CALVERT TAX FREE RESERVES
497, 1996-05-15
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PROSPECTUS --
April 30, 1996

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


INVESTMENT OBJECTIVES

         Calvert  Tax-Free  Reserves Money Market  Portfolio 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 the Portfolio.

         The Money  Market  Portfolio  seeks to  maintain a  constant  net
asset  value  of $1.00  per  share.  There  can be no  assurance  that the
Portfolio  will be  successful  in  maintaining a constant net asset value
of $1.00 per share.  An  investment  in the  Portfolio is neither  insured
nor guaranteed by the U.S. Government.

         Calvert Tax-Free  Reserves  Limited-Term  Portfolio seeks to earn
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 of the Portfolio.

         The   Limited-Term    Portfolio   invests   in   investment-grade
municipal  obligations.  Fixed rate investments have remaining  maturities
of  three  years or  less;  variable  rate  investments  may  have  longer
maturities.  The  Portfolio's  net asset  value per  share  fluctuates  in
response  to  changes  in the  value of its  investments.  There can be no
assurance   that  the   Portfolio   will  be  successful  in  meeting  its
investment objective.

         Calvert Tax-Free Reserves  Long-Term  Portfolio seeks to earn 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 of the Portfolio.

         The  Long-Term  Portfolio  invests in long-term  investment-grade
municipal  obligations.  Its  average  maturity  is  normally in excess of
twenty years.  Because of its longer average  maturity,  its yield and net
asset value per share will  generally  fluctuate in response to changes in
interest rates and other market factors.

PURCHASE INFORMATION


         The Money Market  Portfolio  offers two classes of shares,  Class
O,  described in and offered by this  Prospectus,  and Class MMP (CTFR MMP
Shares),  offered by another Calvert Tax-Free Reserves  Prospectus.  Class
O and  Class  MMP are the same  except  that  Class O has no  Distribution
Plan expenses.


         The  Limited-Term   and  Long-Term   Portfolios  each  offer  two
classes of shares,  with different  expense levels and sales charges.  You
may choose to purchase  (i) Class A shares,  with a sales  charge  imposed
at the time you purchase the shares  ("front-end  sales charge");  or (ii)
Class C shares  which  impose  neither  a  front-end  sales  charge  nor a
contingent  deferred  sales  charge.  Class C  shares  are  not  available
through all dealers.  Class C shares have a higher level of expenses  than
Class A shares,  including  higher  Rule 12b-1  fees.  These  alternatives
permit  you to  choose  the  method  of  purchasing  shares  that  is most
beneficial  to you,  depending on the amount of the  purchase,  the length
of time you  expect  to hold the  shares,  and  other  circumstances.  See
"Alternative Sales Options" for further details.

TO OPEN AN ACCOUNT

         Call your broker,  or complete  and return the  enclosed  Account
Application. Minimum initial investment is $2,000.

ABOUT THIS PROSPECTUS

         Please read this Prospectus before  investing.  It is designed to
provide you with  information  you ought to know before  investing  and to
help you  decide if the goals of a  Portfolio  match  your own.  Keep this
document for future reference.


         A Statement of Additional Information (dated April 30, 1996)
for each Portfolio has been filed with the Securities and Exchange
Commission and is incorporated by reference. This free Statement is
available upon request from the Fund: 800-368-2748.

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 ON THE  ACCURACY  OR
ADEQUACY  OF THIS  PROSPECTUS.  ANY  REPRESENTATION  TO THE  CONTRARY IS A
CRIMINAL OFFENSE.

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED OR
ENDORSED  BY, ANY BANK,  AND ARE NOT  FEDERALLY  INSURED BY THE FDIC,  THE
FEDERAL  RESERVE  BOARD,  OR ANY OTHER AGENCY.  WHEN INVESTORS SELL SHARES
OF THE FUND,  THE VALUE MAY BE HIGHER OR LOWER THAN THE AMOUNT  ORIGINALLY
PAID.

<PAGE>

<TABLE>
<CAPTION>

FUND EXPENSES

                                                 Calvert Money Market Portfolio

A.  Shareholder Transaction Costs                    Class O


     <S>                                              <C>
    Sales Load on Purchases                           None
    Sales Load on Reinvested
    Dividends                                         None
    Deferred Sales Load                               None
    Redemption Fees                                   None
    Exchange Fee                                      None


B.  Annual Fund Operating Expenses -
    Fiscal Year 1995
    (as a percentage of average net assets)
    Management Fees                                   .45%
    Rule 12b-1 Fees                                   None
    All Other Expenses                                .17%
    Total Fund Operating Expenses<F2>                 .62%



<CAPTION>

                                             Calvert Limited-Term
                                             Portfolio
 A.   Shareholder Transaction Costs          Class A       Class C
  
     <S>                                     <C>           <C>

     Maximum Sales Charge on Purchases  
     (as a percentage of offering price)     2.00%         None
     Contingent Deferred Sales Charge        None          None



B.   Annual Fund Operating
     Expenses- Fiscal Year 1995
     (as a percentage of average net assets)
     Management Fees                         0.60%         0.60%
     Rule 12b-1 Service and
     Distribution Fees                       None          0.55%
     Other Expenses                          0.11%         0.20%
     Total Fund Operating Expenses<F2>       0.71%         1.35%


<CAPTION>

                                             Calvert Long-Term
                                             Portfolio
A.   Shareholder Transaction Costs           Class A       Class C

     <S>                                     <C>           <C>
 
     Maximum Sales Charge on Purchases
     (as a percentage of offering price)     3.75%         None


     Contingent Deferred Sales Charge        None          None



B.   Annual Fund Operating
     Expenses- Fiscal Year 1995
     (as a percentage of average net assets)
     Management Fees                         0.61%         0.61%
     Rule 12b-1 Service and
     Distribution Fees                       0.09%         1.00%
     Other Expenses                          0.17%%        0.58%
     Total Fund Operating Expenses<F2>       0.87% %       2.19%


<FN>
<F2> Net Fund Operating Expenses after reduction for fees paid indirectly were:
         Money Market Class O .61%          Limited-Term Class A .70%
         Long-Term Class A .85%             Limited-Term Class C 1.34%
         Long-Term Class C 2.17%
</FN>

</TABLE>


C.   Example: You would pay the following expenses on a $1,000
investment, assuming (1) 5% annual return;(2) redemption at the end of
each period; and (3) for Class A, payment of maximum initial sales
charge at time of purchase:


<TABLE>
<CAPTION>

Fund                   1 Year      3 Years      5 Years      10 Years

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

Money Market
Class O                $6           $20          $35         $77



Limited-Term
Class A                $27          $42          $59         $106
Class C                $14          $43          $74         $162

Long-Term
Class A                $46          $64          $84         $141
Class C                $22          $69          $117        $252


The  example,   which  is   hypothetical,   should  not  be  considered  a
representation  of past or future expenses.  Actual expenses may be higher
or lower than those shown.


Explanation  of  Table:  The  purpose  of the  table is to  assist  you in
understanding  the  various  costs and  expenses  that an  investor in the
Portfolios   may  bear  directly   (shareholder   transaction   costs)  or
indirectly (annual fund operating expenses).

</TABLE>


      A.   Shareholder  Transaction  Costs  are  charges  you pay when you
buy or sell shares of a  Portfolio.  If you request a wire  redemption  of
less than $1,000,  you will be charged a $5 wire fee.  See "Reduced  Sales
Charges"  at Exhibit A to see if you qualify for  possible  reductions  in
the sales charge for the Limited- or Long-Term Portfolios.


      B.   Annual  Fund   Operating   Expenses  are  based  on  historical
expenses.   Management  Fees  are  paid  by  the  Fund  to  Calvert  Asset
Management  Company,  Inc.   ("Investment   Advisor")  for  managing  each
Portfolio's   investments   and   business   affairs,   and   include   an
administrative  service  fee  paid  to  Calvert  Administrative   Services
Company,  Inc.  Each  Portfolio  incurs  Other  Expenses  for  maintaining
shareholder records,  furnishing  shareholder  statements and reports, and
other  services.  Management  Fees and Other  Expenses  have  already been
reflected in the share price for the Limited-  and  Long-Term  Portfolios,
and in the  yield  for the  Money  Market  Portfolio  and are not  charged
directly to individual shareholder accounts.

           The Rule 12b-1 fees of the  Limited- and  Long-Term  Portfolios
include an  asset-based  sales charge.  Thus,  long-term  shareholders  in
each  Portfolio  may pay more in total  sales  charges  than the  economic
equivalent  of the maximum  front-end  sales charge  permitted by rules of
the National Association of Securities Dealers, Inc.


<PAGE>

FINANCIAL HIGHLIGHTS


The following tables provide  information  about the financial  history of
the  Class O shares of the Money  Market  Portfolio  and the Class A and C
shares  of  the  Limited-  and  Long-Term  Portfolios.  They  express  the
information  in terms of a single  share  outstanding  for the  respective
Portfolio  throughout  each period.  The tables have been audited by those
independent  accountants  whose  report is  included  in Calvert  Tax-Free
Reserves  Annual  Report  to  Shareholders  for  each  of  the  respective
periods  presented.  The  tables  should be read in  conjunction  with the
financial  statements and their related  notes.  The current Annual Report
to  Shareholders  is  incorporated  by  reference  into the  Statement  of
Additional Information.


<TABLE>
<CAPTION>

Class O Shares
Money Market Portfolio                  
                                        

                                         Year Ended December 31,
                                         1995                   1994
                                        =================================
                                        =================================


<S>                                     <C>                       <C>   

Net asset value, beginning of year      $1.000                   $1.000
Income from investment operations
     Net investment income                .040                     .028
Distributions from
     Net investment income               (.040)                   (.028)

Net asset value, end of year            $1.000                   $1.000


Total return<F1>                         4.02%                    2.81%

Ratio to average net assets:
Net investment income                    3.93%                    2.75%

 Total expenses <F2>                      .62%                      --

 Net expenses                             .61%                     .62%

Net assets, end of year (in thousands)  $1,740,839               $1,344,595

Number of shares outstanding at end of
 year (in thousands)                     1,740,948                1,344,668

<FN>
<F1>Total return prior to 1989 is not audited.
<F2>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>

</TABLE>


<PAGE>

<TABLE>
<CAPTION>

Class O Shares
Money Market Portfolio                     Year Ended December 31,
                                           1993           1992
                                           ===========================
                                           ===========================

<S>                                        <C>            <C>   

Net asset value, beginning of year         $1.000         $1.000
Income from investment operations
     Net investment income                   .024           .031
Distribution
     Net investment income                  (.024)         (.031)

Net asset value, end of year                $1.000        $1.000

Total return<F1>                             2.41%         3.18%

Ratio to average net assets:
Net investment income                        2.37%         3.10%

 Total expenses <F2>                           --            --

 Net expenses                                 .60%          .59%

Net assets, end of year (in thousands)      $1,500,614    $1,552,106


Number of shares outstanding at end of
year (in thousands)                          1,500,557     1,552,061

<FN>
<F1>Total return prior to 1989 is not audited.
<F2>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>

Class 0 Shares
Money Market Portfolio                   Year Ended December 31,
                                         1991                1990
                                         ================================
                                         ================================

<S>                                      <C>                 <C>   

Net asset value, beginning of year       $1.000              $1.000
Income from investment operations
     Net investment income                 .048                .059
Distributions from
     Net investment income                (.048)              (.059)

Net asset value, end of year             $1.000              $1.000

Total return<F1>                          4.96%               6.04%

Ratio to average net assets:
Net investment income                     4.79%               5.85%

 Total expenses <F2>                        --                  --

 Net expenses                              .61%                .63%


Net assets, end of year (in thousands)   $1,382,330          $1,071,719

Number of shares outstanding at end of
year (in thousands)                       1,382,288           1,071,678


<FN>
<F1>Total return prior to 1989 is not audited.
<F2>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>

Class 0 Shares
Money Market Portfolio                Year Ended December 31,
                                      1989                  1988
                                      ===========================

<S>                                   <C>                    <C>   

Net asset value, beginning of year    $1.000                $1.000
Income from investment operations
     Net investment income              .063                  .052
Distributions from
     Net investment income             (.063)                (.052)

Net asset value, end of year          $1.000                $1.000

Total return<F1>                       6.47%                 5.31%

Ratio to average net assets:
Net investment income                  6.22%                 5.19%

 Total expenses <F2>                ------------          ------------

 Net expenses                           .62%                  .62%

Net assets, end of year
(in thousands)                      $952,347              $823,759

Number of shares outstanding
at end of year (in thousands)        952,257               823,696

<FN>
<F1>Total return prior to 1989 is not audited.
<F2>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>

Class 0 Shares
Money Market Portfolio                  Year Ended December 31,
                                        1987                  1986
                                        ===========================
                                        ===========================

<S>                                     <C>                    <C>   

Net asset value, beginning of year      $1.000                $1.000
Income from investment operations
     Net investment income                .046                  .048
Distributions from
     Net investment income               (.046)                (.048)

Net asset value, end of year            $1.000                $1.000

Total return <F1>                        4.62%                 4.77%

Ratio to average net assets:
Net investment income                    4.56%                 4.66%

 Total expenses <F2>                       --                    --

 Net expenses                             .62%                  .67%

Net Assets, end of year
(in thousands)                       $688,967               $519,491

Number of shares outstanding at end
of year (in thousands)                  688,986             519,399


<FN>
<F1>Total return prior to 1989 is not audited.
<F2>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>

Limited-Term Class A Shares
Year Ended December 31,                          1995                1994

<S>                                              <C>                 <C>   

Net asset value, beginning                       $10.59              $10.72

Income from investment operations
     Net investment income                       .45                 .39
     Net realized and unrealized gain (loss)
         on investments                          .13                (.13)
         Total from investment operations        .58                 .26

Distributions from
     Net investment income                       (.45)              (.39)

Total increase (decrease) in net asset value     .13                 (.13)

Net asset value, end of year                     $10.72              $10.59

Total return<F3>                                  5.55%               2.42%

Ratio to average net assets
     Net investment income                       4.21%               3.60%
     Total expenses<F4>                          .71%                --
     Net expenses                                .70%                .66%

Portfolio turnover                               33%                 27%


Net assets, end of year (in thousands)           $457,707        $544,822


Number of shares outstanding at
end of year (in thousands)                        42,690           51,424

<FN>
<F3> Total return is not annualized and does not reflect deduction of Class
A front-end sales charge.
<F4> Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>

</TABLE>


<PAGE>
<TABLE>
<CAPTION>

Limited-Term Portfolio Class A Shares                  Year Ended December
                                                               31,
                                                              1993
                                                      ======================

<S>                                                             <C>   

Net asset value, beginning of year                              $10.68
Income from investment operations
     Net investment income                                         .38
     Net realized and unrealized gain (loss) on
         investments                                               .04
         Total from investment operations                          .42

Distributions from
     Net investment income                                        (.38)

Total increase (decrease) in net asset value                       .04

Net asset value, end of year                                    $10.72

Total return<F3>                                                  4.02%


Ratio to average net assets:
 Net investment income                                            3.59%
 Total expenses <F4>                                               --
 Net expenses                                                      .67%

Portfolio turnover                                                 14%


Net assets, end of year                                        $663,305

Number of shares outstanding at
end of year (in thousands)                                      61,861

<FN>
<F3> Total return is not annualized and does not reflect deduction of Class
A front-end sales charge.
<F4> Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>
</TABLE>

<PAGE>
<TABLE>
<CAPTION>


Limited-Term Class A Shares                           Year Ended December 31,
                                                      1992             1991
                                                      ========================
                                                      ========================

<S>                                                   <C>               <C> 

Net asset value, beginning of year                    $10.65           $10.61
Income from investment operations
     Net investment income                               .49              .64
     Net realized and unrealized gain (loss) on
         investments                                     .03              .03
         Total from investment operations                .52              .67

Distributions from
     Net investment income                              (.49)            (.63)

Total increase (decrease) in net asset value             .03              .04

Net asset value, end of year                          $10.68           $10.65

Total return<F3>                                        4.99%            6.46%

Ratio to average net assets:
 Net investment income                                  4.58%            5.99%
 Total expenses<F4>                                       --               --
 Net expenses                                            .71%             .73%

 Portfolio turnover                                        5%               1%

Net assets, end of year                               $567,419        $294,308

Number of shares outstanding at end of year (in
     thousands)                                        53,140           27,644

<FN>
<F3> Total return is not annualized and does not reflect deduction of Class
A front-end sales charge.
<F4> Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>


Limited-Term Class A Shares                      Year Ended December 31,
                                                 1990        1989      1988
                                                 ==========================

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

Net asset value, beginning of year               $10.61     $10.55     $10.45
Income from investment operations
     Net investment income                          .67        .67        .60
     Net realized and unrealized gain (loss) on
         investments                                .00        .06        .10
         Total from investment operations           .67        .73        .70

Distributions from
     Net investment income                         (.67)     (.67)      (.60)

Total increase (decrease) in net asset value        .00       .06        .10
Net asset value, end of year                     $10.61    $10.61     $10.55

Total return<F3>                                   6.50%     7.12%      6.82%

Ratio to average net assets:
 Net investment income                            6.35%      6.35%      5.71%
 Total expenses<F4>                               6.50%      7.12%      6.50%
 Net expenses                                      .77%       .78%       .81%
Portfolio turnover                                  12%        21%        68%

Net assets, end of year (in thousands)         $151,580    132,510    145,305

Number of shares outstanding at end of
year (in  thousands)                            14,286      12,487     13,771

<FN>
<F3> Total return is not annualized and does not reflect deduction of Class
A front-end sales charge.
<F4> Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>


Limited-Term Class A Shares                    Year Ended December 31,
                                               1987                1986
                                               ===========================
                                               ===========================

<S>                                             <C>                <C>   

Net asset value, beginning of year              $10.67             $10.48
Income from investment operations
     Net investment income                         .59                .64
     Net realized and unrealized gain (loss) on
         investments                              (.22)               .23
         Total from investment operations          .37                .87

Distributions from
     Net investment income                        (.59)              (.64)

Total increase (decrease) in net asset value      (.22)               .19

Net asset value, end of year                      $10.45           $10.67

Total return<F3>                                    3.54%            8.50%

Ratio to average net assets:
 Net investment income                              5.59%            6.00%
 Total expenses<F4>                                   --               --
 Net expenses                                        .76%             .81%

Portfolio turnover                                    52%              67%


Net assets, end of year (in thousands)             $147,742          189,354

Number of shares outstanding at end of year (in
     thousands)                                     14,137           17,748


<FN>
<F3> Total return is not annualized and does not reflect deduction of Class
A front-end sales charge.
<F4> Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>

                                                              From
                                                              Inception
                                                Year Ended    (March 1, 1994)
                                                December 31,  through Dec. 31,
 Limited-Term Class C Shares                     1995         1994

<S>                                              <C>             <C>   
Net asset value, beginning                       $10.56          $10.70
Income from investment operations
     Net investment income                       .38                .27
     Net realized and unrealized gain (loss)
         on investments                          .13                (.12)
         Total from investment operations        .51                 .15

Distributions from
     Net investment income                       (.39)              (.29)

Total increase (decrease) in net asset value     .12                 (.14)

Net asset value, ending                          $10.68            $10.56

Total return<F3>                                   4.86%             1.43%

Ratio to average net assets
     Net investment income                       3.57%             3.05%(a)

     Total expenses<F4>                          1.35%               --
     Net expenses                                1.34%             1.38%(a)

Portfolio turnover                               33%                 27%

Net assets, ending (in thousands)                $30,057          $31,081

Number of shares outstanding,
ending (in thousands)                            2,814              2,942

<FN>
<F3> Total return is not annualized and does not reflect deduction of Class
A front-end sales charge.
<F4> Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>

(a) Annualized
</TABLE>


<PAGE>
<TABLE>
<CAPTION>

Long-Term Portfolio Class A Shares               Year Ended December 31,
                                                 1995              1994
                                                 ========================

<S>                                               <C>             <C>   

Net asset value, beginning of year                $15.83          $17.15
Income from investment operations
     Net investment income                           .95             .93
     Net realized and unrealized gains (loss)
         on investments                             1.53           (1.33)
         Total from investment operations           2.48            (.40)

Distributions from
     Net investment income                          (.91)           (.92)
     Net realized gains                             (.09)             --
                                                    (1.00)          (0.92)
         Total distributions
Total increase (decrease) in net asset value        (1.48)          (1.32)

Net asset value, end of year                        $17.31         $15.83

Total return<F5>                                     16.05%         (2.30)%

Ratio to average net assets:
 Net investment income                                5.71%          5.73%
 Total expenses<F6>                                    .87%            --
 Net expenses                                          .85%           .81%

Portfolio turnover                                      58%            98%

Expenses reimbursed                                      --            --

Net assets, end of year (in thousands)               $57,359        $47,267

Number of shares outstanding at end of year (in        3,314          2,985
     thousands)

<FN>
<F5>Total return is not annualized and does not reflect deduction of
Class A front-end sales charges. Total return prior to 1989 is not
audited.
<F6>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>

</TABLE>


<PAGE>
<TABLE>
<CAPTION>

Long-Term Portfolio Class A Shares                     Year Ended December
                                                               31,
                                                              1993
                                                      ======================

<S>                                                        <C>   

Net asset value, beginning of year                         $16.32
Income from investment operations
     Net investment income                                    .94
     Net realized and unrealized gain (loss) on
         investments                                          .83
         Total from investment operations                    1.77
Distributions from
     Net investment income                                   (.94)
     Net realized gains                                        --
         Total distributions                                 (.94)

Total increase (decrease) in net asset value                  .83
Net asset value, end of year                               $17.15

Total return<F5>                                            11.12%

Ratio to average net assets:
 Net investment income                                       5.59%
 Total expenses<F6>                                            --
 Net expenses                                                 .78%

Portfolio turnover                                             97%

Expenses reimbursed                                             --

Net assets, end of year ( in thousands)                     $55,204

Number of shares outstanding at end of year (in               3,219
     thousands)

<FN>
<F5>Total return is not annualized and does not reflect deduction of
Class A front-end sales charges. Total return prior to 1989 is not
audited.
<F6>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>


Long-Term Portfolio Class A Shares              Year Ended December 31,
                                                1992              1991
                                                ==========================
                                                ==========================

<S>                                               <C>             <C>   

Net asset value, beginning of year                $16.11          $15.35
Income from investment operations
     Net investment income                           .98             .97
     Net realized and unrealized gain (loss) on
         investments                                 .20             .78
         Total from investment operations           1.18            1.75

Distributions from
     Net investment income                          (.97)           (.99)
     Net realized gains                               --               --
         Total distributions                        (.97)           (.99)

Total increase (decrease) in net asset value         .21             .76

Net asset value, end of year                      $16.32          $16.11

Total return<F5>                                    7.60%          11.77%

Ratio to average net assets:
 Net investment income                              6.06%          6.39%
 Total expenses<F6>                                   --             --
 Net expenses                                        .82%           .78%

Portfolio turnover                                   196%           276%

Expenses reimbursed                                   --             --

Net assets, end of year (in thousands)            $45,665        $43,774

Number of shares outstanding at end of year (in    
     thousands)                                    2,799          2,718

<FN>
<F5>Total return is not annualized and does not reflect deduction of
Class A front-end sales charges. Total return prior to 1989 is not
audited.
<F6>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>


Long-Term Portfolio Class A Shares            Year Ended December 31,
                                              1990         1989         1988
                                              ================================

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

Net asset value, beginning of year            $15.64       $15.20     $14.75
Income from investment operations
     Net investment income                       .97         1.03       1.01
     Net realized and unrealized gain (loss) on
         investments                            (.27)         .41        .46
         Total from investment operations        .70         1.44       1.47

Distributions from
     Net investment income                      (.99)       (1.00)     (1.02)
     Net realized gains                           --           --         --
         Total distributions                    (.99)       (1.00)     (1.02)

Total increase (decrease) in net asset value    (.29)         .44        .45

Net asset value, end of year                   $15.35      $15.64     $15.20

Total return<F5>                                 4.74%       9.81%     10.27%

Ratio to average net assets:
    Net investment income                        6.60%       6.66%      6.78%
    Total expenses<F6>                            --          --          --
    Net expenses                                 .82%         .85%       .85%

Portfolio turnover                               264%        284%        553%

Expenses reimbursed                               --         --          .04%

Net assets, end of year (in thousands)         $40,182     $46,402     $43,101

Number of shares outstanding at end of
year (in  thousands)                             2,618       2,967       2,835

<FN>
<F5>Total return is not annualized and does not reflect deduction of
Class A front-end sales charges. Total return prior to 1989 is not
audited.
<F6>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>

Long-Term Portfolio Class A Shares                 Year Ended December 31,
                                                   1987                1986
                                                   ==========================
                                                   ==========================

<S>                                                <C>                 <C>   

Net asset value, beginning of year                 $16.36              $15.80
Income from investment operations
     Net investment income                           1.15                1.22
     Net realized and unrealized gain (loss) on
         investments                                (1.63)               1.45
         Total from investment operations            (.48)               2.67
Distributions from
     Net investment income                          (1.13)              (1.24)
     Net realized gains                                --                (.87)
         Total distributions                        (1.13)              (2.11)
Total increase (decrease) in net asset value        (1.61)                .56
Net asset value, end of year                        $14.75             $16.36
Total return<F5>                                     (2.96)%            17.43%
Ratio to average net assets:
 Net investment income                                7.32%              7.34%
 Total expenses<F6>                                     --                 --
 Net expenses                                          .83%               .85%

Portfolio turnover                                      77%               146%

Expenses reimbursed                                     --                 --

Net assets, end of year (in thousands)              $49,231            $81,824

Number of shares outstanding at end of year (in      
     thousands)                                      3,338              5,000

<FN>
<F5>Total return is not annualized and does not reflect deduction of
Class A front-end sales charges. Total return prior to 1989 is not
audited.
<F6>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>

                                                               From
                                                               Inception
                                              Year Ended       (March 1, 1994)
                                              December 31      through Dec.31,
Long-Term Class C Shares                      1995             1994


<S>                                           <C>              <C>   

Net asset value, beginning                    $15.72           $16.86

Income from investment operations
     Net investment income                       .78              .58
     Net realized and unrealized gain (loss)
         on investments                         1.46            (1.04)
         Total from investment operations       2.24             (.46)

Distributions from
     Net investment income                      (.74)            (.68)
     Net realized gains                         (.09)               --
         Total distributions                     .83             (.68)

Total increase (decrease) in net asset value    1.41            (1.14)

Net asset value, ending                       $17.13           $15.72

Total return<F5>                               14.51%           (2.24%)

Ratio to average net assets
     Net investment income                      4.34%            3.57%(a)
     Total expenses<F6>                         2.19%              --
     Net expenses                               2.17%            2.55%(a)
     Expenses reimbursed                         --              3.06%(a)

Portfolio turnover                                 58%             98%

Net assets, ending (in thousands)             $1,678              $871

Number of shares outstanding,
ending (in thousands)                             98                55

<FN>
<F5>Total return is not annualized and does not reflect deduction of
Class A front-end sales charges. Total return prior to 1989 is not
audited.
<F6>Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; previously such reductions
were included in the ratio.
</FN>

(a) Annualized
</TABLE>

<PAGE>

INVESTMENT OBJECTIVE AND POLICIES

Money Market Portfolio

The Money  Market  Portfolio  seeks to earn 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 of the Portfolio.

The Money Market Portfolio  invests  primarily in a diversified  portfolio
of municipal  obligations  whose  interest is exempt from  federal  income
tax.   Municipal   obligations   in  which  the   Portfolio   invests  are
short-term,  fixed and variable rate  instruments  of minimal  credit risk
and of high quality.  The Portfolio  invests in municipal  bonds and notes
and  tax-exempt  commercial  paper within the two highest  credit  ratings
categories  or,  if  unrated,  are  determined  by  the  Advisor  to be of
comparable quality.  Short-term  obligations have remaining  maturities of
one year or less.  The Portfolio  maintains an average  weighted  maturity
of 90 days or less.

Limited-Term Portfolio

The  Limited-Term  Portfolio  seeks to earn 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 of the Portfolio.

The Limited-Term  Portfolio invests  primarily in a diversified  portfolio
of municipal  obligations  with interest  exempt from federal  income tax.
Municipal  obligations  in which  the  Portfolio  invests  are  fixed  and
variable  rate  investment-grade  (medium and higher)  obligations.  Fixed
rate investments are limited to obligations  with remaining  maturities of
3 years or less; variable rate investments may have longer maturities.

Long-Term Portfolio

The  Long-Term  Portfolio  seeks to earn  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 of the Portfolio.

The Long-Term  Portfolio invests  primarily in a diversified  portfolio of
long term,  investment-grade municipal obligations,  the interest of which
is exempt from federal  income tax.  Investments  by the Portfolio are not
limited as to remaining maturities.

Municipal Obligations

Municipal  obligations in which the Limited- and Long-Term  Portfolios may
invest  include,  but are not  limited  to  general  obligation  bonds and
notes   of  state   and   local   issuers,   revenue   bonds  of   various
transportation,  housing,  utilities (e.g., water and sewer), hospital and
other   state  and  local   government   authorities,   tax  and   revenue
anticipation  notes and bond anticipation  notes,  municipal  leases,  and
certificates of  participation  therein,  and private  activity bonds. See
further description below and the Statement of Additional Information.

Credit Quality

The credit  quality of municipal  obligations  is  determined by reference
to  a  commercial  credit  rating  service,   such  as  Moody's  Investors
Service,  Inc. or Standard & Poor's  Corporation.  If an instrument is not
rated,  credit quality is determined by the Advisor under the  supervision
of the Board of Trustees.  Investment  grade,  as  determined  by a NRSRO, is
currently  defined as the top four rating  categories,  i.e.,  AAA/Aaa, AA/Aa,
A, and BBB/Baa. Though still investment  grade,  securities rated BBB/Baa 
possess certain  speculative  elements  and  are  generally  more  susceptible 
to changing  market  conditions.  There is no limitation on the percentage of
each  Portfolio's  assets  that may be  invested  in unrated  obligations;
such  obligations may be less liquid than rated  obligations of comparable
quality.  The  ratings  used  by  these  services  are  described  in  the
Appendix to the Statement of Additional Information.

Variable Rate Obligations

Each  Portfolio  may invest in variable  rate  obligations.  Variable rate
obligations  have a yield that is adjusted  periodically  based on changes
in the level of  prevailing  interest  rates.  Floating  rate  obligations
have an interest  rate fixed to a known  lending  rate,  such as the prime
rate,  and  are  automatically  adjusted  when  the  known  rate  changes.
Variable  rate  obligations  lessen  the  capital   fluctuations   usually
inherent  in  fixed  income  investments.  This  diminishes  the  risk  of
capital  depreciation  of  investment   securities  in  a  Portfolio  and,
consequently,  of Portfolio  shares.  However,  if interest rates decline,
the yield of the invested  Portfolio  will decline,  causing the Portfolio
and its  shareholders to forego the  opportunity for capital  appreciation
of the Portfolio's investments and of their shares.
<PAGE>

Demand Notes

Each  Portfolio  may invest in  floating  rate and  variable  rate  demand
notes.  Demand  notes  provide  that the holder may demand  payment of the
note at its par  value  plus  accrued  interest  by  giving  notice to the
issuer.  To ensure the  ability  of the issuer to make  payment on demand,
the note may be supported by an unconditional bank letter of credit.

Interest-Rate Risk

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

Municipal Leases - Money Market Portfolio

The  Money  Market   Portfolio  may  invest  in  structured  money  market
instruments,   where  the  underlying   security  is  a  municipal  lease.
Generally,  such  instruments  are  structured  as  tax-exempt  commercial
paper or  variable  rate demand  notes,  and are  typically  secured by an
unconditional  letter of credit.  In the unlikely event that the letter of
credit is not honored,  the lease would  present  special  risks,  such as
the chance that the  municipality  might not  appropriate  funding for the
lease  payments.  Thus, the Advisor  considers risk of cancellation in its
investment  analysis.  Certain leases may be considered  illiquid.  In all
cases,   the  Money  Market   Portfolio   invests  only  in   high-quality
instruments  (rated in one of the two  highest  rating  categories,  or if
unrated,  of comparable  credit quality) that meet the requirements of SEC
Rule 2a-7  regarding  credit  quality and  maturity.  See the Statement of
Additional Information.

Municipal Leases - Limited-Term and Long-Term Portfolios

The  Limited-Term  and  Long-Term   Portfolios  may  invest  in  municipal
leases.   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.  There are  additional  risks  inherent in  investing in
this type of municipal  security.  Unlike municipal notes and bonds, where
a  municipality  is  obligated  by  law to  make  interest  and  principal
payments when due,  funding for lease  payments  needs to be  appropriated
each fiscal year in the budget.  It is possible that a  municipality  will
not appropriate  funds for lease payments.  The Advisor  considers risk of
cancellation  in its  investment  analysis.  The  Portfolio  may  purchase
unrated municipal leases.  The Advisor,  under supervision of the Board of
Trustees,  is  responsible  for  determining  the  credit  quality of such
leases,  on an ongoing basis.  The Limited- and Long-Term  Portfolios will
invest   only  in   municipal   leases   that  meet  its  credit   quality
restrictions.  Certain  municipal  leases may be  considered  illiquid and
subject to the  Portfolios'  limit on illiquid  investments.  The Board of
Trustees has  established  guidelines for  determining  whether a lease is
illiquid.  See the  Statement of  Additional  Information  for the factors
considered by the Board in determining liquidity and valuation of leases.

When-Issued Purchases

New issues of municipal  obligations  are offered on a when-issued  basis;
that is,  delivery and payment for the  securities  normally take place 15
to 45 days after the date of the transaction.  The payment  obligation and
the yield that will be  received on the  securities  are each fixed at the
time the buyer enters into the  commitment.  The Portfolios will only make
commitments  to purchase these  securities  with the intention of actually
acquiring  them, but may sell these  securities  before the
settlement  date if it is  deemed  advisable  as a  matter  of  investment
strategy.

Temporary Investments

For  liquidity  purposes or pending the  investment of the proceeds of the
sale of its shares,  the  Portfolios 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 to you as
ordinary income unless you are otherwise exempt from taxation.

Financial Futures, Options, and Other Investment Techniques

The  Long-Term  Portfolio  can  use  various  techniques  to  increase  or
decrease its exposure to changing  security  prices,  interest  rates,  or
other factors that affect security  values.  These  techniques may involve
derivative  transactions  such as buying and  selling  options and futures
contracts  and  leveraged  notes,  entering  into  swap  agreements,   and
purchasing  indexed  securities.  The  Portfolio  can use these  practices
either as  substitution  or as  protection  against an adverse move in the
Long-Term  Portfolio to adjust the risk and return  characteristics of the
Portfolio.   If  the  Advisor  judges  market  conditions  incorrectly  or
employs a  strategy  that  does not  correlate  well with the  Portfolio's
investments,  or if the  counterparty to the transaction  does not perform
as promised,  these  techniques  could result in a loss.  These techniques
may increase the  volatility of a fund and may involve a small  investment
of cash  relative to the magnitude of the risk  assumed.  Any  instruments
determined  to be illiquid are subject to the  Long-Term  Portfolio's  10%
restriction  on  illiquid  securities.  See  below  and the  Statement  of
Additional Information for more details about these strategies.
<PAGE>

The  Long-Term  Portfolio  buys  certain  financial  futures  contracts to
hedge its investments in municipal bonds.

Under  certain  circumstances,  the  Long-Term  Portfolio may purchase and
sell certain  financial  futures  contracts and certain options on futures
contracts.  A  financial  futures  contract  obligates  the  seller  of  a
contract to deliver -- and the  purchaser  of a contract to take  delivery
of -- the type of financial  instrument  covered by the  contract.  In the
case of index-based  futures  contracts,  the obligation is in the form of
a cash settlement at a specific time for a specific price.

The Long-Term  Portfolio may only engage in futures  transactions  for the
purpose of hedging its  investments  in municipal  bonds against  declines
in value  and to hedge  against  increases  in the cost of  securities  it
intends to purchase.  A sale of financial  futures contracts may provide a
hedge  against a  decline  in the value of  portfolio  securities  because
such  depreciation  may be offset,  in whole or in part, by an increase in
the  value  of  the  position  in  the  futures  contracts.  Similarly,  a
purchase of financial  futures  contracts  may provide a hedge  against an
increase  in the cost of  securities  intended  to be  purchased,  because
such  appreciation  may be offset,  in whole or in part, by an increase in
the value of the position in the futures contracts.

Types of futures contracts purchased

The Long-Term  Portfolio  intends to deal in futures  contracts based upon
The Bond Buyer  Municipal  Bond  Index,  a  price-weighted  measure of the
market  value  of 40  large,  recently-issued  tax-exempt  bonds,  and  to
engage  in  transactions  in  exchange-listed  futures  contracts  on U.S.
Treasury   securities.   The  Long-Term   Portfolio  may  also  engage  in
transactions  in other  futures  contracts,  such as futures  contracts on
other  municipal  bond indexes that become  available,  if the  investment
advisor  believes  such  contracts  would be  appropriate  for hedging its
investments in municipal bonds.

When  the  Long-Term  Portfolio  purchases  a  futures  contract,  it will
maintain an amount of cash,  cash  equivalents  (for  example,  commercial
paper and daily tender  adjustable  notes) or short-term  high grade fixed
income  securities  in a segregated  account with its  custodian,  so that
the  segregated  amount  plus the amount of initial and  variation  margin
held in the account of its broker  equals the market  value of the futures
contract,  thereby  ensuring  that  the use of such  futures  contract  is
unleveraged.  It is not  anticipated  that  transactions  in futures  will
have the effect of increasing portfolio turnover.

Closing out a futures position - Risks

The Long-Term  Portfolio may close out its position in a futures  contract
or an option on a futures  contract  only by entering  into an  offsetting
transaction  on the  exchange on which the position  was  established  and
only if there is a liquid  secondary market for the futures  contract.  If
it is not  possible  to  close  a  futures  position  entered  into by the
Long-Term  Portfolio,  it could be required to make continuing  daily cash
payments of variation margin in the event of adverse price  movements.  In
such  situations,  if the Long-Term  Portfolio has  insufficient  cash, it
may have to sell  portfolio  securities  to meet  daily  variation  margin
requirements  at a time  when it would be  disadvantageous  to do so.  The
inability  to close  futures  or options  positions  could have an adverse
effect on the Long-Term  Portfolio's  ability to hedge effectively.  There
is also risk of loss by the  Portfolio of margin  deposits in the event of
bankruptcy  of a broker  with  whom the  Long-Term  Portfolio  has an open
position  in  a  futures  contract.  The  success  of a  hedging  strategy
depends on the  Advisor's  ability to predict  the  direction  of interest
rates and other economic  factors.  The  correlation is imperfect  between
movements  in  the  prices  of  futures  or  options  contracts,  and  the
movements of prices of the securities  which are subject to the hedge.  If
the  Long-Term  Portfolio  used a futures  or  options  contract  to hedge
against a  decline  in the  market,  and the  market  later  advances  (or
vice-versa),  the  Portfolio  may suffer a greater loss than if it had not
hedged.

Please  refer  to  the  Long-Term   Portfolio's  Statement  of  Additional
Information for further information on financial futures contracts.

Other Policies - Money Market, Limited- and Long-Term Portfolios

Each   Portfolio  may   temporarily   borrow  money  from  banks  to  meet
redemption  requests,  but such  borrowing may not exceed 10% of the value
of its total  assets.  Each  Portfolio  has  adopted  certain  fundamental
investment  restrictions  which are  discussed in detail in its  Statement
of  Additional  Information.  Unless  specifically  noted  otherwise,  the
investment  objective,  policies and  restrictions  of each  Portfolio are
fundamental and may not be changed without shareholder approval.
<PAGE>

YIELD AND TOTAL RETURN

Yield refers to income generated by an investment over a period of time
for each class

The Money Market  Portfolio may advertise  "yield" and  "effective  yield"
for each class (see  "Management  of the Fund").  Yield  figures are based
on   historical   earnings  and  are  not  intended  to  indicate   future
performance.  The  "yield"  of the Money  Market  Portfolio  refers to the
actual  income  generated  by  an  investment  in  the  Portfolio  over  a
particular base period,  stated in the  advertisement.  If the base period
is less  than one year,  the  yield  will be  "annualized."  That is,  the
amount of income  generated  by the  investment  during the base period is
assumed  to be  generated  over  a  one-year  period  and  is  shown  as a
percentage of the  investment.  The "effective  yield" is calculated  like
yield,  but assumes  reinvestment  of earned income.  The effective  yield
will be slightly higher than the yield because of the  compounding  effect
of this assumed reinvestment.

Limited- and Long-Term Portfolios

Yield measures the current  investment  performance  for each class;  that
is, the rate of income on a Portfolio's  investments  divided by the share
price.  Yield is computed by  annualizing  the result of dividing  the net
investment  income per share over a 30 day period by the maximum  offering
price  per share on the last day of that  period.  Yields  are  calculated
according to accounting  methods that are  standardized  for all stock and
bond funds.

Taxable Equivalent Yield - Money Market, Limited- and Long-Term
Portfolios

Each  Portfolio  may  advertise  its "taxable  equivalent  yield" for each
class.  The  taxable  equivalent  yield is the  yield  that  you  would be
required  to obtain  from  taxable  investments  to equal the yield of the
class,  all or a  portion  of which  may be  exempt  from  federal  income
taxes.  The taxable  equivalent yield is computed by taking the portion of
the yield  exempt from  regular  federal  income tax and  multiplying  the
exempt  yield by a factor based on a stated  income tax rate,  then adding
the portion of the yield that is not exempt from  regular  federal  income
tax. The factor that is used to  calculate  the taxable  equivalent  yield
is the  reciprocal  of the  difference  between  one  and  the  applicable
income tax rate, which will be stated in the advertisement.

The Limited- and Long-Term Portfolios may advertise total return for
each class. Total return is based on historical results and is not
intended to indicate future performance.


Total  return is  calculated  separately  for each class.  It includes not
only the  effect  of  income  dividends  but also any  change in net asset
value,  or principal  amount,  during the stated period.  The total return
for each class shows its  overall  change in value,  including  changes in
share  price  and  assuming  all  of  the   dividends   and  capital  gain
distributions  are  reinvested.  A cumulative  total  return  reflects the
performance  over a stated period of time. An average  annual total return
("return with maximum load" reflects the  hypothetical  annual  compounded
return that would have  produced the same  cumulative  total return if the
performance  had been constant  over the entire  period.  Because  average
annual  returns tend to smooth out  variations in the returns,  you should
recognize  that  they are not the  same as  actual  year-by-year  results.
Both types of total  return for Class A shares  usually  will  include the
effect of paying the  front-end  sales  charge.  Of course,  total returns
will be higher if sales  charges  are not taken into  account.  Quotations
of "return  without  maximum  load" do not reflect  deduction of the sales
charge.  You should  consider these return figures only if you qualify for
a reduced sales  charge,  or for purposes of  comparison  with  comparable
figures  which also do not  reflect  sales  charges,  such as mutual  fund
averages   compiled   by  Lipper   Analytical   Services,   Inc.   Further
information  about the Portfolio's  performance is contained in its Annual
Report to Shareholders, which may be obtained without charge.


MANAGEMENT OF THE FUND

The Board of Trustees supervises Portfolio activities and reviews its
contracts with companies that provide it with services.

The Portfolios are series of Calvert  Tax-Free  Reserves (the "Fund"),  an
open-end  management  investment  company,   organized  as  a
Massachusetts  business  trust on October 20, 1980. The series of the Fund
include the Money  Market  Portfolio,  Limited-Term  Portfolio,  Long-Term
Portfolio,  California Money Market  Portfolio,  and the Vermont Municipal
Portfolio.


The  Money  Market  Portfolio  offers  two  classes  of  shares,  Class O,
described  in and  offered  by this  Prospectus,  and  Class MMP (CTFR MMP
Shares),  offered by the Calvert Tax-Free  Reserves Money Market Class MMP
Prospectus.  The two classes represent  interests in the same portfolio of
investments   and  are  identical  in  all  respects,   except:   (a)  the
Distribution  Plan expenses are payable only by the Class MMP shares;  (b)
the classes  may have  different  transfer  agency  fees;  (c) postage and
delivery,  printing and stationery expenses will be separately  allocated;
(d) the  classes  will have  different  dividend  rates due  solely to the
effects of (a)  through  (c) above;  and (e) only the Class MMP shares may
vote on matters which pertain to the  Distribution  Plan. Class MMP Shares
are offered primarily to clients of broker-dealers.


The Fund is not  required to hold annual  shareholder  meetings for any of
the  Portfolios,  but special  meetings may be called for such purposes as
electing   Trustees,   changing   fundamental   policies,   and  approving
management  contracts.  As a  shareholder,  you  receive one vote for each
share of a Portfolio  you own,  except that matters  affecting  Portfolios
or  classes  differently,  such as  Distribution  Plans,  will be voted on
separately by the affected Portfolio(s) or class(es).
<PAGE>

Portfolio Managers


Investment  selections for the Limited- and Long-Term  Portfolios are made
by David R.  Rochat and Reno J.  Martini.  Mr.  Rochat is a  Director  and
Senior Vice President of Calvert Asset  Management  Company,  Inc. He is a
Trustee/Director  and Senior Vice  President of First  Variable Rate Fund,
Calvert  Tax-Free  Reserves,  Money Management Plus, The Calvert Fund, and
Calvert  Municipal  Fund,  Inc., and is primarily  responsible for setting
the  investment  strategy of the  trading  department,  utilizing  over 20
years' experience in the securities and investment  community.  Mr. Rochat
joined  Calvert  Group  in  1981  after   establishing  and  managing  the
municipal  bond  department at Donaldson,  Lufkin,  & Jenrette  Securities
Corporation.  Mr. Martini,  a Director of Calvert Group,  Ltd., and Senior
Vice President and Chief  Investment  Officer of Calvert Asset  Management
Company,  Inc.,  oversees  management of all Calvert Group portfolios.  He
has  extensive   experience  in  evaluating   and   purchasing   municipal
securities.


Calvert Group is one of the largest investment management firms in
Washington, D.C. area.


Calvert Group,  Ltd.,  parent of the Fund's investment  advisor,  transfer
agent,  and  distributor,  is a subsidiary of Acacia Mutual Life Insurance
Company  of  Washington,   D.C.  Calvert  Group  is  one  of  the  largest
investment  management firms in the Washington,  D.C. area. Calvert Group,
Ltd. and its  subsidiaries  are located at 4550 Montgomery  Avenue,  Suite
1000N,  Bethesda,  Maryland 20814. As of December 31, 1995,  Calvert Group
managed and  administered  assets in excess of $4.8  billion and more than
200,000 shareholder and depositor accounts.


Calvert Asset Management serves as Advisor to the Fund.


Calvert  Asset  Management  Company,  Inc.  (the  "Advisor") is the Fund's
investment  advisor.   The  Advisor  provides  the  Fund  with  investment
supervision  and  management,  administrative  services and office  space;
furnishes  executive  and  other  personnel  to the  Fund;  and  pays  the
salaries  and  fees of all  Trustees  who are  affiliated  persons  of the
Advisor.  The  Advisor may also  assume and pay  certain  advertising  and
promotional  expenses  of the Fund and  reserves  the right to  compensate
broker-dealers   in  return  for  their   promotional  or   administrative
services.  For its  services  during  fiscal  year 1995,  the  Advisor was
entitled to receive,  pursuant to the Investment Advisory  Agreement,  and
did  receive,  a fee  equal  to  0.45%  of the  Money  Market  Portfolio's
average  net assets,  0.59% of the  Limited-Term  Portfolio's  average net
assets, and 0.60% of the Long-Term Portfolio's average net assets.


Calvert Administrative Services Company provides administrative services
for the Fund.

Calvert  Administrative  Services  Company  ("CASC"),  an affiliate of the
Advisor,  has been  retained  by  Calvert  Tax-Free  Reserves  to  provide
certain  administrative  services necessary to the conduct of its affairs,
including the preparation of regulatory  filings and shareholder  reports,
the daily  determination  of its net asset value per share and  dividends,
and the maintenance of its portfolio and general accounting  records.  For
providing such services,  CASC receives a total fee from Calvert  Tax-Free
Reserves of $200,000 per year,  allocated  among the  Portfolios  based on
assets.

Calvert Distributors, Inc. serves as underwriter to market the Fund's
shares.

Calvert  Distributors,  Inc. ("CDI") is the Fund's  principal  underwriter
and distributor.  Under the terms of its  underwriting  agreement with the
Fund,  CDI markets and  distributes  the Fund's shares and is  responsible
for  preparation of  advertising  and sales  literature,  and printing and
mailing of prospectuses to prospective investors.

The transfer agent keeps your account records.

Calvert  Shareholder  Services,  Inc.  is the  Fund's  transfer,  dividend
disbursing and shareholder servicing agent.
<PAGE>

SHAREHOLDER GUIDE

Opening An Account

You can buy shares of the Portfolios in several ways which are described
here and in the chart on page __.

An account  application  accompanies  this  prospectus.  A  completed  and
signed  application is required for each new account you open,  regardless
of the method you choose for making your  initial  investment.  Additional
forms  may  be  required  from  corporations,  associations,  and  certain
fiduciaries.  If you have any questions or need extra  applications,  call
your broker,  or Calvert Group at  800-368-2748.  Be sure to specify which
class you wish to purchase.

Limited-Term and Long-Term Portfolios
Alternative Sales Options

The  Limited-Term  and  Long-Term  Portfolios  each  offer two  classes of
shares:

Class A Shares - Front End Load Option

Class A shares  are sold  with a  front-end  sales  charge  at the time of
purchase.  Class A shares are not subject to a sales  charge when they are
redeemed.

Class C shares - Level Load Option

Class C shares  are sold  without a sales  charge at the time of  purchase
or redemption.

Class C shares have higher expenses

Each  Portfolio  bears  some of the  costs of  selling  its  shares  under
Distribution  Plans  adopted with  respect to its Class C shares  pursuant
to Rule 12b-1 under the 1940 Act. The Class C  Distribution  Plan provides
for the  payment of an annual  distribution  fee to CDI of up to 0.30% for
the  Limited-Term  Portfolio and up to 0.75% for the Long-Term  Portfolio,
plus a  service  fee of up to  0.25%,  for a total  of  0.55%  and  1.00%,
respectively, of the average daily net assets.

Considerations for deciding which class of shares to buy

Income  distributions  for Class A shares  will  probably  be higher  than
those  for  Class C  shares,  as a  result  of the  distribution  expenses
described  above.  (See also "Yield and Total Return.") The Class A Shares
of the  Limited-Term  Portfolio have not adopted a Distribution  Plan. You
should  consider  Class A shares if you qualify for a reduced sales charge
under  Class A or if you plan to hold the shares for  several  years.  The
Portfolios  will not  normally  accept any  purchase  of Class C shares in
the amount of $1,000,000 or more.

Class A Shares - Limited-Term Portfolio

Class A shares are  offered  at net asset  value  plus a  front-end  sales
charge as follows:

<TABLE>
<CAPTION>

Amount of                                                     Allowed to
Investment                 As a % of        As a % of         Dealers as of
                           offering         net amount        a % of offering
                            price           invested          price

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

Less than $50,000          2.00%            2.04%             1.50%
$50,000 but less
than $100,000              1.50%            1.52%             1.1125%
$100,000 but less
than $250,000              1.1125%          1.14%             0.90%
$250,000 but less
than $500,000              1.00%            1.01%             0.80%
$500,000 but less
than $1,000,000            0.80%            0.81%             0.70%
$1,000,000 and over        0.00%            0.00%             0.25%*

Class A Shares - Long-Term Portfolio

Class A shares are offered at net asset value plus a front-end sales
charge as follows:
</TABLE>

<PAGE>
<TABLE>
<CAPTION>

Amount of                  As a % of        As a % of         Allowed to
Investment                 offering         net amount        Dealers as a %
                           price            invested          of offering price

<S>                        <C>              <C>               <C>   
Less than $50,000          3.75%            3.90%             3.00%
$50,000 but less
than $100,000              3.00%            3.09%             2.25%
$100,000 but less
than $250,000              2.25%            2.30%             1.75%
$250,000 but less
than $500,000              1.75%            1.78%             1.25%
$500,000 but less
than $1,000,000            1.00%            1.01%             0.80%
$1,000,000 and over        0.00%            0.00%             0.25%*

   
**For new  investments  (new purchases but not exchanges) of $1 million or
more a  broker-dealer  will have the choice of being  paid a finder's  fee
by CDI in one of the following  methods:  (1) CDI may pay  broker-dealers,
on a  monthly  basis  for  12  months,  an  annual  rate  of up to  0.30%.
Payments   will   be   made   less   redemptions;   or  (2)  CDI  may  pay
broker-dealers  0.25%  of  the  amount  of  the  purchase;   however,  CDI
reserves  the  right to  recoup  any  portion  of the  amount  paid to the
dealer if the  investor  redeems  some or all of the shares from the Funds
within  thirteen  months  of the  time  of  purchase.  For either choice, 
quarterly  trailing compensation will begin in the thirteenth month.
    
</TABLE>

Sales  charges on Class A shares may be reduced or  eliminated  in certain
cases. See Exhibit A to this prospectus.

The  sales  charge  is paid to CDI,  which  in turn  normally  reallows  a
portion to your  broker-dealer.  Upon written  notice to dealers with whom
it has  dealer  agreements,  CDI may  reallow  up to the  full  applicable
sales  charge.  Dealers to whom 90% or more of the entire  sales charge is
reallowed may be deemed to be  underwriters  under the  Securities  Act of
1933.

In  addition  to any sales  charge  reallowance,  your  broker-dealer,  or
other  financial   service  firm  through  which  your  account  is  held,
currently  will be paid  periodic  service fees at an annual rate of up to
0.15% for the  Limited-Term  Portfolio  and, for the Long-Term  Portfolio,
up to 0.25% of the  average  daily net asset  value of Class A shares held
in accounts maintained by that firm.

Class A Distribution Plan


The Long-Term  Portfolio has adopted a  Distribution  Plan with respect to
its Class A shares (the "Class A Distribution  Plan"),  which provides for
payments,  which are  currently  limited to 0.25%  annually of the average
daily net asset value of Class A shares,  to pay expenses  associated with
the  distribution  and  servicing  of Class A shares.  Amounts paid by the
Fund  to CDI  under  the  Class A  Distribution  Plan  are  used to pay to
dealers and  others,  including  CDI  salespersons  who service  accounts,
service  fees at an annual  rate of up to 0.25% of the  average  daily net
asset  value  of  Class A  shares,  and to pay CDI for its  marketing  and
distribution  expenses,  including,  but not  limited to,  preparation  of
advertising  and  sales   literature  and  the  printing  and  mailing  of
prospectuses  to prospective  investors.  During the 1995 fiscal year, the
Long-Term  Portfolio paid Class A  Distribution  Plan expenses of 0.17% of
average net assets.


Class C Shares - Limited-Term and Long-Term Portfolios

Class C shares are not available  through all dealers.  Class C shares are
offered  at net  asset  value,  without  a  front-end  sales  charge  or a
contingent  deferred sales charge.  Class C expenses are higher than those
of Class A.

Class C Distribution Plan


The  Limited-Term  and Long-Term  Portfolios  have adopted a  Distribution
Plan with  respect  to their  Class C shares  (the  "Class C  Distribution
Plan"),  which  provides for payments at an annual rate of up to 0.55% for
the  Limited-Term  Portfolio,  and,  for the  Long-Term  Portfolio,  up to
1.00% of the  average  daily  net asset  value of Class C  shares,  to pay
expenses of the  distribution  and  servicing  of Class C shares.  Amounts
paid by the Fund under the Class C  Distribution  Plan are currently  used
by CDI to pay  dealers  and  other  selling  firms  dealer-paid  quarterly
compensation  at an  annual  rate  of up to  0.55%  for  the  Limited-Term
Portfolio,  and,  for the  Long-Term  Portfolio,  up to  1.00%,  which may
include a service  fee as  described  above  under  "Class A  Distribution
Plan" of up to 0.25% of the average  daily net asset value of the accounts
maintained  by  that  firm.   For  the  1995  fiscal  year,  the  Class  C
Distribution  Plan expenses for the Limited-Term and Long-Term  Portfolios
were 0.55% and 1.00% of average net assets, respectively.


Arrangements with Broker-Dealers and Others (all classes)

CDI may also pay additional  concessions,  including non-cash  promotional
incentives,   such  as   merchandise  or  trips,   to  dealers   employing
registered  representatives  who  have  sold  or are  expected  to  sell a
minimum  dollar  amount of shares of the Fund and/or shares of other Funds
underwritten  by CDI.  CDI may make  expense  reimbursements  for  special
training  of  a  dealer's  registered   representatives,   advertising  or
equipment,  or  to  defray  the  expenses  of  sales  contests.   Eligible
marketing  and  distribution  expenses may be paid  pursuant to the Fund's
Rule 12b-1 Distribution Plan.

Dealers or others may receive  different levels of compensation  depending
on which class of shares they sell.  Payments  pursuant to a  Distribution
Plan are included in the operating expenses of the class.

Each of the Distribution Plans may be terminated at any time by a vote
of the Independent Trustees or by vote of a majority of the outstanding
voting shares of the respective class.

<PAGE>

                            HOW TO BUY SHARES
              BE SURE TO SPECIFY WHICH CLASS YOU ARE BUYING

Method            New Accounts                  Additional Investments


By Mail          $2,000 minimum                 $250 minimum
                 Please make your check         Please make your check          
                 payable to the appropriate     payable to the appropriate      
                 Portfolio and mail it with     Portfolio and mail it with
                 your application to:           your Investment slip to:       
                                                 
                                                                  
                                                                              
                  Calvert Group                  Calvert Group                
                  P.O. Box 419544                P.O. Box 419739            
                  Kansas City, MO                Kansas City, MO          
                  64141-6544                     64141-6739              
                                     
                                                              
By Registered, certified, or Overnight Mail:
                                    
                                   

                  Calvert Group                 Calvert Group         
                  c/o NFDS, 6th Floor           c/o NFDS, 6th Floor
                  1004 Baltimore                1004 Baltimore     
                  Kansas City, MO               Kansas City, MO 
                  64105-1807                    64105-1807         

                                   

Through Your 
  Broker          $2,000 minimum               $250 minimum



At the Calvert    Visit the Calvert Branch Office to
                  make investments by check.
Branch Office     See back cover page for the address.

FOR ALL OPTIONS BELOW, PLEASE CALL YOUR BROKER, OR CALVERT GROUP AT
800-368-2745

By Exchange       $2,000 minimum               $250 minimum

(From your account in another Calvert Group Fund)

When opening an account by exchange, your new account must be
established with the same name(s), address and taxpayer identification
number as your existing Calvert account.


By Bank Wire      $2,000 minimum               $250 minimum


By Calvert Money  Not Available for            $50 minimum


Controller*       Initial Investment

*Please allow sufficient time for Calvert Group to process your initial
request for this service, normally 10 business days. The maximum
transaction amount is $300,000, and your purchase request must be
received by 4:00 p.m. Eastern time.
<PAGE>

NET ASSET VALUE

Net asset value per share  ("NAV")  refers to the worth of one share.  NAV
is  calculated at the close of each business  day,  which  coincides  with
the  closing  of the  regular  session  of the  New  York  Stock  Exchange
(normally 4:00 p.m.  Eastern  time).  The Portfolios are open for business
each day the New York Stock  Exchange is open.  All purchases of Portfolio
shares  will be  confirmed  and  credited  to  your  account  in full  and
fractional  shares  (rounded to the nearest 1/100 of a share for the Money
Market  Portfolio  and to 1/1000 of a share for the Limited- and Long-Term
Portfolios).  The Money Market  Portfolio  may send monthly  statements in
lieu of immediate confirmations of purchases and redemptions.

The Money Market Portfolio shares are sold without a sales charge.

Money Market  Portfolio:  NAV is computed by adding the value of the Money
Market  Portfolio's  investments  plus  cash and other  assets,  deducting
liabilities  and  then  dividing  the  result  by  the  number  of  shares
outstanding.  The  Portfolio's  securities  are  valued  according  to the
"amortized  cost" method,  which is intended to stabilize the NAV at $1.00
per share.

Limited-Term  and  Long-Term  Portfolios:  NAV is  computed  by adding the
value  of  all   portfolio   holdings,   plus  other   assets,   deducting
liabilities  and  then  dividing  the  result  by  the  number  of  shares
outstanding.  Portfolio  securities  and other  assets are valued based on
market  quotations,  except that  securities  maturing  within 60 days are
valued at amortized  cost. If  quotations  are not  available,  securities
are  valued by a method  that the Board of  Trustees  believes  accurately
reflects fair value.

WHEN YOUR ACCOUNT WILL BE CREDITED

Before you buy shares, please read the following information to make
sure your investment is accepted and credited properly.


All of your  purchases  must be made in U.S.  dollars  and checks  must be
drawn on U.S.  banks.  No cash will be  accepted.  The Fund  reserves  the
right to  suspend  the  offering  of  shares  for a  period  of time or to
reject any specific  purchase  order.  If your check does not clear,  your
purchase  will be  canceled  and you will be  charged a $10 fee plus costs
incurred by the  Portfolio.  When you  purchase  by check or with  Calvert
Money  Controller,  those funds will be on hold for up to 10 business days
from  the  date  of  receipt.   During  that   period,   the  proceeds  of
redemptions  against those funds will be held until the transfer  agent is
reasonably  satisfied  that  the  purchase  payment  has  been  collected.
Drafts  written on the Money Market  Portfolio  against such funds will be
returned for uncollected  funds. To avoid this collection  period, you can
wire federal funds from your bank, which may charge you a fee.


Money Market Portfolio


Your  purchase will be processed at the net asset value  calculated  after
your order is received and accepted.  The  Portfolio  attempts to maintain
a  constant  net  asset  value of $1.00 per  share.  Except in the case of
telephone  orders,  investors  whose payments are received in or converted
into  federal  funds by 12:30  p.m.  Eastern  time by the  custodian  will
receive  the  dividend  declared  that  day.  If  your  wire  purchase  is
received  after 12:30 p.m.  Eastern time,  your account will begin earning
dividends on the next  business  day. A telephone  order placed to Calvert
Institutional  Marketing  Services by 12:30 p.m.  Eastern time will become
effective at the price  determined  at 5 p.m.  Eastern time and the shares
purchased  will receive the  dividend  declared on Fund shares that day if
federal  funds are  received  by the  custodian  by 5 p.m.  Eastern  time.
Exchanges  begin  earning  dividends  the  next  business  day  after  the
exchange  request is received by mail or by telephone.  If the purchase is
by check and is received by 4 p.m.  Eastern  time,  it will begin  earning
dividends the next business day.  Check  purchases  received at the branch
location  will be  credited  the next  business  day.  Any check  purchase
received without an investment slip may cause delayed crediting.



Limited-Term and Long-Term Portfolios


Your purchase  will be processed at the next  offering  price based on the
next net  asset  value  calculated  for each  class  after  your  order is
received and  accepted.  If your  purchase is made by wire or exchange and
is received by 4:00 p.m. Eastern  time, your  account will be credited
on the day of  receipt.  If your  purchase  is  received  after  4:00 p.m.
Eastern time, it will be credited the next business day.  Check  purchases
received at the branch  location  will be credited the next  business day.
Any check purchase  received  without an investment slip may cause delayed
crediting.

Certain financial  institutions or  broker-dealers  that have entered into
a sales  agreement  with the  Distributor  may  enter  confirmed  purchase
orders on behalf of  customers by phone,  with payment to follow  within a
number of days of the order as  specified  by the  program.  If payment is
not received in the time  specified,  the financial  institution  could be
held liable for resulting fees or losses.



EXCHANGES

You may exchange shares of Portfolio for shares of the same class of
other Calvert Group Funds.

If your investment  goals change,  the Calvert Group Family of Funds has a
variety of  investment  alternatives  that  includes  common  stock funds,
tax-exempt  and  corporate  bond  funds,   and  money  market  funds.  The
exchange  privilege  is a  convenient  way to buy shares in other  Calvert
Group  Funds in order to  respond  to  changes  in your goals or in market
conditions.  Before you make an exchange from a Fund or Portfolio,  please
note the following:


Each exchange represents the sale of shares of one Fund and the purchase
of shares of another. Thus, you could realize a taxable gain or loss.


o        Call  your  broker or a Calvert  representative  for  information
and a  prospectus  for any of  Calvert's  other Funds  registered  in your
state.  Read the  prospectus of the Fund or Portfolio  into which you want
to exchange for relevant information, including class offerings.


o        Complete and sign an  application  for an account in that Fund or
Portfolio,  taking care to register  your new account in the same name and
taxpayer  identification  number  as  your  existing  Calvert  account(s).
Exchange  instructions  may  then  be  given  by  telephone  if  telephone
redemptions  have been  authorized  and the shares are not in  certificate
form.

o        Shares on which you have  already  paid a sales charge at Calvert
Group and shares acquired by  reinvestment of dividends and  distributions
may be exchanged into another Fund at no additional charge.

o        Limited-Term  and Long-Term  Portfolios:  To protect  performance
and to minimize costs,  Calvert Group discourages  frequent  exchanges and
may prohibit  additional  purchases of Portfolio shares by persons engaged
in too many short-term  trades.  Shareholders (and those managing multiple
accounts) who make two purchases  and two exchange  redemptions  of shares
of the same Fund or  Portfolio  during any  6-month  period  will be given
written  notice  that  they  may  be  prohibited  from  making  additional
investments.  These policies do not prohibit you from redeeming  shares of
the Funds and do not apply to trades solely among money market funds.



For  purposes of the exchange  privilege,  effective  July 31,  1996,  the
Fund is related to Summit Cash Reserves  Fund by  investment  and investor
services.  Each  Portfolio reserves  the  right to  terminate  or  modify  the
exchange privilege in the future with 60 days' written notice.


<PAGE>

OTHER CALVERT GROUP SERVICES


Calvert Information Network

24 hour yield and prices

Calvert Group has a  round-the-clock  telephone service that lets existing
customers use a push button phone to obtain  prices,  yields,  performance
information, account balances, and authorize certain transactions.

Calvert Money Controller

Calvert Money Controller eliminates the delay of mailing a check or the
expense of wiring funds. You can request this free service on your
application.


This  service  allows you to  authorize  electronic  transfers  of money to
purchase  or  sell  shares.  You  use  Calvert  Money  Controller  like  an
"electronic  check"  to move  money  ($50 to  $300,000)  between  your bank
account and your  Calvert  Group  account  with one phone  call.  Allow two
business  days after the call for the  transfer  to take  place;  for money
recently  invested,  allow  normal check  clearing  time (up to 10 business
days) before redemption proceeds are sent to your bank.


You  may  also  arrange  systematic   monthly  or  quarterly   investments
(minimum  $50) into your Calvert Group  account.  After you give us proper
authorization,  your bank  account  will be debited to purchase  Portfolio
shares.  A debit  entry will appear on your bank  statement.  If you would
like  to  make   arrangements   for   systematic   monthly  or   quarterly
redemptions from your Calvert  account,  call your broker or Calvert for a
Money Controller Application.

Telephone Transactions

Calvert may record all telephone calls.

You may purchase,  redeem, or exchange shares,  wire funds and use Calvert
Money  Controller  by  telephone  if  you  have   pre-authorized   service
instructions.  You  automatically  have  telephone  privileges  unless you
elect  otherwise.  The Fund, the transfer  agent and their  affiliates are
not liable for acting in good  faith on  telephone  instructions  relating
to  your  account,  so  long  as  they  follow  reasonable  procedures  to
determine that the telephone  instructions  are genuine.  Such  procedures
may include  recording  the  telephone  calls and  requiring  some form of
personal  identification.  You should  verify the  accuracy  of  telephone
transactions immediately upon receipt of your confirmation statement.

Optional Services


Complete the account application for the easiest way to establish
services.


The easiest way to  establish  optional  services  on your  Calvert  Group
account  is to select  the  options  you  desire  when you  complete  your
account  application.  If you wish to add  other  options  later,  you may
have  to  provide  us  with   additional   information   and  a  signature
guarantee.  Please  call your  broker or  Calvert  Investor  Relations  at
800-368-2745 for further  assistance.  For our mutual  protection,  we may
require a signature guarantee on certain written transaction  requests.  A
signature  guarantee verifies the authenticity of your signature,  and may
be obtained  from any bank,  savings and loan  association,  credit union,
trust  company,   broker-dealer   firm  or  member  of  a  domestic  stock
exchange. A signature guarantee cannot be provided by a notary public.


Householding


Householding reduces Fund expenses and saves paper and trees for the
environment.


If you have  multiple  accounts  with  Calvert,  you may receive  combined
mailings of some shareholder  information,  such as semi-annual and annual
reports.  Please contact  Calvert  Investor  Relations at  800-368-2745 to
receive additional copies of information.


Special Services and Charges


The Portfolios pay for shareholder  services but not for special  services that
are  required by a few  shareholders,  such as a request for a  historical
transcript  of an account.  You may be required to pay a research  fee for
these special services.

If you are  purchasing  shares of a Portfolio  through a  program  of  services
offered by a securities dealer or financial  institution,  you should read
the  program  materials  in  conjunction  with  this  Prospectus.  Certain
features may be modified in these  programs,  and  administrative  charges
may be imposed  by the  broker-dealer  or  financial  institution  for the
services rendered.


SELLING YOUR SHARES


You may redeem all or a portion of your shares on any business  day.  Your
shares  will be  redeemed  at the next net asset  value  calculated  after
your redemption  request is received and accepted.  See below for specific
requirements   necessary   to  make  sure  your   redemption   request  is
acceptable.  Remember  that your Portfolio may hold  payment on the  redemption
of your shares until it is reasonably  satisfied that  investments made by
check or by Calvert Money  Controller have been collected  (normally up to
10 business days).


Redemption Requirements to Remember

To ensure acceptance of your redemption request, please follow the
procedures described here and below.


Once your shares are  redeemed,  the proceeds will normally be sent to you
on  the  next  business  day,  but  if  making  immediate   payment  could
adversely  affect a Portfolio,  it may take up to seven (7) days.  Calvert
Money  Controller  redemptions  generally  will be  credited  to your bank
account on the second  business  day after your phone  call.  When the New
York Stock  Exchange  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.


Minimum account balance is $1,000.

Please  maintain  a  balance  in  your  account  of at  least  $1,000  per
Portfolio,  per class.  If, due to  redemptions,  the account  falls below
$1,000,  or you  fail to  invest  at least  $1,000,  your  account  may be
closed and the proceeds  mailed to you at the address of record.  You will
be given  notice  that your  account  will be closed  after 30 days unless
you make an  additional  investment  to increase  your account  balance to
the $1,000 minimum.
<PAGE>

HOW TO SELL YOUR SHARES

Draftwriting
(Money Market Portfolio only)


You may redeem  shares in your Money Market  Portfolio  account by writing
a draft for at least $250. If you complete and return the  signature  card
for  Draftwriting,  the  Portfolio  will mail bank drafts to you,  printed
with your name and address.  Generally,  there is no charge to you for the
maintenance  of this  service or the  clearance  of  drafts,  but the Fund
reserves  the  right to  charge a  service  fee for  drafts  returned  for
uncollected or insufficient  funds.  The Fund will charge $25 for any stop
payments  on  drafts.  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  Portfolio  account from any other
of your identically  registered  accounts in Calvert money market funds or
Calvert Insured Plus. The Fund may charge a fee for this service.


By Mail To:

Calvert Group
P.O. Box 419544
Kansas City, MO
64141-6544

You may redeem  available  shares from your account at any time by sending
a letter of  instruction,  including  your name,  account and Fund number,
the  number of shares  or dollar  amount,  and where you want the money to
be sent.  Additional  requirements,  below, may apply to your account. The
letter of instruction must be signed by all required  authorized  signers.
If you want the  money  to be wired to a bank not  previously  authorized,
then a voided  bank check must be  enclosed  with your  letter.  If you do
not have a voided  check or if you would like  funds  sent to a  different
address or another person, your letter must be signature guaranteed.

Type of                    Requirements
Registration

Corporations               Letter of instruction and a corporate
Associations               resolution, signed by person(s) authorized
                           to act on the account,accompanied by
                           signature guarantee(s).


Trusts                     Letter of instruction signed by the Trustee(s)
                           (as Trustee), with a signature guarantee.
                           (If the Trustee's name is not registered on
                           your account, provide a copy of the trust
                           document, certified within the last 60 days.)

By Telephone

Please  call  800-368-2745.  You may redeem  shares  from your  account by
telephone  and have your money  mailed to your  address of record or wired
to an address or bank you have  previously  authorized.  A charge of $5 is
imposed  on  wire   transfers   of  less  than  $1,000.   See   "Telephone
Transactions" on page __.

Calvert Money Controller

Please  allow  sufficient  time for Calvert  Group to process your initial
request  for  this  service  (normally  10  business  days).  You may also
authorize   automatic   fixed   amount   redemptions   by  Calvert   Money
Controller.  All  requests  must be  received by 4:00 p.m.  Eastern  time.
Accounts cannot be closed by this service.

Exchange to Another Calvert Group Fund

You must meet the  minimum  investment  requirement  of the other  Calvert
Group Fund or  Portfolio.  You can only  exchange  between  accounts  with
identical  names,  addresses and taxpayer  identification  number,  unless
previously authorized with a signature-guaranteed letter.

Systematic Check Redemptions

If you  maintain  an account  with a balance  of $10,000 or more,  you may
have up to two (2)  redemption  checks for a fixed  amount  sent to you on
the 15th of each month,  simply by sending a letter with all  information,
including your account number,  and the dollar amount ($100  minimum).  If
you would like a regular  check  mailed to another  person or place,  your
letter must be signature guaranteed.

Through your Broker

If your  account  is  held in your  broker's  name  ("street  name"),  you
should  contact  your  broker  directly  to  transfer,  exchange or redeem
shares.
<PAGE>

DIVIDENDS AND TAXES

Each year, the Portfolio distributes substantially all of its net
investment income to shareholders.

Dividends  from the Money Market  Portfolio's  net  investment  income are
declared  daily  and paid  monthly.  Net  investment  income  consists  of
interest  income,  net  short-term  capital  gains,  if any, and dividends
declared and paid on investments, less expenses.

Dividends from the Limited- and Long-Term Portfolios' net investment
income are paid monthly.

Net  investment  income  consists  of  interest  income,   net  short-term
capital  gains,  if any, and dividends  declared and paid on  investments,
less expenses.  Each year, the Portfolios distribute  substantially all of
their net investment  income to  shareholders.  Dividend and  distribution
payments will vary between classes;  dividend  payments are anticipated to
generally be higher for Class A shares.

Dividend payment options


Dividends and any distributions  are automatically  reinvested in the same
Portfolio at net asset value (no sales  charge),  unless you elect to have
the  dividends  of $10 or more paid in cash (by check or by Calvert  Money
Controller).  Dividends and  distributions  may be automatically  invested
in an identically  registered  account with the same account number in any
other  Calvert  Group Fund or Portfolio at net asset value.  If reinvested
in the same  Fund  account,  new  shares  will be  purchased  at net asset
value on the  reinvestment  date,  which is generally 1 to 3 days prior to
the  payment  date.  You  must  be a  shareholder  on the  record  date to
receive  dividends.  You  must  notify  the Fund in  writing  prior to the
record  date  to  change  your  payment  options.  If you  elect  to  have
dividends and/or  distributions  paid in cash, and the U.S. Postal Service
cannot deliver the check,  or if it remains  uncashed for six months,  it,
as well as future  dividends  and  distributions,  will be  reinvested  in
additional shares.


"Buying a Dividend"

At the time of  purchase,  the share price of the  Limited-  or  Long-Term
Portfolios may reflect undistributed  income,  capital gains or unrealized
appreciation  of  securities.  Any capital  gains from these amounts which
are later  distributed to you are fully taxable.  On the record date for a
distribution,  a  Portfolio's  share value is reduced by the amount of the
distribution.  If you buy shares just  before the record  date  ("buying a
dividend")  you will pay the full price for the shares and then  receive a
portion of the price back as a taxable distribution.

Federal Taxes

Dividends  derived  from  interest  on  municipal  obligations  constitute
exempt-interest  dividends,  on  which  you are  not  subject  to  federal
income tax.  However,  dividends  which are from taxable  interest and any
distributions  of  short-term  capital gain are taxable to you as ordinary
income.  If the Portfolio  makes any  distributions  of long-term  capital
gains,  then  these  are  taxable  to  you  as  long-term  capital  gains,
regardless  of how long you held your shares of the  Portfolio.  Dividends
attributable  to  interest  on  certain  private  activity  bonds  must be
included  in  federal  alternative  minimum  tax for  individuals  and for
corporations.

If any taxable income or gains are paid, in January, the Portfolio will
mail you Form 1099-DIV indicating the federal tax status of dividends
paid to you by the Portfolio during the past year.

You may realize a capital gain or loss when you redeem (sell) or
exchange shares of the Limited-Term or Long-Term Portfolios.

If you sell or exchange your  Limited-Term or Long-Term  Portfolio  shares
you will have a short or  long-term  capital  gain or loss,  depending  on
how long you owned the shares which were sold.  In January,  the Fund will
mail you Form 1099-B  indicating  the proceeds  from all sales,  including
exchanges.  You should keep your annual  year-end  account  statements  to
determine the cost (basis) of the shares to report on your tax returns.

Other Tax Information

You may be subject to state or local taxes on your  investment,  depending
on the  laws in your  area.  A letter  will be  mailed  to you in  January
detailing  the  percentage  invested in your state the  previous tax year.
Such dividends may be exempt from certain state income taxes.

Taxpayer Identification Number

Federal law  requires  that you provide your  correct  Social  Security or
Taxpayer  Identification  Number ("TIN") on a signed certified application
or Form W-9. If not provided,  the  Portfolios may be required to withhold
31% of any  dividends  or  redemptions,  and you may be subject to a fine.
You will also be prohibited from opening  another account by exchange.  If
this TIN  information  is not  received  within 60 days after your account
is  established,  your  account  may be redeemed at the current NAV on the
date of  redemption.  The  Portfolios  reserve the right to reject any new
account or any purchase order for failure to supply a certified TIN.

<PAGE>


            EXHIBIT A - LIMITED-TERM AND LONG-TERM PORTFOLIOS
==========================================================================

You may qualify for a reduced sales charge through several purchase
plans available. You must notify the Fund at the time of purchase to
take advantage of the reduced sales charge.

Right of Accumulation
The  sales  charge  is  calculated  by taking  into  account  not only the
dollar  amount of a new  purchase  of shares,  but also the higher of cost
or current  value of shares  previously  purchased in Calvert  Group Funds
that impose  sales  charges.  This  automatically  applies to your account
for each new purchase.

Letter of Intent
If you plan to  purchase  $50,000 or more of Fund  shares over the next 13
months,  your sales  charge may be reduced  through a "Letter of  Intent."
You pay the lower sales  charge  applicable  to the total  amount you plan
to invest  over the  13-month  period,  excluding  any money  market  fund
purchases.  Part of your shares will be held in escrow,  so that if you do
not  invest the amount  indicated,  you will have to pay the sales  charge
applicable   to  the   smaller   investment   actually   made.   For  more
information, see the Statement of Additional Information.

Group Purchases
If you are a member of a qualified  group,  you may purchase shares of the
Fund at the  reduced  sales  charge  applicable  to the  group  taken as a
whole.  The sales  charge is  calculated  by taking into  account not only
the  dollar  amount of the  shares  you  purchase,  but also the higher of
cost or current value of shares  previously  purchased and currently  held
by other members of your group.

A "qualified  group" is one which (i) has been in existence  for more than
six  months,  (ii) has a purpose  other than  acquiring  Fund  shares at a
discount,  and (iii)  satisfies  uniform  criteria  which  enable  CDI and
dealers   offering   Fund  shares  to  realize   economies   of  scale  in
distributing  such  shares.  A  qualified  group  must  have  more than 10
members,   must  be  available  to  arrange  for  group  meetings  between
representatives  of CDI or dealers  distributing  the Fund's shares,  must
agree to  include  sales and other  materials  related  to the Fund in its
publications  and  mailings  to  members  at  reduced or no cost to CDI or
dealers,  and must seek to arrange  for  payroll  deduction  or other bulk
transmission  of  investments  to the  Fund.  Members  of a group  are not
eligible for a Letter of Intent.

Other Circumstances
There is no sales  charge on shares of any fund  (portfolio  or series) of
the Calvert Group of Funds sold to:
(1)  current  and retired  members of the Board of  Trustees/Directors  of
the  Calvert  Group of Funds,  (and the  Advisory  Council of the  Calvert
Social  Investment  Fund);  (2)  directors,  officers and employees of the
Advisor,  Distributor,  and their  affiliated  companies;  (3)  directors,
officers  and  registered  representatives  of  brokers  distributing  the
Fund's  shares;  and immediate  family  members of persons  listed in (1),
(2),  or  (3)  above;  (4)  dealers,  brokers,  or  registered  investment
advisors   that  have  entered  into  an  agreement   with  CDI  providing
specifically  for the use of shares of the Fund  (Portfolio  or Series) in
particular   investment  programs  or  products  (where  such  program  or
product  already has a fee charged  therein) made available to the clients
of such  dealer,  broker,  or  registered  investment  advisor;  (5) trust
departments  of banks or savings  institutions  for trust  clients of such
bank or savings  institution;  and (6) purchases  placed  through a broker
maintaining  an omnibus  account with the Fund  (Portfolio  or Series) and
the purchases are made by (a)  investment  advisors or financial  planners
placing  trades for their own accounts (or the accounts of their  clients)
and  who  charge  a  management,   consulting,  or  other  fee  for  their
services;  or  (b)  clients  of  such  investment  advisors  or  financial
planners  who place  trades for their own  accounts if such  accounts  are
linked to the master  account  of such  investment  advisor  or  financial
planner  on  the  books  and  records  of  the  broker  or  agent;  or (c)
retirement  and deferred  compensation  plans and trusts,  including,  but
not limited to, those  defined in Section 401(a) or Section 403(b) of the 
I.R.C.,  and "rabbi trusts."

Established Accounts
Shares of the  Long-Term  Portfolio  may be sold at net asset value to you
if your  account was  established  on or before  September  15,  1987,  or
April 30, 1988 for the Limited-Term Portfolio.


Dividends and Capital Gain Distributions from other Calvert Group Funds
You may prearrange to have your  dividends and capital gain  distributions
from  another  Calvert  Group  Fund  with  a  sales  charge  automatically
invested in another  account with no additional  sales  charge.  Except for 
money market funds, if you make a purchase at NAV,  you may  exchange  
that amount to another fund at no additional sales charge.


Reinstatement Privilege
If you redeem  Fund  shares and then  within 30 days decide to reinvest in
the same Fund,  you may do so at the net asset value next  computed  after
the reinvestment  order is received,  without a sales charge.  You may use
the  reinstatement  privilege  only once.  The Fund  reserves the right to
modify or eliminate this privilege.


<PAGE>

TABLE OF         Fund Expenses               Alternative Sales Options
CONTENTS         Financial Highlights        When Your Account Will Be Credited
                 Investment   Objectives     Exchanges
                 and Policies
                 Yield and Total Return      Other Calvert Group Services
                 Management of the Fund      Selling Your Shares
                 SHAREHOLDER GUIDE:          How to Sell Your Shares
                 How to Buy Shares           Dividends, Capital Gains and Taxes
                 Net Asset Value             Exhibit A - Reduced Sales Charges


                                                                        
                                                                         


To Open an Account:
     800-368-2748                                    Prospectus
                                                     April 30, 1996


                                                     CALVERT TAX-FREE RESERVES
                                                     MONEY MARKET PORTFOLIO
                                                     LIMITED-TERM PORTFOLIO
                                                     LONG-TERM PORTFOLIO

Performance and Prices:
Calvert Information Network
24 hours, 7 days a week
     800-368-2745

Service for Existing Accounts:
     Shareholders        800-368-2745
     Brokers             800-368-2746

TDD for Hearing Impaired:
     800-541-1524


Branch Office:
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

Registered, Certified
or Overnight Mail:
Calvert Group
c/o NFDS, 6th Floor
1004 Baltimore
Kansas City, MO 64105


Calvert Group Web-Site
Address: http://www.calvertgroup.com


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

<PAGE>
 
                       CALVERT TAX-FREE RESERVES
                       VERMONT MUNICIPAL PORTFOLIO
             4550 Montgomery Avenue, Bethesda, Maryland 20814
==========================================================================



INVESTMENT OBJECTIVE


Calvert Tax-Free  Reserves Vermont  Municipal  Portfolio (the "Portfolio")
seeks to earn the highest  level of interest  income  exempt from  federal
and Vermont  state income taxes as is consistent  with prudent  investment
management,  preservation of capital,  and its stated quality and maturity
characteristics.

Calvert Tax-Free Reserves (the "Fund") is an open-end  investment  company
that  consists  of  several   portfolios,   each  of  which  has  distinct
investment  objectives and programs.  The Vermont  Municipal  Portfolio is
nondiversified,  and invests in  investment  grade  municipal  obligations
with durations  generally  averaging  between four and nine years,  though
the  Portfolio's   holdings  may  at  any  time  have  longer  or  shorter
durations.  There can be, of course,  no assurance that the Portfolio will
be successful in meeting its investment objective.


PURCHASE INFORMATION

The Portfolio  offers two classes of shares,  each with different  expense
levels and sales  charges.  You may choose to purchase (i) Class A shares,
with  a  sales  charge  imposed  at  the  time  you  purchase  the  shares
("front-end  sales  charge");  or (ii) Class C shares which impose neither
a front-end sales charge nor a contingent  deferred sales charge.  Class C
shares  are not  available  through  all  dealers.  Class C shares  have a
higher level of expenses than Class A shares,  including  Rule 12b-1 fees.
These  alternatives  permit you to choose the method of purchasing  shares
that is most  beneficial to you,  depending on the amount of the purchase,
the   length  of  time  you   expect  to  hold  the   shares,   and  other
circumstances. See "Alternative Sales Options" for further details.


TO OPEN AN ACCOUNT

Call  your  broker,   or  complete   and  return  the   enclosed   Account
Application. Minimum initial investment is $2,000.


ABOUT THIS PROSPECTUS

Please read this Prospectus  before  investing.  It is designed to provide
you with  information  you ought to know before  investing and to help you
decide if the  Portfolio's  goals match your own.  Keep this  document for
future reference.


A Statement  of  Additional  Information  (dated  April 30,  1996) for the
Portfolio has been filed with the Securities  and Exchange  Commission and
is  incorporated  by  reference.  This free  Statement is  available  upon
request from the Fund: 800-368-2748.


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 ON THE  ACCURACY  OR
ADEQUACY  OF THIS  PROSPECTUS.  ANY  REPRESENTATION  TO THE  CONTRARY IS A
CRIMINAL OFFENSE.

SHARES OF THE FUND ARE NOT DEPOSITS OR  OBLIGATIONS  OF, OR  GUARANTEED OR
ENDORSED  BY, ANY BANK,  AND ARE NOT  FEDERALLY  INSURED BY THE FDIC,  THE
FEDERAL  RESERVE  BOARD,  OR ANY OTHER AGENCY.  WHEN INVESTORS SELL SHARES
OF THE FUND,  THE VALUE MAY BE HIGHER OR LOWER THAN THE AMOUNT  ORIGINALLY
PAID.

<PAGE>

<TABLE>
<CAPTION>

FUND EXPENSES

A. Shareholder Transaction Costs            Class A         Class C
==========================================================================

<S>                                         <C>             <C>  

Maximum Sales Charge on
Purchases (as a percentage of               3.75%           None
offering price)

Contingent Deferred Sales Charge            None            None


B. Annual Fund Operating Expenses -
Fiscal year 1995 (as a percentage of average net assets)


Management Fees                             0.61%           0.61%
Rule 12b-1 Service and Distribution Fees    0.00%           1.00%
Other Expenses                              0.15%           0.86%
Total Fund Operating Expenses<F1>           0.76%           2.47%

<FN>
<F1>Net Fund Operating Expenses after reduction for fees paid indirectly
for Class A and Class C were 0.75% and 2.46%, respectively.
</FN>
</TABLE>

C. Example: You would pay the following expenses on a $1,000 investment,
assuming (1) 5% annual return;(2) redemption at the end of each period;
and (3) for Class A, payment of maximum initial sales charge at time of
purchase:

<TABLE>
<CAPTION>


Fund              1 Year        3 Years      5 Years          10 Years
==========================================================================

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

Class A           $45           $61           $78             $128 
                                 

Class C           $25           $77           $132            $281

</TABLE>

The example, which is hypothetical, should not be considered a representation
of past or future expenses.  Actual expenses and return may be higher or
lower than those shown.


Explanation  of  Table:  The  purpose  of the  table is to  assist  you in
understanding  the  various  costs and  expenses  that an  investor in the
Portfolio   may  bear   directly   (shareholder   transaction   costs)  or
indirectly (annual fund operating expenses).

A.       Shareholder  Transaction  Costs are  charges you pay when you buy
or sell shares of the  Portfolio.  See "Reduced  Sales Charges" at Exhibit
A to see if you qualify for possible  reductions in the sales  charge.  If
you request a wire  redemption of less than $1,000,  you will be charged a
$5 wire fee.


B.       Annual  Fund  Operating  Expenses  are  based on the  Portfolio's
historical  expenses.  Management  Fees are  paid by the  Fund to  Calvert
Asset Management  Company,  Inc.  ("Investment  Advisor") for managing the
Portfolio's   investments   and   business   affairs,   and   include   an
administrative  service  fee  paid  to  Calvert  Administrative   Services
Company,   Inc.  The  Portfolio  incurs  Other  Expenses  for  maintaining
shareholder records,  furnishing  shareholder  statements and reports, and
other  services.  Management  Fees and Other  Expenses  have  already been
reflected in the Portfolio's  share price and are not charged  directly to
individual shareholder accounts.


         The  Portfolio's  Rule 12b-1 fees  include an  asset-based  sales
charge.   Thus,  it  is  possible  that  long-term   shareholders  in  the
Portfolio   may  pay  more  in  total  sales  charges  than  the  economic
equivalent  of the maximum  front-end  sales charge  permitted by rules of
the National Association of Securities Dealers, Inc.

<PAGE>


FINANCIAL HIGHLIGHTS


The following table provides  information  about the financial  history of
the  Portfolio's  Class A and C shares.  It expresses the information in
terms of a single share  outstanding  for the  Portfolio  throughout  each
period.  The  table  has been  audited  by those  independent  accountants
whose report is included in the Calvert  Tax-Free  Reserves  Annual Report
to  Shareholders   of  the  Fund  for  each  of  the  respective   periods
presented.  The table  should be read in  conjunction  with the  financial
statements  and  their  related  notes.   The  current  Annual  Report  is
incorporated by reference into the Statement of Additional Information.



<TABLE>
<CAPTION>


Class A Shares
Year Ended December 31,                          1995                1994

<S>                                              <C>                 <C>   

Net asset value, beginning                       $15.34              $16.66


Income from investment operations
     Net investment income                       .87                 .87
     Net realized and unrealized gain (loss)
     on investments                              1.35                (1.35)

     Total from investment operations            2.22                (.48)

Distributions from
     Net investment income                       (.85)               (.84)
     Net realized gains                          (.09)               --
         Total distributions                     (.94)               (.84)

Total increase (decrease) in net asset value     1.28                (1.32)

Net asset value, ending                         $16.62              $15.34

Total return<F2>                                 14.86%              (2.88%)
     
Ratio to average net assets
     Net investment income                       5.35%               5.47%
     Total expenses<F3>                          .76%                --
     Net expenses                                .75%                .73%

Expenses reimbursed                              --                  --

Portfolio turnover                               12%                 11%

Net assets, ending (in thousands)             $60,203             $64,215

Number of shares outstanding
ending (in thousands)                          3,621               4,185

<FN>
<F2>
<F3>Total return does not reflect deduction of Class A front-end sales
charge.
</FN>
</TABLE>



<PAGE>

<TABLE>
<CAPTION>

Class A Shares
Year Ended December 31,                          1993                1992

<S>                                               <C>                <C>  

Net asset value, beginning                       $15.83              $15.58

 
Income from investment operations
     Net investment income                       .86                 .84
     Net realized and unrealized gain (loss)
     on investments                              .82                 .31
     Total from investment operations            1.68                1.15

Distributions from
     Net investment income                       (.85)               (.84)
     Net realized gains                          --                  (.06)
         Total distributions                     (.85)               (.90)

Total increase (decrease) in net asset value     .83                 .25

Net asset value, end of year                     $16.66              $15.83


Total return<F3>                                10.84%              4.99%

Ratio to average net assets
     Net investment income                       5.25%               5.41%
     Total expenses<F4>                          --                  --
     Net expenses                                .72%                .62%

Expenses reimbursed                              --                  --

Portfolio turnover                               5%                  11%

Net assets, end of year (in thousands)           $67,634             $53,179

Number of shares outstanding at
end of year (in thousands)                       4,060               3,359

<FN>
<F3>Total return does not reflect deduction of Class A front-end sales
charge.
<F4>Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>

                                                 From Inception
                                                 (April 1, 1991)
                                                 through Dec. 31,
Class A Shares                                   1991

<S>                                              <C>    

Net asset value, beginning                       $15.00
Income from investment operations
     Net investment income                       .68
     Net realized and unrealized gain (loss)
     on investments                              .58
     Total from investment operations            1.26

Distributions from
     Net investment income                       (.66)
     Net realized gains                          (.02)
     Total distributions                         (.68)

Total increase (decrease) in net asset value     .58

Net asset value, ending                          $15.58

Total return<F5>                                  11.43%(a)

Ratio to average net assets
     Net investment income                       5.97%(a)
     Total expenses<F6>                           --
     Net expenses                                .28%(a)

Expenses reimbursed                              .06%(a)

Portfolio turnover                               8%

Net assets, ending (in thousands)                $38,828

Number of shares outstanding,
ending (in thousands)                            2,492

<FN>
<F5>Total return does not reflect deduction of Class A front-end sales
charge.
<F6>Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>
(a) Annualized
</TABLE>


<PAGE>
                                                                
<TABLE>
<CAPTION>
                                                               From Inception
Class C Shares                               Year Ended        (March 1, 1994)
                                             December 31,      through Dec. 31,
                                              1995              1994

<S>                                           <C>                <C>   
                                                                                
Net asset value, beginning                    $15.26            $16.40


Income from investment operations
     Net investment income                       .58                .51
     Net realized and unrealized gain (loss)
     on investments                              1.35             (1.06)

     Total from investment operations            1.93             (.55)

Distributions from
     Net investment income                       (.68)             (.59)
     Net realized gains                          (.09)               --
         Total distributions                     (.77)             (.59)

Total increase (decrease) in net asset value     1.16              (1.14)

Net asset value, end of year                     $16.42           $15.26

Total return<F7>                                  12.88%            (2.94%)
     
Ratio to average net assets
     Net investment income                       3.61%            3.87%(a)

     Total expenses<F8>                          2.47%               --
     Net expenses                                2.46%            2.41%(a)


Expenses reimbursed                              --               1.85%(a)

Portfolio turnover                               12%              11%

Net assets, end of year (in thousands)           $394             $223

Number of shares outstanding at
end of year (in thousands)                       24               15

<FN>
<F7>Total return does not reflect deduction of Class A front-end sales
charge.
<F8>Effective December 31, 1995, this ratio reflects total expenses before
reduction for fees paid indirectly; such reductions are included in the
ratio of net expenses.
</FN>

(a) Annualized
</TABLE>

<PAGE>

INVESTMENT OBJECTIVE AND POLICIES

Investment Objective

The Portfolio  seeks to earn the highest  level of interest  income exempt
from  Vermont and  federal  income  taxes as is  consistent  with  prudent
investment   management,   preservation   of  capital,   and  the  quality
characteristics  of the  Portfolio.  The  Portfolio  invests  primarily in
tax-exempt   investment-grade   municipal  obligations  of  the  State  of
Vermont   and   its    political    subdivisions    ("Vermont    Municipal
Obligations").  The  Portfolio  has  no  duration  restrictions,  but  the
average  portfolio  duration  is  expected  to be  between  four  and nine
years, although it may vary significantly.

Under  normal  market  conditions,  the  Portfolio  attempts  to invest at
least 65% of the value of its  assets in  Vermont  Municipal  Obligations.
The  Portfolio  will also attempt to invest the remaining 35% of its total
assets in these  obligations,  but may invest it in municipal  obligations
of other states,  territories,  and possessions of the United States,  the
District  of  Columbia,  and  their  respective   authorities,   agencies,
instrumentalities,  and  political  subdivisions.  Dividends  you  receive
from  the   Portfolio   that  are  derived  from  interest  on  tax-exempt
obligations  of other  governmental  issuers  will be exempt from  federal
tax, but may be subject to Vermont state income taxes.


Nondiversified

There may be risks associated with the Portfolio being nondiversified.
Specifically, since a relatively high percentage of the assets of the
Portfolio may be invested in the obligations of a limited number of
issuers, the value of the shares of the Portfolio may be more
susceptible to any single economic, political or regulatory event than
the shares of a diversified fund.

Municipal Obligations

Municipal  obligations in which the Portfolio may invest include,  but are
not  limited  to  general  obligation  bonds  and notes of state and local
issuers,  revenue  bonds of  various  transportation,  housing,  utilities
(e.g.,  water and sewer),  hospital  and other state and local  government
authorities,  tax and  revenue  anticipation  notes and bond  anticipation
notes,  municipal leases, and certificates of participation  therein,  and
private  activity bonds. See further  description  below and the Statement
of Additional Information.

Credit Quality

The credit  quality of municipal  obligations  is  determined by reference
to  a  commercial  credit  rating  service,   such  as  Moody's  Investors
Service,  Inc.  or  Standard  &  Poor's  Corporation.  In the  case of any
instrument  that  is  not  rated,  credit  quality  is  determined  by the
Advisor  under  the  supervision  of the  Board  of  Trustees.  Investment
grade,  as  determined  by a  NRSRO,  currently  defined  as the top  four
rating  categories,  i.e.,  AAA, AA, A and BBB.  Though  still  investment
grade,  securities rated BBB/Baa possess certain speculative  elements and
are generally more  susceptible to changing  market  conditions.  There is
no limitation  on the  percentage  of the  Portfolio's  assets that may be
invested  in unrated  obligations.  Such  obligations  may be less  liquid
than  rated  obligations  of  comparable  quality.  Please  refer  to  the
Appendix in the Statement of Additional  Information  for a description of
the ratings used by these services.

Variable Rate Obligations

The  Portfolio  may invest in variable  rate  obligations.  Variable  rate
obligations  have a yield that is adjusted  periodically  based on changes
in the level of  prevailing  interest  rates.  Floating  rate  obligations
have an interest  rate fixed to a known  lending  rate,  such as the prime
rate,  and  are  automatically  adjusted  when  the  known  rate  changes.
Variable  rate  obligations  lessen  the  capital   fluctuations   usually
inherent  in  fixed  income  investments,  which  diminishes  the  risk of
capital  depreciation  of  investment  securities  in  the  Portfolio  and
Portfolio  shares.  However,  should interest rates decline,  the yield of
the Portfolio  will decline and the Portfolio  and its  shareholders  will
forego  the  opportunity   for  capital   appreciation  of  its  portfolio
investments and of their shares.

<PAGE>

Demand Notes

The  Portfolio  may  invest in  floating  rate and  variable  rate  demand
notes.  Demand  notes  provide  that the holder may demand  payment of the
note at its par  value  plus  accrued  interest  by  giving  notice to the
issuer.  To ensure the  ability  of the issuer to make  payment on demand,
the note may be supported by an unconditional bank letter of credit.

Interest-Rate Risk

All fixed income  instruments are subject to interest-rate  risk; that is,
if the market  interest rates rise, the current  principal value of a bond
will  decline.  In  general,  the longer  the  maturity  of the bond,  the
greater the decline in value.  Because the  Portfolio's  average  duration
is between 4 and 9 years,  it would be expected  to be more  affected by a
rise in market  interest  rates than a short-term  money market fund,  but
less  adversely  affected by a rise in market  interest  rates than a fund
which invests in longer-term bonds.

Municipal Leases

The  Portfolio  may invest in municipal  leases.  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.  There are
additional   risks  inherent  in  investing  in  this  type  of  municipal
security.  Unlike  municipal  notes and  bonds,  where a  municipality  is
obligated  by law to  make  interest  and  principal  payments  when  due,
funding for lease  payments needs to be  appropriated  each fiscal year in
the  budget.  It is  possible  that a  municipality  will not  appropriate
funds for lease  payments.  The Advisor  considers risk of cancellation in
its  investment  analysis.  The Portfolio may purchase  unrated  municipal
leases.   The  Fund's   Advisor,   under   supervision  of  the  Board  of
Trustees/Directors,  is responsible  for determining the credit quality of
such leases on an ongoing  basis.  The Fund will invest only in  municipal
leases  that  meet its  credit  quality  restrictions.  Certain  municipal
leases may be  considered  illiquid  and  subject  to the Fund's  limit on
illiquid  investments.  The Board of  Trustees/Directors  has  established
guidelines  for  determining   whether  a  lease  is  illiquid.   See  the
Statement of  Additional  Information  for the factors  considered  by the
Board in determining liquidity and valuation of leases.

When-Issued Purchases

New issues of municipal  obligations  are offered on a when-issued  basis;
that is,  delivery and payment for the  securities  normally take place 15
to 45 days after the date of the transaction.  The payment  obligation and
the yield that will be  received on the  securities  are each fixed at the
time the buyer enters into the  commitment.  The Portfolio  will only make
commitments  to purchase  such  securities  with the intention of actually
acquiring the  securities,  but the  Portfolio  may sell these  securities
before  the  settlement  date if it is  deemed  advisable  as a matter  of
investment strategy.

Temporary Investments

From time to time for  liquidity  purposes  or pending the  investment  of
the proceeds of the sale of Portfolio  shares,  the  Portfolio  may invest
in  and  derive  up  to  20%  of  its  income  from   taxable   short-term
obligations of the U.S.  Government,  its agencies and  instrumentalities.
Interest  earned  from  such  taxable   investments  will  be  taxable  as
ordinary income unless you are otherwise exempt from taxation.

To minimize  taxable  income,  the  Portfolio  may also hold cash which is
not earning  income.  It is a  fundamental  policy of the  Portfolio  that
during normal market  conditions the  Portfolio's  assets will be invested
so that at least 80% of the  Portfolio's  annual  income will be federally
tax-exempt.

<PAGE>

Considerations for Investing in Vermont

Since the  Portfolio  attempts to invest at least 65 percent of its assets
in Vermont  Municipal  Obligations,  the  performance of the Portfolio may
be affected by local economic  conditions,  more than other funds.  If the
local economy in Vermont  suffers a downturn,  the Portfolio is limited in
its  alternative  investment  choices.  As with any  state,  you should be
aware that  certain  proposed  state or local  constitutional  amendments,
legislative  measures,  executive  orders,  administrative  regulations or
voter  initiatives,  in  addition  to  local  economic  conditions,  could
result in adverse  consequences  affecting the ability of the State or its
municipalities  to meet their  obligations in a timely manner,  which,  in
turn, could affect the Portfolio's performance.

See the  Statement of Additional  Information  for more detail on economic
conditions  in Vermont,  which may help you assess the risks of  investing
in Vermont.

Financial Futures, Options, and Other Investment Techniques

The  Portfolio  can use various  techniques  to  increase or decrease  its
exposure to changing  security  prices,  interest  rates, or other factors
that affect  security  values.  These  techniques  may involve  derivative
transactions  such as buying and selling  options  and  futures  contracts
and  leveraged  notes,  entering  into  swap  agreements,  and  purchasing
indexed  securities.  The  Portfolio  can use  these  practices  either as
substitution  or as  protection  against an adverse move in the  Portfolio
to adjust the risk and return  characteristics  of the  Portfolio.  If the
Advisor  judges market  conditions  incorrectly or employs a strategy that
does not  correlate  well  with  the  Portfolio's  investments,  or if the
counterparty  to the  transaction  does not  perform  as  promised,  these
techniques  could  result in a loss.  These  techniques  may  increase the
volatility  of a fund and may involve a small  investment of cash relative
to the magnitude of the risk  assumed.  Any  instruments  determined to be
illiquid  are  subject to the  Portfolio's  10%  restriction  on  illiquid
securities.  See below and the  Statement of  Additional  Information  for
more details about these strategies.

The Portfolio  may buy certain  financial  futures  contracts to hedge its
investments in municipal bonds.

Under certain  circumstances,  the Portfolio may purchase and sell certain
financial  futures contracts and certain options on futures  contracts.  A
financial  futures contract  obligates the seller of a contract to deliver
- -- and the  purchaser  of a contract  to take  delivery  of -- the type of
financial  instrument covered by the contract.  In the case of index-based
futures  contracts,  the obligation is in the form of a cash settlement at
a specific time for a specific price.

The Portfolio may only engage in futures  transactions  for the purpose of
hedging its investments in municipal  bonds against  declines in value and
to  hedge  against  increases  in the  cost of  securities  the  Portfolio
intends to purchase.  A sale of financial  futures contracts may provide a
hedge  against a  decline  in the value of  portfolio  securities  because
such  depreciation  may be offset,  in whole or in part, by an increase in
the  value  of  the  position  in  the  futures  contracts.  Similarly,  a
purchase of financial  futures  contracts  may provide a hedge  against an
increase  in the cost of  securities  intended  to be  purchased,  because
such  appreciation  may be offset,  in whole or in part, by an increase in
the value of the position in the futures contracts.

Types of futures contracts purchased.

The  Portfolio  intends to deal in futures  contracts  based upon The Bond
Buyer Municipal Bond Index, a  price-weighted  measure of the market value
of  40  large,   recently-issued   tax-exempt  bonds,  and  to  engage  in
transactions  in  exchange-listed   futures  contracts  on  U.S.  Treasury
securities.  The  Portfolio  may  also  engage  in  transactions  in other
futures  contracts,  such as futures  contracts  on other  municipal  bond
indexes that become  available,  if the investment  advisor  believes such
contracts  would be appropriate  for hedging the  Portfolio's  investments
in municipal bonds.

When the  Portfolio  purchases  a futures  contract,  it will  maintain an
amount  of cash,  cash  equivalents  (for  example,  commercial  paper and
daily  tender  adjustable  notes) or  short-term  high grade fixed  income
securities  in a segregated  account with the  Portfolio's  custodian,  so
that the  segregated  amount  plus the  amount of  initial  and  variation
margin  held in the account of its broker  equals the market  value of the
futures  contract,  thereby ensuring that the use of such futures contract
is unleveraged.  It is not anticipated  that  transactions in futures will
have the effect of increasing portfolio turnover.

<PAGE>

Closing out a futures position -- Risks

The  Portfolio  may close out its  position  in a futures  contract  or an
option  on  a  futures  contract  only  by  entering  into  an  offsetting
transaction  on the  exchange on which the position  was  established  and
only if there is a liquid  secondary market for the futures  contract.  If
it is not  possible  to  close  a  futures  position  entered  into by the
Portfolio,  the Portfolio could be required to make continuing  daily cash
payments of variation margin in the event of adverse price  movements.  In
such situations,  if the Portfolio has  insufficient  cash, it may have to
sell portfolio  securities to meet daily variation margin  requirements at
a time when it would be  disadvantageous  to do so. The inability to close
futures  or  options  positions  could  have  an  adverse  effect  on  the
Portfolio's  ability to hedge  effectively.  There is also risk of loss by
the  Portfolio of margin  deposits in the event of  bankruptcy of a broker
with whom the Portfolio has an open  position in a futures  contract.  The
success  of a  hedging  strategy  depends  on  the  Advisor's  ability  to
predict the direction of interest  rates and other economic  factors.  The
correlation  is  imperfect  between  movements in the prices of futures or
options  contracts,  and the movements of prices of the  securities  which
are  subject  to the  hedge.  If the  Portfolio  used a futures or options
contract to hedge  against a decline in the market,  and the market  later
advances (or  vice-versa),  the  Portfolio  may suffer a greater loss than
if it had not hedged.

Other Policies

The Portfolio may  temporarily  borrow money from banks to meet redemption
requests,  but  such  borrowing  may not  exceed  10% of the  value of the
Portfolio's  total assets.  The Portfolio has adopted certain  fundamental
investment  restrictions  which are  discussed in detail in the  Statement
of Additional Information.

YIELD AND TOTAL RETURN

Yield refers to income generated by an investment over a period of time
for each class.

Yield measures the current  investment  performance  for each class;  that
is,  the rate of  income on the  Portfolio's  investments  divided  by the
share price.  Yield is computed by annualizing  the result of dividing the
net  investment  income  per share  over a 30 day  period  by the  maximum
offering  price  per  share  on the last day of that  period.  Yields  are
calculated  according to accounting  methods that are standardized for all
stock and bond funds.

Taxable Equivalent Yield

The  Portfolio  may  advertise  its  "taxable  equivalent  yield" for each
class.  The  taxable  equivalent  yield is the  yield  that  you  would be
required  to obtain  from  taxable  investments  to equal the yield of the
class,  all or a  portion  of which  may be  exempt  from  federal  income
taxes.  The taxable  equivalent yield is computed by taking the portion of
the yield  exempt from  regular  federal  income tax and  multiplying  the
exempt  yield by a factor based on a stated  income tax rate,  then adding
the portion of the yield that is not exempt from  regular  federal  income
tax. The factor that is used to  calculate  the taxable  equivalent  yield
is the  reciprocal  of the  difference  between  one  and  the  applicable
income tax rate, which will be stated in the advertisement.

The Portfolio may advertise its total return for each class. Total
return is based on historical results and is not intended to indicate
future performance.

Total  return is  calculated  separately  for each class.  It includes not
only the  effect  of  income  dividends  but also any  change in net asset
value,  or principal  amount,  during the stated period.  The total return
for each class shows its  overall  change in value,  including  changes in
share  price  and  assuming  all  of  the   dividends   and  capital  gain
distributions  are  reinvested.  A cumulative  total  return  reflects the
performance  over a stated period of time. An average  annual total return
reflects  the  hypothetical  annual  compounded  return  that  would  have
produced  the same  cumulative  total return if the  performance  had been
constant over the entire  period.  Because  average annual returns tend to
smooth out variations in the returns,  you should  recognize that they are
not the same as actual  year-by-year  results.  Both types of total return
for  Class A  shares  usually  will  include  the  effect  of  paying  the
front-end sales charge.  Of course,  total returns will be higher if sales
charges are not taken into  account.  Quotations  of  "return wihout maximum 
load" do not reflect  deduction of the sales charge.  You should  consider  
return without maximum load figures  only if you qualify for a reduced  sales
charge,  or for purposes of comparison with  comparable  figures which also 
do not reflect sales   charges,   such  as  mutual  fund  averages   compiled  
by  Lipper Analytical  Services,  Inc.  Further  information  about  the  
Portfolio's performance is contained in its Annual Report to  Shareholders,  
which may be obtained without charge.

<PAGE>

MANAGEMENT OF THE FUND

The Board of Trustees supervises the Portfolio's activities and reviews
its contracts with companies that provide it with services.


The Portfolio is a series of Calvert  Tax-Free  Reserves (the "Fund"),  an
open-end  management  investment  company,   organized  as  a
Massachusetts  business  trust on October 20,  1980.  The other  series of
the Fund  include  the Money  Market  Portfolio,  Limited-Term  Portfolio,
Long-Term Portfolio, and the California Money Market Portfolio.


The Fund is not  required  to hold  annual  shareholder  meetings  for the
Portfolio,  but  special  meetings  may be  called  for such  purposes  as
electing   Trustees,   changing   fundamental   policies,   and  approving
management  contracts.  As a  shareholder,  you  receive one vote for each
share of the  Portfolio  you own,  except that matters  affecting  classes
differently,  such as Distribution  Plans,  will be voted on separately by
the affected class(es).

Portfolio Managers


Investment  selections  for the  Portfolio are made by David R. Rochat and
Reno J.  Martini.  Mr.  Rochat is a Director and Senior Vice  President of
Calvert  Asset  Management  Company,  Inc.  He is a  Trustee/Director  and
Senior  Vice  President  of First  Variable  Rate Fund,  Calvert  Tax-Free
Reserves,  Money Management Plus, The Calvert Fund, and Calvert  Municipal
Fund,  Inc.,  and is  primarily  responsible  for setting  the  investment
strategy of the trading  department,  utilizing over 20 years'  experience
in the  securities  and  investment  community.  Mr. Rochat joined Calvert
Group  in  1981  after   establishing  and  managing  the  municipal  bond
department at Donaldson,  Lufkin, & Jenrette Securities  Corporation.  Mr.
Martini,  a Director of Calvert  Group,  Ltd.,  and Senior Vice  President
and Chief Investment  Officer of Calvert Asset Management  Company,  Inc.,
oversees  management  of all Calvert  Group  portfolios.  He has extensive
experience in evaluating and purchasing municipal securities.


Calvert Group is one of the largest investment management firms in the
Washington, D.C. area.


Calvert Group,  Ltd.,  parent of the Fund's investment  advisor,  transfer
agent,  and  distributor,  is a subsidiary of Acacia Mutual Life Insurance
Company  of  Washington,   D.C.  Calvert  Group  is  one  of  the  largest
investment  management firms in the Washington,  D.C. area. Calvert Group,
Ltd. and its  subsidiaries  are located at 4550 Montgomery  Avenue,  Suite
1000N,  Bethesda,  Maryland 20814. As of December 31, 1995,  Calvert Group
managed and  administered  assets in excess of $4.8  billion and more than
200,000 shareholder and depositor accounts.


Calvert Asset Management serves as Advisor to the Fund.


Calvert  Asset  Management  Company,  Inc.  (the  "Advisor") is the Fund's
investment  advisor.   The  Advisor  provides  the  Fund  with  investment
supervision  and  management,  administrative  services and office  space;
furnishes  executive  and  other  personnel  to the  Fund;  and  pays  the
salaries  and  fees of all  Trustees  who are  affiliated  persons  of the
Advisor.  The  Advisor may also  assume and pay  certain  advertising  and
promotional  expenses  of the Fund and  reserves  the right to  compensate
broker-dealers   in  return  for  their   promotional  or   administrative
services.  For its  services  during  fiscal  year 1995,  the  Advisor was
entitled  to  and  did  receive,   pursuant  to  the  Investment  Advisory
Agreement, a fee equal to 0.60% of the Portfolio's average net assets.


<PAGE>

Calvert Administrative Services Company provides administrative services
for the Fund.

Calvert  Administrative  Services  Company  ("CASC"),  an affiliate of the
Advisor,  has been  retained  by  Calvert  Tax-Free  Reserves  to  provide
certain  administrative  services necessary to the conduct of its affairs,
including the preparation of regulatory  filings and shareholder  reports,
the daily  determination  of its net asset value per share and  dividends,
and the maintenance of its portfolio and general accounting  records.  For
providing such services,  CASC receives a total fee from Calvert  Tax-Free
Reserves of $200,000 per year,  allocated  among the  Portfolios  based on
assets.

Calvert Distributors, Inc. serves as underwriter to market the Fund's
shares.

Calvert  Distributors,  Inc. ("CDI") is the Fund's  principal  underwriter
and distributor.  Under the terms of its  underwriting  agreement with the
Fund,  CDI markets and  distributes  the Fund's shares and is  responsible
for payment of  commissions  and service  fees to  broker-dealers,  banks,
and  financial  services  firms,  preparation  of  advertising  and  sales
literature,  and  printing  and  mailing of  prospectuses  to  prospective
investors.

The transfer agent keeps your account records.

Calvert  Shareholder  Services,  Inc.  is the  Fund's  transfer,  dividend
disbursing and shareholder servicing agent.

SHAREHOLDER GUIDE

Opening An Account

You can buy shares of the Portfolio in several ways.

An account application accompanies this prospectus. A completed and
signed application is required for each new account you open, regardless
of the method you choose for making your initial investment. Additional
forms may be required from corporations, associations, and certain
fiduciaries. If you have any questions or need extra applications, call
your broker, or Calvert Group at 800-368-2748. Be sure to specify which
class of shares you wish to purchase.

Alternative Sales Options

The Portfolio offers two classes of shares:

Class A Shares - Front End Load Option

Class A shares  are sold  with a  front-end  sales  charge  at the time of
purchase.  Class A shares are not subject to a sales  charge when they are
redeemed.

Class C shares - Level Load Option

Class C shares  are sold  without a sales  charge at the time of  purchase
or redemption.


Class C shares have higher expenses

The  Portfolio  bears  some of the  costs  of  selling  its  shares  under
Distribution  Plans  adopted with  respect to its Class C shares  pursuant
to Rule 12b-1 under the 1940 Act.  Class A has not adopted a  Distribution
Plan.  The  Class C  Distribution  Plan  provides  for the  payment  of an
annual  distribution  fee to CDI of up to 0.75%,  plus a service fee of up
to 0.25%, for a total of 1.00% of the average daily net assets.


Considerations for deciding which class of shares to buy

Income  distributions  for Class A shares  will  probably  be higher  than
those  for  Class C  shares,  as a  result  of the  distribution  expenses
described  above.   (See  also  "Yield  and  Total  Return.")  You  should
consider  Class A shares if you qualify for a reduced  sales  charge under
Class  A or if you  plan  to  hold  the  shares  for  several  years.  The
Portfolio  will not normally  accept any purchase of Class C shares in the
amount of $1,000,000 or more.

Class A Shares

Class A shares are offered at net asset value plus a front-end sales
charge as follows:

<TABLE>
<CAPTION>

Amount of                  As a % of       As a % of      Allowed to Dealers
Investment                 offering        net amount     as a % of offering
                           price           invested       price

<S>                        <C>             <C>             <C>   
                                                                              
Less than $50,000          3.75%           3.90%           3.00%
$50,000 but less
than $100,000              3.00%           3.09%           2.25%
$100,000 but less
than $250,000              2.25%           2.30%           1.75%
$250,000 but less
than $500,000              1.75%           1.78%           1.25%
$500,000 but less
than $1,000,000            1.00%           1.01%           0.80%
$1,000,000 and over        0.00%           0.00%           0.25%*


   
**For new  investments  (new purchases but not exchanges) of $1 million or
more a  broker-dealer  will have the choice of being  paid a finder's  fee
by CDI in one of the following  methods:  (1) CDI may pay  broker-dealers,
on a  monthly  basis  for  12  months,  an  annual  rate  of up to  0.30%.
Payments   will   be   made   less   redemptions;   or  (2)  CDI  may  pay
broker-dealers  0.25%  of  the  amount  of  the  purchase;   however,  CDI
reserves  the  right to  recoup  any  portion  of the  amount  paid to the
dealer if the  investor  redeems  some or all of the shares from the Funds
within  thirteen  months  of the  time  of  purchase.  For either choice, 
quarterly  trailing compensation will begin in the thirteenth month.
    

</TABLE>

<PAGE>

Sales  charges on Class A shares may be reduced or  eliminated  in certain
cases. See Exhibit A to this prospectus.

The  sales  charge  is paid to CDI,  which  in turn  normally  reallows  a
portion to your  broker-dealer.  Upon written  notice to dealers with whom
it has  dealer  agreements,  CDI may  reallow  up to the  full  applicable
sales  charge.  Dealers to whom 90% or more of the entire  sales charge is
reallowed may be deemed to be  underwriters  under the  Securities  Act of
1933.

In  addition  to any sales  charge  reallowance,  your  broker-dealer,  or
other  financial   service  firm  through  which  your  account  is  held,
currently  will be paid  periodic  service fees at an annual rate of up to
0.15% of the  average  daily  net  asset  value of Class A shares  held in
accounts maintained by that firm.

Class C Shares

Class C shares are not available  through all dealers.  Class C shares are
offered  at net  asset  value,  without  a  front-end  sales  charge  or a
contingent  deferred sales charge.  Class C expenses are higher than those
of Class A.

Class C Distribution Plan


The  Portfolio has adopted a  Distribution  Plan with respect to its Class
C shares (the "Class C  Distribution  Plan"),  which provides for payments
at an annual rate of up to 1.00% of the  average  daily net asset value of
Class C shares,  to pay  expenses of the  distribution  and  servicing  of
Class C shares.  Amounts  paid by the Fund under the Class C  Distribution
Plan are  currently  used by CDI to pay  dealers and other  selling  firms
dealer-paid  quarterly  compensation  at an  annual  rate of up to  1.00%,
which may include a service  fee at an annual rate of up to 0.25%,  of the
average  daily net asset value of the  accounts  maintained  by that firm.
For the 1995 fiscal year, the Class C  Distribution  Plan expenses for the
Portfolio were 1.00%.


Arrangements with Broker-Dealers and Others (all classes)

CDI may also pay additional  concessions,  including non-cash  promotional
incentives,   such  as   merchandise  or  trips,   to  dealers   employing
registered  representatives  who  have  sold  or are  expected  to  sell a
minimum  dollar  amount of shares of the Fund and/or shares of other Funds
underwritten  by CDI.  CDI may make  expense  reimbursements  for  special
training  of  a  dealer's  registered   representatives,   advertising  or
equipment,  or  to  defray  the  expenses  of  sales  contests.   Eligible
marketing  and   distribution   expenses  may  be  paid  pursuant  to  the
Portfolio's Rule 12b-1 Distribution Plan.

Dealers or others may receive  different levels of compensation  depending
on which class of shares they sell.  Payments  pursuant to a  Distribution
Plan are included in the operating expenses of the class.

The Distribution Plan may be terminated at any time by a vote of the
Independent Trustees or by vote of a majority of the outstanding voting
shares of the respective class.

<PAGE>


                            HOW TO BUY SHARES
              BE SURE TO SPECIFY WHICH CLASS YOU ARE BUYING

Method               New Accounts                  Additional Investments

By Mail              $2,000 minimum                $250 minimum


                                    
                     Please make your check        Please make your check  
                     payable to the Portfolio      payable to the Portfolio
                     and mail it with your         and mail it with your       
                     investment slip to:           application to:         
                                                                               
                                                                               
                     Calvert Group                Calvert Group               
                     P.O. Box 419739              P.O. Box 419544         
                     Kansas City, MO              Kansas City, MO            
                     64141-6739                   64141-6544        
                                                                            

By Registered, Certified, or Overnight Mail:           
                                    
                    Calvert Group                 Calvert Group        
                    c/o NFDS, 6th Floor           c/o NFDS, 6th Floor  
                    1004 Baltimore                1004 Baltimore       
                    Kansas City, MO               Kansas City, MO      
                    64105-1807                    64105-1807           
                                   
Through Your Broker $2,000 minimum                $250 minimum


At the Calvert      Visit the Calvert Branch Office to
                    make investments by check.
Branch Office       See back cover page for the address.

<PAGE>

FOR ALL OPTIONS BELOW, PLEASE CALL YOUR BROKER, OR CALVERT GROUP AT
800-368-2745

By Exchange        $2,000 minimum          $250 minimum
(From your account in another Calvert Group Fund)

When opening an account by exchange, your new account must be
established with the same name(s), address and taxpayer identification
number as your existing Calvert account.

By Bank Wire       $2,000 minimum          $250 minimum

By Calvert Money   Not Available for       $50 minimum
Controller*        Initial Investment

*Please allow sufficient time for Calvert Group to process your initial
request for this service, normally 10 business days. The maximum
transaction amount is $300,000, and your purchase request must be
received by 4:00 p.m. Eastern time.

NET ASSET VALUE

Net asset value per share  ("NAV")  refers to the worth of one share.  NAV
is  computed  separately  for  each  class  by  adding  the  value  of all
portfolio  holdings,  plus other assets,  deducting  liabilities  and then
dividing  the  result by the number of shares  outstanding.  This value is
calculated at the close of the  Portfolio's  business day, which coincides
with the  closing of the  regular  session of the New York Stock  Exchange
(normally  4:00 p.m.  Eastern  time).  The  Portfolio is open for business
each day the New York Stock Exchange is open.

Portfolio   securities  and  other  assets  are  valued  based  on  market
quotations,  except that securities  maturing within 60 days are valued at
amortized  cost. If quotations  are not  available,  securities are valued
by a method that the Board of Trustees believes  accurately  reflects fair
value.

All  purchases of Portfolio  shares will be confirmed and credited to your
account in full and  fractional  shares  (rounded to the nearest 1/1000 of
a share).

WHEN YOUR ACCOUNT WILL BE CREDITED

Before you buy shares, please read the following information to make
sure your investment is accepted and credited properly.

Your  purchase  will be processed at the offering  price based on the next
net asset value calculated  after your order is received and accepted.  If
your  purchase is received by 4:00 p.m.  Eastern  time,  your account will
be  credited  on the day of receipt.  If your  purchase is received  after
4:00 p.m.  Eastern  time,  it will be credited the next business day. 
Check purchases received at the branch location will be credited the next
business day.  Any check purchase received without an investment slip may
cause delayed crediting.  Your purchases  must be made in U.S. dollars  and 
checks must be drawn on U.S. banks.  No cash will be  accepted.  The  Portfolio
reserves  the right to suspend  the  offering  of shares  for a period  of 
time or to reject  any specific  purchase  order.  If your check does not  
clear,  your  purchase will be  canceled  and you will be charged a $10 fee 
plus  costs  incurred by the  Portfolio.  When  you  purchase  by check  or 
with  Calvert  Money Controller,  those funds will be on hold for up to 10  
business  days from the date of receipt.  During that period,  redemptions 
against those funds will  not be  honored.  To  avoid  this  collection  
period,  you can wire federal funds from your bank, which may charge you a fee.

Certain financial  institutions or broker-dealers  which have entered into
a sales  agreement  with the  Distributor  may  enter  confirmed  purchase
orders on behalf of  customers by phone,  with payment to follow  within a
number of days of the order as  specified  by the  program.  If payment is
not received in the time  specified,  the financial  institution  could be
held liable for resulting fees or losses.

EXCHANGES

You may exchange shares of the Portfolio for shares of the same class of
other Calvert Group Funds.


If your investment  goals change,  the Calvert Group Family of Funds has a
variety of  investment  alternatives  that  includes  common  stock funds,
tax-exempt  and  corporate  bond  funds,   and  money  market  funds.  The
exchange  privilege  is a  convenient  way to buy shares in other  Calvert
Group  Funds in order to  respond  to  changes  in your goals or in market
conditions.  However,  the Portfolio is intended as a long-term investment
and not for frequent  short-term  trades.  To protect  performance  and to
minimize  costs,  Calvert  Group  discourages  frequent  exchanges and may
prohibit  additional  purchases of Portfolio  shares by persons engaged in
too many  short-term  trades.  Shareholders  (and those managing  multiple
accounts) who make two purchases  and two exchange  redemptions  of shares
of the same Fund or  Portfolio  during any  6-month  period  will be given
written  notice  that  they  may  be  prohibited  from  making  additional
investments.  These policies do not prohibit you from redeeming  shares of
the Funds and do not apply to trades  solely  among  money  market  funds.
Before you make an  exchange  from a Fund or  Portfolio,  please  note the
following:


Each exchange represents the sale of shares of one Fund or Portfolio and
the purchase of shares of another. Therefore, you could realize a
taxable gain or loss on the transaction.



<PAGE>

o    Call your broker or a Calvert  representative  for  information and a
prospectus  for any of  Calvert's  other Funds  registered  in your state.
Read  the  prospectus  of the Fund or  Portfolio  into  which  you want to
exchange for relevant information, including class offerings.

o    Complete  and sign an  application  for an  account  in that  Fund or
Portfolio,  taking care to register  your new account in the same name and
taxpayer  identification  number  as  your  existing  Calvert  account(s).
Exchange  instructions  may  then  be  given  by  telephone  if  telephone
redemptions  have been  authorized  and the shares are not in  certificate
form.

o    Shares  on which you have  already  paid a sales  charge  at  Calvert
Group and shares acquired by  reinvestment of dividends and  distributions
may be exchanged into another Fund at no additional charge.


For  purposes of the exchange  privilege,  effective  July 31,  1996,  the
Portfolio  is related  to Summit  Cash  Reserves  Fund by  investment  and
investor  services.  The  Portfolio  reserves  the right to  terminate  or
modify the exchange privilege in the future upon 60 days' written notice.


OTHER CALVERT GROUP SERVICES

Calvert Information Network

24 hour total return quotations and prices

Calvert Group has a  round-the-clock  telephone service that lets existing
customers  use  a  push  button  phone  to  obtain   prices,   performance
information, account balances, and authorize certain transactions.

Calvert Money Controller

Calvert Money Controller eliminates the delay of mailing a check or the
expense of wiring funds. You can request this free service on your
application.


This  service  allows you to  authorize  electronic  transfers of money to
purchase  or  sell  shares.  You  use  Calvert  Money  Controller  like an
"electronic  check" to move  money  ($50 to  $300,000)  between  your bank
account and your  Calvert  Group  account  with one phone call.  Allow two
business  days after the call for the  transfer to take  place;  for money
recently  invested,  allow normal check  clearing  time (up to 10 business
days) before redemption proceeds are sent to your bank.


You  may  also  arrange  systematic   monthly  or  quarterly   investments
(minimum  $50) into your Calvert Group  account.  After you give us proper
authorization,  your  bank  account  will  be  debited  to  purchase  Fund
shares.  A  debit  entry  will  appear  on  your  bank  statement.   Share
purchases  made through  Calvert Money  Controller  will be subject to the
applicable  sales  charge.  If you  would  like to make  arrangements  for
systematic  monthly  or  quarterly  redemptions  from your  Calvert  Group
account,  call  your  broker  or  Calvert  Group  for a  Money  Controller
Application.

<PAGE>

Telephone Transactions

Calvert may record all telephone calls.

You may purchase,  redeem, or exchange shares,  wire funds and use Calvert
Money  Controller  by  telephone  if  you  have   pre-authorized   service
instructions.  You  automatically  have  telephone  privileges  unless you
elect  otherwise.  The Fund, the transfer  agent and their  affiliates are
not liable for acting in good  faith on  telephone  instructions  relating
to  your  account,  so  long  as  they  follow  reasonable  procedures  to
determine that the telephone  instructions  are genuine.  Such  procedures
may include  recording  the  telephone  calls and  requiring  some form of
personal  identification.  You should  verify the  accuracy  of  telephone
transactions immediately upon receipt of your confirmation statement.

Optional Services


Complete the application for the easiest way to establish services.


The easiest way to  establish  optional  services  on your  Calvert  Group
account  is to select  the  options  you  desire  when you  complete  your
account  application.  If you wish to add  other  options  later,  you may
have  to  provide  Calvert  Group  with   additional   information  and  a
signature   guarantee.   Please  call   Calvert   Investor   Relations  at
800-368-2745 for further  assistance.  For our mutual  protection,  we may
require a signature guarantee on certain written transaction  requests.  A
signature  guarantee verifies the authenticity of your signature,  and may
be obtained from any bank,  trust company,  savings and loan  association,
credit union,  broker-dealer  firm or member of a domestic stock exchange.
A signature guarantee cannot be provided by a notary public.

Householding of General Mailings


Householding reduces Fund expenses and saves paper and trees for the
environment.


If you have  multiple  accounts  with  Calvert,  you may receive  combined
mailings of some shareholder  information,  such as semi-annual and annual
reports.  Please contact  Calvert  Investor  Relations at  800-368-2745 to
receive additional copies of information.

Special Services and Charges

The Portfolio pays for shareholder  services but not for special  services
that  are  required  by a  few  shareholders,  such  as a  request  for  a
historical  transcript  of an  account.  You  may  be  required  to  pay a
research fee for these special services.

If you are  purchasing  shares  of the  Portfolio  through  a  program  of
services  offered by a  securities  dealer or financial  institution,  you
should read the program  materials in  conjunction  with this  Prospectus.
Certain  features of the Portfolio may be modified in these programs,  and
administrative  charges may be imposed by the  broker-dealer  or financial
institution for the services rendered.

SELLING YOUR SHARES

You may redeem all or a portion of your shares on any business  day.  Your
shares  will be  redeemed  at the next net asset  value  calculated  after
your redemption  request is received and accepted.  See below for specific
requirements  necessary to make sure your redemption  request is accepted.
Remember  that the  Portfolio  may hold payment on the  redemption of your
shares until it is reasonably  satisfied  that  investments  made by check
or by Calvert  Money  Controller  have been  collected  (normally up to 10
business days).

<PAGE>

Redemption Requirements To Remember

To ensure acceptance of your redemption request, please follow the
procedures described here and below.


Once your shares are  redeemed,  the proceeds will normally be sent to you
on  the  next  business  day,  but  if  making  immediate   payment  could
adversely  affect  the  Portfolio,  it may  take  up to  seven  (7)  days.
Calvert Money  Controller  redemptions  generally will be credited to your
bank account on the second  business  day after your phone call.  When the
New York Stock  Exchange  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.


Minimum account balance is $1,000 per Portfolio.

Please  maintain  a  balance  in  your  account  of at  least  $1,000  per
Portfolio,  per class.  If, due to  redemptions,  the account  falls below
$1,000,  or you  fail to  invest  at least  $1,000,  your  account  may be
closed and the proceeds  mailed to you at the address of record.  You will
be given  notice  that your  account  will be closed  after 30 days unless
you make an  additional  investment  to increase  your account  balance to
the $1,000 minimum per Portfolio.

HOW TO SELL YOUR SHARES

By Mail To:

Calvert Group
P.O. Box 419544
Kansas City, MO
64179-6544

You may redeem  available  shares from your account at any time by sending
a letter of  instruction,  including  your name,  account and Fund number,
the  number of shares  or dollar  amount,  and where you want the money to
be sent.  Additional  requirements,  below, may apply to your account. The
letter of instruction must be signed by all required  authorized  signers.
If you want the  money  to be wired to a bank not  previously  authorized,
then a voided  bank check must be  enclosed  with your  letter.  If you do
not have a voided  check or if you would like  funds  sent to a  different
address or another person, your letter must be signature guaranteed.


Type of                    Requirements
Registration

Corporations               Letter of instruction and a corporate resolution,
Associations               signed by person(s) authorized to act on the         
                           account, accompanied by signature guarantee(s).
                    
                         
Trusts                     Letter of instruction signed by the Trustee(s)
                           (as Trustee), with a signature guarantee. 
                           (If the Trustee's name is not registered on your
                           account, provide a copy of the trust document,
                           certified within the last 60 days.)

By Telephone

Please  call  800-368-2745.  You may redeem  shares  from your  account by
telephone  and have your money  mailed to your  address of record or wired
to an address or bank you have  previously  authorized.  A charge of $5 is
imposed  on  wire   transfers   of  less  than  $1,000.   See   "Telephone
Transactions" on page ___.

Calvert Money Controller

Please  allow  sufficient  time for Calvert  Group to process your initial
request  for  this  service  (normally  10  business  days).  You may also
authorize   automatic   fixed   amount   redemptions   by  Calvert   Money
Controller.  All  requests  must be  received by 4:00 p.m.  Eastern  time.
Accounts cannot be closed by this service.

Exchange to Another Calvert Group Fund

You must meet the  minimum  investment  requirement  of the other  Calvert
Group Fund or  Portfolio.  You can only  exchange  between  accounts  with
identical  names,  addresses and taxpayer  identification  number,  unless
previously authorized with a signature-guaranteed letter.

Systematic Check Redemptions

If you  maintain  an account  with a balance  of $10,000 or more,  you may
have up to two (2)  redemption  checks for a fixed  amount  sent to you on
the 15th of each month,  simply by sending a letter with all  information,
including your account number,  and the dollar amount ($100  minimum).  If
you would like a regular  check  mailed to another  person or place,  your
letter must be signature guaranteed.

Through your Broker

If your  account  is  held in your  broker's  name  ("street  name"),  you
should  contact  your  broker  directly  to  transfer,  exchange or redeem
shares.

<PAGE>

DIVIDENDS, CAPITAL GAINS AND TAXES

Dividends from the Portfolio's net investment income are declared and
paid monthly.

Net  investment  income  consists of the interest  income,  net short-term
capital  gains,  if any, and dividends  declared and paid on  investments,
less expenses.  Distributions  of the Portfolio's  net short-term  capital
gains  (treated  as  dividends  for tax  purposes)  and its net  long-term
capital gains,  if any, are normally  declared and paid by the Fund once a
year;  however,   the  Portfolio  does  not  anticipate  making  any  such
distributions  unless available  capital loss carryovers have been used or
have  expired.  Dividend  and  distribution  payments  will  vary  between
classes; dividend payments will generally be higher for Class A shares.

Dividend Options


Dividends and any distributions  are automatically  reinvested in the same
Portfolio at net asset value (no sales  charge),  unless you elect to have
the  dividends  of $10 or more paid in cash (by check or by Calvert  Money
Controller).  Dividends and  distributions  may be automatically  invested
in an identically  registered  account with the same account number in any
other  Calvert  Group Fund or Portfolio at net asset value.  If reinvested
in the same  Fund  account,  new  shares  will be  purchased  at net asset
value on the  reinvestment  date,  which is generally 1 to 3 days prior to
the  payment  date.  You  must  be a  shareholder  on the  record  date to
receive  dividends.  You  must  notify  the Fund in  writing  prior to the
record  date  to  change  your  payment  options.  If you  elect  to  have
dividends and/or  distributions  paid in cash, and the U.S. Postal Service
cannot deliver the check,  or if it remains  uncashed for six months,  it,
as well as future  dividends  and  distributions,  will be  reinvested  in
additional shares.


"Buying a Dividend"


At the time of  purchase,  the share  price of the  Portfolio  may reflect
undistributed  income,   capital  gains  or  unrealized   appreciation  of
securities.   Any  capital  gains  from  these  amounts  which  are  later
distributed  to  you  are  fully  taxable.   On  the  record  date  for  a
distribution,  the  Portfolio's  share  value is  reduced by the amount of
the  distribution.  If you buy shares just before the record date ("buying
a  dividend")  you will pay the full price for the shares and then receive
a portion of the price back as a taxable distribution.

Federal Taxes

Dividends  derived  from  interest  on  municipal  obligations  constitute
exempt-interest  dividends,  on  which  you are  not  subject  to  federal
income tax.  However,  dividends  which are from taxable  interest and any
distributions  of  short-term  capital gain are taxable to you as ordinary
income.  If the Portfolio  makes any  distributions  of long-term  capital
gains,  then  these  are  taxable  to  you  as  long-term  capital  gains,
regardless  of how long you held your shares of the  Portfolio.  Dividends
attributable  to  interest  on  certain  private  activity  bonds  must be
included  in  federal  alternative  minimum  tax for  individuals  and for
corporations.

If any taxable  income or gains are paid, in January,  the Portfolio  will
mail you Form  1099-DIV  indicating  the federal  tax status of  dividends
paid to you by the Portfolio during the past year.

You may  realize  a  capital  gain or  loss  when  you  redeem  (sell)  or
exchange shares.

If you  sell or  exchange  your  Fund  shares  you  will  have a short  or
long-term  capital  gain or loss,  depending  on how long  you  owned  the
shares  which were sold.  In  January,  the Fund will mail you Form 1099-B
indicating the proceeds from all sales,  including  exchanges.  You should
keep  your  annual  year-end  account  statements  to  determine  the cost
(basis) of the shares to report on your tax returns.

State and Local Taxes

Dividends  derived  from  interest on Vermont  state or local  obligations
are exempt  from  Vermont  personal  income  tax,  as are  dividends  from
obligations  issued  by  certain  territories,  such as Puerto  Rico.  The
Portfolio  will  advise  you each  January  of the  percent  of  dividends
qualifying  for this  exemption.  You should consult your tax advisor with
regard to how certain dividends affect you.

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 may  require  the  Portfolio  to  withhold  31% of your
dividends and certain  redemptions.  In addition,  you may be subject to a
fine.  You  will  also be  prohibited  from  opening  another  account  by
exchange.  If this TIN  information  is not received  within 60 days after
your account is  established,  your account may be redeemed at the current
NAV on the  date of  redemption.  The  Portfolio  reserves  the  right  to
reject  any new  account  or any  purchase  order for  failure to supply a
certified TIN.

<PAGE>

                                EXHIBIT A
==========================================================================
REDUCED SALES CHARGES (CLASS A ONLY)

You may qualify for a reduced sales charge through several purchase
plans available. You must notify the Fund at the time of purchase to
take advantage of the reduced sales charge.


Right of Accumulation
The  sales  charge  is  calculated  by taking  into  account  not only the
dollar  amount of a new  purchase  of shares,  but also the higher of cost
or current  value of shares  previously  purchased in Calvert  Group Funds
that impose  sales  charges.  This  automatically  applies to your account
for each new purchase.


Letter of Intent
If you plan to  purchase  $50,000 or more of Fund  shares over the next 13
months,  your sales  charge may be reduced  through a "Letter of  Intent."
You pay the lower sales  charge  applicable  to the total  amount you plan
to invest  over the  13-month  period,  excluding  any money  market  fund
purchases.  Part of your shares will be held in escrow,  so that if you do
not  invest the amount  indicated,  you will have to pay the sales  charge
applicable   to  the   smaller   investment   actually   made.   For  more
information, see the Statement of Additional Information.


Group Purchases
If you are a member of a qualified  group,  you may purchase shares of the
Fund at the  reduced  sales  charge  applicable  to the  group  taken as a
whole.  The sales  charge is  calculated  by taking into  account not only
the  dollar  amount of the  shares  you  purchase,  but also the higher of
cost or current value of shares  previously  purchased and currently  held
by other members of your group.

A "qualified  group" is one which (i) has been in existence  for more than
six  months,  (ii) has a purpose  other than  acquiring  Fund  shares at a
discount,  and (iii)  satisfies  uniform  criteria  which  enable  CDI and
dealers   offering   Fund  shares  to  realize   economies   of  scale  in
distributing  such  shares.  A  qualified  group  must  have  more than 10
members,   must  be  available  to  arrange  for  group  meetings  between
representatives  of CDI or dealers  distributing  the Fund's shares,  must
agree to  include  sales and other  materials  related  to the Fund in its
publications  and  mailings  to  members  at  reduced or no cost to CDI or
dealers,  and must seek to arrange  for  payroll  deduction  or other bulk
transmission  of  investments  to the  Fund.  Members  of a group  are not
eligible for a Letter of Intent.


Other Circumstances
There is no sales  charge on shares of any fund  (portfolio  or series) of
the Calvert  Group of Funds sold to: (1)  current  and retired  members of
the Board of  Trustees/Directors  of the Calvert Group of Funds,  (and the
Advisory  Council of the Calvert Social  Investment  Fund); (2) directors,
officers and employees of the Advisor,  Distributor,  and their affiliated
companies;  (3)  directors,  officers and  registered  representatives  of
brokers  distributing  the Fund's shares;  and immediate family members of
persons  listed in (1),  (2),  or (3)  above;  (4)  dealers,  brokers,  or
registered  investment  advisors that have entered into an agreement  with
CDI providing  specifically  for the use of shares of the Fund  (Portfolio
or Series) in  particular  investment  programs  or  products  (where such
program or product  already has a fee charged  therein) made  available to
the clients of such dealer,  broker,  or  registered  investment  advisor;
(5) trust  departments of banks or savings  institutions for trust clients
of such bank or savings  institution;  and (6) purchases  placed through a
broker  maintaining  an  omnibus  account  with  the  Fund  (Portfolio  or
Series)  and  the  purchases  are  made  by  (a)  investment  advisors  or
financial   planners  placing  trades  for  their  own  accounts  (or  the
accounts of their  clients) and who charge a  management,  consulting,  or
other fee for their services;  or (b) clients of such investment  advisors
or  financial  planners  who place  trades for their own  accounts if such
accounts are linked to the master  account of such  investment  advisor or
financial  planner on the books and  records  of the  broker or agent;  or
(c)  retirement  and deferred  compensation  plans and trusts,  including,
but not limited to,  those  defined in Section 401(a) or Section 403(b) of 
the I.R.C., and "rabbi trusts."


Dividends and Capital Gain Distributions from other Calvert Group Funds
You may prearrange to have your  dividends and capital gain  distributions
from  another  Calvert  Group  Fund  automatically   invested  in  another
account with no additional sales charge.

Reinstatement Privilege
If you redeem  Fund  shares and then  within 30 days decide to reinvest in
the same Fund,  you may do so at the net asset value next  computed  after
the reinvestment  order is received,  without a sales charge.  You may use
the  reinstatement  privilege  only once.  The Fund  reserves the right to
modify or eliminate this privilege.


<PAGE>

TABLE OF        Fund Expenses                        Alternative Sales Options
CONTENTS        Financial Highlights                 When Your Account
                Investment Objective and Policies    Will Be Credited
                Yield and Total Return               Exchanges
                Management of the Fund               Other Calvert Group
                SHAREHOLDER GUIDE:                   Services
                How to Buy Shares                    Selling Your Shares
                Net Asset Value                      How to Sell Your
                Shares                               Dividends, Capital   
                                                     Gains and Taxes      
                                                     Exhibit A - Reduced  
                                                     Sales Charges        
                                                       


To Open an Account:                                  Prospectus
     800-368-2748 April 30, 1996


                                                     CALVERT TAX-FREE
                                                     RESERVES VERMONT MUNICIPAL
                                                     PORTFOLIO
                                                     
Performance and Prices:
Calvert Information Network
24 hours, 7 days a week
     800-368-2745

Service for Existing Accounts:
Shareholders      800-368-2745
Brokers           800-368-2746

TDD for Hearing Impaired:
     800-541-1524

Branch Office:
4550 Montgomery Avenue
Suite 1000N
Bethesda, Maryland 20814

Registered, Certified
or Overnight Mail:
Calvert Group
c/o NFDS, 6th Floor
1004 Baltimore
Kansas City, MO 64105

Calvert Group Web-Site
Address: http://www.calvertgroup.com

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





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