CALVERT FUND
N-30D, 1996-06-10
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<PAGE>

 

                                                        Calvert
                                                        Strategic
                                                        Growth
                                                        Fund

                                                        Annual Report
                                                        March 31, 1996





                           Investing with Vision(TM)
                             [LOGO] Calvert Group
                        A member of The Acacia Group(R)
<PAGE>
 
                         Calvert Strategic Growth Fund

Dear Shareholder:
  
  This report covers performance results for the Calvert Strategic Growth Fund
for the 12-month period ending March 31, 1996.

  The fiscal year closed on a strong note with returns from the second half
outpacing most indices. However, performance from the first half - during which
the Fund was defensively positioned - slowed the yearly gain, and the Fund
posted a 12.56% return for the period versus 32.07% and 29.09% for the S&P 500
and Russell 2000 indices, respectively.

Year in Review

  During the first half of the fiscal year, the Fund took a defensive posture
based on negative readings of the Five Market Principles, investment criteria
developed and employed by the Fund manager to assess market risk. With the
benefit of hindsight, this defensive stance was overly cautious.

  Historically, a negative reading of the Five Market Principles has preceded
market corrections of 20% or more within a short period of time. There have been
only two exceptions: 1968 and 1995.

  Going forward, we have made the following adjustments:

 . Before moving to a defensive position following a High Risk signal from the
model, we will wait for technical confirmation of a market top.

 . During a High Risk market environment, we will maintain a cautiously invested
position. One of our primary goals is to preserve capital when market conditions
are risky. Last year, we erred on the side of caution.

  During the second quarter of the fiscal year, the investment posture began to
change. This marked the turn in performance for the Fund. Market weakness in
July afforded an opportunity to enter high-quality growth stocks at lower
prices. Long exposure was increased, but we maintained a cautious stance during
the historically weak period from September through November. Maintaining a
higher level of cash allowed us to enter the market aggressively in the third
quarter of the fiscal year, resulting in strong performance.

  As the market entered the new calendar year, we believed volatility would be
substantially greater than in 1995. Improvement in some of our key indicators,
however, suggested the volatility could be used as an opportunity to enhance

                            Investment Performance
<TABLE>
<CAPTION>
Periods Ended 3/31/96     6 Months   12 Months
- ----------------------------------------------
<S>                       <C>        <C>
Strategic Growth Fund     13.10%     12.56%
 
S&P 500 Mthly Reinv.      11.70%     32.07%
 
Russell 2000               7.41%     29.09%
 
</TABLE>
               Investment performance is for Class A shares and
         does not reflect the deduction of any front-end sales charge.


ANNUAL REPORT                                  CALVERT STRATEGIC GROWTH FUND - 1
<PAGE>
 
Portfolio return rather than a reason to watch from the sidelines. This strategy
paid off as the Fund turned in a strong fiscal fourth quarter.

  Though we experienced some pressure on the Portfolio during the market's sharp
downward move in January, we treated the volatility as a buying opportunity in
high-quality growth stocks. Our conviction was rewarded as prices of many of our
holdings quickly rebounded and have appreciated significantly since mid-January.
We were also able to liquidate our position in precious metals near the top of
the recent move. The Fund was approximately 86% invested at the end of February.

  The Calvert Strategic Growth Fund invests in high-quality growth equities for
capital appreciation. Unlike most mutual funds, Strategic Growth has the goal of
actively managing risk in order to protect capital during bear cycles. The
investment posture of the Fund during the past year reflects changing concerns
held by the portfolio manager about the overall market environment.

1996 Market Outlook

  While we expect the bull market to continue this year, we also anticipate
increased volatility. This environment should create a market well-suited for
disciplined stock selection. Our strategy is to be cautiously invested and
attentive to any change in overall market trends.

  The small- and mid-cap stock sector is one area that offers potential for
further gains this year. Unlike the relatively overvalued large-capitalization
stocks, small- and mid-caps are comprised of "niche" companies with more
attractive relative valuations. And while earnings growth of larger
capitalization stocks are showing signs of slowing down to reflect moderate
economic growth, small-cap stocks are gaining momentum. Our analysis shows the
beginning of a divergence between large- and small-caps. It also indicates
small-caps are not fully valued relative to their growth rates.

Summary

  The Calvert Strategic Growth Fund is designed for investors with a long-term
investment horizon. An investor should expect times of extraordinary gains as
well as underperformance. We believe the Fund is poised to exhibit strong
relative performance in the years ahead.

  We appreciate your investment in the Calvert Strategic Growth Fund.

Sincerely,

/s/ Cedd Moses         /s/ Clifton S. Sorrell

Cedd Moses             Clifton S. Sorrell
Portfolio Manager      President
April 30, 1996

2 - CALVERT STRATEGIC GROWTH FUND                                  ANNUAL REPORT
<PAGE>
 
                             Portfolio Statistics

                          Ten Largest Stock Holdings
                             as of March 31, 1996

<TABLE> 
<CAPTION> 
                                          % of Net Assets
- ----------------------------------------------------------  
<S>                                       <C>      
  Cascade Communications Corp.                 6.2%
  Ascend Communications, Inc.                  5.0%
  Fore Systems                                 4.5%
  Corporate Express, Inc.                      3.3%
  Pairgain Technologies, Inc.                  3.2%
  Business Objects, S.A., ADR                  2.8%
  Macromedia, Inc.                             2.6%
  McAfee Associates, Inc.                      2.3%
  C Cube Microsystems, Inc.                    2.3%
  Gucci Group, N.V.                            2.1%
                                              -----
    Total                                     34.3%
                                              =====
</TABLE> 

                         Average Annual Total Returns
                       for periods ended March 31, 1996

         Class A Shares
          One Year                           7.19%
          Since Inception (5/94)            12.21%

         Class C Shares
          One Year                          11.57%
          Since Inception (5/94)            14.19%


                            Performance Comparison
              Comparison of change in value of $10,000 investment

                             [GRAPH APPEARS HERE]

                      Period between 05/01/94 to 03/31/96

         Calvert Strategic Growth Fund A Shares/Ending balance $12,444

         Calvert Strategic Growth Fund C Shares/Ending balance $12,866

                      S & P 500/R//Ending balance $15,259

                      Russel 2000/Ending balance $14,298

Total returns assume reinvestment of dividends and, for Class A shares, reflect
the deduction of the Fund's maximum sales charge of 4.75%. No sales charge has
been applied to the indices used for comparison. Past performance is no
guarantee of future results.



ANNUAL REPORT                                  CALVERT STRATEGIC GROWTH FUND - 3
<PAGE>
 
                       Report of Independent Accountants


To the Board of Trustees of the Calvert Fund and
Shareholders of the Calvert Strategic Growth Fund:

  We have audited the accompanying statement of assets and liabilities of
Calvert Strategic Growth Fund, including the statement of investments, as of
March 31, 1996, and the related statement of operations for the year then ended,
the statements of changes in net assets and financial highlights for the year
then ended and for the period May 5, 1994 (commencement of operations) through
March 31, 1995. These financial statements and financial highlights are the
responsibility of the Fund's management. Our responsibility is to express an
opinion on these financial statements and financial highlights based on our
audits.

  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Our procedures included confirmation of investments owned as of
March 31, 1996, by correspondence with the custodian and brokers. An audit also
includes assessing the accounting principles used and significant estimates made
by management, as well as evaluating the overall financial statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

  In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of
Calvert Strategic Growth Fund as of March 31, 1996, and the results of its
operations, the changes in its net assets and the financial highlights for the
periods referred to above, in conformity with generally accepted accounting
principles.


                                        COOPERS & LYBRAND L.L.P.

Baltimore, Maryland
May 8, 1996


4 - CALVERT STRATEGIC GROWTH FUND                                  ANNUAL REPORT
<PAGE>
 
                           Statement of Investments
                                March 31, 1996
<TABLE>
<CAPTION>

Equity Securities - 71.1%                                  Shares      Value
- -------------------------------------------------------------------------------
<S>                                                        <C>      <C>
Computer - Local Networks - 10.2%
Ascend Communications, Inc.*....................           139,900  $ 7,537,113
Cisco Systems, Inc.*............................            14,000      649,250
Fore Systems*...................................            94,500    6,756,750
Madge Networks, N.V.*...........................             9,700      389,213
                                                                     ----------
                                                                     15,332,326
                                                                     ----------

Computer - Memory Devices - 3.0%
C Cube Microsystems, Inc.*......................            65,800    3,454,500
EMC Corp.*......................................            45,600      997,500
                                                                     ----------
                                                                      4,452,000
                                                                     ----------

Computer - Peripheral Equipment - 1.6%
U.S. Robotics Corp..............................            18,900    2,442,825
                                                                     ----------
                                                                      2,442,825
                                                                     ----------

Computer - Services - 0.5%
Harbinger Corp.*................................            36,900      654,975
Meta Group, Inc.*...............................             5,000      141,250
                                                                     ----------
                                                                        796,225
                                                                     ----------

Computer - Software - 20.2%
Applix, Inc.*...................................            53,600    1,876,000
Arbor Software Corp.*...........................             8,400      363,300
Astea International, Inc.*......................            68,100    2,008,950
Atria Software, Inc.*...........................             6,000      328,500
Baan Co., N.V.*.................................            21,700    1,250,463
Business Objects, S.A., ADR*....................            49,000    4,165,000
Cambridge Technology Partners*..................            13,900      794,037
CBT Group Publishing Ltd., ADR*.................            34,300    2,521,050
Clarify, Inc.*..................................             2,700      105,975
Crystal Dynamics, Inc., Series D................            13,334      100,005
Documentum, Inc.*...............................               500       17,625
HNC Software, Inc.*.............................             8,500      578,000
Inference Corp., Class A*.......................            47,600      880,600
Informix Corp.*.................................            72,100    1,901,637
Inso Corp.*.....................................            16,100      742,613
Intuit*.........................................            26,300    1,183,500
Legato Systems, Inc.*...........................             7,600      286,900
Macromedia, Inc.*...............................            90,400    3,864,600
McAfee Associates, Inc.*........................            64,100    3,509,475
Novadigm, Inc.*.................................            72,400    1,095,050
Peoplesoft, Inc.*...............................            16,500      948,750
Prism Solutions, Inc.*..........................             4,000      106,000
</TABLE>


ANNUAL REPORT                                 CALVERT STRATEGIC GROWTH FUND - 5

<PAGE>
 
<TABLE>
<CAPTION>

Equity Securities (Cont'd)                                  Shares      Value
- -------------------------------------------------------------------------------
<S>                                                       <C>      <C>
Computer - Software (Cont'd)
Red Brick Systems, Inc.*........................             2,500  $   107,500
Remedy Corp.*...................................            29,800    1,683,700
SQA, Inc.*......................................             5,000      136,250
                                                                     ----------
                                                                     30,555,480
                                                                     ----------

Computer - Systems - 2.9%
Citrix Sytems, Inc.*............................            44,400    1,964,700
Discreet Logic, Inc.*...........................            11,670      160,463
HCIA, Inc.*.....................................            27,800    1,306,600
Imnet Systems, Inc.*............................            23,850      721,463
Oracle Corp.....................................             4,300      202,637
                                                                     ----------
                                                                      4,355,863
                                                                     ----------

Electronics - Instruments - 0.7%
Tektronix, Inc..................................            34,300    1,114,750
                                                                     ----------
                                                                      1,114,750
                                                                     ----------

Electronics - Semiconductors - 6.2%
Cypress Semiconductor Corp.*....................            50,000      587,500
DSP Communications, Inc.*.......................            39,800      995,000
Flextronics International, Ltd.*................            29,500      899,750
Micron Technology, Inc..........................            40,600    1,273,825
Sanmina Corp.*..................................            58,200    1,731,450
Uniphase Corp.*.................................            29,000    1,123,750
Xylan Corp.*....................................             2,000      104,000
Zoran Corp.*....................................           121,900    2,712,275
                                                                     ----------
                                                                      9,427,550
                                                                     ----------

Medical and Pharmaceutical - 5.7%
Biochem Pharma, Inc.*...........................            41,100    1,685,100
Compdent Corp.*.................................            53,700    1,933,200
Dura Pharmaceuticals, Inc.*.....................            45,900    2,277,787
Foundation Health Corp.*........................             9,600      366,000
Jones Medical Industries, Inc...................            33,250    1,280,125
Physician Sales and Services, Inc.*.............            41,100    1,017,225
                                                                     ----------
                                                                      8,559,437
                                                                     ----------

Office Equipment and Supplies - 1.8%
Staples, Inc.*..................................           136,425    2,779,659
                                                                     ----------
                                                                      2,779,659
                                                                     ----------

Printing and Publishing - 0.1%
Xeikon, N.V., ADR...............................             2,000       38,750
                                                                     ----------
                                                                         38,750
                                                                     ----------

Retail - 6.3%
Corporate Express, Inc.*........................           150,700    4,973,100
Gadzooks, Inc.*.................................            11,000      382,250
Gucci Group, N.V.*..............................            66,600    3,196,800
</TABLE>

6 - CALVERT STRATEGIC GROWTH FUND                                 ANNUAL REPORT


<PAGE>
 
<TABLE>
<CAPTION>

<S>                                                     <C>          <C>
Equity Securities (Cont'd)                                 Shares       Value
- -------------------------------------------------------------------------------
Retail (Cont'd)
Home Centers Diy, Ltd.*.........................           10,000  $     65,000
Intimate Brands, Inc., Class A..................           48,900       947,437
                                                                    -----------
                                                                      9,564,587
                                                                    -----------

Telecommunications - 11.9%
Cascade Communications Corp.*...................          104,700     9,396,825
Harmonic Lightwaves, Inc.*......................           27,200       374,000
Pairgain Technologies, Inc.*....................           74,500     4,823,875
Premiere Technologies, Inc.*....................           13,850       322,013
Premisys Communications, Inc.*..................           44,900     1,459,250
Qualcomm, Inc.*.................................           38,700     1,606,050
                                                                    -----------
                                                                     17,982,013
                                                                    -----------

 Total Equity Securities (Cost $97,678,515).....                    107,401,465
                                                                    -----------

Options Purchased - 39.3%                               Contracts
- -------------------------------------------------------------------------------
S&P 500 Index Call Options
 Expiration 6/22/96, Strike Price 645...........           14,000    32,375,000
S&P 500 Index Put Options
 Expiration 6/22/96, Strike Price 650...........           14,000    27,037,500
                                                                    -----------

 Total Options Purchased (Premium $62,937,000)..                     59,412,500
                                                                    -----------

                                                        Principal
Repurchase Agreements - 6.6%                               Amount
- -------------------------------------------------------------------------------
Donaldson, Lufkin & Jenrette: 5.35%,
 dated 3/29/96, due 4/1/96
  ($10,232,480, Ref Corp Strip,
   Zero Coupon, 7/15/02)........................      $10,000,000    10,000,000
                                                                    -----------

 Total Repurchase Agreements (Cost $10,000,000).                     10,000,000
                                                                    -----------

U.S. Government Agencies and
Instrumentalities - 9.9%
- -------------------------------------------------------------------------------
Federal Home Loan Mortgage Corp., 5.29%, 5/1/96.       15,000,000    14,933,875
                                                                    -----------

 Total U.S. Government Agencies and
  Instrumentalities  (Cost $14,933,875).........                     14,933,875
                                                                    -----------

U.S. Treasury - 5.7%
- -------------------------------------------------------------------------------
U.S. Treasury Bills,  4.95%, 5/2/96.............        4,700,000     4,679,132
U.S. Treasury Bills,  5.305%, 5/9/96............           90,000        89,514
U.S. Treasury Notes,  5.00%, 2/15/99............        4,000,000     3,906,240
                                                                    -----------

 Total U.S. Treasury  (Cost $8,688,052).........                      8,674,886
                                                                    -----------

Community Loan Notes - 0.5%
- -------------------------------------------------------------------------------
Illinois Facilities Fund, 4.00%, 9/30/96 +......          100,000        96,887
Low Income Housing Fund, 4.00%, 1/12/99 +.......          350,000       333,676
Rural Community Assistance Corp., 3.50%,
 6/28/96 +......................................          100,000        98,251
</TABLE>

ANNUAL REPORT                                 CALVERT STRATEGIC GROWTH FUND - 7
 
<PAGE>
 
<TABLE>
<CAPTION>
                                                        Principal
Community Loan Notes (Cont'd)                              Amount         Value
- -------------------------------------------------------------------------------
<S>                                                  <C>               <C>
Unitarian Universalist Affordable
 Housing Corp., 3.50%, 6/28/96 +................          $50,000  $     49,125
Washington Area Community Investment Fund,
 3.50%, 6/28/96 +...............................           50,000        49,125
Working Capital Management,
 4.00%, 9/30/96 +...............................           50,000        48,444
                                                                    -----------

   Total Community Loan Notes (Cost $700,000)...                        675,508
                                                                    -----------

      TOTAL INVESTMENTS
       (Cost $194,937,442) -- 133.1%............                    201,098,234
      Securities Sold Short -- (7.1%)...........                    (10,713,688)
      Options Written -- (33.6%)................                    (50,750,000)
      Other assets and liabilities, net -- 7.6%.                     11,461,172
                                                                   ------------
      Net Assets - 100%.........................                   $151,095,718
                                                                   ============
</TABLE>
                      Schedule of Securities Sold Short
                              March 31, 1996

<TABLE>
<CAPTION>

Equity Securities                                          Shares     Value
- -------------------------------------------------------------------------------
<S>.............................................     <C>               <C>
Avid Technology, Inc............................            46,400  $   974,400
Broderbund Software, Inc........................            15,500      585,125
Cirrus Logic, Inc...............................            81,400    1,470,288
Cypress Semiconductor Corp......................            50,000      587,500
EMC Corp........................................            45,600      997,500
Foundation Health Corp..........................             9,600      366,000
Intuit..........................................            26,300    1,183,500
Micron Technology, Inc..........................            40,600    1,273,825
Physician Reliance Network, Inc.................            14,000      554,750
Qualcomm, Inc...................................            38,700    1,606,050
Tektronix, Inc..................................            34,300    1,114,750
                                                                   ------------
   TOTAL EQUITY SECURITIES SOLD SHORT
     (Proceeds $12,766,110).....................                    $10,713,688
                                                                    ===========
</TABLE>
                          Schedule of Options Written
                                 March 31, 1996
<TABLE>
<CAPTION>
Options Written                                         Contracts
- -------------------------------------------------------------------------------
<S>.............................................     <C>            <C>
S&P 500 Index Call Options
 Expiration 6/22/96, Strike Price 650...........            14,000  $27,125,000
S&P 500 Index Put Options
 Expiration 6/22/96, Strike Price 645...........            14,000   23,625,000
                                                                    -----------
   TOTAL OPTIONS WRITTEN
    (Premium $55,970,132).......................                    $50,750,000
                                                                    ===========
</TABLE>



 *  Non income producing.
 +  Restricted security.
 See notes to financial statements.

8 - CALVERT STRATEGIC GROWTH FUND                                  ANNUAL REPORT
<PAGE>
 
                      Statement of assets and liabilities

                                 March 31, 1996
<TABLE>
<CAPTION>
Assets                                                                           Value
- ------------------------------------------------------------------------------------------
<S>                                                                           <C>
Investments in securities, at value......................................     $201,098,234
Cash.....................................................................          551,144
Receivable for securities sold...........................................        2,661,423
Receivable for shares sold...............................................          215,513
Interest and dividends receivable........................................           41,489
Deposits with brokers....................................................       15,452,229
Other assets.............................................................           26,615
                                                                              ------------
 Total assets............................................................      220,046,647
                                                                              ------------

Liabilities
- ------------------------------------------------------------------------------------------
Payable for securities purchased.........................................        5,934,528
Payable for shares redeemed..............................................        1,194,986
Securities sold short, at value (proceeds $12,766,110)...................       10,713,688
Options written, at value (premium $55,970,132)..........................       50,750,000
Payable to Calvert Asset Management Co., Inc.............................          263,553
Payable to Calvert Shareholder Services, Inc.............................           26,536
Payable to Calvert Distributors, Inc.....................................           47,588
Accrued expenses and other liabilities...................................           20,050
                                                                              ------------
 Total liabilities.......................................................       68,950,929
                                                                              ------------
  Net assets.............................................................     $151,095,718
                                                                              ------------

Net Assets Consist of:
- ------------------------------------------------------------------------------------------
Paid-in capital applicable to the following shares of beneficial interest;
 unlimited number of no par shares authorized:
  Class A: 6,739,990 shares outstanding..................................     $109,271,636
  Class C: 1,379,762 shares outstanding..................................       22,633,893
Accumulated net realized gain (loss) on investments......................        5,756,843
Net unrealized appreciation (depreciation) on investments................       13,433,346
                                                                              ------------
 Net assets..............................................................     $151,095,718
                                                                              ============

Net Asset Value Per Share
- ------------------------------------------------------------------------------------------
Class A (based on net assets of $125,605,662)............................           $18.64
                                                                              ============
Class C (based on net assets of $25,490,056).............................           $18.47
                                                                              ============
</TABLE>

See notes to financial statements.

ANNUAL REPORT                                  CALVERT STRATEGIC GROWTH FUND - 9
<PAGE>
 
                            Statement of Operations
                           Year Ended March 31, 1996
<TABLE>
<CAPTION>

Net Investment Income
- -------------------------------------------------------------------------------
<S>                                                              <C>
Investment Income
 Interest income............................................        $ 4,790,342
 Dividend income............................................             55,464
                                                                    -----------
  Total investment income...................................          4,845,806
                                                                    -----------
Expenses
 Investment advisory fee....................................          2,282,948
 Transfer agency fees and expenses..........................            363,268
 Distribution Plan expenses:
  Class A...................................................            317,541
  Class C...................................................            247,589
 Trustees' fees and expenses................................             13,288
 Administrative fees........................................            303,551
 Custodian fees.............................................             41,393
 Registration fees..........................................             55,166
 Reports to shareholders....................................            117,892
 Professional fees..........................................             27,402
 Miscellaneous expenses.....................................            144,042
 Reimbursement from Advisor.................................           (178,157)
                                                                    -----------
  Total expenses............................................          3,735,923
  Fees paid indirectly......................................            (41,393)
                                                                    -----------
   Net expenses.............................................          3,694,530
                                                                    -----------
    Net Investment Income...................................          1,151,276
                                                                    -----------


Realized and Unrealized Gain (Loss)
on Investments
- -------------------------------------------------------------------------------
Net realized gain (loss) on:
  Securities................................................          7,426,909
  Options written...........................................            (49,591)
  Securities sold short.....................................         (1,750,242)
  Futures...................................................          1,283,981
                                                                    -----------
                                                                      6,911,057

Change in unrealized appreciation or depreciation...........          9,845,857
                                                                    -----------

   Net Realized and Unrealized Gain
   (Loss) on Investments....................................         16,756,914
                                                                    -----------

   Increase (Decrease) in Net Assets
   Resulting From Operations................................        $17,908,190
                                                                    ===========
</TABLE>



See notes to financial statements.

10 - CALVERT STRATEGIC GROWTH FUND                               ANNUAL REPORT
<PAGE>
 
                      Statements of Changes in Net Assets


<TABLE>                                                          From Inception 
<CAPTION>                                                          May 5, 1994
                                                  Year Ended         Through
Increase (Decrease in Net Assets                March 31, 1996   March 31, 1995
- -------------------------------------------------------------------------------
<S>                                             <C>              <C>
Operations
 Net investment income..........................    $  1,151,276   $    727,864
 Net realized gain (loss)
  on investments................................       6,911,057      2,798,748
 Change in unrealized appreciation
  or depreciation...............................       9,845,857      3,587,489
                                                    ------------   ------------

  Increase (Decrease) in Net Assets
  Resulting From Operations.....................      17,908,190      7,114,101
                                                    ------------   ------------

Distributions to shareholders from
 Net investment income:
  Class A Shares................................      (1,548,699)      (158,700)
  Class C Shares................................        (152,946)       (18,795)
 Net realized gain:
  Class A Shares................................      (1,624,507)    (1,696,519)
  Class C Shares................................        (328,896)      (303,040)
                                                    ------------   ------------
 Total distributions............................      (3,655,048)    (2,177,054)
                                                    ------------   ------------

Capital share transactions:
 Shares sold:
  Class A Shares................................      64,185,609    110,223,061
  Class C Shares................................      15,176,622     23,305,871
 Reinvestment of distributions:
  Class A Shares................................       2,842,563      1,855,219
  Class C Shares................................         465,985        321,835
 Shares redeemed:
  Class A Shares................................     (60,303,058)    (9,531,758)
  Class C Shares................................     (12,307,161)    (4,329,259)
                                                    ------------   ------------
 Total capital share transactions...............      10,060,560    121,844,969
                                                    ------------   ------------

Total Increase (Decrease) in Net Assets.........      24,313,702    126,782,016

Net Assets
- --------------------------------------------------------------------------------
 Beginning of period............................     126,782,016           ----
 End of period (including undistributed net
  investment income of $0 and
  $550,369, respectively) ......................    $151,095,718   $126,782,016
                                                    ============   ============

</TABLE>


See notes to financial statements.

ANNUAL REPORT                                CALVERT STRATEGIC GROWTH FUND - 11
<PAGE>
 
                         Notes to Financial Statements

Note A--Significant Accounting Policies

General:  The Calvert Strategic Growth Fund (the "Fund"), a series of The
Calvert Fund, is registered under the Investment Company Act of 1940 as a non-
diversified, open-end management investment company. The operations of each
series are accounted for separately. The Fund offers Class A and Class C shares
of beneficial interest. Class A shares are sold with a maximum front-end sales
charge of 4.75%. 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:  Securities listed or traded on a national securities
exchange are valued at the last reported sale price. Unlisted securities and
listed securities for which the last sale price is unavailable are valued at the
most recent bid price or based on a yield equivalent obtained from the
securities' market maker. The Fund may invest in securities whose resale is
subject to restrictions. Restricted securities and 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.

Repurchase Agreements:  The Fund may enter into repurchase agreements with
recognized financial institutions or registered broker/dealers and, in all
instances, holds underlying securities with a value exceeding the total
repurchase price, including accrued interest.

Options:  The Fund 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 Fund may enter into futures contracts agreeing to buy or
sell a financial instrument for a set price at a future date. The Fund 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.

Securities Sold Short:  The Fund may sell securities that it does not own in
anticipation of a decline in their market price. Gains or losses represent the
difference between the sale proceeds and the price of the security.

Deposits with Brokers:  The Fund maintains liquid assets, including equivalent
securities, sufficient to cover, on a daily basis, the current values of written
options and securities sold short.

Security Transactions and Investment Income:  Security transactions are
accounted for on trade date. Realized gains and losses are recorded on an
identified cost basis. Dividend income is recorded on the ex-dividend date.

12 - CALVERT STRATEGIC GROWTH FUND                                 ANNUAL REPORT
<PAGE>
 
Interest income, accretion of discount and amortization of premium are recorded
on an accrual basis. Dividends declared on securities sold short are reported as
an expense.

Distributions to Shareholders:  Distributions to shareholders are recorded by
the Fund on ex-dividend date. Dividends from net investment income and
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.

The Fund designates $623,630 as long-term capital gain distributions from 1996
earnings.

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 a monthly fee based on an annual rate of
1.5% of the Fund's average daily net assets. Effective May, 1995, the Fund began
paying a monthly performance fee of plus or minus .15%, on an annual basis, of
average daily net assets of the performance period depending on the Fund's
performance compared to the Russell 2000 Index.

The Advisor reimburses the Fund for its operating expenses (excluding brokerage
fees, taxes, interest, Distribution Plan expenses and extraordinary items)
exceeding  the following annual rates of average daily net assets: 2.5% on the
first $30 million, 2.0% on the next $70 million and 1.5% on the excess of $100
million. Expenses reimbursed by the Advisor before December 31, 1994 may, to the
extent permitted by law, be repaid by the Fund from January 1, 1995 through
December 31, 1996. All expense reimbursements made from January 1, 1995 through
December 31, 1996 may be repaid from January 1, 1997 through December 31, 1998.
Expense repayments are subject to the above stated expense limitations.

Calvert Distributors, Inc., an affiliate of the Advisor, is the distributor and
principal underwriter for the Fund. Distribution Plans, adopted by each class of
shares, allow the Fund to pay the distributor for expenses and services
associated with distribution of shares. The expenses paid may not exceed .35%
and 1.0% annually of average daily net assets of each Class A and Class C,
respectively.

ANNUAL REPORT                                 CALVERT STRATEGIC GROWTH FUND - 13
<PAGE>
 
The Distributor received $247,094 as its portion of commissions charged on sales
of the Fund's shares.

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

Calvert Administrative Services Company, an affiliate of the Advisor, provides
administrative services to the Fund for an annual fee, payable monthly, of .20%
of the average daily net assets of 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.
Additional fees of up to $10,000 annually may be paid to the Chairperson of
special committees of the Board. Trustees fees are allocated to each of the
funds served.

Note C--Investment Activity

During the year, purchases and sales of investments, other than short-term and
U.S. government securities, were $325,722,668 and $254,704,133, respectively.
U.S. government security purchases were $23,990,498 and sales were $26,043,423.


The cost of investments owned at March 31, 1996 for federal income tax purposes
was $192,408,575. Net unrealized appreciation aggregated $8,689,659, of which
$12,529,162 related to appreciated securities and $3,839,503 related to
depreciated securities.

The following summarizes the Fund's transactions in written call and put options
during the year:
<TABLE>
<CAPTION>
 
Options                             Contracts         Premiums
- ------------------------------------------------------------------
<S>                                 <C>               <C>
  Outstanding, beginning of year        1,980         $ 1,077,079
  Written                              30,525          58,255,128
  Exercised                              (664)           (617,617)
  Closed                               (3,251)         (2,477,862)
  Expired                                (590)           (266,596)
                                    ----------        ------------ 
  Outstanding, ending of year          28,000         $55,970,132
                                    ==========        ============
</TABLE>

Securities having an aggregate market value of $59,412,500 were identified to
cover open options written at March 31, 1996.



14 - CALVERT STRATEGIC GROWTH FUND                                 ANNUAL REPORT
<PAGE>
 
Note D--Capital Shares
Transactions in shares of beneficial interest "capital shares" were as follows:

<TABLE>
<CAPTION>
                                                                 From Inception
                                                                   May 5, 1994
                                                   Year Ended        Through
Share Activity                                   March 31, 1996  March 31, 1995 
- --------------------------------------------------------------------------------
<S>                                              <C>              <C>
Class A:
 Shares sold                                          3,803,233       6,768,943
 Reinvestment of distributions                          164,542         108,719
 Shares redeemed                                     (3,537,947)       (567,500)
                                                     -----------      ----------
  Net share activity                                    429,828       6,310,162
                                                     ===========      ==========
 
Class C:
 Shares sold                                            905,375       1,410,707
 Reinvestment of distributions                           27,150          18,816
 Shares redeemed                                       (725,836)       (256,450)
                                                     -----------      ----------
  Net share activity                                    206,689       1,173,073
                                                     ===========      ==========
 
</TABLE>

ANNUAL REPORT                                CALVERT STRATEGIC GROWTH FUND - 15
<PAGE>            
 
                             Financial Highlights
<TABLE>
<CAPTION>
                                                   Class A Shares              Class C Shares
                                                   -------------------------------------------------
                                                                Periods Ended March 31,
                                                   -------------------------------------------------
                                                     1996         1995**        1996        1995**
- ----------------------------------------------------------------------------------------------------
<S>                                                <C>          <C>           <C>         <C>
Net asset value, beginning of period...........      $16.96       $15.00        $16.86     $15.00
                                                   =========    ===========   =========   ==========
Income from investment operations
- ---------------------------------
 Net investment income.........................         .13          .20          (.02)       .12
 Net realized and unrealized gain (loss)
  on investments...............................        1.96         2.21          1.94       2.18
                                                   ---------    -----------   ---------   ----------
  Total from investment operations.............        2.09         2.41          1.92       2.30
                                                   ---------    -----------   ---------   ----------
Distributions from
- ------------------
 Net investment income.........................        (.20)        (.04)         (.10)      (.03)
 Net realized gain.............................        (.21)        (.41)         (.21)      (.41)
                                                   ---------    -----------   ---------   ----------
  Total distributions..........................        (.41)        (.45)         (.31)      (.44)
                                                   ---------    -----------   ---------   ----------
Total increase (decrease) in net asset value...        1.68         1.96          1.61       1.86
                                                   ---------    -----------   ---------   ----------
Net asset value, end of period.................      $18.64       $16.96        $18.47     $16.86
                                                   =========    ===========   =========   ==========

Total return*..................................       12.56%       16.08%        11.57%     15.32%
                                                   =========    ===========   =========   ==========
Ratios to average net assets:
  Net investment income........................         .90%        1.47%(a)       .02%       .83%(a)
                                                   =========    ===========   =========   ==========
  Total expenses+..............................        2.32%          --          3.18%       --
                                                   =========    ===========   =========   ==========
  Net expenses.................................        2.29%        2.55%(a)      3.16%      3.45%(a)
                                                   =========    ===========   =========   ==========
  Expenses reimbursed..........................         .14%         .31%(a)        --        .20%(a)
                                                   =========    ===========   =========   ==========
Portfolio turnover.............................         402%         480%          402%       480%
                                                   =========    ===========   =========   ==========
Net assets, end of period (in thousands).......    $125,606     $107,004       $25,490    $19,778

Number of shares outstanding
  at end of period (in thousands)..............       6,740        6,310         1,380      1,173
                                                   =========    ===========   =========   ==========
</TABLE>

(a)  Annualized
 *   Total return is not annualized and does not reflect deduction of Class A
     front-end sales charge.
 +   Effective September 30, 1995, this ratio reflects total expenses before
     reduction for fees paid indirectly; such reductions are included in the
     ratio of net expenses.
 **  From May 5, 1994, inception.



16 - CALVERT STRATEGIC GROWTH FUND                                 ANNUAL REPORT

<PAGE>
 
                         CALVERT U.S. GOVERNMENT FUND

Dear Shareholder:

     The first quarter of 1996 proved to be a troublesome one for bond markets 
as strong economic data served to ignite investors' fears that inflation might 
be heating up again.

     From July of 1995 through January 1996, the Federal Reserve embarked on a 
program to stimulate the economy with a series of four cuts in short-term 
interest rates. But in February and March of this year, the Labor Department 
reported stronger-than-expected employment numbers. The increase in non-farm 
payrolls, for example, was the largest reported in more than 12 years.

     Concerned that the economy was gathering steam, investors adjusted their
inflationary expectations higher and long-term interest rates began to rise. The
yield on the benchmark 30-year Treasury bond rose to 6.7% by quarter's end and
bond prices, which move inversely to interest rates, dropped. Overall, the first
quarter was one of the worst on record for bonds, with long-term Treasurys
turning in a negative total return of approximately 8.5%.

                             TREASURY YIELD CURVE

                              [CHART APPEARS HERE]

FUND PERFORMANCE AND STRATEGY

     For the period covered by this report, the Portfolio's six-month total 
return of 1.58% closely matched that of the Lipper General U.S. Government Funds
Average of 1.61%. As of March 31, 1996, the Portfolio's weighted average 
maturity was 12 years.

                            INVESTMENT PERFORMANCE
<TABLE> 
<CAPTION>

Periods Ended 3/31/96            6 Months        12 Months
- ----------------------------------------------------------
<S>                               <C>              <C> 
U.S. Government Fund              1.58%            8.95%

Lipper General U.S. Govt.
  Funds Average                   1.61%            9.28%


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

</TABLE> 

SEMI-ANNUAL REPORT (UNAUDITED)                  CALVERT U.S. GOVERNMENT FUND - 1
<PAGE>
 
OUTLOOK

     Recent economic data, particularly the unusually large number of new jobs 
created during the first quarter, suggest that the economy is stronger than was 
previously believed. The current unemployment rate of 5.5%, for example, is the 
lowest it's been in years. Furthermore, the Federal Reserve has publicly stated 
its commitment to maintaining an economic growth rate in the range of 2% to 
2.5%, about where it is right now. Thus, in the near term, we do not expect the 
Fed to stimulate the economy with additional cuts in interest rates. Long-term 
interest rates are likely to stablilize in the near term and trade in a wide 
range going forward.

     We appreciate your investment in the Calvert U.S. Government Fund.

Sincerely,

/s/ CLIFTON S. SORRELL

Clifton S. Sorrell
President
April 30, 1996


2 - CALVERT U.S. GOVERNMENT FUND                  SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                             PORTFOLIO STATISTICS

                               MATURITY SCHEDULE

<TABLE> 
<CAPTION> 

% of Portfolio               3/31/96    9/30/95
- -----------------------------------------------
<S>                          <C>        <C>  
Less Than 1 Year                24%        15%

1-3 Years                       --         --

3-5 Years                       17%        29%

5-7 Years                       --         --

7-10 Years                      24%        23%

10-20 Years                     11%        10%

20 Years and Above              24%        23%

  Weighted Average         12 years   12 years

                                  SEC YIELDS

Thirty Days Ended            3/31/96    9/30/95
- -----------------------------------------------
Class A Shares                5.00%      4.52%

Class C Shares                3.19%      2.95%
</TABLE> 

                         AVERAGE ANNUAL TOTAL RETURNS
                       for periods ended March 31, 1996
<TABLE> 
<CAPTION> 

Class A Shares                             Class C Shares
<S>                       <C>              <C>                       <C> 
One Year                  4.90%            One Year                  6.10%

Five Year                 5.72%            Since Inception (3/94)    4.26%

Since Inception (5.86)    6.96%
</TABLE> 

                            PERFORMANCE COMPARISON

              Comparison of change in value of $10,000 investment

                             [GRAPH APPEARS HERE]

                     Period between 03/01/87 and 03/31/95

                  U.S. Government Fund/Ending balance $19,387

                  Lehman Government CD/Ending balance $22,435

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 sales 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 results.


SEMI-ANNUAL REPORT (UNAUDITED)                  CALVERT U.S. GOVERNMENT FUND - 3
<PAGE>
 
                            STATEMENT OF NET ASSETS
                                MARCH 31, 1996

<TABLE> 
<CAPTION> 

U.S. GOVERNMENT OBLIGATIONS, AGENCIES                                            PRINCIPAL
AND INSTRUMENTALITIES - 88.0%                                                     AMOUNT        VALUE
- --------------------------------------------------------------------------------------------------------
<S>                                                                             <C>           <C> 
Federal Home Loan Mortgage Assn., 5.27%, 4/4/96.............................    $1,000,000    $  999,561
Federal National Mortgage Assn., 5.59%, 7/01/96.............................     1,000,000     1,000,650
Federal National Mortgage Assn., 6.85%, 9/12/05.............................     2,000,000     1,972,120
Small Business Administration, 8.05%, 6/1/12................................       869,101       893,541
U.S. Treasury Notes, 7.50%, 10/31/99........................................     1,400,000     1,465,002
U.S. Treasury Bonds, 6.875%, 8/15/25........................................     1,000,000     1,014,110
                                                                                              ----------

  Total U.S. Government Obligations, Agencies 
  and Instrumentalities (Cost $7,407,197)...................................                   7,344,984
                                                                                              ----------

MORTGAGE SECURITIES - 11.5%
- --------------------------------------------------------------------------------------------------------
Federal National Mortgage Assn., 7.00%, 8/01/25.............................       977,861       952,808
Government National Mortgage Assn., 11.00%, 10/15/15........................         3,069         3,442
                                                                                              ----------

  Total Mortgage Securities (Cost $962,288).................................                     956,250
                                                                                              ----------

  TOTAL INVESTMENTS (Cost $8,369,485) - 99.5%...............................                   8,301,234
  Other assets and liabilities, net - 0.5%..................................                      40,076
                                                                                              ----------
  NET ASSETS - 100%.........................................................                  $8,341,310
                                                                                              ==========
NET ASSETS CONSIST OF:
- --------------------------------------------------------------------------------------------------------
Paid-in capital applicable to the following shares of beneficial interest,
  unlimited number of no par shares authorized:
    Class A: 551,004 shares outstanding.....................................                  $8,360,051
    Class B: 26,598 shares outstanding......................................                     374,286
Undistributed net investment income.........................................                       4,108
Accumulated net realized gain (loss) on investments.........................                    (328,884)
Net unrealized appreciation (depreciation) on investments...................                     (68,251)
                                                                                              ----------
  Net assets................................................................                  $8,341,310
                                                                                              ==========

NET ASSET VALUE PER SHARE
- --------------------------------------------------------------------------------------------------------
Class A (based on net assets of $7,959,945).................................                      $14.45
                                                                                              ==========
Class C (based on net assets of $381,365)...................................                      $14.34
                                                                                              ==========
</TABLE> 

See notes to financial statements.

4 - CALVERT U.S. GOVERNMENT FUND                  SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                            STATEMENT OF OPERATIONS
                        SIX MONTHS ENDED MARCH 31, 1996

<TABLE> 
<CAPTION> 

NET INVESTMENT INCOME
- -------------------------------------------------------------------------------
<S>                                                                    <C>
Investment Income
  Interest income...................................................   $305,618
                                                                       --------

Expenses
  Investment advisory fee...........................................     27,549
  Transfer agency fee and expenses..................................     13,869
  Distribution Plan expenses:
    Class A.........................................................     10,048
    Class C.........................................................      2,229
  Contract services.................................................      8,222
  Trustees' fees and expenses........................................       414
  Custodian fees....................................................      1,295
  Registration fees.................................................     11,217
  Reports to shareholders...........................................      3,695
  Professional fees.................................................        412
  Miscellaneous.....................................................        542
  Reimbursement from Advisor........................................     (3,989)
                                                                       --------
    Total expenses..................................................     75,503
    Fees paid indirectly............................................     (1,295)
                                                                       --------
      Net expenses..................................................     74,208
                                                                       --------
        NET INVESTMENT INCOME.......................................    231,419
                                                                       ========

    REALIZED AND UNREALIZED GAIN (LOSS) ON
    INVESTMENTS
- -------------------------------------------------------------------------------
    Net realized gain (loss)........................................     95,279
    Change in unrealized appreciation or depreciation...............   (181,700)
                                                                       --------
    NET REALIZED AND UNREALIZED GAIN
    (LOSS) ON INVESTMENTS...........................................    (86,421)
                                                                       --------

    INCREASE (DECREASE) IN NET ASSETS
    RESULTING FROM OPERATIONS.......................................   $144,989
                                                                       ========
</TABLE> 

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)                  CALVERT U.S. GOVERNMENT FUND - 5
<PAGE>
 
                      STATEMENT OF CHANGES IN NET ASSETS

<TABLE> 
<CAPTION> 

                                                             SIX MONTHS       YEAR ENDED
                                                               ENDED         SEPTEMBER 30,
INCREASE (DECREASE) IN NET ASSETS                          MARCH 31, 1996        1995
- ------------------------------------------------------------------------------------------
<S>                                                          <C>              <C> 
Operations
  Net investment income (loss)...........................    $   231,410      $   520,731
  Net realized gain (loss)...............................         95,279         (117,178)
  Change in unrealized appreciation
    or depreciation......................................       (181,700)         693,772
                                                             -----------      -----------
    INCREASE (DECREASE) IN NET ASSETS
    RESULTING FROM OPERATIONS............................        144,989        1,097,325
                                                             -----------      -----------

Distributions to shareholders from
  Net investment income:
    Class A Shares.......................................       (224,728)        (500,219)
    Class C Shares.......................................         (6,890)         (16,196)
                                                             -----------      -----------
  Total distributions....................................       (231,618)        (516,415)
                                                             -----------      -----------

Capital share transactions:
  Shares sold:
    Class A Shares.......................................        258,922          856,683
    Class C Shares.......................................        121,480          204,255
  Reinvestment of distributions:
    Class A Shares.......................................        223,102          479,506
    Class C Shares.......................................          6,598           15,952
  Shares redeemed:
    Class A Shares.......................................     (1,475,115)      (2,580,096)
    Class C Shares.......................................       (179,208)        (107,730)
                                                             -----------      -----------
  Total capital share transactions.......................     (1,044,221)      (1,131,430)
                                                             -----------      -----------
TOTAL INCREASE (DECREASE)
IN NET ASSETS............................................     (1,130,850)        (550,520)

NET ASSETS
- ------------------------------------------------------------------------------------------
  Beginning of period....................................      9,472,160       10,022,680
                                                             -----------      -----------
  End of period (including undistributed net investment
    income (loss) of $4,108 and $4,316, respectively)....    $ 8,341,310      $ 9,472,160
                                                             ===========      ===========
</TABLE> 

See notes to financial statements.

6 - CALVERT U.S. GOVERNMENT FUND                  SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                         NOTES TO FINANCIAL STATEMENTS

NOTE A--SIGNIFICANT ACCOUNTING POLICIES

General: The Calvert U.S. Government Fund (the "Fund"), a series of The Calvert
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 Fund 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: Securities listed or traded on a national securities 
exchange are valued at the last reported sale price. Unlisted securities and 
listed securities for which the last sale price is unavailable are valued at the
most recent bid price or based on a yield equivalent obtained from the 
securities' market maker. 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.

Repurchase Agreements: The Fund may enter into repurchase agreements with
recognized financial institutions or registered broker/dealers and, in all
instances, holds underlying securities with a value exceeding the total
repurchase price, including accrued interest.

Options: The Fund 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. The Fund 
maintains liquid assets sufficient to cover, on a daily basis, the current 
values of written options.

Futures Contracts: The Fund may enter into futures contracts agreeing to buy or 
sell a financial instrument for a set price at a future date. The Fund maintains
securities with a value equal to its obligation under each contract. Initial 
margin deposits of either cash or securities are made upon entering in 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.

SEMI-ANNUAL REPORT (UNAUDITED)                  CALVERT U.S. GOVERNMENT FUND - 7
<PAGE>
 
Distributions to Shareholders: Distributions to shareholders are recorded by the
Fund 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 Fund's capital accounts to
reflect income and gains available for distribution under income tax
regulations.

Expense Offset Arrangement: 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--REGULATED 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 an annual rate of 
 .60% of the Fund's average daily net assets.

The Advisor reimburses the Fund for its operating expenses (excluding brokerage
fees, taxes, interest, Distribution Plan expenses and extraordinary items)
exceeding the following annual rates of average daily net assets: 2.5% on the
first $30 million, 2.0% on the next $70 million and 1.5% on the excess of $100
million.

Calvert Distributors, Inc., an affiliate of the Advisor, is the distributor and 
principal underwriter for the Fund. Distribution Plans, adopted by each class of
shares, allow the Fund to pay the distributor for expenses and services 
associated with distribution of shares. The expenses paid may not exceed .25% 
and 1.0% annually of average daily net assets of each Class A and Class C, 
respectively.

The Distributor received $1,510 as its portion of the commissions charged on 
sales of the Fund's shares.

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.

8 - CALVERT U.S. GOVERNMENT FUND                  SEMI-ANNUAL REPORT (UNAUDITED)

<PAGE>
 
NOTE C--INVESTMENT ACTIVITY

During the period, purchases and sales of investments, other than short-term and
U.S. government securities, were $0 and $1,337,100, respectively. U.S. 
government security purchases were $1,126,875 and sales were $1,308,312.

The cost of investments owned at March 31, 1996 was substantially the same for 
federal income tax and financial reporting purposes. Net unrealized depreciation
aggregated $68,251, of which $74,617 related to appreciated securities and 
$142,868 related to depreciated securities.

Net realized capital loss carryforwards, for federal income tax purposes, of 
approximately $424,000 at September 30, 1995 may be utilized to offset current 
and future capital gains until expiration in 2003.

NOTE D--CAPITAL SHARES

Transactions in shares of beneficial interest ("capital shares") were as 
follows:

<TABLE> 
<CAPTION> 
                                                      SIX MONTHS
                                                         ENDED      YEAR ENDED
                                                       MARCH 31,   SEPTEMBER 30,
SHARE ACTIVITY                                           1996          1995
- --------------------------------------------------------------------------------
<S>                                                    <C>           <C> 
Class A:
  Shares sold......................................      17,467        60,800
  Reinvestment of distributions....................      15,174        34,307
  Shares redeemed..................................    (100,284)     (184,137)
                                                       --------      --------
    Net share activity.............................     (67,643)      (89,030)
                                                       ========      ========

Class C:
  Shares sold......................................       8,301        14,612
  Reinvestment of distributions....................         452         1,133
  Shares redeemed..................................     (12,203)       (7,705)
                                                       --------      --------
    Net share activity.............................      (3,450)        8,040
                                                       ========      ========
</TABLE> 

NOTE E--SUBSEQUENT EVENT

The shareholders of each class of the Fund were asked to vote on April 26, 1996 
on a merger into the Calvert Income Fund. Shareholder approval was granted on 
May 16, 1996 to effect a tax-free exchange of net assets of the Fund, Class A 
shares of approximately $7.7 million and Class C shares of approximately $.3 
million, for respective shares of the Calvert Income Fund.

SEMI-ANNUAL REPORT (UNAUDITED)                  CALVERT U.S. GOVERNMENT FUND - 9
<PAGE>
                             FINANCIAL HIGHLIGHTS
<TABLE> 
<CAPTION> 
                                                        PERIODS ENDED
                                              ---------------------------------
                                              MARCH 31,       SEPTEMBER 30,
CLASS A SHARES                                  1996        1995        1994
- -------------------------------------------------------------------------------
<S>                                            <C>         <C>         <C> 
NET ASSET VALUE, BEGINNING OF PERIOD.........  $ 14.61     $ 13.74     $ 16.17
                                               =======     =======     =======
Income from investment operations
- ---------------------------------
  Net investment income......................      .38         .78         .75
  Net realized and unrealized gain
    (loss) on investments....................     (.16)        .86       (1.53)
                                               -------     -------     -------
    Total from investment operations.........      .22        1.64        (.78)
                                               -------     -------     -------
Distributions from
- ------------------
  Net investment income......................     (.38)       (.77)       (.75)
  Net realized gain..........................       --          --        (.90)
                                               -------     -------     -------
    Total distributions......................     (.38)       (.77)      (1.65)
                                               -------     -------     -------
Total increase (decrease) in net asset value.     (.16)        .87       (2.43)
                                               -------     -------     -------
NET ASSET VALUE, END OF PERIOD...............  $ 14.45     $ 14.61     $ 13.74
                                               -------     -------     -------

Total return*................................     1.58%      12.30%      (5.19%)
                                               =======     =======     =======
Ratios to average net assets:
  Net investment income......................     5.14%(a)    5.52%       4.99%
                                               =======     =======     =======
  Total expenses+............................     1.55%(a)    1.62%         --
                                               =======     =======     =======
  Net expenses...............................     1.52%(a)    1.60%       1.02%
                                               =======     =======     =======
Portfolio turnover...........................       13%        133%         99%
                                               =======     =======     =======
NET ASSETS, END OF PERIOD (IN THOUSANDS).....  $ 7,960     $ 9,037     $ 9,721
                                               =======     =======     =======
Number of shares outstanding
  at end of period (in thousands)............      551         619         708
                                               =======     =======     =======

                                                         YEARS ENDED
                                              ---------------------------------
                                                        SEPTEMBER 30,
CLASS A SHARES                                  1993        1992        1991
- -------------------------------------------------------------------------------

NET ASSET VALUE, BEGINNING OF PERIOD.........  $ 15.72     $ 15.19     $ 14.50
                                               =======     =======     =======
Income from investment operations
- ---------------------------------
  Net investment income......................      .87         .95        1.00
  Net realized and unrealized gain
    (loss) on investments....................      .45         .53         .69
                                               -------     -------     -------
    Total from investment operations.........     1.32        1.48        1.69
                                               -------     -------     -------
Distributions from
- ------------------
  Net investment income......................     (.87)       (.95)      (1.00)
  Net realized gain..........................       --          --          --
                                               -------     -------     -------
    Total distributions......................     (.87)       (.95)      (1.00)
                                               -------     -------     -------
Total increase (decrease) in net asset value.      .45         .53         .69
                                               -------     -------     -------
NET ASSET VALUE, END OF PERIOD...............  $ 16.17     $ 15.72     $ 15.19
                                               -------     -------     -------


Total return*................................     8.70%      10.07%      12.07%
                                               =======     =======     =======
Ratios to average net assets:
  Net investment income......................     5.49%       6.15%      6.69%
                                               =======     =======     =======
  Total expenses+............................       --          --          --
                                               =======     =======     =======
  Net expenses...............................      .95%       1.11%       1.26%
                                               =======     =======     =======
Portfolio turnover...........................      191%         --          --
                                               =======     =======     =======
NET ASSETS, END OF PERIOD (IN THOUSANDS).....  $13,652     $13,223     $11,935
                                               =======     =======     =======
Number of shares outstanding
  at end of period (in thousands)............      844         841         785
                                               =======     =======     =======
</TABLE> 

10 - CALVERT U.S. GOVERNMENT FUND                 SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                      PERIODS ENDED
                                              -----------------------------
                                              MARCH 31,     SEPTEMBER 30,
CLASS C SHARES                                  1996       1995      1994**
- ---------------------------------------------------------------------------
<S>                                            <C>        <C>        <C> 
NET ASSET VALUE, BEGINNING OF PERIOD.........  $14.49     $13.71     $14.77
                                               ======     ======     ======
Income from investment operations
- ---------------------------------
  Net investment income......................     .22        .42        .34
  Net realized and unrealized gain
    (loss) on investments....................    (.14)       .94      (1.01)
                                               ------     ------     ------
    Total from investment operations.........     .08       1.36       (.67)
                                               ------     ------     ------
Distributions from
- ------------------
  Net investment income......................    (.23)      (.58)      (.39)
  Net realized gain..........................      --         --         --
                                               ------     ------     ------
    Total distributions......................    (.23)      (.58)      (.39)
                                               ------     ------     ------
Total increase (decrease) in net asset value.    (.15)       .78      (1.06)
                                               ------     ------     ------
NET ASSET VALUE, END OF PERIOD...............  $14.34     $14.49     $13.71
                                               ------     ------     ------

Total return*................................      50%     10.21%     (3.58%)
                                               ======     ======     ======
Ratios to average net assets:
  Net investment income......................    3.16%(a)   3.60%      4.39%(a)
                                               ======     ======     ======
  Total expenses+............................    3.53%(a)   3.53%        --
                                               ======     ======     ======
  Net expenses...............................    3.50%(a)   3.50%      2.41%(a)
                                               ======     ======     ======
  Expenses reimbursed........................    1.79%(a)   1.75%      7.96%(a)
                                               ======     ======     ======
Portfolio turnover...........................      13%       133%        99%
                                               ======     ======     ======
NET ASSETS, END OF PERIOD (IN THOUSANDS).....  $  381     $  435     $  302
                                               ======     ======     ======
Number of shares outstanding
  at end of period (in thousands)............      27         30         22
                                               ======     ======     ======
</TABLE> 

(a)  Annualized

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

+    Effective September 30, 1995, this ratio reflects total expenses before
     reduction for fees paid indirectly; such reductions are included in the
     ratio of net expenses.

**   From March 1, 1994, inception.

SEMI-ANNUAL REPORT (UNAUDITED)                      CALVERT U.S. GOVERNMENT - 11
<PAGE>
 


                      THIS PAGE INTENTIONALLY LEFT BLANK



12 - CALVERT U.S. GOVERNMENT FUND                 SEMI-ANNUAL REPORT (UNAUDITED)

<PAGE>
 
                              CALVERT INCOME FUND
                                        
Dear Shareholder:

  The first quarter of 1996 proved to be a troublesome one for bond markets
as strong economic data served to ignite investors' fears that inflation might
be heating up again.

  From July of 1995 through January 1996, the Federal Reserve embarked on a
program to stimulate the economy with a series of four cuts in short-term
interest rates. But in February and March of this year, the Labor Department
reported stronger-than-expected employment numbers. The increase in non-farm
payrolls, for example, was the largest reported in more than 12 years.

  Concerned that the economy was gathering steam, investors adjusted their
inflationary expectations higher and long-term interest rates began to rise.

  The yield on the benchmark 30-year Treasury bond rose to 6.7% by quarter's end
and bond prices, which move inversely to interest rates, dropped. Overall, the
first quarter was one of the worst on record for bonds, with long-term Treasurys
turning in a negative total return of approximately 8.5%. 

                              Treasury Yield Curve

                             [GRAPH APPEARS HERE]

Fund Performance And Strategy

  For the period covered by this report, the Fund's six-month total return of
2.38% outperformed the Lipper Corporate Debt Funds Average of 2.04%. We would
attribute this to having a more defensive position with a shorter average
maturity than our peers. As of March 31, 1996, the Fund's weighted average
maturity was 13 years.

<TABLE>
<CAPTION>
                            Investment Performance
- ---------------------------------------------------------------- 
Periods Ended 3/31/96              6 Months            12 Months
- ----------------------------------------------------------------
<S>                                <C>                 <C>
Income Fund                           2.38%               11.45%
 
Lipper
  Corp. Debt BBB
  Funds Average                       2.04%               11.72%
</TABLE>

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

SEMI-ANNUAL REPORT (UNAUDITED)                          CALVERT INCOME FUND - 1
<PAGE>
 
Outlook

  Recent economic data, particularly the unusually large number of new jobs
created during the first quarter, suggest that the economy is stronger than was
previously believed. The current unemployment rate of 5.5%, for example, is the
lowest it's been in years. Furthermore, the Federal Reserve has publicly stated
its commitment to maintaining an economic growth rate in the range of 2% to
2.5%, about where it is right now. Thus, in the near term, we do not expect the
Fed to stimulate the economy with additional cuts in interest rates. Long-term
interest rates are likely to stabilize in the near term and trade in a wide
range going forward.

  We appreciate your investment in the Calvert Income Fund.

Sincerely,

/s/ Clifton S. Sorrell

Clifton S. Sorrell
President
April 30, 1996

                        Quality Structure of Portfolio


                        NR                     3%
                        Government            40%
                        AAA/Aaa               10%
                        AA/Aa                 14%
                        A/a                   14%
                        BBB/Baa                8%
                        BB/Ba                 11%

   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.


2 - CALVERT INCOME FUND                           SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                 Portfolio Statistics
            
                   Maturity Schedule
<TABLE>
<CAPTION> 
% of Portfolio            3/31/96       9/30/95
- ------------------------------------------------
<S>                       <C>           <C>   
Less than 1 Year              15%            6%
1-5 Years                      5%           10%
5-10 Years                    38%           37%
10-20 Years                   20%           15%
20-30 Years                   20%           24%
30 Years and Above             2%            8%
  Weighted Average        3 Years      16 Years 
</TABLE>
                       SEC Yields
<TABLE>
<CAPTION> 
Thirty Days Ended         3/31/96       9/30/95    
- ------------------------------------------------
<S>                       <C>           <C> 
A Shares                    5.21%         5.56% 
C Shares                    3.23%         4.93%  
</TABLE>

                Average Annual Total Returns
              for periods ended March 31, 1996

  Class A Shares              Class C Shares
  One Year         7.28%      One Year                8.99%
  Five Years       7.90%      Since Inception (3/94)  3.15%
  Ten Years        7.59%
  
                           Performance Comparison
              Comparison of change in value of $10,000 investment

                             [GRAPH APPEARS HERE]

                      Period Between 04/01/86 to 03/31/96

                  Calvert Income Fund/Ending balance $22,861

                  Lehman Aggregate BD/Ending balance $20,791

Total returns assume reinvestment of dividends and, for Class A shares, reflect
the deduction of the Fund's maximum front-end 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 results.

SEMI-ANNUAL REPORT (UNAUDITED)                           CALVERT INCOME FUND - 3
<PAGE>


                                    Statement of Net Assets
                                         March 31, 1996 
<TABLE>
<CAPTION>
                                                                Principal
Debt Securities - 94.9%                                           Amount       Value
- ---------------------------------------------------------------------------------------
<S>                                                             <C>         <C>
U.S. Government Agency Obligations - 27.2%
Federal Farm Credit Bank Discount Note, 5.28%, 4/17/96........  $1,000,000  $   997,653
Federal Home Loan Mortgage Corp., 5.80%, 3/19/99..............   2,000,000    1,978,360
Federal Home Loan Mortgage Corp., 6.97%, 10/3/05..............   1,000,000      994,990
Federal National Mortgage Assn., 5.94%, 12/12/05..............   3,000,000    2,844,900
Federal National Mortgage Assn., 5.875%, 2/2/06...............   4,000,000    3,780,360
Small Business Administration, 8.05%, 6/1/12..................     869,101      893,541
                                                                            -----------
                                                                             11,489,804
                                                                            -----------

Mortgage Securities - 19.6%
Advanta Mortgage Loan Trust Series 1993-4, 5.50%, 3/25/10.....   1,254,588    1,198,524
Bank America National Trust & Savings, Mortgage pass-thru
 Series 1978, 9.00%, 4/5/08...................................      28,018       28,018
Federal Home Loan Mortgage Corp.:
 CMO Series A, 11.875%, 6/15/13...............................      20,082       20,713
 CMO Series 1560, 6.60%, 10/15/22.............................   1,000,000      928,350
Federal National Mortgage Assn.:
 CMO Series 1993-211 PH, 6.00%, 3/25/08.......................   1,000,000      940,430
 CMO Series 1993-122 C, 6.50%, 2/25/23........................   1,500,000    1,348,020
 7.00%, 8/1/25................................................     977,861      952,808
GMAC Mortgage Corp. of Iowa, Series 1984-18B, 11.25%, 2/1/99..      14,676       14,676
Prudential Home Mortgage Securities, 6.75%, 12/26/23..........   1,000,000      887,500
Vendee Mortgage Trust, 7.00%, 5/15/08.........................   1,000,000      989,020
Vendee Mortgage Trust, 6.75%, 4/15/22.........................   1,000,000      928,750
Washington Mutual Savings Bank, Mortgage pass-thru,
 9.00%, 5/25/08...............................................      35,259       35,260
                                                                            -----------
                                                                              8,272,069
                                                                            -----------

Corporate Bonds - 22.9%
Continental Valorem Corp. (Optional Put), 6.60%, 6/1/13.......     700,000      700,000
K-Mart Corp., 6.00%, 1/1/08...................................     315,000      268,537
Nabisco Inc., 7.05%, 7/15/07..................................   2,000,000    1,942,200
Nationwide Mutual Insurance, 7.50%, 2/15/24...................     650,000      616,401
Pacific Bell, 7.375%, 7/15/43.................................   1,000,000      953,610
Parker & Parsley Petro Co.,  8.875%, 4/15/05..................   2,000,000    2,140,760
USG Corp., 8.50%, 8/1/05......................................   2,000,000    2,050,000
Union Carbide Corp., 6.79%, 6/1/25............................   1,000,000      990,720
                                                                            -----------
                                                                              9,662,228
                                                                            -----------

Municipal Bonds - 20.6%
Arkansas Development Financial Authority CMO, 6.80%, 2/15/10..     600,000      566,424
Chickasaw Nation Oklahoma Certificate of Participation,
 10.00%, 8/1/03...............................................   1,310,000    1,355,562
Eastern Connecticut Resource Recovery Authority Revenue
 Bonds, 7.50%, 1/1/20.........................................     800,000      743,000
Gardena California Revenue VRDN, 6.35%, 7/1/25................   1,500,000    1,500,000

4 - CALVERT INCOME FUND                                  SEMI-ANNUAL REPORT (UNAUDITED)
</TABLE>

<PAGE>
 
<TABLE>
<CAPTION>
                                                                              Principal
Debt Securities (Cont'd)                                                         Amount        Value
- -------------------------------------------------------------------------------------------------------
<S>                                                                           <C>           <C>
Municipal Bonds - (Cont'd)
Iowa Financial Authority Economic Development Revenue VRDN,
 5.65%, 3/1/11..............................................................  $ 1,000,000   $ 1,000,000
Long Beach California Pension Obligation Revenue Bonds,
 7.24%, 9/1/11..............................................................    1,000,000       973,720
San Bernardino California Certificate of Participation VRDN,
 5.40%, 7/1/16..............................................................    2,000,000     2,000,000
Texas Veterans Housing Fund II General Obligation, 7.35%, 12/1/21...........      600,000       579,804
                                                                                            -----------
                                                                                              8,718,510
                                                                                            -----------
Yankee Dollar Denominated Bonds - 4.6%
Ontario Province Global Bond, 6.00%, 2/21/06................................    1,000,000       938,167
Petroliam Nasional Berhad, 7.125%, 8/15/05..................................    1,000,000     1,006,999
                                                                                            -----------
                                                                                              1,945,166
                                                                                            -----------
 
     Total Debt Securities (Cost $40,609,607)...............................                 40,087,777
                                                                                            -----------
 
Options Purchased - 0.1%
- -------------------------------------------------------------------------------------------------------
U.S. Treasury Bond June '96 Future, 40 Put Contracts, Expiration 5/18/96,
 Strike Price 110 (Premium $39,619).........................................                     43,750
                                                                                            -----------

Equity Securities - 3.4%                                                           Shares
- -------------------------------------------------------------------------------------------------------
Preferred Stocks - 3.4%
Austrailian & New Zealand Bank,  Preferred..................................       13,000       349,375
Bankers Trust NY,  Preferred................................................       15,000       376,875
ELF Overseas, Ltd., Series A,  Preferred....................................       12,500       325,000
Santander Oversea Bank, Inc., Series D, Preferred...........................       15,000       378,750
                                                                                            -----------
     Total Equity Securities (Cost $1,388,250)..............................                  1,430,000
                                                                                            -----------
     TOTAL INVESTMENTS (Cost $42,037,476) - 98.4%...........................                 41,561,527
     Other assets and liabilities, net - 1.6%...............................                    685,655
                                                                                            -----------
     Net Assets  - 100%.....................................................                $42,247,182
                                                                                            ===========
Net Assets Consist of:
- -------------------------------------------------------------------------------------------------------
Paid-in capital applicable to the following shares of beneficial interest,
 unlimited number of no par shares authorized:
  Class A: 2,445,776 shares outstanding.....................................                $40,629,921
  Class C: 83,759 shares outstanding........................................                  1,367,526
Undistributed net investment income.........................................                     37,841
Accumulated net realized gain (loss) on investments.........................                    687,843
Net unrealized appreciation (depreciation) on investments...................                   (475,949)
                                                                                            -----------
     Net assets.............................................................                $42,247,182
                                                                                            ===========
Net Asset Value Per Share
- -------------------------------------------------------------------------------------------------------
Class A (based on net assets of $40,870,756)................................                     $16.71
                                                                                            ===========
Class C (based on net assets of $1,376,426).................................                     $16.43
                                                                                            ===========
</TABLE>

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)                           CALVERT INCOME FUND - 5


                                                         
<PAGE>
 
                                    Statement of Operations

                                Six Months Ended March 31, 1996
<TABLE>
<CAPTION>
  Net Investment Income
  -----------------------------------------------------------------------------------------------
  <S>                                                                                 <C>
  Investment Income
     Interest income...........................................................       $ 1,485,984
     Dividend income (net of foreign taxes of $5,299)..........................            52,107
                                                                                      -----------
        Total investment income................................................         1,538,091
                                                                                      ----------- 

  Expenses

     Investment advisory fee...................................................           152,837
     Transfer agency fees and expenses.........................................            42,305
     Distribution Plan expenses:
        Class A................................................................            31,935
        Class C................................................................             5,440
     Trustees' fees and expenses...............................................             1,934
     Custodian fees............................................................             6,337
     Registration fees.........................................................            11,940
     Reports to shareholders...................................................            16,084
     Professional fees.........................................................             4,582
     Miscellaneous.............................................................            13,150
     Reimbursement from Advisor................................................              (33)
                                                                                      -----------
        Total expenses.........................................................           286,511
        Fees paid indirectly...................................................           (6,337)
                                                                                      ----------- 
          Net expenses.........................................................           280,174
                                                                                      -----------    
              Net Investment Income............................................         1,257,917
                                                                                      ----------- 
  Realized and Unrealized Gain (Loss) on
  Investments
  -----------------------------------------------------------------------------------------------

   Net realized gain (loss)....................................................           952,691
   Change in unrealized appreciation or depreciation...........................       (1,179,156)
                                                                                      ----------- 

              Net Realized and Unrealized Gain
              (Loss) on Investments............................................         (226,465)
                                                                                      ----------- 

              Increase (Decrease) in Net Assets
              Resulting From Operations........................................       $ 1,031,452
                                                                                      =========== 
</TABLE>


See notes to financial statements.

6 - CALVERT INCOME FUND                           SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
                           Statements of Changes in Net Assets

<TABLE>
<CAPTION>
                                                      
                                                         
                                                         Six Months
                                                            Ended        Year Ended  
                                                          March 31,     September 30,
Increase (Decrease) in Net Assets                            1996            1995    
- -------------------------------------------------------------------------------------
<S>                                                       <C>           <C>
Operations
 Net investment income (loss)..........................   $ 1,257,917   $  3,017,175
 Net realized gain (loss)..............................       952,691       (197,657)
 Change in unrealized appreciation
  or depreciation......................................    (1,179,156)     3,274,958
                                                          ------------  ------------- 
 Increase (Decrease) in Net Assets
 Resulting From Operations.............................     1,031,452      6,094,476
                                                          ------------  ------------- 
 
Distributions to shareholders from
 Net investment income:
  Class A Shares.......................................    (1,211,775)    (2,966,046)
  Class C Shares.......................................       (20,720)       (38,710)
 Net realized gain: 
  Class A Shares.......................................       (65,620)            --
  Class C Shares.......................................        (1,571)            --
                                                           ------------  ------------- 
 Total distributions...................................    (1,299,686)    (3,004,756)
                                                           ------------  ------------- 
 
Capital share transactions:
 Shares sold:
  Class A Shares........................................    2,442,001      5,198,976
  Class C Shares........................................      798,113        565,580
 Reinvestment of distributions:
  Class A Shares........................................    1,077,764      2,746,478
  Class C Shares........................................       24,634         34,511
 Shares redeemed:                                       
  Class A Shares........................................   (5,037,364)   (14,290,345)
  Class C Shares........................................     (192,324)      (291,420)
                                                          ------------  ------------- 
 Total capital share transactions.......................     (887,176)    (6,036,220)
                                                          ------------  ------------- 
 
Total Increase (Decrease) in
Net Assets..............................................   (1,155,410)    (2,946,500)
 
Net Assets
- -------------------------------------------------------------------------------------
 Beginning of period....................................   43,402,592     46,349,092
                                                          ------------  ------------- 
 End of period (including undistributed net investment
   income (loss) of $37,841 and $12,419, respectively)..  $42,247,182   $ 43,402,592
                                                          ============  ============= 
</TABLE>

See notes to financial statements.

SEMI-ANNUAL REPORT (UNAUDITED)                           CALVERT INCOME FUND - 7

<PAGE>
 
                         Notes to Financial Statements

Note A--Significant Accounting Policies

General:  The Calvert Income Fund (the "Fund"), a series of The Calvert Fund, is
registered under the Investment Company Act of 1940 as a non-diversified, open-
end management investment company. The operations of each series are accounted
for separately. The Fund 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:   Securities listed or traded on a national securities
exchange are valued at the last reported sale price. Unlisted securities and
listed securities for which the last sale price is not available are valued at
the most recent bid price or based on a yield equivalent obtained from the
securities' market maker. 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. 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.

Repurchase Agreements:  The Fund may enter into repurchase agreements with
recognized financial institutions or registered broker/dealers and, in all
instances, holds underlying securities with a value exceeding the total
repurchase price, including accrued interest.

Options:  The Fund 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. The
fund maintains liquid assets sufficient to cover, on a daily basis, the current
values of written options.

Futures Contracts:  The Fund may enter into futures contracts agreeing to buy or
sell a financial instrument for a set price at a future date. The Fund maintains
securities with a value equal to its obligation under each contract. Initial
margin deposits of either cash or securities are made upon entering in 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. Dividend income is recorded on the ex-dividend date or,
in

8 - CALVERT INCOME FUND                           SEMI-ANNUAL REPORT (UNAUDITED)
<PAGE>
 
the case of dividends on certain foreign securities, as soon as the Fund is
informed of the ex-dividend date. 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 Fund 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 Fund's capital
accounts to reflect income and gains available for distribution under income tax
regulations.

Expense Offset Arrangement:  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 a monthly fee based on an annual rate of
 .70% of the Fund's average daily net assets.

The Advisor reimburses the Fund for its operating expenses (excluding brokerage
fees, taxes, interest, Distribution Plan expenses and extraordinary items)
exceeding the following annual rates of average daily net assets: 2.5% on the
first $30 million, 2.0% on the next $70 million and 1.5% on the excess of $100
million.

Calvert Distributors, Inc., an affiliate of the Advisor, is the distributor and
principal underwriter for the Fund. Distribution Plans, adopted by each class of
shares, allow the Fund to pay the distributor for expenses and services
associated with distribution of shares. The expenses paid may not exceed .50%
and 1.0% annually of average daily net assets of each Class A and Class C,
respectively.

The Distributor received $8,427 as its portion of the commissions charged on
sales of the Fund's shares.

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.


SEMI-ANNUAL REPORT (UNAUDITED)                           CALVERT INCOME FUND - 9
<PAGE>
 
Note C--Investment Activity

During the period, purchases and sales of investments, other than short-term
securities, were $31,307,985 and $37,359,098, respectively.

The cost of investments owned at March 31, 1996 was substantially the same for
federal income tax and financial reporting purposes. Net unrealized depreciation
aggregated $475,949, of which $370,079 related to appreciated securities and
$846,028 related to depreciated securities.

Net realized capital loss carryforwards, for federal income tax purposes, of
approximately $175,000 at September 30, 1995 may be utilized to offset current
and future capital gains until expiration in 2003.


Note D--Capital Shares

Transactions in shares of beneficial interest ("capital shares") were as 
follows:

<TABLE> 
<CAPTION> 

                                                           Six Months
                                                             Ended     Year Ended
                                                           March 31,  September 30,
Share Activity                                               1996         1995
- ---------------------------------------------------------------------------------- 
<S>                                                       <C>        <C>
Class A:
 Shares sold...........................................      142,877     322,555
 Reinvestment of distributions.........................       63,573     172,149
 Shares redeemed.......................................     (295,489)   (889,362)
                                                            ---------   ---------
  Net share activity...................................      (89,039)   (394,658)
                                                            =========   =========
 
Class C:
 Shares sold...........................................       47,491      35,781
 Reinvestment of distributions.........................        1,479       2,165
 Shares redeemed.......................................      (11,454)    (18,136)
                                                            =========   =========
  Net share activity...................................       37,516      19,810
                                                            =========   =========
</TABLE> 

Note E--Subsequent Event

The shareholders of each class of the Calvert U.S. Government Fund
("Government") were asked to vote on April 26, 1996 on a merger into the Fund.
Shareholder approval was granted on May 16, 1996 to effect a tax-free exchange
of net assets of Government, Class A shares of approximately $7.7 million and
Class C shares of approximately $.3 million, for respective shares of the Fund.



10 - CALVERT INCOME FUND                          SEMI-ANNUAL REPORT (UNAUDITED)


<PAGE>

                              Financial Highlights

<TABLE>
<CAPTION>

                                                   Periods Ended
                                           --------------------------------
                                             March 31,       September 30,   
Class A Shares                                  1996         1995      1994
- ---------------------------------------------------------------------------
<S>                                         <C>          <C>       <C>
Net asset value, beginning of period....... $ 16.82      $ 15.68   $ 18.41
                                            -------      -------   ------- 

Income from investment operations
- ---------------------------------
 Net investment income.....................     .49         1.11      1.16
 Net realized and unrealized gain
  (loss) on investments....................    (.09)        1.14     (2.42)
                                            -------      -------   ------- 
  Total from investment operations.........     .40         2.25     (1.26)
                                            --------     -------   ------- 

Distributions from
- ------------------
 Net investment income.....................    (.48)       (1.11)    (1.16)
 Net realized gain.........................    (.03)          --      (.31)
                                            -------      -------   ------- 
  Total distributions......................    (.51)       (1.11)    (1.47)
                                            -------      -------   -------
Total increase (decrease) in
 net asset value...........................    (.11)        1.14     (2.73)
                                            -------      -------   ------- 
Net asset value, end of period............. $ 16.71      $ 16.82   $ 15.68
                                            -------      -------   ------- 

Total return*..............................    2.38%       14.90%    (6.94%)
                                            -------      -------   ------- 
Ratios to average net assets:
 Net investment income.....................    5.81%(a)     6.89%     6.86%
                                            -------      -------   ------- 
 Total expenses+...........................    1.26%(a)     1.26%       --
                                            -------      -------   ------- 
 Net expenses..............................    1.23%(a)     1.23%     1.07%
                                            -------      -------   ------- 
Portfolio turnover.........................      81%         135%       34%
                                            -------      -------   ------- 
Net assets, end of period (in thousands)... $40,871      $42,637   $45,936
                                            -------      -------   ------- 
Number of shares outstanding at
 end of period (in thousands)..............   2,446        2,535     2,929
                                            -------      -------   ------- 
</TABLE>

<TABLE>
<CAPTION>
                                                     Years Ended
                                           -------------------------------
                                                    September 30,
Class A Shares                                1993         1992      1991
- --------------------------------------------------------------------------
<S>                                        <C>          <C>       <C>
Net asset value, beginning of year......... $ 17.50      $ 16.61   $ 15.58
                                            -------      -------   ------- 
Income from investment operations
- ---------------------------------
 Net investment income.....................    1.23         1.28      1.31
 Net realized and unrealized gain
  (loss) on investments....................     .91          .89      1.03
                                            -------      -------   ------- 
  Total from investment operations.........    2.14         2.17      2.34
                                            -------      -------   ------- 
Distributions from
- ------------------
 Net investment income.....................   (1.23)       (1.28)    (1.31)

 Net realized gain.........................      --           --        --
                                            -------      -------   ------- 
  Total distributions......................   (1.23)       (1.28)    (1.31)
                                            -------      -------   ------- 
Total increase (decrease) in
 net asset value...........................     .91          .89      1.03
                                            -------      -------   ------- 
Net asset value, end of year............... $ 18.41      $ 17.50   $ 16.61
                                            -------      -------   ------- 

Total return*..............................   12.74%       13.66%    15.72%
                                            -------      -------   ------- 
Ratios to average net assets:
 Net investment income.....................    6.93%        7.59%     8.22%
                                            -------      -------   ------- 
 Total expenses+...........................      --           --        --
                                            -------      -------   ------- 
 Net expenses..............................    1.00%        1.04%     1.08%
                                            -------      -------   ------- 
Portfolio turnover.........................      25%          18%       27%
                                            -------      -------   ------- 
Net assets, end of year (in thousands)..... $53,134      $43,494   $36,413
                                            -------      -------   ------- 
Number of shares outstanding at
 end of year (in thousands)................   2,886        2,486     2,193
                                            -------      -------   ------- 
</TABLE>


SEMI-ANNUAL REPORT (UNAUDITED)                        CALVERT INCOME FUND - 11
<PAGE>
 
<TABLE>
<CAPTION>
                                                  Periods Ended
                                          -----------------------------
                                           March 31,     September 30,
Class C Shares                               1996       1995     1994**
- ------------------------------------------------------------------------ 

<S>                                        <C>         <C>      <C>
Net asset value, beginning of period....    $16.56      $15.63   $17.35
                                          ==========   ========  =======
Income from investment operations
- ---------------------------------
 Net investment income..................       .31         .81      .57
 Net realized and unrealized
    gain (loss) on investments..........      (.10)       1.09    (1.67)
                                          ----------   --------  -------
  Total from investment operations......       .21        1.90    (1.10)
                                          ----------   --------  -------
Distributions from
- ------------------
 Net investment income..................      (.31)       (.97)    (.62)
 Net realized gain......................      (.03)          -        -
                                          ----------   --------  -------
  Total distributions...................      (.34)       (.97)    (.62)
                                          ----------   --------  -------
Total increase (decrease) in
 net asset value........................      (.13)        .93    (1.72)
                                          ----------   --------  -------
Net asset value, end of period..........    $16.43      $16.56   $15.63
                                          ==========   ========  =======
 
Total return*...........................      1.17%      12.58%   (5.47%)
                                          ==========   ========  =======
Ratios to average net assets:
 Net investment income..................      3.68%(a)    4.71%    5.62%(a)
                                          ==========   ========  =======
 Total expenses+........................      3.42%(a)    3.37%       -
                                          ==========   ========  =======
 Net expenses...........................      3.39%(a)    3.34%    2.65%(a)
                                          ==========   ========  =======
 Expenses reimbursed....................       .01%(a)     .69%    7.29%(a)
                                          ==========   ========  =======
Portfolio turnover......................        81%        135%      34%
                                          ==========   ========  =======
Net assets, end of period (in thousands)    $1,376        $766     $413
                                          ==========   ========  =======
Number of shares outstanding at
end of period (in thousands)............        84          46       26
                                          ==========   ========  =======
</TABLE>

(a) Annualized
 *  Total return is not annualized and does not reflect deduction of Class A
    front-end sales charges.
 +  Effective September 30, 1995, this ratio reflects total expenses before
    reduction for fees paid indirectly;such reductions are included in the
    ratio of net expenses.
 ** From March 1, 1994, inception.

12 - CALVERT INCOME FUND                     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 64105-1807


                                    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.


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