CALVERT TAX FREE RESERVES
N-30D/A, 1996-09-11
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<PAGE>
 

                                    CALVERT

                                    TAX-FREE

                                    RESERVES


                                    SEMI-ANNUAL
                                    REPORT
                                    JUNE 30, 1996






INVESTING with VISION [LOGO--CALVERT GROUP] A member of the Acecia Group

                                    




<PAGE>
 
                           CALVERT TAX-FREE RESERVES

Dear Investor:

  Interest rates moved a bit higher during the first six months of 1996. The
nation's economy continued to expand slowly, with Gross Domestic Product
increasing by an annualized 2.5%, but investors feared that stronger growth and
possibly higher inflation were on the horizon.

  The rise in rates did not stall the stock market's advance. The Standard &
Poor's 500 Stock Index, a grouping of mostly large-company stocks, turned in a
six-month gain of 10.10%.

  In general, short-term fixed-income investments were able to eke out slightly
positive returns for the six-months ended June 30, as higher yields more than
offset declining prices. Intermediate- and longer-term fixed-income investments
suffered more in response to the rise in rates and, on average, reported flat to
negative year-to-date returns.

Fund Performance and Strategy Review

  After a protracted period of declining yields and rising prices, the municipal
market changed course early in this reporting period. Municipal bond prices
started to slip in February as investors demanded higher yields to compensate
for their expectations of stronger economic growth and belief that the Federal
Reserve would shift to a tighter monetary policy. Yields on municipal money
market securities trended higher at first, but fell back in April and May to
close the period about where they began.

                             [GRAPH APPEARS HERE]
               Graph shows Municipal Rates for 1, 7 and 20 year
                 AA General Obligations between 6/95 and 6/96.

  Municipal money market yields were not able to keep pace with those of taxable
money market securities because money managers looking to reduce the interest
rate sensitivity of their municipal portfolios increased their holdings of these
very short-term securities. The stronger demand kept a lid on yields. In the
taxable fixed-income market, this level of activity would be insignificant
because of the greater supply of money market securities. But the supply of
municipal money market securities is much thinner, therefore demand factors have
more of an impact on yields.


SEMI-ANNUAL REPORT (UNAUDITED]                     CALVERT TAX-FREE RESERVES - 1
<PAGE>
 
Money Market Portfolio

     The Portfolio's yield on June 30, 1996 (Class O shares) was slightly below
its level at the close of 1995 due to continued low interest rates, but it
remained above the yield on an average of similar funds. The Portfolio's
maturity was a very short 21 days on June 30, 1996, little changed from its 27
day level at the start of this reporting period.

[GRAPH APPEAR HERE]

MONEY MARKET PORTFOLIO
COMPOUND DIVIDEND YIELD

Six Months Ended      Six Months Ended   Six Months Ended 
   12/13/95              6/30/96            6/30/96

   1.95%                 1.68%               1.35%
   1.62%                 1.44%               1.44%

0.0%      0.5%         1.0%          1.5%           2.0%


[_] Tax-Free Reserve Money Market (Class 0)
[_] Tax-Free Reserve Money Market (Class MMP)
[_] Lipper Tax-Exempt Money Market Avg.

Limited-Term Portfolio

     For both the six- and 12-month periods, the Portfolio's return was above
that of an average of similar funds. The Portfolio's weighted average maturity
at the close of this reporting period was 331 days, 20 days shorter than it was
at year-end 1995 and near the low end of its usual maturity range. The
Portfolio's shorter maturity lessened the impact of rising rates on total
return. We made a slight adjustment to the Portfolio's mix of securities by
credit quality. A greater percentage of assets were invested in higher quality
issues, those rated AAA or AA by Moody's Investors Service, because we did not
believe the marginally higher yields available on lesser quality issues
compensated for the increased credit risk.

LIMITED-TERM PORTFOLIO
INVESTMENT PERFORMANCE

Periods Ended 6/30/96              6 Months  12 Months
- -----------------------------------------------------

Limited-Term Portfolio             1.85%     4.17%

Lipper Short Muni
   Debt Funds Avg.                 1.21%     4.04%

Investment performance is for Class A shares and does not reflect the deduction
of any front-end sales charge.

Long-Term Portfolio

     The Portfolio's 12-month return was positive and in line with municipal
securities historical average annual returns. For the six-month period, the
higher level of interest income was not enough to offset the decline in bond
prices, and the Portfolio's return was negative. 
     Of the three Tax-Free Reserve's Portfolios, the Long-Term Portfolio has the
greatest interest rate sensitivity. This means investors can expect the
Portfolio to substantially outperform short-term fixed-income investments when
rates decline

2 - CALVERT TAX-FREE RESERVES                    SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
and substantially underperform these investments when rates rise. At the close
of this reporting period, the Portfolio's weighted average maturity was 18
years, roughly the same as its position six months prior to the close of the
period and just a bit lower than its position 12 months earlier than the close
of the period.


<TABLE>
<CAPTION>  
              ----------------------------------------------------- 
                             Long-Term Portfolio
                            Investment Performance

                Periods Ended 6/30/96     6 Months    12 Months
                -----------------------------------------------
                <S>                        <C>          <C> 
                Long-Term Portfolio        -1.68%       5.54%
                
                Lipper General Muni
                  Muni Fund Avg.           -1.38%       5.67%

                  Investment performance is for Class A shares
                  and does not reflect the deduction of any
                  front-end sales charge.
              ----------------------------------------------------- 

</TABLE> 
Outlook

  We anticipate continued modest economic growth. Gross Domestic Product will
likely continue to expand at an annualized rate of 2.5% or a bit higher for the
remainder of the year. This could be slightly above the Federal Reserve's target
growth rate, but not so much so that we would expect rates to move dramatically
higher.

  Radical suggestions for tax reform had been hurting the municipal market and
these now appear to have been put on the sidelines. And, since the close of this
reporting period, investors in stocks have encountered significantly greater
volatility. A riskier stock market could enhance the appeal of bond and money
market securities.

  In our view the municipal market is now fairly valued, and our outlook for the
balance of 1996 is positive.

  We appreciate your investment in the Calvert Tax-Free Reserves Portfolios.

Sincerely,



/s/ David Rochat
David Rochat
Senior Vice President
July 31, 1996



SEMI-ANNUAL REPORT (UNAUDITED)                     CALVERT TAX-FREE RESERVES - 3


<PAGE>
 
                IMPORTANT NOTICE TO INVESTORS IN CLASS C SHARES

  On or about October 28, 1996, all outstanding Class C accounts in the Calvert
Tax-Free Reserves Portfolios will be converted into an equal dollar amount of
Class A shares. The shares will be converted at net asset value with no sales
charge. This exchange will have a positive impact on your return, since Class A
shares have a lower expense ratio than Class C shares.

  You do not need to take any action. The conversion will take place
automatically. The conversion will be a non-taxable event, meaning you should
not incur any taxes as a result.

  No new Class C accounts may be opened after August 23, 1996. Owners of Class C
accounts opened on or before that date may continue to purchase Class C shares
for existing Class C accounts until the date of conversion.


                               RATINGS BREAKDOWN

                            MONEY MARKET PORTFOLIO

                      First Tier                Second Tier
                          90%                       10%

                               [ART - PIE CHART]




      LIMITED-TERM PORTFOLIO                        LONG-TERM PORTFOLIO

   Cash           AAA/Aaa     AA/Aa         Cash      BBB/Baa   AAA/Aaa   AA/Aa
Equivalents         11%        7%        Equivalents    19%       24%      22%
    32%                                      5%

        BBB/Baa         A/a                            NR         A/A
          38%           12%                            14%        16%
                               [ART - PIE CHART]





NR: Obligation is not rated by a commercial credit rating service, such as
Moody's Investors Services, Inc., or Standard & Poor's Corporation; obligation
has been determined to be of appropriate quality for the Portfolio by Calvert
Asset Management Company, Inc., the Investment Advisor.

All securities in Calvert Group money market funds are eligible securities under
rule 2a-7 of the Investment Company Act of 1940. First Tier Securities are
eligible securities rated in the highest rating category for short-term debt
obligations by at least two of the Nationally Recognized Statistical Ratings
Organizations. Second Tier Securities are eligible securities not in the First
Tier.


4-CALVERT TAX-FREE RESERVES                       SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                              Portfolio Statistics

                           Weighted Average Maturity

<TABLE>
<CAPTION> 
                                                          12/31/95     6/30/96  
  ------------------------------------------------------------------------------
  <S>                                                     <C>         <C>     
  Money Market Portfolio                                   27 days     21 days  
  Limited-Term Portfolio                                  351 days    331 days  
  Long-Term Portfolio                                     18 years    18 years   
</TABLE>

                              Money Market Yields

<TABLE> 
<CAPTION>
  Seven-Day Compounded (Effective)                                     6/30/96
  ------------------------------------------------------------------------------
  <S>                                                                  <C> 
  Money Market Portfolio (Class O)                                       3.22%
  Money Market Portfolio (Class MMP)                                     2.51%
</TABLE> 

                                   SEC Yields

<TABLE>
<CAPTION>
                                                           Class A     Class C  
  Thirty Days Ended                                        6/30/96     6/30/96  
  ------------------------------------------------------------------------------
  <S>                                                      <C>         <C>     
  Limited-Term Portfolio                                     3.99%       3.32% 
  Long-Term Portfolio                                        5.11%       3.73%  

  Yields assume reinvestment of dividends.
</TABLE>

                          Average Annual Total Returns

<TABLE>
<CAPTION>
                                                                         Since                
  Periods Ended 6/30/96               1 Year    5 Year    10 Year    Inception 
  ------------------------------------------------------------------------------
  <S>                                 <C>       <C>       <C>        <C>       
  Class A Shares                                                               
  Limited-Term Portfolio (3/81)         2.07%     3.95%      5.03%        6.30%
  Long-Term Portfolio (8/82)            1.57%     6.49%      6.69%        8.13%
                                                                               
  Class C Shares                                                               
  Limited-Term Portfolio (3/94)         3.51%       NA         NA         3.24%
  Long-Term Portfolio (3/94)            3.95%       NA         NA         3.46%
</TABLE>

  SEMI-ANNUAL REPORT (UNAUDITED)                 CALVERT TAX-FREE RESERVES - 5

<PAGE>
 
                              Portfolio Statistics
                            Performance Comparisons

                             Money Market Portfolio
             Change in value of a hypothetical $10,000 investment.

                             [GRAPH APPEARS HERE]
         
<TABLE> 
<CAPTION> 

<S>                          <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C> 
                             6/30/96  6/30/95  6/30/94  6/30/93  6/30/92  6/30/91  6/30/90  6/30/89  6/30/88  6/30/87   7/1/86
                             -------  -------  -------  -------  -------  -------  -------  -------  -------  -------  -------  
CTFR M.M.(O)                 $15,325  $14,784  $14,262  $13,925  $13,569  $13,029  $12,340  $11,628  $10,951  $10,444  $10,000 
</TABLE>                                                          

   
                             Limited-Term Portfolio
             Comparison of change in value of $10,000 investment.*

                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

<S>                          <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C> 
CTFR LTD TERM                $16,340  $15,686  $15,007  $14,594  $13,970  $13,187  $12,397  $11,641  $10,923  $10,355  $ 9,625  

LEHMAN MUNICIPAL BD          $22,717  $21,631  $19,219  $19,472  $17,420  $15,276  $13,799  $12,795  $11,401  $10,552  $10,000 

LIPPER SORT MUNI DEBT AVG.   $17,758  $16,716  $16,420  $15,450  $14,517  $13,388  $12,579  $11,756  $11,110  $10,785  $10,000  
</TABLE> 

                              Long-Term Portfolio
             Comparison of change in value of $10,000 investment.*

                             [GRAPH APPEARS HERE]
<TABLE> 
<CAPTION> 

<S>                          <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C>      <C> 
CTFR LONG TERM               $19,101  $18,098  $16,544  $16,432  $14,964  $13,430  $12,465  $11,926  $10,652  $10,153  $ 9,625  

LEHMAN MUNICIPAL BD          $22,717  $21,631  $19,219  $19,472  $17,420  $15,276  $13,799  $12,795  $11,401  $10,552  $10,000  
</TABLE> 

  * The Lehman Municipal Bond Index has a maturity of approximately 20 years,
which is comparable to that of the Long-Term Portfolio but much longer than that
                         of the Limited-Term Portfolio.

Total returns assume reinvestment of dividends and, for Class A shares, reflect
the deduction of each fund's maximum front-end sales charge of 2.00% for the
Limited-Term Portfolio and 3.75% for the Long-Term Portfolio. No sales charge
has been applied to the indices used for comparison. The value of an investment
in Class A (Class O for Money Market Portfolio) shares is plotted in the line
graphs. The value of an investment in Class C (Class MMP for Money Market
Portfolio) shares would be different. Past performance is no guarantee of future
returns.

6--CALVERT TAX-FREE RESERVES                      SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 

                                    MONEY MARKET PORTFOLIO
                                    STATEMENT OF NET ASSETS
                                         JUNE 30, 1996

<TABLE> 
<CAPTION> 

PRINCIPAL
AMOUNT                                                                                  VALUE
- ------------------------------------------------------------------------------------------------
<S>         <C>                                                                       <C> 
                                 Municipal Obligations - 98.4%
Alabama - 1.3%
            Alabama MFH Revenue VRDN:
$3,600,000    3.50%, 12/1/03, LOC:  Amsouth Bank...................................   $3,600,000
   825,000    Series A, 3.50%, 4/1/24, LOC:  Southtrust Bank, AL...................      825,000
 4,750,000  Alabama IDA Revenue VRDN, 3.65%, 9/1/04,
              LOC:  Southtrust Bank, AL............................................    4,750,000
 4,000,000  Auburn IDA Board Revenue VRDN, Series A, 6.35%, 12/1/16,
              LOC:  Daiwa Bank, Ltd................................................    4,000,000
 2,565,000  Birmingham Baptist Medical Center Special Care Facilities Financing
              Authority Revenue VRDN, 3.85%, 9/1/20, LOC:  Fuji Bank, Ltd..........    2,565,000
 3,100,000  Haleyville IDA Board Revenue VRDN, 3.65%, 11/1/04,
              LOC:  Columbus B&T...................................................    3,100,000
 4,000,000  Wynlakes Government Utility Authority Revenue VRDN, 3.80%, 5/1/06,
              LOC:  Amsouth Bank...................................................    4,000,000


Arizona - 5.9%
42,900,000  Apache County IDA Revenue VRDN, Series B, 3.55%, 10/1/21,
              LOC:  Bank of Tokyo-Mitsubishi, Ltd..................................   42,900,000
 2,050,000  Casa Grande IDA Revenue VRDN, 3.80%, 9/1/07,
              LOC:  Banque National De Paris.......................................    2,050,000
 7,450,000  Glendale IDA Revenue VRDN, 3.85%, 1/1/20, LOC: Sumitomo T&B............    7,450,000
 5,415,000  Maricopa County IDA Revenue VRDN, 3.80%, 10/1/08,
              C/LOC:  Great American FSB...........................................    5,415,000
            Maricopa County Pollution Control Revenue VRDN:
10,100,000    3.60%, 12/1/14, LOC:  Credit Suisse..................................   10,100,000
 3,000,000    3.70%, 7/1/14, LOC:  Citibank........................................    3,000,000
 9,900,000  Pinal County IDA Revenue VRDN, 3.55%, 12/1/05,
              LOC:  Industrial Bank of Japan.......................................    9,900,000
 8,400,000  Prescott IDA Revenue VRDN, 4.00%, 12/1/14,
              GA:  Household Finance Corp..........................................    8,400,000
15,400,000  Tucson IDA Revenue VRDN, 3.675%, 12/1/07,
              C/LOC:  Mercury S&L..................................................   15,400,000


Arkansas - 0.2%
 3,500,000  Little River County Solid Waste Disposal Revenue VRDN, 3.60%,
              11/1/26, LOC:  Sumitomo Bank, Ltd....................................    3,500,000


California - 19.9%
11,700,000  California Educational Facilities Authority Revenue VRDN, 4.35%,
              10/1/09, LOC:  Long Term Credit Bank of Japan........................   11,700,000
 8,085,000  California VYS Housing Finance Authority Guaranteed Mortgage
              Obligation Revenue VRDN, Series A, GNMA Collateral, 4.05%,
              7/1/25, LOC: Sumitomo Bank, Ltd......................................    8,085,000
 6,800,000  Fremont MFH Revenue VRDN, 3.30%, 9/1/07,
              LOC:  Industrial Bank of Japan.......................................    6,800,000
</TABLE> 



SEMI-ANNUAL REPORT (UNAUDITED)                     CALVERT TAX-FREE RESERVES - 7


<PAGE>
 
<TABLE>
<CAPTION> 

PRINCIPAL
AMOUNT                                                                                VALUE
- --------------------------------------------------------------------------------------------------
<S>                                                                                  <C>    
CALIFORNIA (CONT'D)
 $8,800,000   Fresno MFH Revenue VRDN, 4.50%, 5/1/15, LOC: Tokai Bank, Ltd. ....      $8,800,000
  4,000,000   Hemet MFH Authority Revenue VRDN, 3.60%, 7/1/06,
                C/LOC: Mercury S&L .............................................       4,000,000
  7,900,000   Irvine Public Facilities Revenue VRDN, 3.10%, 11/1/10,
                LOC: National Westminster Bank .................................       7,900,000
    950,000   Lancaster MFH Revenue VRDN, 4.30%, 5/1/17,
                C/LOC: Mercury S&L .............................................         950,000
 15,800,000   Los Angeles County Convention Center Puttable Floating
                Option VRDN, 3.45%, 8/15/18, INSUR: MBIA .......................      15,800,000
  3,400,000   Los Angeles County IDA Board Revenue VRDN, 4.25%, 7/1/14,
                LOC: Tokai Bank, Ltd. ..........................................       3,400,000
              Los Angeles County MFH Revenue VRDN:
 13,781,000     3.25%, 5/1/07, LOC: Industrial Bank of Japan ...................      13,781,000
  1,400,000     3.40%, 12/1/16, C/LOC: Mercury S&L .............................       1,400,000
 15,600,000     3.75%, 8/1/19, LOC: Fuji Bank, Ltd. ............................      15,600,000
  6,000,000   Los Angeles County Sales Tax Trust Receipts Revenue VRDN,
                3.25%, 7/1/05, INSUR: MBIA .....................................       6,000,000
  3,075,000   Mid-Peninsula Regulatory Open Space District VRDN, Series A,
                4.15%, 2/1/08, LOC: Fuji Bank, Ltd. ............................       3,075,000
    200,000   Oceanside MFH Revenue VRDN, 3.675%, 12/1/07,
                C/LOC: Western Federal S&L .....................................         200,000
              Orange County Apartment Development Revenue VRDN:
 12,750,000     3.40%, 11/1/05, LOC: First Interstate Bancorp ..................      12,750,000
 14,500,000     3.00%, 4/1/06, LOC: Bank of Tokyo-Mitsubishi, Ltd. .............      14,500,000
 23,250,000     3.65%, 3/1/07, LOC: Tokai Bank, Ltd. ...........................      23,250,000
  7,300,000     3.35%, 11/1/07, LOC: Bank of Tokyo-Mitsubishi, Ltd. ............       7,300,000  
  2,000,000     3.45%, 11/1/08, LOC: Banque Paribas ............................       2,000,000
 16,900,000     4.25%, 11/1/08, LOC: Tokai Bank, Ltd. ..........................      16,900,000  
 27,500,000     4.35%, 11/1/09, LOC: Tokai Bank, Ltd. ..........................      27,500,000
  9,200,000   Orange County Housing Authority Revenue VRDN, 3.40%, 12/1/07,
                LOC: Bank of Tokyo-Mitsubishi, Ltd. ............................       9,200,000
  5,000,000   Orange County Rental Housing Revenue VRDN, 3.60%, 5/1/22,
                LOC: Banque Paribas ............................................       5,000,000
  4,517,857   Palmdale School District Project Lease VRDN, 3.60%, 12/13/10,
                LOC: National Westminster Bank .................................       4,517,857
  4,250,000   Paramount MFH Revenue VRDN, 4.19%, 10/1/18,
                LOC: Heller Financial ..........................................       4,250,000
              Riverside MFH Revenue VRDN:
  3,200,000     4.50%, 6/1/05, LOC: Tokai Bank, Ltd. ...........................       3,200,000
  1,065,000     4.25%, 6/1/09, LOC: Tokai Bank, Ltd. ...........................       1,065,000
  5,395,000   Sacramento County MFH Revenue VRDN, 4.50%, 12/1/98,
                LOC: Tokai Bank, Ltd. ..........................................       5,395,000
  4,335,000   Sacramento Yolo District Improvement Lease Revenue VRDN, 5.50%,
                10/1/22, LOC: Tokai Bank, Ltd. .................................       4,335,000
              San Bernardino County MFH Revenue VRDN:
 28,000,000     5.58%, 5/1/15, IA: Escrowed/T-Bills ............................      28,000,000
  1,500,000     4.50%, 8/1/05, LOC: Tokai Bank, Ltd. ...........................       1,500,000
              San Bernardino County Public Safety Authority Revenue Bonds:
  7,000,000     3.90%, 11/1/96 .................................................       7,000,000
  6,000,000     4.10%, 5/1/97 ..................................................       6,000,000
</TABLE> 

8 - CALVERT TAX-FREE RESERVES                     SEMI-ANNUAL REPORT (UNAUDITED)
     
<PAGE>
<TABLE>
 <CAPTION>

PRINCIPAL
AMOUNT                                                                          VALUE
- ------------------------------------------------------------------------------------------
<S>          <C>                                                                <C>
CALIFORNIA (CONT'D)
$ 5,050,000  San Diego MFH Revenue VRDN, 3.50%, 8/1/15,
               LOC: Bank of Tokyo-Mitsubishi, Ltd.............................. $5,050,000
  2,300,000  San Diego Public Facilities Finance Revenue VRDN, 3.50%,5/15/20,
               INSUR: AMBAC....................................................  2,300,000
 16,860,000  San Francisco MFH Revenue VRDN, 4.05%,10/1/00,
               LOC: Mitsubishi T&B............................................. 16,860,000
  4,900,000  Santa Ana Housing Authority Revenue VRDN, 3.50%, 12/1/07,
               C/LOC: Mercury S&L..............................................  4,900,000
  1,000,000  Santa Ana IDA Revenue VRDN, 3.825%, 11/1/05,
               C/LOC: Mercury S&L..............................................  1,000,000
  4,000,000  Simi Valley MFH Revenue VRDN, 3.25%, 10/2/06,
               LOC: Sumitomo T&B...............................................  4,000,000
    700,000  Stockton IDA Revenue VRDN, 4.46%, 12/1/16,
               LOC: Union Bank of California...................................    700,000
  2,975,000  Union City Housing Mortgage Revenue VRDN, 4.05%, 10/1/11,
               LOC: Mitsubishi T&B.............................................  2,975,000
  1,200,000  Upland Apartment Development Revenue VRDN, 3.65%, 1/1/09,
               LOC: Tokai Bank, Ltd............................................  1,200,000
 16,600,000  Victor Valley Community College Revenue VRDN, 3.45%, 11/1/24,
               GA: Anchor National Life........................................ 16,600,000
  2,905,000  Victorville MFH Revenue VRDN, 3.9%, 12/1/15,
               C/LOC: Redland S&L..............................................  2,905,000

COLORADO - 0.7%
  2,500,000  Arapahoe County MFH Revenue VRDN, 4.10%, 11/1/17,
               LOC: Heller Financial...........................................  2,500,000
  3,500,000  City and County of Denver MFH Revenue VRDN, 3.55%, 12/15/14,
               LOC: Sumitomo T&B...............................................  3,500,000
  3,695,000  Denver City & County Airport Revenue VRDN, 3.50%, 11/15/25,
              INSUR: MBIA......................................................  3,695,000
  2,150,000  Lakewood IDA Revenue VRDN, 4.00%, 8/1/07,
               LOC: West One Bank..............................................  2,150,000

CONNECTICUT - 0.1%
  1,260,000  Connecticut State Health and Education Facilities Authority 
               Revenue VRDN, 3.60%, 2/1/09, LOC: Barclays Bank, Plc............  1,260,000
  1,201,000  Connecticut State Development Authority Revenue VRDN, 3.60%,
               6/1/08, LOC: Barclays Bank, Plc.................................  1,201,000

DISTRICT OF COLUMBIA - 1.9%
             D.C. General Obligation Unlimited VRDN:
 10,900,000    3.55%, 6/1/03, INSUR: AMBAC..................................... 10,900,000
  5,300,000    3.55%, 6/1/03, INSUR: FSA.......................................  5,300,000
  7,710,000    3.55%, 6/1/03, INSUR: MBIA......................................  7,710,000
 10,390,000  D.C. MFH Revenue VRDN, 3.65%, 12/1/05,
               LOC: Sumitomo Bank, Ltd......................................... 10,390,000
</TABLE>

SEMI-ANNUAL REPORT (UNAUDITED)                     CALVERT TAX-FREE RESERVES - 9
<PAGE>
<TABLE> 
<CAPTION> 
 
PRINCIPAL
AMOUNT                                                                                                  VALUE
- ---------------------------------------------------------------------------------------------------------------
<S>                                                                                                 <C> 
Florida  -  7.6%
 $ 3,800,000   Dade County Aviation Revenue VRDN, Series A, 3.85%, 10/1/09,
                 LOC: Fuji Bank, Ltd.............................................................   $ 3,800,000
               Florida Housing Finance Agency Revenue VRDN:
   8,800,000     3.45%, 7/1/23, LOC: Heller Financial............................................     8,800,000
  48,140,000     3.75%, 7/1/22, LOC: Sumitomo T&B................................................    48,140,000
   5,000,000   Gulf Breeze Revenue VRDN, Series A, 3.39%, 3/31/21,
                 LOC: Barnett Bank of South Florida..............................................     5,000,000
  10,600,000   Lee County IDA Revenue VRDN, 3.95%, 4/1/10,
                 LOC: Banque Paribas.............................................................    10,600,000
   6,025,000   Manatee County Housing Finance Authority Revenue VRDN,
                 3.85%, 12/1/07, LOC: Marine Midland Bank........................................     6,025,000
               Orange County Health Facilities Authority Revenue VRDN:
  21,400,000     3.75%, 7/15/96, INSUR: MBIA.....................................................    21,400,000
  11,400,000     3.65%, 7/17/96, INSUR: MBIA.....................................................    11,400,000
   6,880,000     3.45%, 10/1/06, INSUR: MBIA.....................................................     6,880,000
   4,000,000     3.45%, 10/1/08, INSUR: MBIA.....................................................     4,000,000
     150,000   Orange County MFH Revenue VRDN, 3.40%, 10/1/08,
                 LOC: NationsBank................................................................       150,000
   4,720,000   Palm Beach County IDA Revenue VRDN, 4.21%, 5/5/10,
                 LOC: Union Bank of California...................................................     4,720,000
   3,500,000   Volusia County MFH Revenue VRDN, 3.925%, 9/1/05,
                 GA: Household Finance Corp......................................................     3,500,000

Georgia  -  3.5%
   6,000,000   Albany Dougherty County Hospital Revenue VRDN, 3.40%, 9/1/04,
                 INSUR: AMBAC....................................................................     6,000,000
   2,000,000   Athens MFH Revenue VRDN, 3.675%, 8/1/05,
                 LOC: First Bank, N.A............................................................     2,000,000
  14,600,000   Atlanta Urban Residential MFH Revenue VRDN, 3.85%
                 12/1/08, LOC: Marine Midland Bank...............................................    14,600,000
   7,900,000   Columbus Downtown Development Authority Revenue VRDN, 3.50%,
                 8/1/15, LOC: Columbus B&T.......................................................     7,900,000
   7,470,000    DeKalb County MFH Revenue VRDN, 3.50%, 11/1/15,
                  LOC: Amsouth Bank..............................................................     7,470,000
                Jackson County IDA Revenue VRDN:
   7,000,000      3.75%, 12/1/15, LOC: Bank of Tokyo-Mitsubishi, Ltd.............................     7,000,000
   2,620,000      3.80%, 12/1/24, LOC: Barclays Bank, Plc........................................     2,620,000
   7,470,000    Paulding County IDA Revenue VRDN, 3.65%, 12/1/09,
                  LOC: National Bank of Detroit..................................................     7,470,000
   5,950,000    Peachtree City IDA Revenue VRDN, 4.20%, 10/1/08,
                  LOC: Union Bank of Finland.....................................................     5,950,000

Hawaii  -   0.8%
  14,400,000    Hawaii Department of Budget and Finance Special Purpose Mortgage
                  Revenue VRDN, 3.60%, 12/1/21, LOC:
                  Bank of Tokyo-Mitsubishi, Ltd..................................................    14,400,000
</TABLE> 
                 
10 - CALVERT TAX-FREE RESERVES                   SEMI-ANNUAL REPORT (UNAUDITED) 
<PAGE>

<TABLE>
<CAPTION>
  
Principal
Amount                                                                                       Value
- ------------------------------------------------------------------------------------------------------
Illinois - 6.6%
<S>              <C>                                                                     <C>
$12,850,000      Carol Stream MFH Revenue VRDN, 4.05%, 8/1/23,
                   LOC:  Heller Financial............................................    $12,850,000
 10,000,000      Chicago MFH Revenue VRDN, 3.45%, 11/1/10,
                   LOC:  Fleet National Bank.........................................     10,000,000
  3,300,000      Decatur Water Treatment Revenue VRDN, 3.65%, 8/16/96,
                   LOC:  Sumitomo Bank, Ltd. ........................................      3,300,000
 16,000,000      Galesburg Knox College Project Revenue VRDN, 3.40%, 3/1/31,
                   LOC:  LaSalle Bank................................................     16,000,000
                 Illinois Educational Facilities Authority Revenue VRDN:
 17,325,000        3.45%, 1/1/05, INSUR:  FGIC.......................................     17,325,000
 13,400,000        3.65%, 1/1/18, LOC:  Sumitomo Bank, Ltd. .........................     13,400,000
                 Illinois IDA Revenue VRDN:
  2,800,000        4.20%, 11/1/02, LOC:  American National B&T ......................      2,800,000
  2,000,000        3.95%, 1/1/09, LOC:  Industrial Bank of Japan.....................      2,000,000
  3,400,000        Series A, 3.70%, 1/1/10, LOC:  American National B&T..............      3,400,000
  2,225,000        Series B, 3.70%, 1/1/10, LOC:  American National B&T..............      2,225,000
  3,000,000        4.20%, 9/2/05, LOC:  American National B&T........................      3,000,000
 10,000,000        3.30%, 6/1/31, LOC:  Bank of America..............................     10,000,000
                 Illinois Health Facilities Authority Revenue VRDN:
  7,765,000        3.80%, 7/1/12, LOC:  First S&L....................................      7,765,000
  6,000,000        3.40%, 8/1/15, LOC:  First National Bank of Chicago...............      6,000,000
  4,745,000      Illinois Housing Development Authority Revenue VRDN, 3.85%,
                   2/1/24, LOC:  Sumitomo Bank, Ltd. ................................      4,745,000
  2,280,000      Winnebago County IDA Revenue VRDN, 5.8575%, 12/1/06,
                   LOC:  Bank of Nova Scotia.........................................      2,280,000

Indiana - 1.0%
  8,420,000      Lawrence Economic Development Revenue VRDN, 3.95%, 6/1/24,
                   LOC:  Heller Financial............................................      8,420,000
  4,500,000      South Bend MFH Revenue VRDN, 3.80%, 10/1/09,
                   LOC:  Society Bank of Cleveland...................................      4,500,000
  5,200,000      South Bend Redevelopment Authority Lease Revenue VRDN,
                   5.85%, 2/1/19, LOC:  Fuji Bank, Ltd. .............................      5,200,000

Iowa - 0.1%
  1,600,000      Davenport IDA Revenue VRDN, 5.858%, 12/1/06,
                   LOC:  Bank of Nova Scotia.........................................      1,600,000

Kansas - 1.0%
  6,600,000      Kansas City MFH Revenue VRDN, 3.65%, 6/1/15,
                   LOC:  Huntington National Bank....................................      6,600,000

 11,075,000      Shawnee MFH Revenue VRDN, 3.90%, 2/1/24,
                   LOC:  Heller Financial ...........................................     11,075,000

Kentucky - 1.9%
  3,250,000      Boone County Industry Building Revenue VRDN, 3.85%, 9/1/02,
                   LOC:  Fifth Third Bank............................................      3,250,000
  4,000,000      Bowling Green IDA Revenue VRDN, 4.55%, 12/1/96,
                   LOC:  Long Term Credit Bank of Japan..............................      4,000,000

</TABLE> 

SEMI-ANNUAL REPORT (UNAUDITED)       CALVERT TAX-FREE RESERVES - 11

<PAGE>
 
<TABLE>
<CAPTION>
 
Principal
Amount                                                                 Value
- --------------------------------------------------------------------------------
<S>                                                                 <C>      
KENTUCKY (CONT'D)
 $3,500,000 Glasgow IDA Revenue VRDN, 5.775%, 6/1/20,
             LOC: Bank of Tokyo-Mitsubishi, Ltd...................  $ 3,500,000 
            Jefferson County IDA Revenue VRDN:
    500,000  3.70%, 6/1/99, LOC: PNC Bank, KY.....................      500,000
  2,200,000  3.70%, 12/1/06, LOC: PNC Bank, KY....................    2,200,000
  3,280,000  3.70%, 7/1/19, LOC: PNC Bank, KY.....................    3,280,000
  2,300,000 Kentucky Rural Economic Development Authority Revenue 
             VRDN, 3.70%, 10/1/16, LOC: PNC Bank, KY..............    2,300,000
  3,000,000 Ohio County Pollution Control Revenue VRDN, 3.75%,
             10/1/15, LOC: Chemical Bank..........................    3,000,000
  9,500,000 Richmond IDA Revenue VRDN, 3.70%, 4/1/20,
             LOC: Seattle First National..........................    9,500,000
  1,500,000 Scott County IDA Revenue VRDN, 3.70%, 9/1/05,
             LOC: PNC Bank, KY....................................    1,500,000
  1,500,000 Walton IDA Revenue VRDN, 4.55%, 11/1/96,
             LOC: Asahi Bank, Ltd.................................    1,500,000
 
MAINE - 0.4%
  7,300,000 Orrington Resource Recovery Revenue VRDN, 4.175%, 5/1/03,
             LOC: Bank of Nova Scotia.............................    7,300,000
 
MARYLAND - 1.4%
  2,870,000 Anne Arundel County IDA Revenue VRDN, 4.19%, 5/1/02,
             LOC: First National Bank of Maryland.................    2,870,000
  2,562,330 Baltimore County Economic Development Authority Revenue 
             VRDN, 5.15%, 9/1/96, LOC: First National Bank
             of Maryland..........................................    2,562,330
            Maryland Economic Development Corporation Revenue VRDN:
  1,200,000  5.15%, 11/1/02, LOC: First National Bank of Maryland..   1,200,000
  1,000,000  3.35%, 6/1/20, LOC: NationsBank.......................   1,000,000
 13,790,000 Maryland Health and Education Facilities Authority
             Revenue VRDN, 3.55%, 7/1/14, LOC: First National Bank
             of Maryland..........................................   13,790,000
  4,296,176 Ocean City IDA Revenue VRDN, 5.3625%, 7/1/13,
             LOC: First National Bank of Maryland.................    4,296,176
 
MASSACHUSETTS - 1.2%
  1,250,000 Hudson IDA Revenue VRDN, 4.46%, 10/1/13,
             LOC: FNB Boston......................................    1,250,000
            Massachusetts Bay Transportation Authority Revenue VRDN:
  7,000,000  3.65%, 7/18/96, LOC: Westdeutsche Landesbank.........    7,000,000
  5,000,000  3.40%, 7/29/96, LOC: Westdeutsche Landesbank.........    5,000,000
            Massachusetts State Industrial Finance Authority
             Revenue VRDN:
  1,650,000  4.21%, 11/3/99, LOC: FNB Boston......................    1,650,000
  5,200,000  4.46%, 8/1/14, LOC: FNB Boston.......................    5,200,000
  1,000,000 New Bedford IDA Revenue VRDN, 4.46%, 10/1/97, LOC:
             Corestates...........................................    1,000,000
 
MICHIGAN - 1.6%
            Michigan Housing Development Authority Limited
             Obligation Revenue VRDN:
  2,675,000  4.29%, 11/1/14, LOC: Citibank........................    2,675,000
  4,400,000  4.29%, 5/1/16, LOC: Citibank.........................    4,400,000
</TABLE>

12 - CALVERT TAX-FREE RESERVES                    SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>

<TABLE>
<CAPTION>

PRINCIPAL
AMOUNT                                                                                                                      VALUE
- -----------------------------------------------------------------------------------------------------------------------------------
MICHIGAN (CONT'D)
<S>             <C>                                                                                                      <C>
  $10,000,000    Michigan State General Obligation Unlimited Notes, 4.00%, 9/30/96....................................   $10,009,100
    4,000,000    Michigan State Strategic Limited Obligation Revenue VRDN, 3.60%,
                   7/1/99, LOC: Bank of Tokyo-Mitsubishi, Ltd.........................................................     4,000,000
    8,000,000    Sault Sainte Marie Tribe Building Revenue VRDN, Series A, 4.46%,
                   6/1/03, LOC: First of America Bank.................................................................     8,000,000

MINNESOTA - 1.2%
    1,100,000    Cottage Grove Pollution Control Board Revenue VRDN, 3.75%,
                   8/1/12, GA: Minnesota Mining and Manufacturing.....................................................     1,100,000
   19,660,000    Minneapolis MFH Revenue VRDN, 3.35%, 12/1/14,
                   LOC: Citibank......................................................................................    19,660,000

MISSISSIPPI - 0.7%
    2,500,000    Flowood IDA Revenue VRDN, 3.80%, 11/1/01,
                   LOC: PNC Bank, KY..................................................................................     2,500,000
                 Mississippi Business Finance Corporation Revenue VRDN:
    2,700,000    3.90%, 6/1/05, LOC: Marine Midland Bank..............................................................     2,700,000
    3,675,000    3.85%, 1/1/06, LOC: National Bank of Canada..........................................................     3,675,000
    3,500,000    Panola County Moog Automotive Inc. Project Revenue VRDN, 3.65%,
                   9/1/10, LOC: Instituto Bancario....................................................................    3,500,000
MISSOURI - 0.8%
    4,045,000    Kansas City MFH Revenue VRDN, 3.70%, 8/1/20,
                   LOC: Heller Financial..............................................................................    4,045,000
    1,155,000    Missouri IDA Revenue VRDN, 4.46%, 3/1/01,
                   LOC: FNB Boston....................................................................................    1,155,000
    9,300,000    St. Louis IDA Revenue VRDN, 4.35%, 1/1/21,
                   LOC: Banca Nazionale Del Lavoro....................................................................    9,300,000

NEBRASKA - 0.2%
    4,365,000    Nebraska Investment Finance Authority MFH Revenue VRDN, 3.65%,
                   10/1/10, LOC: LaSalle Bank.........................................................................    4,365,000

NEW HAMPSHIRE - 1.5%
     5,945,000   New Hampshire Higher Education & Health Adjustable Trust Receipts,
                   Series SG19, 3.45%, 6/1/23, BPA: Societe Generale..................................................    5,945,000
    14,075,000   Manchester MFH Revenue VRDN, 6.25%, 6/15/15,
                   LOC: Daiwa Bank, Ltd...............................................................................   14,075,000
     6,500,000   New Hampshire IDA Revenue VRDN, 3.75%, 6/1/14,
                   LOC: Commerz Bank, A.G.............................................................................    6,500,000

NEW JERSEY - 1.7%
                 New Jersey Economic Development Authority Revenue VRDN:
    2,350,000    3.70%, 3/1/98, LOC: Meridian Bank....................................................................    2,350,000
    1,240,000    3.70%, 1/1/00, LOC: Marine Midland Bank..............................................................    1,240,000
    1,500,000    4.625%, 12/1/14, LOC: Citibank.......................................................................    1,500,000
    1,360,000    3.70%, 12/1/15, LOC: Meridian Bank...................................................................    1,360,000
    7,400,000    4.30%, 12/1/15, LOC: Asahi Bank, Ltd.................................................................    7,400,000
    2,450,000    3.70%, 8/1/17, LOC: Midlantic National Bank..........................................................    2,450,000
</TABLE>


SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 13
<PAGE>

<TABLE>
<CAPTION>

PRINCIPAL
AMOUNT                                                                                                                         VALUE
- ------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                                                                                                      <C>
NEW JERSEY (CONT'D)
                 New Jersey Housing & Mortgage Finance Agency Revenue VRDN:
    $310,000       3.50%, 4/1/12, INSUR: MBIA.........................................................................   $   310,000
  12,770,000       3.55%, 4/1/12, INSUR: MBIA.........................................................................    12,770,000
     500,000       3.50%, 10/1/15, INSUR: MBIA........................................................................       500,000

NEW MEXICO - 0.2%
   4,000,000     New Mexico Educational Assistance Student Loan Revenue VRDN,
                   3.60%, 4/1/05, INSUR: AMBAC........................................................................     4,000,000

NEW YORK - 4.2%
  10,000,000     New York City General Obligation Bonds, 3.50%, 9/13/96,
                   LOC: Morgan Guarenty Trust.........................................................................    10,000,000
                 New York City IDA Revenue VRDN:
  18,500,000       3.70%, 1/1/29, LOC Bank of America.................................................................    18,500,000
  38,300,000       3.70%, 7/1/29, LOC: Bank of America................................................................    38,300,000
   7,700,000     Orange County IDA Revenue VRDN, 3.95%, 6/1/98,
                   LOC: Sakura Bank...................................................................................     7,700,000

NEVADA - 0.1%
   1,900,000     Henderson Public Improvement Trust Revenue VRDN, 3.80%, 4/1/07,
                   LOC: Barclays Bank, Plc............................................................................     1,900,000

OKLAHOMA - 0.9%
   5,930,000     Cleveland MFH Revenue VRDN, 3.60%, 4/1/20,
                   SURBD: Continental Casualty Co.....................................................................     5,930,000
   5,900,000     Oklahoma Housing Finance Authority Revenue VRDN, 4.05%, 12/1/05,
                   C/LOC: Binghampton Savings Bank....................................................................     5,900,000
   5,000,000     Tulsa IDA Revenue VRDN, Series A, 4.20%, 11/1/14,
                   LOC: Sanwa Bank, Ltd...............................................................................     5,000,000

PENNSYLVANIA - 8.3%
                 Berks County IDA Revenue VRDN:
   2,000,000       3.90%, 9/1/10, LOC: Meridian Bank..................................................................     2,000,000
   2,600,000       3.70%, 7/1/25, LOC: Meridian Bank..................................................................     2,600,000
                 Emmaus General Obligation Revenue VRDN:
   7,300,000       3.40%, 3/1/24, LOC: Fuji Bank, Ltd.................................................................     7,300,000
   3,000,000       3.40%, 3/1/24, LOC: Marine Midland Bank............................................................     3,000,000
  50,000,000     Harrisburg Mortgage Pool Financing Fund Authority Revenue VRDN,
                   3.60%, 7/1/21, GA: Anchor National Life............................................................    50,000,000
   8,250,000     Montgomery County IDA Revenue VRDN, 3.55%, 12/1/13,
                   LOC: PNC Bank, N.A.................................................................................     8,250,000
                 Philadelphia General Obligation Commercial Paper, Adjustable Coupon:
   3,000,000       3.75%, 7/11/96, LOC: Fuji Bank, Ltd................................................................     3,000,000
  12,600,000       3.80%, 7/11/96, LOC: Fuji Bank, Ltd................................................................    12,600,000
   7,900,000       3.70%, 7/17/96, LOC: Fuji Bank, Ltd................................................................     7,900,000
   6,100,000       3.80%, 7/18/96, LOC: Fuji Bank, Ltd................................................................     6,100,000
   9,100,000       3.70%, 7/22/96, LOC: Fuji Bank, Ltd................................................................     9,100,000
  10,000,000       3.80%, 7/23/96, LOC: Fuji Bank, Ltd................................................................    10,000,000
</TABLE>


14 - CALVERT TAX-FREE RESERVES                   SEMI-ANNUAL REPORT  (UNAUDITED)
<PAGE>
 
<TABLE>
<CAPTION>
 
Principal
Amount                                                                  Value
- --------------------------------------------------------------------------------
<S>                                                                 <C>
PENNSYLVANIA (CONT'D)
 $ 2,900,000 Philadelphia MFH Redevelopment Authority Revenue
              VRDN, 4.00%, 12/1/09, LOC: Marine Midland Bank........ $ 2,900,000
   1,460,000 Washington County IDA Revenue VRDN, 3.70%, 12/1/16,
              LOC: PNC Bank, N.A....................................   1,460,000
  11,500,000 Westmoreland County IDA Revenue VRDN, 4.375%, 5/1/18,
              LOC: Fleet National Bank..............................  11,500,000
   8,500,000 York County Hospital Authority Revenue VRDN, 3.94%,
              1/1/15, LOC: First National Bank of Maryland..........   8,500,000
 
SOUTH CAROLINA - 0.9%
   5,100,000 Dorchester IDA Revenue VRDN, 4.08%, 10/1/24,
              LOC: Bayerische Vereinsbank...........................   5,100,000
   4,860,000 Orangeburg IDA Revenue VRDN, 4.46%, 6/1/08,
              LOC: FNB Boston.......................................   4,860,000
   6,000,000 South Carolina State Housing Finance and Development
              Authority Revenue VRDN, 3.40%, 7/1/07, SURBD:
              Continental Casualty Co. .............................   6,000,000
 
SOUTH DAKOTA - 0.6%
   1,000,000 South Dakota Housing Development Authority Puttable
              Floating Rate Notes, 3.60%, 5/1/13, TOA:
              Banco Santander.......................................   1,000,000
 
TENNESSEE - 1.7%
   6,300,000 Coffee County IDA Revenue VRDN, 4.55%, 12/1/01,
              LOC: Asahi Bank, Ltd..................................   6,300,000
   1,700,000 Jackson IDA Revenue VRDN, 3.70%, 1/1/07,
              LOC: First Bank NA....................................   1,700,000
   2,850,000 McMinn County IDA Revenue VRDN, 3.65%, 10/2/04,
              LOC: Southtrust Bank, AL..............................   2,850,000
   2,160,000 Smith County IDA Revenue VRDN, 4.44%, 1/1/10,
              LOC: First National Bank of Maryland..................   2,160,000
   6,040,000 Tennessee Housing Development Agency Revenue VRDN, 
              4.35%, 7/1/13, INSUR: FSA.............................   6,040,000
  10,900,000 Volunteer State Student Funding Corporation Revenue 
              VRDN, 3.60%, 12/1/23, LOC: Sumitomo Bank, Ltd.........  10,900,000
 
TEXAS - 8.3%
   2,525,000 Cleburne IDA Revenue VRDN, 3.80%, 2/1/04,
              LOC: National City Bank...............................   2,525,000
   1,000,000 Grand Prairie IDA Revenue VRDN, 4.00%, 12/1/06,
              LOC: PNC Bank, N.A....................................   1,000,000
   2,240,000 Grand Prairie IDA Revenue VRDN, 3.65%, 5/1/14,
              LOC: Texas Commerce...................................   2,240,000
   3,150,000 Guadalupe Blanco River Authority Revenue VRDN, 3.80%, 
              3/1/08, LOC: Banque National De Paris.................   3,150,000
  76,150,000 Harris County Health Facilities Development Authority
              Revenue VRDN, 3.55%, 12/1/25, IA: Prudential
              Insurance Co..........................................  76,150,000
   3,200,000 Harris County IDA Revenue VRDN, 4.35%, 8/1/01,
              LOC: Sakura Bank, Ltd.................................   3,200,000
  58,450,000 Texas Tax and Revenue Anticipation Notes, Series A,
              4.75%, 8/30/96........................................  58,542,299
 
</TABLE>
SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 15
<PAGE>
 
<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT                                                                     VALUE
================================================================================            
<S>                                                                    <C>
UTAH - 0.3%
 $4,600,000  Provo City MFH Revenue VRDN, 3.55%, 12/15/10,
                LOC: Dai-Ichi Kangyo Bank..........................  $ 4,600,000
 
VERMONT - 0.0%
    515,000  Vermont State IDA Revenue VRDN, 4.21%, 12/1/04,
                LOC: FNB Boston....................................      515,000
 
VIRGINIA - 0.8%
  4,500,000  Loudoun County IDA Revenue VRDN, 4.15%, 11/1/24,
                LOC: Banque Paribas................................    4,500,000
 10,000,000  Richmond IDA Revenue VRDN, 4.25%, 12/1/17,
                LOC: Banque Paribas................................   10,000,000
 
WASHINGTON - 2.1%
  6,200,000  King County Trust Receipts, Series SGA 19, 3.50%, 
                11/1/27, INSUR: MBIA...............................    6,200,000
                
  6,785,000  Pierce County Economic Development Authority Revenue 
                VRDN, 3.85%, 6/1/30, 
                LOC: Bank of Tokyo-Mitsubishi, Ltd.................    6,785,000                
  2,950,000  Port Everett Limited VRDN, 3.75%, 12/1/06,
                LOC: Sumitomo Bank, Ltd............................    2,950,000
  3,000,000  Port Moses Lake Public Finance Corporation Revenue VRDN, 
                3.80%, 7/1/02, LOC: Sakura Bank, Ltd...............    3,000,000
                
  3,000,000  Richmond Golf Enterprise Revenue VRDN, 3.45%, 12/1/21,
                LOC: Seattle First National Bank...................    3,000,000
 11,000,000  Student Loan Finance Association Revenue VRDN, 3.55%, 
                12/1/02, LOC: Sanwa Bank, Ltd......................   11,000,000                
  4,000,000  Yakima County Public Corporation Revenue VRDN, 3.70%, 
                2/1/12, LOC: Seattle First National Bank...........    4,000,000
                 
WISCONSIN - 2.3%
    700,000  Deerfield IDA Revenue VRDN, 3.70%, 5/1/03,
                LOC: Commerz Bank, A.G.............................      700,000
  4,000,000  Oak Creek IDA Revenue VRDN, 3.75%, 7/1/04,
                LOC: Firstar Bank, Milwaukee.......................    4,000,000
  4,300,000  Sheboygan Falls IDA Revenue VRDN, 3.75%, 10/2/06,
                LOC: Firstar Bank, Milwaukee.......................    4,300,000
  7,000,000  Sun Prairie IDA Revenue VRDN, 3.75%, 5/1/15,
                LOC: Firstar Bank, Milwaukee.......................    7,000,000
 17,530,000  Wisconsin Housing and Economic Development Authority 
                Revenue VRDN, 4.00%, 3/1/20, INSUR: FSA............   17,530,000                
  6,800,000  Wisconsin State Health & Education Facilities Authority
                Revenue Bonds, 3.65%, 8/16/96, 
                LOC: Sumitomo Bank, Ltd............................    6,800,000
 
OTHERS - 4.5%
            Koch Financial Corp. Tender Option VRDN:
  9,310,000  3.75%, 10/20/00, TOA: Credit Suisse ..................    9,310,000
 16,465,000  3.85%, 10/20/00, TOA: Credit Suisse...................   16,465,000
  9,340,000  4.00%, 10/20/00, TOA: Credit Suisse...................    9,340,000
 13,570,677  LaSalle National Bank LeaseTOPS Trust, Series 1995A, 
                3.70%, 5/1/02, BPA: LaSalle Bank...................   13,570,677
</TABLE>

16 - CALVERT TAX-FREE RESERVES                   SEMI-ANNUAL REPORT  (UNAUDITED)

                                                 
<PAGE>
 
<TABLE>
<CAPTION>
 
PRINCIPAL
AMOUNT                                                                  VALUE
================================================================================
<S>                                                                     <C>
OTHERS (CONT'D)
$14,485,000  Pitney Bowes Credit Corporation Variable 
                Rate LeaseTOPS 3.70%, 4/1/98, 
                BPA: Pitney Bowes Credit........................ $   14,485,000    
             Puttable Floating Option Tax-Exempt Receipts:
  4,760,000     Series PP2, 3.75%, 7/1/24, TOA: Merrill Lynch...      4,760,000
  3,075,000     Series PP5, 3.85%, 8/15/24, INSUR: AMBAC........      3,075,000
  7,795,000     Series PPT4, 4.00%, 10/11/30, INSUR: AMBAC......      7,795,000

             TOTAL INVESTMENTS (Cost $1,732,485,439) - 98.4%....  1,732,485,439        
             Other assets and liabilities, net - 1.6%...........     27,574,892
                                                                 --------------  
             NET ASSETS - 100%.................................. $1,760,060,331
                                                                 ============== 
                                              
NET ASSETS CONSIST OF:
================================================================================
Paid in capital applicable to the following shares of beneficial 
  interest, unlimited number of no par shares authorized:  
     Class O: 1,722,931,335 shares outstanding.................. $1,722,817,407
     Class MMP: 37,160,694 shares outstanding...................     37,157,839
Undistributed net investment income (loss)......................        209,659
Accumulated realized gain (loss) on investments.................       (124,574)
                                                                 --------------   
  Net assets.................................................... $1,760,060,331
                                                                 ==============
                                              
NET ASSET VALUE PER SHARE:
================================================================================
Class O (based on net assets of $1,722,892,163)................. $         1.00
                                                                 ==============    
Class MMP (based on net assets of $37,168,168).................. $         1.00 
                                                                 ============== 
</TABLE>

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 17
<PAGE>

                                                      LIMITED-TERM PORTFOLIO
                                                      STATEMENT OF NET ASSETS
                                                           JUNE 30, 1996
<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT                                                                                                                     VALUE    
- ------------------------------------------------------------------------------------------------------------------------------------
                                                   MUNICIPAL OBLIGATIONS - 98.9%
ALABAMA - 1.6%
<S>              <C>                                                                                                      <C>
   $3,500,000    Athens Industrial Development Board Revenue VRDN, 4.05%,
                   6/1/05, LOC: Tokai Bank, Ltd.........................................................................  $3,500,000
    4,500,000    Auburn Industrial Development Board Revenue VRDN, 6.35%,
                   12/1/16, LOC: Daiwa Bank, Ltd........................................................................   4,500,000

ARIZONA - 2.6%
                 State Certificate of Participation Revenue Bonds, Series A:
    5,005,000      4.90%, 11/1/96, INSUR: AMBAC.........................................................................   5,022,267
    2,900,000      5.20%, 5/1/97, INSUR: AMBAC..........................................................................   2,928,855
    2,750,000    Glendale County Industrial Development Authority Revenue Bonds,
                   5.20%, 12/1/13, LOC: Dresdner Bank (Tender  12/1/98 @ 100)...........................................   2,780,387
   2,250,000     Maricopa County Pollution Control Revenue Bonds for El Paso Electric,
                   5.125%, 6/1/97, LOC: Citibank........................................................................   2,272,028

ARKANSAS - 0.2%
     840,000     Student Loan Authority Revenue Bond, 6.40%, 6/1/97.....................................................     857,842

 CALIFORNIA - 17.3%
     615,000     Chula Vista MFH, Eucalyptus Grove Project Revenue Bonds,
                   5.75%, 11/1/07, SURBD: Continental Casualty Co.......................................................     618,530
   7,500,000     Clovis MFH Revenue VRDN, 4.35%, 10/1/10, LOC: Tokai Bank, Ltd..........................................   7,500,000
   1,525,000     Compton Community Redevelopment Agency Tax Allocation Notes
                   Series 1, 5.50%, 8/1/98..............................................................................   1,552,618
   2,220,000     Health Facilities Financing, Downey Community Hospital Revenue Bonds,
                   4.75%, 5/15/99.......................................................................................   2,201,641
   1,750,000     Oakland Unified School District Alameda County 1994 Certificate of
                   Participation Revenue Bonds, 4.40%, 9/15/96..........................................................   1,748,303
     280,913     Palmdale School District Jupiter Land II Project Revenue VRDN,
                   3.60%, 12/13/10, LOC: National Westminster Bank......................................................     280,913
     960,000     Riverside MFH Revenue VRDN, 3.50%, 12/1/16,
                   LOC: Tokai Bank, Ltd.................................................................................     960,000
   2,500,000     San Bernardino County MFH Revenue VRDN, 4.50%, 8/1/01,
                   LOC: Tokai Bank, Ltd.................................................................................   2,500,000
                 San Bernardino Public Safety Authority, Insurance Financing Project
                   Revenue Bonds, Series A:
   8,000,000       4.50%, 5/1/98........................................................................................   8,027,600
   8,400,000       4.50%, 11/1/98.......................................................................................   8,427,300
   2,800,000       4.60%, 5/1/99........................................................................................   2,798,516
  11,005,000     San Diego MFH, La Cima Apartments Revenue VRDN, 6.00%, 12/1/08,
                   LOC: Daiwa Bank, Ltd.................................................................................  11,005,000
                 San Francisco City and County Redevelopment Agency MFH
                   Revenue VRDN:
  20,800,000       5.699%, 3/1/18, LOC: Dai-Ichi Kangyo Bank............................................................  20,800,000
  18,000,000       4.05%, 10/1/00, LOC: Mitsubishi T&B..................................................................  18,000,000
</TABLE>



18 - CALVERT TAX-FREE RESERVES                   SEMI-ANNUAL REPORT  (UNAUDITED)
<PAGE>
 
<TABLE>
<CAPTION> 
PRINCIPAL
AMOUNT                                                                  VALUE
===============================================================================
<S>                                                                     <C>
CALIFORNIA (CONT'D)
   $575,000  San Jose Financing Authority, Convention 
                Center Project Revenue Bonds, Series C, 
                5.75%, 9/1/98.......................................    $591,853
    465,000  Tahoe City Public Utility District, Capital 
                Facilities Project Certificates of 
                Participation, Series B, 5.60%, 6/1/98..............     472,342
                

COLORADO - 2.6%
             Denver City and County Airport Revenue Bonds, Series A:
  3,600,000  6.35%, 11/15/96........................................   3,633,624
  9,500,000  6.60%, 11/15/97........................................   9,803,430


DISTRICT OF COLUMBIA - 0.9%
  3,770,000  District of Columbia Hospital Revenue Bonds, 
                5.625%, 8/15/96.....................................   3,773,883
             District of Columbia Redevelopment Agency, 
                Sports Arena Revenue Bonds:
    500,000     4.85%, 11/1/97......................................     500,225
    500,000     4.85%, 11/1/98......................................     500,295
 

FLORIDA - 4.9%
  2,000,000  Dade County General Obligation Bonds,  12.00%, 10/1/96,
                INSUR: FGIC.........................................   2,042,000
  6,750,000  Duval County MFH Revenue VRDN, 4.70%, 6/1/07,
                LOC:  Household Finance Corp........................   6,750,000
 10,000,000  Jacksonville Hospital Revenue Bonds, 10.375%, 10/1/07
                (Pre-Refunded 10/1/97 @ 100)........................  10,989,700
  4,960,000  Palm Beach Housing Finance Authority-Mallards Cove 
                Revenue VRDN, 5.3625%, 3/1/22,
                INSUR:  Fireman's Insurance Co......................   4,960,000
 

ILLINOIS - 3.7%
  7,825,000  Bloomingdale IDA Revenue Bonds, 5.25%, 1/1/98, INSUR:
                Fireman's Insurance Co. (Tender 8/1/96 @ 100).......   7,830,086
  8,000,000  Chicago Board of Education Certificates of 
                Participation, 4.35%, 12/1/98, 
                LOC: Canadian Imperial..............................   7,961,200                
  2,000,000  Chicago Parking District General Obligation 
                Refunding Bonds, 5.50%, 1/1/99, INSUR: FGIC.........   2,045,020                
    970,000  Illinois Housing Development Authority MFH Revenue 
                Bonds, Series A, 5.30%, 7/1/96......................     970,116
                 

INDIANA - 1.7%
  8,600,000  Madison Economic Development Arvin Sango Incorporated 
                Project Revenue VRDN, 4.30%, 8/1/17, 
                LOC: Tokai Bank, Ltd................................   8,600,000
                 

KENTUCKY - 1.6%
  4,000,000  Bowling Green IDA Revenue VRDN, 4.55%, 12/1/96,
                LOC:  Long Term Credit Bank of Japan................   4,000,000
  2,500,000  Glasgow IDA Revenue VRDN, 5.775%, 6/1/20,
                LOC: Bank of Tokyo-Mitsubishi, Ltd..................   2,500,000
  1,800,000  State Turnpike Authority Economic Development 
                Revenue Bonds, 5.00%, 1/1/98........................   1,819,782
             
 
</TABLE>

SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 19
<PAGE>
 
<TABLE>
<CAPTION>
 

 
Principal
Amount                                                               Value
- --------------------------------------------------------------------------------
<S>                                                                 <C>   
LOUISIANA - 4.1%
           Public Facilities Authority Revenue Bonds:
$5,000,000  6.00%, 7/1/07, GA: Connecticut General Life Insurance Co.
             (Tender 7/1/97 @ 100).................................. $ 5,008,250
 4,000,000  7.30%, 12/1/15, (Tender 6/1/97 @ 100),
             LOC: Sumitomo Bank, Ltd................................   4,121,840
           Offshore Deepwater Port Revenue Bonds:
 1,000,000  6.25%, 9/1/96...........................................   1,004,280
 5,000,000  5.20%, 9/1/97...........................................   5,049,550
 2,535,000  6.35%, 9/1/97...........................................   2,603,217
 2,780,000  6.45%, 9/1/98...........................................   2,895,009

 
MAINE - 1.4%
 6,875,000 Finance Authority of Maine MFH Revenue Bonds, 4.50%, 
            9/1/18, LOC:  Sakura Bank (Tender 9/1/96 @ 100).........   6,876,237
 
MARYLAND - 2.1%
    56,831 Baltimore County Economic Development Corp., 
            John Schmitz & Sons Revenue Bonds, 5.00%, 12/1/08,
            LOC: First National Bank of Maryland
             (Tender 12/1/98 @ 100).................................      55,272
 1,916,820 Harford IDA Board Revenue VRDN, 5.25%, 6/1/10,
            LOC: First National Bank of Maryland....................   1,916,820
           State IDA Economic Development Corp. Revenue Bonds:
   340,000 Series B, 5.875%, 11/1/09, LOC: First National Bank of
            Maryland................................................     340,473
 3,560,000 5.50%, 12/31/11, LOC: First National Bank of Maryland....   3,553,272
 1,000,000 Montgomery County Economic Development Bonds, 6.375%,
            11/1/09, LOC: First National Bank of Maryland...........   1,000,980
 4,000,000 Montgomery County Housing Opportunities Commission MFH
            Revenue Bonds, 6.00%, 2/1/07, GA: New England Mutual Life
            (Tender 2/1/97 @ 100)...................................   4,006,400
 
MASSACHUSETTS - 1.5%
           Housing Finance Agency MFH Revenue Bonds, Series A:
    50,000  4.80%, 6/1/97, INSUR: AMBAC.............................      50,076
   485,000  4.80%, 12/1/97, INSUR: AMBAC............................     485,941
   495,000  5.00%, 6/1/98, INSUR: AMBAC.............................     496,426
   505,000  5.00%, 12/1/98, INSUR: AMBAC............................     505,949
   520,000  5.10%, 6/1/99, INSUR: AMBAC.............................     519,896
 5,240,000  Wholesale Electric Power Company Revenue Bonds, 6.10%,
             7/1/98.................................................   5,402,283

 
MICHIGAN - 4.1%
 2,000,000 Detroit Distributable State Aid Revenue Bonds, 5.625%,
            5/1/97..................................................   2,032,340
 5,030,000 Detroit Limited General Obligation Bonds, Series A,
            5.20%, 5/1/98...........................................   5,084,173
   325,000 State Housing Development Authority Regency Square
            Limited Obligation Revenue VRDN, 4.29%, 11/1/14,
            LOC: Citibank...........................................     325,000
   575,000 State Housing Development Authority River Place Plaza
            Limited Obligation Revenue Bonds, 5.25%, 10/1/11........     553,915
   290,000 State Housing Development Authority Revenue Bonds,
            6.00%, 10/1/11, (Escrowed in U.S. Treasury Obligations).     288,251
</TABLE>

20 - CALVERT TAX-FREE RESERVES                    SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
<TABLE>
<CAPTION>

PRINCIPAL
AMOUNT                                                                            VALUE
==========================================================================================
<S>                                                                             <C>
Michigan (Cont'd)
             Michigan State Hospital Finance Authority Pontiac Osteopathic
              Revenue Bonds, 4.90%:
 $1,000,000   2/1/98..........................................................  $  999,350
  1,000,000   2/1/99..........................................................     992,780
  3,525,000  Oakland County Economic Development Obligation, 5.25%, 11/1/14
              (Put 11/1/97 @ 100).............................................   3,590,142
  6,680,000  Southfield Economic Development Corporation Revenue VRDN,
              5.775%, 5/15/11, INSUR: Firemans Insurance Co...................   6,680,000

Minnesota - 1.3%
  6,550,000  Edina MFH Vernon Terrace Revenue Bonds, 5.00%, 7/1/25............   6,515,743

Missouri - 0.2%
  1,200,000  Missouri State Health and Education Facilities Bethesda Group
              Revenue Bonds, 5.25%, 8/15/96...................................   1,200,060

Nevada - 1.6%
  8,150,000  Sparks Redevelopment Agency Tax Allocation Bond Anticipation
              Notes, 5.00%, 9/1/97............................................   8,142,747

New Hampshire - 0.1%
    445,000  New Hampshire Higher Education & Health Revenue Bonds,
              7.50%, 12/1/00, INSUR: FGIC.....................................     454,843

New Jersey - 0.2%
    900,000  New Jersey Economic Development Authority Revenue VRDN, 3.70%,
              8/1/01, LOC: Corestates.........................................     900,000

New York - 13.9%
             City University Certificates of Participation:
  2,785,000   4.40%, 8/15/97..................................................   2,794,636
  4,970,000   4.65%, 8/15/98..................................................   4,981,729
             State Certificate of Participation Revenue Bonds:
  2,500,000   5.50%, 9/1/96...................................................   2,504,975
  3,000,000   5.75%, 3/1/97...................................................   3,036,600
  5,335,000   4.75%, 9/1/97...................................................   5,372,879
  5,775,000   4.90%, 3/1/98...................................................   5,813,346
  5,920,000   4.90%, 9/1/98...................................................   5,959,664
             New York City General Obligation Bonds:
  1,500,000   Series A, 7.20%, 8/15/96........................................   1,506,375
  1,940,000   Series D, 6.80%, 2/1/97.........................................   1,972,708
  1,000,000   Series E, 5.50%, 8/1/97.........................................   1,014,970
  2,035,000   Series K, 5.00%, 4/1/99.........................................   2,038,989
  6,500,000  New York City Housing Development East 96th St. Project Special
              Obligation VRDN, 3.30%, 8/1/15..................................   6,500,000
  6,500,000  New York City IDA Revenue VRDN, 3.70%, 7/1/29,
              LOC: Bank of America............................................   6,500,000
             New York Dormitory Authority Revenue Bonds:
  7,385,000   Series A, 4.375%, 7/1/97........................................   7,412,251
  1,165,000   Series A, 4.75%, 7/1/97.........................................   1,173,574
  1,155,000   Series B, 4.375%, 7/1/97........................................   1,159,262


</TABLE>
SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 21

<PAGE>
 
<TABLE>
<CAPTION>
 
Principal
Amount                                                                                                          Value
- ---------------------------------------------------------------------------------------------------------------------
New York (Cont'd)
<S>              <C>                                                                                      <C> 
                 New York Energy Research and Development Authority State Service
                   Contract Revenue Bonds:
  $575,000         5.00%, 4/1/97..................................................................        $   579,514
   595,000         5.00%, 4/1/98..................................................................            599,236
 2,800,000       New York State Thruway Authority Highway and Bridge Trust Fund
                   Revenue Bonds, Series A, 4.10%, 4/1/97.........................................          2,805,432
 1,100,000       Orange County IDA Revenue VRDN, 5.445%, 12/1/05,
                   LOC: United Jersey Bank........................................................          1,100,000
 5,400,000       Port Authority New York and New Jersey, 1st Installment KIAC
                   Project Special Obligation Revenue Bonds, 6.25%, 10/1/99.......................          5,455,944

Ohio - 1.4%
 1,060,000       Cleveland Motor Vechicle Motorized Equipment Certificates of
                   Participation, 6.50%, 1/1/98...................................................          1,088,397
 2,450,000       Cleveland School District General Obligation Bonds, 7.25%, 6/15/98...............          2,549,886
 3,275,000       Lucas IDA Revenue VRDN, 5.3625%, 9/1/14, LOC: Bank of Tokyo-
                   Mitsubishi, Ltd................................................................          3,275,000
 
Pennsylvania - 6.2%
 8,500,000       Beaver County IDA Pollution Control Revenue Bonds, 4.30%,
                   10/1/32, LOC: Barclay's Bank, Plc. (Tender 10/1/97 @ 100)......................          8,538,845
 7,000,000       Pennsylvania Intergovernmental Cooperative Authority Special Tax
                   Revenue Notes, 5.40%, 6/15/97..................................................          7,111,580
 2,000,000       Philadelphia Gas Works Revenue Bonds Series B, 6.90%, 7/1/96.....................          2,000,480
                 Philadelphia Hospitals & Higher Education Revenue Bonds:
 1,200,000          5.05%, 7/1/98.................................................................          1,200,444
 1,335,000          5.35%, 7/1/99.................................................................          1,341,608
                 Philadelphia Municipal Authority, Philadelphia Gas Works Equipment
                    Certificates of Participation, INSUR: Asset Guaranty:
 1,500,000          5.95%, 4/1/97.................................................................          1,522,410
 1,500,000          5.95%, 10/1/97................................................................          1,531,920
 1,600,000          5.95%, 4/1/98.................................................................          1,637,040
 1,600,000          5.95%, 10/1/98................................................................          1,645,696
 1,600,000          5.95%, 10/1/99................................................................          1,640,640
   100,000       Philadelphia Redevelopment MFH Revenue VRDN, 4.00%, 12/1/09,
                    LOC: Marine Midland Bank......................................................            100,000
 2,630,000       Philadelphia Water and Wastewater Revenue Bonds, 4.50%, 6/15/97..................          2,641,309
   200,000       Sharon Regional Health System Authority Hospital Revenue Bonds,
                   5.50%, 12/1/97.................................................................            202,282
 
Puerto Rico - 5.9%
 1,350,000       Puerto Rico Commonwealth Infrastructure Financing Authority Revenue
                   Bonds, Series A, 7.40%, 7/1/98.................................................          1,424,372
28,000,000       Puerto Rico Electric Power Authority Revenue Bonds, Series W, 5.00%,
                   7/1/98.........................................................................         28,308,841
 
South Dakota - 2.2%
 1,000,000       Housing Development Authority, Home Ownership Mortgage Revenue
                   Bonds, Series A, 4.60%, 5/1/99, TOA: Banco Santander...........................            998,630
10,000,000       Housing Development Authority, Puttable Floating Option Tax-Exempt
                   Receipts, 3.60%, 5/1/13........................................................         10,000,000
</TABLE> 

22 - CALVERT TAX-FREE RESERVES                  SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
<TABLE> 
<CAPTION> 
PRINCIPAL
AMOUNT                                                                  VALUE
================================================================================
<S>                                                                     <C>
TENNESSEE - 2.2%
$11,000,000  Roane County Industrial Board and Solid Waste 
                Disposal Revenue Bonds, 5.90%, 11/1/20, 
                LOC: Long Term Credit Bank of Japan
                (Tender 11/1/96 @ 100)............................. $ 11,018,980

 
TEXAS - 2.5%
  3,095,000  Brazos County Health Facilities Development, 
                St. Joseph Hospital and Health Center 
                Revenue Bonds, 4.875%, 1/1/98......................    3,105,461
  1,000,000  General Obligation Bonds, Series A, 
                4.625%, 10/1/97....................................    1,009,380
  1,490,000  Irving Hospital Authority Healthcare System 
                Revenue Bonds, Series A, 4.50%, 7/1/98, 
                INSUR: FSA.........................................    1,491,982
  7,100,000  Orange County Navigation and Port District 
                Horsehead Reservoir Development Project 
                Revenue VRDN, 4.75%, 10/1/22,                 
                LOC: Long Term Credit Bank of Japan................    7,100,000
 

VERMONT - 1.3%
  5,245,000  Student Assistance Corporation Series A III 
                Variable Promissory Notes, 4.375%, 12/15/96........    5,250,402                
    250,000  Vermont Municipal Bond Banks Series 1, 6.75%, 12/1/97.      259,915                
  1,000,000  Vermont General Obligation Bond Series B,  
                6.60%, 10/15/96....................................    1,008,510

 
VIRGINIA - 0.7%
  1,450,000  Henrico County IDA Revenue VRDN, 4.05%, 10/1/00,
                LOC: Tokai Bank, Ltd...............................    1,450,000
  2,120,000  Virginia State Housing Development Authority 
                Construction Loan Notes, 6.875%, 1/1/17 (Tender 
                at any interest payment date)......................    2,140,903
                
               
WASHINGTON - 1.6%
  8,000,000  Washington State General Obligation Bonds, 
                Series R, 4.20%, 8/1/98............................    7,985,440

 
WEST VIRGINIA - 3.0%
             School Building Authority Revenue Bonds:
  3,730,000     6.25%, 7/1/96......................................    3,730,746
 11,295,000     7.00%, 7/1/97......................................   11,619,844

 
OTHER - 4.3%
  2,000,000  Absaloka Casino Enterprise Bond Anticipation 
                Notes, 8.50%, 12/1/97..............................    2,009,300
  9,000,000  Fort Mojave Indian Tribe of Arizona, 
                California and Nevada Public Facilities
                Combined Limited Obligation and Revenue 
                Bonds Adjustable Rate and Tender Series
                A of 1993, 5.75%, 12/1/18 (Tender 12/1/96 @ 100)...    9,041,850
  3,900,000  Oneida Utilities Commission (An Instrumentality 
                of the Oneida Tribe of Indians of Wisconsin) 
                Government Facilities Lease Revenue Bonds,                 
                Series 1993, 5.75%, 7/1/96.........................    3,900,312
  6,620,000  Putable Floating Option Tax-Exempt Receipts 
                Series PP4, 3.75%, 12/1/24, TOA: Merrill Lynch.....    6,620,000                
                                                                    ------------
 
             TOTAL INVESTMENTS (Cost $497,781,749) - 98.9%.........  499,461,360
             Other assets and liabilities, net - 1.1%..............    5,791,957
                                                                    ------------
             NET ASSETS - 100%..................................... $505,253,317
                                                                    ============
</TABLE> 


SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 23
<PAGE>

<TABLE>
<CAPTION>
NET ASSETS CONSIST OF:                                                  VALUE
- --------------------------------------------------------------------------------
<S>                                                               <C>
Paid in capital applicable to the following outstanding shares
  of beneficial interest, unlimited number of no par shares
  authorized:
      Class A: 44,614,301 shares outstanding ...................    $475,441,495
      Class C: 2,664,174 shares outstanding ....................      28,395,518
Undistributed net investment income ............................         221,045
Accumulated realized gain (loss) on investments ................        (484,352)
Net unrealized appreciation (depreciation) on investments ......       1,679,611
                                                                     -----------
   Net assets ..................................................    $505,253,317
                                                                     ===========
NET ASSET VALUE PER SHARE                                         
- ---------------------------------------------------------------------------------
Class A (based on net assets of $476,885,624) ..................          $10.69
                                                                           =====
Class C (based on net assets of $28,367,693) ...................          $10.65                            
                                                                           ===== 
</TABLE>
  
  
See notes to financial statements.
  
24 - CALVERT TAX-FREE RESERVES                  SEMI-ANNUAL REPORT (UNAUDITED)
  


<PAGE>
 
                              Long-Term Portfolio
                            Statement of Net Assets
                                 June 30, 1996

<TABLE>
<CAPTION>

Principal
Amount                                                                  Value
- --------------------------------------------------------------------------------

                         Municipal Obligations - 96.6%
<S>                                                                   <C>
ALABAMA - 2.8%
 $1,500,000 Auburn IDA Board Revenue VRDN, 6.35%, 12/1/16,
             LOC: Daiwa Bank, Ltd................................... $1,500,000
 
CALIFORNIA - 5.9%
  1,000,000 Montebello Unified School District Certificate of
             Participation Revenue Bonds, 6.30%, 6/1/11.............  1,008,760
  1,000,000 San Diego MFH, La Cima Apartments Revenue VRDN, 6.00%,
             12/1/08, LOC: Daiwa Bank, Ltd..........................  1,000,000
  1,000,000 Walnut Valley School District General Obligation Bonds,
             6.10%, 8/1/08, INSUR: AMBAC............................  1,067,010
 
COLORADO - 3.7%
            Denver City and County Airport Revenue Bonds, Series A:
    500,000  7.00%, 11/15/99........................................    531,190
  1,300,000  7.20%, 11/15/02........................................  1,406,574
 
DELAWARE - 0.2%
     80,000 Dover Electric Power Revenue Bonds, 7.00%, 7/1/15.......     86,876
 
FLORIDA - 18.6%
  1,000,000 Brevard County School Board Certificates of Participation,
             Series A, 5.40%, 7/1/10................................    990,310
    440,000 Collier County Special Assessment Revenue Bonds, 5.375%,
             11/1/07................................................    443,986
  1,500,000 Dade County IDA Revenue Bonds, 8.00%, 6/1/22............  1,513,320
  1,000,000 Flagler County Special Assessment Revenue Bonds, 7.20%,
             7/1/14.................................................  1,095,230
  1,000,000 Palm Beach County School Board Certificates of
             Participation, Series A, 5.375%, 8/1/15, INSUR: AMBAC..    950,160
  2,500,000 Tampa Capital Improvement Program Revenue Bonds,
             Series B, 8.375%, 10/1/18, IA: Den Danske Bank.........  2,656,350
  2,000,000 Tampa Palms Community Development Special Assessment
             Revenue Bonds, 5.90%, 5/1/08, INSUR: MBIA..............  2,102,220
 
GEORGIA - 1.9%
  1,000,000 DeKalb County MFH Revenue Bonds, 6.50%, 1/1/26..........    998,690
 
HAWAII - 1.8%
  1,000,000 Honolulu General Obligation Bonds, 5.00%, 10/1/13.......    927,810
 
INDIANA - 2.1%
  1,000,000 Indianapolis Local Public Improvement Bond Bank Revenue
             Bonds, 6.75%, 2/1/14...................................  1,100,310
 
</TABLE>

SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 25
<PAGE>
 
<TABLE>
<CAPTION>
 
Principal
Amount                                                                                                 Value
- ------------------------------------------------------------------------------------------------------------
<S>          <C>                                                                                     <C> 
Kansas - 1.6%
  $810,000    Sedgwick County Mortgage Loan Revenue Bonds, Series C, 8.625%,
                11/1/18, GNMA Collateralized..... .....................................           $  856,105  
 
Louisiana - 6.9%
              Louisiana Public Finance Agency MFH Revenue Bonds:
 1,690,000      7.75%, 11/1/16, INSUR: Asset Guaranty..................................            1,804,700
 1,725,000      7.00%, 6/1/24, INSUR: Asset Guaranty...................................            1,787,066

Maryland - 6.6%
 2,100,000    Cambridge Economic Development Revenue Bonds, 8.50%, 4/1/14..............            2,255,442
   950,000    Maryland State Community Development Authority Mortgage
                Revenue Bonds, 7.70%, 4/1/15...........................................              985,055
   200,000    Ocean City IDA Revenue VRDN, 5.3625%, 7/1/13, LOC: First National
                Bank of Maryland.......................................................              200,000
 
Michigan - 2.1%
 1,000,000    State Hospital Finance Authority Revenue Bonds, 7.00%, 11/1/21...........            1,073,380

Mississippi - 4.1%
 2,000,000    Mississippi Hospital Equipment and Facilities Authority Revenue Bonds,
                7.50%, 8/1/16, GIC: Banque National de Paris...........................            2,158,140
 
New York - 10.4%
 1,000,000    New York City General Obligation Bonds, Series E, 5.75%, 2/15/09.........              949,160
 2,000,000    New York City Municipal Water Finance Authority Revenue Bonds,
                Series B, 5.75%, 6/15/26, INSUR: MBIA..................................            1,960,760
 2,500,000    New York and New Jersey Port Authority Ninety-Third Series
                Consolidated Revenue Bonds, 6.125%, 6/1/2094...........................            2,548,775
 
Ohio - 3.7%
 1,000,000    Cleveland Waterworks Revenue Bonds, 5.50%, 1/1/21, INSUR: MBIA...........              963,540
 1,000,000    State Department of Transportation Certificates of Participation, 6.125%,
                4/15/15, INSUR: MBIA...................................................            1,007,410
 
Pennsylvania - 6.7%
 1,350,000    Northeastern Pennsylvania Hospital Authority Revenue Bonds, 7.65%,
                7/1/10, (Pre-refunded 7/1/99 @ 102.....................................            1,468,840
 2,000,000    Philadelphia Airport Revenue Bonds, 9.00%, 6/15/15.......................            2,048,040

Rhode Island - 2.1%
   500,000    Port Authority & Economic Development Corp. Airport Revenue Bonds,
                Series A, 7.00%, 7/1/14, INSUR: FSA....................................              561,095
   500,000    State Housing & Mortgage Finance Corp. Revenue Bonds, Series B,
                7.95%, 10/1/30.........................................................              524,965
 
Texas - 2.0%
 1,000,000    Houston Water Conveyance System Contract Certificates of Participation,
                6.125%, 12/15/09, INSUR: AMBAC.........................................            1,062,800
</TABLE>

26 - CALVERT TAX-FREE RESERVES   SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>

<TABLE>
<CAPTION>
PRINCIPAL
AMOUNT                                                                                                                    VALUE
- ----------------------------------------------------------------------------------------------------------------------------------
<S>              <C>                                                                                                    <C>
VERMONT - 2.3%
    $1,250,000   Vermont Educational and Health Buildings Finance Agency Hospital
                   Revenue Bonds, 6.00%, 9/1/06......................................................................   $1,222,013

VIRGINIA - 5.8%
     1,000,000   Arlington County General Obligation Bonds, Series 1993,
                   6.00%, 6/1/11.....................................................................................    1,059,840
     1,000,000   Henrico County IDA Revenue Bonds, 5.45%, 1/1/14.....................................................      944,710

     1,000,000   Virginia State Housing Development Authority Revenue Bonds,
                   6.00%, 7/1/03.....................................................................................    1,019,440

WASHINGTON - 3.4%
     1,915,000   State Public Power Supply Revenue Bonds, Series B, 5.50%, 7/1/17,
                   INSUR: MBIA.......................................................................................    1,782,061

OTHER - 1.9%
     1,000,000   Oneida Utility Community Government Lease Revenue Bonds,
                   6.25%, 7/1/97.....................................................................................    1,012,550
                                                                                                                       -----------

       TOTAL INVESTMENTS (Cost $48,657,788) - 96.6%..................................................................   50,634,683
       Other assets and liabilities, net - 3.4%......................................................................    1,768,903
                                                                                                                       -----------
       NET ASSETS - 100%.............................................................................................  $52,403,586
                                                                                                                       ===========

NET ASSETS CONSIST OF:
- -----------------------------------------------------------------------------------------------------------------------------------
Paid in capital applicable to the following outstanding shares of beneficial interest,
  unlimited number of no par value shares authorized:
    Class A: 3,060,821 shares outstanding............................................................................  $48,912,085
    Class C: 104,758 shares outstanding..............................................................................    1,716,952
Undistributed net investment income..................................................................................      199,583
Accumulated net realized gain (loss) on investments..................................................................     (401,929)
Net unrealized appreciation (depreciation) on investments............................................................    1,976,895
                                                                                                                       -----------
  Net assets.........................................................................................................  $52,403,586
                                                                                                                       ===========

NET ASSET VALUE PER SHARE
- -----------------------------------------------------------------------------------------------------------------------------------
Class A (based on net assets of $50,687,297).........................................................................      $16.56
                                                                                                                       ===========
Class C (based on net assets of $1,716,289)..........................................................................      $16.38
                                                                                                                       ===========
</TABLE>


Explanation of Guarantees:                Abbreviations:
BPA: Bond-Purchase Agreement              IDA: Industrial Development Authority
GA: Guaranty Agreement                    MFH: Multi-Family Housing
LOC: Letter of Credit                     VRDN: Variable Rate Demand Notes
C/LOC: Collateralized LOC
GIC: Guaranteed Investment Contract
INSUR: Insurance
SURBD: Surety Bond
TOA: Tender Option Agreement
IA: Investment Agreement

Certain securities have optional or mandatory tender features which give them a
shorter effective maturity date.

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 27
<PAGE>

                           STATEMENTS OF OPERATIONS
                        SIX MONTHS ENDED JUNE 30, 1996
 
<TABLE>
<CAPTION>

                                         Money        Limited-       Long- 
                                        Market         Term           Term
NET INVESTMENT INCOME                  Portfolio     Portfolio     Portfolio
- --------------------------------------------------------------------------------

<S>                                   <C>           <C>           <C>
Investment Income
 Interest income....................  $36,771,502   $12,558,070   $  1,748,928
                                      -----------   -----------   ------------
Expenses
 Investment advisory fee............    4,024,180     1,518,762        164,008
 Transfer agency fees and expenses..    1,385,556       115,104         15,388
 Distribution plan expenses:
   Class MMP........................       74,538           --             -- 
   Class A..........................          --            --          23,825
   Class C..........................          --         82,272          8,628
 Trustees' fees and expenses........       77,842        21,402          2,378
 Administrative fees................       65,320        18,178          1,956
 Custodian fees.....................       57,705        27,094          7,938
 Registration fees..................      109,900        36,688         18,292
 Reports to shareholders............      330,801        53,137          6,555
 Professional fees..................       77,333        18,502          2,449
 Miscellaneous......................      116,350        61,932         10,995
                                      -----------   -----------    -----------
  Total expenses....................    6,319,525     1,953,071        262,412
  Fees paid indirectly..............      (57,705)      (27,094)        (7,938)
                                      -----------   -----------    -----------
   Net expenses.....................    6,261,820     1,925,977        254,474
                                      -----------   -----------    -----------
   NET INVESTMENT INCOME............   30,509,682    10,632,093      1,495,454
                                      -----------   -----------    -----------
REALIZED AND UNREALIZED
GAIN (LOSS) ON INVESTMENTS
- --------------------------------------------------------------------------------
Net realized gain (loss)............      (24,711)        7,820       (428,927)
Change in unrealized appreciation
 or depreciation....................          --     (1,476,383)    (2,106,582)
                                      -----------   -----------    -----------
  NET REALIZED AND
  UNREALIZED GAIN (LOSS)
  ON INVESTMENTS....................      (24,711)   (1,468,563)    (2,535,509)
                                      -----------   -----------    -----------
  INCREASE (DECREASE) IN
  NET ASSETS RESULTING
  FROM OPERATIONS...................  $30,484,971   $ 9,163,530    ($1,040,055)
                                      ===========   ===========    ===========
</TABLE>

See notes to financial statements.

28 - CALVERT TAX-FREE RESERVES                    SEMI-ANNUAL REPORT (UNAUDITED)

<PAGE>
 
                            Money Market Portfolio
                      Statements of Changes in Net Assets

<TABLE>
<CAPTION>
                                                                     Six Months          Year Ended
                                                                        Ended           December 31,
Increase (Decrease) in Net Assets                                   June 30, 1996           1995
====================================================================================================
<S>                                                                <C>               <C>
Operations
 Net investment income...........................................  $    30,509,682   $    66,038,822
 Net realized gain (loss)........................................          (24,711)           (8,789)
                                                                   ---------------   ---------------
   Increase (Decrease) in Net Assets
   Resulting from Operations.....................................       30,484,971        66,030,033
                                                                   ---------------   ---------------

Distributions to shareholders from
 Net investment income:
  Class O shares.................................................      (29,832,140)      (65,599,120)
  Class MMPshares................................................         (570,958)         (339,143)
                                                                   ---------------   ---------------
 Total distributions.............................................      (30,403,098)      (65,938,263)
                                                                   ---------------   ---------------

Capital share transactions
 Shares sold:
  Class O shares.................................................    3,011,987,919     6,744,165,972
  Class MMP shares...............................................       28,586,392        57,608,751
 Reinvestment of distributions:
  Class O shares.................................................       27,876,770        63,374,528
  Class MMP shares...............................................          557,012           332,568
 Shares redeemed:
  Class O shares.................................................   (3,057,889,465)   (6,411,381,797)
  Class MMP shares...............................................      (33,714,581)      (16,212,303)
                                                                   ---------------   ---------------
 Total capital share transactions................................      (22,595,953)      437,887,719
                                                                   ---------------   ---------------

Total Increase (Decrease) in Net Assets..........................      (22,514,080)      437,979,489

Net Assets
====================================================================================================
Beginning of period..............................................    1,782,574,411     1,344,594,922
                                                                   ---------------   ---------------
End of period (including undistributed net investment income of
 $209,659 and $103,075, respectively)............................  $ 1,760,060,331   $ 1,782,574,411
                                                                   ===============   ===============

Capital Share Activity
====================================================================================================
Shares sold:
 Class O shares..................................................    3,011,987,919     6,744,165,972
 Class MMP shares................................................       28,586,392        57,608,751
Reinvestment of distributions:
 Class O shares..................................................       27,876,770        63,374,528
 Class MMP shares................................................          557,012           332,568
Shares redeemed:
 Class O shares..................................................   (3,057,889,465)   (6,411,381,797)
 Class MMP shares................................................      (33,714,581)      (16,212,303)
                                                                   ---------------   ---------------
Total capital share activity.....................................      (22,595,953)      437,887,719
                                                                   ===============   ===============
 </TABLE>


See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 29
<PAGE>
 
                             Limited-Term Portfolio
                      Statements of Changes in Net Assets


                                                                    
<TABLE> 
<CAPTION> 

                                                                    Six Months             Year Ended
                                                                       Ended              December 31,
Increase (Decrease) in Net Assets                                  June 30, 1996             1995
- --------------------------------------------------------------------------------------------------------
<S>                                                                <C>                   <C>
Operations
  Net investment income........................................    $  10,632,093         $  22,125,945
  Net realized gain (loss).....................................            7,820                (7,886)
  Change in unrealized appreciation or depreciation............       (1,476,383)            6,379,282
                                                                   -------------         -------------

       Increase (Decrease) in Net Assets
       Resulting from Operations...............................        9,163,530            28,497,341
                                                                   -------------         -------------

Distributions to shareholders from
  Net investment income:
     Class A shares............................................      (10,159,579)          (20,871,817)
     Class C shares............................................         (533,787)           (1,108,847)
                                                                   -------------         -------------
  Total distributions..........................................      (10,693,366)          (21,980,664)
                                                                   -------------         -------------

Capital share transactions
  Shares sold:
     Class A shares............................................      114,986,818           116,789,453
     Class C shares............................................       11,803,099            19,784,285
  Reinvestment of distributions:
     Class A shares............................................        7,805,494            18,399,341
     Class C shares............................................          498,153             1,059,645
  Shares redeemed:
     Class A shares............................................     (102,181,283)         (228,473,875)
     Class C shares............................................      (13,892,751)          (22,214,540)
                                                                   -------------         -------------
  Total capital share transactions.............................       19,019,530           (94,655,691)
                                                                   -------------         -------------

Total Increase (Decrease) in Net Assets........................       17,489,694           (88,139,014)
  Net Assets
- --------------------------------------------------------------------------------------------------------
Beginning of period............................................      487,763,623           575,902,637
                                                                   -------------         -------------
End of period (including undistributed net investment income of
  $221,045 and $282,318, respectively).........................    $ 505,253,317         $ 487,763,623
                                                                   =============         =============

Capital Share Activity
- --------------------------------------------------------------------------------------------------------
Shares sold:
     Class A shares............................................       10,725,593            10,928,746
     Class C shares............................................        1,105,434             1,858,790
Reinvestment of distributions:
     Class A shares............................................          729,387             1,722,285
     Class C shares............................................           46,723                99,532
Shares redeemed:
     Class A shares............................................       (9,530,619)          (21,385,078)
     Class C shares............................................       (1,301,623)           (2,086,783)
                                                                   -------------         -------------
Total capital share activity...................................        1,774,895            (8,862,508)
                                                                   =============         =============
</TABLE>


See notes to financial statements.

30-CALVERT TAX-FREE RESERVES        SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                              Long-Term Portfolio
                      Statements of Changes in Net Assets

<TABLE>
<CAPTION>
                                                                     Six Months          Year Ended
                                                                        Ended           December 31,
Increase (Decrease) in Net Assets                                   June 30, 1996           1995
====================================================================================================
<S>                                                                <C>               <C>
Operations
 Net investment income............................................   $ 1,495,454        $ 3,028,694
 Net realized gain (loss).........................................      (428,927)           772,934
 Change in unrealized appreciation or depreciation................    (2,106,582)         4,039,827
                                                                     -----------        -----------
   Increase (Decrease) in Net Assets
   Resulting from Operations......................................    (1,040,055)         7,841,455
                                                                     -----------        -----------

Distributions to shareholders from
 Net investment income:
  Class A shares..................................................    (1,447,203)        (2,815,221)
  Class C shares..................................................       (34,641)           (53,252)
 Net realized gain on investments:
  Class A shares..................................................             -           (300,655)
  Class C shares..................................................             -             (8,878)
                                                                     -----------        -----------
 Total distributions..............................................    (1,481,844)        (3,178,006)
                                                                     -----------        -----------

Capital share transactions
 Shares sold:
  Class A shares..................................................     3,279,326         11,805,684
  Class C shares..................................................       724,050            947,016
 Reinvestment of distributions:
  Class A shares..................................................     1,176,686          2,727,932
  Class C shares..................................................        33,617             59,797
 Shares redeemed:
  Class A shares..................................................    (8,687,455)        (9,010,280)
  Class C shares..................................................      (637,505)          (293,958)
                                                                     -----------        -----------
 Total capital share transactions.................................    (4,111,281)         6,236,191
                                                                     -----------        -----------

Total Increase (Decrease) in Net Assets...........................    (6,633,180)        10,899,640

Net Assets
====================================================================================================
Beginning of period...............................................    59,036,766         48,137,126
                                                                     -----------        -----------
End of period (including undistributed net investment income of
 $199,583 and $185,973, respectively).............................   $52,403,586        $59,036,766
                                                                     ===========        ===========

Capital Share Activity
====================================================================================================
Shares sold:
 Class A shares...................................................       194,979            707,071
 Class C shares...................................................        43,508             56,987
Reinvestment of distributions:
 Class A shares...................................................        70,026            163,655
 Class C shares...................................................         2,023              3,580
Shares redeemed:
 Class A shares...................................................      (517,721)          (542,469)
 Class C shares...................................................       (38,712)           (18,019)
                                                                     -----------        -----------
Total capital share activity......................................      (245,897)           370,805
                                                                     ===========        ===========
 </TABLE>



SEMI-ANNUAL REPORT (UNAUDITED)                   CALVERT TAX-FREE RESERVES - 31

<PAGE>
 
                         NOTES TO FINANCIAL STATEMENTS

Note A--Significant Accounting Policies

General: The Calvert Tax-Free Reserves (the "Fund") is registered under the
Investment Company Act of 1940 as a diversified, open-end management investment
company. The Fund is comprised of six separate portfolios, three of which are
reported herein; Money Market, Limited-Term and Long-Term. The operations of
each series are accounted for separately. Each Portfolio offers shares of
beneficial interest. Money Market Class O and Class MMP shares are sold without
a sales charge. Limited-Term and Long-Term offer both Class A and Class C
shares. Class A shares are sold with a maximum front-end sales charge of 2.00%
for Limited-Term and 3.75% for Long-Term. Class C shares, which have no
transaction-based sales charge, have a higher annual expense rate than Class A.
Each class has different: (a) dividend rates due to differences in Distribution
Plan expenses and other class specific expenses, (b) exchange privileges and (c)
class specific voting rights.

On April 26, 1996, the net assets of Calvert Tax-Free Reserves New Jersey Money
Market Portfolio, ("New Jersey"), approximately $25.6 million, were merged into
Money Market Portfolio. The merger was a tax-free exchange, whereby Class O
shares were issued to the former New Jersey shareholders.

Security Valuation: Municipal securities are valued utilizing the average of bid
prices or at bid prices based on a matrix system (which considers such factors
as security prices, yields, maturities and ratings) furnished by dealers through
an independent pricing service. Securities listed or traded on a national
securities exchange are valued at the last reported sale price. All securities
for Money Market are valued at amortized cost which approximates market. Other
securities and assets for which market quotations are not available or deemed
inappropriate are valued in good faith under the direction of the Board of
Trustees.

Options: Long-Term may write or purchase option securities. The option premium
is the basis for recognition of unrealized or realized gain or loss on the
option. The cost of securities acquired or the proceeds from securities sold
through the exercise of the option is adjusted by the amount of the premium.

Futures Contracts: Long-Term may enter into futures contracts agreeing to buy or
sell a financial instrument for a set price at a future date. The Portfolio
maintains securities with a value equal to its obligation under each contract.
Initial margin deposits of either cash or securities are made upon entering into
futures contracts; thereafter, variation margin payments are made or received
daily reflecting the change in market value. Unrealized or realized gains and
losses are recognized based on the change in market value. Risks of futures
contracts arise from the possible illiquidity of the futures markets and the
movement in the value of the investment or in interest rates.

Security Transactions and Investment Income: Security transactions are accounted
for on trade date. Realized gains and losses are recorded on an identified cost
basis. Interest income, accretion of discount and amortization of premium are
recorded on an accrual basis.

32 - CALVERT TAX-FREE RESERVES                    SEMI-ANNUAL REPORT (UNAUDITED)

<PAGE>
 
Distributions to Shareholders: Distributions to shareholders are recorded by the
Fund on ex-dividend date. Dividends from net investment income are accrued daily
and paid monthly for Money Market; dividends from net investment income are
declared and paid monthly for Limited-Term and Long-Term. Distributions from net
realized capital gains, if any, are paid at least annually. Distributions are
determined in accordance with income tax regulations which may differ from
generally accepted accounting principles, accordingly, periodic
reclassifications are made within the Fund's capital accounts to reflect income
and gains available for distribution under income tax regulations.

Expense Offset Arrangements: The Fund has an arrangement with its custodian bank
whereby the custodian's fees are paid indirectly by credits earned on the Fund's
cash on deposit with the bank. Such deposit arrangement is an alternative to
overnight investments.

Federal Income Taxes: No provision for federal income or excise tax is required
since the Fund intends to continue to qualify as a regulated investment company
under the Internal Revenue Code and to distribute substantially all of its
earnings.

Note B--Related Party Transactions

Calvert Asset Management Company, Inc. (the "Advisor") is wholly-owned by
Calvert Group, Ltd. ("Calvert"), which is indirectly wholly-owned by Acacia
Mutual Life Insurance Company. The Advisor provides investment advisory services
and pays the salaries and fees of officers and affiliated Trustees of the Fund.
For its services, the Advisor receives monthly fees based on the following
annual rates of average daily net assets:

<TABLE>
<CAPTION>

                             First $500     Next $500        Over
                              Million        Million      $1 Billion
====================================================================
<S>                          <C>            <C>           <C>
Money Market...............     .50%          .45%           .40%
Limited-Term...............     .60%          .50%           .40%
Long-Term..................     .60%          .50%           .40%
</TABLE>

Calvert Administrative Services Company, an affiliate of the Advisor, provides
administrative services to the Fund for an annual fee, payable monthly of
$200,000, which is allocated to all of the Portfolios of the Fund based on their
relative net assets.

Calvert Distributors, Inc., an affiliate of the Advisor, is the distributor and
principal underwriter for the Fund. Distribution Plans, adopted by Class MMP of
Money Market, Class A of Long-Term and Class C of both Limited-Term and Long-
Term, allow the Portfolios to pay the distributor for expenses and services
associated with distribution of shares. The expenses paid may not exceed an
annual rate of average daily net assets of: .35% on Class MMP and Class A, and
 .55% and 1% on Class C of Limited-Term and Long-Term, respectively.

The Distributor received $0 and $4,656 as its portion of commissions charged on
sales of the Limited-Term and Long-Term Class A shares, respectively.

Calvert Shareholder Services, Inc., an affiliate of the Advisor, acts as
transfer, dividend disbursing and shareholder servicing agent for the Fund.

SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 33

<PAGE>
 
Each Trustee who is not affiliated with the Advisor receives an annual fee of
$20,250 plus up to $1,200 for each Board and Committee meeting attended.
Trustee's fees are allocated to each of the funds served.

NOTE C--INVESTMENT ACTIVITY

During the period, purchases and sales of investments, other than short-term
securities, were:

<TABLE> 
<CAPTION> 

                             Limited-Term      Long-Term
=========================================================
<S>                          <C>              <C> 
Purchases..................  $ 93,046,420     $ 8,846,693
Sales......................   101,864,861      11,509,234
</TABLE> 

Money Market held only short-term investments.

The cost of investments owned at June 30, 1996 was substantially the same for
federal income tax and financial reporting purposes for each Portfolio. The
following table presents the components of net unrealized appreciation
(depreciation) as of June 30, 1996 and the net realized capital loss
carryforward as of December 31, 1995 with expiration dates:

<TABLE>
<CAPTION>

                                   Money
                                   Market     Limited-Term     Long-Term
=========================================================================
<S>                                <C>        <C>              <C> 
Unrealized appreciation.......          --     $1,851,890      $2,101,094
Unrealized depreciation.......          --       (172,279)       (124,199)
                                               ----------      ----------
   Net........................          --      1,679,611       1,976,895
                                               ==========      ==========
 
Capital loss carry forward....     $99,863     $  492,172              --
Expiration dates..............        2003           2002              --
</TABLE>

Capital losses may be utilized to offset current and future capital gains until
expiration.

As a cash management practice, Portfolios may sell or purchase short-term
variable rate demand notes from other Portfolios managed by the Advisor. The
transactions are effected at par with no gain or loss to the Portfolio, in
accordance with policies of the Fund.

Additionally, the Portfolios effected transactions with other Portfolios, which
resulted in net gains (losses) on sales of securities of $470 and ($865) in
Money Market and Long-Term, respectively, and cost of purchases of $21,687,880
in Limited-Term; all were executed at independently derived prices.

NOTE D--SUBSEQUENT EVENT

Effective on or about October 28, 1996, all outstanding Class C shares in both
the Limited-Term and Long-Term Portfolios will be converted automatically into
an equivalent value of Class A shares. This transaction is a non-taxable
exchange and no sales charge will be applied to the Class A shares issued.

34 - CALVERT TAX-FREE RESERVES                    SEMI-ANNUAL REPORT (UNAUDITED)

<PAGE>

                             FINANCIAL HIGHLIGHTS
                            MONEY MARKET PORTFOLIO
 
<TABLE>
<CAPTION>
                                                            CLASS O SHARES
                                                            PERIODS ENDED
                                     ----------------------------------------------------
                                       June 30,                    December 31,
                                         1996            1995         1994         1993
=========================================================================================
<S>                                  <C>             <C>          <C>          <C>
Net asset value, beginning.......... $     1.00      $     1.00   $     1.00   $     1.00
                                     ==========      ==========   ==========   ==========
Income from investment operations
- ---------------------------------
 Net investment income..............       .017            .040         .028         .024
                                     ----------      ----------   ----------   ----------
Distributions from
- ------------------
 Net investment income..............      (.017)          (.040)       (.028)       (.024)
                                     ----------      ----------   ----------   ----------
Net asset value, ending............. $     1.00      $     1.00   $     1.00   $     1.00
                                     ==========      ==========   ==========   ==========

Total return*.......................       1.68%           4.02%        2.81%        2.41%
                                     ==========      ==========   ==========   ==========
Ratios to average net assets:
 Net investment income..............       3.36%(a)        3.93%        2.75%        2.37%
                                     ==========      ==========   ==========   ==========
 Total expenses +...................        .68%(a)         .62%        ----         ----    
                                     ==========      ==========   ==========   ==========
 Net expenses.......................        .67%(a)         .61%         .62%         .60%
                                     ==========      ==========   ==========   ==========
Net assets, ending (in thousands)... $1,722,892      $1,740,839   $1,344,595   $1,500,614
                                     ==========      ==========   ==========   ==========
Number of shares outstanding,
 ending (in thousands)..............  1,722,931       1,740,948    1,344,668    1,500,557
                                     ==========      ==========   ==========   ==========
</TABLE>

<TABLE>
<CAPTION>
                                            CLASS O SHARES        CLASS MMP SHARES
                                            PERIODS ENDED          PERIODS ENDED
                                     -----------------------   ---------------------
                                            December 31,       June 30, December 31,
                                          1992        1991       1996        1995/\
====================================================================================
<S>................................. <C>          <C>          <C>          <C>
Net asset value, beginning.......... $     1.00   $     1.00   $  1.00      $  1.00
                                     ==========   ==========   =======      =======
Income from investment operations
- ---------------------------------
 Net investment income..............       .031         .048      .013         .008
                                     ----------   ----------   -------      -------
Distributions from
- ------------------
 Net investment income..............      (.031)       (.048)    (.013)       (.008)
                                     ----------   ----------   -------      -------
Net asset value, ending............. $     1.00   $     1.00   $  1.00      $  1.00
                                     ==========   ==========   =======      =======

Total return*.......................       3.18%        4.96%     1.35%         .79%
                                     ==========   ==========   =======      =======
Ratios to average net assets:
 Net investment income..............       3.10%        4.79%     2.70%(a)     3.19%(a)
                                     ==========   ==========   =======      =======
 Total expenses +...................       ----         ----      1.33%(a)     1.35%(a)
                                     ==========   ==========   =======      =======
 Net expenses.......................        .59%         .61%     1.33%(a)     1.34%(a)
                                     ==========   ==========   =======      =======
Net assets, ending (in thousands)... $1,552,106   $1,382,330   $37,168      $41,736
                                     ==========   ==========   =======      =======
Number of shares outstanding,
 ending (in thousands)..............  1,552,061    1,382,288    37,161       41,732
                                     ==========   ==========   =======      =======

</TABLE>

SEMI-ANNUAL REPORT (UNAUDITED)                     CALVERT TAX-FREE RESERVES -35
<PAGE>

<TABLE>
<CAPTION>
                                                                       FINANCIAL HIGHLIGHTS
                                                              LIMITED-TERM PORTFOLIO (CLASS A SHARES)


                                                                          PERIODS ENDED
                                                                -------------------------------------
                                                              JUNE 30,           DECEMBER 31,
                                                               1996           1995          1994
- -----------------------------------------------------------------------------------------------------
<S>                                                             <C>           <C>        <C>
Net asset value, beginning..................                   $10.72         $10.59         $10.72
                                                            ==========     =========       ========
Income from investment operations
  Net investment income.....................                      .23            .45            .39
  Net realized and unrealized gain (loss)...                     (.03)           .13           (.13)
                                                            ---------      ---------       --------
  Total from investment operations..........                      .20            .58            .26
                                                            ---------      ---------       --------
Distributions from
   Net investment income....................                    (.23)           (.45)          (.39)
                                                            --------       ---------       --------
Total increase (decrease) in net asset value                    (.03)            .13           (.13)
                                                            --------       ---------       --------
Net asset value, ending.....................                  $10.69          $10.72         $10.59
                                                            ========       =========       ========
Total return*...............................                    1.85%           5.55%          2.42%
                                                            ========       =========       ========
Ratios to average net assets:               
  Net investment income.....................                    4.23%(a)        4.21%          3.60%
                                                            ========       =========       ========

  Total expenses +..........................                     .73%(a)         .71%          ----
                                                            ========       =========       ========
  Net expenses..............................                     .71%(a)         .70%           .66%
                                                            ========       =========       ========
Portfolio turnover..........................                      26%             33%            27%
                                                            ========       =========       ========
Net assets, ending (in thousands)...........                $476,886        $457,707       $544,822
                                                            ========       =========       ========
Number of shares outstanding,
   ending (in thousands)....................                  44,614          42,690         51,424
                                                            ========       =========       ========
</TABLE>

<TABLE>
<CAPTION>
                                                                           YEARS ENDED
                                                           ------------------------------------------
                                                                          DECEMBER 31,
                                                             1993           1992            1991
- -----------------------------------------------------------------------------------------------------
<S>                                                       <C>           <C>              <C>
Net asset value, beginning...................                $10.68         $10.65           $10.61
                                                           ========       ========         ========
Income from investment operations
  Net investment income......................                   .38            .49              .64
  Net realized and unrealized gain (loss)....                   .04            .03              .03
                                                           --------       --------         --------
  Total from investment operations...........                   .42            .52              .67
                                                           --------       --------         --------
Distributions from
  Net investment income......................                  (.38)          (.49)            (.63)
                                                           --------       --------         --------
Total increase (decrease) in net asset value.                   .04            .03              .04
                                                           --------       --------         --------
Net asset value, ending......................                $10.72         $10.68           $10.65
                                                           ========       ========         ========

Total return*................................                  4.02%          4.99%            6.46%
                                                           ========       ========         ========
Ratios to average net assets:                     
  Net investment income......................                  3.59%          4.58%            5.99%
                                                           ========       ========         ========
  Total expenses +...........................                  ----           ----             ----
                                                           ========       ========         ========
  Net expenses...............................                   .67%           .71%            .73%
                                                           ========       ========         ========
Portfolio turnover...........................                    14%             5%              1%
                                                           ========       ========         ========
Net assets, ending (in thousands)............              $663,305       $567,419        $294,308
                                                           ========       ========         ========
Number of shares outstanding,                
  ending (in thousands)......................                61,861         53,140          27,644
                                                           ========       ========        =========


36 - CALVERT TAX-FREE RESERVES                        SEMI-ANNUAL REPORT (UNAUDITED)
</TABLE>

<PAGE>

                             FINANCIAL HIGHLIGHTS
                   LIMITED-TERM PORTFOLIO (CLASS C SHARES) 
<TABLE>
<CAPTION>
                                                        PERIODS ENDED
                                                --------------------------------
                                                JUNE 30,         DECEMBER 31,
                                                  1996        1995        1994#
- --------------------------------------------------------------------------------
<S>                                             <C>          <C>       <C>
Net asset value, beginning....................  $ 10.68      $ 10.56     $ 10.70
                                                =======      =======     =======
Income from investment operations
- ---------------------------------
 Net investment income........................      .18          .38         .27
 Net realized and unrealized gain (loss)......     (.02)         .13        (.12)
                                                -------      -------     -------
 Total from investment operations.............      .16          .51         .15
                                                -------      -------     -------
Distributions from
- ------------------
 Net investment income........................     (.19)        (.39)       (.29)
                                                -------      -------     -------
Total increase (decrease) in net asset value..     (.03)         .12        (.14)
                                                -------      -------     -------
Net asset value, ending.......................  $ 10.65      $ 10.68     $ 10.56
                                                =======      =======     =======
Total return* ................................     1.51%        4.86%       1.43%
                                                =======      =======     =======
Ratios to average net assets:
 Net investment income........................     3.50%(a)     3.57%       3.05%(a)
                                                =======      =======     =======
 Total expenses +.............................     1.46%(a)     1.35%       ----
                                                =======      =======     =======
 Net expenses.................................     1.45%(a)     1.34%       1.38%(a)
                                                =======      =======     =======
Portfolio turnover............................       26%          33%         27%
                                                =======      =======     =======
Net assets, ending (in thousands).............  $28,368      $30,057     $31,081
                                                =======      =======     =======
Number of shares outstanding,
 ending (in thousands)........................    2,664        2,814       2,942
                                                =======      =======     =======
</TABLE>

SEMI-ANNUAL REPORT (UNAUDITED)                      CALVERT TAX-FREE RESERVES-37
<PAGE>
 
                             FINANCIAL HIGHLIGHTS
                     LONG-TERM PORTFOLIO (CLASS A SHARES)

<TABLE>
<CAPTION>
                                                            PERIODS ENDED
                                                --------------------------------
                                                JUNE 30,        DECEMBER 31,
                                                  1996         1995      1994
- --------------------------------------------------------------------------------
<S>                                             <C>          <C>       <C>
NET ASSET VALUE, BEGINNING....................  $ 17.31      $ 15.83   $ 17.15
                                                =======      =======   =======
Income from investment operations
- ---------------------------------
  Net investment income.......................      .47          .95       .93
  Net realized and unrealized gain (loss).....     (.76)        1.53     (1.33)
                                                -------      -------   -------  
  Total from investment operations............     (.29)        2.48      (.40)
                                                -------      -------   ------- 
Distributions from
- ------------------
  Net investment income.......................     (.46)        (.91)     (.92)
  Net realized gains..........................       --         (.09)       --
                                                -------      -------   -------
    Total distributions.......................     (.46)       (1.00)     (.92)
                                                -------      -------   -------
Total increase (decrease) in net asset value..     (.75)        1.48     (1.32)
                                                -------      -------   -------
NET ASSET VALUE, ENDING.......................  $ 16.56      $ 17.31   $ 15.83
                                                =======      =======   =======

Total return *................................    (1.68%)      16.05%    (2.30%)
                                                =======      =======   =======
Ratios to average net assets:
  Net investment income.......................     5.52%(a)     5.71%     5.73%
                                                =======      =======   =======
  Total expenses +............................      .91%(a)      .87%       --
                                                =======      =======   =======
  Net expenses................................      .88%(a)      .85%      .81%
                                                =======      =======   =======
Portfolio turnover............................       17%          58%       98%
                                                =======      =======   =======
NET ASSETS, ENDING (IN THOUSANDS).............  $50,687      $57,359   $47,267
                                                =======      =======   =======
Number of shares outstanding,
  ending (in thousands).......................    3,061        3,314     2,985
                                                =======      =======   =======


                                                            YEARS ENDED
                                                --------------------------------
                                                            DECEMBER 31,
                                                  1993         1992      1991
- --------------------------------------------------------------------------------
NET ASSET VALUE, BEGINNING....................  $ 16.32      $ 16.11   $ 15.35
                                                =======      =======   =======
Income from investment operations
- ---------------------------------
  Net investment income.......................      .94          .98       .97
  Net realized and unrealized gain (loss).....      .83          .20       .78
                                                -------      -------   -------
  Total from investments......................     1.77         1.18      1.75
                                                -------      -------   -------
Distributions from
- ------------------
  Net investment income.......................     (.94)        (.97)     (.99)
  Net realized gains..........................       --           --        --
                                                -------      -------   -------
    Total distributions.......................     (.94)        (.97)     (.99)
                                                -------      -------   -------
Total increase (decrease) in net asset value..      .83          .21       .76
                                                -------      -------   -------
NET ASSET VALUE, ENDING.......................  $ 17.15      $ 16.32   $ 16.11
                                                =======      =======   =======

Total return *................................    11.12%        7.60%    11.77%
                                                =======      =======   =======
Ratio to average net assets:
  Net investment income.......................     5.59%        6.06%     6.39%
                                                =======      =======   =======
  Total expenses +............................       --           --        --
                                                =======      =======   =======
  Net expenses................................      .78%         .82%      .78%
                                                =======      =======   =======
Portfolio turnover............................       97%         196%      276%
                                                =======      =======   =======
NET ASSETS, ENDING (IN THOUSANDS).............  $55,204      $45,665   $43,774
                                                =======      =======   =======

Number of shares outstanding,
  ending (in thousands).......................    3,219        2,799     2,718
                                                =======      =======   =======
</TABLE>                                        

38 - CALVERT TAX-FREE RESERVES                  SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                             FINANCIAL HIGHLIGHTS
                     LONG-TERM PORTFOLIO (CLASS C SHARES)

<TABLE>
<CAPTION>
                                                       Periods Ended
                                                ----------------------------
                                                June 30,      December 31,
                                                  1996       1995      1994# 
============================================================================ 
<S>                                             <C>         <C>      <C>
Net asset value, beginning....................  $17.13      $15.72   $16.86
Income from investment operations               ======      ======   ======
- ---------------------------------
 Net investment income........................     .33         .78      .58
 Net realized and unrealized gain (loss)......    (.75)       1.46    (1.04)
                                                ------      ------   ------
 Total from investment operations.............    (.42)       2.24     (.46)
                                                ------      ------   ------
Distributions from
- ------------------
 Net investment income........................    (.33)       (.74)    (.68)
 Net realized gains...........................      --        (.09)      --
                                                ------      ------   ------
  Total distributions.........................    (.33)        .83     (.68)
                                                ------      ------   ------
Total increase (decrease) in net asset value      (.75)       1.41    (1.14)
                                                ------      ------   ------
Net asset value, ending.......................  $16.38      $17.13   $15.72
                                                ======      ======   ======
Total return *................................   (2.46%)     14.51%   (2.24%)
                                                ======      ======   ======
Ratios to average net assets:
 Net investment income........................    3.95%(a)    4.34%    3.57%(a)
                                                ======      ======   ======  
 Total expenses +.............................    2.50%(a)    2.19%      --
                                                ======      ======   ======
 Net expenses.................................    2.47%(a)    2.17%    2.55%(a)
                                                ======      ======   ======
 Expenses reimbursed..........................      --          --     3.06%(a)
                                                ======      ======   ======
Portfolio turnover............................      17%         58%      98%
                                                ======      ======   ======
Net assets, ending (in thousands).............  $1,716      $1,678   $  871
                                                ======      ======   ======
Number of shares outstanding, ending
 (in thousands)...............................     105          98       55
                                                ======      ======   ======
</TABLE>

*  Total return is not annualized for periods of less than one year and does not
   reflect deduction of Class A front-end sales charge.

(a)Annualized

+  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.
 
/\ From October 2, 1995, inception.

#  From March 1, 1994, inception.

SEMI-ANNUAL REPORT (UNAUDITED)                    CALVERT TAX-FREE RESERVES - 39
<PAGE>
 
                      THIS PAGE INTENTIONALLY LEFT BLANK




40 - CALVERT TAX-FREE RESERVES                    SEMI-ANNUAL REPORT (UNAUDITED)

<PAGE>
 
                              To Open an Account:
                             .....................
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                               Yields and Prices:
                             .....................
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                             24 hours, 7 days a week
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                               Existing Account:
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                                   Impaired:
                             ..................... 
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                             .....................

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                                  Suite 1000N
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                             Registered, Certified
                               or Overnight Mail:
                             ....................

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                              c/o NFDS, 6th Floor
                                 1004 Baltimore
                             Kansas City, MO  64105

                                   Web Site:
                             .....................

                      Address: http://www.calvertgroup.com

                                   Principal
                                  Underwriter:
                             .....................
 
                          Calvert Distributors, Inc.
                             4550 Montgomery Avenue
                                  Suite 1000N
                            Bethesda, Maryland 20814

      This report is intended to provide fund information to shareholders.
 It is not authorized for distribution to prospective investors unless preceded
                        or accompanied by a prospectus.

<PAGE>
 
INVESTING with VISION [LOGO--CALVERT GROUP] A member of The Acacia Group


4550 Montgomery Avenue, Suite 1000N
Bethesda, Maryland 20814







<PAGE>
 
                                       CALVERT
                                       TAX-FREE RESERVES
                                       CALIFORNIA MONEY
                                       MARKET PORTFOLIO


                                       SEMI-ANNUAL
                                       REPORT
                                       JUNE 30, 1996

                                    [LOGO]
<PAGE>
 
                           CALVERT TAX-FREE RESERVES
                       CALIFORNIA MONEY MARKET PORTFOLIO

Dear Investor:

     Interest rates moved a bit higher during the first six months of 1996. The
nation's economy continued to expand slowly, with Gross Domestic Product
increasing by an annualized 2.5%, but investors feared that stronger growth and
possibly higher inflation were on the horizon.

                               MUNICIPAL RATES 

                             [GRAPH APPEARS HERE]

Graph shows Municipal Rates for 1, 7 and 20 year AA general obligations between 
6/95 and 6/96




     The rise in rates did         
not stall the stock market's                   
advance. The Standard &                                                         
Poor's 500 Stock Index, a                                 
grouping of mostly large-                                                       
company stocks, turned in                                                       
a six-month gain of 10.10%.                                                     
                                                                                
     In general, money                                                          
market yields were slightly                                                     
below their levels of six                                                       
months ago. Intermediate-                                                   
and longer-term fixed-
income investments 
suffered more in response to the rise in rates and, on average, reported flat to
negative year-to-date returns.

Fund Performance and Strategy Review

     Yields on municipal money market securities trended a bit higher early in
1996, but fell back in April and May to close the period about where they began.
Municipal money market yields were not able to keep pace with those of taxable
money market securities 
because money managers                 COMPOUND DIVIDEND YIELD
looking to reduce the 
interest rate sensitivity                [GRAPH APPEARS HERE]
of their municipal 
portfolios increased their                                           1.82% 
holdings of these                                            
very short-term securities.                                      1.61%
The stronger demand kept a 
lid on yields. In the                                            1.60% 
taxable fixed-income market,                             
this level of activity                                      1.42%
would be insignificant      
because of the                   0.0%     0.5%     1.0%     1.5%     2.0% 



SEMI-ANNUAL REPORT (UNAUDITED)                  CTFR-CA MONEY MARKET PORTFOLIO-1

<PAGE>
 
greater supply of money market securities. But the supply of municipal money
market securities is much thinner, therefore demand factors have more of an
impact on yields.

     The California Money Market Portfolio's yield on June 30, 1996 was slightly
below its level at the close of 1995 due to continued low interest rates, but it
remained above the yield on an average of similar funds.

     The Portfolio's maintained a weighted average maturity of 15 days on June
30, 1996, which was little changed from its level at the beginning of this
reporting period.

Outlook
     We anticipate continued modest economic growth. Gross Domestic Product will
likely continue to expand at an annualized rate of 2.5% or a bit higher for the
remainder of the year. This could be slightly above the Federal Reserve's target
growth rate, but not so much so that we would expect rates to move dramatically
higher.

     Radical suggestions for tax reform had been hurting the municipal market
and these now appear to have been put on the sidelines. And, since the close of
this reporting period, investors in stocks have encountered significantly
greater volatility. A riskier stock market could enhance the appeal of bond and
money market securities.

     In our view the municipal market is now fairly valued, and our outlook for
the balance of 1996 is positive. Investors in the California Money Market
Portfolio are not likely to be rewarded with soaring yields, however the
Portfolio remains an ideal choice for those looking to generate tax-free income
and maintain a stable principal value.

Sincerely,


/s/ David Rochat
- ----------------
David Rochat
Senior Vice President
July 31, 1996



2 - CTRF-CA MONEY MARKET PORTFOLIO               SEMI-ANNUAL REPORT (UNAUDITED) 
<PAGE>

                             




                               RATINGS BREAKDOWN



                             [CHART APPEARS HERE]

                      
                    First Tier                 Second Tier
                        92%                         8%




 
All securities in Calvert Group money market funds are eligible securities under
rule 2a-7 of the Investment Company Act of 1940. First Tier Securities are
eligible securities rated in the highest rating category for short-term debt
obligations by at least two of the Nationally Recognized Statistical Ratings
Organizations. Second Tier Securities are eligible securities not in the First
Tier.


SEMI-ANNUAL REPORT (UNAUDITED)                 CTFR--CA MONEY MARKET PORTFOLIO-3
<PAGE>
 
                              Portfolio Statistics

                               Maturity Schedule
<TABLE>
<CAPTION>
 
<S>                                                          <C>         <C>
                                                             12/31/95    6/30/96
- --------------------------------------------------------------------------------
1-60 Days                                                        94%         96%
61-120 Days                                                       5%          --
121-180 Days                                                      1%          1%
181-360 Days                                                      --          3%
Weighted Average                                             14 days     15 days
 
</TABLE>

<TABLE> 
<CAPTION> 

                          Average Annual Total Returns
                           for periods ended 6/30/96
         <S>                                                      <C>          
         One Year                                                 3.45%
         Five Year                                                3.12%
         Since Inception (10/89)                                  3.79%
</TABLE> 

                            Hypothetical Performance
             Change in value of a hypothetical $10,000 investment.

<TABLE> 
<CAPTION> 
                             [GRAPH APPEARS HERE]

<S>             <C>        <C>        <C>        <C>        <C>        <C>        <C>       <C> 
                6/30/96    6/30/95    6/30/94    6/30/93    6/30/92    6/30/91    6/30/90   10/16/89      
                -------    -------    -------    -------    -------    -------    -------   --------
CA TFR M.M.     $12,826    $12,397    $11,984    $11,719    $11,436    $11,000    $10,438   $10,000

</TABLE> 

Total returns assume reinvestment of dividends. Past performance is no guarantee
of future results.


4 - CTFR--CA MONEY MARKET PORTFOLIO               SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                            STATEMENT OF NET ASSETS
                                 JUNE 30, 1996
<TABLE> 
<CAPTION> 

PRINCIPAL
AMOUNT                                                                                 VALUE
===============================================================================================
                          CALIFORNIA MUNICIPAL OBLIGATIONS - 98.5%
<S>           <C>                                                                  <C> 
$ 3,550,000   Alameda-Contra Costa Revenue Anticipation Notes, 3.75%, 1/30/97,
               LOC: Sumitomo Bank, Ltd. .........................................   $ 3,559,964
  2,000,000   Auburn Unified School District Certificates of Participation VRDN,
               3.25%, 12/1/19, LOC: Union Bank of California ....................     2,000,000
  3,700,000   Barstow Multi-Family Housing Revenue VRDN, 3.75%, 4/1/18,
               C/LOC: Mercury S&L ...............................................     3,700,000
  6,800,000   California Buena Park Community Development Authority VRDN,
               5.1975%, 12/28/99, GA: Mass Mutual Life Insurance ................     6,800,000
  2,410,000   California Housing Finance Agency Revenue VRDN, 3.40%, 8/1/10,
               INSUR: MBIA ......................................................     2,410,000
    750,000   California Pollution Control Financing Authority Revenue VDRN,
               3.80%, 3/1/08, LOC: Banque National de Paris .....................       750,000
  4,825,000   California State Custodial Receipts 1992 Series A VRDN, 3.60%,
               10/1/07, INSUR: MBIA .............................................     4,825,000
 14,000,000   California Valleys Housing Finance Authority Revenue Bonds, 4.05%,
               7/1/25, LOC: Sumitomo Bank, Ltd. .................................    14,000,000
  1,100,000   Chula Vista Industrial Development Authority VRDN, 3.55%, 12/1/21,
               LOC: Union Bank of California ....................................     1,100,000
  4,650,000   City of Palmdale Community Redevelopment Agency VRDN, 5.3625%,
               12/1/05, LOC: National Bank of Canada ............................     4,650,000
  2,875,000   Commerce California Joint Powers Financing Authority VRDN, 3.30%,
               11/1/14, LOC: Bank of America ....................................     2,875,000
  1,700,000   Fairfield Industrial Development Authority VRDN, 3.30%, 4/1/12,
               LOC: Wells Fargo Bank, NA ........................................     1,700,000
  1,200,000   Fresno Multi-Family Housing VRDN, 4.50%, 5/1/15,
               LOC: Tokai Bank Ltd. .............................................     1,200,000
  3,075,000   Glendora Industrial Development Authority VRDN, 4.46%, 12/1/16,
               LOC: Union Bank of California ....................................     3,075,000
              Hemet Multi-Family Housing Authority VRDN:
  4,800,000    3.80%, 8/15/04, C/LOC: Redland S&L ...............................     4,800,000
  8,050,000    3.60%, 7/1/06, C/LOC: Mercury S&L ................................     8,050,000
  6,100,000   Irvine Public Facilities Revenue VRDN, 3.10%, 11/1/10,
               LOC: National Westminster Bank ...................................     6,100,000
              Los Angeles Community Redevelopment Agency Revenue VRDN:
  7,000,000    3.25%, 12/1/05, LOC: Industrial Bank of Japan, Ltd. ..............     7,000,000
  5,900,000    3.20%, 4/1/09, LOC: Tokai Bank Ltd. ..............................     5,900,000
  6,500,000   Los Angles Convention & Exhibition Center Revenue VRDN, 3.45%,
               8/15/18, INSUR: MBIA .............................................     6,500,000
  3,100,000   Los Angeles County Housing Authority Revenue VRDN, 3.40%,
               11/1/09, LOC: Industrial Bank of Japan, Ltd. .....................     3,100,000
  2,000,000   Los Angeles County Tax & Revenue Anticipation Notes, 4.50%, 7/1/96,
               LOC: Bank of America .............................................     2,000,000
              Los Angeles Multi-Family Housing Revenue VRDN:
  5,000,000    3.40%, 12/1/16, C/LOC: Mercury S&L ...............................     5,000,000
  8,600,000    3.75%, 8/1/19, LOC: Fuji Bank Ltd. ...............................     8,600,000
  5,525,000   Midpeninsula Regional VRDN, 4.15%, 2/1/08, LOC: Fuji Bank Ltd. ....     5,525,000
</TABLE> 

SEMI-ANNUAL REPORT (UNAUDITED)                CTFR-CA MONEY MARKET PORTFOLIO - 5

<PAGE>
 
<TABLE> 
<CAPTION> 

PRINCIPAL
AMOUNT                                                                                 VALUE
===============================================================================================
<S>           <C>                                                                  <C> 
              Oceanside Multi-Family Housing VRDN:
$ 4,600,000    3.675%, 12/1/07, C/LOC: Western Federal S&L ......................   $ 4,600,000
  6,540,000    3.50%, 8/1/17, SURBD: Continental Casualty........................     6,540,964
              Orange County Apartment Development Revenue VRDN:
  9,200,000    3.40%, 11/1/05, LOC: First Interstate Bancorp ....................     9,200,000
  7,000,000    3.40%, 11/1/05, LOC: First Interstate Bancorp ....................     7,000,000
  5,400,000    3.00%, 4/1/06, LOC: Bank of Tokyo-Mitsubishi, Ltd. ...............     5,400,000
    450,000    3.65%, 3/1/07, LOC: Tokai Bank Ltd. ..............................       450,000
  3,500,000    3.35%, 10/1/07, LOC: Bank of Tokyo-Mitsubishi, Ltd. ..............     3,500,000
    600,000    3.00%, 11/1/08, LOC: Bank of Tokyo-Mitsubishi, Ltd. ..............       600,000
  7,400,000    3.45%, 11/1/08, LOC: Banque Paribas ..............................     7,400,000
  2,500,000    4.25%, 11/1/08, LOC: Tokai Bank Ltd. .............................     2,500,000
  5,800,000    4.35%, 11/1/09, LOC: Tokai Bank Ltd. .............................     5,800,000
  5,530,000    3,80%, 12/1/16, LOC: Bank of Tokyo-Mitsubishi, Ltd. ..............     5,530,000
    500,000   Orange County Certificates of Participation, Florence Crittendon
               Services VRDN, 3.30%, 3/1/16, LOC: Swiss Bank Corp. ..............       500,000
  9,000,000   Orange County Housing Authority Revenue VRDN, 3.40%, 12/1/07,
               LOC: Bank of Tokyo-Mitsubishi, Ltd. ..............................     9,000,000
              Palmdale School District Project Lease VRDN:
  5,444,086    3.60%, 12/13/10, LOC: National Westminster Bank ..................     5,444,086
  1,807,143    3.60%, 12/13/10, LOC: National Westminster Bank ..................     1,807,143
 11,000,000   Pitney Bowes Credit Corporation Lease TOPS Trust Certificates,
               3.70%, 4/1/98, BPA: Pitney Bowes Credit Corporation ..............    11,000,000
              Riverside Multi-Family Housing VRDN:
  5,890,000    3.425%, 12/1/05, LOC: Household Federal Savings ..................     5,890,000
  1,000,000    4.25%, 6/1/09, LOC: Tokai Bank Ltd. ..............................     1,000,000
  6,635,000    3.50%, 12/1/16, LOC: Tokai Bank Ltd. .............................     6,635,000
  4,050,000   Salinas Multi-Family Housing VRDN, 3.925%, 12/1/16,
               C/LOC: Mercury S&L ...............................................     4,050,000
  5,000,000   San Bernardino Multi-Family Housing Revenue VRDN, 5.58%, 5/1/15 ...     5,000,000
              San Bernardino Public Safety Authority Revenue Bonds:
  2,100,000    3.90%, 11/1/96 ...................................................     2,100,000
  2,400,000    4.10%, 5/1/97 ....................................................     2,400,000
              San Diego Multi-Family Housing VRDN:
  4,000,000    3.55%, 6/1/07, C/LOC: Mercury S&L ................................     4,000,000
  1,100,000    6,00%, 12/1/08, LOC: Daiwa Bank, Ltd. ............................     1,100,000
  4,000,000    2.90%, 2/1/09, LOC: Citibank .....................................     4,000,000
  5,000,000    3.50%, 8/1/15, LOC: Bank of Tokyo-Mitsubishi, Ltd. ...............     5,000,000
  2,700,000   San Diego Sewer Revenue VRDN, 3.50%, 5/15/20, INSUR: AMBAC ........     2,700,000
              San Francisco Multi-Family Housing VRDN:
  5,000,000    4.05%, 10/1/00, LOC: Mitsubishi Trust & Banking ..................     5,000,000
  8,000,000    3.40%, 12/1/05, LOC: Industrial Bank of Japan, Ltd. ..............     8,000,000
  3,500,000   San Marcos Industrial Development Authority VRDN, 3.83%, 12/1/20,
               LOC: Bank of California ..........................................     3,500,000
  1,900,000   San Marcos Redevelopment VRDN, 4.21%, 12/1/10,
               LOC: Bank of America .............................................     1,900,000
  4,033,000   Santa Ana Industrial Development VRDN, 3.40%, 10/1/15,
               LOC: Tokai Bank Ltd. .............................................     4,033,000
  1,500,000   Santa Ana Multi-Family Housing VRDN, 3.50%, 12/1/07,
               C/LOC: Mercury S&L ...............................................     1,500,000
</TABLE> 

6-CTFR--CA MONEY MARKET PORTFOLIO                 SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
<TABLE> 
<CAPTION> 

PRINCIPAL
AMOUNT                                                                   VALUE
==============================================================================  
<S>          <C>                                                    <C> 
$ 3,000,000  Santa Ana Unified School District Certificates of
               Participation VRDN, 3.10%, 7/1/15, LOC: Banque
               National de Paris.................................  $  3,000,000

  7,000,000  Santa Paula Public Financing Authority Revenue
               VRDN, 3.75%, 2/1/26, LOC: Sumitomo Trust &
               Banking...........................................     7,000,000

  3,000,000  Southeast Resource Recovery Facility Authority
               Lease Revenue Bonds, 3.45%, 12/1/18, LOC: Industrial
               Bank of Japan, Ltd................................     3,000,000

  2,500,000  Stockton County Multi-Family Housing VRDN, 3.10%,
               9/1/18, LOC: Bank of America......................     2,500,000

  2,740,000  Stockton County Nursing Home VRDN, 4.46%, 12/1/16,
               LOC: Union Bank of California.....................     2,740,000

  1,360,000  Stockton Heritage Convalescent Center Project VRDN,
               5.775% 12/1/05, LOC: Tokai Bank Ltd...............     1,360,000

  8,000,000  Union City Housing Mortgage Revenue VRDN, 4.05%,
               10/1/11, LOC: Mitsubishi Trust & Banking..........     8,000,000

  5,000,000  Union City Multi-Family Housing Authority Revenue
               VRDN, 3.20%, 10/1/07, LOC: Sumitomo Trust &
               Banking...........................................     5,000,000

 16,000,000  Victor Valley Community College Revenue VRDN,
               3.45%, 11/1/24, GA: Anchor National Life..........    16,000,000

  6,300,000  Victor Valley Community College Certificates of
               Participation VRDN, 3.15%, 8/01/26, LOC: Banque
               National de Paris.................................     6,300,000

  3,830,000  Victorville Multi-Family Housing Revenue VRDN,
               3.90%, 12/1/15, C/LOC: Redlands S&L...............     3,830,000

  2,600,000  West Sacramento Financing Authority Special
               Tax Revenue VRDN, 3.50%, 8/01/21, LOC: Wells
               Fargo Bank, NA....................................     2,600,000
                                                                   ------------
             TOTAL INVESTMENTS (Cost $330,629,193) -
             98.5%...............................................   330,629,193
             Other assets and liabilities, net - 1.5%............     4,882,983
                                                                   ------------
             NET ASSETS - 100%...................................  $335,512,176
                                                                   ============

NET ASSETS CONSIST OF:
==============================================================================
Paid in capital applicable to 335,690,365 shares of beneficial
 interest, unlimited number of no par shares authorized..........  $335,690,406
Undistributed net investment income..............................       (34,497)
Accumulated realized gain/(loss) on investments..................      (143,733)
                                                                   ------------
              NET ASSETS.........................................  $335,512,176
                                                                   ============

              NET ASSET VALUE PER SHARE..........................  $       1.00
                                                                   ============
</TABLE> 
                                                                  
Explanation of Guarantees:
BPA: Bond-Purchase Agreement
GA: Guaranty Agreement
INSUR: Insurance
LOC: Letter of Credit
C/LOC: Collaterized LOC
SURBD: Surety Bond

Abbreviations:
VRDN: Variable Rate Demand Note

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)         CTFR-CA MONEY MARKET PORTFOLIO - 7

<PAGE>

                           STATEMENT OF OPERATIONS 
                        SIX MONTHS ENDED JUNE 30, 1996

<TABLE>
<CAPTION>

NET INVESTMENT INCOME
- -------------------------------------------------------------------------------
Investment Income
<S>                                                                 <C>
  Interest income................................................... $6,465,805
                                                                     ----------
Expenses
  Investment advisory fee...........................................    826,690
  Transfer agency fees and expenses.................................    247,827
  Trustees' fees and expenses.......................................     13,480
  Administrative fees...............................................     11,834
  Custodian fees....................................................     12,499
  Registration fees.................................................      6,855
  Reports to shareholders...........................................     74,184
  Professional fees.................................................     13,295
  Miscellaneous.....................................................     23,339
  Reimbursement from Advisor........................................    (31,438)
                                                                     ----------
    Total expenses..................................................  1,198,565
    Fees paid indirectly............................................    (12,499)
                                                                     ----------
      Net expenses..................................................  1,186,066
                                                                     ----------
        NET INVESTMENT INCOME.......................................  5,279,739
                                                                     ----------
 
REALIZED GAIN (LOSS) ON INVESTMENTS
- -------------------------------------------------------------------------------
Net realized gain (loss)............................................       (351)
                                                                     ----------
 
      INCREASE (DECREASE) IN NET ASSETS
      RESULTING FROM OPERATIONS..................................... $5,279,388
                                                                     ==========
</TABLE>


See notes to financial statements.

8 - CTFR--CA MONEY MARKET PORTFOLIO              SEMI-ANNUAL REPORT (UNAUDITED) 
<PAGE>
 
                      STATEMENTS OF CHANGES IN NET ASSETS

<TABLE> 
<CAPTION> 

                                                                              Six Months       Year Ended
                                                                                Ended         December 31,
INCREASE (DECREASE) IN NET ASSETS                                           June 30, 1996         1995
- -------------------------------------------------------------------------------------------------------------
<S>                                                                        <C>               <C>  
Operations
  Net investment income................................................     $  5,279,739      $ 10,530,697
  Net realized gain (loss) on securities...............................             (351)         (143,382)
  Net realized gain (loss) on Tender Option Agreement - Note B.........               --          (600,000)
  Change in unrealized appreciation or depreciation....................               --           600,000
                                                                            ------------      ------------ 
      INCREASE (DECREASE) IN NET ASSETS
      RESULTING FROM OPERATIONS........................................        5,279,388        10,387,315
                                                                            ------------      ------------
Distributions to shareholders from
  Net investment income................................................       (5,264,127)      (10,583,766)
                                                                            ------------      ------------
Capital share transactions
  Shares sold..........................................................      247,120,658       377,023,687
  Reinvestment of distributions........................................        5,083,764        10,452,688
  Shares redeemed......................................................     (217,058,508)     (347,647,512)
                                                                            ------------      ------------
     Total capital share transactions..................................       35,145,914        39,828,863
                                                                            ------------      ------------

TOTAL INCREASE (DECREASE) IN NET ASSETS................................       35,161,175        39,632,412

NET ASSETS
- -------------------------------------------------------------------------------------------------------------
Beginning of period....................................................      300,351,001       260,718,589
                                                                            ------------      ------------
End of period (including undistributed net investment income (loss)
  of ($34,497) and ($50,109), respectively)............................     $335,512,176      $300,351,001
                                                                            ============      ============

SHARE ACTIVITY
- -------------------------------------------------------------------------------------------------------------
Shares sold............................................................      247,120,658       377,023,687
Reinvestment of distributions..........................................        5,083,764        10,452,688
Shares redeemed........................................................     (217,058,508)     (347,647,512)
                                                                            ------------      ------------
  Net share activity...................................................       35,145,914        39,828,863
                                                                            ============      ============
</TABLE> 

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)               CTFR--CA MONEY MARKET PORTFOLIO-9
<PAGE>
 
                         NOTES TO FINANCIAL STATEMENTS

NOTE A-SIGNIFICANT ACCOUNTING POLICIES

GENERAL: The California Money Market Portfolio (the "Portfolio"), a series of
Calvert Tax-Free Reserves (the "Fund"), is registered under the Investment
Company Act of 1940 as a diversified, open-end management investment company.
The operations of each series are accounted for separately. The Portfolio offers
shares of beneficial interest to the public with no sales charges.

SECURITY VALUATION: Securities are valued at amortized cost which approximates
market.

SECURITY TRANSACTIONS AND INVESTMENT INCOME: Security transactions are accounted
for on trade date. Realized gains and losses are recorded on an identified cost
basis. Interest income, accretion of discount and amortization of premium are
recorded on an accrual basis.

DISTRIBUTIONS TO SHAREHOLDERS: Distributions to shareholders are recorded by the
Portfolio on ex-dividend date. Dividends from net investment income are earned
daily and paid monthly. Distributions from net realized capital gains, if any,
are paid at least annually. Distributions are determined in accordance with
income tax regulations which may differ from generally accepted accounting
principles, accordingly, periodic reclassifications are made within the
Portfolio's capital accounts to reflect income and gains available for
distribution under income tax regulations.

EXPENSE OFFSET ARRANGEMENTS: The Portfolio has an arrangement with its custodian
bank whereby the custodian's fees are paid indirectly by credits earned on the
Portfolios' cash on deposit with the bank. Such deposit arrangement is an
alternative to overnight investments.

FEDERAL INCOME TAXES: No provision for federal income or excise tax is required
since the Portfolio intends to continue to qualify as a regulated investment
company under the Internal Revenue Code and to distribute substantially all of
its earnings.

NOTE B-RELATED PARTY TRANSACTIONS

Calvert Asset Management Company, Inc. (the "Advisor") is wholly-owned by
Calvert Group, Ltd. ("Calvert"), which is indirectly wholly-owned by Acacia
Mutual Life Insurance Company. The Advisor provides investment advisory services
and pays the salaries and fees of officers and affiliated Trustees of the Fund.
For its services, the Advisor receives a monthly fee based on the following
annual rates of average daily net assets: .50% on the first $500 million, .45%
on the next $500 million and .40% on the excess of $1 billion.

On December 15, 1994, the Portfolio entered into a Tender Option Agreement with
the Advisor valued at $600,000 to secure payment of an "at risk" investment. On
June 30, 1995 the investment paid the Portfolio in full and the Option expired
unused. The expiration loss was applied against the Advisor's capital
contribution of the Option.


10 - CTRF--CA MONEY MARKET PORTFOLIO              SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
Calvert Administrative Services Company, an affiliate of the Advisor, provides
administrative services to the Fund for an annual fee, payable monthly, of
$200,000 which is allocated to all of the Portfolios of the Fund based on their
relative net assets.

Calvert Distributors, Inc., an affiliate of the Advisor, is the distributor and
principal underwriter for the Portfolio.

Calvert Shareholder Services, Inc., an affiliate of the Advisor, acts as
transfer, dividend disbursing and shareholder servicing agent for the Fund.

Each Trustee who is not affiliated with the Advisor receives an annual fee of
$20,250 plus up to $1,200 for each Board and Committee meeting attended.
Trustee's fees are allocated to each of the funds served.

NOTE C-INVESTMENT ACTIVITY

The cost of investments owned at June 30, 1996 was substantially the same for
federal income tax and financial reporting purposes. Net realized capital loss
carryforwards, for federal income tax purposes, of $143,382 at December 31, 1995
may be utilized to offset current and future capital gains until expiration
through 2003.

As a cash management practice, the Portfolio may sell or purchase short-term
variable rate demand notes from other Portfolios managed by the Advisor. The
transactions are effected at par with no gain or loss to the Portfolio, in
accordance with its policies.


SEMI-ANNUAL REPORT (UNAUDITED)              CTFR--CA MONEY MARKET PORTFOLIO - 11
<PAGE>
 
                             FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                                  PERIODS ENDED 
                                        --------------------------------------
                                        JUNE 30,          DECEMBER 31,
                                          1996          1995        1994
- ------------------------------------------------------------------------------
<S>                                     <C>           <C>           <C>
Net asset value, beginning............  $   1.00      $   1.00      $   1.00
                                        ========      ========      ========    
Income from investment operations                                
- ---------------------------------                                
  Net investment income...............      .016          .037          .026
                                        --------      --------      --------   
Distributions from                                               
- ------------------                                               
  Net investment income...............     (.016)        (.037)        (.026)
                                        --------      --------      --------   
Net asset value, ending...............  $   1.00      $   1.00      $   1.00
                                        ========      ========      ========    
Total return/\........................      1.60%         3.78%*        2.62%*
                                        ========      ========      ========    
Ratios to average net assets:                                    
                                                                 
  Net investment income...............      3.19%(a)      3.69%         2.55%
                                        ========      ========      ========    
  Total expenses+.....................       .72%(a)       .76%           --
                                        ========      ========      ========    
  Net expenses........................       .72%(a)       .75%          .69%
                                        ========      ========      ========    
  Expenses reimbursed.................       .02%(a)        --            --
                                        ========      ========      ========   
Net assets, ending (in thousands).....  $335,512      $300,351      $260,719
                                        ========      ========      ========    
Number of shares outstanding, ending                             
  (in thousands)......................   335,690       300,544       260,716
                                        ========      ========      ========    
</TABLE> 

<TABLE> 
<CAPTION> 
                                                      YEARS ENDED 
                                        ---------------------------------------
                                                      DECEMBER 31,
                                           1993           1992          1991
- -------------------------------------------------------------------------------
<S>                                     <C>            <C>           <C>  
Net asset value, beginning............  $   1.00       $   1.00      $   1.00
                                        ========       ========      ========
Income from investment operations 
- ---------------------------------
  Net investment income...............      .022           .030          .045
                                        --------       --------      --------   
Distributions from
- ------------------
  Net investment income...............     (.022)         (.030)        (.045)
                                        --------       --------      --------   
Net asset value, ending...............  $   1.00       $   1.00      $   1.00
                                        ========       ========      ========
Total return/\........................      2.26%          3.08%         4.64%
                                        ========       ========      ========
Ratios to average net assets:

  Net investment income...............      2.22%          3.01%         4.51%
                                        ========       ========      ========
  Total expenses+.....................        --             --            --
                                        ========       ========      ========
  Net expenses........................       .69%           .68%          .60%
                                        ========       ========      ========
Net assets, ending (in thousands).....  $296,984       $323,928      $287,984
                                        ========       ========      ========
Number of shares outstanding, ending
  (in thousands)......................   296,984        323,928       287,984
                                        ========       ========      ========
</TABLE>


(a)  Annualized
/\   Total return is not annualized for periods of less than one year.
*    Total return numbers do not reflect Tender Option Agreement (see Note B).
+    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.



12-CTFR--CA MONEY MARKET PORTFOLIO                SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>



 
                              To Open an Account:
                              ..................
                                  800-368-2748


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


                                  Service for
                               Existing Account:
                              ..................
                           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


                                   Web Site:
                              ..................
                      Address: http://www.calvertgroup.com


                                   Principal
                                  Underwriter:
                              ..................
                           Calvert Distributors, Inc.
                             4550 Montgomery Avenue
                                  Suite 1000N
                            Bethesda, Maryland 20814

     This report is intended to provide fund information to shareholders.
It is not authorized for distribution to prospective investors unless preceded 
                        or accompanied by a prospectus.
<PAGE>
 
INVESTING with VISION  [LOGO--CALVERT GROUP]                 BULK RATE
A member of The Acacia Group                               U.S. POSTAGE
                                                                PAID
4550 Montgomery Avenue, Suite 1000N                       Permit No. 7470
Bethesda, Maryland 20814                                   Baltimore, MD

<PAGE>
 
                                                              CALVERT

                                                              TAX-FREE

                                                              RESERVES

                                                              VERMONT

                                                              MUNICIPAL

                                                              PORTFOLIO


                                                              SEMI-ANNUAL

                                                              REPORT

                                                              JUNE 30, 1996

                            INVESTING with VISION(TM)    [LOGO OF CALVERT GROUP]
<PAGE>
 
                           CALVERT TAX-FREE RESERVES
                          VERMONT MUNICIPAL PORTFOLIO

Dear Investor:

  Interest rates moved a bit higher during the first six months of 1996. The
nation's economy continued to expand slowly, with Gross Domestic Product
increasing by an annualized 2.5%, but investors feared that stronger growth and
possibly higher inflation were on the horizon.

  The rise in rates did not stall the stock market's advance. The Standard &
Poor's 500 Stock Index, a grouping of mostly large-company stocks, turned in a
six-month gain of 10.10%.

                             [GRAPH APPEARS HERE]
               Graph shows Municipal Rates for 1, 7 and 20 year
                  AA General Obligations between 6/95 and 6/96.

  In general, short-term fixed-income investments were able to eke out slightly
positive returns for the six-months ended June 30, as higher yields more than
offset declining prices. Intermediate- and longer-term fixed-income investments
suffered more in response to the rise in rates and, on average, reported flat to
negative year-to-date returns.

  Municipal bonds outperformed Treasuries as the likelihood of radical tax
reform faded. The prospect of an overhaul of the Tax Code had been depressing
the municipal market but, with Bob Dole in place as the Republican candidate, it
became less likely that this would be a plank in either Party's campaign. Tight
supply of new issues and strong demand also helped to buoy municipal bond prices
relative to taxable securities.

FUND PERFORMANCE AND STRATEGY REVIEW

  After a protracted period of declining yields and rising prices, the municipal
bond market changed course early in this reporting period. Bond prices started
to slip in February as investors demanded higher yields to compensate for their
expectations of stronger economic growth and belief that the Federal Reserve
would shift to a tighter monetary policy.

  The Vermont Municipal Portfolio's 12-month return was positive and in line
with municipal securities' historical average annual returns. The Portfolio's
six-month return was slightly negative as the modestly higher level of interest
income was not enough to offset the decline in bond prices. For both the 
six- and 12-month periods, the Vermont Municipal Portfolio's return was above
its peer group average.

SEMI-ANNUAL REPORT (UNAUDITED)              CTFR VERMONT MUNICIPAL PORTFOLIO - 1
<PAGE>
 
  The Portfolio had an average maturity of 13 years at the close of this
reporting period, which was only slightly lower than its level at the beginning
of the year.

  The Portfolio's allocation of assets by credit quality was essentially
unchanged. Almost 65% of assets continue to be invested in securities with AAA
or AA ratings, the two highest credit categories, according to Moody's Investors
Service.


                            INVESTMENT PERFORMANCE
<TABLE> 
<CAPTION>
               Periods Ended 6/30/96   6 Months       12 Months
               ------------------------------------------------
<S>                                    <C>            <C> 

               Vermont Municipal
                Portfolio               -.58%          6.21%      

               Lipper Other States
                Muni Fund Avg.          -.99%          5.88%                   

                Investment performance is for Class A shares and does
                not reflect the deduction of any front-end sales charge.
</TABLE> 
 
OUTLOOK

  We anticipate continued modest economic growth. Gross Domestic Product will
likely continue to expand at an annualized rate of 2.5% or a bit higher for the
remainder of the year. This could be slightly above the Federal Reserve's target
growth rate, but not so much so that we would expect rates to move dramatically
higher.

  As we mentioned earlier, radical suggestions for tax reform had been hurting
the municipal market and these now appear to have been put on the sidelines.
And, since the close of this reporting period, investors in stocks have
encountered significantly greater volatility. A riskier stock market could
enhance the appeal of fixed-income securities.

  In our view the municipal market is now fairly valued, and our outlook for the
balance of 1996 is positive.

  We appreciate your investment in the Calvert Vermont Municipal Portfolio.

Sincerely,



/s/ David Rochat
David Rochat
Senior Vice President
July 31, 1996

2-CTFR VERMONT MUNICIPAL PORTFOLIO                SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                Important Notice To Investors in Class C Shares

     On or about October 28, 1996, all outstanding Class C accounts in the
Calvert Vermont Municipal Portfolio will be converted into an equal dollar
amount of Class A shares. The shares will be converted at net asset value with
no sales charge. This exchange will have a positive impact on your return, since
Class A shares have a lower expense ratio than Class C shares.
     You do not need to take any action. The conversion will take place
automatically. The conversion will be a non-taxable event, meaning you should
not incur any taxes as a result.
     No new Class C accounts may be opened after August 23, 1996. Owners of
Class C accounts opened on or before that date may continue to purchase Class C
shares for existing Class C accounts until the date of conversion.


                               Ratings Breakdown

<TABLE> 
<CAPTION> 
                             [GRAPH APPEARS HERE]

                   AAA/Aaa    AA/Aa    A/a    BBB/Baa    NR
                   <S>        <C>      <C>    <C>        <C> 
                     40%       24%     16%      12%      8%
</TABLE> 
 

   NR: Obligation is not rated by a commercial credit rating service, such as 
Moody's Investors Services, Inc., or Standard & Poor's Corporation; obligation 
has been determined to be of appropriate quality for the Portfolio by Calvert 
Asset Management Company, Inc., the Investment Advisor.


SEMI-ANNUAL REPORT (UNAUDITED)              CTFR VERMONT MUNICIPAL PORTFOLIO - 3



<PAGE>

<TABLE> 
<CAPTION> 

                             PORTFOLIO STATISTICS

                           WEIGHTED AVERAGE MATURITY
                              12/31/95      6/30/96
                              ---------------------
                              14 years     13 years   


                                  SEC YIELDS

                                                           Class A      Class C
Thirty Days Ended                                          6/30/96      6/30/96
- -------------------------------------------------------------------------------
<S>                                                        <C>          <C> 
                                                           4.93%        3.15%
Yields assume reinvestment of dividends.
</TABLE> 

<TABLE> 
<CAPTION> 
                         AVERAGE ANNUAL TOTAL RETURNS
                          for periods ended 6/30/96
         <S>                                        <C> 
         Class A Shares

         One Year                                   2.20%

         Since Inception (4/91)                     6.30%

         
         Class C Shares

         One Year                                   4.07%

         Since Inception (3/94)                     2.96%

</TABLE> 

                            PERFORMANCE COMPARISON
      Comparison of change in value of a hypothetical $10,000 investment.

                             [CHART APPEARS HERE]

<TABLE> 
<CAPTION> 
                             6/30/96    6/30/95    6/30/94    6/30/93    6/30/92    6/30/91    4/1/91
                             -------    -------    -------    -------    -------    -------    ------
<S>                          <C>        <C>        <C>        <C>        <C>        <C>        <C> 
CTFR VERMONT                 $13,768    $12,963    $12,019    $11,961    $10,817    $ 9,823    $ 9,625

LEHMAN MUNICIPAL BD          $15,190    $14,464    $12,851    $13,020    $11,648    $10,214    $10,000
</TABLE> 

Total returns assume reinvestment of dividends and, for Class A shares, reflect
the deduction of the fund's maximum sales charge of 3.75%. No sales charge has
been applied to the index used for comparison. The value of an investment in
Class A shares is plotted in the line graph. The value of an investment in Class
C shares would be different. Past performance is no guarantee of future returns.


4 - CTFR VERMONT MUNICIPAL PORTFOLIO              SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>

                            STATEMENT OF NET ASSETS
                                 JUNE 30, 1996

<TABLE>
<CAPTION>
  
Principal
Amount                                                                                       Value
- ------------------------------------------------------------------------------------------------------
                                 Vermont Municipal Obligations - 97.6%
<S>              <C>                                                                      <C>
 $2,000,000      Burlington Electric Revenue Bonds, 6.25%, 7/1/14, MBIA Insured......     $2,050,560
                 Burlington Public Improvement General Obligation Bonds:
    265,000        6.40%, 5/1/01.....................................................        276,331
    700,000        6.50%, 5/1/02.....................................................        729,883
    100,000        6.50%, 5/1/04.....................................................        103,759
    220,000        6.50%, 5/1/06.....................................................        227,095
  2,000,000      Chittenden Unlimited Tax General Obligation Bonds, 6.60%,
                   1/1/12 Asset Guaranty Insured.....................................      2,084,440
                 Rutland County Solid Waste General Obligation Bonds:
    110,000        5.80%, 11/1/99....................................................        113,420
    110,000        5.95%, 11/1/00....................................................        114,329
    110,000        6.10%, 11/1/01....................................................        115,339
    110,000        6.25%, 11/1/02....................................................        116,405
    110,000        6.35%, 11/1/03....................................................        117,077
    110,000        6.45%, 11/1/04....................................................        117,818
    105,000        6.50%, 11/1/05....................................................        112,740
    100,000        6.55%, 11/1/06....................................................        107,535
    100,000        6.60%, 11/1/07....................................................        107,606
    100,000        6.70%, 11/1/08....................................................        108,028
    100,000        6.75%, 11/1/09....................................................        107,956
    100,000        6.80%, 11/1/10....................................................        108,315
    100,000        6.80%, 11/1/11....................................................        108,149
    100,000        6.85%, 11/1/12....................................................        108,437
  1,800,000      Vermont Education and Health - Central Vermont Hospital,
                   7.00%, 10/1/22....................................................      2,018,700
  2,000,000      Vermont Education and Health - Central Vermont Hospital,
                   5.00%, 11/15/15, AMBAC Insured....................................      1,783,040
  1,000,000      Vermont Education and Healthy - Lyndon Institute Project,
                   6.60%, 12/1/14....................................................        972,970
  2,095,000      Vermont Education and Health - Middlebury College,
                   6.00%, 11/1/13....................................................      2,109,686
  2,000,000      Vermont Education and Health - Northwestern Medical Center,
                   6.25%, 9/1/18.....................................................      1,887,800
    580,000      Vermont Education and Health - Norwich University,
                   5.75%, 9/1/05.....................................................        594,065
  1,500,000      Vermont Education and Health - Norwich University,
                   6.00%, 9/1/13.....................................................      1,459,155
  1,000,000      Vermont Education and Health - Southwestern Vermont Medical
                   Center, 5.625%, 5/1/25, FSA Insured...............................        949,800
  1,085,000      Vermont Education and Health - St. Johnsbury Academy,
                   7.30%, 4/15/18....................................................      1,159,659
                 Vermont Education and Health - St. Michael's College:
     50,000        7.40%, 6/1/99.....................................................         53,283
    125,000        7.80%, 6/1/02.....................................................        133,066
  2,000,000        7.05%, 10/1/16....................................................      2,182,740
</TABLE> 

SEMI-ANUAL REPORT (UNAUDITED)       CTFR VERMONT MUNICIPAL PORTFOLIO - 5
<PAGE>

<TABLE> 
<CAPTION> 
 
Principal
Amount                                                                  Value
- -------------------------------------------------------------------------------
<S>         <C>                                                      <C>   
 $750,000   Vermont Education and Health - Vermont Medical Center 
              Bonds, 6.00%, 9/1/22, FGIC Insured.....................  $749,925 
   65,000   Vermont Housing Finance Authority Home Mortgage Purchase 
              Series A Bonds, 7.25%, 12/1/00.........................    67,518
  175,000   Vermont Housing Finance Authority Single Family Series 1 
              Housing Bonds, 8.15%, 5/1/25...........................   184,226
1,200,000   Vermont Housing Finance Authority Single Family Series 2 
              Housing Bonds, 7.20%, 11/1/11.......................... 1,235,532
1,250,000   Vermont Industrial Development Authority Revenue Bonds,  
              5.775%, 12/1/01, Letter of Credit: Vermont National    
              Bank................................................... 1,250,000
            Vermont Municipal Bond Bank Revenue Bonds:               
  130,000     Series 1, 7.35%, 12/1/97...............................   135,803
  420,000     Series 1, 6.60%, 12/1/98...............................   441,508
  130,000     Series 1, 7.35%, 12/1/98...............................   138,363
1,000,000     Series 1, 5.375%, 12/1/13..............................   965,420
1,500,000     Series 1, 6.875%, 12/1/22.............................. 1,665,675
  200,000     Series 2, 6.50%, 12/1/98...............................   209,786
  500,000     Series 2, 7.10%, 12/1/99 (Prerefunded 12/1/98  @ 102)..   541,395
  500,000     Series 2, 6.60%, 12/1/00...............................   539,230
  750,000     Series B, 7.25%, 12/1/98...............................   774,188
  190,000   Vermont Public Power Supply Authority Bonds,  6.50%,     
              7/1/99, AMBAC Insured..................................   195,884
1,000,000   Vermont State College Revenue Bonds, 8.00%, 7/1/18,      
              (Prerefunded 7/1/99 @ 102)............................. 1,114,640
1,360,000   Vermont State College Revenue Bonds, 5.125%, 7/1/18, MBIA
              Insured................................................ 1,245,107
            Vermont State General Obligation Bonds:                  
1,500,000     5.70%, 1/15/00......................................... 1,554,390
1,740,000     6.50%, 2/1/01.......................................... 1,868,656
2,500,000     6.30%, 1/15/06......................................... 2,707,550
  500,000     6.50%, 2/1/07, (Prerefunded 2/1/01 @ 102)..............   544,185
1,000,000     6.40%, 2/1/08.......................................... 1,090,880
  400,000     Zero Coupon,  8/1/08...................................   202,492
  300,000     Zero Coupon, 8/1/09....................................   141,741
1,000,000     4.90%, 2/1/10..........................................   924,980
1,000,000     6.45%, 2/1/11.......................................... 1,093,300
1,950,000     6.45%, 2/1/12.......................................... 2,131,935
2,440,000   Vermont State Lease Certificates of Participation,       
              6.50%, 7/1/11, MBIA Insured............................ 2,561,512
2,000,000   Vermont Student Assistance Corporation Education Loan    
              Series A Revenue Bonds, 6.50%, 6/15/00, AMBAC Insured.. 2,092,740
2,240,000   Vermont Student Assistance Corporation Education Loan    
              Series A-3 Revenue Bonds, 6.50%, 12/15/05, FSA Insured. 2,381,344
1,000,000   Vermont Student Assistance Corporation Education Loan    
              Series B Revenue Bonds, 6.70%, 12/15/12, FSA Insured... 1,036,490
  400,000   Windham County Solid Waste General Obligation Bonds,     
              6.40%, 12/1/97.........................................   399,768
                                                                    -----------
            TOTAL INVESTMENTS (Cost $52,305,599) - 97.6%.............54,525,349
            Other assets and liabilities, net - 2.4%................. 1,328,861
                                                                    -----------
            Net Assets - 100%.......................................$55,854,210
                                                                    ===========
</TABLE>
 
6-CTFR VERMONT MUNICIPAL PORTFOLIO               SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>

<TABLE> 
<CAPTION> 
 
Net Assets Consist of:                                  Value
- ------------------------------------------------------------------
<S>                                                    <C> 
 Paid-in capital applicable to the following shares
  of beneficial interest, unlimited number of no par 
  shares authorized:
    Class A: 3,442,015 shares outstanding............  $53,123,592
    Class C: 27,245 shares outstanding...............      429,420
 Undistributed net investment income.................      208,717
 Accumulated net realized gain (loss) on investments.     (127,269)
 Net unrealized appreciation (depreciation) on
  investments........................................    2,219,750
                                                       -----------
   Net assets........................................  $55,854,210
                                                       ===========
 
Net Asset Value per Share
- ------------------------------------------------------------------
Class A (based on net assets of $55,421,339).........       $16.10
                                                       ===========
Class C (based on net assets of $432,871)............       $15.89
                                                       ===========
</TABLE>


Abbreviations:
AMBAC - AMBAC Indemnity Corporation
FGIC - Financial Guaranty Insurance Company
FSA - Financial Security Assurance
MBIA - MBIA Insurance Corporation

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)        CTFR VERMONT MUNICIPAL PORTFOLIO - 7
<PAGE>
                            STATEMENT OF OPERATIONS
                        SIX MONTHS ENDED JUNE 30, 1996

 <TABLE>
<CAPTION>
Net Investment Income
- --------------------------------------------------------------------------------
Investment Income
<S>                                                                 <C>
   Interest income..............................................    $ 1,742,811
                                                                    -----------
Expenses
   Investment advisory fee......................................        173,473
   Transfer agency fees and expenses............................         13,187
   Distribution plan expenses of Class C........................          2,237
   Trustees' fees and expenses..................................          2,493
   Administrative fees..........................................          2,069
   Custodian fees...............................................         10,120
   Registration fees............................................          4,112
   Reports to shareholders......................................         12,240
   Professional fees............................................          2,911
   Miscellaneous................................................          9,464
                                                                    ----------- 
      Total expenses............................................        232,306
      Fees paid indirectly......................................        (10,120)
                                                                    -----------
         Net expenses...........................................        222,186
                                                                    -----------
            Net Investment Income...............................      1,520,625
                                                                    -----------
Realized and Unrealized Gain (Loss)
on Investments
- --------------------------------------------------------------------------------
Net realized gain (loss) on:
   Securities...................................................        (20,247)
   Futures......................................................       (161,144)
                                                                    ----------- 
                                                                       (181,391)

Change in unrealized appreciation or depreciation...............     (1,718,846)
                                                                    -----------
            Net Realized and Unrealized Gain (Loss)
            on Investments......................................     (1,900,237)
                                                                    -----------
            Increase (Decrease) in Net Assets
            Resulting From Operations...........................       (379,612)
                                                                    ===========
</TABLE>
See notes to financial statement.

8 - CTFR VERMONT MUNICIPAL PORTFOLIO              SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>

STATEMENT OF CHANGES IN NET ASSETS

<TABLE> 
<CAPTION>
                                                                   Six Months 
                                                                      Ended       Year Ended
INCREASE (DECREASE) IN NET ASSETS                                 June 30, 1996  Dec. 31, 1995
- ----------------------------------------------------------------------------------------------
<S>                                                                 <C>           <C>
Operations
 Net investment income............................................  $ 1,520,625   $  3,335,609
 Net realized gain (loss).........................................     (181,391)       829,370
 Change in unrealized appreciation or depreciation................   (1,718,846)     4,506,456
                                                                    -----------   ------------
  INCREASE (DECREASE) IN NET ASSETS
  RESULTING FROM OPERATIONS.......................................     (379,612)     8,671,435
                                                                    -----------   ------------
Distributions to shareholders from
  Net investment income:
   Class A shares.................................................   (1,489,144)    (3,270,290)
   Class C shares.................................................       (7,669)       (18,419)
 Net realized gain:
   Class A shares.................................................            -       (336,995)
   Class C shares.................................................            -         (2,227)
                                                                    -----------   ------------
 Total distributions..............................................   (1,496,813)    (3,627,931)
                                                                    -----------   ------------
Capital share transactions
 Shares sold:
   Class A shares.................................................    2,437,671      4,860,473
   Class C shares.................................................      251,341        430,193
 Reinvestment of distributions:
   Class A shares.................................................      648,393      2,192,127
   Class C shares.................................................        7,581         19,158
 Shares redeemed:
   Class A shares.................................................   (6,006,687)   (16,079,754)
   Class C shares.................................................     (205,371)      (306,328)
                                                                    -----------   ------------

 Total capital share transactions.................................   (2,867,072)    (8,884,131)
                                                                    -----------   ------------

TOTAL INCREASE (DECREASE) IN NET ASSETS...........................   (4,743,497)    (3,840,627)

NET ASSETS
- ----------------------------------------------------------------------------------------------
 Beginning of period..............................................   60,597,707     64,438,334
                                                                    -----------   ------------
 End of period (including undistributed net investment income of
  $208,717 and $184,905, respectively)............................  $55,854,210   $ 60,597,707
                                                                    ===========   ============
</TABLE>

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)              CTFR VERMONT MUNICIPAL PORTFOLIO - 9
<PAGE>
 
                         NOTES TO FINANCIAL STATEMENTS

NOTE A-SIGNIFICANT ACCOUNTING POLICIES

GENERAL: The Vermont Municipal Portfolio (the "Portfolio"), a series of Calvert
Tax-Free Reserves (the "Fund"), is registered under the Investment Company Act
of 1940 as a nondiversified, open-end management investment company. The
operations of each series are accounted for separately.  The Portfolio offers
Class A and Class C shares of beneficial interest. Class A shares are sold with
a maximum front-end sales charge of 3.75%. Class C shares, which have no
transaction-based sales charge, have a higher annual expense rate than Class A.
Each class has different: (a) dividend rates, due to differences in Distribution
Plan expenses and other class specific expenses, (b) exchange privileges and (c)
class specific voting rights.


SECURITY VALUATION:  Municipal securities are valued utilizing the average of
bid prices or at bid prices based on a matrix system (which considers such
factors as security prices, yields, maturities and ratings) furnished by dealers
through an independent pricing service. Securities listed or traded on a
national securities exchange are valued at the last reported sale price. Other
securities and assets for which market quotations are not available or deemed
inappropriate are valued in good faith under the direction of the Board of
Trustees.

OPTIONS:  The Portfolio may write or purchase option securities. The option
premium is the basis for recognition of unrealized or realized gain or loss on
the option. The cost of securities acquired or the proceeds from securities sold
through the exercise of the option is adjusted by the amount of the premium.

FUTURES CONTRACTS:  The Portfolio may enter into futures contracts agreeing to
buy or sell a financial instrument for a set price at a future date. The
Portfolio maintains securities with a value equal to its obligation under each
contract.  Initial margin deposits of either cash or securities are made upon
entering into futures contracts; thereafter, variation margin payments are made
or received daily reflecting the change in market value. Unrealized or realized
gains and losses are recognized based on the change in market value. Risks of
futures contracts arise from the possible illiquidity of the futures markets and
the movement in the value of the investment or in interest rates.

SECURITY TRANSACTIONS AND INVESTMENT INCOME:  Security transactions are
accounted for on trade date. Realized gains and losses are recorded on an
identified cost basis. Interest income, accretion of discount and amortization
of premium are recorded on an accrual basis.

DISTRIBUTIONS TO SHAREHOLDERS:  Distributions to shareholders are recorded by
the Portfolio on ex-dividend date.  Dividends from net investment income are
paid monthly.  Distributions from net realized capital gains, if any, are paid
at least annually.  Distributions are determined in accordance with income tax
regulations which may differ from generally accepted accounting principles;
accordingly, periodic reclassifications are made within the Portfolio's capital
accounts to reflect income and gains available for distribution under income tax
regulations.


10 - CTFR VERMONT MUNICIPAL PORTFOLIO             SEMI-ANNUAL REPORT (UNAUDITED)

<PAGE>
 
EXPENSE OFFSET ARRANGEMENTS:  The Portfolio has an arrangement with its
custodian bank whereby the custodian's fees are paid indirectly by credits
earned on the Portfolio's cash on deposit with the bank. Such deposit
arrangement is an alternative to overnight investments.

FEDERAL INCOME TAXES:  No provision for federal income or excise tax is required
since the Portfolio intends to continue to qualify as a regulated investment
company under the Internal Revenue Code and to distribute substantially all of
its earnings.

NOTE B--RELATED PARTY TRANSACTIONS

Calvert Asset Management Company, Inc. (the "Advisor") is wholly-owned by
Calvert Group, Ltd. ("Calvert"), which is indirectly wholly-owned by Acacia
Mutual Life Insurance Company.  The Advisor provides investment advisory
services and pays the salaries and fees of officers and affiliated Trustees of
the Portfolio.  For its services, the Advisor receives a monthly fee based on an
annual rate of .60% of the Portfolio's average daily net assets.

Calvert Administrative Services Company, an affiliate of the Advisor, provides
administrative services to the Fund for an annual fee, payable monthly, of
$200,000 which is allocated to all of the Portfolios of the Fund based on their
relative net assets.

Calvert Distributors, Inc., an affiliate of the Advisor, is the distributor and
principal underwriter for the Portfolio.  A Distribution Plan, adopted by Class
C shareholders, allows the Portfolio to pay the distributor for expenses and
services associated with distribution of shares.  The expenses paid may not
exceed 1.0% annually of average daily net assets of Class C.

The Distributor received $13,941 as its portion of commissions charged on sales
of the Portfolio's Class A shares.

Calvert Shareholder Services, Inc., an affiliate of the Advisor, acts as
transfer, dividend disbursing and shareholder servicing agent for the Portfolio.

Each Trustee who is not affiliated with the Advisor receives an annual fee of
$20,250 plus up to $1,200 for each Board and Committee meeting attended.
Trustee's fees are allocated to each of the funds served.

NOTE C--INVESTMENT ACTIVITY

During the period, purchases and sales of investments, other than short-term,
were $5,565,639 and $9,975,634, respectively.

The cost of investments owned at June 30, 1996 was substantially the same for
federal income tax and financial reporting purposes.  Net unrealized
appreciation aggregated $2,219,750, of which $2,466,649 related to appreciated
securities and $246,899 related to depreciated securities.

As a cash management practice, the Portfolio may sell or purchase short-term
variable rate demand notes from other Portfolios managed by the Advisor.  The
transactions are effected at par with no gain or loss to the Portfolio, in
accordance with policies of the Fund.


SEMI-ANNUAL REPORT (UNAUDITED)             CTFR VERMONT MUNICIPAL PORTFOLIO - 11
<PAGE>
 
Note D-Capital Shares
Transactions in shares of beneficial interest ("capital shares") were as
follows:
<TABLE>
<CAPTION>
 
 
Class A Share Activity
<S>                              <C>        <C>
Shares Sold....................   149,268      302,854
Reinvestment of Distributions..    39,866      136,701
Shares Redeemed                  (368,518)  (1,003,353)
 Net Share Activity              (179,384)    (563,798)
 
 
 
Class C Share Activity
Shares Sold....................    15,648       27,415
Reinvestment of Distributions         472        1,195
Shares Redeemed                   (12,902)     (19,207)
 Net Share Activity                 3,218        9,403
</TABLE>

Note E-Subsequent Event

Effective on or about October 28, 1996, all outstanding Class C shares in the
Portfolio will be converted automatically into an equivalent value of Class A
shares. This transaction is a non-taxable exchange and no sales charge will be
applied to the Class A shares issued.

                                Six Months Ended
                                 June 30, 1996

                                   Year Ended
                               December 31, 1995

                                   Year Ended
                               December 31, 1995

                                Six Months Ended
                                 June 30, 1996

# - CTFR VERMONT MUNICIPAL PORTFOLIO

                                                  SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS

                                                       Periods Ended       
                                                ---------------------------
                                                June 30,     December 31,
Class A Shares                                    1996     1995       1994
- ---------------------------------------------------------------------------
<S>                                             <C>       <C>       <C>
Net asset value, beginning...................   $ 16.62   $ 15.34   $ 16.66
                                                =======   =======   =======
Income from investment operations                                              
 Net investment income.......................       .43       .87       .87     
 Net realized and unrealized gain (loss).....      (.53)     1.35     (1.35)
                                                -------   -------   -------
   Total from investment operations..........      (.10)     2.22      (.48)
                                                -------   -------   -------
Distributions from                                                             
 Net investment income.......................      (.42)     (.85)     (.84)   
 Net realized gains..........................         -      (.09)        -
                                                -------   -------   -------
   Total distributions.......................      (.42)     (.94)     (.84)
                                                -------   -------   -------
Total increase (decrease) in net asset value.      (.52)     1.28     (1.32)
                                                -------   -------   -------
Net asset value, ending......................   $ 16.10   $ 16.62   $ 15.34    
                                                =======   =======   =======
Total return*................................      (.58%)   14.86%    (2.88%)
                                                =======   =======   =======
Ratios to average net assets:                                                  
 Net investment income.......................      5.27%(a)  5.35%     5.47%
                                                =======   =======   =======    
 Total expenses+.............................       .79%(a)   .76%        -
                                                =======   =======   =======
 Net expenses................................       .75%(a)   .75%      .73%
                                                =======   =======   =======
Portfolio turnover...........................        10%       12%       11%
                                                =======   =======   =======
Net assets, ending (in thousands)............   $55,421   $60,203   $64,215
                                                =======   =======   =======
Number of shares outstanding,
 ending (in thousands).......................     3,442     3,621     4,185
                                                =======   =======   =======
</TABLE>


<TABLE>
<CAPTION>
                                                       Periods Ended       
                                                ---------------------------
                                                        December 31,
Class A Shares                                    1993     1992     1991/\
- ---------------------------------------------------------------------------
<S>                                             <C>       <C>       <C>
Net asset value, beginning....................  $ 15.83   $ 15.58   $ 15.00
                                                =======   =======   =======
Income from investment operations
 Net investment income........................      .86       .84       .68
 Net realized and unrealized gain (loss)......      .82       .31       .58
                                                -------   -------   -------
   Total from investment operations...........     1.68      1.15      1.26
                                                -------   -------   -------
Distributions from
 Net investment income........................     (.85)     (.84)     (.66)
 Net realized gains...........................        -      (.06)     (.02)
                                                -------   -------   -------
   Total distributions........................     (.85)     (.90)     (.68)
                                                -------   -------   -------
Total increase (decrease) in net asset value..      .83       .25       .58
                                                -------   -------   -------
Net asset value, ending.......................  $ 16.66   $ 15.83   $ 15.58
                                                =======   =======   =======
Total return*.................................    10.84%     4.99%    11.43%(a)
                                                =======   =======   =======
Ratios to average net assets:
 Net investment income........................     5.25%     5.41%     5.97%(a)
                                                =======   =======   =======
 Total expenses+..............................        -         -         -
                                                =======   =======   =======
 Net expenses.................................      .72%      .62%      .28%(a)
                                                =======   =======   =======
 Expenses reimbursed..........................        -         -       .06%(a)
                                                =======   =======   =======
Portfolio turnover............................        5%       11%        8%
                                                =======   =======   =======
Net assets, ending (in thousands).............  $67,634   $53,179   $38,828
                                                =======   =======   =======
Number of shares outstanding,
 ending (in thousands)........................    4,060     3,359     2,492
                                                =======   =======   =======
</TABLE>


SEMI-ANNUAL REPORT (UNAUDITED)             CTFR VERMONT MUNICIPAL PORTFOLIO - 13
<PAGE>
 
<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS

                                                       PERIODS ENDED
                                                ----------------------------
                                                JUNE 30,       DECEMBER 31,
CLASS C SHARES                                    1996       1995    1994(#)
- ----------------------------------------------------------------------------
<S>                                             <C>         <C>      <C>
Net asset value, beginning....................  $16.42      $15.26   $16.40
                                                ======      ======   ======
Income from investment operations
- ---------------------------------
  Net investment income.......................     .29         .58      .51
  Net realized and unrealized gain (loss).....    (.55)       1.35    (1.06)
                                                ------      ------   ------
    Total from investment operations..........    (.26)       1.93     (.55)
                                                ------      ------   ------
Distributions from
- ------------------
  Net investment income.......................    (.27)       (.68)    (.59)
  Net realized gains..........................       -        (.09)       -
                                                ------      ------   ------
    Total distributions.......................    (.27)       (.77)    (.59)
                                                ------      ------   ------
Total increase (decrease) in net asset value..    (.53)       1.16    (1.14)
                                                ------      ------   ------
Net asset value, ending.......................  $15.89      $16.42   $15.26
                                                ======      ======   ======

Total return*.................................   (1.57%)     12.88%   (2.94%)
                                                ======      ======   ======
Ratios to average net assets:

  Net investment income.......................    3.35%(a)    3.61%    3.87%(a)
                                                ======      ======   ======
  Total expenses+.............................    2.74%(a)    2.47%       -
                                                ======      ======   ======
  Net expenses................................    2.70%(a)    2.46%    2.41%(a)
                                                ======      ======   ======
  Expenses reimbursed.........................       -           -     1.85%(a)
                                                ======      ======   ======
Portfolio turnover............................      10%         12%      11%
                                                ======      ======   ======
Net assets, ending (in thousands).............  $  433      $  394   $  223
                                                ======      ======   ======
Number of shares outstanding,
  ending (in thousands).......................      27          24       15
                                                ======      ======   ======
</TABLE>

*    Total return is not annualized for periods of less than one year and does
     not reflect deduction of Class A front-end sales charge.
(a)  Annualized
+    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.
(/\) From April 1, 1991, inception.
(#)  From March 1, 1994, inception.


14 - CTFR VERMONT MUNICIPAL PORTFOLIO       SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
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SEMI-ANNUAL REPORT (UNAUDITED)             CTFR VERMONT MUNICIPAL PORTFOLIO - 15
<PAGE>
 
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16-CTFR VERMONT MUNICIPAL PORTFOLIO               SEMI-ANNUAL REPORT (UNAUDITED)


<PAGE>
 
                              To Open an Account:
                              ...................
                                 800-368-2748

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

                                  Service for
                               Existing Account:
                              ...................
                          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, 6t Floor
                                1004 Baltimore
                            Kansas City, MO  64105

                                   Web Site:
                              ...................
                     Address: http://www.calvertgroup.com

                                   Principal
                                 Underwriter:
                              ...................
                          Calvert Distributors, Inc.
                            4550 Montgomery Avenue
                                  Suite 1000N
                           Bethesda, Maryland 20814



     This report is intended to provide fund information to shareholders.
It is not authorized for distribution to prospective investors unless preceded 
                        or accompanied by a prospectus.


<PAGE>
 
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