CALVERT MUNICIPAL FUND INC
485BPOS, 1999-04-28
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SEC Registration Nos.
811-6525 and 33-44968


                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                  FORM N-1A

                       REGISTRATION STATEMENT UNDER THE
                            SECURITIES ACT OF 1933


                      Post-Effective Amendment No. 17 XX

                                    and/or

                       REGISTRATION STATEMENT UNDER THE
                        INVESTMENT COMPANY ACT OF 1940

                             Amendment No. 17 XX

                         Calvert Municipal Fund, Inc.
              (Exact Name of Registrant as Specified in Charter)

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

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

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


It is proposed that this filing will become effective

__ Immediately upon filing                  XX on April 30, 1999
pursuant to paragraph (b)                   pursuant to paragraph (b)

__ 60 days after filing                     __ on (date)
pursuant to paragraph (a)                   pursuant to paragraph (a)

of Rule 485.

<PAGE>

                         CALVERT MUNICIPAL FUND, INC.
                 CALVERT NATIONAL MUNICIPAL INTERMEDIATE FUND
                CALVERT CALIFORNIA MUNICIPAL INTERMEDIATE FUND
                 CALVERT MARYLAND MUNICIPAL INTERMEDIATE FUND
                 CALVERT VIRGINIA MUNICIPAL INTERMEDIATE FUND
                                  PROSPECTUS
                                April 30, 1999

About the Funds
2        Investment objective, strategy, past performance
8        Fees and Expenses
9        Principal Investment Practices and Risks

About Your Investment
14       Calvert Group and the Portfolio Management Team
14       Advisory Fees
15       How to Buy Shares
15       Getting Started
16       Distribution and Service Fees
16       Account Application
17       Important - How Shares are Priced
17       When Your Account Will be Credited
18       Other Calvert Group Features
         (Exchanges, Minimum Account Balance, etc.)
20       Dividends, Capital Gains and Taxes
22       How to Sell Shares
24       Financial Highlights
28       Exhibit A- Reduced Sales Charges
30       Exhibit B- Service Fees and
         Other Arrangements with Dealers

These securities have not been approved or disapproved by the Securities and
Exchange Commission ("SEC") or any State Securities Commission, nor has the
SEC or any State Securities Commission passed on the accuracy or adequacy of
this prospectus. Any representation to the contrary is a criminal offense.

<PAGE>

Objectives
Calvert National Municipal Intermediate Fund ("National") seeks to earn the
highest level of interest income exempt from federal income taxes as is
consistent with prudent investment management, preservation of capital, and
certain quality and maturity characteristics.

Calvert California, Maryland and Virginia Municipal Intermediate Funds (the
"State Funds") seek to earn the highest level of interest income exempt from
federal and specific state income taxes as is consistent with prudent
investment management, preservation of capital, and the quality and maturity
objectives of each Fund.

Principal investment strategies

National and the State Funds ("each Fund" or "the Funds") are each
nondiversified mutual funds.  Each Fund typically invests at least 65% of
its net assets in investment grade debt securities.  The Advisor looks for
securities with strong credit quality within their rating category that are
attractively priced.  This may include investments with unusual features or
privately placed issues, that are not widely followed in the fixed income
marketplace. The average dollar-weighted maturity will be between 3 and 10
years.

Types of investments
The Fund invests in tax-supported debt (general obligation bonds of state
and local issuers), various types of revenue debt (transportation, housing,
utilities, hospital), special tax obligations, and qualified private
activity bonds and other state and local government authorities, municipal
leases, certificates of participation in such investments. The obligations
may be structured as variable rate or adjustable rate obligations and are
often supported by a third party letter of credit.

Under normal market conditions, each Fund will invest at least 65% of its
total assets in municipal obligations whose interest is exempt from federal,
and, if a State Fund, that specific state's income tax.  The Fund will also
attempt to invest the remaining 35% of its total assets in such obligations,
but may invest it in municipal obligations of other states, territories and
possessions of the United States, the District of Columbia and their
respective authorities, agencies, instrumentalities and political
subdivisions or in short-term taxable money market-type instruments.
Dividends paid by the State Funds which are derived from interest
attributable to state municipal obligations will be exempt from federal and
that specific state's personal income taxes.  Dividends derived from
interest on tax-exempt obligations of other governmental issuers will be
exempt from federal income tax, but may be subject to state income taxes.
The interest of certain obligations may be subject to the federal
alternative minimum tax.

<PAGE>

The Funds may purchase unrated securities, so long as the Advisor determines
they are of comparable credit quality. Unrated securities may be less liquid
than those that are rated.

Principal risks
You could lose money on your investment in the Funds, or the Funds could
underperform, most likely for any of the following reasons:

o        The bond market goes down
o        The individual bonds in the Funds do not perform as well as expected
o        The Advisor's forecast as to interest rates is not correct
o        The Advisor's allocation among different sectors of the bond market
does not perform as well as expected
o        Because the State Funds invest primarily in California, Maryland,
and Virginia municipal obligations, respectively, the economy and political
climate in those states will have a great impact on the State Funds
o        The Funds are non-diversified. Compared to other funds, the Funds
may invest more of its assets in a smaller number of bonds. Gains or losses
on a single bond may have greater impact on the Funds.

An investment in the Funds is not a bank deposit and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other
government agency.

Performance Charts

The bar charts and tables below show each Fund's annual returns and its
long-term performance. The chart shows how the performance of the shares has
varied from year to year. The table compares each Fund's performance over
time to that of the Lehman Municipal 10 year Bond Index TR. This is a widely
recognized, unmanaged index of bond prices. It also shows the Fund's returns
compared to the Lipper Other States Municipal Debt Funds Index, a composite
index of the annual return of mutual funds that have an investment goal
similar to that of the Fund. Past performance does not necessarily indicate
how any Fund will perform in the future.

The bar chart does not reflect any sales charge that you may be required to
pay upon purchase or redemption of the Fund's shares. Any sales charge will
reduce your return. The average total return table shows returns with the
maximum sales charge deducted. No sales charge has been applied to the index
used for comparison in the table.

<PAGE>

National
Year-by-Year Total Return (at NAV)

Bar Chart
1993       9.47%    1996       4.32%
1994      -1.18%    1997       7.11%
1995      13.64%    1998       5.46%

Best Quarter (of periods shown)     Q1 '95    5.19%
Worst Quarter (of periods shown)    Q1 '94   -2.40%

Average Annual Total Returns (as of 12-31-98)
(with maximum sales charge deducted)

                                        1 year     5 years    Since Inception
National                                2.52%      5.10%      5.80%
(inception 9/30/92)
Lehman Municipal Bond 10 year
     Index TR                           6.11%      6.22%      7.31%
Lipper Intermediate Municipal Debt
     Funds Index                        5.62%      5.13%      5.95%

<PAGE>

California
Year-by-Year Total Return (at NAV)

Bar Chart
1993       8.88%    1996       4.04%
1994      -2.57%    1997       6.61%
1995      11.95%    1998       5.51%

Best Quarter (of periods shown)     Q1 '95    4.64%
Worst Quarter (of periods shown)    Q1 '94   -2.87%

Average Annual Total Returns (as of 12-31-98)
(with maximum sales charge deducted)

                                        1 year     5 years    Since Inception
California                              2.61%      4.34%      5.46%
(inception 5/29/92)
Lehman Municipal Bond 10 year
     Index TR                           6.11%      6.22%      7.68%
Lipper California Intermediate Municipal
     Debt Funds Average                 5.33%      5.43%      7.02%

The month end date of 5/31/92 is used for comparison purposes only, actual
inception is 5/29/92

<PAGE>

Maryland
Year-by-Year Total Return (at NAV)

Bar Chart
1994      -2.94%    1997       7.68%
1995      13.66%    1998       4.88%
1996       3.96%

Best Quarter (of periods shown)     Q1 '95    5.40%
Worst Quarter (of periods shown)    Q1 '94   -3.51%

Average Annual Total Returns (as of 12-31-98)
(with maximum sales charge deducted)

                                        1 year     5 years    Since Inception
Maryland                                1.93%      4.65%      4.79%
(inception 9/30/93)
Lehman Municipal Bond 10 year
     Index TR                           6.11%      6.22%      6.21%
Lipper Other States Municipal Debt
     Funds Average                      5.08%      4.72%      4.69%

<PAGE>

Virginia
Year-by-Year Total Return (at NAV)

Bar Chart
1994      -2.04%    1997       6.71%
1995      13.78%    1998       4.88%
1996       3.82%

Best Quarter (of periods shown)     Q1 '95    5.80%
Worst Quarter (of periods shown)    Q1 '94   -2.95%

Average Annual Total Returns (as of 12-31-98)
(with maximum sales charge deducted)

                                        1 year     5 years    Since Inception
Virginia                                1.94%      4.65%      4.84%
(inception 10/1/93)
Lehman Municipal Bond 10 year
     Index TR                           6.11%      6.22%      6.21%
Lipper Other States Municipal Debt
     Funds Average                      5.05%      4.61%      4.69%

<PAGE>

FEES AND EXPENSES

Shareholder Fees
(fees paid directly from your investment)
                                                     National

Maximum sales charge (load)                          2.75%
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)                 None1
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses
(expenses that are deducted from Fund assets)

Management fees                                      0.70%
Distribution and service (12b-1) fees                0.00%
Other expenses2                                      0.29%
Total annual fund operating expenses                 0.99%

Shareholder Fees
(fees paid directly from your investment)
                                                     California

Maximum sales charge (load)                          2.75%
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)                 None1
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses
(expenses that are deducted from Fund assets)

Management fees                                      0.70%
Distribution and service (12b-1) fees                0.00%
Other expenses2                                      0.22%
Total annual fund operating expenses                 0.92%

Shareholder Fees
(fees paid directly from your investment)
                                                     Maryland

Maximum sales charge (load)                          2.75%
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)                 None1
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses
(expenses that are deducted from Fund assets)

Management fees                                      0.70%
Distribution and service (12b-1) fees                0.00%
Other expenses2                                      0.29%
Total annual fund operating expenses                 0.99%

Shareholder Fees
(fees paid directly from your investment)
                                                     Virginia

Maximum sales charge (load)                          2.75%
     imposed on purchases
     (as a percentage of offering price)
Maximum deferred sales charge (load)                 None1
     (as a percentage of purchase or redemption
     proceeds, whichever is lower)

Annual fund operating expenses
(expenses that are deducted from Fund assets)

Management fees                                      0.70%
Distribution and service (12b-1) fees                0.00%
Other expenses2                                      0.29%
Total annual fund operating expenses                 0.99%

Explanation of Fees and Expenses Table

1 Purchases of shares for accounts with $1 million or more are not subject
to front-end sales charges, but may be subject to a 1.0% contingent deferred
sales charge on shares redeemed within 1 year of purchase. (See "How to Buy
Shares)
2 Expenses have been restated to reflect expenses expected to be incurred in
1999.

<PAGE>

Annual Fund Operating Expenses
Expenses are based on expenses for each Fund's most recent fiscal year,
unless otherwise indicated. Management fees include the administrative fee
paid by the Fund to Calvert Administrative Services Company, an affiliate of
the Advisor, Calvert Asset Management Company, Inc.

Rule 12b-1 fees include an asset-based sales charge. Thus, long-term
shareholders in those Funds with such fees may pay more in total sales
charges than the economic equivalent of the maximum front-end sales charge
permitted by rules of the National Association of Securities Dealers, Inc.

Example
This example is intended to help you compare the cost of investing in a Fund
with the cost of investing in other mutual funds. The example assumes that:
You invest $10,000 in a Fund for the time periods indicated;
Your investment has a 5% return each year; and
The Fund's operating expenses remain the same.

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

                      Number of Years Investment is Held
Fund                  1 year        3 years      5 years      10 years
National              $373          $582         $807         $1,455
California            $366          $560         $770         $1,375
Maryland              $373          $582         $807         $1,455
Virginia              $373          $582         $807         $1,455

Principal Investment Practices and Risks

The most concise description of each Fund's principal investment strategies
and associated risks is under the earlier summary for each Fund. The Funds
are also permitted to invest in certain other investments and to use certain
investment techniques that have higher risks associated with them. On the
following pages are brief descriptions of the investments and techniques,
summarized in the earlier summary along with certain additional investment
techniques and their risks.

For each of the investment practices listed, the table below shows each
Fund's limitations as a percentage of its assets and the principal types of
risk involved. (See the pages following the table for a description of the
types of risks.) Numbers in this table show maximum allowable amount only;
for actual usage, consult the Fund's annual/semi-annual reports.

<PAGE>

Key to Table
@        Fund currently uses
0        Permitted, but not typically used
(% of assets allowable, if restricted)
- --       Not permitted
xN       Allowed up to x% of fund's net assets
xT       Allowed up to x% of Fund's total assets
NA       Not applicable to this type of fund

                                          Nat'l.   CA       MD       VA
- ------------------------------------------ -------- -------- -------- -------
Conventional Securities:

Investment grade bonds. Bonds rated        @        @        @        @
BBB/Baa or higher or comparable unrated
bonds. Risks: Interest Rate, Market ,
Credit and Information.
- ------------------------------------------ -------- -------- -------- -------

- ------------------------------------------ -------- -------- -------- -------
Below-investment grade bonds. Bonds        @        @        @        @
rated below BBB/Baa or comparable          35N      35N      35N      35N
unrated bonds, also known as high-yield
bonds. They are subject to greater
credit risk than investment grade bonds.
Risks: Credit, Market, Interest Rate,
Liquidity and Information.
- ------------------------------------------ -------- -------- -------- -------

- ------------------------------------------ -------- -------- -------- -------
Unrated debt securities. Bonds that have   @        @        @        @
not been rated by a recognized rating
agency; the Advisor has determined the
credit quality based on its own
research. Risks: Credit, Market,
Interest Rate, Liquidity and
Information.
- ------------------------------------------ -------- -------- -------- -------

- ------------------------------------------ -------- -------- -------- -------
Illiquid securities. Securities which      15N      15N      15N      15N
cannot be readily sold because there is
no active market. Risks: Liquidity,
Market and Transaction.
- ------------------------------------------ -------- -------- -------- -------

<PAGE>

Unleveraged derivative securities
- ------------------------------------------ -------- -------- -------- -------
Asset-backed securities. Securities are    @        @        @        @
issued by a special purpose entity and
are backed by fixed-income or other
interest bearing assets.  Risks: Credit,
Interest Rate and Liquidity.
- ------------------------------------------ -------- -------- -------- -------

- ------------------------------------------ -------- -------- -------- -------
Mortgage-backed securities (typically,
single-family mortgage bonds).             @        @        @        @
Securities are backed by pools of
mortgages, including passthrough
certificates.  Risks: Credit, Extension,
Prepayment, Liquidity and Interest Rate.
- ------------------------------------------ -------- -------- -------- -------

Leveraged derivative instruments
- ------------------------------------------ -------- -------- -------- -------
Options on securities and indices.         5T       5T       5T       5T
Contracts giving the holder the right
but not the obligation to purchase or
sell a security (or the cash value, in
the case of an option on an index) at a
specified price within a specified time.
Any options written by the Fund must be
"covered". The limitation is based on
net premium payments. Risks: Interest
Rate, Market, Leverage, Correlation,
Liquidity, Credit and Opportunity.
- ------------------------------------------ -------- -------- -------- -------

- ------------------------------------------ -------- -------- -------- -------
Futures contract. Agreement to buy or      5N       5N       5N       5N
sell a specific amount of a commodity or
financial instrument at a particular
price on a specific future date. Risks:
Interest Rate, Market, Leverage,
Correlation, Liquidity and Opportunity.
- ------------------------------------------ -------- -------- -------- -------

- ------------------------------------------ -------- -------- -------- -------
Structured securities. Inverse floating    @        @        @        @
rate municipal notes and bonds.  These
securities tend to be highly sensitive
to interest rate movements.  Risks:
Credit, Interest Rate, Market, Leverage,
Liquidity and Correlation.
- ------------------------------------------ -------- -------- -------- -------

<PAGE>

- ------------------------------------------ -------- -------- -------- -------
Temporary Defensive Positions.             @        @        @        @
During adverse market, economic or
political conditions, the Fund may
depart from its principal investment
strategies by increasing its investment
in U.S. government securities and other
short-term interest-bearing securities.
During times of any temporary defensive
positions, a Fund may not be able to
achieve its investment objective Risks:
Opportunity.
- ------------------------------------------ -------- -------- -------- -------

The Funds have additional investment policies and restrictions that are not
principal to their investment strategies (for example, repurchase
agreements, borrowing, pledging, and securities lending, and when-issued
securities.) These policies and restrictions are discussed in the SAI.

Correlation risk
This occurs when a Fund "hedges"- uses one investment to offset the Fund's
position in another. If the two investments do not behave in relation to one
another the way Fund managers expect them to, then unexpected or undesired
results may occur. For example, a hedge may eliminate or reduce gains as
well as offset losses.

Credit risk
The risk that the issuer of a security or the counterparty to an investment
contract may default or become unable to pay its obligations when due.

Extension risk
The risk that an unexpected rise in interest rates will extend the life of a
mortgage-backed security beyond the expected prepayment time, typically
reducing the security's value.

Information risk
The risk that information about a security or issuer or the market might not
be available, complete, accurate or comparable.

Interest rate risk
The risk that changes in interest rates will adversely affect the value of
an investor's securities. When interest rates rise, the value of
fixed-income securities will generally fall. Conversely, a drop in interest
rates will generally cause an increase in the value of fixed-income
securities. Longer-term securities and zero coupon/"stripped" coupon
securities ("strips") are subject to greater interest rate risk.

<PAGE>

Leverage risk
The risk that occurs in some securities or techniques which tend to magnify
the effect of small changes in an index or a market. This can result in a
loss that exceeds the amount actually invested.

Liquidity risk
The risk that occurs when investments cannot be readily sold. A Fund may
have to accept a less-than-desirable price to complete the sale of an
illiquid security or may not be able to sell it at all.

Management risk
This means that a Fund's portfolio management practices might not work to
achieve their desired result.

Market risk
This means the risk that securities prices in a market, a sector or an
industry will fluctuate, and that such movements might reduce an
investment's value.

Opportunity risk
The risk of missing out on an investment opportunity because the assets
needed to take advantage of it are committed to less advantageous
investments or strategies.

Political risk
The risk that may occur with foreign investments, and means that the value
of an investment may be adversely affected by nationalization, taxation,
war, government instability or other economic or political actions or
factors.

Prepayment risk
The risk that unanticipated prepayments may occur, reducing the value of a
mortgage-backed security. The Fund must then reinvest those assets at the
current, market rate which may be lower.

Transaction risk
The risk that a Fund may be delayed or unable to settle a transaction or
that commissions and settlement expenses may be higher than usual.

<PAGE>

About Calvert Group
Calvert Asset Management Company, Inc. (4550 Montgomery Avenue, Suite 1000N,
Bethesda, MD 20814) ("CAMCO") is the Funds' investment advisor and provides
day-to-day investment management services to the Funds. It has been managing
mutual funds since 1976. CAMCO is the investment advisor for over 25 mutual
funds. As of December 31, 1998, CAMCO had $6 billion in assets under
management.

CAMCO uses a team approach to its management of the Fund. Since inception,
investment selections for the Fund have been made by Reno J. Martini and
Daniel K. Hayes. Mr. Martini, Senior Vice President and Chief Investment
Officer of CAMCO, oversees the investment management of all Calvert Funds
for CAMCO. Mr. Martini has over 18 years of experience in evaluating and
purchasing municipal securities and has been the head of CAMCO's asset
management team since 1985. Mr. Hayes serves as head of Portfolio Research
and has been a portfolio manager for CAMCO since 1984. He is a Vice
President of CAMCO, and is an officer of each of the other investment
companies in the Calvert Group of Funds, except for Calvert New World Fund,
Inc.

Advisory Fees

The aggregate annual advisory fee paid to CAMCO by the Funds for the most
recent fiscal year as a percentage of each Fund's average daily net assets
was 0.60%.

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

Like other mutual funds, CAMCO and its service providers use computer
systems for all aspects of our business -- processing shareholder and fund
transactions, fund accounting, executing trades, and pricing securities just
to name a few. Many current software programs cannot distinguish between the
year 2000 and the year 1900. This can cause problems with retirement plan
distributions, dividend payment software, transaction software, and numerous
other areas that could impact the Funds. Calvert Group has been reviewing
all of its computer systems for Y2K compliance. Although, at this time,
there can be no assurance that there will be no negative impact on the
Funds, the Advisor, the underwriter, transfer agent and custodian have
advised the Funds that they have been actively working on any necessary
changes to their computer systems to prepare for Y2K and expect that their
systems, and those of their outside service providers, will be adapted in
time for that event. For more information, please visit our website at
www.calvertgroup.com.

<PAGE>

HOW TO BUY SHARES

Getting Started - Before You Open an Account
You have a few decisions to make before you open an account in a mutual fund.

First, decide which fund or funds best suits your needs and your goals.

Second, decide what kind of account you want to open. Calvert offers
individual, joint, trust, Uniform Gift/Transfer to Minor Accounts, and
several other types of accounts.

Sales Charges
Each Fund has a front-end sales charge. This table shows the charges both as
a percentage of offering price and as a percentage of the amount you invest.
The term "offering price" means the net asset value plus the front-end sales
charge. If you invest more, the sales charge will be lower. For example, if
you invest more than $50,000, or if your cumulative purchases or the value
in your account is more than $50,000,3 then the sales charge is reduced to
2.25%.

Your investment                           Sales Charge %      % of Amt.
in shares                                 of offering price   invested
Less than $50,000                         2.75%               2.83%
$50,000 but less than $100,000            2.25%               2.30%
$100,000 but less than $250,000           1.75%               1.78%
$250,000 but less than $500,000           1.25%               1.27%
$500,000 but less than $1,000,000         1.00%               1.01%
$1,000,000 and over                       None*               None*

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

* Purchases of shares at net asset value for accounts with $1,000,000 or
more are subject to a one year contingent deferred sales charge ("CDSC") of
1.00%. See the "Calculation of Contingent Deferred Sales Charge and Waiver
of Sales Charges."

The front-end sales charge may be waived for certain purchases or investors,
such as participants in certain group retirement plans or other qualified
groups and clients of registered investment advisers. For details on these
and other purchases that may qualify for a reduced sales charge, see Exhibit
A.

<PAGE>

Calculation of Contingent Deferred Sales Charge and Waiver of Sales Charges
The CDSC will not be charged on shares you received as dividends or from
capital gains distributions or on any capital appreciation (gain in the
value) of shares that are sold.

Shares that are not subject to the CDSC will be redeemed first, followed by
shares you have held the longest. The CDSC is calculated by determining the
share value at both the time of purchase and redemption and then multiplying
whichever value is less by the percentage that applies as shown above. If
you choose to sell only part of your shares, the capital appreciation for
those shares only is included in the calculation, rather than the capital
appreciation for the entire account.

Distribution and Service Fees
The Funds have adopted a plan under Rule 12b-1 of the Investment Company Act
of 1940 that allows each Fund to pay distribution fees for the sale and
distribution of its shares. The distribution plan also pays service fees to
persons (such as your financial professional) for services provided to
shareholders. Because these fees are paid out of a Fund's assets on an
ongoing basis, over time, these fees will increase the cost of your
investment and may cost you more than paying other types of sales charges.
Please see Exhibit B for more service fee information.

The maximum annual percentage payable under each Fund's distribution plan
totals 0.25%, based on average daily net assets of each Fund.

Next Step - Account Application

Complete and sign an application for each new account. When multiple classes
of shares are offered, please specify which class you wish to purchase. For
more information, contact your broker or our shareholder services department
at 800-368-2748.

Minimum To Open an Account                  Minimum additional
$2,000                                      investments -$250

Please make your check payable
to the Fund and mail it to:
              New Accounts                  Subsequent Investments
              (include application)         (include investment slip)
              Calvert Group                 Calvert Group
              P.O. Box 419544               P.O. Box 419739
              Kansas, City MO               Kansas City, MO
              64141-6544                    64141-6739

<PAGE>

By Registered,                 Calvert Group
Certified, or                  c/o NFDS,
Overnight Mail                 330 West 9th St.
                               Kansas City, MO 64105-1807

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

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

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

The NAV is calculated as of the close of each business day, which coincides
with the closing of the regular session of the New York Stock Exchange
("NYSE") (normally 4 p.m. ET). Each Fund is open for business each day the
NYSE is open. Please note that there are some federal holidays, however,
such as Columbus Day and Veterans' Day, when the NYSE is open and the Fund
is open but purchases cannot be made because the post offices and banks are
closed.

When Your Account Will Be Credited
Before you buy shares, please read the following information to make sure
your investment is credited properly and in a timely manner.

o        Your purchase will be processed at the NAV next calculated after
your order is received.
o        All of your purchases must be made in US dollars.
o        No cash will be accepted.
o        No credit card or credit loan checks will be accepted.
o        Each Fund reserves the right to suspend the offering of shares for
a period of time or to reject any specific purchase order.
o        As a convenience, check purchases received at Calvert's office in
Bethesda, Maryland will be sent by overnight delivery to the Transfer Agent
and will be credited the next business day upon receipt.

<PAGE>

o        Any check purchase received without an investment slip may cause
delayed crediting.
o        If your check does not clear your bank, your purchase will be
canceled and you will be charged a $10 fee plus any costs incurred.
o        All purchases will be confirmed and credited to your account in
full and fractional shares (rounded to the nearest 1/100th of a share).

Earning Dividends
If the Transfer Agent receives your wire purchase by 5 p.m. ET, your account
will begin earning dividends on the next business day. Exchanges begin
earning dividends the next business day after the exchange request is
received by mail or telephone. Purchases received by check will begin
earning dividends the next business day after they are credited to the
account.

OTHER CALVERT GROUP FEATURES

CALVERT INFORMATION NETWORK
For 24 hour performance and account information call 800-368-2745 or visit
http://www.calvertgroup.com
You can obtain current performance and pricing information, verify account
balances, and authorize certain transactions with the convenience of one
phone call, 24 hours a day.

ACCOUNT SERVICES
By signing up for services when you open your account, you avoid having to
obtain a signature guarantee. If you wish to add services at a later date, a
signature guarantee to verify your signature may be obtained from any bank,
trust company and savings and loan association, credit union, broker-dealer
firm or member of a domestic stock exchange. A notary public cannot provide
a signature guarantee.

CALVERT MONEY CONTROLLER
Calvert Money Controller allows you to purchase or sell shares by electronic
funds transfer without the time delay of mailing a check or the added
expense of a wire. Use this service to transfer up to $300,000
electronically. Allow one or two business days after you place your request
for the transfer to take place. Money transferred to purchase new shares
will be subject to a hold of up to 10 business days. Transaction requests
must be received by 4 p.m. ET. You may request this service on your initial
account application. Calvert Money Controller transactions returned for
insufficient funds will incur a $25 charge.

<PAGE>

TELEPHONE TRANSACTIONS
You may purchase, redeem, or exchange shares, wire funds and use Calvert
Money Controller by telephone if you have pre-authorized service
instructions. You receive telephone privileges automatically when you open
your account unless you elect otherwise. For our mutual protection, the
Fund, the shareholder servicing agent and their affiliates use precautions
such as verifying shareholder identity and recording telephone calls to
confirm instructions given by phone. A confirmation statement is sent for
most transactions; please review this statement and verify the accuracy of
your transaction immediately.

EXCHANGES
Calvert Group offers a wide variety of investment options that includes
common stock funds, tax-exempt and corporate bond funds, and money market
funds (call your broker or Calvert representative for more information). We
make it easy for you to purchase shares in other Calvert funds if your
investment goals change. The exchange privilege offers flexibility by
allowing you to exchange shares on which you have already paid a sales
charge from one mutual fund to another at no additional charge.

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

Before you make an exchange, please note the following:
Each exchange represents the sale of shares of one Fund and the purchase of
shares of another. Therefore, you could realize a taxable gain or loss.

You may exchange shares acquired by reinvestment of dividends or
distributions into another Calvert Fund at no additional charge.

Shares may only be exchanged for shares of the same class of another Calvert
Fund.

No CDSC is imposed on exchanges of shares subject to a CDSC at the time of
the exchange. The applicable CDSC is imposed at the time the shares acquired
by the exchange are redeemed.

Shareholders (and those managing multiple accounts) who make two purchases
and two redemptions of shares of the same Fund during any six-month period
will be given written notice and may be prohibited from placing additional
investments. This policy does not prohibit a shareholder from redeeming
shares of any Fund, and does not apply to trades solely between money market
funds.

<PAGE>

Each Fund reserves the right to terminate or modify the exchange privilege
with 60 days' written notice.

COMBINED GENERAL MAILINGS (Householding)
Multiple accounts with the same social security number will receive one
mailing per household of information such as prospectuses and semi-annual
and annual reports. You may request further grouping of accounts to receive
fewer mailings. Separate statements will be generated for each separate
account and will be mailed in one envelope for each combination above.

Special Services and Charges
Each Fund pays for shareholder services but not for special services that
are required by a few shareholders, such as a request for a historical
transcript of an account. You may be required to pay a fee for these special
services.

If you are purchasing shares through a program of services offered by a
broker/dealer or financial institution, you should read the program
materials together with this Prospectus. Certain features may be modified in
these programs. Investors may be charged a fee if they effect transactions
in Fund shares through a broker or agent.

MINIMUM ACCOUNT BALANCE
Please maintain a balance in each of your accounts of at least $1,000. If
the balance in any of your accounts falls below the minimum during a month,
your account may be closed and the proceeds mailed to the address of record.
You will receive notice that your account is below the minimum, and will be
closed if the balance is not brought up to the required minimum amount
within 30 days.

DIVIDENDS, CAPITAL GAINS AND TAXES

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

Dividend Payment Options
Dividends and any distributions are automatically reinvested in the same
Fund at NAV (without sales charge), unless you elect to have amounts of $10
or more paid in cash (by check or by Calvert Money Controller). Dividends
and distributions from any Calvert Group Fund may be automatically invested
in an

<PAGE>

identically registered account in any other Calvert Group Fund at NAV. If
reinvested in the same account, new shares will be purchased at NAV on the
reinvestment date, which is generally 1 to 3 days prior to the payment date.
You must notify the Fund in writing to change your payment options. If you
elect to have dividends and/or distributions paid in cash, and the US Postal
Service returns the check as undeliverable, it, as well as future dividends
and distributions, will be reinvested in additional shares. No dividends
will accrue on amounts represented by uncashed distribution or redemption
checks.

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

Federal Taxes
Dividends derived from interest on municipal obligations constitute
exempt-interest dividends, on which you are not subject to federal income
tax. However, dividends which are from taxable interest and any
distributions of short term capital gain are taxable to you as ordinary
income. If the Fund makes any distributions of long-term capital gains, then
these are taxable to you as long-term capital gains, regardless of how long
you held your shares of the Fund. Dividends attributable to interest on
certain private activity bonds must be included in federal alternative
minimum tax for individuals and for corporations. Each Fund may invest in
and derive income from taxable short-term money market investments, for
liquidity purposes or pending investment of the new assets (20% for National
and California, 35% for Maryland and Virginia). Interest earned from taxable
investments will be taxable as ordinary income.

If any taxable income or gains are paid, in January, your Fund will mail you
Form 1099-DIV indicating the federal tax status of dividends and any capital
gain distributions paid to you during the past year. Generally, dividends
and distributions are taxable in the year they are paid. However, any
dividends and distributions paid in January but declared during the prior
three months are taxable in the year declared. Dividends and distributions
are taxable to you regardless of whether they are taken in cash or
reinvested.

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

<PAGE>

Other Tax Information - State Funds Only
Dividends derived from interest on specific state or local obligations are
exempt from that state's personal income tax, as are dividends from
obligations issued by certain territories, such as Puerto Rico. Your State
Fund will advise you each January of the percent of dividends qualifying for
this exemption. You should consult your tax advisor with regard to how
certain dividends affect you.

Taxpayer Identification Number
If we do not have your correct Social Security or Taxpayer Identification
Number ("TIN") and a signed certified application or Form W-9, Federal law
requires us to withhold 31% of your reportable dividends, and possibly 31%
of certain redemptions. In addition, you may be subject to a fine by the
Internal Revenue Service. You will also be prohibited from opening another
account by exchange. If this TIN information is not received within 60 days
after your account is established, your account may be redeemed (closed) at
the current NAV on the date of redemption. Calvert Group reserves the right
to reject any new account or any purchase order for failure to supply a
certified TIN.

HOW TO SELL SHARES

You may redeem all or a portion of your shares on any day each Fund is open
for business, provided the amount requested is not on hold. When you
purchase by check or with Calvert Money Controller (electronic funds
transfer), the purchase will be on hold for up to 10 business days from the
date of receipt. During the hold period, redemption proceeds will not be
sent until the Transfer Agent is reasonably satisfied that the purchase
payment has been collected.

Your shares will be redeemed at the NAV next calculated after your
redemption request is received and accepted (less any applicable CDSC). The
proceeds will normally be sent to you on the next business day, but if
making immediate payment could adversely affect the Fund, it may take up to
seven (7) days to make payment. Calvert Money Controller redemptions
generally will be credited to your bank account by the second business day
after your phone call. When the NYSE is closed (or when trading is
restricted) for any reason other than its customary weekend or holiday
closings, or under any emergency circumstances as determined by the
Securities and Exchange Commission, redemptions may be suspended or payment
dates postponed. Please note that there are some federal holidays, however,
such as Columbus Day and Veterans' Day, when the NYSE is open and the Fund
is open but redemptions cannot be made because the post offices and banks
are closed.

The Fund has the right to redeem shares in assets other than cash for
redemption amounts exceeding, in any 90-day period, $250,000 or 1% of the
net asset value of the Fund, whichever is less.

<PAGE>

Follow these suggestions to ensure timely processing of your redemption
request:

By Telephone - Call 800.368.2745
You may redeem shares from your account by telephone and have your money
mailed to your address of record or electronically transferred or wired to a
bank you have previously authorized. A charge of $5 may be imposed on wire
transfers of less than $1,000.

Written Requests
Calvert Group, P.O. Box 419544, Kansas City, MO 64141-6544
Your letter should include your account number and fund and the number of
shares or the dollar amount you are redeeming. Please provide a daytime
telephone number, if possible, for us to call if we have questions. If the
money is being sent to a new bank, person, or address other than the address
of record, your letter must be signature guaranteed.

Systematic Check Redemptions
If you maintain an account with a balance of $10,000 or more, you may have
up to two (2) redemption checks for a fixed amount sent to you on the 15th
of the month, simply by sending a letter with all information, including
your account number, and the dollar amount ($100 minimum). If you would like
a regular check mailed to another person or place, your letter must be
signature guaranteed. Shares subject to the one-year CDSC which are redeemed
by Systematic Check Redemption will be charged the CDSC.

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

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

Through your Dealer
Your dealer must receive your request before the close of regular trading on
the NYSE to receive that day's NAV. Your dealer will be responsible for
furnishing all necessary documentation to Calvert Group and may charge you
for services provided.

<PAGE>

FINANCIAL HIGHLIGHTS

The financial highlights table is intended to help you understand the Funds'
financial performance for the past 5 years. Information reflects financial
results for a single share, by Fund. The total returns in the table
represent the rate that an investor would have earned (or lost) on an
investment in a Fund (assuming reinvestment of all dividends and
distributions), and does not reflect any applicable front- or back-end sales
charge. This information has been audited by PricewaterhouseCoopers LLP,
whose report, along with a Fund's financial statements, are included in the
Fund's annual report, which is available upon request.

NATIONAL
                                             Years Ended
                            December 31,      December 31,     December 31,
                                    1998              1997             1996
Net asset value, beginning        $10.79            $10.56           $10.62
Income from investment operations
     Net investment income           .45               .50              .50
     Net realized and unrealized
         gain (loss)                 .13               .23            (.06)

Total from investment operations     .58               .73              .44
Distributions from
     Net investment income         (.46)             (.50)            (.50)
     Net realized gains            (.09)                --               --

Total distributions                (.55)             (.50)            (.50)
Total increase (decrease) in
     net asset value                 .03               .23            (.06)
Net asset value, ending           $10.82            $10.79           $10.56

Total return *                     5.46%             7.11%            4.32%
Ratios to average net assets:
     Net investment income         4.17%             4.71%            4.83%
     Total expenses +               .97%              .97%            1.04%
     Net expenses                   .94%              .94%            1.01%
Portfolio turnover                   44%               29%              23%
Net assets, ending
     (in thousands)              $71,065           $48,933          $45,612
Number of shares outstanding,
     ending (in thousands)         6,570             4,535            4,319

                                                     Years Ended
                                              December 31,     December 31,
                                                      1995             1994
Net asset value, beginning                           $9.81           $10.42
Income from investment operations
     Net investment income                             .51              .50
     Net realized and unrealized gain (loss)           .80            (.62)

Total from investment operations                      1.31            (.12)
Distributions from
     Net investment income                           (.50)            (.49)
     Net realized gains                                 --               --

Total distributions                                  (.50)            (.49)
Total increase (decrease) in net asset value           .81            (.61)
Net asset value, ending                             $10.62            $9.81

Total return *                                      13.64%          (1.18%)
Ratios to average net assets:
     Net investment income                           4.97%            4.88%
     Total expenses +                                 .96%               --
     Net expenses                                     .94%             .69%
     Expenses reimbursed                                --             .32%
Portfolio turnover                                     57%             122%
Net assets, ending (in thousands)                  $40,146          $36,159
Number of shares outstanding,
     ending (in thousands)                           3,780            3,686

<PAGE>

CALIFORNIA
                                             Years Ended
                            December 31,      December 31,     December 31,
                                    1998              1997             1996
Net asset value, beginning        $10.63            $10.44           $10.51
Income from investment operations
     Net investment income           .45               .49              .48
     Net realized and unrealized
         gain (loss)                 .12               .18            (.07)

Total from investment operations     .57               .67              .41
Distributions from
     Net investment income         (.46)             (.48)            (.48)
Total increase (decrease) in
     net asset value                 .11               .19            (.07)
Net asset value, ending           $10.74            $10.63           $10.44

Total return *                     5.51%             6.61%            4.04%
Ratios to average net assets:
     Net investment income         4.23%             4.64%            4.59%
     Total expenses +               .90%              .91%             .97%
     Net expenses                   .88%              .88%             .94%
Portfolio turnover                   12%               48%              25%
Net assets, ending
     (in thousands)              $36,963           $35,085          $35,693
Number of shares outstanding,
     ending (in thousands)         3,442             3,300            3,419

                                                      Years Ended
                                              December 31,     December 31,
                                                      1995             1994
Net asset value, beginning                           $9.81           $10.56
Income from investment operations
     Net investment income                             .47              .48
     Net realized and unrealized gain (loss)           .69            (.76)

Total from investment operations                      1.16            (.28)
Distributions from
     Net investment income                           (.46)            (.47)
     Net realized gains                                 --               --
     Total distributions                             (.46)            (.47)
Total increase (decrease) in net asset value           .70            (.75)
Net asset value, ending                             $10.51            $9.81

Total return *                                      12.07%          (2.57%)
Ratios to average net assets:
     Net investment income                           4.59%            4.67%
     Total expenses +                                 .91%               --
     Net expenses                                     .89%             .76%
     Expenses reimbursed                                --             .13%
Portfolio turnover                                     47%              68%
Net assets, ending (in thousands)                  $34,424          $34,111
Number of shares outstanding,
     ending (in thousands)                           3,276            3,476

<PAGE>

MARYLAND
                                             Years Ended
                            December 31,      December 31,     December 31,
                                    1998              1997             1996
Net asset value, beginning         $5.18             $5.03            $5.06
Income from investment operations
     Net investment income           .21               .23              .23
     Net realized and unrealized
         gain (loss)                 .04               .15            (.04)

Total from investment operations     .25               .38              .19
Distributions from
     Net investment income         (.22)             (.23)            (.22)
Total increase (decrease) in
     net asset value                 .03               .15            (.03)
Net asset value, ending            $5.21             $5.18            $5.03

Total return *                     4.88%             7.68%            3.96%
Ratios to average net assets:
     Net investment income         4.13%             4.48%            4.59%
     Total expenses +               .97%              .99%            1.00%
     Net expenses                   .93%              .92%             .94%
     Expenses reimbursed              --                --             .04%
Portfolio turnover                   24%               13%               8%
Net assets, ending
     (in thousands)              $12,165           $12,437          $12,023
Number of shares outstanding,
     ending (in thousands)         2,336             2,400            2,338

                                                     Years Ended
                                              December 31,     December 31,
                                                      1995             1994
Net asset value, beginning                           $4.67            $5.05
Income from investment operations
     Net investment income                             .24              .24
     Net realized and unrealized gain (loss)           .39            (.39)

Total from investment operations                       .63            (.15)
Distributions from
     Net investment income                           (.24)            (.23)
Total increase (decrease) in net asset value           .39            (.38)
Net asset value, ending                              $5.06            $4.67

Total return *                                      13.66%          (2.94%)
Ratios to average net assets:
     Net investment income                           4.87%            5.01%
     Total expenses +                                 .51%               --
     Net expenses                                     .48%             .17%
     Expenses reimbursed                              .43%             .86%
Portfolio turnover                                     11%              77%
Net assets, ending (in thousands)                   $9,411           $7,429
Number of shares outstanding,
     ending (in thousands)                           1,860            1,589

<PAGE>

VIRGINIA

                                              Periods Ended
                            December 31,      December 31,     December 31,
                                    1998              1997             1996
Net asset value, beginning         $5.21             $5.10            $5.13
Income from investment operations
     Net investment income           .21               .22              .22
     Net realized and unrealized
         gain (loss)                 .04               .11            (.03)

Total from investment operations     .25               .33              .19
Distributions from
     Net investment income         (.21)             (.22)            (.22)
Total increase (decrease) in
     net asset value                 .04               .11            (.03)
Net asset value, ending            $5.25             $5.21            $5.10

Total return*                      4.88%             6.71%            3.82%
Ratios to average net assets:
     Net investment income         4.03%             4.38%            4.35%
     Total expenses +               .97%              .96%            1.00%
     Net expenses                   .93%              .88%             .92%
     Expenses reimbursed              --                --             .03%
Portfolio turnover                   36%                8%               4%
Net assets, ending
     (in thousands)              $14,439           $13,542          $12,618
Number of shares outstanding,
     ending (in thousands)         2,748             2,602            2,475

                                                     Years Ended
                                              December 31,     December 31,
                                                      1995             1994
Net asset value, beginning                           $4.74            $5.06
Income from investment operations
     Net investment income                             .24              .23
     Net realized and unrealized gain (loss)           .39            (.32)

Total from investment operations                       .63            (.09)
Distributions from
     Net investment income                           (.24)            (.23)
Total increase (decrease) in net asset value           .39            (.32)
Net asset value, ending                              $5.13            $4.74

Total return*                                       13.54%          (2.04%)
Ratios to average net assets:
     Net investment income                           4.86%            4.87%
     Total expenses +                                 .54%               --
     Net expenses                                     .51%             .19%
     Expenses reimbursed                              .38%             .86%
Portfolio turnover                                     11%             65%%
Net assets, ending (in thousands)                   $7,295           $5,866
Number of shares outstanding,
     ending (in thousands)                           1,423            1,239

*        Total return does not reflect deduction of front-end sales charge.
+        Effective December 31, 1995, this ratio reflects total expenses
before reduction for fees paid indirectly; such reductions are included in
the ratio of net expenses. Total expenses are presented net of expense
waivers and reimbursements.

<PAGE>

EXHIBIT A
REDUCED SALES CHARGES

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

Rights of Accumulation can be applied to several accounts
Sales charge breakpoints are automatically calculated for each account based
on the higher of cost or current value of shares previously purchased. This
privilege can be applied to a family group or other qualified group* upon
request. Shares could then be purchased at the reduced sales charge which
applies to the entire group; that is, based on the higher of cost or current
value of shares previously purchased and currently held by all the members
of the group.

     Footnote:
     * A "qualified group" is one which:
     has been in existence for more than six months, and
     has a purpose other than acquiring shares at a discount, and
     satisfies uniform criteria which enable CDI and brokers offering
     shares to realize economies of scale in distributing such shares.

     A qualified group must have more than 10 members, must be available
     to arrange for group meetings between representatives of CDI or
     brokers distributing shares, must agree to include sales and other
     materials related to the Funds in its publications and mailings to
     members at reduced or no cost to CDI or brokers. A pension plan is
     not a qualified group for rights of accumulation.

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

Neither the Funds, nor Calvert Distributors, Inc. ("CDI"), nor any affiliate
thereof will reimburse a plan or participant for any sales charges paid
prior to receipt of such written communication and confirmation by Calvert
Group. Plan administrators should send requests for the waiver of sales
charges based on the above conditions to: Calvert Group Retirement Plans,
4550 Montgomery Avenue, Suite 1000N, Bethesda, Maryland 20814.

<PAGE>

Other Circumstances
There is no sales charge on shares of any Fund of the Calvert Group of Funds
sold to (i) current or retired Directors, Trustees, or Officers of the
Calvert Group of Funds, employees of Calvert Group, Ltd. and its affiliates,
or their family members; (ii) CSIF Advisory Council Members, directors,
officers, and employees of any subadvisor for the Calvert Group of Funds,
employees of broker/dealers distributing the Fund's shares and immediate
family members of the Council, subadvisor, or broker/dealer; (iii) Purchases
made through a Registered Investment Advisor; (iv) Trust departments of
banks or savings institutions for trust clients of such bank or institution,
(v) Purchases through a broker maintaining an omnibus account with the Fund,
provided the purchases are made by (a) investment advisors or financial
planners placing trades for their own accounts (or the accounts of their
clients) and who charge a management, consulting, or other fee for their
services; or (b) clients of such investment advisors or financial planners
who place trades for their own accounts if such accounts are linked to the
master account of such investment advisor or financial planner on the books
and records of the broker or agent; or (c) retirement and deferred
compensation plans and trusts, including, but not limited to, those defined
in section 401(a) or section 403(b) of the I.R.C., and "rabbi trusts."

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

Purchases made at NAV
Except for money market funds, if you make a purchase at NAV, you may
exchange that amount to another Calvert Group Fund at no additional sales
charge.

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

<PAGE>

EXHIBIT B
Service Fees and Arrangements with Dealers

Calvert Distributors, Inc., the Fund's underwriter, pays dealers a
commission, or reallowance (expressed as a percentage of the offering price)
when you purchase shares of non-money market portfolios. CDI also pays
dealers an ongoing service fee while you own shares of a Fund (expressed as
an annual percentage rate of average daily net assets held in Calvert
accounts by that dealer). The table below shows the amount of payment.

                      Maximum Commission/Service Fees

National              2.25%/0.15%
California            2.25%/0.15%
Maryland              2.25%/0.15%
Virginia              2.25%/0.15%

Occasionally, CDI may reallow to dealers the full front-end sales charge.
CDI may also pay additional concessions, including non-cash promotional
incentives, such as merchandise or trips, to brokers employing registered
representatives who have sold or are expected to sell a minimum dollar
amount of shares of the Funds and/or shares of other Funds underwritten by
CDI. CDI may make expense reimbursements for special training of a broker's
registered representatives, advertising or equipment, or to defray the
expenses of sales contests. CAMCO, CDI, or their affiliates may pay certain
broker-dealers and/or other persons, for the sale and distribution of the
securities or for services to the Fund. Payments may include additional
compensation based on assets held through that firm beyond the regularly
scheduled rates, and finder's fees. CDI pays dealers a finder's fee on
shares purchased at NAV in accounts with $1 million or more. The finder's
fee is 1% of the NAV purchase amount on the first $2 million, .80% on $2 to
$3 million, .50% on $3 to $50 million, .25% on $50 to $100 million, and .15%
over $100 million. If a finder's fee is paid, then the service fee begins in
the 13th month after purchase. All payments will be in compliance with the
rules of the National Association of Securities Dealers, Inc.

<PAGE>

To Open an Account:
800-368-2748

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

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

TDD for Hearing-Impaired:
800-541-1524

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

Registered, Certified or
Overnight Mail:
Calvert Group
c/o NFDS
330 West 9th Street
Kansas City, MO 64105

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

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

<PAGE>



Outside Back Cover Page

For investors who want more information about the Funds, the following
documents are available free upon request:

Annual/Semi-Annual Reports: Additional information about each Fund's
investments is available in the Fund's Annual and Semi-Annual reports to
shareholders. In the Fund's annual report, you will find a discussion of the
market conditions and investment strategies that significantly affected the
Fund's performance during its last fiscal year.

Statement of Additional Information (SAI): The SAI for each Fund provides
more detailed information about the Fund and is incorporated into this
prospectus by reference.

You can get free copies of reports and the SAI, request other information
and discuss your questions about the Funds by contacting your broker, or the
Funds at:

Calvert Group
4550 Montgomery Ave, Suite 1000N
Bethesda, Md. 20814

Telephone: 1-800-368-2745

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

You can review the Funds' reports and SAIs at the public Reference Room of
the Securities and Exchange Commission. You can get text-only copies:

For a fee, by writing to or calling the Public Reference Room of the
Commission, Washington, D.C. 20549-6009, Telephone: 1-800-SEC-0330.

Free from the Commission's Internet website at http://www.sec.gov.

Investment Company Act File No.: 811-6525 (Calvert Municipal Fund, Inc.)

<PAGE>

STATEMENT OF ADDITIONAL INFORMATION - April 30, 1999

Calvert Municipal Fund, Inc.
Calvert National Municipal Intermediate Fund
Calvert California Municipal Intermediate Fund
Calvert Maryland Municipal Intermediate Fund
Calvert Virginia Municipal Intermediate Fund

4550 Montgomery Avenue, Bethesda, Maryland 20814

     TABLE OF CONTENTS

     Investment Policies and Risks                           2
     Investment Restrictions                                 7
     Purchases and Redemptions of Shares                     8
     Dividends and Distributions                             9
     Tax Matters                                             9
     Valuation of Shares                                    10
     Calculation of Yield and Total Return                  10
     Advertising                                            12
     Directors and Officers                                 12
     Investment Advisor                                     15
     Administrative Services                                16
     Method of Distribution                                 16
     Transfer and Shareholder Servicing Agent               17
     Independent Accountants and Custodians                 17
     Portfolio Transactions                                 18
     General Information                                    18
     Control Persons and Principal Holders of Securities    19
     Appendix                                               19

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

Shareholder Services
         (800) 368-2745

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

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

         This  Statement  of  Additional  Information  is  not  a  prospectus.
Investors  should read the Statement of Additional  Information in conjunction
with the Prospectus of Calvert  Municipal  Fund (the "Fund"),  dated April 30,
1999, which may be obtained free of charge by writing or calling the Fund.

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

INVESTMENT POLICIES AND RISKS

         Calvert National  Municipal  Intermediate Fund  ("National")  invests
primarily in a nondiversified  portfolio of municipal  obligations,  including
some with  interest  that may be  subject  to  alternative  minimum  tax.  The
average  dollar-weighted  maturity of  investments  is between 3 and 10 years.
Fixed rate  investments  normally  have  remaining  maturities  of 12 years or
less;  variable  rate  investments  may have  longer  maturities.  A  complete
explanation  of  municipal  obligations  and  municipal  bond and note ratings
appears in the Appendix.
         Calvert  California   Municipal   Intermediate  Fund   ("California")
invests  primarily in a  nondiversified  portfolio  of municipal  obligations,
including some with interest that may be subject to  alternative  minimum tax.
Fixed rate  investments  normally  have  remaining  maturities  of 12 years or
less;  variable  rate  investments  may have  longer  maturities.  A  complete
explanation  of  municipal  obligations  and  municipal  bond and note ratings
appears in the Appendix.
         Calvert   Maryland  and   Virginia   Municipal   Intermediate   Funds
("Maryland"   and/or   "Virginia")   invest   primarily  in  a  nondiversified
portfolio of municipal  obligations,  including some with interest that may be
subject  to  alternative  minimum  tax. A complete  explanation  of  municipal
obligations and municipal bond and note ratings appears in the Appendix.
         Under normal market  conditions,  each Fund will attempt to invest at
least 65% of its total assets in municipal  obligations  with interest that is
exempt from federal and, for  California,  Maryland,  and  Virginia,  specific
state  income  tax,  including  those  issued by or on behalf of the state for
which the Fund is named and the state's  political  subdivisions.  California,
Maryland,  and  Virginia  will also  attempt  to invest the  remaining  35% of
total  assets  in  these  obligations,  but may  invest  assets  in  municipal
obligations  of  other  states,  territories  and  possessions  of the  United
States,   the  District  of  Columbia,   and  their  respective   authorities,
agencies,   instrumentalities  and  political   subdivisions.   Dividends  you
receive  from  the  Fund  that  are  derived  from   interest  on   tax-exempt
obligations  of other states will be exempt from federal  income tax, but will
be subject to your  state's  income  taxes.  For  National,  to the extent the
obligations  are  issued by your  state of  residence,  you may also be exempt
from certain state and local income taxes.

Variable Rate Demand Notes
         The  Board  of  Directors  of the Fund has  approved  investments  in
floating  and  variable  rate  demand  notes  upon the  following  conditions:
National,  California,  Maryland,  and  Virginia  ("each  Portfolio"  or  "the
Portfolios")  each have the right of demand,  upon notice not to exceed thirty
days,  against the issuer to receive payment;  the issuer will be able to make
payment  upon  such  demand,  either  from its own  resources  or  through  an
unqualified  commitment from a third party;  and the rate of interest  payable
is calculated  to ensure that the market value of such notes will  approximate
par value on the  adjustment  dates.  The  remaining  maturity  of such demand
notes is deemed the period  remaining  until such time as the Portfolios  have
the  right to  dispose  of the  notes at a price  which  approximates  par and
market  value.  Notes  with  a  right  of  demand  exceeding  seven  days  are
considered illiquid and are subject to purchase restrictions.

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

Temporary Investments
         Short-term money market type investments  consist of:  obligations of
the U.S.  Government,  its agencies  and  instrumentalities;  certificates  of
deposit  of banks  with  assets of one  billion  dollars  or more;  commercial
paper or other corporate notes of  investment-grade  quality;  and any of such
items subject to short-term repurchase agreements.

When-Issued Purchases
         New issues of  municipal  obligations  are  offered on a  when-issued
basis;  that is,  delivery and payment for the securities  normally take place
15 to 45 days after the date of the  transaction.  The payment  obligation and
the yield that will be received on the  securities  are each fixed at the time
the  buyer  enters  into  the  commitment.   The  Portfolios  will  only  make
commitments  to  purchase  these  securities  with the  intention  of actually
acquiring  them, but may sell these  securities  before the settlement date if
it is deemed advisable as a matter of investment strategy.
         Securities  purchased on a when-issued  basis and the securities held
in a  Portfolio  are  subject  to  changes  in  market  value  based  upon the
public's  perception of the  creditworthiness of the issuer and changes in the
level of interest  rates  (which  will  generally  result in both  changing in
value in the same way,  i.e.,  both  experiencing  appreciation  when interest
rates decline and  depreciation  when interest rates rise).  Therefore,  if in
order to achieve higher interest  income,  a Portfolio  remains  substantially
fully  invested  at the  same  time  that  it has  purchased  securities  on a
when-issued basis,  there will be a greater  possibility that the market value
of the Portfolio's assets may vary.
         When the time comes to pay for  when-issued  securities,  a Portfolio
will meet its  obligations  from then available cash flow,  sale of securities
or,  although  it  would  not  normally  expect  to do so,  from  sale  of the
when-issued  securities  themselves  (which may have a market value greater or
less than the  Portfolio's  payment  obligation).  Sale of  securities to meet
such  obligations  carries with it a greater  potential for the realization of
capital  losses and capital  gains which are not exempt  from  federal  income
tax.  When-issued  securities  do not earn income until they have in fact been
issued.
         When a Portfolio purchases a when-issued  security,  it will maintain
an amount of cash, cash equivalents  (for example,  commercial paper and daily
tender adjustable  notes) or short-term  high-grade fixed income securities in
a segregated  account with the Portfolio's  custodian.  The segregated account
equals the market  value of the  when-issued  purchase,  thereby  ensuring the
transaction is unleveraged.

Derivatives
         The  Portfolios  can use various  techniques  to increase or decrease
exposure to changing  security  prices,  interest rates, or other factors that
affect security values.  These techniques may involve derivative  transactions
such as buying  and  selling  options  and  futures  contracts  and  leveraged
notes, entering into swap agreements,  and purchasing indexed securities.  The
Portfolios can use these  practices  either as  substitution  or as protection
against  an  adverse  move in the  Portfolios  to adjust  the risk and  return
characteristics  of the  Portfolios.  If the Advisor judges market  conditions
incorrectly  or  employs  a  strategy  that  does not  correlate  well  with a
Portfolio's  investments,  or if the  counterparty to the transaction does not
perform  as  promised,   these  techniques  could  result  in  a  loss.  These
techniques  may  increase  the  volatility  of a  Portfolio  and may involve a
small  investment  of cash  relative  to the  magnitude  of the risk  assumed.
Derivatives are often illiquid.

Transactions in Futures Contracts
         Each  Portfolio  may  engage  in the  purchase  and  sale of  futures
contracts on an index of municipal bonds or on U.S.  Treasury  securities,  or
options on such  futures  contracts,  for  hedging and  substitution  purposes
only.  Each  Portfolio may sell such futures  contracts in  anticipation  of a
decline in the cost of municipal  bonds it holds or may purchase  such futures
contracts in  anticipation  of an increase in the value of municipal bonds the
Portfolio  intends to acquire.  Each  Portfolio also is authorized to purchase
and  sell  other  financial  futures  contracts  which in the  opinion  of the
Investment  Advisor  provide  an  appropriate  hedge  for  some  or all of its
securities.
         Because of low  initial  margin  deposits  made upon the opening of a
futures position,  futures  transactions  involve substantial  leverage.  As a
result,  relatively  small movements in the price of the futures  contract can
result in  substantial  unrealized  gains or losses.  Because  each  Portfolio
will engage in the  purchase and sale of financial  futures  contracts  solely
for  hedging  and  substitution  purposes,  however,  any losses  incurred  in
connection  therewith  should,  if the  strategy is  successful,  be offset in
whole or in part by increases in the value of  securities  held by a Portfolio
or decreases in the price of securities a Portfolio intends to acquire.
         Municipal  bond index  futures  contracts  commenced  trading in June
1985,  and it is possible that trading in such futures  contracts will be less
liquid  than  that  in  other  futures  contracts.   The  trading  of  futures
contracts  and options  thereon is subject to certain  market  risks,  such as
trading halts,  suspensions,  exchange or clearing house  equipment  failures,
government  intervention  or other  disruptions  of normal  trading  activity,
which could at times make it difficult  or  impossible  to liquidate  existing
positions.
         The  liquidity  of a  secondary  market in futures  contracts  may be
further  adversely  affected by "daily price fluctuation  limits"  established
by contract  markets,  which limit the amount of fluctuation in the price of a
futures  contract or option  thereon  during a single  trading  day.  Once the
daily limit has been  reached in the  contract,  no trades may be entered into
at a  price  beyond  the  limit,  thus  preventing  the  liquidation  of  open
positions.  Prices  of  existing  contracts  have in the past  moved the daily
limit on a number of  consecutive  trading  days.  Each  Portfolio  will enter
into a futures  position only if, in the judgment of the  Investment  Advisor,
there  appears to be an  actively  traded  secondary  market for such  futures
contracts.
         The successful use of transactions  in futures  contracts and options
thereon  depends  on  the  ability  of the  Investment  Advisor  to  correctly
forecast the  direction  and extent of price  movements of these  instruments,
as well as price movements of the securities  held by each Portfolio  within a
given time frame.  To the extent these prices  remain stable during the period
in which a futures or option  contract  is held by a  Portfolio,  or move in a
direction  opposite to that  anticipated,  a  Portfolio  may realize a loss on
the  hedging  transaction  which  is  not  fully  or  partially  offset  by an
increase in the value of its  securities.  As a result,  a  Portfolio's  total
return for such  period may be less than if it had not  engaged in the hedging
transaction.

Description of Financial Futures Contracts
         Futures  Contracts.  A futures  contract  obligates  the  seller of a
contract to deliver and the  purchaser  of a contract to take  delivery of the
type  of  financial  instrument  called  for  in  the  contract  or,  in  some
instances,  to  make a cash  settlement,  at a  specified  future  time  for a
specified  price.  Although the terms of a contract  call for actual  delivery
or  acceptance  of  securities,  or for a cash  settlement,  in most cases the
contracts  are closed out before the  delivery  date  without the  delivery or
acceptance  taking  place.  Each  Portfolio  intends to close out any  futures
contracts prior to the delivery date of such contracts.
         Each  Portfolio  may sell  futures  contracts  in  anticipation  of a
decline  in  the  value  of its  investments  in  municipal  bonds.  The  loss
associated  with any such decline could be reduced without  employing  futures
as a  hedge  by  selling  long-term  securities  and  either  reinvesting  the
proceeds in securities  with shorter  maturities or by holding assets in cash.
This strategy,  however,  entails  increased  transaction costs in the form of
brokerage  commissions  and dealer  spreads  and will  typically  reduce  each
Portfolio's average yields as a result of the shortening of maturities.
         The  purchase  or  sale  of  a  futures  contract  differs  from  the
purchase  or  sale of a  security,  in that no  price  or  premium  is paid or
received.  Instead,  an  amount  of  cash  or  securities  acceptable  to each
Portfolio's  futures  commission  merchant and the relevant  contract  market,
which varies but is generally  about 5% or less of the contract  amount,  must
be deposited  with the broker.  This amount is known as "initial  margin," and
represents  a "good  faith"  deposit  assuring  the  performance  of both  the
purchaser  and the seller  under the futures  contract.  Subsequent  payments,
known as  "variation  margin," are required to be made on a daily basis as the
price of the futures contract  fluctuates,  making the long or short positions
in the futures  contract  more or less  valuable,  a process known as "marking
to the market."  Prior to the  settlement  date of the futures  contract,  the
position may be closed out by taking an opposite  position  which will operate
to terminate the position in the futures  contract.  A final  determination of
variation  margin is then made,  additional  cash is required to be paid to or
released  by the  broker,  and  the  purchaser  realizes  a loss or  gain.  In
addition,   a  commission  is  paid  on  each  completed   purchase  and  sale
transaction.
         The sale of  financial  futures  contracts  provides  an  alternative
means  of  hedging  a  Portfolio   against   declines  in  the  value  of  its
investments  in  municipal  bonds.  As such  values  decline,  the  value of a
Portfolio's  position in the futures  contracts  will tend to  increase,  thus
offsetting  all or a portion of the  depreciation  in the market  value of the
Portfolio's  fixed  income  investments  which  are  being  hedged.   While  a
Portfolio  will incur  commission  expenses  in  establishing  and closing out
futures  positions,  commissions on futures  transactions may be significantly
lower  than  transaction  costs  incurred  in the  purchase  and sale of fixed
income  securities.  In  addition,  the ability of a Portfolio to trade in the
standardized  contracts  available  in the  futures  market  may  offer a more
effective  hedging  strategy than a program to reduce the average  maturing of
portfolio  securities,  due to the  unique and  varied  credit  and  technical
characteristics   of  the  municipal   debt   instruments   available  to  the
Portfolio.  Employing  futures as a hedge may also  permit each  Portfolio  to
assume a  hedging  posture  without  reducing  the  yield on its  investments,
beyond any amounts required to engage in futures trading.
         Each  Portfolio  may  engage  in the  purchase  and  sale of  futures
contracts on an index of municipal  securities.  These instruments provide for
the  purchase or sale of a  hypothetical  portfolio  of  municipal  bonds at a
fixed price in a stated delivery month.  Unlike most other futures  contracts,
however,  a municipal  bond index  futures  contract  does not require  actual
delivery  of  securities  but  results  in a cash  settlement  based  upon the
difference  in value of the index  between the time the  contract  was entered
into and the time it is liquidated.
         The municipal bond index  underlying the futures  contracts traded by
each Portfolio is The Bond Buyer  Municipal Bond Index,  developed by The Bond
Buyer and the Chicago  Board of Trade  ("CBT"),  the contract  market on which
the  futures  contracts  are traded.  As  currently  structured,  the index is
comprised of 40  tax-exempt  intermediate-term  municipal  revenue and general
obligation  bonds.  Each bond included in the index must be rated either A- or
higher by  Standard & Poor's or A or higher by Moody's  Investors  Service and
must have a remaining  maturity of 19 years or more.  Twice a month new issues
satisfying the eligibility  requirements  are added to, and an equal number of
old  issues  will be  deleted  from,  the  index.  The  value of the  index is
computed  daily  according  to a formula  based upon the price of each bond in
the index, as evaluated by four dealer-to-dealers brokers.
         Each  Portfolio may also purchase and sell futures  contracts on U.S.
Treasury   bills,   notes  and  bonds  for  the  same  types  of  hedging  and
substitution  purposes.  Such  futures  contracts  provide for delivery of the
underlying  security at a specified  future  time for a fixed  price,  and the
value of the futures contract  therefore  generally  fluctuates with movements
in interest rates.
         The  municipal  bond index  futures  contract,  futures  contracts on
U.S.  Treasury  securities and options on such futures contracts are traded on
the CBT, which,  like other contract  markets,  assures the performance of the
parties to each futures contract through a clearing  corporation,  a nonprofit
organization  managed by the exchange  membership,  which is also  responsible
for handling daily accounting of deposits or withdrawals of margin.
         Each  Portfolio may also purchase  financial  futures  contracts when
not fully invested in municipal  bonds,  in anticipation of an increase in the
cost of securities a Portfolio  intends to purchase.  As such  securities  are
purchased,  an equivalent  amount of futures  contracts will be closed out. In
a  substantial  majority  of these  transactions,  a Portfolio  will  purchase
municipal  bonds upon  termination of the futures  contracts.  Due to changing
market  conditions and interest rate forecasts,  however,  a futures  position
may  be   terminated   without  a   corresponding   purchase  of   securities.
Nevertheless,  all  purchases  of futures  contracts  by a  Portfolio  will be
subject to certain restrictions, described below.
         Options  on  Futures  Contracts.  An  option  on a  futures  contract
provides the purchaser with the right,  but not the obligation,  to enter into
a long position in the  underlying  futures  contract  (that is,  purchase the
futures  contract),  in the case of a "call" option, or a short position (sell
the futures  contract),  in the case of a "put"  option,  for a fixed price up
to a stated  expiration  date.  The option is purchased  for a  non-refundable
fee,  known as the  "premium."  Upon  exercise  of the  option,  the  contract
market  clearing  house assigns each party to the option an opposite  position
in the underlying futures contract. In the event of exercise,  therefore,  the
parties  are subject to all of the risks of futures  trading,  such as payment
of initial and  variation  margin.  In addition,  the seller,  or "writer," of
the option is subject to margin  requirements on the option position.  Options
on  futures  contracts  are  traded  on  the  same  contract  markets  as  the
underlying futures contracts.
         Each  Portfolio  may purchase  options on futures  contracts  for the
same types of purposes  described above in connection with futures  contracts.
For example,  in order to protect against an anticipated  decline in the value
of  securities  it holds,  a Portfolio  could  purchase put options on futures
contracts,  instead of selling the underlying futures  contracts.  Conversely,
in order to protect  against the adverse  effects of anticipated  increases in
the costs of  securities  to be  acquired,  a Portfolio  could  purchase  call
options on futures  contracts,  instead of purchasing the  underlying  futures
contracts.  Each Portfolio  generally  will sell options on futures  contracts
only to close out an existing position.
         Each Portfolio will not engage in  transactions  in such  instruments
unless and until the  Investment  Advisor  determines  that market  conditions
and the  circumstances  of the Portfolio  warrant such trading.  To the extent
that a Portfolio  engages in the  purchase  and sale of futures  contracts  or
options  thereon,  it will do so only at a level  which is  reflective  of the
Investment  Advisor's view of the Portfolio's  hedging needs, the liquidity of
the market for  futures  contracts  and the  anticipated  correlation  between
movements  in the value of the  futures  or option  contract  and the value of
securities held by the Portfolio.
         Restrictions  on the Use of Futures  Contracts and Options on Futures
Contracts.  Under  regulations  of the Commodity  Futures  Trading  Commission
("CFTC"),  the futures trading activities  described herein will not result in
a  Portfolio  being  deemed to be a  "commodity  pool," as defined  under such
regulations,  provided that certain  trading  restrictions  are adhered to. In
particular,  CFTC  regulations  require that all futures and option  positions
entered  into by a  Portfolio  qualify  as bona fide  hedge  transactions,  as
defined under CFTC  regulations,  or, in the case of long positions,  that the
value of such  positions not exceed an amount of segregated  funds  determined
by  reference  to  certain  cash  and  securities  positions  maintained  by a
Portfolio and accrued profits on such positions.  In addition,  as a matter of
operating  policy,  a Portfolio may not purchase or sell a futures contract or
an  option  thereon  if,  immediately  thereafter,  the sum of the  amount  of
initial margin  deposits on the  Portfolio's  existing  futures  positions and
premiums on such  options  would exceed 5% of its total  assets,  based on net
premium payments.
         When a Portfolio  purchases a futures  contract,  it will maintain an
amount of cash,  cash  equivalents  (for example,  commercial  paper and daily
tender adjustable  notes) or short-term  high-grade fixed income securities in
a segregated  account with the  Portfolio's  custodian,  so that the amount so
segregated  plus the  amount  of  initial  and  variation  margin  held in the
account  of its  broker  equals  the  market  value of the  futures  contract,
thereby ensuring that the use of such futures is unleveraged.
         Risk Factors in  Transactions  in Futures  Contracts.  The particular
municipal  bonds  comprising  the index  underlying  the municipal  bond index
futures  contract may vary from the bonds held by the Portfolio.  In addition,
the securities  underlying futures contracts on U.S. Treasury  securities will
not be the  same as  securities  held by the  Portfolios.  As a  result,  each
Portfolio's  ability  effectively  to hedge all or a  portion  of the value of
its municipal  bonds through the use of futures  contracts will depend in part
on the degree to which price  movements in the index  underlying the municipal
bond  index  futures  contract,  or the U.S.  Treasury  securities  underlying
other  futures  contracts  trade,   correlate  with  price  movements  of  the
municipal bonds held by the Portfolio.
         For example,  where prices of  securities  in a Portfolio do not move
in the same  direction  or to the same extent as the values of the  securities
or  index  underlying  a  futures  contract,   the  trading  of  such  futures
contracts  may not  effectively  hedge  the  Portfolio's  investments  and may
result in trading  losses.  The  correlation may be affected by disparities in
the  average  maturity,   ratings,   geographical  mix  or  structure  of  the
Portfolio's  investments  as  compared  to those  comprising  the  index,  and
general economic or political factors.  In addition,  the correlation  between
movements  in the value of the index  underlying  a  futures  contract  may be
subject to change over time,  as  additions  to and  deletions  from the index
alter  its  structure.  In the  case of  futures  contracts  on U.S.  Treasury
securities  and  options  thereon,   the  anticipated   correlation  of  price
movements  between  the U.S.  Treasury  securities  underlying  the futures or
options  and   municipal   bonds  may  be  adversely   affected  by  economic,
political,  legislative or other  developments that have a disparate impact on
the respective  markets for such securities.  In the event that the Investment
Advisor  determines to enter into  transactions in financial futures contracts
other  than the  municipal  bond  index  futures  contract  or futures on U.S.
Treasury  securities,  the risk of imperfect  correlation between movements in
the prices of such futures  contracts  and the prices of municipal  bonds held
by a Portfolio may be greater.
         The trading of futures  contracts  on an index also  entails the risk
of  imperfect  correlation  between  movements  in the  price  of the  futures
contract  and the  value  of the  underlying  index.  The  anticipated  spread
between the prices may be distorted  due to  differences  in the nature of the
markets,  such as margin  requirements,  liquidity  and the  participation  of
speculators  in the  futures  markets.  The  risk  of  imperfect  correlation,
however,  generally  diminishes as the delivery month specified in the futures
contract approaches.
         Prior to exercise or expiration,  a position in futures  contracts or
options  thereon may be terminated  only by entering  into a closing  purchase
or  sale  transaction.  This  requires  a  secondary  market  on the  relevant
contract  market.  Each Portfolio will enter into a futures or option position
only if there  appears  to be a liquid  secondary  market  therefor,  although
there can be no assurance that such a liquid  secondary  market will exist for
any  particular  contract at any specific  time.  Thus, it may not be possible
to  close  out  a  position   once  it  has  been   established.   Under  such
circumstances,  a Portfolio  could be required to make  continuing  daily cash
payments  of  variation  margin in the event of adverse  price  movements.  In
such situation,  if a Portfolio has  insufficient  cash, it may be required to
sell portfolio  securities to meet daily  variation  margin  requirements at a
time when it may be  disadvantageous  to do so. In addition,  a Portfolio  may
be required to perform  under the terms of the futures or option  contracts it
holds.  The  inability  to close out futures or options  positions  also could
have an  adverse  impact on a  Portfolio's  ability  effectively  to hedge its
portfolio.
         When a  Portfolio  purchases  an option on a  futures  contract,  its
risk is  limited  to the  amount  of the  premium,  plus  related  transaction
costs,  although  this entire  amount may be lost.  In  addition,  in order to
profit from the purchase of an option on a futures  contract,  a Portfolio may
be  required to  exercise  the option and  liquidate  the  underlying  futures
contract,  subject  to the  availability  of a liquid  secondary  market.  The
trading of options on futures  contracts  also  entails the risk that  changes
in the value of the underlying  futures  contract will not be fully  reflected
in the  value  of the  option,  although  the  risk of  imperfect  correlation
generally  tends to diminish as the maturity  date of the futures  contract or
expiration date of the option approaches.
         "Trading  Limits"  or  "Position  Limits"  may also be imposed on the
maximum  number of  contracts  which any  person may hold at a given  time.  A
contract  market  may  order  the  liquidation  of  positions  found  to be in
violation of these limits and it may impose other  sanctions or  restrictions.
The  Investment  Advisor does not believe  that  trading  limits will have any
adverse impact on the strategies for hedging a Portfolio's investments.
         Further,  the trading of futures  contracts is subject to the risk of
the insolvency of a brokerage firm or clearing  corporation,  which could make
it  difficult or  impossible  to  liquidate  existing  positions or to recover
excess variation margin payments.
         In  addition  to the  risks of  imperfect  correlation  and lack of a
liquid  secondary  market  for  such  instruments,   transactions  in  futures
contracts   involve  risks  related  to  leveraging   and  the  potential  for
incorrect  forecasts of the direction  and extent of interest  rate  movements
within a given time frame.

Credit Quality
         As an operating  policy,  each Portfolio may not invest more than 35%
of its net assets in non-investment grade municipal  obligations.  As has been
the industry  practice,  this  determination  of credit quality is made at the
time a Portfolio  acquires  the  obligation.  However,  because it is possible
that subsequent  downgrades  could occur, if an obligation held by a Portfolio
is later  downgraded,  the Advisor,  under the supervision of the Fund's Board
of  Directors,  will  consider  whether  it is in  the  best  interest  of the
shareholders  to hold or to  dispose  of the  obligation.  Among the  criteria
that may be considered by the Advisor and the Board are the  probability  that
the  obligations  will  be  able  to make  scheduled  interest  and  principal
payments  in  the  future,   the  extent  to  which  any  devaluation  of  the
obligation has already been  reflected in the Portfolio' net asset value,  and
the  total   percentage,   if  any,  of  obligations   currently  rated  below
investment-grade held by a Portfolio.
         Noninvestment-grade  securities  ("junk bonds") have moderate to poor
protection   of  principal  and  interest   payments  and  are   predominately
speculative.  They involve  greater  risk of default or price  declines due to
changes  in  the  issuer's   creditworthiness   than   investment-grade   debt
securities.  Because the market for lower-rated  securities may be thinner and
less  active  than for  higher-rated  securities,  there may be  market  price
volatility for these  securities  and limited  liquidity in the resale market.
Market prices for these  securities  may decline  significantly  in periods of
general economic difficulty or rising interest rates.

INVESTMENT RESTRICTIONS

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

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

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

         (1)   Each Portfolio may not purchase common stocks,
              preferred stocks, warrants, or other equity securities.
         (2)   Each Portfolio does not intend to make any purchases
              of securities if borrowing exceeds 5% of a portfolio's
              total assets.
         (3)   Each  Portfolio may not purchase  illiquid  securities
              if more  than 15% of the value of net  assets  would be
              invested in such securities;
         (4)   Each   Portfolio  may  not  sell   securities   short,
              purchase  securities  on margin,  or write put and call
              options,   except  to  the   extent   permitted   under
              "Transactions  in Futures  Contracts"  or  elsewhere in
              the  Prospectus  or SAI.  The  Portfolios  reserve  the
              right to purchase securities with puts attached.
         (5)   Each  Portfolio  may not  purchase  or sell a  futures
              contract   or  an   option   thereon   if   immediately
              thereafter,  the sum of the  amount of  initial  margin
              deposits on futures and premiums on such options  would
              exceed 5% of the  Portfolio's  total  assets,  based on
              net premium payments.
         (6)   National and California each may not invest in puts
              or calls on a security, including straddles, spreads,
              or any combination, if the value of that option
              premium, when aggregated with the premiums on all
              other options on securities held by the Portfolio,
              exceeds 5% of the Portfolio's total assets.

PURCHASES AND REDEMPTIONS OF SHARES

         Share  certificates  will be  issued at no  charge  if  requested  in
writing  by the  investor.  No  certificates  will be  issued  for  fractional
shares (see Prospectus, "How to Sell Your Shares").
         To change redemption  instructions  already given,  shareholders must
send a written  notice to Calvert Group,  c/o NFDS,  330 W. 9th,  Kansas City,
MO 64105,  with a voided copy of a check for the bank wiring  instructions  to
be added.  If a voided check does not accompany the request,  then the request
must  be  signature   guaranteed  by  a  commercial  bank,  savings  and  loan
association,  trust company,  member firm of any national securities exchange,
or  certain  credit  unions.   Further  documentation  may  be  required  from
corporations, fiduciaries, and institutional investors.
         The  right of  redemption  may be  suspended  or the date of  payment
postponed  for any period  during which the New York Stock  Exchange is closed
(other than customary weekend and holiday  closings),  when trading on the New
York Stock Exchange is restricted,  or an emergency  exists,  as determined by
the  SEC,  or if  the  Commission  has  ordered  such  a  suspension  for  the
protection of shareholders.  Redemption  proceeds are normally mailed or wired
the next  business day after a proper  redemption  request has been  received,
unless redemptions have been suspended or postponed as described above.
         Certain  shares may be subject to a contingent  deferred sales charge
which  is  subtracted   from  the   redemption   proceeds   (see   Prospectus,
"Calculation  of  Contingent  Deferred  Sales  Charges  and  Waiver  of  Sales
Charges").
         Redemption  proceeds  are  normally  paid  in  cash.  However,   each
Portfolio  has the  right to  redeem  shares  in  assets  other  than cash for
redemption  amounts  exceeding,  in any 90-day  period,  $250,000 or 1% of the
net asset value of a Portfolio, whichever is less.

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

DIVIDENDS AND DISTRIBUTIONS

         Each  Portfolio  declares  and  pays  monthly  dividends  of its  net
income  to  shareholders  of  record  as of the  close  of  business  on  each
designated  monthly  record  date.  Net  investment  income  consists  of  the
interest income earned on investments  (adjusted for  amortization of original
issue  discounts or premiums or market  premiums),  less  estimated  expenses.
Capital   gains,   if  any,  are  normally  paid  once  a  year  and  will  be
automatically  reinvested at net asset value in additional  shares.  Dividends
and any  distributions  are  automatically  reinvested in additional shares of
the Fund,  unless you elect to have the  dividends of $10 or more paid in cash
(by check or by Calvert Money  Controller).  You may also request to have your
dividends  and  distributions  from the  Portfolio  invested  in shares of any
other Calvert Group Fund, at no additional charge.

                                 TAX MATTERS

         Each   Portfolio   intends  to  continue  to  qualify  as   regulated
investment  companies under  Subchapter M of the Internal Revenue Code. If for
any  reason  a  Portfolio  should  fail to  qualify,  it  would  be taxed as a
corporation  at the Portfolio  level,  rather than passing  through its income
and gains to shareholders.
         Each  Portfolio's  dividends  of  net  investment  income  constitute
exempt-interest  dividends on which  shareholders are not generally subject to
federal  income  tax;  however  under  the  Act,  dividends   attributable  to
interest  on  certain  private  activity  bonds  must be  included  in federal
alternative  minimum  taxable income for the purpose of determining  liability
(if any) for  individuals and for  corporations.  Each  Portfolio's  dividends
derived from taxable  interest and  distributions  of net  short-term  capital
gains,  whether taken in cash or reinvested in additional  shares, are taxable
to  shareholders  as  ordinary  income and do not  qualify  for the  dividends
received  deduction  for  corporations.  If you held  shares for six months or
less,  losses must be offset by the amount of  exempt-interest  dividends  you
received,  and, to the extent of capital gain distributions you received,  the
loss  amount not offset  (disallowed)  must be  treated as  long-term  capital
loss.
         A  shareholder  may also be subject to some state and local  taxes on
dividends  and  distributions.  Each  Portfolio  will notify its  shareholders
annually  about the tax status of  dividends  and  distributions  paid and the
amount of dividends withheld, if any, during the previous year.
         The  Code  provides  that  interest  on   indebtedness   incurred  or
continued  in order to  purchase  or carry  shares of a  regulated  investment
company which  distributes  exempt-interest  dividends  during the year is not
deductible.  Furthermore,  entities or persons who are "substantial users" (or
persons  related to  "substantial  users") of  facilities  financed by private
activity bonds should consult their tax advisors before  purchasing  shares of
a  Portfolio.   "Substantial   user"  is  generally  defined  as  including  a
"nonexempt  person"  who  regularly  uses in  trade  or  business  a part of a
facility financed from the proceeds of private activity bonds.
         Each  Portfolio  may be  required to  withhold  31% of any  long-term
capital gain  dividends  and 31% of each  redemption  transaction  if: (a) the
shareholder's social security number or other taxpayer  identification  number
("TIN") is not provided or an  obviously  incorrect  TIN is provided;  (b) the
shareholder  does  not  certify  under  penalties  of  perjury  that  the  TIN
provided  is the  shareholder's  correct TIN and that the  shareholder  is not
subject  to  backup  withholding  under  section  3406(a)(1)(C)  of  the  Code
because of  underreporting  (however,  failure to provide  certification as to
the  application  of  section   3406(a)(1)(C)   will  result  only  in  backup
withholding  on  capital  gain  dividends,  not  on  redemptions);  or  (c)  a
Portfolio  is notified by the Internal  Revenue  Service that the TIN provided
by the  shareholder  is  incorrect  or that there has been  underreporting  of
interest or dividends by the shareholder.  Affected  shareholders will receive
statements at least annually specifying the amount withheld.
         In  addition,  each  Portfolio  is required to report to the Internal
Revenue  Service  the  following   information   with  respect  to  redemption
transactions:   (a)  the  shareholder's  name,  address,  account  number  and
taxpayer   identification   number;   (b)  the  total   dollar  value  of  the
redemptions; and (c) the identifying CUSIP number.
         Certain   shareholders   are,   however,   exempt   from  the  backup
withholding and broker reporting  requirements.  Exempt shareholders  include:
corporations;  financial institutions;  tax-exempt  organizations;  individual
retirement  plans;  the  U.S.,  a State,  the  District  of  Columbia,  a U.S.
possession,  a  foreign  government,  an  international  organization,  or any
political  subdivision,  agency, or  instrumentality  of any of the foregoing;
U.S.  registered  commodities or securities  dealers;  real estate  investment
trusts;  registered  investment  companies;  bank common trust funds;  certain
charitable  trusts;  and foreign  central banks of issue.  Nonresident  aliens
also are generally not subject to either  requirement  but, along with certain
foreign  partnerships  and  foreign  corporations,  may  instead be subject to
withholding under section 1441 of the Code.  Shareholders  claiming  exemption
from  backup  withholding  and  broker  reporting  should  call or  write  for
further information.

VALUATION OF SHARES

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

Net Asset Value and Offering Price Per Share
         National
         Net asset value per share
         ($71,064,503/6,570,474 shares)                          $10.82
         Maximum sales charge
         (2.75% of offering price)                                 0.30
         Offering price per share                                $11.12

         California
         Net asset value per share
         ($36,963,400/3,442,156 shares)                          $10.74
         Maximum sales charge
         (2.75% of offering price)                                 0.30
         Offering price per share                                $11.04

         Maryland
         Net asset value per share
         ($12,164,979/2,335,912 shares)                           $5.21
         Maximum sales charge
         (2.75% of offering price)                                 0.14
         Offering price per share                                 $5.35

         Virginia
         Net asset value per share
         ($14,438,800/2,747,881 shares)                           $5.25
         Maximum sales charge
         (2.75% of offering price)                                 0.14
         Offering price per share                                 $5.39

CALCULATION OF YIELD AND TOTAL RETURN

         Each  Portfolio  may advertise  its "total  return."  Total return is
historical  in nature and is not  intended  to  indicate  future  performance.
Total  return will be quoted for the most recent  one-year  period,  five-year
period,  and period  from  inception  of the  Portfolio's  offering of shares.
Return  quotations  for  periods in excess of one year  represent  the average
annual  total  return for the period  included  in the  particular  quotation.
Total return is a  computation  of the  Portfolio's  dividend  yield,  plus or
minus realized or unrealized capital  appreciation or depreciation,  less fees
and  expenses.   Total  return   quotations   reflect  the  deduction  of  the
Portfolio's  maximum  sales  charge  ("return  with  maximum  load"),   except
quotations  of "return  without  maximum  load"  which do not deduct the sales
charge.  Note:  "Total Return" as quoted in the Financial  Highlights  section
of the  Prospectus  and  Annual  Report  to  Shareholders,  however,  per  SEC
instructions,   does  not  reflect   deduction  of  the  sales   charge,   and
corresponds  to "return  without  maximum load" as referred to herein.  Return
without  maximum  load  should  be  considered  only  by  investors,  such  as
participants  in certain  pension  plans,  to whom the sales  charge  does not
apply, or for purposes of comparison  only with comparable  figures which also
do not  reflect  sales  charges,  such as  Lipper  averages.  Total  return is
computed according to the following formula:

                               P(1 + T)n = ERV

where P = a  hypothetical  initial  payment of $1,000;  T = total return;  n =
number of  years;  and ERV = the  ending  redeemable  value of a  hypothetical
$1,000  payment  made at the  beginning  of the 1, 5 or 10 year periods at the
end of such  periods (or portions  thereof,  if  applicable).  Returns for the
periods from inception through December 31, 1998 are as follows:

                           National                  National
                           With                      Without
                           Max. Load                 Max. Load

One Year                   2.52%                     5.46%
Five Year                  5.10%                     5.68%
From Inception             5.80%                     6.27%
(9/30/92)

                           California                California
                           With                      Without
                           Max. Load                 Max. Load

One Year                   2.61%                     5.51%
Five Year                  4.34%                     4.93%
From Inception             5.45%                     5.89%
(5/29/92)

                           Maryland                  Maryland
                           With                      Without
                           Max. Load                 Max. Load

One Year                   1.94%                     4.88%
Five Year                  4.65%                     5.23%
From Inception             4.79%                     5.34%
(9/30/93)

                           Virginia                  Virginia
                           With                      Without
                           Max. Load                 Max. Load

One Year                   1.94%                     4.88%
Five Year                  4.65%                     5.22%
From Inception             4.84%                     5.39%
(9/30/93)

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

Yield = 2[(a-b/cd)+1)6 - 1]

where a =  dividends  and  interest  earned  during the  period;  b = expenses
accrued for the period (net of  reimbursement);  c = the average  daily number
of shares  outstanding  during  the  period  that  were  entitled  to  receive
dividends;  and d = the  maximum  offering  price per share on the last day of
the period.
         The  taxable  equivalent  yield  is the  yield an  investor  would be
required to obtain from  taxable  investments  to equal a  Portfolio's  yield,
all or a  portion  of which may be  exempt  from  federal  income  taxes.  The
taxable  equivalent  yield is  computed  by taking  the  portion  of the yield
exempt  from  federal  income  taxes and  multiplying  the  exempt  yield by a
factor  based on a stated  income tax rate,  then  adding  the  portion of the
yield that is not exempt from federal  income taxes.  The factor which is used
to calculate the tax  equivalent  yield is the  reciprocal  of the  difference
between 1 and the  applicable  income  tax rate,  which  will be stated in the
advertisement.
         For the  thirty-day  period ended  December  31, 1998,  the yield and
federal tax equivalent yields were as follows:

              December 31,       36% federal         39.6% federal
              1998               tax equivalent      tax equivalent
              yield              yield               yield

National      3.67%              5.73%               6.08%
California    3.56%              5.56%               5.89%
Virginia      3.39%              5.30%               5.61%
Maryland      3.46%              5.41%               5.73%

ADVERTISING

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

DIRECTORS AND OFFICERS

         Each Portfolio's Board of Trustees/Directors supervises the
Portfolio's activities and reviews its contracts with companies that provide
it with services.
         RICHARD L.  BAIRD,  JR.,  Trustee/Director.  Mr.  Baird is  Executive
Vice   President  for  the  Family  Health   Council,   Inc.  in   Pittsburgh,
Pennsylvania,   a  non-profit   corporation  which  provides  family  planning
services,   nutrition,   maternal/child   health  care,   and  various  health
screening   services.   Mr.  Baird  is  a  trustee/director  of  each  of  the
investment  companies  in the  Calvert  Group of  Funds,  except  for  Calvert
Variable Series,  Inc.,  Calvert New World Fund, Inc. and Calvert World Values
Fund,  Inc.  DOB:   05/09/48.   Address:   211  Overlook  Drive,   Pittsburgh,
Pennsylvania 15216.
         FRANK H. BLATZ, JR., Esq.,  Trustee/Director.  Mr. Blatz is a partner
in the law firm of Snevily,  Ely,  Williams & Blatz. He was formerly a partner
with Abrams,  Blatz,  Gran,  Hendricks & Reina,  P.A. He is also a director of
Calvert Variable Series, Inc. DOB: 10/29/35.  Address:  308 East Broad Street,
Westfield, New Jersey 07091.
         FREDERICK T. BORTS, M.D., Trustee/Director. Dr. Borts is a
radiologist with Kaiser Permanente. Prior to that, he was a radiologist at
Bethlehem Medical Imaging in Allentown, Pennsylvania. DOB: 07/23/49.
Address: 16 Iliahi Street, Honolulu, Hawaii, 96817.
         CHARLES E.  DIEHL,  Trustee/Director.  Mr.  Diehl is a  self-employed
consultant  and is  Vice  President  and  Treasurer  Emeritus  of  the  George
Washington University.  He has retired from University Support Services,  Inc.
of  Herndon,  Virginia.  Formerly,  he was a Director  of Acacia  Mutual  Life
Insurance   Company,   and  is  currently  a  Director  of  Servus   Financial
Corporation.   DOB:  10/13/22.  Address:  1658  Quail  Hollow  Court,  McLean,
Virginia 22101.
         DOUGLAS E. FELDMAN, M.D.,  Trustee/Director.  Dr. Feldman is managing
partner of Feldman Otolaryngology,  Head and Neck Surgery in Washington,  D.C.
A  graduate  of  Harvard  Medical  School,   he  is  Associate   Professor  of
Otolaryngology,  Head and Neck  Surgery at  Georgetown  University  and George
Washington  University  Medical School, and past Chairman of the Department of
Otolaryngology,  Head and Neck Surgery at the Washington  Hospital Center.  He
is  included in The Best  Doctors in America.  DOB:  05/23/48.  Address:  7536
Pepperell Drive, Bethesda, Maryland 20817.
         PETER W. GAVIAN,  CFA,  Trustee/Director.  Mr. Gavian is President of
Corporate Finance of Washington,  Inc. Formerly,  he was a principal of Gavian
De Vaux  Associates,  an  investment  banking  firm.  He is  also a  Chartered
Financial   Analyst  and  an  accredited  senior  business   appraiser.   DOB:
12/08/32. Address: 3005 Franklin Road North, Arlington, Virginia 22201.
         JOHN G.  GUFFEY,  JR.,  Trustee/Director.  Mr.  Guffey is chairman of
the  Calvert  Social  Investment   Foundation,   organizing  director  of  the
Community  Capital Bank in Brooklyn,  New York, and a financial  consultant to
various  organizations.  In addition, he is a former director of the Community
Bankers Mutual Fund of Denver,  Colorado,  a director of Ariel Funds,  and the
Treasurer  and Director of Silby,  Guffey,  and Co.,  Inc., a venture  capital
firm.  Mr.  Guffey  is a  trustee/director  of  each of the  other  investment
companies in the Calvert Group of Funds,  except for Calvert  Variable Series,
Inc. and Calvert New World Fund, Inc.
        Mr.  Guffey  has  been  advised  that  the   Securities  and  Exchange
Commission  ("SEC")  has entered an order  against him  relating to his former
service as a director of  Community  Bankers  Mutual Fund,  Inc.  This fund is
not  connected  with  any  Calvert  Fund  or  the  Calvert  Group  and  ceased
operations  in  September,  1994.  Mr.  Guffey  consented  to the entry of the
order  without  admitting  or denying  the  findings  in the order.  The order
contains  findings (1) that the Community  Bankers  Mutual  Fund's  prospectus
and statement of additional  information  were materially false and misleading
because  they  misstated  or failed to state  material  facts  concerning  the
pricing of fund  shares  and the  percentage  of  illiquid  securities  in the
fund's  portfolio  and  that Mr.  Guffey,  as a member  of the  fund's  board,
should  have  known  of  these   misstatements  and  therefore   violated  the
Securities  Act of 1933;  (2) that the price of the fund's  shares sold to the
public  was not  based  on the  current  net  asset  value of the  shares,  in
violation  of the  Investment  Company  Act of 1940 (the  "Investment  Company
Act");  and (3) that the board of the fund,  including  Mr.  Guffey,  violated
the  Investment  Company Act by  directing  the filing of a  materially  false
registration  statement.  The order  directed  Mr.  Guffey to cease and desist
from  committing or causing  future  violations  and to pay a civil penalty of
$5,000.  The SEC placed no restrictions  on Mr.  Guffey's  continuing to serve
as a Trustee or Director of mutual funds. DOB:  05/15/48.  Address:  388 Calli
Calina, Santa Fe, New Mexico 87501.
         *BARBARA J. KRUMSIEK,  President and  Trustee/Director.  Ms. Krumsiek
serves as  President,  Chief  Executive  Officer and Vice  Chairman of Calvert
Group,  Ltd.  and as an  officer  and  director  of  each  of  its  affiliated
companies.  She  is a  director  of  Calvert-Sloan  Advisers,  L.L.C.,  and  a
trustee/director  of each of the investment  companies in the Calvert Group of
Funds.  Ms.  Krumsiek is the  President of each of the  investment  companies,
except for Calvert  Social  Investment  Fund,  of which she is the Senior Vice
President.  Prior to joining Calvert Group,  Ms. Krumsiek served as a Managing
Director of Alliance Fund Distributors, Inc. DOB: 08/09/52.
         M. CHARITO  KRUVANT,  Trustee/Director.  Ms. Kruvant is President and
CEO of Creative  Associates  International,  Inc., a firm that  specializes in
human  resources  development,  information  management,  public  affairs  and
private  enterprise  development.  She is also a Director of Calvert  Variable
Series,  Inc., and Acacia Federal Savings Bank. DOB: 12/08/45.  Address:  5301
Wisconsin Avenue, N.W., Washington, D.C. 20015.
         ARTHUR J. PUGH,  Trustee/Director.  Mr. Pugh is a Director of Calvert
Variable  Series,  Inc.,  and serves as a director of Acacia  Federal  Savings
Bank. DOB: 09/24/37. Address: 4823 Prestwick Drive, Fairfax, Virginia 22030.
         *DAVID R. ROCHAT,  Senior Vice  President and  Trustee/Director.  Mr.
Rochat is  Executive  Vice  President  of Calvert  Asset  Management  Company,
Inc.,  Director and Secretary of Grady,  Berwald and Co.,  Inc.,  and Director
and President of Chelsea  Securities,  Inc. He is the Senior Vice President of
First Variable Rate Fund, Calvert Tax-Free  Reserves,  Calvert Municipal Fund,
Inc.,  Calvert Cash Reserves,  and The Calvert Fund. DOB:  10/07/37.  Address:
Box 93, Chelsea, Vermont 05038.
         *D.   WAYNE   SILBY,   Esq.,   Trustee/Director.   Mr.   Silby  is  a
trustee/director  of each of the investment  companies in the Calvert Group of
Funds,  except for Calvert Variable  Series,  Inc. and Calvert New World Fund.
Mr. Silby is  Executive  Chairman of Group Serve,  Inc.,  an internet  company
focused on community building  collaborative  tools, and an officer,  director
and  shareholder  of Silby,  Guffey & Company,  Inc.,  which serves as general
partner  of  Calvert  Social  Venture  Partners  ("CSVP").  CSVP is a  venture
capital firm investing in socially  responsible small companies.  He is also a
Director of Acacia Mutual Life  Insurance  Company.  DOB:  07/20/48.  Address:
1715 18th Street, N.W., Washington, D.C. 20009.
         RENO J. MARTINI,  Senior Vice  President.  Mr.  Martini is a director
and Senior Vice  President of Calvert  Group,  Ltd., and Senior Vice President
and Chief  Investment  Officer of Calvert Asset Management  Company,  Inc. Mr.
Martini is also a director and President of  Calvert-Sloan  Advisers,  L.L.C.,
and a director and officer of Calvert New World Fund. DOB: 1/13/50.
         RONALD M.  WOLFSHEIMER,  CPA,  Treasurer.  Mr.  Wolfsheimer is Senior
Vice  President and Chief  Financial  Officer of Calvert  Group,  Ltd. and its
subsidiaries and an officer of each of the other  investment  companies in the
Calvert Group of Funds.  Mr.  Wolfsheimer  is Vice  President and Treasurer of
Calvert-Sloan Advisers,  L.L.C., and a director of Calvert Distributors,  Inc.
DOB: 07/24/47.
         WILLIAM  M.  TARTIKOFF,  Esq.,  Vice  President  and  Secretary.  Mr.
Tartikoff  is an officer of each of the  investment  companies  in the Calvert
Group of Funds, and is Senior Vice President,  Secretary,  and General Counsel
of Calvert Group,  Ltd., and each of its  subsidiaries.  Mr. Tartikoff is also
Vice President and Secretary of  Calvert-Sloan  Advisers,  L.L.C.,  a director
of Calvert  Distributors,  Inc.,  and is an officer  of Acacia  National  Life
Insurance Company. DOB: 08/12/47.
         DANIEL K. HAYES,  Vice  President.  Mr.  Hayes is Vice  President  of
Calvert  Asset  Management  Company,  Inc.,  and is an  officer of each of the
other investment  companies in the Calvert Group of Funds,  except for Calvert
New World Fund, Inc. DOB: 09/09/50.
         SUSAN  WALKER  BENDER,  Esq.,  Assistant  Secretary.  Ms.  Bender  is
Associate  General  Counsel of Calvert  Group,  Ltd. and an officer of each of
its subsidiaries  and  Calvert-Sloan  Advisers,  L.L.C. She is also an officer
of each of the  other  investment  companies  in the  Calvert  Group of Funds.
DOB: 01/29/59.
         KATHERINE  STONER,   Esq.,   Assistant   Secretary.   Ms.  Stoner  is
Associate  General  Counsel of Calvert  Group,  Ltd. and an officer of each of
its subsidiaries  and  Calvert-Sloan  Advisers,  L.L.C. She is also an officer
of each of the  other  investment  companies  in the  Calvert  Group of Funds.
DOB: 10/21/56.
         IVY WAFFORD DUKE, Esq.,  Assistant  Secretary.  Ms. Duke is Associate
General  Counsel of Calvert  Group and an officer of each of its  subsidiaries
and  Calvert-Sloan  Advisers,  L.L.C.  She is also an  officer  of each of the
other  investment  companies in the Calvert  Group of Funds and  Secretary and
provides  counsel  to the  Calvert  Social  Investment  Foundation.  Prior  to
working  at  Calvert  Group,  Ms.  Duke  was an  Associate  in the  Investment
Management  Group of the Business and Finance  Department at Drinker  Biddle &
Reath. DOB: 09/07/68.
         VICTOR FRYE, Esq.,  Assistant Secretary and Compliance  Officer.  Mr.
Frye is Counsel  and  Compliance  Officer  of Calvert  Group and an officer of
each of its  subsidiaries  and  Calvert-Sloan  Advisers,  L.L.C. He is also an
officer of each of the other  investment  companies  in the  Calvert  Group of
Funds.  Prior to working at Calvert  Group,  Mr.  Frye was Counsel and Manager
of the Compliance Department at The Advisors Group. DOB: 10/15/58.

         The address of directors and officers,  unless  otherwise  noted,  is
4550   Montgomery   Avenue,   Suite   1000N,    Bethesda,    Maryland   20814.
Trustee/Directors  and  officers  of the Fund as a group  own less  than 1% of
the Fund's  outstanding  shares.  Trustee/Directors  marked  with an *, above,
are  "interested  persons" of the Fund,  under the  Investment  Company Act of
1940.  Directors  and officers of the Fund as a group own less than 1% of each
Portfolio's outstanding shares.
         Each of the above persons is a  Trustee/Director  or officer of other
investment  companies  in the Calvert  Group of Funds  except  Calvert  Social
Investment  Fund,  and Calvert World Values Fund,  Inc., of which only Messrs.
Baird,  Guffey,  and Silby and Ms. Krumsiek are among the  trustees/directors;
Calvert Variable Series,  Inc., of which only Messrs.  Blatz,  Diehl, and Pugh
and Mmes.  Krumsiek  and  Kruvant  are among the  directors,  and  Calvert New
World Fund,  Inc.,  of which only and Ms.  Krumsiek and Mr.  Martini are among
the directors.
         The  Audit  Committee  of the  Board  of  Directors  is  composed  of
Messrs. Baird, Blatz,  Feldman,  Guffey and Pugh, and Ms. Kruvant. The Board's
Investment  Policy  Committee  is composed of Messrs.  Borts,  Diehl,  Gavian,
Rochat, and Silby, and Ms. Krumsiek.
         During  fiscal  1998,   trustee/directors   of  the   Portfolios  not
affiliated  with the Fund's  Advisor were paid  $8,377,  $4,299,  $1,578,  and
$1,796,  from the National,  California,  Maryland,  and Virginia  Portfolios,
respectively.  Trustees/Directors  of the Fund not affiliated with the Advisor
currently  receive  an annual fee of  $20,500  for  service as a member of the
Board of  Trustees/Directors  of the Calvert Group of Funds plus a fee of $750
to  $1,500  for each  Board  and  Committee  meeting  attended;  such fees are
allocated among the Funds on the basis of their net assets.
         Trustees/Directors  not  affiliated  with the  Advisor  may  elect to
defer  receipt of all or a  percentage  of their  fees and invest  them in any
fund  in  the  Calvert  of  Funds  through  the  Trustees/Directors   Deferred
Compensation  Plan (shown as "Pension or Retirement  Benefits  Accrued as part
of Fund  Expenses,"  below).  Deferral of the fees is designed to maintain the
parties  in the same  position  as if the fees were  paid on a current  basis.
Management  believes this will have a negligible  effect on the Fund's assets,
liabilities, net assets, and net income per share.

Trustee/Director Compensation Table

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

Name of Trustee/Director

Richard L. Baird, Jr. $1,496            $0                $39,550
Frank H. Blatz, Jr.   $1,327            $1,327            $42,100
Frederick T. Borts    $1,220            $0                $33,250
Charles E. Diehl      $1,327            $1,327            $41,500
Douglas E. Feldman    $1,327            $0                $36,250
Peter W. Gavian       $1,326            $663              $36,250
John G. Guffey, Jr.   $1,272            $0                $62,665
M. Charito Kruvant    $1,328            $532              $36,250
Arthur J. Pugh        $1,327            $0                $41,500
D. Wayne Silby        $1,274            $0                $67,780

*Messrs. Blatz, Diehl, Gavian and Pugh and Ms. Kruvant have chosen to defer
a portion of their compensation. As of December 31, 1998, total deferred
compensation, including dividends and capital appreciation, was $644,247.37,
$672,374.09, $172,445.85, $216,322.53, and $23,295.55, for each
Trustee/Director, respectively.
**The Fund Complex consists of nine (9) registered investment companies.

INVESTMENT ADVISOR

         The Fund's  Investment  Advisor is Calvert Asset Management  Company,
Inc.,  4550  Montgomery  Avenue,  Suite 1000N,  Bethesda,  Maryland  20814,  a
subsidiary  of  Calvert  Group,  Ltd.,  which is a  controlled  subsidiary  of
Ameritas Acacia Mutual Holding Company of Lincoln, Nebraska.
         The  Advisory  Contract  between the Fund and the Advisor will remain
in effect  indefinitely,  provided  continuance  is approved at least annually
by the vote of the  holders of a  majority  of the  outstanding  shares of the
Fund,  or by the  directors  of the  Fund;  and  further  provided  that  such
continuance  is  also  approved  annually  by the  vote of a  majority  of the
directors  of the Fund  who are not  parties  to the  Contract  or  interested
persons of such  parties,  cast in person at a meeting  called for the purpose
of voting on such  approval.  The Contract may be terminated  without  penalty
by  either  party  on  60  days'  prior  written  notice;   it   automatically
terminates in the event of its assignment.
         Under  the  Contract,   the  Advisor   manages  the   investment  and
reinvestment  of the Fund's  assets,  subject to the  direction and control of
the Fund's  Board of  Directors.  For its  services,  the Advisor  receives an
annual fee of 0.60% of the first  $500  million  of each  Portfolio's  average
daily net assets,  0.50% of the next $500  million of such  assets,  and 0.40%
of all assets over $1 billion.
         The advisory fee is payable  monthly.  The Advisor reserves the right
(i)  to  waive  all or a part  of its  fee  and  (ii)  to  compensate,  at its
expense,   broker-dealers   in   consideration   of  their   promotional   and
administrative  services.  During  fiscal  years  1996,  1997,  and 1998,  the
Portfolios paid advisory fees as shown:

                  1996              1997             1998
National          $275,574          $285,023         $396,802
California        $217,159          $204,019         $205,130
Maryland          $72,423           $70,899          $74,404
Virginia          $72,322           $79,695          $84,448

         The Advisor  provides the Fund with  investment  advice and research,
pays the  salaries and fees of all  directors  and  executive  officers of the
Fund who are  principals  of the Advisor,  and pays  certain Fund  advertising
and promotional  expenses.  The Fund pays other  administrative  and operating
expenses,   including:   custodial  fees;  shareholder   servicing,   dividend
disbursing  and transfer  agency fees;  administrative  service fees;  federal
and  state   securities   registration   fees;   insurance   premiums;   trade
association  dues;  interest,  taxes and other business fees;  legal and audit
fees; and brokerage  commissions and other costs  associated with the purchase
and sale of portfolio securities.

ADMINISTRATIVE SERVICES

         Calvert  Administrative  Services Company, a wholly-owned  subsidiary
of Calvert  Group,  Ltd.,  has been  retained  by the Fund to provide  certain
administrative   services   necessary  to  the  conduct  of  each  Portfolio's
affairs.  Such services  include the  preparation  of corporate and regulatory
reports and filings,  and the oversight of portfolio  accounting and the daily
determination  of net  investment  income  and  net  asset  value  per  share.
Calvert  Administrative  Services Company is entitled to receive an annual fee
of 0.10% of each  Portfolio's  average net assets for providing such services.
The fees paid by each Portfolio to Calvert  Administrative  Services  Company,
Inc. for fiscal years 1996, 1997, and 1998 are shown below:

                  1996              1997             1998
National          $45,929           $47,504          $66,134
California        $36,193           $34,003          $34,188
Maryland          $12,071           $11,816          $12,401
Virginia          $12,054           $13,283          $14,075

METHOD OF DISTRIBUTION

         The Fund has entered  into an agreement  with  Calvert  Distributors,
Inc. ("CDI"), 4550 Montgomery Avenue,  Bethesda.  Maryland 20814, whereby CDI,
acting  as  principal  underwriter,   makes  a  continuous  offering  of  each
Portfolio's  securities  on a "best  efforts"  basis.  Under  the terms of the
agreement,  CDI bears all its expenses of providing  services  pursuant to the
agreement,  including  payment  of  any  commissions  and  service  fees.  CDI
receives all sales charges imposed on the  Portfolios'  shares and compensates
broker-dealer  firms for sales of such  shares.  CDI is  entitled to receive a
distribution  fee pursuant to the  Distribution  Plan (see below).  For fiscal
years 1996,  1997, and 1998, CDI received  aggregate sales charges (gross) and
sales charges in excess of the dealer reallowance (net) as shown below:

                1996                  1997                1998
                Gross/Net             Gross/Net           Gross/Net
National      $45,813/$13,952       $40,981/$11,597     $49,679/$8,864
California    $50,884/$14,066       $49,851/$15,411    $37,645/$7,762
Maryland      $12,032/$4,214        $18,892/$7,100     $15,037/$6,053
Virginia      $20,776/$9,039        $20,163/$7,697     $12,662/($30)

         Pursuant  to Rule  12b-1  under the  Investment  Company  Act of 1940
("1940  Act"),  the Fund has adopted a  Distribution  Plan (the "Plan")  which
permit it to pay certain  expenses  associated  with the  distribution  of its
shares,  based on each  Portfolio's  average  daily net assets.  Such expenses
may not exceed,  on an annual  basis,  0.25% of the  National  and  California
Portfolios,   and  0.15%  for  the  Maryland  and  Virginia   Portfolios.   No
Distribution  Plan  expenses  were  paid by any of the  Portfolios  in  fiscal
1996, 1997, and 1998.
         The Plan was approved by the Board of  Trustees/Directors,  including
the  Trustees/Directors  who are not  "interested  persons"  of the  Funds (as
that term is  defined  in the 1940  Act) and who have no  direct  or  indirect
financial  interest in the operation of the Plan or in any agreements  related
to the Plan.  The selection and nomination of the  Trustees/Directors  who are
not  interested  persons of the Fund is  committed to the  discretion  of such
disinterested    Trustees/Directors.    In   establishing    the   Plan,   the
Trustees/Directors  considered  various  factors  including  the amount of the
distribution   fee.  The   Trustees/Directors   determined  that  there  is  a
reasonable  likelihood  that  the  Plan  will  benefit  the  Funds  and  their
shareholders.
         The  Plan  may  be   terminated   by  vote  of  a  majority   of  the
non-interested  Trustees/Directors  who have no direct or  indirect  financial
interest in the Plan,  or by vote of a majority of the  outstanding  shares of
the  Portfolio.  Any change in the Plan that  would  materially  increase  the
distribution  cost to the  Portfolio  requires  approval of the  shareholders;
otherwise,  the Plan may be amended  by the  Trustees/Directors,  including  a
majority of the non-interested Trustees/Directors as described above.
         The Plan will  continue  in effect  for  successive  one-year  terms,
provided that such  continuance is specifically  approved by (i) the vote of a
majority  of the  Trustees/Directors  who  are  not  parties  to the  Plan  or
interested  persons  of any such  party  and who have no  direct  or  indirect
financial  interest  in the  Plan,  and  (ii) the  vote of a  majority  of the
entire Board of Trustees/Directors.
         Apart from the Plan,  the Advisor,  at its  expense,  may incur costs
and pay expenses associated with the distribution of shares of the Fund.
         Certain   broker/dealers,    and/or   other   persons   may   receive
compensation  from the investment  advisor,  underwriter,  or their affiliates
for the sale and  distribution  of the securities or for services to the Fund.
Such  compensation may include  additional  compensation  based on assets held
through  that firm beyond the  regularly  scheduled  rates,  and  finders' fee
payments to firms whose  representatives  are responsible for soliciting a new
account  where the  accountholder  does not choose to  purchase  through  that
firm.

TRANSFER AND SHAREHOLDER SERVICING AGENT

         National Financial Data Services, Inc. ("NFDS"), 330 W. 9th Street,
Kansas City, Missouri 64105, a subsidiary of State Street Bank & Trust, has 
been retained by the Fund to act as transfer agent and dividend disbursing
agent. These responsibilities include: responding to certain shareholder
inquiries and instructions, crediting and debiting shareholder accounts for
purchases and redemptions of Fund shares and confirming such transactions, and
daily updating of shareholder accounts to reflect declaration and payment of
dividends.
         Calvert  Shareholder   Services,   Inc.  ("CSSI"),   4550  Montgomery
Avenue,  Bethesda,  Maryland  20814, a subsidiary of Calvert Group,  Ltd., has
been retained by the Fund to act as shareholder  servicing agent.  Shareholder
servicing  responsibilities  include  responding to shareholder  inquiries and
instructions  concerning their accounts,  entering any telephoned purchases or
redemptions  into the NFDS system,  maintenance  of  broker-dealer  data,  and
preparing  and  distributing   statements  to  shareholders   regarding  their
accounts.  Calvert  Shareholder  Services,  Inc. was the sole  transfer  agent
prior to January 1, 1998.
         For these  services,  NFDS and  Calvert  Shareholder  Services,  Inc.
receive a fee based on the  number of  shareholder  accounts  and  shareholder
transactions, per Portfolio.

INDEPENDENT ACCOUNTANTS AND CUSTODIANS

         PricewaterhouseCoopers   LLP,  250  West  Pratt  Street,   Baltimore,
Maryland  21201,  has been  selected  by the  Board of  Directors  to serve as
independent  accountants  of the Fund for fiscal year 1999.  State Street Bank
& Trust  Company,  N.A.,  225 Franklin  Street,  Boston,  MA 02110,  serves as
custodian of the  Portfolios'  investments.  First  National Bank of Maryland,
25 South  Charles  Street,  Baltimore,  Maryland  21203 acts as  custodian  of
certain  of cash  assets.  Neither  custodian  has any  part in  deciding  the
Portfolio  investment  policies  or the  choice of  securities  that are to be
purchased or sold by each Portfolio.

PORTFOLIO TRANSACTIONS

         Portfolio   transactions   are  undertaken  on  the  basis  of  their
desirability  from an  investment  standpoint.  Investment  decisions  and the
choice of brokers  and dealers  are made by the  Advisor  under the  direction
and supervision of the Board of Trustees/Directors.
         Broker-dealers  who execute portfolio  transactions on behalf of each
Portfolio are selected on the basis of their  professional  capability and the
value and quality of their services.  The Advisor  reserves the right to place
orders for the purchase or sale of portfolio  securities  with  broker-dealers
who have sold shares of each  Portfolio  or who  provide it with  statistical,
research,  or  other  information  and  services.   Although  any  statistical
research or other information and services  provided by broker-dealers  may be
useful to the Advisor,  the dollar value of such  information  and services is
generally  indeterminable,  and its  availability or receipt does not serve to
materially reduce the Advisor's normal research activities or expenses.
         While the  Advisor  selects  brokers  primarily  on the basis of best
execution,  in some  cases the  Advisor  may  direct  transactions  to brokers
based  on  the  quality  and  amount  of  the  research  and  research-related
services  which the brokers  provide to them.  These  services are of the type
described  in Section  28(e) of the  Securities  Exchange  Act of 1934 and may
include  analyses  of the  business  or  prospects  of a company,  industry or
economic sector, or statistical and pricing services.
         If,  in the  judgment  of the  Advisor,  the Fund or  other  accounts
managed by them will be  benefited by  supplemental  research  services,  they
are  authorized  to pay  brokerage  commissions  to a broker  furnishing  such
services  which are in excess of  commissions  which  another  broker may have
charged for effecting the same  transaction.  These research  services include
advice,  either directly or through publications or writings,  as to the value
of  securities,  the  advisability  of  investing  in,  purchasing  or selling
securities,  and the  availability  of  securities or purchasers or sellers of
securities;   furnishing   of  analyses   and  reports   concerning   issuers,
securities  or  industries;  providing  information  on  economic  factors and
trends;  assisting  in  determining  portfolio  strategy;  providing  computer
software  used  in  security   analyses;   providing   portfolio   performance
evaluation  and  technical  market  analyses;  and  providing  other  services
relevant to the investment  decision making  process.  It is the policy of the
Advisor that such  research  services will be used for the benefit of the Fund
as well as other Calvert Group funds and managed accounts.
         The Advisor may also execute  portfolio  transactions with or through
broker-dealers  who have sold shares of each  Portfolio.  However,  such sales
will  not  be a  qualifying  or  disqualifying  factor  in  a  broker-dealer's
selection nor will the selection of any  broker-dealer  be based on the volume
of shares sold. The Advisor or its affiliate may  compensate,  at its expense,
broker-dealers  in  consideration  of  their  promotional  and  administrative
services.
         The  portfolio  turnover  is shown  below for  fiscal  years 1997 and
1998:

                  1997         1998
National          29%          44%
California        48%          12%
Maryland          13%          24%
Virginia          8%           36%
GENERAL INFORMATION

         The  Fund  was   organized  as  a   corporation   under  the  General
Corporation  Law of the State of Maryland  on  February 4, 1992.  The Fund has
four  Portfolios:   Calvert  National  Municipal  Intermediate  Fund,  Calvert
California   Municipal   Intermediate   Fund,   Calvert   Maryland   Municipal
Intermediate  Fund, and Calvert Virginia  Municipal  Intermediate  Fund. Prior
to March 1, 1994,  Calvert National  Municipal  Intermediate Fund was known as
Calvert Intermediate Municipal Fund.
         Each Portfolio will send its shareholders  unaudited  semi-annual and
audited annual reports that will include the  Portfolio's  net asset value per
share,  portfolio  securities,   income  and  expenses,  and  other  financial
information.
         Each  share  of  the  Portfolio  represents  an  equal  proportionate
interest  in that  Portfolio  with each other  share and is  entitled  to such
dividends and  distributions  out of the income  belonging to the Portfolio as
declared by the Board.  Upon any  liquidation of the  Portfolio,  shareholders
are entitled to share pro rata in the net assets available for distribution.
         This  Statement of  Additional  Information  does not contain all the
information in the Fund's registration  statement.  The registration statement
is on file with the  Securities  and Exchange  Commission  and is available to
the public.

CONTROL PERSONS AND PRINCIPAL HOLDERS
OF SECURITIES

         As of April 20, 1999,  the following  shareholder(s)  owned of record
5% or more of shares as shown below:

         Name and Address                            % of Ownership

National
         Robert Taishoff, Trustee                    7.14%
         L. Taishoff Flint Trust
         Annapolis, Maryland

         John Swanson                                8.93%
         McMurray, Pennsylvania

California
         Catalyst Productions                        13.43%
         Oakland, California

         National City Bank Kentucky                 7.31%
         Trustee Anchorage Trust
         Cleveland, Ohio

         James Bochnowski                            5.47%
         Atherton, California

                                   APPENDIX

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

Municipal Bond and Note Ratings

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

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



                               LETTER OF INTENT

                           
Date

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

Ladies and Gentlemen:

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

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

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

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

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

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

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

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

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

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

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

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


                                                     
Dealer

                                                     
Name of Investor(s)

By                                                   
     Authorized Signer

                                                     
Address

                                                     
Signature of Investor(s)

                                                     
Date

                                                     
Signature of Investor(s)

                                                     
Date


<PAGE>

PART C. OTHER INFORMATION


Item 23. Exhibits

         1.  Underwriting Agreement, incorporated by reference to
Registrant's Post-Effective Amendment No. 15, filed April 30, 1998,
accession number 0000882671-98-000012.

         3.(i)  Articles of Incorporation, (incorporated by reference to
Registrant's Pre-Effective Amendment No. 2, April 27, 1992, and as amended,
incorporated by reference to Registrant's Pre-Effective Amendment No. 3, May
21, 1992).

         3.(ii)  By-Laws (incorporated by reference to Registrant's
Pre-Effective Amendment No. 2, April 27, 1992).

         23.  Opinion and Consent of Counsel as to Legality of Shares Being
Registered, filed herewith.

         23A.  Consent of Independent Accountants to use of report, filed
herewith.

         99.B5.  Investment Advisory Contract, filed herewith.

         99.B7.  Directors' Deferred Compensation Agreement (incorporated by
reference to Registrant's Pre-Effective Amendment No. 2, April 27, 1992).

         99.B8.  Custodial Contract (incorporated by reference to
Registrant's Pre-Effective Amendment No. 2, April 27, 1992).

         99.B9.a.  Transfer Agency Contract and Shareholder Servicing
Contract, incorporated by reference to Registrant's Post-Effective Amendment
No. 15, filed April 30, 1998, accession number 0000882671-98-000012.

         99.B9.b.  Administrative Services Agreement (incorporated by
reference to Registrant's Pre-Effective Amendment No. 2, April 27, 1992).

         99.B9.c.  Multiple-class Plan pursuant to Investment Company Act of
1940 Rule 18f-3, incorporated by reference to Registrant's Post-Effective
Amendment No. 15, filed April 30, 1998, accession number
0000882671-98-000012.

         99.B15.  Plan of Distribution for Class A Shares, incorporated by
reference to Registrant's Post-Effective Amendment No. 13, April 30, 1996
accession number 0000882671-98-000010; for Class B and C Shares,
incorporated by reference to Registrant's Post-Effective Amendment No. 15,
filed April 30, 1998, accession number 0000882671-98-000012.


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

         Not applicable.


Item 25. Indemnification

         Registrant's Bylaws, Exhibit 2 to this Registration Statement,
provide that officers and directors will be indemnified by the Fund against
liabilities and expenses incurred by such persons in connection with
actions, suits, or proceedings arising out of their offices or duties of
employment, except that no indemnification can be made to a person who has
been adjudged liable of willful misfeasance, bad faith, gross negligence, or
reckless disregard of duties. In the absence of such an adjudication, the
determination of eligibility for indemnification shall be made by
independent counsel in a written opinion or by the vote of a majority of a
quorum of directors who are neither "interested persons" of Registrant, as
that term is defined in Section 2(a)(19) of the Investment Company Act of
1940, nor parties to the proceeding.

         Registrant's Articles of Incorporation also provides that
Registrant may purchase and maintain liability insurance on behalf of any
officer, trustee, employee or agent against any liabilities arising from
such status. In this regard, Registrant maintains a Directors & Officers
(Partners) Liability Insurance Policy with Chubb Group of Insurance
Companies, 15 Mountain View Road, Warren, New Jersey 07061, providing
Registrant with $5 million in directors and officers liability coverage,
plus $5 million in excess directors and officers liability coverage for the
independent trustees/directors only. Registrant also maintains an $8 million
Investment Company Blanket Bond issued by ICI Mutual Insurance Company, P.O.
Box 730, Burlington, Vermont, 05402.


Item 26. Business and Other Connections of Investment Adviser

                           Name of Company, Principal
Name                       Business and Address                   Capacity


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Victor Frye                Calvert Group, Ltd.                    Officer
                           Holding Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Administrative Services Co.    Officer
                           Service Company
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ---------------
                           Calvert Asset Management Co., Inc.     Officer
                           Investment Advisor
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Shareholder Services, Inc.     Officer
                           Transfer Agent
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           Calvert Distributors, Inc.             Officer
                           Broker-Dealer
                           4550 Montgomery Avenue
                           Bethesda, Maryland 20814
                           ----------------
                           The Advisors Group, Inc.               Counsel
                           Broker-Dealer and                      and
                           Investment Advisor                     Manager
Compliance
                           7315 Wisconsin Avenue
                           Bethesda, Maryland 20814
                           ---------------

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

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


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

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

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

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

Item 27. Principal Underwriters

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

         (b)      Positions of Underwriter's Officers and Directors

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

Barbara J. Krumsiek        Director and President         President and
Trustee

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

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

Craig Cloyed               Senior Vice President          None

Karen Becker               Vice President, Operations     None

Steve Cohen                Vice President                 None

Geoffrey Ashton            Regional Vice President        None

Martin Brown               Regional Vice President        None

Bill Hairgrove             Regional Vice President        None

Janet Haley                Regional Vice President        None

Steve Himber               Regional Vice President        None

Ben Ogbogu                 Regional Vice President        None

Tom Stanton                Regional Vice President        None

Christine Teske            Regional Vice President        None

Susan Walker Bender        Assistant Secretary            Assistant Secretary

Katherine Stoner           Assistant Secretary            Assistant Secretary

Ivy Wafford Duke           Assistant Secretary            Assistant Secretary

Victor Frye                Assistant Secretary            Assistant Secretary
                           & Compliance Officer           & Compliance Ofcr.

         (c)      Inapplicable.


Item 28. Location of Accounts and Records

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


Item 29. Management Services

         Not Applicable

Item 30. Undertakings

         Not Applicable

         SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all
of the requirements for effectiveness of this registration statement under
Rule 485(b) under the Securities Act and has duly caused this registration
statement to be signed on its behalf by the undersigned, duly authorized, in
the City of Bethesda, and State of Maryland, on the 27th day of April, 1999.


CALVERT MUNICIPAL FUND, INC.

By:
_______________**__________________
Barbara J. Krumsiek
President and Director

SIGNATURES

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


Signature                           Title                     Date


__________**____________            President and             4/27/99
Barbara J. Krumsiek                 Trustee (Principal Executive Officer)


__________**____________            Principal Accounting      4/27/99
Ronald M. Wolfsheimer               Officer


__________**____________            Trustee                   4/27/99
Richard L. Baird, Jr.


__________**____________            Trustee                   4/27/99
Frank H. Blatz, Jr., Esq.


__________**____________            Trustee                   4/27/99
Frederick T. Borts, M.D.


__________**____________            Trustee                   4/27/99
Charles E. Diehl


__________**____________            Trustee                   4/27/99
Douglas E. Feldman


__________**____________            Trustee                   4/27/99
Peter W. Gavian


__________**____________            Trustee                   4/27/99
John G. Guffey, Jr.


__________**____________            Trustee                   4/27/99
M. Charito Kruvant


__________**____________            Trustee                   4/27/99
Arthur J. Pugh


__________**____________            Trustee                   4/27/99
David R. Rochat


__________**____________            Trustee                   4/27/99
D. Wayne Silby


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

EXHIBIT INDEX

Form N-1A
Item No.

Ex-23 Form of Opinion and Consent of Counsel

Ex-23a Auditors' Consent to file

Ex-24 Power of Attorney

Ex-27 Financial Data Schedules (4)

Ex-99.B5.  Investment Advisory Agreement






                              POWER OF ATTORNEY


         I, the  undersigned  Trustee/Director  of Calvert  Social  Investment
Fund,  Calvert  World  Values  Fund,  Inc.,  Calvert  Variable  Series,  Inc.,
Calvert  New  World  Fund,  Inc.,  First  Variable  Rate  Fund for  Government
Income,  Calvert Tax-Free  Reserves,  Calvert Cash Reserves,  The Calvert Fund
and Calvert  Municipal  Fund, Inc. (each,  respectively,  the "Fund"),  hereby
constitute Ronald M. Wolfsheimer,  William M. Tartikoff,  Susan Walker Bender,
Katherine  Stoner,  Lisa  Crossley  Newton,  and Ivy Wafford  Duke my true and
lawful  attorneys,  with full power to each of them,  to sign for me and in my
name  in  the  appropriate   capacities,   all  registration   statements  and
amendments  filed by the Fund with any federal or state agency,  and to do all
such things in my name and behalf  necessary for  registering  and maintaining
registration or exemptions  from  registration of the Fund with any government
agency in any jurisdiction, domestic or foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 2, 1998
Date                                        /Signature/

Katherine Stoner                            Barbara J. Krumsiek
Witness                                     Name of Director


<PAGE>


                              POWER OF ATTORNEY

         I, the  undersigned  Trustee/Director  of Calvert  Social  Investment
Fund,  First  Variable  Rate  Fund for  Government  Income,  Calvert  Tax-Free
Reserves,  Calvert  Cash  Reserves,  The Calvert  Fund and  Calvert  Municipal
Fund, Inc.  (each,  respectively,  the "Fund"),  hereby  constitute  Ronald M.
Wolfsheimer,  William M.  Tartikoff,  Susan Walker Bender,  Katherine  Stoner,
Lisa  Crossley  Newton,  and Ivy  Wafford  Duke my true and lawful  attorneys,
with  full  power  to  each  of  them,  to  sign  for me and in my name in the
appropriate  capacities,  all registration  statements and amendments filed by
the Fund with any  federal or state  agency,  and to do all such  things in my
name and behalf  necessary for  registering  and  maintaining  registration or
exemptions  from  registration  of the Fund with any government  agency in any
jurisdiction, domestic or foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 2, 1998
Date                                        /Signature/

Susan Walker Bender                         Richard L. Baird, Jr.
Witness                                     Name of Trustee/Director


<PAGE>

                              POWER OF ATTORNEY


         I, the  undersigned  Trustee/Director  of  Calvert  Variable  Series,
Inc.,  First  Variable  Rate  Fund for  Government  Income,  Calvert  Tax-Free
Reserves,  Calvert  Cash  Reserves,  The Calvert  Fund and  Calvert  Municipal
Fund, Inc.  (each,  respectively,  the "Fund"),  hereby  constitute  Ronald M.
Wolfsheimer,  William M.  Tartikoff,  Susan Walker Bender,  Katherine  Stoner,
Lisa  Crossley  Newton,  and Ivy  Wafford  Duke my true and lawful  attorneys,
with  full  power  to  each  of  them,  to  sign  for me and in my name in the
appropriate  capacities,  all registration  statements and amendments filed by
the Fund with any  federal or state  agency,  and to do all such  things in my
name and behalf  necessary for  registering  and  maintaining  registration or
exemptions  from  registration  of the Fund with any government  agency in any
jurisdiction, domestic or foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 3, 1998
Date                                        /Signature/

Frank H. Blatz, Jr.                         Charles E. Diehl
Witness                                     Name of Director


<PAGE>


                              POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and
amendments filed by the Funds with any federal or state agency, and to do
all such things in my name and behalf necessary for registering and
maintaining registration or exemptions from registration of the Funds with
any government agency in any jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in
my name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds,
the signing is automatically ratified and confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         Douglas E. Feldman
Witness                                     Name of Trustee/Director


<PAGE>


                              POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and
amendments filed by the Funds with any federal or state agency, and to do
all such things in my name and behalf necessary for registering and
maintaining registration or exemptions from registration of the Funds with
any government agency in any jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in
my name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds,
the signing is automatically ratified and confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         Peter W. Gavian
Witness                                     Name of Trustee/Director


<PAGE>


                              POWER OF ATTORNEY


         I, the  undersigned  Trustee/Director  of Calvert  Social  Investment
Fund,   Calvert  World  Values  Fund,  Inc.,  First  Variable  Rate  Fund  for
Government  Income,  Calvert  Tax-Free  Reserves,  Calvert Cash Reserves,  The
Calvert  Fund and  Calvert  Municipal  Fund,  Inc.  (each,  respectively,  the
"Fund"),  hereby  constitute  Ronald M.  Wolfsheimer,  William  M.  Tartikoff,
Susan Walker Bender,  Katherine Stoner,  Lisa Crossley Newton, and Ivy Wafford
Duke my true and lawful  attorneys,  with full power to each of them,  to sign
for  me  and  in my  name  in the  appropriate  capacities,  all  registration
statements  and  amendments  filed  by the  Fund  with  any  federal  or state
agency,  and to do all  such  things  in my  name  and  behalf  necessary  for
registering  and maintaining  registration or exemptions from  registration of
the  Fund  with  any  government  agency  in  any  jurisdiction,  domestic  or
foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 2, 1998
Date                                        /Signature/

M. Charito Kruvant                          John G. Guffey, Jr.
Witness                                     Name of Trustee/Director


<PAGE>


                              POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and
amendments filed by the Funds with any federal or state agency, and to do
all such things in my name and behalf necessary for registering and
maintaining registration or exemptions from registration of the Funds with
any government agency in any jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in
my name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds,
the signing is automatically ratified and confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.

May 7, 1997
Date                                        /Signature/

Edwidge Saint-Felix                         M. Charito Kruvant
Witness                                     Name of Trustee/Director


<PAGE>


                              POWER OF ATTORNEY


         I, the  undersigned  Trustee/Director  of  Calvert  Variable  Series,
Inc.,  First  Variable  Rate  Fund for  Government  Income,  Calvert  Tax-Free
Reserves,  Calvert  Cash  Reserves,  The Calvert  Fund and  Calvert  Municipal
Fund, Inc.  (each,  respectively,  the "Fund"),  hereby  constitute  Ronald M.
Wolfsheimer,  William M.  Tartikoff,  Susan Walker Bender,  Katherine  Stoner,
Lisa  Crossley  Newton,  and Ivy  Wafford  Duke my true and lawful  attorneys,
with  full  power  to  each  of  them,  to  sign  for me and in my name in the
appropriate  capacities,  all registration  statements and amendments filed by
the Fund with any  federal or state  agency,  and to do all such  things in my
name and behalf  necessary for  registering  and  maintaining  registration or
exemptions  from  registration  of the Fund with any government  agency in any
jurisdiction, domestic or foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 3, 1998
Date                                        /Signature/

Frank H. Blatz, Jr.                         Arthur James Pugh
Witness                                     Name of Trustee/Director


<PAGE>


                              POWER OF ATTORNEY


         I, the undersigned Trustee/Director of First Variable Rate Fund for
Government Income, Calvert Tax-Free Reserves, Calvert Cash Reserves, The
Calvert Fund, and Calvert Municipal Fund, Inc. (collectively, the "Funds"),
hereby constitute Ronald M. Wolfsheimer, William M. Tartikoff, Susan Walker
Bender, Katherine Stoner, Lisa Crossley, and Ivy Wafford Duke my true and
lawful attorneys, with full power to each of them, to sign for me and in my
name in the appropriate capacities, all registration statements and
amendments filed by the Funds with any federal or state agency, and to do
all such things in my name and behalf necessary for registering and
maintaining registration or exemptions from registration of the Funds with
any government agency in any jurisdiction, domestic or foreign.

         The same persons are authorized generally to do all such things in
my name and behalf to comply with the provisions of all federal, state and
foreign laws, regulations, and policy pronouncements affecting the Funds,
including, but not limited to, the Securities Act of 1933, the Securities
Exchange Act of 1934, the Investment Company Act of 1940, the Investment
Advisers Act of 1940, and all state laws regulating the securities industry.

         The same persons are further authorized to sign my name to any
document needed to maintain the lawful operation of the Funds in connection
with any transaction approved by the Board of Trustee/Directors.

         When any of the above-referenced attorneys signs my name to any
document in connection with maintaining the lawful operation of the Funds,
the signing is automatically ratified and confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


May 7, 1997
Date                                        /Signature/

Katherine Stoner                            David R. Rochat
Witness                                     Name of Trustee/Director


<PAGE>


                              POWER OF ATTORNEY


         I, the  undersigned  Trustee/Director  of Calvert  Social  Investment
Fund,   Calvert  World  Values  Fund,  Inc.,  First  Variable  Rate  Fund  for
Government  Income,  Calvert  Tax-Free  Reserves,  Calvert Cash Reserves,  The
Calvert  Fund and  Calvert  Municipal  Fund,  Inc.  (each,  respectively,  the
"Fund"),  hereby  constitute  Ronald M.  Wolfsheimer,  William  M.  Tartikoff,
Susan Walker Bender,  Katherine Stoner,  Lisa Crossley Newton, and Ivy Wafford
Duke my true and lawful  attorneys,  with full power to each of them,  to sign
for  me  and  in my  name  in the  appropriate  capacities,  all  registration
statements  and  amendments  filed  by the  Fund  with  any  federal  or state
agency,  and to do all  such  things  in my  name  and  behalf  necessary  for
registering  and maintaining  registration or exemptions from  registration of
the  Fund  with  any  government  agency  in  any  jurisdiction,  domestic  or
foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 2, 1998
Date                                        /Signature/

Barbara J. Krumsiek                         D. Wayne Silby
Witness                                     Name of Trustee/Director


<PAGE>



                              POWER OF ATTORNEY


         I, the undersigned  Trustee/Director  of First Variable Rate Fund for
Government  Income,  Calvert  Tax-Free  Reserves,  Calvert Cash Reserves,  The
Calvert  Fund and  Calvert  Municipal  Fund,  Inc.  (each,  respectively,  the
"Fund"),  hereby  constitute  Ronald M.  Wolfsheimer,  William  M.  Tartikoff,
Susan Walker Bender,  Katherine Stoner,  Lisa Crossley Newton, and Ivy Wafford
Duke my true and lawful  attorneys,  with full power to each of them,  to sign
for  me  and  in my  name  in the  appropriate  capacities,  all  registration
statements  and  amendments  filed  by the  Fund  with  any  federal  or state
agency,  and to do all  such  things  in my  name  and  behalf  necessary  for
registering  and maintaining  registration or exemptions from  registration of
the  Fund  with  any  government  agency  in  any  jurisdiction,  domestic  or
foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


September 16, 1998
Date                                        /Signature/

John E. Dudley                              Frederick Borts, M.D.
Witness                                     Name of Trustee/Director


<PAGE>


                              POWER OF ATTORNEY


         I, the  undersigned  Trustee/Director  of  Calvert  Variable  Series,
Inc.,  First  Variable  Rate  Fund for  Government  Income,  Calvert  Tax-Free
Reserves,  Calvert  Cash  Reserves,  The Calvert  Fund and  Calvert  Municipal
Fund, Inc.  (each,  respectively,  the "Fund"),  hereby  constitute  Ronald M.
Wolfsheimer,  William M.  Tartikoff,  Susan Walker Bender,  Katherine  Stoner,
Lisa  Crossley  Newton,  and Ivy  Wafford  Duke my true and lawful  attorneys,
with  full  power  to  each  of  them,  to  sign  for me and in my name in the
appropriate  capacities,  all registration  statements and amendments filed by
the Fund with any  federal or state  agency,  and to do all such  things in my
name and behalf  necessary for  registering  and  maintaining  registration or
exemptions  from  registration  of the Fund with any government  agency in any
jurisdiction, domestic or foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 3, 1998
Date                                        /Signature/

Elizabeth G. Murray                         Frank H. Blatz, Jr.
Witness                                     Name of Director


<PAGE>


                              POWER OF ATTORNEY


         I,  the  undersigned  officer  of  Calvert  Social  Investment  Fund,
Calvert World Values Fund, Inc.,  Calvert Variable Series,  Inc.,  Calvert New
World Fund,  Inc.,  First  Variable Rate Fund for Government  Income,  Calvert
Tax-Free  Reserves,  Calvert  Cash  Reserves,  The  Calvert  Fund and  Calvert
Municipal Fund,  Inc.  (each,  respectively,  the "Fund"),  hereby  constitute
Ronald M. Wolfsheimer,  William M. Tartikoff,  Susan Walker Bender,  Katherine
Stoner,  Lisa  Crossley  Newton,  and Ivy  Wafford  Duke my  true  and  lawful
attorneys,  with full power to each of them,  to sign for me and in my name in
the appropriate  capacities,  all registration statements and amendments filed
by the Fund with any  federal or state  agency,  and to do all such  things in
my name and behalf  necessary for registering and maintaining  registration or
exemptions  from  registration  of the Fund with any government  agency in any
jurisdiction, domestic or foreign.

         The same  persons are  authorized  generally to do all such things in
my name and behalf to comply with the  provisions  of all  federal,  state and
foreign  laws,  regulations,  and policy  pronouncements  affecting  the Fund,
including,  but not limited to, the  Securities  Act of 1933,  the  Securities
Exchange  Act of 1934,  the  Investment  Company Act of 1940,  the  Investment
Advisers Act of 1940,  the Internal  Revenue Code of 1986,  and all state laws
regulating the securities industry.

         The  same  persons  are  further  authorized  to  sign my name to any
document needed to maintain the lawful operation of the Fund.

         When  any of the  above-referenced  attorneys  signs  my  name to any
document in  connection  with  maintaining  the lawful  operation of the Fund,
the signing is  automatically  ratified and  confirmed by me by virtue of this
Power of Attorney.

         WITNESS my hand on the date set forth below.


June 2, 1998
Date                                        /Signature/

Edwidge Saint-Felix                         Ronald M. Wolfsheimer
Witness                                     Name of Officer






Exhibit 23


April 27, 1999

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


         Re:      Exhibit 10, Form N-1A
                  Calvert Municipal Fund, Inc.
                  File Numbers 811-6525 and 33-44968


Ladies and Gentlemen:


As counsel to Calvert Group, Ltd., it is my opinion that the securities
being registered by this Post-Effective Amendment No. 17 will be legally
issued, fully paid and non-assessable when sold.  My opinion is based on an
examination of documents related to Calvert Municipal Fund, Inc. (the
"Fund"), including its Articles of Incorporation, other original or
photostatic copies of Fund records, certificates of public officials,
documents, papers, statutes, or authorities as I deemed necessary to form
the basis of this opinion.

I therefore consent to filing this opinion of counsel with the Securities
and Exchange Commission as an Exhibit to the Fund's Post-Effective Amendment
No. 17 to its Registration Statement.

Sincerely,

/s/ Katherine Stoner

Katherine Stoner
Associate General Counsel




PricewaterhouseCoopers logo

PricewaterhouseCoopers LLP
250 West Pratt Street
Suite 2100
Baltimore MD 21201-2304
Telephone (410) 783 7600
Facsimile (410) 783 7680


CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in Post-Effective Amendment No.
17 to the Registration Statement of Calvert National, California, Maryland
Virginia (four portfolios comprising Calvert Municipal Fund, Inc., hereafter
referred to as the :Funds") on Form N-1A (File Number 33-44968 and 811-6525)
of our reports dated February 10, 1999, on our audit of the financial
statements and financial highlights of the Funds, which report is included in
the Annual Report to Shareholders for the year ended December 31, 1998, which
is incorporated by reference in the Registration Statement. We also consent to
the reference to our firm under the caption "Financial Highlights" in the
Prospectus and "Independent Accountants" in the Statement of Additional
Information.

/s/
PricewaterhouseCoopers LLP


Baltimore, Maryland
April 27, 1999






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<CIK> 0000882671
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<SERIES>
   <NUMBER> 133
   <NAME> CALVERT CALIFORNIA MUNICIPAL INTERMEDIATE FUND
<MULTIPLIER> 1000
       
<S>                             <C>
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<PERIOD-START>                             JUL-01-1998
<PERIOD-END>                               DEC-31-1998
<INVESTMENTS-AT-COST>                            34625
<INVESTMENTS-AT-VALUE>                           36396
<RECEIVABLES>                                      520
<ASSETS-OTHER>                                      95
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   37011
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                           47
<TOTAL-LIABILITIES>                                 47
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         35775
<SHARES-COMMON-STOCK>                             3442
<SHARES-COMMON-PRIOR>                             3300
<ACCUMULATED-NII-CURRENT>                           23
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (605)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          1771
<NET-ASSETS>                                     36964
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 1746
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     300
<NET-INVESTMENT-INCOME>                           1446
<REALIZED-GAINS-CURRENT>                           243
<APPREC-INCREASE-CURRENT>                          129
<NET-CHANGE-FROM-OPS>                             1818
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1479)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           8558
<NUMBER-OF-SHARES-REDEEMED>                     (8101)
<SHARES-REINVESTED>                               1082
<NET-CHANGE-IN-ASSETS>                            1878
<ACCUMULATED-NII-PRIOR>                             55
<ACCUMULATED-GAINS-PRIOR>                        (848)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              205
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    309
<AVERAGE-NET-ASSETS>                             34188
<PER-SHARE-NAV-BEGIN>                            10.63
<PER-SHARE-NII>                                   0.45
<PER-SHARE-GAIN-APPREC>                           0.12
<PER-SHARE-DIVIDEND>                            (0.46)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.74
<EXPENSE-RATIO>                                   0.88
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

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<NAME> CALVERT MUNICIPAL FUND
<SERIES>
   <NUMBER> 123
   <NAME> CALVERT NATIONAL MUNICIPAL INTERMEDIATE FUND
<MULTIPLIER> 1000
       
<S>                             <C>
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<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JUL-01-1998
<PERIOD-END>                               DEC-31-1998
<INVESTMENTS-AT-COST>                            68184
<INVESTMENTS-AT-VALUE>                           70653
<RECEIVABLES>                                     2565
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<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   73230
<PAYABLE-FOR-SECURITIES>                          2045
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          120
<TOTAL-LIABILITIES>                               2165
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         68125
<SHARES-COMMON-STOCK>                             6570
<SHARES-COMMON-PRIOR>                             4535
<ACCUMULATED-NII-CURRENT>                           22
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (449)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          2469
<NET-ASSETS>                                     70167
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 3381
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     624
<NET-INVESTMENT-INCOME>                           2757
<REALIZED-GAINS-CURRENT>                          1920
<APPREC-INCREASE-CURRENT>                       (1013)
<NET-CHANGE-FROM-OPS>                             3664
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (2804)
<DISTRIBUTIONS-OF-GAINS>                         (548)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          39235
<NUMBER-OF-SHARES-REDEEMED>                    (20150)
<SHARES-REINVESTED>                               2734
<NET-CHANGE-IN-ASSETS>                           22131
<ACCUMULATED-NII-PRIOR>                             69
<ACCUMULATED-GAINS-PRIOR>                        (923)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              397
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    640
<AVERAGE-NET-ASSETS>                             66134
<PER-SHARE-NAV-BEGIN>                            10.79
<PER-SHARE-NII>                                   0.45
<PER-SHARE-GAIN-APPREC>                           0.13
<PER-SHARE-DIVIDEND>                            (0.46)
<PER-SHARE-DISTRIBUTIONS>                       (0.09)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.82
<EXPENSE-RATIO>                                   0.94
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

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<TABLE> <S> <C>

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<CIK> 0000882671
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<SERIES>
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   <NAME> CALVERT MARYLAND MUNICIPAL INTERMEDIATE FUND
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JUL-01-1998
<PERIOD-END>                               DEC-31-1998
<INVESTMENTS-AT-COST>                            11288
<INVESTMENTS-AT-VALUE>                           11918
<RECEIVABLES>                                      204
<ASSETS-OTHER>                                      61
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   12183
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                           18
<TOTAL-LIABILITIES>                                 18
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         11669
<SHARES-COMMON-STOCK>                             2336
<SHARES-COMMON-PRIOR>                             2400
<ACCUMULATED-NII-CURRENT>                           18
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (152)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                           630
<NET-ASSETS>                                     12165
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                  628
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                     116
<NET-INVESTMENT-INCOME>                            512
<REALIZED-GAINS-CURRENT>                           142
<APPREC-INCREASE-CURRENT>                         (64)
<NET-CHANGE-FROM-OPS>                              590
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (520)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           2659
<NUMBER-OF-SHARES-REDEEMED>                     (3434)
<SHARES-REINVESTED>                                433
<NET-CHANGE-IN-ASSETS>                           (272)
<ACCUMULATED-NII-PRIOR>                             26
<ACCUMULATED-GAINS-PRIOR>                        (295)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               74
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    120
<AVERAGE-NET-ASSETS>                             12401
<PER-SHARE-NAV-BEGIN>                             5.18
<PER-SHARE-NII>                                   0.21
<PER-SHARE-GAIN-APPREC>                           0.04
<PER-SHARE-DIVIDEND>                            (0.22)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               5.21
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<AVG-DEBT-PER-SHARE>                                 0
        

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<NAME> CALVERT MUNICIPAL FUND
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   <NUMBER> 153
   <NAME> CALVERT VIRGINIA MUNICIPAL INTERMEDIATE FUND
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</TABLE>




Investment Advisory Agreement
Calvert Municipal Fund, Inc.


         INVESTMENT ADVISORY AGREEMENT, made this 1st day of March, 1999, by
and between CALVERT ASSET MANAGEMENT COMPANY, INC., a Delaware corporation
(the "Advisor"), and Calvert Municipal Fund, Inc., a Maryland corporation
(the "Corporation"), both having their principal place of business at 4550
Montgomery Avenue, Bethesda, Maryland.

         WHEREAS, the Corporation is registered as an investment company
under the Investment Company Act of 1940, as amended (the "1940 Act"), for
the purpose of investing and reinvesting its assets in securities, offering
separate series ("Fund(s)"), as set forth in its Articles of Incorporation,
its Bylaws and its registration statements under the 1940 Act and the
Securities Act of 1933 (the "1933 Act"), as amended, and the Corporation
desires to avail itself of the services, information, advice, assistance and
facilities of an investment advisor and to have an investment advisor
perform for it various investment advisory, research services and other
management services; and

         WHEREAS, the Advisor is an investment advisor registered under the
Investment Advisers Act of 1940, as amended, and is engaged in the business
of rendering management and investment advisory services to investment
companies and desires to provide such services to the Corporation;

         NOW, THEREFORE, in consideration of the terms and conditions
hereinafter set forth, it is agreed as follows:

1.       Employment of the Advisor. The Corporation hereby employs the
Advisor to manage the investment and reinvestment of the Corporation assets,
subject to the control and direction of the Corporation's Board of
Directors, for the period and on the terms hereinafter set forth. The
Advisor hereby accepts such employment and agrees during such period to
render the services and to assume the obligations in return for the
compensation herein provided. The Advisor shall for all purposes herein be
deemed to be an independent contractor and shall, except as expressly
provided or authorized (whether herein or otherwise), have no authority to
act for or represent the Corporation in any way or otherwise be deemed an
agent of the Corporation.

2.       Obligations of and Services to be Provided by the Advisor. The
Advisor undertakes to provide the following services and to assume the
following obligations:

a.       The Advisor shall manage the investment and reinvestment of the
Corporation's assets, subject to and in accordance with the investment
objectives and policies of each Fund, and any directions which the
Corporation's Board of Directors may issue from time to time. In pursuance
of the foregoing, the Advisor shall make all determinations with respect to
the investment of the Corporation's assets and the purchase and sale of
portfolio securities and shall take such steps as may be necessary to
implement the same. Such determination and services shall also include
determining the manner in which voting rights, rights to consent to
corporate action, any other rights pertaining to the Corporation's portfolio
securities shall be exercised. The Advisor shall render regular reports to
the Corporation's Board of Directors concerning the Corporation's investment
activities.

b.       The Advisor shall, in the name of the Corporation, on behalf of
each Fund, place orders for the execution of portfolio transactions in
accordance with the policies with respect thereto set forth in the
Corporation's current registration statement under the 1940 Act and the 1933
Act. In connection with the placement of orders for the execution of
portfolio transactions the Advisor shall create and maintain all necessary
brokerage records of the Corporation in accordance with all applicable laws,
rules and regulations, including but not limited to records required by
Section 31(a) of the 1940 Act. All records shall be the property of the
Corporation and shall be available for inspection and use by the SEC, the
Corporation or any person retained by the Corporation. Where applicable,
such records shall be maintained by the Advisor for the periods and the
places required by Rule 31a-2 under the 1940 Act.

c.       The Advisor shall bear its expenses of providing services to the
Corporation pursuant to this Agreement except such expenses as are
undertaken by the Corporation. In addition, the Advisor shall pay the
salaries and fees of all Directors and executive officers who are employees
of the Advisor or its affiliates ("Advisor Employees").

3.       Expenses of each Fund. Each Fund shall pay all expenses other than
those expressly assumed by the Advisor. Expenses payable by the Fund shall
include, but are not limited to:

Fees to the Advisor as provided herein;

Legal and audit expenses;

Fees and expenses related to the registration and qualification of the
Corporation and its shares for distribution under federal and state
securities laws;

Expenses of the administrative services agent, transfer agent, registrar,
custodian, dividend disbursing agent and shareholder servicing agent;

Any telephone charges associated with shareholder servicing or the
maintenance of the Funds or Corporation;

Salaries, fees and expenses of Directors and executive officers of the
Corporation, other than Advisor Employees;

Taxes and corporate fees levied against the Corporation;

Brokerage commissions and other expenses associated with the purchase and
sale of portfolio securities for the Corporation;

Expenses, including interest, of borrowing money;

Expenses incidental to meetings of the Corporation's shareholders and the
maintenance of the Corporation's organizational existence;

Expenses of printing stock certificates representing shares of the
Corporation and expenses of preparing, printing and mailing notices, proxy
material, reports to regulatory bodies and reports to shareholders of the
Corporation;

Expenses of preparing and typesetting of prospectuses of the Corporation;

Expenses of printing and distributing prospectuses to shareholders of the
Corporation;

Association membership dues;

Insurance premiums for fidelity and other coverage;

Distribution Plan expenses, as permitted by Rule 12b-1 under the 1940 Act
and as approved by the Board; and

Such other legitimate Corporation expenses as the Board of Directors may
from time to time determine are properly chargeable to the Corporation.

4.       Compensation of Advisor.

As compensation for the services rendered and obligations assumed hereunder
by the Advisor, the Trust shall pay to the Advisor within ten (10) days
after the last day of each calendar month a fee equal on an annualized basis
as shown on Schedule A. Any amendment to the Schedule pertaining to any new
or existing Fund shall not be deemed to affect the interest of any other
Fund and shall not require the approval of the shareholders of any other
Fund.

Such fee shall be computed and accrued daily. Upon termination of this
Agreement before the end of any calendar month, the fee for such period
shall be prorated. For purposes of calculating the Advisor's fee, the daily
value of a Fund's net assets shall be computed by the same method as the
Fund uses to compute the value of its net assets in connection with the
determination of the net asset value of its shares.

The Advisor reserves the right (i) to waive all or part of its fee and
assume expenses of a Fund and (ii) to make payments to brokers and dealers
in consideration of their promotional or administrative services.

5.       Activities of the Advisor. The services of the Advisor to the
Corporation hereunder are not to be deemed exclusive, and the Advisor shall
be free to render similar services to others. It is understood that
Directors and officers of the Corporation are or may become interested in
the Advisor as stockholders, officers, or otherwise, and that stockholders
and officers of the Advisor are or may become similarly interested in the
Corporation, and that the Advisor may become interested in the Corporation
as a shareholder or otherwise.

6.       Use of Names. The Corporation shall not use the name of the Advisor
in any prospectus, sales literature or other material relating to the
Corporation in any manner not approved prior thereto by the Advisor;
provided, however, that the Advisor shall approve all uses of its name which
merely refer in accurate terms to its appointment hereunder or which are
required by the SEC; and, provided, further, that in no event shall such
approval be unreasonably withheld. The Advisor shall not use the name of the
Corporation or any Corporation in any material relating to the Advisor in
any manner not approved prior thereto by the Corporation; provided, however,
that the Corporation shall approve all uses of its name which merely refer
in accurate terms to the appointment of the Advisor hereunder or which are
required by the SEC; and, provide, further, that in no event shall such
approval be unreasonably withheld.

7.       Liability of the Advisor. Absent willful misfeasance, bad faith,
gross negligence, or reckless disregard of obligations or duties hereunder
on the part of the Advisor, the Advisor shall not be subject to liability to
the Corporation or to any shareholder of the Corporation for any act or
omission in the course of, or connected with, rendering services hereunder
or for any losses that may be sustained in the purchase, holding or sale of
any security.

8.       Force Majeure. The Advisor shall not be liable for delays or errors
occurring by reason of circumstances beyond its control, including but not
limited to acts of civil or military authority, national emergencies, work
stoppages, fire, flood, catastrophe, acts of God, insurrection, war, riot,
or failure of communication or power supply. In the event of equipment
breakdowns beyond its control, the Advisor shall take reasonable steps to
minimize service interruptions but shall have no liability with respect
thereto.

9.       Renewal, Termination and Amendment. This Agreement shall continue
in effect with respect to the Corporation, unless sooner terminated as
hereinafter provided, through December 31, 1999, and indefinitely thereafter
if its continuance shall be specifically approved at least annually by vote
of the holders of a majority of the outstanding voting securities of the
Corporation or by vote of a majority of the Corporation's Board of
Directors; and further provided that such continuance is also approved
annually by the vote of a majority of the Directors who are not parties to
this Agreement or interested persons of the Advisor, cast in person at a
meeting called for the purpose of voting on such approval, or as allowed by
law. This Agreement may be terminated at any time, without payment of any
penalty, by the Corporation's Board of Directors or by a vote of the
majority of the outstanding voting securities of the Corporation upon 60
days' prior written notice to the Advisor and by the Advisor upon 60 days'
prior written notice to the Corporation. This Agreement may be amended at
any time by the parties, subject to approval by the Corporation's Board of
Directors and, if required by applicable SEC rules and regulations, a vote
of a majority of the Corporation's outstanding voting securities. This
Agreement shall terminate automatically in the event of its assignment. The
terms "assignment" and "vote of a majority of the outstanding voting
securities" shall have the meaning set forth for such terms in the 1940 Act.

10.      Severability. If any provision of this Agreement shall be held or
made invalid by a court decision, statute, rule or otherwise, the remainder
of this Agreement shall not be affected thereby.

11.      Miscellaneous. Each party agrees to perform such further actions
and execute such further documents as are necessary to effectuate the
purposes hereof. This Agreement shall be construed and enforced in
accordance with and governed by the laws of the State of Maryland. The
captions in this Agreement are included for convenience only and in no way
define or delimit any of the provisions hereof or otherwise affect their
construction or effect.

         IN WITNESS WHEREOF, the parties have duly executed this Agreement
as of the date first written above.

         Calvert Municipal Fund, Inc.

         By: /s/ Ron Wolfsheimer    

         Title: Treasurer  

         Calvert Asset Management Company, INC.

                                    By: /s/ Reno Martini      

         Title: Senior Vice President       



Investment Advisory Agreement
Calvert Asset Management Company, Inc.
Calvert Municipal Fund, Inc.

Schedule A


As compensation pursuant to Section 4 of the Investment Advisory Agreement
between Calvert Asset management company, Inc. (the "Advisor") and Calvert
Municipal Fund, Inc. ("CMF") dated March 1, 1999, with respect to each CMF
Portfolio, the Advisor is entitled to receive from each Portfolio an annual
advisory fee (the "Fee") as shown below. The Fee shall be computed daily and
payable monthly, based on the average daily net assets of the appropriate
Portfolio.

Calvert National Municipal Intermediate Fund:        0.60% of the first $500
million
         0.50% above $500 million
         0.40% above $1 billion

Calvert California Municipal Intermediate Fund:      0.60% of the first $500
million
         0.50% above $500 million
         0.40% above $1 billion

Calvert Maryland Municipal Intermediate Fund:        0.60% of the first $500
million
         0.50% above $500 million
         0.40% above $1 billion

Calvert Virginia Municipal Intermediate Fund:        0.60% of the first $500
million
         0.50% above $500 million
         0.40% above $1 billion






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