no longer deemed  essential to its
operations  (e.g.,  the potential for an "event of  nonappropriation"),  and (5)
any  credit   enhancement   or  legal   recourse   provided  upon  an  event  of
nonappropriation  or other  termination  of the lease;  (C) the  Advisor  should
determine  whether the  obligation  can be disposed of within  seven days in the
ordinary course of business at  approximately  the amount at which the Portfolio
has valued it for  purposes of  calculating  the  Portfolio's  net asset  value,
taking into  account the  following  factors:  (1) the  frequency  of trades and
quotes;  (2) the  volatility of quotations  and trade prices;  (3) the number of
dealers  willing to purchase or sell the  security  and the number of  potential
purchasers;  (4) dealer  undertakings to make a market in the security;  (5) the
nature of the  security  and the nature of the  marketplace  trades  (e.g.,  the
time needed to dispose of the  security,  the method of soliciting  offers,  and
the  mechanics  of the  transfer);  (6)  the  rating  of the  security  and  the
financial  condition  and  prospects  of  the  issuer;  and  (7)  other  factors
relevant  to the  Portfolio's  ability to dispose of the  security;  and (D) the
Advisor  should  have   reasonable   expectations   that  the  municipal   lease
obligation  will maintain its liquidity  throughout  the time the  instrument is
held by the Portfolio.

Obligations with Puts Attached
         The Fund has  authority to purchase  securities  at a price which would
result in a yield to maturity  lower than that  generally  offered by the seller
at the time of  purchase  when it can acquire at the same time the right to sell
the  securities  back to the seller at an agreed upon price at any time during a
stated  period or on a certain  date.  Such a right is  generally  denoted  as a
"put." A Portfolio may not acquire  obligations  subject to puts if  immediately
thereafter,  with  respect  to 75% of the  total  amortized  cost  value  of its
assets,  that  Portfolio  would  have more  than 5% of its  assets  invested  in
securities  underlying  puts  from  the  same  institution.   A  Portfolio  may,
however,  invest up to 10% of its assets in securities underlying  unconditional
puts from the same institution.  Unconditional  puts are readily  exercisable in
the event of a default in payment of  principal  or interest  on the  underlying
securities.  The Money Market  Portfolio  must limit its portfolio  investments,
including  puts,  to  instruments  of high quality as determined by a nationally
recognized statistical rating organization.

Temporary Investments
         Short-term  money market type  investments  consist of:  obligations of
the  U.S.  Government,  its  agencies  and  instrumentalities;  certificates  of
deposit of banks with assets of one billion  dollars or more;  commercial  paper
or other  corporate  notes of investment  grade  quality;  and any of such items
subject to short-term repurchase agreements.
         The Fund intends to minimize  taxable income through  investment,  when
possible, in short-term tax-exempt  securities.  To minimize taxable income, the
Fund  may also  hold  cash  which is not  earning  income.  It is a  fundamental
policy of the Fund that during  normal  market  conditions  the Fund's assets be
invested so that at least 80% of the Fund's annual income will be tax-exempt.

When-Issued Purchases
         Securities  purchased on a when-issued  basis and the  securities  held
in the Fund's  Portfolios  are subject to changes in market value based upon the
public's  perception  of the  creditworthiness  of the issuer and changes in the
level of interest rates (which will  generally  result in both changing in value
in the same way,  i.e.,  both  experiencing  appreciation  when  interest  rates
decline and depreciation  when interest rates rise).  Therefore,  if in order to
achieve higher interest income,  the Fund remains  substantially  fully invested
at the same  time  that it has  purchased  securities  on a  when-issued  basis,
there will be a greater  possibility  that the market value of the Fund's assets
may vary.  No new  when-issued  commitments  will be made by a Portfolio if more
than 50% of that Portfolio's net assets would become so committed.
         When the time comes to pay for  when-issued  securities,  the Fund will
meet its  obligations  from then  available  cash flow,  sale of securities  or,
although it would not  normally  expect to do so,  from sale of the  when-issued
securities  themselves  (which may have a market value  greater or less than the
Fund's  payment  obligation).  Sale  of  securities  to  meet  such  obligations
carries with it a greater  potential for the  realization  of capital losses and
capital gains which are not exempt from federal income tax.

- --------------------------------------------------------------------------------
                            INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------

Fundamental Investment Restrictions
         The  Portfolios  have  adopted  the  following  fundamental  investment
restrictions.  These restrictions  cannot be changed without the approval of the
holders of a majority of the outstanding shares of the Portfolios.

         (1) Each  Portfolio may not make any  investment  inconsistent
         with its  classification as a diversified  investment  company
         under the 1940 Act.
         (2) Each  Portfolio may not  concentrate  its  investments  in
         the   securities   of   issuers   primarily   engaged  in  any
         particular   industry   (other  than   securities   issued  or
         guaranteed   by  the  U.S.   Government  or  its  agencies  or
         instrumentalities    and   repurchase    agreements    secured
         thereby), or domestic bank money market instruments.
         (3) Each  Portfolio may not issue senior  securities or borrow
         money,  except from banks for temporary or emergency  purposes
         and then  only in an  amount up to 33 1/3% of the value of the
         affected  Portfolio's  total assets or as permitted by law and
         except by engaging  in reverse  repurchase  agreements,  where
         allowed.  In order to  secure  any  permitted  borrowings  and
         reverse  repurchase   agreements  under  this  section,   each
         Portfolio may pledge, mortgage or hypothecate its assets.
         (4)  Each  Portfolio  may not  underwrite  the  securities  of
         other  issuers,  except  as  allowed  by law or to the  extent
         that the  purchase  of  municipal  obligations  in  accordance
         with a Portfolio's  investment objective and policies,  either
         directly  from  the  issuer,  or  from an  underwriter  for an
         issuer, may be deemed an underwriting.
         (5) Each  Portfolio may not invest  directly in commodities or
         real  estate,  although a Portfolio  may invest in  securities
         which are  secured  by real  estate or real  estate  mortgages
         and   securities   of   issuers   which   invest  or  deal  in
         commodities,  commodity  futures,  real  estate or real estate
         mortgages.
         (6) Each  Portfolio  may not make  loans,  other than  through
         the  purchase  of  money  market  instruments  and  repurchase
         agreements  or by the purchase of bonds,  debentures  or other
         debt  securities,  or as permitted by law. The purchase of all
         or  a  portion   of  an  issue  of   publicly   or   privately
         distributed   debt   obligations   in  accordance   with  each
         Portfolio's  investment objective,  policies and restrictions,
         shall not constitute the making of a loan.

Nonfundamental Investment Restrictions
         The  Board  of  Trustees  has  adopted  the  following   nonfundamental
investment  restrictions.   A  nonfundamental   investment  restriction  can  be
changed by the Board at any time without a shareholder vote.

         (1) Each Portfolio may not purchase common stocks, preferred stocks,
             warrants, or other equity securities.
         (2) Each Portfolio does not intend to make any purchases of
             securities if borrowing exceeds 5% of the affected Portfolio's
             total assets.
         (3) Each Portfolio may not sell securities short, purchase securities
             on margin, or write put or call options, except as permitted for
             Long-Term and Vermont in connection with transactions in futures
             contracts and options thereon. The Funds reserve the right to
             purchase securities with puts attached or with demand features.
         (4) Each Portfolio may not write or purchase put or call options.

- --------------------------------------------------------------------------------
                      PURCHASES AND REDEMPTIONS OF SHARES
- --------------------------------------------------------------------------------

         Share  certificates  will not be issued unless  requested in writing by
the  investor.  No  charge  will be made  for  share  certificate  requests.  No
certificates will be issued for fractional shares.
         Draft   writing  is   available   for  the  Money   Market   Portfolio.
Shareholders  wishing  to use the draft  writing  service  should  complete  the
signature  card enclosed with the Investment  Application.  This service will be
subject to the customary  rules and  regulations  governing  checking  accounts,
and the  Portfolio  reserves  the  right  to  change  or  suspend  the  service.
Generally,  there is no charge to you for the  maintenance  of this  service  or
the  clearance  of  drafts,  but the  Portfolio  reserves  the right to charge a
service  fee for  drafts  returned  for  insufficient  funds.  As a  service  to
shareholders,  the  Portfolio  may  automatically  transfer  the  dollar  amount
necessary  to cover  drafts you have  written on the  Portfolio  to your account
from any other of your identically  registered  accounts in Calvert money market
funds  or  Calvert  Insured  Plus.  The  Portfolio  may  charge  a fee for  this
service.
         Drafts  presented to the  Custodian for payment which would require the
redemption of shares  purchased by check or  electronic  funds  transfer  within
the previous 10 business days will not be honored.
         When a payable  through  draft  ("check") is presented  for payment,  a
sufficient number of full and fractional  shares from the shareholder's  account
to cover the amount of the draft will be  redeemed  at the net asset  value next
determined.  If there are insufficient shares in the shareholder's  account, the
draft will be returned.
         To change  redemption  instructions  already given,  shareholders  must
send a written notice to Calvert Group,  c/o NFDS,  6th Floor,  1004  Baltimore,
Kansas  City,  MO  64105,  with a voided  copy of a check  for the  bank  wiring
instructions  to be added.  If a voided  check does not  accompany  the request,
then the request must be signature  guaranteed  by a  commercial  bank,  savings
and loan  association,  trust  company,  member firm of any national  securities
exchange,   or  credit  union.  Further   documentation  may  be  required  from
corporations, fiduciaries, and institutional investors.
         The  right  of  redemption  may be  suspended  or the  date of  payment
postponed  for any period  during  which the New York Stock  Exchange  is closed
(other than  customary  weekend and holiday  closings),  when trading on the New
York Stock  Exchange is  restricted,  or an emergency  exists,  as determined by
the SEC, or if the  Commission  has ordered such a suspension for the protection
of  shareholders.  Redemption  proceeds  are  normally  mailed or wired the next
business  day  after a  proper  redemption  request  has been  received,  unless
redemptions have been suspended or postponed as described above.
         Redemption proceeds are normally paid in cash.  However,  the Portfolio
has the  right to  redeem  shares  in  assets  other  than  cash for  redemption
amounts exceeding,  in any 90-day period,  $250,000 or 1% of the net asset value
of the Portfolio, whichever is less.

- --------------------------------------------------------------------------------
                             REDUCED SALES CHARGES
- --------------------------------------------------------------------------------

         The  Limited-Term  Portfolio  imposes  reduced sales charges for shares
in certain  situations  in which the  Principal  Underwriter  (which  offers the
Portfolio's  shares  continuously and on a "best efforts" basis) and the dealers
selling  Limited-Term   Portfolio  shares  may  expect  to  realize  significant
economies  of scale with  respect to such sales.  Generally,  sales costs do not
increase in proportion to the dollar amount of the shares sold;  the  per-dollar
transaction  cost for a sale to an  investor  of shares  worth,  say,  $5,000 is
generally  much  higher  than the  per-dollar  cost for a sale of  shares  worth
$1,000,000.  Thus, the applicable  sales charge  declines as a percentage of the
dollar amount of shares sold as the dollar amount increases.
         When a  shareholder  agrees to make  purchases  of shares over a period
of time  totaling a certain  dollar amount  pursuant to a Letter of Intent,  the
Underwriter  and selling  dealers can expect to realize the  economies  of scale
applicable  to that stated goal  amount.  Thus the  Portfolio  imposes the sales
charge  applicable to the goal amount.  Similarly,  the  Underwriter and selling
dealers also  experience  cost savings  when  dealing  with  existing  Portfolio
shareholders,  enabling the Portfolio to afford existing  shareholders the Right
of  Accumulation.  The  Underwriter  and  selling  dealers  can also  expect  to
realize  economies  of  scale  when  making  sales  to the  members  of  certain
qualified  groups which agree to facilitate  distribution of Portfolio shares to
their  members.  See  "Exhibit A - Reduced  Sales  Charges" in the  Limited-Term
Prospectus.

- --------------------------------------------------------------------------------
                          DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------

         The Money Market  Portfolio  declares daily and pays monthly  dividends
of its daily net income to  shareholders  of record as of the close of  business
each  business  day,  thus  allowing  daily   compounding   of  dividends.   The
Limited-Term  Portfolio  declares and pays  monthly  dividends of its net income
to  shareholders  of  record  as of the  close of  business  on each  designated
monthly  record date.  Dividends and  distributions  paid by each  Portfolio may
differ  among the  classes.  Net  investment  income  consists  of the  interest
income  earned on  investments  (adjusted  for  amortization  of original  issue
discounts or premiums or market  premiums),  less  estimated  expenses.  Capital
gains,  if  any,  are  normally  paid  once a year  and  will  be  automatically
reinvested  at  net  asset  value  in  additional  shares.   Dividends  and  any
distributions  are  automatically  reinvested in additional  shares of the Fund,
unless  you  elect to have the  dividends  of $10 or more paid in cash (by check
or by Calvert  Money  Controller).  You may also request to have your  dividends
and  distributions  from the  Portfolio  invested in shares of any other Calvert
Group Fund,  subject to the applicable  sales charge for that Fund or Portfolio.
If you elect to have dividends and/or  distributions  paid in cash, and the U.S.
Postal  Service  returns  the  check as  undeliverable,  it,  as well as  future
dividends and distributions, will be reinvested in additional shares.
         Purchasers  of  shares  of  the  Money  Market   Portfolio  will  begin
receiving  dividends  upon the date  federal  funds  are  received  by the Fund.
Shareholders   redeeming  shares  by  telephone  electronic  funds  transfer  or
written  request will  receive  dividends  through the date that the  redemption
request is received;  Money Market  Portfolio  shareholders  redeeming shares by
draft  will  receive  dividends  up to the date such draft is  presented  to the
Portfolio for payment.

- --------------------------------------------------------------------------------
                                  TAX MATTERS
- --------------------------------------------------------------------------------

         In  1998,  the  Portfolios  did  qualify  and in 1999,  the  Portfolios
intend to qualify as a  "regulated  investment  company"  under  Subchapter M of
the Internal  Revenue Code as amended (the "Code").  By so qualifying,  the Fund
will not be  subject  to  federal  income  tax,  nor to the  federal  excise tax
imposed  by the Tax  Reform  Act of 1986  (the  "Act"),  to the  extent  that it
distributes its net investment income and realized capital gains.
         The  Portfolio's   dividends  of  net  investment   income   constitute
exempt-interest  dividends on which  shareholders  are not generally  subject to
federal income tax;  however under the Act,  dividends  attributable to interest
on certain  private  activity  bonds  must be  included  in federal  alternative
minimum  taxable  income for the purpose of  determining  liability (if any) for
individuals  and for  corporations.  Each  Portfolio's  dividends  derived  from
taxable  interest and  distributions  of net short-term  capital gains,  whether
taken in cash or reinvested in additional  shares,  are taxable to  shareholders
as ordinary income and do not qualify for the dividends  received  deduction for
corporations.
         A  shareholder  may  also be  subject  to  state  and  local  taxes  on
dividends and  distributions  from the Fund.  The Fund will notify  shareholders
annually  about the federal tax status of dividends  and  distributions  paid by
the Fund and the amount of  dividends  withheld,  if any,  during  the  previous
year.
         The Code provides that interest on  indebtedness  incurred or continued
in order to purchase or carry  shares of a regulated  investment  company  which
distributes  exempt-interest  dividends  during  the  year  is  not  deductible.
Furthermore,  entities  or  persons  who are  "substantial  users"  (or  persons
related to  "substantial  users") of  facilities  financed  by private  activity
bonds should consult their tax advisors  before  purchasing  shares of the Fund.
"Substantial  user" is generally defined as including a "non-exempt  person" who
regularly  uses in trade or  business  a part of a  facility  financed  from the
proceeds of private activity bonds.
         Investors  should note that the Code may require  investors  to exclude
the  initial  sales  charge,  if  any,  paid  on the  purchase  of  Limited-Term
Portfolio  shares  from  the  tax  basis  of  those  shares  if the  shares  are
exchanged  for shares of another  Calvert Group Fund within 90 days of purchase.
This  requirement  applies  only to the extent that the payment of the  original
sales  charge on the shares of the  Portfolio  causes a  reduction  in the sales
charge  otherwise  payable on the shares of the Calvert  Group Fund  acquired in
the exchange,  and investors may treat sales charges  excluded from the basis of
the original sales as incurred to acquire the new shares.
         The Fund is required  to withhold  31% of any  long-term  capital  gain
dividends and 31% of each redemption  transaction  occurring in the Limited-Term
Portfolio if: (a) the  shareholder's  social  security  number or other taxpayer
identification  number ("TIN") is not provided or an obviously  incorrect TIN is
provided;  (b) the shareholder  does not certify under penalties of perjury that
the TIN provided is the  shareholder's  correct TIN and that the  shareholder is
not  subject  to backup  withholding  under  section  3406(a)(1)(C)  of the Code
because of underreporting  (however,  failure to provide certification as to the
application of section  3406(a)(1)(C)  will result only in backup withholding on
capital  gain  dividends,  not on  redemptions);  or (c) the Fund is notified by
the  Internal  Revenue  Service  that the TIN  provided  by the  shareholder  is
incorrect  or that there has been  underreporting  of interest or  dividends  by
the  shareholder.   Affected  shareholders  will  receive  statements  at  least
annually specifying the amount withheld.
         In addition,  the  Limited-Term  Portfolio is required to report to the
Internal  Revenue Service the following  information  with respect to redemption
transactions in the Portfolio:  (a) the  shareholder's  name,  address,  account
number  and  taxpayer  identification  number;  (b)  the  dollar  value  of  the
redemptions; and (c) the Portfolio's identifying CUSIP number.
         Certain  shareholders are, however,  exempt from the backup withholding
and broker reporting  requirements.  Exempt shareholders include:  corporations;
financial institutions;  tax-exempt organizations;  individual retirement plans;
the U.S.,  a State,  the  District of  Columbia,  a U.S.  possession,  a foreign
government,  an  international  organization,   or  any  political  subdivision,
agency,  or   instrumentality   of  any  of  the  foregoing;   U.S.   registered
commodities or securities  dealers;  real estate investment  trusts;  registered
investment  companies;  bank common trust funds;  certain charitable trusts; and
foreign  central  banks of issue.  Non-resident  aliens also are  generally  not
subject to either  requirement but, along with certain foreign  partnerships and
foreign  corporations,  may instead be subject to withholding under section 1441
of the  Code.  Shareholders  claiming  exemption  from  backup  withholding  and
broker reporting should call or write the Fund for further information.

- --------------------------------------------------------------------------------
                              VALUATION OF SHARES
- --------------------------------------------------------------------------------

Money Market Portfolio
         The  Money  Market  Portfolio's   assets,   including   commitments  to
purchase  securities  on a  when-issued  basis,  are  normally  valued  at their
amortized  cost,  which does not take into account  unrealized  capital gains or
losses.  This  involves  valuing  an  instrument  at  its  cost  and  thereafter
assuming a  constant  amortization  to  maturity  of any  discount  or  premium,
regardless of the impact of  fluctuating  interest  rates on the market value of
the  instrument.  While this method  provides  certainty  in  valuation,  it may
result in periods  during which value,  as  determined  by  amortized  cost,  is
higher  or  lower  than  the  price  that  would be  received  upon  sale of the
instrument.  During  periods of  declining  interest  rates,  the daily yield on
shares  of  the  Money  Market  Portfolio  may  tend  to be  higher  than a like
computation  made by a fund with  identical  investments  utilizing  a method of
valuation  based upon market  prices and  estimates of market  prices for all of
its  portfolio  instruments.  Thus,  if the use of  amortized  cost by the Money
Market Portfolio  resulted in a lower aggregate  portfolio value on a particular
day,  a  prospective  investor  in the  Portfolio  would  be  able to  obtain  a
somewhat  higher yield than would  result from  investment  in a fund  utilizing
solely market  values,  and existing  investors in the  Portfolio  would receive
less  investment  income.  The  converse  would  apply  in a  period  of  rising
interest rates.
         Rule 2a-7 under the  Investment  Company  Act of 1940  permits the Fund
to value the  assets of the Money  Market  Portfolio  at  amortized  cost if the
Money Market Portfolio  maintains a dollar-weighted  average maturity of 90 days
or less and only purchases  obligations having remaining  maturities of one year
or less.  Rule 2a-7  requires,  as a condition of its use, that the Money Market
Portfolio  invest only in  obligations  determined by the Trustees to be of high
quality  with  minimal  credit  risks  and  further  requires  the  Trustees  to
establish  procedures designed to stabilize,  to the extent reasonably possible,
the  Portfolio's  price  per  share as  computed  for the  purpose  of sales and
redemptions  at  $1.00.  Such  procedures  include  review  of  the  Portfolio's
investment  holdings  by the  Trustees,  at  such  intervals  as they  may  deem
appropriate,  to determine  whether the Portfolio's  net asset value  calculated
by using  available  market  quotations or  equivalents  deviates from $1.00 per
share based on amortized  cost. If such deviation  exceeds  0.50%,  the Trustees
will  promptly  consider what action,  if any,  will be initiated.  In the event
the  Trustees  determine  that a deviation  exists  which may result in material
dilution or other  unfair  results to investors  or existing  shareholders,  the
Trustees  will  take such  corrective  action as they  regard as  necessary  and
appropriate,  including:  the sale of portfolio instruments prior to maturity to
realize capital gains or losses or to shorten average  portfolio  maturity;  the
withholding  of  dividends or payment of  distributions  from capital or capital
gains;  redemptions  of  shares  in kind;  or the  establishment  of a net asset
value per share based on available market quotations.

Limited-Term Portfolio
         The Limited-Term  Portfolio's assets are valued,  utilizing the average
bid dealer  market  quotation as furnished by an  independent  pricing  service.
Securities  and  other  assets  for  which  market  quotations  are not  readily
available  are valued  based on the  current  market for similar  securities  or
assets,   as  determined  in  good  faith  by  the  Fund's   Advisor  under  the
supervision of the Board of Trustees.
         Valuations,  market quotations and market  equivalents are provided the
Portfolio by Kenny S&P Evaluation  Services,  a subsidiary of  McGraw-Hill.  The
use of Kenny as a pricing  service by the  Portfolio  has been  approved  by the
Board  of  Trustees.   Valuations  provided  by  Kenny  are  determined  without
exclusive  reliance  on quoted  prices and take into  consideration  appropriate
factors  such as  institution-size  trading  in  similar  groups of  securities,
yield, quality, coupon rate, maturity,  type of issue, trading  characteristics,
and other market data.
         Each  Portfolio  determines  the net asset  value of its  shares  every
business  day at the  close  of the  regular  session  of  the  New  York  Stock
Exchange  (generally,  4:00 p.m.  Eastern time),  and at such other times as may
be necessary or  appropriate.  The  Portfolios  do not determine net asset value
on  certain  national  holidays  or  other  days on  which  the New  York  Stock
Exchange is closed:  New Year's Day,  Martin Luther King Day,  Presidents'  Day,
Good Friday,  Memorial Day,  Independence Day, Labor Day,  Thanksgiving Day, and
Christmas Day.

Net Asset Value and Offering Price Per Share, 12/31/98
Money Market Portfolio
         Class O ($______/_____ shares)                       $1.00
         Institutional Class ($______/_____ shares)           $1.00
         Class T not available on 12/31/98

Limited-Term Portfolio
         Net asset value per share
         ($______/_____ shares)                               $__.__
         Maximum sales charge
         (1.00% of offering price)                             __.__
         Offering price per share                             $__.__

- --------------------------------------------------------------------------------
                     CALCULATION OF YIELD AND TOTAL RETURN
- --------------------------------------------------------------------------------

Money Market Portfolio
         From time to time the Money  Market  Portfolio  advertises  its "yield"
and "effective  yield." Both yield figures are based on historical  earnings and
are  not  intended  to  indicate   future   performance.   Yield  is  calculated
separately  by class.  The "yield" of the Money Market  Portfolio  refers to the
income  generated by an  investment  in the  Portfolio  over a  particular  base
period of time.  The length and  closing  date of the base period will be stated
in the  advertisement.  If the base  period is less than one year,  the yield is
then  "annualized."  That is, the net change,  exclusive of capital changes,  in
the value of a share  during the base  period is divided by the net asset  value
per share at the  beginning of the period,  and the result is  multiplied by 365
and divided by the number of days in the base period.  Capital changes  excluded
from the  calculation  of yield are: (1) realized gains and losses from the sale
of  securities,  and (2) unrealized  appreciation  and  depreciation.  The Money
Market  Portfolio's  "effective  yield" for a seven-day period is its annualized
compounded  yield  during  the  period  calculated  according  to the  following
formula:

              Effective yield = (base period return + 1)365/7 - 1

For the seven-day  period ended December 31, 1998, the Money Market  Portfolio's
yield for Class O shares was _.__% and its  effective  yield was _.__%.  For the
seven-day  period ended  December 31, 1998, the Money Market  Portfolio's  yield
for the  Institutional  Class of shares  was _.__% and its  effective  yield was
_.__%.  Class T was not available on December 31, 1998;  therefore,  no yield is
presented.

         The Money Market  Portfolio also may advertise,  from time to time, its
"tax  equivalent  yield."  The tax  equivalent  yield is the  yield an  investor
would be required to obtain from taxable  investments  to equal the  Portfolio's
yield,  all or a portion of which may be exempt from federal  income taxes.  The
tax  equivalent  yield is  computed  by taking the  portion  of the  Portfolio's
effective  yield  exempt from regular  federal  income tax and  multiplying  the
exempt  yield by a factor based upon a stated  income tax rate,  then adding the
portion of the yield that is not exempt from  regular  federal  income tax.  The
factor which is used to calculate  the tax  equivalent  yield is the  reciprocal
of the difference  between 1 and the applicable  income tax rate,  which will be
stated in the  advertisement.  For the seven-day period ended December 31, 1998,
the Money Market  Portfolio's  Class O tax equivalent  yield, for an investor in
the 36% federal  income tax bracket was _.__% and, for the 39.6% federal  income
tax  bracket,  _.__%.  For the  seven-day  period ended  December 31, 1998,  the
Money  Market  Portfolio  Institutional  Class'  tax  equivalent  yield,  for an
investor  in the 36% federal  income tax  bracket  was _.__% and,  for the 39.6%
federal  income tax bracket,  _.__%.  Class T was not  available on December 31,
1998.

Limited-Term Portfolio
         From time to time,  the  Limited-Term  Portfolio  advertises its "total
return." Total return is calculated  separately for each class.  Total return is
historical in nature and is not intended to indicate future  performance.  Total
return will be quoted for the most recent  one-year  period,  five-year  period,
and period from inception of the  Portfolio's  offering of shares.  Total return
quotations  for  periods  in excess of one year  represent  the  average  annual
total return for the period included in the particular  quotation.  Total return
is a computation of the Portfolio's  dividend  yield,  plus or minus realized or
unrealized  capital  appreciation or depreciation,  less fees and expenses.  All
total return quotations  reflect the deduction of the Portfolio's  maximum sales
charge,  except  quotations of "return without maximum load" which do not deduct
the sales  charge and "actual  return,"  which  reflect  deduction  of the sales
charge only for those  periods when a sales charge was actually  imposed.  Thus,
in the formula  below,  for return  without  maximum load, P = the entire $1,000
hypothetical  initial  investment  and does not  reflect  the  deduction  of any
sales charge;  for actual return, P = a hypothetical  initial payment of $1,000.
Note:  "Total  Return"  as quoted in the  Financial  Highlights  section  of the
Fund's Prospectus and Annual Report to Shareholders, per SEC instructions,  does
not reflect  deduction of the sales charge,  and  corresponds to "return without
maximum  load" as  referred to herein.  Return  without  maximum  load should be
considered  only by investors,  such as  participants  in certain pension plans,
to whom the sales  charge does not apply,  or for  purposes of  comparison  only
with  comparable  figures  which  also do not  reflect  sales  charges,  such as
Lipper averages. Total return is computed according to the following formula:

                                P(1 + T)n = ERV

where P = a  hypothetical  initial  payment of  $1,000;  T = total  return;  n =
number  of  years;  and ERV = the  ending  redeemable  value  of a  hypothetical
$1,000  payment made at the  beginning of the 1, 5 or 10 year periods at the end
of such periods (or portions thereof, if applicable).
         Returns for the periods indicated are as follows:

                  With Max. Load        W/O Max. Load

One Year          _.__%                 _.__%
Five Years        _.__%                 _.__%
Ten Years         _.__%                 _.__%

         The  Limited-Term  Portfolio  also  advertises,  from time to time, its
"yield" and "tax  equivalent  yield." As with total  return,  both yield figures
are historical and are not intended to indicate future performance.
         Unlike the yield  quotations  for the Money Market  Portfolio,  "yield"
quotations  for  the  Limited-Term  Portfolio  refer  to the  aggregate  imputed
yield-to-maturity  of each of the  Portfolio's  investments  based on the market
value  as of the  last  day of a  given  thirty-day  or  one-month  period  less
accrued  expenses  (net of  reimbursement),  divided by the average daily number
of outstanding  shares entitled to receive  dividends times the maximum offering
price on the last day of the period  (so that the effect of the sales  charge is
included  in  the   calculation),   compounded  on  a  "bond   equivalent,"   or
semi-annual,  basis. The Limited-Term  Portfolio's  yield is computed  according
to the following formula:

                          Yield = 2[(a-b/cd)+1)6 - 1]
 
where a =  dividends  and  interest  earned  during  the  period;  b =  expenses
accrued for the period (net of  reimbursement);  c = the average daily number of
shares  outstanding  during the period that were entitled to receive  dividends;
and d = the  maximum  offering  price per  share on the last day of the  period.
Using this calculation,  the Limited-Term  Portfolio's yield for the month ended
December 31, 1998 was _.__%.
         The tax  equivalent  yield is the yield an  investor  would be required
to  obtain  from  taxable  investments  to equal  the  Limited-Term  Portfolio's
yield,  all or a portion of which may be exempt from federal  income taxes.  The
tax  equivalent  yield is  computed  for each class by taking the portion of the
yield exempt from regular  federal income tax and  multiplying  the exempt yield
by a factor  based upon a stated  income tax rate,  then  adding the  portion of
the yield that is not exempt from regular  federal  income tax. The factor which
is  used  to  calculate  the  tax  equivalent  yield  is the  reciprocal  of the
difference  between 1 and the applicable  income tax rate,  which will be stated
in the  advertisement.  For the  thirty-day  period ended December 31, 1998, the
Portfolio's  tax  equivalent  yield was _.__% for an investor in the 36% federal
income tax bracket,  and _.__% for an investor in the 39.6%  federal  income tax
bracket.

- --------------------------------------------------------------------------------
                                  ADVERTISING
- --------------------------------------------------------------------------------

         The Fund or its  affiliates  may provide  information  such as, but not
limited   to,  the   economy,   investment   climate,   investment   principles,
sociological   conditions  and  political   ambiance.   Discussion  may  include
hypothetical  scenarios  or  lists  of  relevant  factors  designed  to aid  the
investor in  determining  whether  the Fund is  compatible  with the  investor's
goals.  The Fund may list  portfolio  holdings or give  examples  or  securities
that may have been  considered for inclusion in the  Portfolio,  whether held or
not.
         The Fund or its  affiliates  may supply  comparative  performance  data
and rankings  from  independent  sources such as  Donoghue's  Money Fund Report,
Bank  Rate  Monitor,  Money,  Forbes,  Lipper  Analytical  Services,  Inc.,  CDA
Investment  Technologies,   Inc.,  Wiesenberger  Investment  Companies  Service,
Russell 2000/Small Stock Index, Mutual Fund Values Morningstar  Ratings,  Mutual
Fund Forecaster,  Barron's,  The Wall Street Journal, and Schabacker  Investment
Management,  Inc. Such averages  generally do not reflect any front- or back-end
sales charges that may be charged by Funds in that  grouping.  The Fund may also
cite to any source,  whether in print or on-line,  such as  Bloomberg,  in order
to  acknowledge  origin  of  information.  The Fund may  compare  itself  or its
portfolio holdings to other  investments,  whether or not issued or regulated by
the  securities  industry,  including,  but  not  limited  to,  certificates  of
deposit and Treasury notes.  The Fund, its Advisor,  and its affiliates  reserve
the right to update performance rankings as new rankings become available.
         Calvert Group is the nation's  leading  family of socially  responsible
mutual  funds,  both in terms of socially  responsible  mutual fund assets under
management,  and number of socially  responsible  mutual fund portfolios offered
(source:  Social  Investment Forum,  December 31, 1998).  Calvert Group was also
the first to offer a family of socially responsible mutual fund portfolios.

- --------------------------------------------------------------------------------
                             TRUSTEES AND OFFICERS
- --------------------------------------------------------------------------------

         RICHARD L. BAIRD, JR.,  Trustee.  Mr. Baird is Executive Vice President
for the Family Health Council,  Inc. in Pittsburgh,  Pennsylvania,  a non-profit
corporation which provides family planning services,  nutrition,  maternal/child
health  care,  and  various   health   screening   services.   Mr.  Baird  is  a
trustee/director  of each of the  investment  companies in the Calvert  Group of
Funds,  except for Calvert Variable Series,  Inc.,  Calvert New World Fund, Inc.
and Calvert  World  Values  Fund,  Inc.  DOB:  05/09/48.  Address:  211 Overlook
Drive, Pittsburgh, Pennsylvania 15216.
         FRANK H. BLATZ, JR., Esq.,  Trustee.  Mr. Blatz is a partner in the law
firm of Snevily,  Ely,  Williams & Blatz. He was formerly a partner with Abrams,
Blatz,  Gran,  Hendricks & Reina, P.A. He is also a director of Calvert Variable
Series,  Inc. DOB:  10/29/35.  Address:  308 East Broad Street,  Westfield,  New
Jersey 07091.
         FREDERICK T. BORTS, M.D., Trustee. Dr. Borts is a radiologist with
Kaiser Permanente. Prior to that, he was a radiologist at Bethlehem Medical
Imaging in Allentown, Pennsylvania. DOB: 07/23/49. Address: 16 Iliahi Street,
Honolulu, Hawaii, 96817.
         CHARLES E. DIEHL,  Trustee.  Mr.  Diehl is a  self-employed  consultant
and  is  Vice  President  and  Treasurer   Emeritus  of  the  George  Washington
University.  He has retired from University  Support Services,  Inc. of Herndon,
Virginia.  Formerly,  he was a Director of Acacia Mutual Life Insurance Company,
and is  currently a Director of Servus  Financial  Corporation.  DOB:  10/13/22.
Address: 1658 Quail Hollow Court, McLean, Virginia 22101.
         DOUGLAS E. FELDMAN,  M.D., Trustee.  Dr. Feldman is managing partner of
Feldman  Otolaryngology,  Head and Neck Surgery in  Washington,  D.C. A graduate
of Harvard Medical School,  he is Associate  Professor of  Otolaryngology,  Head
and Neck  Surgery at  Georgetown  University  and George  Washington  University
Medical  School,  and past Chairman of the  Department of  Otolaryngology,  Head
and Neck Surgery at the Washington  Hospital Center.  He is included in The Best
Doctors in America.  DOB:  05/23/48.  Address:  7536 Pepperell Drive,  Bethesda,
Maryland 20817.
         PETER W. GAVIAN,  CFA,  Trustee.  Mr.  Gavian is President of Corporate
Finance of  Washington,  Inc.  Formerly,  he was a  principal  of Gavian De Vaux
Associates,  an  investment  banking  firm.  He is  also a  Chartered  Financial
Analyst and an accredited senior business  appraiser.  DOB:  12/08/32.  Address:
3005 Franklin Road North, Arlington, Virginia 22201.
         JOHN G. GUFFEY,  JR.,  Trustee.  Mr.  Guffey is chairman of the Calvert
Social  Investment  Foundation,  organizing  director of the  Community  Capital
Bank  in   Brooklyn,   New  York,   and  a  financial   consultant   to  various
organizations.  In addition,  he is a director of the Community  Bankers  Mutual
Fund of Denver,  Colorado,  a director of Ariel  Funds,  and the  Treasurer  and
Director of Silby,  Guffey,  and Co.,  Inc., a venture  capital firm. Mr. Guffey
is a trustee/director  of each of the other investment  companies in the Calvert
Group of Funds,  except for Calvert Variable Series,  Inc. and Calvert New World
Fund, Inc.
        Mr.   Guffey  has  been  advised  that  the   Securities   and  Exchange
Commission  ("SEC")  has  entered an order  against  him  relating to his former
service as a director of Community  Bankers  Mutual Fund,  Inc. This fund is not
connected  with any Calvert Fund or the Calvert  Group and ceased  operations in
September,  1994.  Mr.  Guffey  consented  to the  entry  of the  order  without
admitting  or denying the  findings in the order.  The order  contains  findings
(1) that the  Community  Bankers  Mutual  Fund's  prospectus  and  statement  of
additional  information  were  materially  false  and  misleading  because  they
misstated  or failed to state  material  facts  concerning  the  pricing of fund
shares and the  percentage of illiquid  securities  in the fund's  portfolio and
that Mr.  Guffey,  as a member of the fund's  board,  should have known of these
misstatements  and therefore  violated the  Securities Act of 1933; (2) that the
price of the fund's  shares  sold to the public was not based on the current net
asset value of the shares,  in violation of the  Investment  Company Act of 1940
(the "Investment  Company Act");  and (3) that the board of the fund,  including
Mr.  Guffey,  violated the  Investment  Company Act by directing the filing of a
materially  false  registration  statement.  The order  directed  Mr.  Guffey to
cease and desist  from  committing  or causing  future  violations  and to pay a
civil  penalty  of  $5,000.  The SEC  placed  no  restrictions  on Mr.  Guffey's
continuing  to serve as a Trustee or Director of mutual  funds.  DOB:  05/15/48.
Address: 7205 Pomander Lane, Chevy Chase, Maryland 20815.
         *BARBARA J. KRUMSIEK,  President and Trustee.  Ms.  Krumsiek  serves as
President,  Chief  Executive  Officer and Vice Chairman of Calvert  Group,  Ltd.
and as an officer and  director of each of its  affiliated  companies.  She is a
director of Calvert-Sloan  Advisers,  L.L.C., and a trustee/director  of each of
the  investment  companies in the Calvert  Group of Funds.  Ms.  Krumsiek is the
President  of  each of the  investment  companies,  except  for  Calvert  Social
Investment  Fund,  of which she is the Senior Vice  President.  Prior to joining
Calvert  Group,  Ms.  Krumsiek  served as a Managing  Director of Alliance  Fund
Distributors, Inc. DOB: 08/09/52.
         M.  CHARITO  KRUVANT,  Trustee.  Ms.  Kruvant is  President  and CEO of
Creative  Associates  International,  Inc.,  a firm  that  specializes  in human
resources  development,  information  management,  public  affairs  and  private
enterprise  development.  She is also a director of Acacia Federal Savings Bank.
DOB: 12/08/45. Address: 5301 Wisconsin Avenue, N.W., Washington, D.C. 20015.
         ARTHUR J. PUGH,  Trustee.  Mr. Pugh is a Director  of Calvert  Variable
Series,  Inc.,  and serves as a director of Acacia  Federal  Savings Bank.  DOB:
09/24/37. Address: 4823 Prestwick Drive, Fairfax, Virginia 22030.
         *DAVID R. ROCHAT,  Senior Vice  President  and Trustee.  Mr.  Rochat is
Executive Vice President of Calvert Asset  Management  Company,  Inc.,  Director
and  Secretary of Grady,  Berwald and Co.,  Inc.,  and Director and President of
Chelsea  Securities,  Inc. He is the Senior  Vice  President  of First  Variable
Rate Fund,  Calvert Tax-Free  Reserves,  Calvert  Municipal Fund, Inc.,  Calvert
Cash Reserves,  and The Calvert Fund. DOB: 10/07/37.  Address:  Box 93, Chelsea,
Vermont 05038.
         *D. WAYNE SILBY,  Esq.,  Trustee.  Mr. Silby is a  trustee/director  of
each of the  investment  companies  in the  Calvert  Group of Funds,  except for
Calvert  Variable  Series,  Inc.  and  Calvert  New  World  Fund.  Mr.  Silby is
Executive  Chairman  of Group  Serve,  Inc.,  an  internet  company  focused  on
community   building   collaborative   tools,  and  an  officer,   director  and
shareholder of Silby,  Guffey & Company,  Inc.,  which serves as general partner
of Calvert  Social Venture  Partners  ("CSVP").  CSVP is a venture  capital firm
investing  in socially  responsible  small  companies.  He is also a Director of
Acacia  Mutual  Life  Insurance  Company.  DOB:  07/20/48.  Address:  1715  18th
Street, N.W., Washington, D.C. 20009.
         RENO J. MARTINI,  Senior Vice President.  Mr. Martini is a director and
Senior Vice  President of Calvert  Group,  Ltd.,  and Senior Vice  President and
Chief Investment Officer of Calvert Asset Management  Company,  Inc. Mr. Martini
is also a director  and  President  of  Calvert-Sloan  Advisers,  L.L.C.,  and a
director and officer of Calvert New World Fund, Inc. DOB: 1/13/50.
         RONALD M. WOLFSHEIMER,  CPA, Treasurer.  Mr. Wolfsheimer is Senior Vice
President  and  Chief  Financial   Officer  of  Calvert  Group,   Ltd.  and  its
subsidiaries  and an officer of each of the other  investment  companies  in the
Calvert  Group of Funds.  Mr.  Wolfsheimer  is Vice  President  and Treasurer of
Calvert-Sloan  Advisers,  L.L.C., and a director of Calvert  Distributors,  Inc.
DOB: 07/24/47.
         WILLIAM  M.  TARTIKOFF,   Esq.,  Vice  President  and  Secretary.   Mr.
Tartikoff  is an  officer of each of the  investment  companies  in the  Calvert
Group of Funds,  and is Senior Vice  President,  Secretary,  and General Counsel
of Calvert Group,  Ltd.,  and each of its  subsidiaries.  Mr.  Tartikoff is also
Vice President and Secretary of  Calvert-Sloan  Advisers,  L.L.C., a director of
Calvert  Distributors,   Inc.,  and  is  an  officer  of  Acacia  National  Life
Insurance Company. DOB: 08/12/47.
         DANIEL  K.  HAYES,  Vice  President.  Mr.  Hayes is Vice  President  of
Calvert Asset Management  Company,  Inc., and is an officer of each of the other
investment  companies  in the  Calvert  Group of Funds,  except for  Calvert New
World Fund, Inc. DOB: 09/09/50.
         SUSAN  WALKER  BENDER,  Esq.,   Assistant  Secretary.   Ms.  Bender  is
Associate  General Counsel of Calvert Group,  Ltd. and an officer of each of its
subsidiaries and Calvert-Sloan  Advisers,  L.L.C. She is also an officer of each
of the other investment companies in the Calvert Group of Funds. DOB: 01/29/59.
         KATHERINE STONER, Esq., Assistant Secretary. Ms. Stoner is Associate
General Counsel of Calvert Group and an officer of each of its subsidiaries
and Calvert-Sloan Advisers, L.L.C. She is also an officer of each of the other
investment companies in the Calvert Group of Funds. DOB: 10/21/56.
         IVY WAFFORD  DUKE,  Esq.,  Assistant  Secretary.  Ms. Duke is Assistant
Counsel  of  Calvert  Group  and an  officer  of  each of its  subsidiaries  and
Calvert-Sloan  Advisers,  L.L.C.  She is also an  officer  of each of the  other
investment  companies  in the  Calvert  Group  of  Funds.  Prior to  working  at
Calvert Group,  Ms. Duke was an Associate in the Investment  Management Group of
the Business and Finance Department at Drinker Biddle & Reath. DOB: 09/07/68.

         The address of directors  and  officers,  unless  otherwise  noted,  is
4550 Montgomery  Avenue,  Suite 1000N,  Bethesda,  Maryland 20814.  Trustees and
officers  of the Fund as a group  own  less  than 1% of the  Fund's  outstanding
shares.  Trustees  marked  with an *,  above,  are  "interested  persons" of the
Fund, under the Investment Company Act of 1940.
         Each   of   the   above    directors/trustees   and   officers   is   a
director/trustee  or officer of each of the investment  companies in the Calvert
Group of Funds with the exception of Calvert  Social  Investment  Fund, of which
only Messrs.  Baird,  Guffey and Silby and Ms.  Krumsiek are among the trustees,
Calvert Variable Series,  Inc., of which only Messrs.  Blatz, Diehl and Pugh and
Ms.  Krumsiek are among the  directors,  Calvert  World Values  Fund,  Inc.,  of
which only Messrs.  Guffey and Silby and Ms.  Krumsiek are among the  directors,
and Calvert New World Fund,  Inc.,  of which only Ms.  Krumsiek and Mr.  Martini
are among the directors.
         The Audit Committee of the Board is composed of Messrs.  Baird,  Blatz,
Feldman,  Guffey and Pugh. The Board's  Investment  Policy Committee is composed
of Messrs. Borts, Diehl, Gavian, Rochat and Silby and Ms. Krumsiek.
         During  1998,  Trustees  of the Fund  not  affiliated  with the  Fund's
Advisor were paid  $_______ and  $________ by the Money Market and  Limited-Term
Portfolios,  respectively.  Trustees of the Fund not affiliated with the Advisor
currently  receive  an annual  fee of  $20,500  for  service  as a member of the
Board of  Trustees  of the  Calvert  Group of Funds  plus a fee of $750 to $1500
for each Board and Committee  meeting  attended;  such fees are allocated  among
the Funds on the basis of their net assets.
         Trustees of the Fund not  affiliated  with the Fund's Advisor may elect
to defer  receipt of all or a  percentage  of their fees and invest  them in any
fund in the Calvert Family of Funds through the Trustees  Deferred  Compensation
Plan  (shown  as  "Pension  or  Retirement  Benefits  Accrued  as  part  of Fund
Expenses,"  below).  Deferral of the fees is designed to maintain the parties in
the same position as if the fees were paid on a current basis.

                           Trustee Compensation Table

Fiscal Year 1998      Aggregate         Pension or        Total Compensation
                      Compensation      Retirement        from Benefits
(unaudited numbers)   from Registrant   Accrued as        Registrant and Fund
                      for Service       part of           Complex paid to
                      as Trustee        of Registrant     Trustee**
                                        Expenses*

Name of Trustee

Richard L. Baird, Jr. $_____            $0                $_____
Frank H. Blatz, Jr.   $_____            $0                $_____
Frederick T. Borts    $_____            $0                $_____
Charles E. Diehl      $_____            $_____            $_____
Douglas E. Feldman    $_____            $0                $_____
Peter W. Gavian       $_____            $_____            $_____
John G. Guffey, Jr.   $_____            $0                $_____
M. Charito Kruvant    $_____            $_____            $_____
Arthur J. Pugh        $_____            $_____            $_____
D. Wayne Silby        $_____            $0                $_____

*Messrs. Blatz, Diehl, Gavian and Pugh have chosen to defer a portion of their
compensation. As of December 31, 1998, total deferred compensation, including
dividends and capital appreciation, was $_________,$_________, $_________ and
$_________, for each trustee, respectively.
**As of December 31, 1998. The Fund Complex consists of nine (9) registered
investment companies.

- --------------------------------------------------------------------------------
                               INVESTMENT ADVISOR
- --------------------------------------------------------------------------------

         The Fund's  Investment  Advisor is Calvert  Asset  Management  Company,
Inc.,  4550  Montgomery  Avenue,  Suite  1000N,  Bethesda,   Maryland  20814,  a
subsidiary of Calvert Group,  Ltd.,  which is a subsidiary of Acacia Mutual Life
Insurance Company of Washington, D.C. ("Acacia Mutual").
         The Advisory  Contract  between the Fund and the Advisor will remain in
effect  indefinitely,  provided continuance is approved at least annually by the
vote of the holders of a majority of the  outstanding  shares of the Fund, or by
the Trustees of the Fund;  and further  provided that such  continuance  is also
approved  annually  by the vote of a majority  of the  Trustees  of the Fund who
are not parties to the Contract or interested  persons of such parties,  cast in
person at a meeting  called  for the  purpose  of voting on such  approval.  The
Contract  may be  terminated  without  penalty by either party on 60 days' prior
written notice; it automatically terminates in the event of its assignment.
         Under  the   Contract,   the  Advisor   manages  the   investment   and
reinvestment  of the Fund's assets,  subject to the direction and control of the
Fund's Board of Trustees.  For its services,  the Advisor receives an annual fee
of:
         i) with  respect  to the  Money  Market  Portfolio,  prior to August 1,
1997,  the fees  were  0.50%  of the  first  $500  million  of such  Portfolio's
average  daily net assets,  0.45% of the next $500 million of such  assets,  and
0.40% of all such  assets over $1 billion.  Effective  August 1, 1997,  the fees
changed to 0.25% of the first $500  million of such  Portfolio's  average  daily
net  assets,  0.20% of the next $500  million of such  assets,  and 0.15% of all
such assets over $1 billion; and
         ii) with  respect  to the  Limited-Term  Portfolio,  0.60% of the first
$500  million of the  Portfolio's  average  daily net assets,  0.50% of the next
$500 million of such assets, and 0.40% of all such assets over $1 billion.
         The advisory  fee is payable  monthly.  The Advisor  reserves the right
(i) to waive all or a part of its fee and (ii) to  compensate,  at its  expense,
broker-dealers  in  consideration  of  their   promotional  and   administrative
services.
         The Advisor  provides  the Fund with  investment  advice and  research,
pays the salaries and fees of all  Trustees and  executive  officers of the Fund
who are  principals  of the  Advisor,  and pays  certain  Fund  advertising  and
promotional  expenses.  The Fund pays all  other  administrative  and  operating
expenses,   including:   custodial   fees;   shareholder   servicing,   dividend
disbursing and transfer agency fees;  administrative  service fees;  federal and
state  securities  registration  fees;  insurance  premiums;  trade  association
dues;  interest,  taxes and other  business  fees;  legal  and audit  fees;  and
brokerage  commissions and other costs  associated with the purchase and sale of
portfolio securities.
         The   Advisor  may   voluntarily   reimburse   the  Money   Market  and
Limited-Term  Portfolios  for  expenses.  The  advisory  fees  paid by the Money
Market   Portfolio  to  Calvert  Asset   Management   Company  were  $7,776,716,
$5,409,090,  and $_________ for years 1996,  1997, and 1998,  respectively.  The
advisory fees paid by the  Limited-Term  Portfolio to Calvert  Asset  Management
Company were $3,110,764,  $3,164,772,  and $__________ for years 1996, 1997, and
1998, respectively.

- --------------------------------------------------------------------------------
                            ADMINISTRATIVE SERVICES
- --------------------------------------------------------------------------------

         Calvert  Administrative   Services  Company  ("CASC"),  a  wholly-owned
subsidiary  of Calvert  Group,  Ltd.,  has been  retained by the Fund to provide
certain  administrative   services  necessary  to  the  conduct  of  the  Fund's
affairs.  Such services  include the  preparation  of corporate  and  regulatory
reports and filings,  portfolio  accounting,  and the daily determination of net
investment  income and net asset value per share.  Prior to August 1, 1997, CASC
received a fee of  $200,000  per year for  providing  such  services,  allocated
among  Portfolios  based on assets.  Effective  August 1, 1997, the Money Market
Class O,  Institutional  Class,  and Class T pay annual  rates of 0.26%,  0.05%,
and ___%  respectively,  based on average  daily net  assets.  Limited-Term  and
other  portfolios  of CTFR pay an annual  fee of  $80,000,  allocated  among the
portfolios  based on average  daily net  assets.  The  service  fees paid by the
Money  Market  Portfolio  to  Calvert   Administrative   Services  Company  were
$128,255 for fiscal year 1996.  The 1997  administrative  services  fees paid by
CTFR  Money   Market   were   $1,682,754   and  $24,010  for  Class  O  and  the
Institutional Class,  respectively.  The 1998 administrative  services fees paid
by  CTFR  Money  Market  were  $1,682,754  and  $24,010  for  Class  O  and  the
Institutional  Class,  respectively.  Class T was not  available  during  fiscal
year 1998.  The service  fees paid by the  Limited-Term  Portfolio  to CASC were
$38,242, $43,210, and $_________, for years 1996, 1997, and 1998, respectively.

- --------------------------------------------------------------------------------
                   TRANSFER AND SHAREHOLDER SERVICING AGENTS
- --------------------------------------------------------------------------------

         National  Financial  Data  Services,  Inc.  ("NFDS"),  a subsidiary  of
State  Street  Bank & Trust,  has been  retained  by the Fund to act as transfer
agent  and  dividend   disbursing   agent.   These   responsibilities   include:
responding  to certain  shareholder  inquiries and  instructions,  crediting and
debiting  shareholder  accounts for purchases and redemptions of Fund shares and
confirming  such  transactions,  and daily updating of  shareholder  accounts to
reflect declaration and payment of dividends.
         Calvert  Shareholder  Services,  Inc., a subsidiary  of Calvert  Group,
Ltd.,  and Acacia  Mutual,  has been retained by the Fund to act as  shareholder
servicing agent.  Shareholder servicing  responsibilities  include responding to
shareholder inquiries and instructions  concerning their accounts,  entering any
telephoned  purchases  or  redemptions  into the  NFDS  system,  maintenance  of
broker-dealer  data, and preparing and  distributing  statements to shareholders
regarding  their  accounts.  Calvert  Shareholder  Services,  Inc.  was the sole
transfer agent prior to January 1, 1998.
         For  these  services,  NFDS  and  Calvert  Shareholder  Services,  Inc.
receive  a fee based on the  number  of  shareholder  accounts  and  shareholder
transactions, per Portfolio.

- --------------------------------------------------------------------------------
                     INDEPENDENT ACCOUNTANTS AND CUSTODIANS
- --------------------------------------------------------------------------------

         PricewaterhouseCoopers,  L.L.P.  has  been  selected  by the  Board  of
Trustees  to serve as  independent  accountants  for  fiscal  year  1999.  State
Street Bank & Trust  Company,  N.A.,  225  Franklin  Street,  Boston,  MA 02110,
currently  serves as custodian of the  Portfolio's  investments.  First National
Bank of  Maryland,  25 South  Charles  Street,  Baltimore,  Maryland  21203 also
serves  as  custodian  of  certain  of  the  Portfolio's  cash  assets.  Neither
custodian has any part in deciding the  Portfolio's  investment  policies or the
choice of securities that are to be purchased or sold for the Portfolio.

- --------------------------------------------------------------------------------
                             METHOD OF DISTRIBUTION
- --------------------------------------------------------------------------------

         The  Portfolios  have entered into a principal  underwriting  agreement
with Calvert  Distributors Inc. ("CDI").  Pursuant to the agreement,  CDI serves
as distributor and principal  underwriter  for the  Portfolios.  Under the terms
of the  agreement,  CDI is entitled  to receive a service  fee and  distribution
fee from the Money  Market  Portfolio,  paid  through the  Distribution  Plan of
Class T.
         Pursuant  to Rule  12b-1  under  the  1940  Act,  Class T of the  Money
Market  Portfolio has adopted a Distribution  Plan (the "Plan") which permits it
to pay certain  expenses  associated with the  distribution and servicing of its
shares.  Such expenses may not exceed, on an annual basis,  0.25% of the average
daily net assets of Class T.
         The   Distribution   Plan  was  approved  by  the  Board  of  Trustees,
including  the  Trustees who are not  "interested  persons" of the Fund (as that
term is  defined in the 1940 Act) and who have no direct or  indirect  financial
interest  in the  operation  of the  Plan or in any  agreements  related  to the
Plan.  The  selection  and  nomination  of the Trustees  who are not  interested
persons is  committed  to the  discretion  of such  disinterested  Trustees.  In
establishing  the Plan, the Trustees  considered  various factors  including the
amount of the  distribution  expenses.  The Trustees  determined that there is a
reasonable likelihood that the Plan will benefit Class T and its shareholders.
         The   Plan  may  be   terminated   by  vote  of  a   majority   of  the
non-interested  Trustees  who have no direct or indirect  financial  interest in
the Plan,  or by vote of a majority of the  outstanding  shares of the  affected
class or Portfolio.  Any change in the Plan that would  materially  increase the
cost to the affected Class of Portfolio  requires  approval of the  shareholders
of that class; otherwise,  the Plan may be amended by the Trustees,  including a
majority  of the  non-interested  Trustees  as  described  above.  The Plan will
continue  in  effect  for   successive   one-year   terms   provided  that  such
continuance  is  specifically  approved  by (i) the  vote of a  majority  of the
Trustees  who are not  parties  to the Plan or  interested  persons  of any such
party and who have no direct or indirect  financial  interest  in the Plan,  and
(ii) the vote of a majority of the entire Board of Trustees.
         Apart from the Plan,  the Advisor and CDI,  at their own  expense,  may
incur costs and pay expenses  associated with the  distribution of shares of the
Money Market Portfolio.
         Prior  to the  termination  of  Class C  shares  for the  Limited  Term
Portfolio,  CDI was  entitled to receive a service fee and a  distribution  fee,
payable monthly pursuant to the Limited-Term  Portfolio's  Distribution Plan, of
0.25%,  respectively,  of the  Portfolio's  average  daily net assets.  CDI also
receives all sales  charges  imposed on  Limited-Term  Portfolio  Class A shares
and  compensates   broker-dealer   firms  for  sales  of  shares  at  a  maximum
commission  rate of  1.50%,  as  specified  in the  table  of  applicable  sales
charges (see "Alternative Sales Options" in the Prospectus).
         For the fiscal  years ended  December  31, 1996,  1997,  and 1998,  CDI
received  sales  charges  in excess of the  dealer  reallowance  of $0,  $0, and
$_______,  respectively.  CDI paid $48,520,  $101,072,  and $______, in addition
to commissions  charged on sales of Limited-Term  Portfolio  during fiscal years
1996, 1997, and 1998, respectively.

- --------------------------------------------------------------------------------
                             PORTFOLIO TRANSACTIONS
- --------------------------------------------------------------------------------

         Portfolio   transactions   are   undertaken   on  the  basis  of  their
desirability  from  an  investment  standpoint.  Investment  decisions  and  the
choice  of  brokers  and  dealers  are  made by the  Fund's  Advisor  under  the
direction and supervision of the Fund's Board of Trustees.
         For the fiscal years ended  December 31, 1997 and 1998,  the  portfolio
turnover rates of the  Limited-Term  Portfolio  were 52% and __%,  respectively.
Broker-dealers  who execute  portfolio  transactions  on behalf of  Limited-Term
are  selected on the basis of their  professional  capability  and the value and
quality of their  services.  The Advisor  reserves the right to place orders for
the purchase or sale of portfolio  securities with  broker-dealers who have sold
shares of Limited-Term or who provide  Limited-Term with statistical,  research,
or other  information and services.  Although any statistical  research or other
information  and  services  provided  by  broker-dealers  may be  useful  to the
Advisor,  the  dollar  value  of such  information  and  services  is  generally
indeterminable,  and its  availability  or receipt does not serve to  materially
reduce the Advisor's  normal  research  activities or expenses.  In fiscal years
1996,  1997,  and 1998,  no  commissions  were paid to any  officer,  trustee or
Advisory  Council  member  of the  Fund  or any of  their  affiliates.  For  the
Limited-Term  Portfolio,  1996, 1997, and 1998, aggregate brokerage  commissions
paid to broker-dealers were $48,520, $0, and $_____, respectively.
         The Advisor may also  execute  portfolio  transactions  with or through
broker-dealers  who have sold shares of Limited-Term.  However,  such sales will
not be a qualifying or disqualifying  factor in a broker-dealer's  selection nor
will the selection of any  broker-dealer  be based on the volume of Limited-Term
shares sold. The Advisor may  compensate,  at its expense,  such  broker-dealers
in consideration of their promotional and administrative services.

- --------------------------------------------------------------------------------
                              GENERAL INFORMATION
- --------------------------------------------------------------------------------

         The Fund was  organized as a  Massachusetts  business  trust on October
20,  1980.  The  other  series  of the Fund  include  the  Long-Term  Portfolio,
California Money Market  Portfolio,  and the Vermont  Municipal  Portfolio.  The
Fund's  Declaration  of Trust  contains  an express  disclaimer  of  shareholder
liability  for  acts  or  obligations  of  the  Fund.  The   shareholders  of  a
Massachusetts  business trust might, however,  under certain  circumstances,  be
held  personally  liable as partners for its  obligations.  The  Declaration  of
Trust provides for  indemnification  and  reimbursement  of expenses out of Fund
assets for any shareholder  held personally  liable for obligations of the Fund.
The  Declaration  of Trust  provides that the Fund shall,  upon request,  assume
the  defense  of  any  claim  made  against  any  shareholder  for  any  act  or
obligation  of the Fund and satisfy any judgment  thereon.  The  Declaration  of
Trust further  provides that the Fund may maintain  appropriate  insurance  (for
example,   fidelity  bonding  and  errors  and  omissions   insurance)  for  the
protection of the Fund, its shareholders,  Trustees,  officers,  employees,  and
agents  to  cover  possible  tort and  other  liabilities.  Thus,  the risk of a
shareholder  incurring  financial  loss on account of  shareholder  liability is
limited to  circumstances  in which  both  inadequate  insurance  exists and the
Fund itself is unable to meet its obligations.
         Each share of each series  represents an equal  proportionate  interest
in that  series with each other  share and is  entitled  to such  dividends  and
distributions  out of the income  belonging  to such  series as  declared by the
Board.  The Money  Market  Portfolio  offers  Class O  (offered  in the  Calvert
Tax-Free Reserves Money Market  Prospectus),  the  Institutional  Class (offered
in a separate prospectus),  and Class T (offered in a separate prospectus).  The
three classes  represent  interests in the same portfolio of investments and are
identical in all respects,  except:  (a) the classes may have different transfer
agency fees;  (b) postage and delivery,  printing and  stationery  expenses will
be  separately  allocated;  and (c) the  classes  will have  different  dividend
rates due  solely to the  effects of (a) and (b)  above.  Each class  represents
interests in the same  portfolio of  investments.  Upon any  liquidation  of the
Funds,  shareholders  of each  class are  entitled  to share pro rata in the net
assets belonging to that series available for distribution.
         General costs,  expenses,  and liabilities of the Fund  attributable to
a  particular  Portfolio  are  borne by that  Portfolio;  costs,  expenses,  and
liabilities  not  attributable to a particular  Portfolio are allocated  between
the  Fund's  Portfolios  on the  basis  of the  respective  net  assets  of each
Portfolio.
         The Portfolios will send their shareholders  unaudited  semi-annual and
audited  annual  reports that will include the  Portfolios'  net asset value per
share,   portfolio  securities,   income  and  expenses,   and  other  financial
information.
         This  Statement  of  Additional  Information  does not  contain all the
information in the Fund's  registration  statement.  The registration  statement
is on file with the Securities  and Exchange  Commission and is available to the
public.

- --------------------------------------------------------------------------------
              CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES
- --------------------------------------------------------------------------------

         As of January 15, 1999, the following  shareholders  owned of record 5%
or more of the Class or Portfolio shown:

         Name and Address                        % of Ownership

         (insert info)                           __.__%

- --------------------------------------------------------------------------------
                                    APPENDIX
- --------------------------------------------------------------------------------

Municipal Obligations
         Municipal  obligations are debt obligations  issued by states,  cities,
municipalities,   and  their   agencies  to  obtain  funds  for  various  public
purposes.  Such  purposes  include  the  construction  of a wide range of public
facilities,  the refunding of  outstanding  obligations,  the obtaining of funds
for  general  operating  expenses,  and the  lending  of funds  to other  public
institutions   and  facilities.   In  addition,   certain  types  of  industrial
development  bonds are  issued by or on behalf of public  authorities  to obtain
funds  for  many  types of  local,  privately  operated  facilities.  Such  debt
instruments  are considered  municipal  obligations if the interest paid on them
is  exempt  from  federal  income  tax in the  opinion  of bond  counsel  to the
issuer.  Although the interest paid on the proceeds from private  activity bonds
used  for the  construction,  equipment,  repair  or  improvement  of  privately
operated  industrial or commercial  facilities may be exempt from federal income
tax,  current  federal  tax law places  substantial  limitations  on the size of
such issues.
         Municipal  obligations  are  generally  classified  as either  "general
obligation" or "revenue''  bonds.  General  obligation  bonds are secured by the
issuer's  pledge of its  faith,  credit  and  taxing  power for the  payment  of
principal  and  interest.  Revenue  bonds are payable from the revenues  derived
from a particular  facility or class of facilities  or, in some cases,  from the
proceeds  of a special  excise tax or other  specific  revenue  source,  but not
from the general taxing power.  Tax-exempt  industrial  development bonds are in
most cases  revenue  bonds and do not  generally  carry the pledge of the credit
of the issuing  municipality.  There are, of course,  variations in the security
of  municipal  obligations,  both within a particular  classification  and among
classifications.
         Municipal  obligations  are  generally  traded on the basis of a quoted
yield to maturity,  and the price of the  security is adjusted so that  relative
to the stated rate of interest it will return the quoted rate to the purchaser.
         Short-term  and   limited-term   municipal   obligations   include  Tax
Anticipation  Notes,   Revenue  Anticipation  Notes,  Bond  Anticipation  Notes,
Construction   Loan  Notes,   and  Discount  Notes.   The  maturities  of  these
instruments  at the time of issue  generally will range between three months and
one year.  Pre-Refunded  Bonds with longer nominal maturities that are due to be
retired with the proceeds of an escrowed  subsequent  issue at a date within one
year and three years of the time of acquisition are also  considered  short-term
and limited-term municipal obligations.

Municipal Bond and Note Ratings
Description  of  Moody's  Investors   Service,   Inc.'s  ratings  of  state  and
municipal notes:
         Moody's  ratings  for state and  municipal  notes and other  short-term
obligations are designated  Moody's  Investment Grade ("MIG").  This distinction
is in  recognition  of  the  differences  between  short-term  credit  risk  and
long-term risk.
         MIG  1:  Notes  bearing  this  designation  are of  the  best  quality,
enjoying  strong  protection  from  established  cash  flows of funds  for their
servicing  or  from  established  and  broad-based  access  to  the  market  for
refinancing, or both.
         MIG2:  Notes  bearing  this  designation  are  of  high  quality,  with
margins of protection ample although not so large as in the preceding group.
         MIG3:  Notes bearing this  designation are of favorable  quality,  with
all security elements  accounted for but lacking the undeniable  strength of the
preceding  grades.  Market access for refinancing,  in particular,  is likely to
be less well established.
         MIG4:  Notes  bearing  this   designation  are  of  adequate   quality,
carrying  specific risk but having  protection  commonly regarded as required of
an investment security and not distinctly or predominantly speculative.

Description of Moody's  Investors  Service  Inc.'s/Standard  & Poor's  municipal
bond ratings:
         Aaa/AAA:  Best  quality.  These  bonds  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.  This rating  indicates an extremely strong capacity to pay
principal and interest.
         Aa/AA:  Bonds rated AA also qualify as high-quality  debt  obligations.
Capacity to pay  principal  and interest is very strong,  and in the majority of
instances  they  differ  from AAA issues  only in small  degree.  They are rated
lower than the best bonds because  margins of protection  may not be as large as
in  Aaa  securities,  fluctuation  of  protective  elements  may  be of  greater
amplitude,  or there may be other elements  present which make  long-term  risks
appear somewhat larger than in Aaa securities.
         A/A:  Upper-medium  grade  obligations.   Factors  giving  security  to
principal  and interest  are  considered  adequate,  but elements may be present
which  make the  bond  somewhat  more  susceptible  to the  adverse  effects  of
circumstances and economic conditions.
         Baa/BBB:  Medium grade obligations;  adequate capacity to pay principal
and interest.  Whereas they normally  exhibit  adequate  protection  parameters,
adverse economic  conditions or changing  circumstances  are more likely to lead
to a  weakened  capacity  to pay  principal  and  interest  for  bonds  in  this
category than for bonds in the A category.
         Ba/BB,  B/B,  Caa/CCC,   Ca/CC:  Debt  rated  in  these  categories  is
regarded as  predominantly  speculative with respect to capacity to pay interest
and  repay  principal.  There may be some  large  uncertainties  and major  risk
exposure  to adverse  conditions.  The higher  the  degree of  speculation,  the
lower the rating.
         C/C: This rating is only for no-interest income bonds.
         D:  Debt  in  default;  payment  of  interest  and/or  principal  is in
arrears.

<PAGE>

                                LETTER OF INTENT

                           
Date

Calvert Distributors, Inc.
4550 Montgomery Avenue
Bethesda, MD 20814

Ladies and Gentlemen:

         By signing this Letter of Intent, or affirmatively marking the Letter
of Intent option on my Fund Account Application Form, I agree to be bound by
the terms and conditions applicable to Letters of Intent appearing in the
Prospectus and the Statement of Additional Information for the Fund and the
provisions described below as they may be amended from time to time by the
Fund. Such amendments will apply automatically to existing Letters of Intent.

         I intend to invest in the shares of:____________________________
(Fund or Portfolio name) during the thirteen (13) month period from the date
of my first purchase pursuant to this Letter (which cannot be more than ninety
(90) days prior to the date of this Letter or my Fund Account Application
Form, whichever is applicable), an aggregate amount (excluding any
reinvestments of distributions) of at least fifty thousand dollars ($50,000)
which, together with my current holdings of the Fund (at public offering price
on date of this Letter or my Fund Account Application Form, whichever is
applicable), will equal or exceed the amount checked below:

         __ $50,000 __ $100,000 __ $250,000 __ $500,000 __ $1,000,000

         Subject to the conditions specified below, including the terms of
escrow, to which I hereby agree, each purchase occurring after the date of
this Letter will be made at the public offering price applicable to a single
transaction of the dollar amount specified above, as described in the Fund's
prospectus. "Fund" in this Letter of Intent shall refer to the Fund or
Portfolio, as the case may be. No portion of the sales charge imposed on
purchases made prior to the date of this Letter will be refunded.

         I am making no commitment to purchase shares, but if my purchases
within thirteen months from the date of my first purchase do not aggregate the
minimum amount specified above, I will pay the increased amount of sales
charges prescribed in the terms of escrow described below. I understand that
4.75% of the minimum dollar amount specified above will be held in escrow in
the form of shares (computed to the nearest full share). These shares will be
held subject to the terms of escrow described below.

         From the initial purchase (or subsequent purchases if necessary),
4.75% of the dollar amount specified in this Letter shall be held in escrow in
shares of the Fund by the Fund's transfer agent. For example, if the minimum
amount specified under the Letter is $50,000, the escrow shall be shares
valued in the amount of $2,375 (computed at the public offering price adjusted
for a $50,000 purchase). All dividends and any capital gains distribution on
the escrowed shares will be credited to my account.

         If the total minimum investment specified under the Letter is
completed within a thirteen month period, escrowed shares will be promptly
released to me. However, shares disposed of prior to completion of the
purchase requirement under the Letter will be deducted from the amount
required to complete the investment commitment.

         Upon expiration of this Letter, the total purchases pursuant to the
Letter are less than the amount specified in the Letter as the intended
aggregate purchases, Calvert Distributors, Inc. ("CDI") will bill me for an
amount equal to the difference between the lower load I paid and the dollar
amount of sales charges which I would have paid if the total amount purchased
had been made at a single time. If not paid by the investor within 20 days,
CDI will debit the difference from my account. Full shares, if any, remaining
in escrow after the aforementioned adjustment will be released and, upon
request, remitted to me.

         I irrevocably constitute and appoint CDI as my attorney-in-fact, with
full power of substitution, to surrender for redemption any or all escrowed
shares on the books of the Fund. This power of attorney is coupled with an
interest.

         The commission allowed by CDI to the broker-dealer named herein shall
be at the rate applicable to the minimum amount of my specified intended
purchases.

         The Letter may be revised upward by me at any time during the
thirteen-month period, and such a revision will be treated as a new Letter,
except that the thirteen-month period during which the purchase must be made
will remain unchanged and there will be no retroactive reduction of the sales
charges paid on prior purchases.

         In determining the total amount of purchases made hereunder, shares
disposed of prior to termination of this Letter will be deducted. My
broker-dealer shall refer to this Letter of Intent in placing any future
purchase orders for me while this Letter is in effect.


                                                     
Dealer

                                                     
Name of Investor(s)

By                                                   
     Authorized Signer

                                                     
Address

                                                     
Signature of Investor(s)

                                                     
Date

                                                     
Signature of Investor(s)

                                                     
Date

<PAGE>

PART C. OTHER INFORMATION


Item 23. Exhibits

                  1. Declaration of Trust (incorporated by reference to
                  Registrant's Initial Registration Statement,
                  October 20, 1980).

                  2. By-Laws (incorporated by reference to Registrant's
                  Initial Registration Statement, October 20,
                  1980).

                  4. Specimen Stock Certificate for the Vermont Municipal
                  Portfolio (incorporated by reference to
                  Registrant's Post-Effective Amendment No. 29,
                  August 30, 1991); for the Limited-Term
                  Portfolio, Long-Term Portfolio, and all other
                  Portfolios (except Vermont Municipal),
                  (incorporated by reference to Registrant's
                  Post-Effective Amendment No. 32, January 29,
                  1993).

                  5. Advisory Contract (incorporated by reference to
                  Registrant's Post-Effective Amendment No. 29,
                  August 30, 1991).

                  6. Underwriting Agreement, (incorporated by reference to
                  Registrant's Post-Effective Amendment No. 45,
                  April __, 1998).

                  7. Trustees' Deferred Compensation Agreement (incorporated
                  by reference to Registrant's Post-Effective
                  Amendment No. 30, January 31, 1992).

                  8. Custodial Contract (with respect to all Portfolios
                  except Vermont Municipal Portfolio,
                  (incorporated by reference to Registrant's
                  Post-Effective Amendment No. 34, November 30,
                  1993); with respect to Vermont Municipal
                  Portfolio, (incorporated by reference to
                  Registrant's Post-Effective Amendment No. 31,
                  April 30, 1992).

                  9.a. Transfer Agency Contract and Shareholder Servicing
                  Contract, (incorporated by reference to Registrant's
                  Post-Effective Amendment No. 45, April __, 1998).

                  9.b. Administrative Services Agreement
                  (incorporated by reference to Registrant's
                  Post-Effective Amendment No. 15, January 30,
                  1989).

                  10. Opinion and Consent of Counsel as to Legality
                  of Shares Being Registered.

                  15. Plan of Distribution for the Class A Shares of
                  the Long-Term Portfolio, (incorporated by
                  reference to Registrant's Post-Effective
                  Amendment No. 5, September 13, 1983; with
                  respect to Class A Shares of the Vermont
                  Municipal Portfolio, the Plan of Distribution
                  was terminated, and the termination was
                  ratified by the Fund Trustees on November 6,
                  1991; for the Class B and C shares of the
                  Limited-Term, Long-Term, and Vermont
                  Portfolios, (incorporated by reference to
                  Registrant's Post-Effective Amendment No. 45,
                  April __, 1998).

                  16. Schedule for Computation of Performance
                  Quotation (with respect to the Money Market,
                  Limited-Term and Long-Term Portfolios,
                  incorporated by reference to Registrant's
                  Post-Effective Amendment No. 14, filed March
                  1, 1988; with respect to the Calvert Cash
                  Reserves Tax-Free Portfolio, incorporated by
                  reference to Registrant's Post-Effective
                  Amendment No. 15, filed January 30, 1989; with
                  respect to the California Money Market
                  Portfolio, incorporated by reference to
                  Registrant's Post-Effective Amendment No. 22,
                  filed October 29, 1990; with respect to the
                  New Jersey Money Market Portfolio and Vermont
                  Municipal Portfolio, incorporated by reference
                  to Registrant's Post-Effective Amendment No.
                  29, August 30, 1991).

Item 24. Persons Controlled By or Under Common Control With Registrant

Not applicable.

Item 26. Business and Other Connections of Investment Adviser

                           Name of Company, Principal
Name                       Business and Address                   Capacity


Barbara J. Krumsiek        Calvert Variable Series, Inc.          Officer
                           Calvert Municipal Fund, Inc.            and
                           Calvert World Values Fund, Inc.        Director

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income                      and
                           Calvert Tax-Free Reserves              Trustee
                           Calvert Social Investment Fund
                           Calvert Cash Reserves
                           The Calvert Fund

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor                      and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company                         and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent                          and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company                        and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer                           and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert-Sloan Advisers, LLC            Director
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert New World Fund, Inc.           Director
                           Investment Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           --------------
                           Alliance Capital Mgmt. L.P.      Sr. Vice President
                           Mutual Fund Division                   Director
                           1345 Avenue of the Americas
                           New York, NY 10105
                           --------------

Ronald M. Wolfsheimer      First Variable Rate Fund               Officer
                            for Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           --------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company                         and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Distributors, Inc.             Director
                           Broker-Dealer                           and
                           4550 Montgomery Avenue                 Officer
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

David R. Rochat            First Variable Rate Fund               Officer
                            for Government Income                  and
                           Calvert Tax-Free Reserves              Trustee
                           Calvert Cash Reserves
                           The Calvert Fund

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Municipal Fund, Inc.           Officer
                           Investment Company                      and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor                      and
                           4550 Montgomery Avenue                 Director
                           Bethesda, Maryland 20814
                           ---------------
                           Chelsea Securities, Inc.               Officer
                           Securities Firm                         and
                           Post Office Box 93                     Director
                           Chelsea, Vermont 05038
                           ---------------
                           Grady, Berwald & Co.                   Officer
                           Holding Company                         and
                           43A South Finley Avenue                Director
                           Basking Ridge, NJ 07920
                           ---------------

Reno J. Martini            Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           First Variable Rate Fund               Officer
                            for Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert New World Fund, Inc.           Director
                           Investment Company                      and
                           4550 Montgomery Avenue                 Officer
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert-Sloan Advisers, LLC            Director
                           Investment Advisor                      and
                           4550 Montgomery Avenue                 Officer
                           Bethesda, Maryland 20814
                           ---------------

Charles T. Nason           Acacia Mutual Life Insurance           Officer
                           Acacia National Life Insurance         and Director

                           Insurance Companies
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Financial Corporation           Officer
                           Holding Company                         and
                           7315 Wisconsin Avenue                  Director
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Federal Savings Bank            Director
                           Savings Bank
                           7600-B Leesburg Pike
                           Falls Church, Virginia 22043
                           ---------------
                           Enterprise Resources, Inc.             Director
                           Business Support Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Realty Square, L.L.C.           Director
                           Realty Investments
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Gardner Montgomery Company             Director
                           Tax Return Preparation Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Director
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Director
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Director
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Shareholder Services, Inc.     Director
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Social Investment Fund         Trustee
                           Investment Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           -----------------
                           The Advisors Group, Ltd.               Director
                           Broker-Dealer and
                           Investment Advisor
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------

Robert-John H.             Acacia National Life Insurance         Officer
 Sands                     Insurance Company                       and
                           7315 Wisconsin Avenue                  Director
                           Bethesda, Maryland 20814
                           ----------------
                           Acacia Mutual Life Insurance           Officer
                           Insurance Company
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Acacia Financial Corporation           Officer
                           Holding Company                         and
                           7315 Wisconsin Avenue                  Director
                           Bethesda, Maryland 20814
                           ----------------
                           Acacia Federal Savings Bank            Officer
                           Savings Bank
                           7600-B Leesburg Pike
                           Falls Church, Virginia 22043
                           ---------------
                           Enterprise Resources, Inc.             Director
                           Business Support Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Acacia Realty Square, L.L.C.           Director
                           Realty Investments
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Gardner Montgomery Company             Director
                           Tax Return Preparation Services
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           The Advisors Group, Ltd.               Director
                           Broker-Dealer and
                           Investment Advisor
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Director
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Director
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management, Co., Inc.    Director
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Shareholder Services, Inc.     Director
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

William M. Tartikoff       Acacia National Life Insurance         Officer
                           Insurance Company
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative                 Officer
                           Services Company
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co. Inc.      Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Director
                           Broker-Dealer                           and
                           4550 Montgomery Avenue                 Officer
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------

Susan Walker Bender        Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

Katherine Stoner           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

Ivy Wafford Duke           Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert-Sloan Advisers, LLC            Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.
                           Calvert New World Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------

Daniel K. Hayes            Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------
                           First Variable Rate Fund for           Officer
                            Government Income
                           Calvert Tax-Free Reserves
                           Calvert Cash Reserves
                           Calvert Social Investment Fund
                           The Calvert Fund
                           Calvert Variable Series, Inc.
                           Calvert Municipal Fund, Inc.
                           Calvert World Values Fund, Inc.

                           Investment Companies
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

Steve Van Order            Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

John Nichols               Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

David Leach                Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------

Matthew D. Gelfand         Calvert Asset Management               Officer
                           Company, Inc.
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ------------------
                           Strategic Investment Management        Officer
                           Investment Advisor
                           1001 19th Street North
                           Arlington, Virginia 20009
                           ------------------

Item 27. Principal Underwriters

         (a)      Registrant's principal underwriter also underwrites
shares of First Variable Rate Fund for Government Income, Calvert
Tax-Free Reserves, Calvert Social Investment Fund, Calvert Cash Reserves,
Calvert Municipal Fund, Inc., Calvert World Values Fund, Inc.,
Calvert New World Fund, Inc., and Calvert Variable Series, Inc.

         (b)      Positions of Underwriter's Officers and Directors

Name and Principal         Position(s) with               Position(s) with
Business Address           Underwriter                    Registrant

Barbara J. Krumsiek        Director and President         President and Trustee

Ronald M. Wolfsheimer      Director, Senior Vice          Treasurer
                           President and Chief Financial Officer

William M. Tartikoff       Director, Senior Vice          Vice President and
                           President and Secretary        Secretary

Craig Cloyed               Senior Vice President          None

Karen Becker               Vice President, Operations     None

Steve Cohen                Vice President                 None

Geoffrey Ashton            Regional Vice President        None

Martin Brown               Regional Vice President        None

Janet Haley                Regional Vice President        None

Ben Ogbogu                 Regional Vice President        None

Susan Walker Bender        Assistant Secretary            Assistant Secretary

Katherine Stoner           Assistant Secretary            Assistant Secretary

Ivy Wafford Duke           Assistant Secretary            Assistant Secretary

         (c)      Inapplicable.


Item 28. Location of Accounts and Records

         Ronald M. Wolfsheimer, Treasurer
         and
         William M. Tartikoff, Assistant Secretary
 
         4550 Montgomery Avenue, Suite 1000N
         Bethesda, Maryland 20814

Item 29.  Management Services

         Not Applicable

Item 32.  Undertakings

         Not Applicable

         SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and
the Investment Company Act of 1940, the Registrant certifies that it
has duly caused this registration statement to be signed on its behalf
by the undersigned, thereto duly authorized in the City of Bethesda, and
State of Maryland, on the 14th day of January, 1999.

         CALVERT TAX-FREE RESERVES

         By:
         _________________**_________________
         Barbara J. Krumsiek
         President and Trustee

         SIGNATURES

Pursuant to the requirements of the Securities Act of 1933,
this Registration Statement has been signed below by the following
persons in the capacities indicated.


Signature                           Title                     Date


__________**____________            President and             1/14/99
Barbara J. Krumsiek                 Trustee (Principal Executive Officer)


__________**____________            Principal Accounting      1/14/99
Ronald M. Wolfsheimer               Officer


__________**____________            Trustee                   1/14/99
Richard L. Baird, Jr.


__________**____________            Trustee                   1/14/99
Frank H. Blatz, Jr., Esq.


__________**____________            Trustee                   1/14/99
Frederick T. Borts, M.D.


__________**____________            Trustee                   1/14/99
Charles E. Diehl


__________**____________            Trustee                   1/14/99
Douglas E. Feldman


__________**____________            Trustee                   1/14/99
Peter W. Gavian


__________**____________            Trustee                   1/14/99
John G. Guffey, Jr.


__________**____________            Trustee                   1/14/99
M. Charito Kruvant


__________**____________            Trustee                   1/14/99
Arthur J. Pugh


__________**____________            Trustee                   1/14/99
David R. Rochat


__________**____________            Trustee                   1/14/99
D. Wayne Silby


**By Katherine Stoner as Attorney-in-fact, pursuant to Power of Attorney Forms
on file.







Exhibit 10




January 14, 1999


Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C. 20549


         Re:      Exhibit 10, Form N-1A
                  Calvert Tax-Free Reserves
                  File numbers 2-69565 and 811-3101


Ladies and Gentlemen:


         As counsel to Calvert Group, Ltd., it is my opinion that the
securities being registered by this Post-Effective Amendment No. 46 will
be legally issued, fully paid and non-assessable when sold. My opinion
is based on an examination of documents related to Calvert Tax-Free
Reserves (the "Trust"), including its Declaration of Trust, its By-Laws,
other original or photostatic copies of Trust records, certificates of
public officials, documents, papers, statutes, and authorities as I
deemed necessary to form the basis of this opinion.

         I therefore consent to filing this opinion of counsel with the
Securities and Exchange Commission as an Exhibit to the Trust's
Post-Effective Amendment No. 46 to its Registration Statement.

                                            Sincerely,

                                            /s/

                                            Katherine Stoner
                                            Associate General Counsel






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