AMERICAN CENTURY MUNICIPAL TRUST
485APOS, 1997-03-12
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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                    FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                X
                                                                     -----

         File No. 2-91229:

         Pre-Effective Amendment No.____

         Post-Effective Amendment No._19_                              X
                                                                     -----
                                     and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940        X
                                                                     -----

         File No. 811-4025:

         Amendment No._20_


         AMERICAN CENTURY MUNICIPAL TRUST
         (Exact Name of Registrant as Specified in Charter)

         4500 Main Street, P.O. Box 419200, Kansas City, MO  64141-6200
         (Address of Principal Executive Offices)

         Registrant's Telephone Number, including Area Code:  816-531-5575

         Douglas A. Paul
         Vice President and
         Associate General Counsel
         1665 Charleston Road, Mountain View, CA  94043
         (Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering:  Immediately, upon effectiveness
(first offered 8/1/84)

It is proposed that this filing become effective:

   _____ immediately upon filing pursuant to paragraph (b) of Rule 485
   _____ on (date) pursuant to paragraph (b) of Rule 485 
   _____ 60 days after filing pursuant to paragraph (a) of Rule 485 
   _____ on (date) pursuant to paragraph (a)(1) of Rule 485 
   __X__ 75 days after filing pursuant to paragraph (a) (2) of Rule 485 
   _____ on (date) pursuant to paragraph (a)(2) of Rule 485

- --------------------------------------------------------------------------------
Registrant has elected to register an indefinite number of shares of beneficial
interest under the Securities Act of 1933 pursuant to Rule 24f-2 under the
Investment Company Act of 1940. On July 17, 1996, the Registrant filed a Rule
24f-2 Notice on Form 24f-2 with respect to its fiscal year ended May 31, 1996.
<PAGE>
This Post-Effective  Amendment is being filed to add the American Century-Benham
Limited-Term Tax-Free Fund to the Trust's Registration Statement. The Prospectus
for the American Century Benham Arizona  Intermediate-Term  Municipal,  American
Century Benham Florida  Municipal Money Market,  American Century Benham Florida
Intermediate-Term  Municipal,  American  Century  Benham  Tax-Free Money Market,
American Century Benham  Intermediate-Term  Tax-Free and American Century Benham
Long-Term Tax-Free Funds is not being filed in this Post-Effective Amendment and
is incorporated herein by reference.
<PAGE>
                        AMERICAN CENTURY MUNICIPAL TRUST
                    1933 Act Post-Effective Amendment No. 19
                            1940 Act Amendment No. 20

                           AMERICAN CENTURY - BENHAM
                           LIMITED-TERM TAX-FREE FUND

                                    FORM N-1A
                              CROSS-REFERENCE SHEET

PART A:  PROSPECTUS

ITEM      PROSPECTUS CAPTION

1         Cover Page

2         Transaction and Operating Expense Table

3         Financial Highlights, Performance Advertising

4         Management, Further Information About American Century, Investment
          Objective of the Fund, Investment Policies of the Fund, Risk Factors
          and Investment Techniques, Other Investment Practices, Their
          Characteristics and Risks

5         Management

5A        Not Applicable

6         Further Information About American Century, How to Redeem Shares,
          Cover Page, Distributions, Taxes

7         Cover Page, Distribution of Fund Shares, How to Open an Account, Share
          Price, Transfer and Administrative Services

8         How to Redeem Shares, Transfer and Administrative Services

9         Not Applicable



PART B:  STATEMENT OF ADDITIONAL INFORMATION

ITEM      STATEMENT OF ADDITIONAL INFORMATION CAPTION

10        Cover Page

11        Table of Contents

12        Not Applicable

13        Investment Policies and Techniques, Investment Restrictions, Portfolio
          Transactions

14        Trustee and Officers

15        Additional Purchase and Redemption Information, Trustees and Officers

16        Investment Advisory Services, Transfer and Administrative Services,
          Expense Limitation Agreement, About the Trust

17        Portfolio Transactions

18        About the Trust

19        Additional Purchase and Redemption Information, Valuation of Portfolio
          Securities

20        Taxes

21        Additional Purchase and Redemption Information

22        Performance

23        Cover Page

<PAGE>
                                   PROSPECTUS


                             [american century logo]
                                    American
                                  Century(sm)

                              ______________, 1997

                                     BENHAM
                                    GROUP(R)

                              Limited-Term Tax-Free


                                 [front cover]


                          AMERICAN CENTURY INVESTMENTS
                                 FAMILY OF FUNDS

American Century  Investments offers you nearly 70 fund choices covering stocks,
bonds, money markets,  specialty investments and blended portfolios. To help you
find the funds that may meet your investment needs,  American Century funds have
been divided into three groups based on investment  style and objectives.  These
groups, which appear below, are designed to help simplify your fund decisions.

                          AMERICAN CENTURY INVESTMENTS

   Benham Group           American Century Group      Twentieth Century(R) Group

 MONEY MARKET FUNDS         ASSET ALLOCATION &               GROWTH FUNDS
GOVERNMENT BOND FUNDS         BALANCED FUNDS              INTERNATIONAL FUNDS
DIVERSIFIED BOND FUNDS   CONSERVATIVE EQUITY FUNDS
 MUNICIPAL BOND FUNDS        SPECIALTY FUNDS

Limited-Term Tax-Free




                                   PROSPECTUS
                            __________________, 1997

                              Limited-Term Tax-Free

                        AMERICAN CENTURY MUNICIPAL TRUST

American Century  Municipal Trust is a part of American Century  Investments,  a
family of funds that includes  nearly 70 no-load mutual funds covering a variety
of investment opportunities. One of the funds from our Benham Group that invests
in various types of municipal  securities American  Century-Benham  Limited-Term
Tax-Free  Fund (the "Fund"),  is described in this  Prospectus.  Its  investment
objective is listed on page 2 of this Prospectus.  The other funds are described
in separate prospectuses.

American Century offers investors a full line of no-load funds, investments that
have no sales charges or commissions.

This Prospectus gives you information about the Fund that you should know before
investing.  Please  read this  Prospectus  carefully  and  retain it for  future
reference.  Additional  information  is included in the  Statement of Additional
Information dated ___________,  1997, and filed with the Securities and Exchange
Commission  ("SEC").  It is incorporated  into this Prospectus by reference.  To
obtain a copy without charge, call or write:

                          American Century Investments
                       4500 Main Street o P.O. Box 419200
                Kansas City, Missouri 64141-6200 o 1-800-345-2021
                        International calls: 816-531-5575
                     Telecommunications Device for the Deaf:
                   1-800-634-4113 o In Missouri: 816-753-1865
                        Internet: www.americancentury.com

Additional   information,   including  this  Prospectus  and  the  Statement  of
Additional Information,  may be obtained by accessing the Web site maintained by
the SEC (www.sec.gov).

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





                        INVESTMENT OBJECTIVE OF THE FUND

AMERICAN CENTURY - BENHAM
LIMITED-TERM TAX-FREE FUND

Limited-Term  Tax-Free Fund seeks income  generally  exempt from regular federal
income taxes.  The Fund intends to pursue its investment  objective by investing
in tax-free bonds and maintaining a weighted  average  maturity of five years or
less.

AN  INVESTMENT  IN THE  FUND IS  NEITHER  INSURED  NOR  GUARANTEED  BY THE  U.S.
GOVERNMENT.

There is no assurance that the Fund will achieve its investment objective.

NO  PERSON  IS  AUTHORIZED  BY THE  FUND TO GIVE  ANY  INFORMATION  OR MAKE  ANY
REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS OR IN OTHER PRINTED
OR WRITTEN  MATERIAL ISSUED BY OR ON BEHALF OF THE FUND, AND YOU SHOULD NOT RELY
ON ANY OTHER INFORMATION OR REPRESENTATION.

                                TABLE OF CONTENTS

Transaction and Operating Expense Table........................................4
Financial Highlights...........................................................5

INFORMATION REGARDING THE FUND

Investment Policies of the Fund...............................................11
Portfolio Investment Quality and Maturity
     Guidelines...............................................................13
Risk Factors and Investment Techniques........................................14
     Basic Fixed Income Investment Risks......................................14
          Interest Rate Risk..................................................14
          Credit Risk.........................................................14
          Liquidity Risk......................................................14
         Concentration Risk...................................................14
          Call Risk...........................................................15
     Municipal Securities.....................................................15
     Tax-Exempt Securities....................................................16
Other Investment Practices, Their Characteristics and Risks...................17
     Portfolio Turnover.......................................................17
     When-Issued and Forward Commitment Agreement.............................17
     Interest Rate Futures Contracts and Options Thereon......................17
     Rule 144A Securities.....................................................18
     Cash Management..........................................................18
     Other Techniques.........................................................18
Performance Advertising.......................................................19

HOW TO INVEST WITH AMERICAN CENTURY INVESTMENTS

American Century Investments..................................................20
Investing in American Century.................................................20
How to Open an Account........................................................20
     By Mail..................................................................20
     By Wire..................................................................20
     By Exchange..............................................................21
     In Person................................................................21
   Subsequent Investments.....................................................21
     By Mail..................................................................21
     By Telephone.............................................................21
     By Online Access.........................................................21
     By Wire..................................................................21
     In Person................................................................21
   Automatic Investment Plan..................................................21
How to Exchange from One Account to Another...................................21
     By Mail .................................................................22
     By Telephone.............................................................22
     By Online Access.........................................................22
How to Redeem Shares..........................................................22
     By Mail..................................................................22
     By Telephone ............................................................22
     By Check-A-Month.........................................................22
     Other Automatic Redemptions..............................................22
   Redemption Proceeds........................................................22
     By Check.................................................................22
     By Wire and ACH..........................................................22
   Redemption of Shares in Low-Balance Accounts...............................23
Signature Guarantee...........................................................23
Special Shareholder Services..................................................23
     Automated Information Line...............................................23
     Online Account Access....................................................23
     Open Order Service.......................................................24
     Tax-Qualified Retirement Plans...........................................24
Important Policies Regarding Your Investments.................................24
Reports to Shareholders.......................................................25
Employer-Sponsored Retirement Plans and           
   Institutional Accounts.....................................................26

ADDITIONAL INFORMATION YOU SHOULD KNOW

Share Price...................................................................27
   When Share Price Is Determined.............................................27
   How Share Price Is Determined..............................................27
   Where to Find Information About Share Price................................28
Distributions.................................................................28
Taxes.........................................................................28
   Tax-Deferred Accounts......................................................28
   Taxable Accounts...........................................................28
   Special Tax Information....................................................29
   Municipal Securities.......................................................30
   Alternative Minimum Tax Liability..........................................30
Management....................................................................31
   Investment Management......................................................31
   Code of Ethics.............................................................31
   Transfer and Administrative Services.......................................32
Distribution of Fund Shares...................................................32
Further Information About American Century....................................32
                                                    

                     TRANSACTION AND OPERATING EXPENSE TABLE

                                                    Limited-Term Tax-Free

SHAREHOLDER TRANSACTION EXPENSES:

                  Maximum Sales Load Imposed
                     on Purchases ........................  none

                  Maximum Sales Load Imposed
                     on Reinvested Dividends .............  none

                  Deferred Sales Load ....................  none

                  Redemption Fee(1) ......................  none

                  Exchange Fee ...........................  none

ANNUAL FUND OPERATING EXPENSE:(2)
(as a percentage of net assets)

                  Management Fees(3) .....................  0.55%

                  12b-1 Fees .............................  none

                  Other Expenses(4) ......................  0.00%

                  Total Fund Operating Expenses ..........  0.55%

EXAMPLE:

You would pay the following
expenses on a $1,000 invest-                     1 year         6
ment, assuming a 5% annual                       3 years       18
return and redemption at                         5 years       31
the end of each time period:                    10 years       69


(1)  Redemption proceeds sent by wire are subject to a $10 processing fee.

(2)  The management fees, other expenses and total operating  expenses have been
     restated to reflect current expenses.

(3)  A  portion  of the  management  fee may be paid by the  Fund's  Manager  to
     unaffiliated  third parties who provide  recordkeeping  and  administrative
     services that would  otherwise be performed by an affiliate of the Manager.
     See "Management - Transfer and Administrative Services," page __.

(4)  Other  expenses,  the fees and expenses  (including  legal counsel fees) of
     those  Trustees  who  are  not  "interested  persons"  as  defined  in  the
     Investment Company Act of 1940, were 0.0014 of 1% of average net assets for
     the most recent fiscal year.



The Fund pays American  Century  Investment  Management,  Inc.  (the  "Manager")
investment  management  fees  equal to an  annualized  percentage  of the Fund's
average daily net assets.

The purpose of the above table is to help you  understand  the various costs and
expenses  that you,  as a  shareholder,  will bear  directly  or  indirectly  in
connection  with  an  investment  in the  shares  of the  Fund  offered  by this
Prospectus.  The example set forth above assumes  reinvestment  of all dividends
and  distributions  and uses a 5%  annual  rate of  return  as  required  by SEC
regulations.

NEITHER THE 5% RATE OF RETURN NOR THE EXPENSES  SHOWN ABOVE SHOULD BE CONSIDERED
INDICATIONS OF PAST OR FUTURE RETURNS AND EXPENSES.  ACTUAL RETURNS AND EXPENSES
MAY BE GREATER OR LESS THAN THOSE SHOWN.

<TABLE>
<CAPTION>



                              FINANCIAL HIGHLIGHTS
                 (For a Share Outstanding Throughout the Period)


                                                                                                                     March 1, 1993
                                                                         Years ended October 31,                 (inception) through
                                                ------------------------------------------------------------------------------------
                                                               1996                 1995                 1994      October 31, 1993
- ------------------------------------------------------------------------------------------------------------------------------------
Net Asset Value,
<S>                                                  <C>                  <C>                  <C>                  <C>           
Beginning of Period .........................        $        10.09       $         9.95       $        10.04       $        10.00
                                                        -----------          -----------          -----------          -----------

Income from
Investment Operations

  Net Investment Income .....................                   .43                  .44                  .36                  .21

  Net Realized and Unrealized
  Gains (Losses) ............................                  (.01)                 .14                 (.09)                 .04
                                                        -----------          -----------          -----------          -----------

  Total from Investment
  Operations ................................                   .42                  .58                  .27                  .25
                                                        -----------          -----------          -----------          -----------
Distributions

  From Net
  Investment Income .........................                  (.430)               (.440)               (.362)              (.214) 
                                                         -----------          -----------          -----------         -----------  

Net Asset Value,
End of Period ...............................        $        10.08       $        10.09       $         9.95       $        10.04
                                                        ===========          ===========          ===========          ===========

  Total Return1 .............................                  4.26%                5.95%                2.75%                2.55%

Ratios/Supplemental Data

  Ratio of Expenses
  to Average Net Assets .....................                .38%(2)                ---                  ---                 ---
                                                                                                                   

  Ratio of Net Investment
  Income to Average
  Net Assets ................................                  4.28%                4.38%                3.62%              3.09%(3)

  Portfolio Turnover
  Rate ......................................                    68%                  78%                  42%                   3%


  Net Assets, End of
  Period (in thousands) .....................           $    49,866          $    58,837          $    60,857          $    52,265

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

1    Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any. Total returns for periods less than one year are not
     annualized.

2    The Manager  voluntarily  waived its  management  fee through  February 29,
     1996. In absence of the waiver,  the ratio of operating expenses to average
     net assets would have been .60%.

3    Annualized.
</TABLE>


INFORMATION REGARDING THE FUND

INVESTMENT POLICIES OF THE FUND

The Fund has adopted certain  investment  restrictions that are set forth in the
Statement  of  Additional  Information.  Those  restrictions,  as  well  as  the
investment objective of the Fund identified on page 2 of this Prospectus and any
other  investment  policies  which  are  designated  as  "fundamental"  in  this
Prospectus  or in the  Statement of  Additional  Information,  cannot be changed
without shareholder  approval.  The Fund has implemented  additional  investment
policies and practices to guide its  activities in the pursuit of its investment
objective.  These policies and practices,  which are described  throughout  this
Prospectus,  are not  designated  as  fundamental  policies  and may be  changed
without shareholder approval.

For an  explanation  of the  securities  ratings  referred  to in the  following
discussion, see "Other Information" in the Statement of Additional Information.

The Fund seeks income  generally  exempt from regular federal income taxes.  The
Fund intends to pursue its  investment  objective by investing in tax-free bonds
and maintaining a weighted average maturity of five years or less.

The Fund is a "diversified  company" as defined in the Investment Company Act of
1940 (the "1940 Act"). This means that, with respect to 75% of its total assets,
the Fund will not invest more that 5% of its total assets in the securities of a
single issuer. This policy is fundamental.

The Fund intends to remain fully invested in municipal obligations, although for
temporary  defensive  purposes,  it may  invest a portion  if its assets in U.S.
government securities, the interest income on which is subject to federal income
tax. The Fund may invest up to 20% of its total assets in  securities  issued by
U.S. territories or possessions, such as Puerto Rico, provided that the interest
on these securities is exempt from the regular federal income tax.

The Fund may invest up to 20% of its total assets in municipal  obligations  for
which  the  interest  is a tax  preference  item  for  purposes  of the  federal
alternative minimum tax (the "AMT").

PORTFOLIO INVESTMENT QUALITY AND
MATURITY GUIDELINES

In terms of credit quality, the Fund restricts its investments to:

(1)  Municipal bonds rated,  when acquired,  within the four highest  categories
     designated by a nationally  recognized  statistical  rating agency ("rating
     agency");

(2)  Municipal notes (including variable-rate demand obligations) and tax-exempt
     commercial paper rated,  when acquired,  within the two highest  categories
     designated by a rating agency; and

(3)  Unrated obligations judged by the Manager, under the direction of the Board
     of Trustees, to be of comparable quality.

RISK FACTORS AND INVESTMENT TECHNIQUES

The  market  value of the  investments  of the Fund  will  change  over  time in
response  to a  number  of  factors,  which  are  summarized  in  the  following
paragraphs.

BASIC FIXED INCOME INVESTMENT RISKS
INTEREST RATE RISK

The Fund is  susceptible to changing  interest  rates.  Changing  interest rates
affect not only the level of income the Fund generates for shareholders, but its
share price as well.  In general,  when  interest  rates rise,  the Fund's share
prices declines; when interest rates decline, its share price rises.

This pattern is due to the time value of money.  A bond's worth is determined by
the  present  value of its future cash flows.  Consequently,  changing  interest
rates have a greater  effect on the  present  value of a  long-term  bond than a
short-term bond.

CREDIT RISK

In selecting  investments  for the Fund,  the Manager  carefully  considers  the
creditworthiness  of parties  and their  reliability  for the timely  payment of
interest and repayment of principal.

In many cases, these parties include not only the issuer of the obligation,  but
a bank or other  financial  intermediary  who offers a letter of credit or other
form of guarantee on the obligation.

A security's ratings reflect the opinions of the rating agencies that issue them
and are not  absolute  standards  of quality.  Because of the cost of  obtaining
credit  ratings,  some issuers forego them.  Under the direction of the Board of
Trustees, the Manager may buy unrated bonds for the Fund if these securities are
judged  to be of a  quality  consistent  with the  Fund's  investment  policies.
Similarly,  the Manager may purchase securities whose ratings are not consistent
with the  Fund's  rating  criteria  but  which  the  Manager  judges,  under the
direction of the Board of Trustees,  to present credit risks consistent with the
Fund's quality standards. The Fund may invest up to 10% of its assets in unrated
securities. Unrated securities may be less liquid than rated securities.

The Fund may invest in securities rated Baa or BBB- (the lowest investment grade
category). The Fund will limit its investment in securities rated Baa or BBB- to
25% of the Fund's total assets.  Such  securities  are  medium-grade  investment
obligations  that may have  speculative  characteristics.  Changes  in  economic
conditions or other circumstances are more likely to lead to a weakened capacity
for such obligations to make principal and interest payments.

CONCENTRATION RISK

The Fund may invest 25% or more of its total assets in obligations that generate
income from similar types of projects (in  particular,  projects in health care,
electric,  water/sewer,  education,  and transportation).  Political or economic
developments  affecting a single issuer or industry or similar types of projects
may have a significant effect on Fund performance.

CALL RISK

Many municipal  obligations are issued with a call feature  (features  include a
date on which the issuer has reserved the right to redeem the  obligation  prior
to maturity).  An  obligation  may be called for  redemption  before the Manager
would otherwise choose to eliminate it from the Fund's holdings. A call may also
reduce an obligation's yield to maturity.

MUNICIPAL SECURITIES

Municipal securities are issued to raise money for a variety of public purposes,
including general financing for state and local governments as well as financing
for specific projects and public facilities.  Municipal securities may be backed
by the full  taxing  power  of a  municipality,  the  revenues  from a  specific
project,  or the  credit of a private  organization.  The  following  discussion
provides a brief  description  of some  securities the Fund may buy. The Fund is
not limited by this  discussion,  and it may buy other types of  securities  and
enter into other  types of  transactions  that meet its  quality,  maturity  and
liquidity requirements.

MUNICIPAL  NOTES  typically have maturities of 13 months or less and are used to
provide short-term capital or to meet cash flow demands.

GENERAL OBLIGATION BONDS are backed by the taxing power of the issuer.

REVENUE  BONDS are  backed by the  revenues  derived  from a  specific  project,
system,  or facility.  Industrial  development  bonds are a type of revenue bond
backed by the credit of a private issuer.

VARIABLE- AND  FLOATING-RATE  DEMAND  OBLIGATIONS  have interest rate adjustment
formulas designed to stabilize their market values.  These obligations  normally
have maturities in excess of one year but carry demand  features  permitting the
holders to demand repayment of principal at any time or at specified intervals.

TENDER  OPTION  BONDS are created by  combining  an  intermediate-  or long-term
fixed-rate  tax-exempt  bond with a tender  agreement  that gives the holder the
option to tender the bond at face value.  Tender  option bonds  purchased by the
Fund are  structured  with  rates  that are  reset  weekly  or at other  regular
intervals.

A sponsor may terminate a tender option agreement if, for example, the issuer of
the underlying  bond defaults on interest  payments,  or the underlying  bond is
downgraded or becomes taxable. Under such circumstances, the Fund might then own
a bond that does not meet its quality or maturity criteria.

The Manager  monitors the credit  quality of bonds  underlying the Fund's tender
option  bond  holdings  and will  sell or put back a tender  option  bond if the
rating on the underlying bond falls below the  second-highest  rating designated
by a rating  agency.  In  addition,  the Fund limits its  investments  in tender
option bonds to 15% of net assets.

MUNICIPAL LEASE OBLIGATIONS are issued by state and local governments to acquire
land and a wide variety of equipment and facilities. These obligations typically
are not fully  backed by the issuing  municipality's  ability to assess taxes to
meet its debt  obligations.  If the  state  or  local  government  does not make
appropriations for the following year's lease payments, the lease may terminate,
with the possibility of default on the lease obligation and loss to investors.

Prior to purchasing a municipal lease obligation (or a participation interest in
such  obligations)  and on a regular  basis  thereafter,  pursuant to guidelines
adopted by the Board of Trustees,  the Manager  evaluates the credit quality and
liquidity of the obligation.  In making this evaluation,  the Manager  considers
various  credit  factors,  such as the  necessity of the  project;  the issuer's
credit quality, future borrowing plans, and sources of revenue pledged for lease
repayment;  general  economic  conditions  in the region  where the  security is
issued;  liquidity indictors such as dealer activity; and with regard to unrated
obligations the likelihood such lease will not be canceled.

ZERO-COUPON MUNICIPAL SECURITIES do not make regular interest payments. Instead,
they are sold at a deep  discount  to their face  value.  In  calculating  daily
dividends,  the Fund takes into account,  as income, a portion of the difference
between these securities'  purchase prices and face values.  Because zero-coupon
securities  do not pay current  income,  their prices can be very  volatile when
interest rates change.

The Fund may invest in INVERSE  FLOATERS to generate  higher  tax-exempt  yields
than are offered by other instruments. Inverse floaters bear interest rates that
move inversely to market  interest  rates.  Generally,  the interest rate on the
inverse floater is computed as the difference between an above-market fixed rate
of interest and a floating  rate  determined by reference to a  market-based  or
bond-specific interest rate.

Since inverse floaters are long-term bonds, the value of these securities may be
volatile when market interest rates change.  In addition,  there is no guarantee
that the Manager will be able to find a ready buyer for inverse floaters.

AMT BONDS typically are tax-exempt  "private activity" bonds issued after August
7, 1986,  whose proceeds are directed at least in part to a private,  for-profit
organization. Although the interest income from AMT bonds is exempt from regular
federal  income tax,  that income is a tax  preference  item for purposes of the
AMT.

In addition,  corporate  investors should note that all income from the Fund may
be part of an adjustment  to AMT under  Section 55 of the Internal  Revenue Code
and the  environmental tax under Internal Revenue Code Section 59A. The AMT is a
special  separate  tax that  applies  to  certain  taxpayers  who  have  certain
adjustments to income or tax preference items.

TAX-EXEMPT SECURITIES

Historically,  interest paid on securities issued by states,  cities,  counties,
school districts and other political  subdivisions of the United States has been
exempt from federal income taxes.  Legislation since 1985, however,  affects the
tax  treatment of certain  types of municipal  bonds issued after  certain dates
and, in some cases,  subjects  the income from certain  bonds to  differing  tax
treatment depending on the tax status of its recipient.

The Fund should be expected to invest some portion of its assets in bonds which,
in the  hands of some  holders,  would  be  subject  to the AMT,  as long as the
Manager  determines  it is in the best  interest of  shareholders  generally  to
invest in such securities. See "Taxes," page __.

The Fund may quote  tax-equivalent  yields,  which  show the  taxable  yields an
investor would have to earn before taxes to equal the Fund's  tax-free yield. As
a  prospective   investor  in  the  Fund,  you  should  determine  whether  your
tax-equivalent  yield is likely to be higher with a taxable or with a tax-exempt
fund. To determine this, you may use the formula depicted below.

You can calculate  your  tax-equivalent  yield for the Fund (taking into account
only  federal  income  taxes  and not any  applicable  state  taxes)  using  the
following equation:

                 Fund's Tax-Free Yield                    Your Tax-
     --------------------------------------------    =   Equivalent
                100% - Federal Tax Rate                     Yield


OTHER INVESTMENT PRACTICES, THEIR CHARACTERISTICS
AND RISKS

For additional  information  regarding the investment practices of the Fund, see
the Statement of Additional Information.

PORTFOLIO TURNOVER

The portfolio  turnover rates of the Fund are shown in the Financial  Highlights
table of this Prospectus.

Investment   decisions  to  purchase  and  sell  securities  are  based  on  the
anticipated  contribution of the security in question to the Fund's  objectives.
The Manager  believes that the rate of portfolio  turnover is irrelevant when it
determines a change is in order to achieve those objectives and accordingly, the
annual portfolio turnover rate cannot be anticipated.

The  portfolio  turnover of the Fund may be higher than other  mutual funds with
similar  investment  objectives.  A high turnover rate involves  correspondingly
higher transaction costs that are borne directly by the Fund. It may also affect
the character of capital  gains,  if any,  realized and  distributed by the Fund
since short-term capital gains are taxable as ordinary income.

WHEN-ISSUED AND FORWARD COMMITMENT AGREEMENTS

The Fund may  purchase  new issues of  securities  on a  when-issued  or forward
commitment  basis  when,  in the opinion of the  Manager,  such  purchases  will
further  the  investment  objective  of  the  Fund.  The  price  of  when-issued
securities is established at the time  commitment to purchase is made.  Delivery
of and payment  for these  securities  typically  occurs 15 to 45 days after the
commitment to purchase.  Market rates of interest on debt securities at the time
of delivery may be higher or lower than those  contracted  for on the  security.
Accordingly,  the value of each  security may decline  prior to delivery,  which
could result in a loss to the Fund.

INTEREST RATE FUTURES CONTRACTS AND
OPTIONS THEREON

The Fund may buy and sell  interest  rate  futures  contracts  relating  to debt
securities ("debt futures," i.e., futures relating to debt securities, and "bond
index futures," i.e.,  futures  relating to indexes on types or groups of bonds)
and  write  and buy put and call  options  relating  to  interest  rate  futures
contracts.

For options sold, the Fund will segregate cash or  high-quality  debt securities
equal to the value of  securities  underlying  the  option  unless the option is
otherwise covered.

The  Fund  will  deposit  in  a  segregated  account  with  its  custodian  bank
high-quality  debt  obligations  maturing  in one year or less,  or cash,  in an
amount equal to the  fluctuating  market value of long futures  contracts it has
purchased,  less any margin deposited on its long position.  It may hold cash or
acquire such debt obligations for the purpose of making these deposits.

The Fund may use futures  and options  transactions  to maintain  cash  reserves
while remaining fully invested,  to facilitate  trading,  to reduce  transaction
costs, or to pursue higher investment  returns when a futures contract is priced
more attractively than its underlying security or index.

Since futures contracts and options thereon can replicate  movements in the cash
markets  for the  securities  in which the Fund  invests  without the large cash
investments  required for dealing in such markets,  they may subject the Fund to
greater and more volatile risks than might  otherwise be the case. The principal
risks related to the use of such instruments are (1) the offsetting  correlation
between  movements in the market  price of the  portfolio  investments  (held or
intended) being hedged and in the price of the futures contract or option may be
imperfect;  (2)  possible  lack of a liquid  secondary  market for  closing  out
futures or option  positions;  (3) the need of additional  portfolio  management
skills  and  techniques;  and  (4)  losses  due to  unanticipated  market  price
movements.  For a hedge to be  completely  effective,  the  price  change of the
hedging instrument should equal the price change of the securities being hedged.
Such  equal  price  changes  are not  always  possible  because  the  investment
underlying the hedging  instrument may not be the same  investment that is being
hedged.

The  Manager  will  attempt  to create a closely  correlated  hedge but  hedging
activities  may  not  be  completely  successful  in  eliminating  market  value
fluctuation.  The  ordinary  spreads  between  prices  in the cash  and  futures
markets,  due to the differences in the natures of those markets, are subject to
distortion.  Due to the possibility of distortion, a correct forecast of general
interest  rate  trends  by the  Manager  may still  not  result in a  successful
transaction.  The Manager may be incorrect in its  expectations as to the extent
of various  interest rate  movements or the time span within which the movements
take place.

See the Statement of Additional  Information for further information about these
instruments and their risks.

RULE 144A SECURITIES

The Fund may, from time to time, purchase Rule 144A securities when they present
attractive investment  opportunities that otherwise meet the Fund's criteria for
selection.  Rule 144A securities are securities  that are privately  placed with
and traded  among  qualified  institutional  investors  rather  than the general
public.  Although Rule 144A securities are considered  "restricted  securities,"
they are not necessarily illiquid.

With respect to securities eligible for resale under Rule 144A, the staff of the
SEC has  taken  the  position  that  the  liquidity  of such  securities  in the
portfolio of a fund offering redeemable securities is a question of fact for the
Board  of  Trustees  to  determine,  such  determination  to  be  based  upon  a
consideration  of the readily  available  trading  markets and the review of any
contractual restrictions.  Accordingly, the Board of Trustees is responsible for
developing and  establishing  the guidelines and procedures for  determining the
liquidity  of Rule  144A  securities.  As  allowed  by Rule  144A,  the Board of
Trustees of the Fund has delegated the day-to-day  function of  determining  the
liquidity  of Rule  144A  securities  to the  Manager.  The  Board  retains  the
responsibility to monitor the implementation of the guidelines and procedures it
has adopted.

Since the secondary  market for such securities is limited to certain  qualified
institutional  investors,  the  liquidity  of  such  securities  may be  limited
accordingly  and the Fund may, from time to time, hold a Rule 144A security that
is illiquid. In such an event, the Manager will consider appropriate remedies to
minimize the effect on the Fund's  liquidity.  The Fund may not invest more than
10% of its total assets in illiquid securities  (securities that may not be sold
within seven days at  approximately  the price used in determining the net asset
value of Fund shares).

CASH MANAGEMENT

For cash management purposes, the Fund may invest up to an aggregate total of 5%
of its total assets in other investment companies,  provided that the investment
is consistent with the Fund's investment policies and restrictions.

OTHER TECHNIQUES

The  Manager  may buy  other  types of  securities  or  employ  other  portfolio
management  techniques on behalf of the Fund. When SEC guidelines  require it to
do so, the Fund will set aside cash or appropriate liquid assets in a segregated
account  to cover  its  obligations.  See the  Fund's  Statement  of  Additional
Information for a more detailed  discussion of these investments and some of the
risks associated with them.

PERFORMANCE ADVERTISING

From time to time, the Fund may advertise performance data. Fund performance may
be  shown  by  presenting  one  or  more  performance  measurements,   including
cumulative total return or average annual total return,  yield,  effective yield
and tax-equivalent yield (for tax-exempt funds).

Cumulative  total return data is computed by considering all elements of return,
including  reinvestment  of dividends  and capital gains  distributions,  over a
stated  period of time.  Average  annual total return is determined by computing
the annual compound return over a stated period of time that would have produced
the  Fund's  cumulative  total  return  over  the  same  period  if  the  Fund's
performance had remained constant throughout.

A quotation of yield  reflects the Fund's income over a stated period  expressed
as a percentage of the Fund's share price.  Yield is calculated by adding over a
30-day (or  one-month)  period all  interest  and  dividend  income (net of fund
expenses)  calculated  on each day's  market  values,  dividing  this sum by the
average number of Fund shares  outstanding during the period, and expressing the
result as a  percentage  of the Fund's share price on the last day of the 30-day
(or one month)  period.  The  percentage is then  annualized.  Capital gains and
losses are not included in the calculation.

Yields are calculated  according to accounting  methods that are standardized in
accordance  with SEC rules.  The SEC yield  should be regarded as an estimate of
the Fund's rate of  investment  income,  and it may not equal the Fund's  actual
income  distribution  rate, the income paid to a shareholder's  account,  or the
income reported in the Fund's financial statements.

A  tax-equivalent  yield  demonstrates  the taxable  yield  necessary to produce
after-tax  yield  equivalent  to that of a mutual  fund which  invests in exempt
obligations.  See  "Tax-Exempt  Securities,"  page __, for a description  of the
formulas used in comparing yields to tax-equivalent yields.

The Fund may also include in advertisements data comparing  performance with the
performance of non-related  investment media,  published  editorial comments and
performance  rankings  compiled  by  independent  organizations  (such as Lipper
Analytical  Services or  Donoghue's  Money Fund  Report) and  publications  that
monitor the performance of mutual funds.  Performance  information may be quoted
numerically  or may be presented  in a table,  graph or other  illustration.  In
addition,  Fund  performance  may be  compared to  well-known  indices of market
performance.  Fund  performance  may also be compared,  on a relative  basis, to
other funds in our fund family.  This  relative  comparison,  which may be based
upon  historical  or  expected  Fund  performance,   volatility  or  other  Fund
characteristics,  may be presented  numerically,  graphically  or in text.  Fund
performance may also be combined or blended with other funds in our fund family,
and that combined or blended  performance may be compared to the same indices to
which individual funds may be compared.

All performance  information  advertised by the Fund is historical in nature and
is not  intended to represent or  guarantee  future  results.  The value of Fund
shares when redeemed may be more or less than their original cost.


                               HOW TO INVEST WITH
                          AMERICAN CENTURY INVESTMENTS

AMERICAN CENTURY INVESTMENTS

The  Fund  offered  by  this  Prospectus  is a  part  of  the  American  Century
Investments  family  of  mutual  funds.  Our  family  provides  a full  range of
investment  opportunities,  from  the  aggressive  equity  growth  funds  in our
Twentieth  Century Group,  to the fixed income funds in our Benham Group, to the
moderate risk and specialty  funds in our American  Century  Group.  Please call
1-800-345-2021  for a  brochure  or  prospectuses  for the  other  funds  in the
American Century Investments family.

INVESTING IN AMERICAN CENTURY

The  following  section  explains  how to  invest  in  American  Century  funds,
including purchases, redemptions,  exchanges and special services. You will find
more detail about doing  business with us by referring to the Investor  Services
Guide that you will receive when you open an account.

If  you   own  or  are   considering   purchasing   Fund   shares   through   an
employer-sponsored  retirement  plan or through a bank,  broker-dealer  or other
financial  intermediary,  the  following  sections,  as well as the  information
contained  in our Investor  Services  Guide,  may not apply to you.  Please read
"Employer-Sponsored Retirement Plans and Institutional Accounts," page __.

HOW TO OPEN AN ACCOUNT

To open an account,  you must complete and sign an application,  furnishing your
taxpayer  identification  number. (You must also certify whether you are subject
to withholding  for failing to report income to the IRS.)  Investments  received
without a certified taxpayer identification number will be returned.

The minimum investment is $5,000.

The  minimum  investment  requirements  may  be  different  for  some  types  of
retirement  accounts.  Call one of our  Investor  Services  Representatives  for
information  on  out  retirement  plans,  which  are  available  for  individual
investors or for those investing through their employers.

Please note: If you register your account as belonging to multiple owners (e.g.,
as joint  tenants),  you must  provide us with  specific  authorization  on your
application in order for us to accept written or telephone  instructions  from a
single owner. Otherwise,  all owners will have to agree to any transactions that
involve the account  (whether the transaction  request is in writing or over the
telephone).

You may invest in the following ways:

BY MAIL

Send a completed application and check or money order payable in U.S. dollars to
American Century Investments.

BY WIRE

You may make your initial  investment by wiring funds. To do so, call us or mail
a completed application and provide your bank with the following information:

o  RECEIVING BANK AND ROUTING NUMBER:
   Commerce Bank, N.A. (101000019)

o  BENEFICIARY (BNF):
   American Century Services Corporation
   4500 Main St., Kansas City, Missouri 64111

o  BENEFICIARY ACCOUNT NUMBER (BNF ACCT):
   2804918

o  REFERENCE FOR BENEFICIARY (RFB):
   American  Century  account number into which you are investing.  If more than
   one, leave blank and see Bank to Bank Information below.

o  ORIGINATOR TO BENEFICIARY (OBI):
   Name and address of owner of account into which you are investing.

o  BANK TO BANK INFORMATION
   (BBI OR FREE FORM TEXT):

   o Taxpayer identification or Social Security number

   o If more than one account, account numbers and amount to be invested in each
     account.

   o Current tax year, previous tax year or rollover designation if an IRA.
     Specify whether IRA, SEP-IRA or SARSEP-IRA.

BY EXCHANGE

Call  1-800-345-2021  from 7 a.m. to 7 p.m.  Central time to get  information on
opening an account by exchanging from another American Century account. See page
___ for more information on exchanges.

IN PERSON

If you prefer to work with a representative  in person,  please visit one of our
Investors Centers, located at:

4500 Main Street
Kansas City, Missouri 64111

1665 Charleston Road
Mountain View, California 94043

2000 S. Colorado Blvd.
Denver, Colorado 80222

SUBSEQUENT INVESTMENTS

Subsequent  investments may be made by an automatic bank,  payroll or government
direct  deposit (see  "Automatic  Investment  Plan," this page) or by any of the
methods below. The minimum  investment  requirement for subsequent  investments:
$250 for checks submitted without the remittance portion of a previous statement
or confirmation, $50 for all other types of subsequent investments.

BY MAIL

When  making  subsequent  investments,  enclose  your check with the  remittance
portion of the confirmation of a previous investment.  If the investment slip is
not available, indicate your name, address and account number on your check or a
separate  piece of paper.  (Please  be aware  that the  investment  minimum  for
subsequent investments is higher without an investment slip.)

BY TELEPHONE

Once your  account is open,  you may make  investments  by telephone if you have
authorized us (by choosing "Full Services" on your  application) to draw on your
bank  account.  You may  call an  Investor  Services  Representative  or use our
Automated Information Line.

BY ONLINE ACCESS

Once  your  account  is  open,  you may  make  investments  online  if you  have
authorized us (by choosing "Full Services" on your  application) to draw on your
bank account.

BY WIRE

You  may  make  subsequent   investments  by  wire.  Follow  the  wire  transfer
instructions on page __ and indicate your account number.

IN PERSON

You may make subsequent  investments in person at one of our Investors  Centers.
The locations of our three Investors Centers are listed on page ___.

AUTOMATIC INVESTMENT PLAN

You  may  elect  on  your  application  to  make  investments  automatically  by
authorizing us to draw on your bank account regularly.  Such investments must be
at least the  equivalent  of $50 per  month.  You also may  choose an  automatic
payroll or government  direct  deposit.  If you are  establishing a new account,
check the appropriate box under  "Automatic  Investments" on your application to
receive  more  information.  If you  would  like to add a direct  deposit  to an
existing account, please call one of our Investor Services Representatives.

HOW TO EXCHANGE FROM ONE ACCOUNT TO ANOTHER

As long as you meet any minimum investment  requirements,  you may exchange your
Fund shares to our other funds up to six times per year per account. An exchange
request will be processed  the same day it is received if it is received  before
the funds' net asset values are calculated, which is one hour prior to the close
of the New York Stock Exchange for American Century Target Maturities Trust, and
at the close of the Exchange  for all of our other funds.  See "When Share Price
is Determined," page __.

For any single  exchange,  the shares of each fund  being  acquired  must have a
value of at least $100.  However, we will allow investors to set up an Automatic
Exchange Plan between any two funds in the amount of at least $50 per month. See
our Investor Services Guide for further information about exchanges.

BY MAIL

You may direct us in writing to exchange  your shares from one American  Century
account to another. For additional information, please see our Investor Services
Guide.

BY TELEPHONE

You can make  exchanges  over the  telephone  (either with an Investor  Services
Representative or using our Automated Information Line--see page __) if you have
authorized  us to  accept  telephone  instructions.  You can  authorize  this by
selecting "Full Services" on your application or by calling us at 1-800-345-2021
to get the appropriate form.

BY ONLINE ACCESS

You can make exchanges  online if you have authorized us to accept  instructions
over the Internet.  You can authorize this by selecting  "Full Services" on your
application or by calling us at 1-800-345-2021 to get the appropriate form.

HOW TO REDEEM SHARES

We will redeem or "buy back" your shares at any time.  Redemptions  will be made
at the next net asset value  determined after a complete  redemption  request is
received.

Please  note that a request  to redeem  shares in an IRA or 403(b)  plan must be
accompanied  by an  executed  IRS  Form  W4-P  and a reason  for  withdrawal  as
specified by the IRS.

BY MAIL

Your written  instructions  to redeem  shares may be made either by a redemption
form,  which we will send to you upon  request,  or by a letter  to us.  Certain
redemptions may require a signature guarantee. Please see "Signature Guarantee,"
page __.

BY TELEPHONE

If you have authorized us to accept telephone instructions,  you may redeem your
shares by calling an Investor Services Representative.

BY CHECK-A-MONTH

If you have at least a $10,000 balance in your account, you may redeem shares by
Check-A-Month.  A Check-A-Month  plan  automatically  redeems enough shares each
month to provide you a check in an amount you choose  (minimum $50). To set up a
Check-A-Month plan, please call and request our Check-A-Month brochure.

OTHER AUTOMATIC REDEMPTIONS

If you have at least  $10,000  balance  in your  account,  you may elect to make
redemptions  automatically  by  authorizing  us to send  funds to you or to your
account  at  a  bank  or  other  financial  institution.  To  set  up  automatic
redemptions, call one of our Investor Services Representatives.

REDEMPTION PROCEEDS

Please  note  that  shortly  after a  purchase  of  shares  is made by  check or
electronic  draft (also known as an ACH draft) from your bank, we may wait up to
15 days or longer to send  redemption  proceeds (to allow your purchase funds to
clear).  No interest is paid on the redemption  proceeds after the redemption is
processed but before your redemption proceeds are sent.

Redemption proceeds may be sent to you in one of the following ways:

BY CHECK

Ordinarily,  all redemption  checks will be made payable to the registered owner
of the  shares  and will be  mailed  only to the  address  of  record.  For more
information, please refer to our Investor Services Guide.

BY WIRE AND ACH

You may  authorize  us to transmit  redemption  proceeds  by wire or ACH.  These
services will be effective 15 days after we receive the authorization.

Your bank will  usually  receive  wired funds  within 48 hours of  transmission.
Funds  transferred  by ACH may be received up to seven days after  transmission.
Wired  funds  are  subject  to a $10 fee to cover  bank wire  charges,  which is
deducted from redemption proceeds.  Once the funds are transmitted,  the time of
receipt and the funds' availability are not under our control.

REDEMPTION OF SHARES IN LOW-BALANCE ACCOUNTS

Whenever  the shares held in an account  have a value of less than the  required
minimum,  a letter will be sent advising you of the necessity to bring the value
of the  shares  held in the  account up to the  minimum.  If action is not taken
within 90 days of the  letter's  date,  the shares held in the  account  will be
redeemed and proceeds from the redemption  will be sent by check to your address
of record. We reserve the right to increase the investment minimums.

SIGNATURE GUARANTEE

To protect your accounts from fraud,  some transactions will require a signature
guarantee.  Which transactions will require a signature guarantee will depend on
which service options you elect when you open your account.  For example, if you
choose "In Writing Only," a signature guarantee will be required when:

o    redeeming more than $25,000; or

o    establishing  or  increasing a  Check-A-Month  or automatic  transfer on an
     existing account.

You can obtain a signature guarantee from a bank or trust company, credit union,
broker-dealer,  securities  exchange or association,  clearing agency or savings
association, as defined by federal law.

For a more in-depth  explanation of our signature  guarantee  policy,  or if you
live outside the United  States and would like to know how to obtain a signature
guarantee, please consult our Investor Services Guide.

We reserve the right to require a signature guarantee on any transaction,  or to
change this policy at any time.

SPECIAL SHAREHOLDER SERVICES

We offer several  service  options to make your account easier to manage.  These
are listed on the account  application.  Please  make note of these  options and
elect the ones that are  appropriate  for you. Be aware that the "Full Services"
option offers you the most  flexibility.  You will find more  information  about
each of these service options in our Investor Services Guide.

Our special shareholder services include:

AUTOMATED INFORMATION LINE

We offer an Automated  Information  Line, 24 hours a day,  seven days a week, at
1-800-345-8765.  By calling the Automated  Information  Line,  you may listen to
fund prices,  yields and total return  figures.  You may also use the  Automated
Information  Line to make  investments  into your accounts (if we have your bank
information  on file) and  obtain  your  share  balance,  value and most  recent
transactions.  If you have authorized us to accept telephone  instructions,  you
also may exchange shares from one fund to another via the Automated  Information
Line.  Redemption  instructions  cannot be given via the  Automated  Information
Line.

ONLINE ACCOUNT ACCESS

You may contact us 24 hours a day, seven days a week at  www.americancentury.com
to access  your fund's  daily  share  prices,  receive  updates on major  market
indexes  and view  historical  performance  of your funds.  If you select  "Full
Services" on your application,  you can use your personal access code and Social
Security  number  to view your  account  balances  and  account  activity,  make
subsequent  investments  from your bank account or exchange shares from one fund
to another.

OPEN ORDER SERVICE

Through our open order service, you may designate a price at which to buy shares
of a  variable-priced  fund by exchange from one of our money market funds, or a
price at which to sell  shares of a  variable-priced  fund by exchange to one of
our money market funds. The designated purchase price must be equal to or lower,
or the designated sale price equal to or higher, than the variable-priced fund's
net asset value at the time the order is placed,  If the designated price is met
within 90 calendar  days, we will execute your exchange order  automatically  at
that  price  (or  better).  Open  orders  not  executed  within  90 days will be
canceled.

If the fund you have selected deducts a distribution  from its share price, your
order  price  will  be  adjusted   accordingly  so  the  distribution  does  not
inadvertently  trigger an open order transaction on your behalf. If you close or
re-register  the  account  from which the shares are to be  redeemed,  your open
order will be canceled.

Because of their  time-sensitive  nature,  open order  transactions are accepted
only by  telephone  or in person.  These  transactions  are  subject to exchange
limitations  described  in  each  fund's  prospectus,  except  that  orders  and
cancellations  received  before 2 p.m.  Central time are effective the same day,
and orders or cancellations received after 2 p.m. Central time are effective the
next business day.

TAX-QUALIFIED RETIREMENT PLANS

The Fund is available for your  tax-deferred  retirement  plan. Call or write us
and request the appropriate forms for:

o    Individual Retirement Accounts ("IRAs")

o    403(b)  plans  for  employees  of  public  school  systems  and  non-profit
     organizations; or

o    Profit  sharing  plans  and  pension  plans  for   corporations  and  other
     employers.

If your IRA and 403(b) accounts do not total $10,000, each account is subject to
an annual $10 fee, up to a total of $30 per year.

You can also  transfer  your  tax-deferred  plan to us from  another  company or
custodian. Call or write us for a Request to Transfer form.

IMPORTANT POLICIES REGARDING YOUR INVESTMENTS

Every account is subject to policies that could affect your  investment.  Please
refer to the Investor Services Guide for further  information about the policies
discussed below, as well as further detail about the services we offer.

(1)  We reserve the right for any reason to suspend the offering of shares for a
     period  of time,  or to  reject  any  specific  purchase  order  (including
     purchases by exchange).  Additionally,  purchases may be refused if, in the
     opinion  of the  Manager,  they  are  of a  size  that  would  disrupt  the
     management of the Fund.

(2)  We reserve the right to make changes to any stated investment requirements,
     including  those that relate to purchases,  transfers and  redemptions.  In
     addition,  we may also alter, add to or terminate any investor services and
     privileges.  Any changes may affect all shareholders or only certain series
     or classes of shareholders.

(3)  Shares  being  acquired  must  be  qualified  for  sale in  your  state  of
     residence.

(4)  Transactions  requesting a specific price and date, other than open orders,
     will be  refused.  Once you  have  mailed  or  otherwise  transmitted  your
     transaction instructions to us, they may not be modified or canceled.

(5)  If a  transaction  request is made by a  corporation,  partnership,  trust,
     fiduciary,  agent or unincorporated  association,  we will require evidence
     satisfactory to us of the authority of the individual making the request.

(6)  We have  established  procedures  designed  to assure the  authenticity  of
     instructions  received by telephone.  These procedures  include  requesting
     personal  identification  from  callers,  recording  telephone  calls,  and
     providing written confirmations of telephone transactions. These procedures
     are  designed  to protect  shareholders  from  unauthorized  or  fraudulent
     instructions.  If we do not employ  reasonable  procedures  to confirm  the
     genuineness  of  instructions,  then we may be  liable  for  losses  due to
     unauthorized or fraudulent  instructions.  The company,  its transfer agent
     and  investment  advisor  will  not be  responsible  for  any  loss  due to
     instructions they reasonably believe are genuine.

(7)  All signatures  should be exactly as the name appears in the  registration.
     If the owner's name appears in the  registration  as Mary Elizabeth  Jones,
     she should sign that way and not as Mary E. Jones.

(8)  Unusual stock market conditions have in the past resulted in an increase in
     the number of shareholder  telephone calls. If you experience difficulty in
     reaching us during such periods, you may send your transaction instructions
     by mail,  express  mail or  courier  service,  or you may  visit one of our
     Investors Centers.  You may also use our Automated  Information Line if you
     have requested and received an access code and are not attempting to redeem
     shares.

(9)  If  you  fail  to  provide   us  with  the   correct   certified   taxpayer
     identification  number,  we may reduce any  redemption  proceeds  by $50 to
     cover the  penalty  the IRS will  impose on us for  failure to report  your
     correct taxpayer identification number on information reports.

(10) We will perform special inquiries on shareholder  accounts.  A research fee
     of $15 per hour may be applied.

REPORTS TO SHAREHOLDERS

At the end of each calendar quarter,  we will send you a consolidated  statement
that summarizes all of your American Century holdings,  as well as an individual
statement for each fund you own that reflects all year-to-date  activity in your
account. You may request a statement of your account activity at any time.

With the exception of most automatic transactions, each time you invest, redeem,
transfer  or  exchange   shares,   we  will  send  you  a  confirmation  of  the
transactions. See the Investor Services Guide for more detail.

Carefully review all the information relating to transactions on your statements
and  confirmations  to ensure  that your  instructions  were acted on  properly.
Please  notify us  immediately  in writing if there is an error.  If you fail to
provide  notification of an error with reasonable  promptness,  i.e.,  within 30
days of  non-automatic  transactions  or  within  30  days  of the  date of your
consolidated quarterly statement, in the case of automatic transactions, we will
deem you to have ratified the transaction.

No later than January  31st of each year,  we will send you reports that you may
use in completing your U.S. income tax return.  See the Investor  Services Guide
for more information.

Each year, we will send you an annual and a semiannual  report  relating to your
fund,  each of which is  incorporated  herein by  reference.  The annual  report
includes audited financial  statements and a list of portfolio  securities as of
the  fiscal  year  end.  The  semiannual  report  includes  unaudited  financial
statements  for the first six  months of the fiscal  year,  as well as a list of
portfolio  securities at the end of the period. You also will receive an updated
prospectus at least once each year.  Please read these materials  carefully,  as
they will help you understand your fund.

EMPLOYER-SPONSORED RETIREMENT PLANS AND
INSTITUTIONAL ACCOUNTS

Information  contained in our Investor  Services Guide pertains to  shareholders
who  invest   directly   with   American   Century   rather   than   through  an
employer-sponsored retirement plan or through a financial intermediary.

If  you   own  or  are   considering   purchasing   Fund   shares   through   an
employer-sponsored retirement plan, your ability to purchase shares of the Fund,
exchange them for shares of other American  Century funds,  and redeem them will
depend on the terms of your plan.

If  you  own  or  are  considering   purchasing  Fund  shares  through  a  bank,
broker-dealer,  insurance company or other financial intermediary,  your ability
to purchase,  exchange and redeem shares will depend on your agreement with, and
the policies of, such financial intermediary.

You may  reach  one of our  Institutional  Service  Representatives  by  calling
1-800-345-3533 to request information about our funds and services,  to obtain a
current  prospectus  or to get  answers  to any  questions  about  our funds and
services  that you are  unable to obtain  through  your  plan  administrator  or
financial intermediary.

                     ADDITIONAL INFORMATION YOU SHOULD KNOW

SHARE PRICE

WHEN SHARE PRICE IS DETERMINED

The price of your shares is also referred to as their net asset value. Net asset
value is determined by calculating the total value of a Fund's assets, deducting
total  liabilities and dividing the result by the number of shares  outstanding.
For all American Century funds, except American Century Target Maturities Trust,
net asset value is determined  at the close of regular  trading on each day that
the New York Stock  Exchange is open,  usually 3 p.m.  Central  time.  Net asset
value for the Target Maturities is determined one hour prior to the close of the
Exchange.

Investments  and  requests to redeem or exchange  shares will  receive the share
price next  determined  after  receipt by us of the  investment,  redemption  or
exchange  request.  For example,  investments and requests to redeem or exchange
shares of a fund  received by us or one of our agents before the net asset value
of the fund is  determined,  are  effective  on,  and  will  receive  the  price
determined,  that day.  Investment,  redemption and exchange  requests  received
thereafter  are effective on, and receive the price  determined on, the next day
the Exchange is open.

Investments  are considered  received only when payment is received by us. Wired
funds are considered  received on the day they are deposited in our bank account
if they are deposited before the net asset value is determined.

Investments by telephone  pursuant to your prior  authorization to us to draw on
your bank account are considered received at the time of your telephone call.

Investment and  transaction  instructions  received by us on any business day by
mail before the net asset value is  determined  will  receive  that day's price.
Investments  and  instructions  received  after that time will receive the price
determined on the next business day.

If you invest in Fund shares through an  employer-sponsored  retirement  plan or
other financial intermediary, it is the responsibility of your plan recordkeeper
or financial  intermediary  to transmit your  purchase,  exchange and redemption
requests to the Fund's  transfer agent prior to the applicable  cut-off time for
receiving orders and to make payment for any purchase transactions in accordance
with the Fund's procedures or any contractual  arrangements with the Fund or the
Fund's distributor in order for you to receive that day's price.

HOW SHARE PRICE IS DETERMINED

The  valuation of assets for  determining  net asset value may be  summarized as
follows:

The  portfolio  securities  of the Fund,  except as otherwise  noted,  listed or
traded on a domestic  securities  exchange  are valued at the last sale price on
that  exchange.  Portfolio  securities  primarily  traded on foreign  securities
exchanges  are  generally  valued  at  the  preceding  closing  values  of  such
securities on the exchange where primarily traded. If no sale is reported, or if
local convention or regulation so provides, the mean of the latest bid and asked
prices is used.  Depending on local convention or regulation,  securities traded
over-the-counter  are priced at the mean of the latest bid and asked prices,  or
at the last sale  price.  When  market  quotations  are not  readily  available,
securities and other assets are valued at fair value as determined in accordance
with procedures adopted by the Board of Trustees.

Debt securities not traded on a principal securities exchange are valued through
valuations obtained from a commercial pricing service or at the most recent mean
of the bid and asked prices  provided by investment  dealers in accordance  with
procedures established by the Board of Trustees.

WHERE TO FIND INFORMATION ABOUT SHARE PRICE

The net asset value of the Fund is published in leading  newspapers  daily.  The
net asset values,  as well as yield information on the Fund and all of the other
funds in the American  Century family of funds,  may also be obtained by calling
us or by accessing our Web site at www.americancentury.com.

DISTRIBUTIONS

At the close of each day, including Saturdays,  Sundays and holidays, net income
plus net realized  gains on portfolio  securities of the Fund is determined  and
declared as a distribution.  The  distribution  will be paid monthly on the last
Friday of each month,  except for year-end  distributions  which will be made on
the last business day of the year.

You will begin to participate in the  distributions  the day after your purchase
is  effective.  See "When  Share Price is  Determined,"  page __.) If you redeem
shares,  you  will  receive  the  distribution  declared  for  the  day  of  the
redemption.  If all shares are redeemed, the distribution on the redeemed shares
will be included with your redemption proceeds.

Distributions  from net realized  capital gains, if any,  generally are declared
and paid once a year,  but the Fund may make  distributions  on a more  frequent
basis to comply with the distribution requirements of the Internal Revenue Code,
in all events in a manner consistent with the provisions of the 1940 Act.

Participants in employer-sponsored retirement or savings plans must reinvest all
distributions.    For   shareholders   investing   through   taxable   accounts,
distributions  will be  reinvested  unless  you elect to  receive  them in cash.
Distributions of less than $10 generally will be reinvested.  Distributions made
shortly  after a  purchase  by check  or ACH may be held up to 15 days.  You may
elect to have distributions on shares held in Individual Retirement Accounts and
403(b)  plans  paid  in  cash  only  if you  are at  least  591/2  years  old or
permanently and totally disabled. Distribution checks normally are mailed within
seven days after the record date. Please consult our Investor Services Guide for
further information regarding your distribution options.

A distribution  of shares of the Fund does not increase the value of your shares
of your total  return.  At any given time the value of your shares  includes the
undistributed  net gains, if any,  realized by the Fund on the sale of portfolio
securities,  and  undistributed  dividends  and  interest  received,  less  fund
expenses.

Because such gains and dividends are included in the value of your shares,  when
they are  distributed  the value of your  shares is reduced by the amount of the
distribution.  If you buy your shares through a taxable  account just before the
distribution,  you will pay the full price for your  shares,  and then receive a
portion of the purchase price back as a taxable distribution.

TAXES

The Fund has  elected to be taxed under  Subchapter  M of the  Internal  Revenue
Code,  which means that to the extent its income is distributed to shareholders,
it pays no income tax.

TAX-DEFERRED ACCOUNTS

If Fund shares are purchased through tax-deferred accounts,  such as a qualified
employer-sponsored   retirement  or  savings  plan,  income  and  capital  gains
distributions  paid  by the  Fund  will  generally  not be  subject  to  current
taxation,  but will  accumulate in your account under the plan on a tax-deferred
basis.

Employer-sponsored  retirement  and  savings  plans are  governed by complex tax
rules.  If you elect to participate in your employer's  plan,  consult your plan
administrator,  your plan's  summary plan  description,  or a  professional  tax
advisor   regarding  the  tax   consequences  of   participation  in  the  plan,
contributions to, and withdrawals or distributions from the plan.

TAXABLE ACCOUNTS

If Fund shares are purchased  through  taxable  accounts,  distributions  of net
investment  income  and net  short-term  capital  gains  are  taxable  to you as
ordinary income, except as described below. The dividends from net income of the
Fund do not qualify for the 70%  dividends-received  deduction for  corporations
since they are derived  from  interest  income.  Dividends  representing  income
derived from tax-exempt bonds generally retain the bonds'  tax-exempt  character
in a shareholder's  hands.  Distributions  from net long-term  capital gains are
taxable as long-term  capital  gains  regardless  of the length of time you have
held the shares on which such distributions are paid.  However,  you should note
that any loss realized upon the sale or redemption of shares held for six months
or less  will be  treated  as a  long-term  capital  loss to the  extent  of any
distribution of long-term capital gain to you with respect to such shares.

Distributions are taxable to you regardless of whether they are taken in cash or
reinvested, even if the value of your shares is below your cost. If you purchase
shares  shortly  before  a  distribution,  you  must  pay  income  taxes  on the
distribution,  even though the value of your investment (plus cash received,  if
any) will not have  increased.  In  addition,  the  share  price at the time you
purchase  shares may  include  unrealized  gains in the  securities  held in the
investment portfolio of the Fund. If these portfolio securities are subsequently
sold and the gains are realized,  they will, to the extent not offset by capital
losses, be paid to you as a distribution of capital gains and will be taxable to
you as short-term or long-term capital gains.

In January  of the year  following  the  distribution,  you will  receive a Form
1099-DIV  notifying you of the status of your  distributions  for federal income
tax purposes. The Fund anticipates that substantially all of the dividends to be
paid by the Fund will be  exempt  from  federal  income  taxes to an  individual
unless, due to that person's own tax situation, he or she is subject to the AMT.
In that case,  it is likely that a portion of the  dividends  will be taxable to
that  shareholder  while  remaining  tax-exempt  in  the  hands  of  most  other
shareholders.  The Fund will advise  shareholders of the percentage,  if any, of
the dividends not exempt from federal  income tax, and the  percentage,  if any,
subject to the individual AMT should a shareholder be subject to it.

Distributions  may also be  subject to state and local  taxes,  even if all or a
substantial  part  of  such  distribution  are  derived  from  interest  on U.S.
government  obligations  which,  if you received them directly,  would be exempt
from state income tax. However, most but not all states allow this tax exemption
to pass through to Fund  shareholders  when the Fund pays  distributions  to its
shareholders.  You should  consult your tax advisor about the tax status of such
distributions in your own state.

If you have not complied with certain  provisions of the Internal  Revenue Code,
we are  required  by  federal  law to  withhold  and  remit  to the  IRS  31% of
reportable  payments (which may include dividends,  capital gains  distributions
and  redemptions).  Those  regulations  require  you to certify  that the Social
Security number or tax identification number you provide is correct and that you
are not subject to 31% withholding for previous  under-reporting to the IRS. You
will be  asked  to  make  the  appropriate  certification  on your  application.
Payments   reported  by  us  that  omit  your  Social  Security  number  or  tax
identification number will subject us to a penalty of $50, which will be charged
against  your account if you fail to provide the  certification  by the time the
report is filed, and is not refundable.

Redemption  of shares of the Fund  (including  redemptions  made in an  exchange
transaction)  will be a taxable  transaction for federal income tax purposes and
shareholders  will generally  recognize a gain or loss in an amount equal to the
difference  between  the basis of the shares and the amount  received.  Assuming
that  shareholders hold such shares as a capital asset, the gain or loss will be
a capital gain or loss and will generally be long term if shareholders have held
such  shares for a period of more than one year.  If a loss is  realized  on the
redemption of Fund shares,  the reinvestment in additional Fund shares within 30
days before or after the  redemption  may be subject to the "wash sale" rules of
the Internal  Revenue Code,  resulting in a postponement  of the  recognition of
such loss for federal income tax purposes.

SPECIAL TAX INFORMATION

The Fund  intends  to invest a  sufficient  portion  of its  assets in state and
municipal obligations so that it will qualify to pay "exempt-interest dividends"
to shareholders.  Such exempt-interest dividends are generally excludable from a
shareholder's  gross  income  for  federal  tax  purposes.  If the  Fund  earned
federally  taxable  income  from any of its  investments,  the  income  would be
distributed to shareholders as a taxable dividend as described above.

MUNICIPAL SECURITIES

Opinions relating to the validity of municipal  securities and the exemptions of
interest  thereon  from  federal  income tax are rendered by bond counsel to the
issuers. The Fund and the Manager rely on the opinion of bond counsel and do not
undertake any independent  investigation of proceedings relating to the issuance
of state or  municipal  securities.  The Fund may invest in various  instruments
that are not  traditional  state and local  obligations and that are believed to
generate  interest  excludable  from  taxable  income  under Code  Section  103,
including, but not limited to, municipal lease obligations and inverse floaters.
Although the Fund may invest in these  instruments,  they cannot  guarantee  the
tax-exempt status of the income earned thereon from any other investment.

ALTERNATIVE MINIMUM TAX LIABILITY

To the extent that the Fund invests in municipal  obligations  (private activity
bonds) whose  interest is treated as a tax preference  item in  calculating  AMT
liability,  shareholders who calculate AMT liability will be required to include
a portion  of the  Fund's  dividends  as a tax  preference  item in making  this
calculation. In addition,  corporate shareholders may be required to include all
dividends and distributions by the Fund in an adjustment of alternative  minimum
taxable income for purposes of the AMT and the  environmental  tax imposed under
Internal Revenue Code Sections 55 and 59A, respectively.

MANAGEMENT

INVESTMENT MANAGEMENT

American  Century-Benham  Limited-Term Tax-Free Fund is a series of the American
Century Municipal Trust (the "Trust"), a Massachusetts  business trust, formerly
known as the  Benham  Municipal  Trust.  Under the laws of the  Commonwealth  of
Massachusetts,  the Board of Trustees is  responsible  for managing the business
and affairs of the Trust.

Acting  pursuant to an  investment  management  agreement  entered into with the
Trust,  American Century Investment  Management,  Inc. (the "Manager") serves as
the  investment  manager of the Fund.  The Manager  pays all the expenses of the
Fund except brokerage,  taxes, interest, fees and expenses of the non-interested
person  Trustees  (including  counsel  fees)  and  extraordinary  expenses.  Its
principal  place of business is 4500 Main Street,  Kansas City,  Missouri 64111.
The Manager  has been  providing  investment  advisory  services  to  investment
companies and other clients since 1958.

The Manager  supervises  and manages the  investment  portfolio  of the Fund and
directs the purchase and sale of its investment securities. It utilizes teams of
portfolio managers, assistant portfolio managers and analysts acting together to
manage the  assets of the Fund.  The teams meet  regularly  to review  portfolio
holdings and to discuss purchase and sale activity. The teams adjust holdings in
the  Fund's  portfolio  and the  Fund's  asset mix as they deem  appropriate  in
pursuit of the Fund's investment objective. Individual portfolio manager members
of the team may also adjust portfolio  holdings of the Fund or of sectors of the
Fund as necessary between team meetings.

The portfolio  manager  members of the teams managing the Fund described in this
Prospectus and their work experience for the last five years are as follows:

     COLLEEN M. DENZLER,  Senior Municipal Portfolio Manager, joined the Manager
in  January  1996 and is a member  of the team that  manages  the Fund and other
Benham tax-exempt and tax-free funds. Prior to joining the Manager,  Ms. Denzler
was a portfolio  manager with the Calvert  Group for 10 years,  specializing  in
state tax-exempt portfolios. Ms. Denzler is a Chartered Financial Analyst and is
a member of the  Association  for Investment  Management and Research (AIMR) and
The Washington Society of Investment Analysts.

     G. DAVID  MACEWEN  joined  American  Century in 1991 as a Senior  Municipal
Portfolio  Manager,  and is a member  of the teams  that  manages  other  Benham
tax-exempt  and tax-free  funds.  Prior to joining the Manager,  Mr. MacEwen was
Vice  President and Municipal  Portfolio  Manager with  Provident  Institutional
Management Corporation, Wilmington, Delaware.

     JOEL SILVA joined  American  Century in 1989,  serving  first as a customer
service representative, then moving to position as a municipal bond trader. As a
Municipal  Portfolio  Manager,  Mr.  Silva is a member of the teams that manages
Benham tax-exempt and tax-free funds.

The  activities  of the Manager are subject only to the direction of the Trust's
Board of Trustees.  For the services  provided to the Fund, the Manager receives
an annual fee of which is  computed  at 0.55% of average net assets of the Fund.
The rate at which this fee is  assessed  is  determined  annually  in a two-step
process:  First, a fee rate schedule is applied to the assets of all of the bond
funds managed by the Manager (the "Investment Category Fee"). Second, a separate
fee rate schedule is applied to the assets of all of the mutual funds managed by
the Manager (the "Complex Fee"). The Investment Category Fee and the Complex Fee
are then added to  determine  the annual fee payable by the Fund to the Manager.
For the current fiscal year, the Investment Category Fee is 0.25% of average net
assets of the Fund.  The  Complex  Fee is 0.30% of the average net assets of the
Fund. Further  information about the calculation of the annual management fee is
contained in the Statement of Additional Information.

     On the first business day of each month,  the Fund pays a management fee to
the  Manager  for the  previous  month at the  specified  rate.  The fee for the
previous month is calculated by  multiplying  the applicable fee for the Fund by
the  aggregate  average  daily closing value of the Fund's net assets during the
previous  month by a fraction,  the  numerator of which is the number of days in
the previous month and the denominator of which is 365 (366 in leap years).

CODE OF ETHICS

The Fund and the Manager have adopted a Code of Ethics which restricts  personal
investing practices by employees of the Manager and its affiliates.  Among other
provisions,   the  Code  of  Ethics  requires  that  employees  with  access  to
information  about the purchase or sale of  securities  in the Fund's  portfolio
obtain  preclearance before executing personal trades. With respect to Portfolio
Managers  and  other  investment   personnel,   the  Code  of  Ethics  prohibits
acquisition  of securities  in an initial  public  offering,  as well as profits
derived from the purchase and sale of the same security within 60 calendar days.
These  provisions  are  designed  to  ensure  that  the  interests  of the  Fund
shareholders come before the interests of the people who manage the Fund.

TRANSFER AND ADMINISTRATIVE SERVICES

American Century Services  Corporation,  4500 Main Street, Kansas City, Missouri
64111 (the "transfer  agent") acts as transfer agent and  dividend-paying  agent
for the Fund. It provides facilities, equipment and personnel to the Fund and is
paid for such services by the Manager.  For administrative  services provided to
the Fund, the transfer agent is paid by the Manager out of its management fee.

Certain  recordkeeping  and  administrative  services  that would  otherwise  be
performed  by the transfer  agent may be  performed  by an insurance  company or
other  entity  providing  similar  services for various  retirement  plans using
shares of the Fund as a funding medium, by broker-dealers and financial advisors
for their  customers  investing in shares of American  Century or by sponsors of
multi  mutual  fund  no- or  low-transaction  fee  program.  The  Manager  or an
affiliate  may  enter  into  contracts  to pay them for such  recordkeeping  and
administrative services out of its management fee.

Although there is no sales charge levied by the Fund,  transactions in shares of
the  Fund may be  executed  by  brokers  or  investment  advisors  who  charge a
transaction-based  fee or other fee for their  services.  Such  charges may vary
among  broker-dealers and financial advisors,  but in all cases will be retained
by the  broker-dealer  or financial  advisor and not remitted to the Fund or the
investment manager.  You should be aware of the fact that these transactions may
be made directly with American Century without incurring such fees.

The  Manager  and the  transfer  agent are both  wholly  owned by ACC.  James E.
Stowers Jr.,  Chairman of the Board of Directors of ACC,  controls ACC by virtue
of his ownership of a majority of its common stock.

DISTRIBUTION OF FUND SHARES

The Fund's shares are distributed by American Century Investment Services,  Inc.
(the "Distributor"), a registered broker-dealer and an affiliate of the Manager.
The Manager pays all expenses for promoting and  distributing  the Fund's shares
offered by this Prospectus.  The Fund does not pay any commissions or other fees
to the Distributor or to any other broker-dealers or financial intermediaries in
connection with the distribution of Fund shares.

FURTHER INFORMATION ABOUT AMERICAN CENTURY

American Century Municipal Trust was organized as a Massachusetts business trust
on May 1,  1984.  The Trust is a  diversified,  open-end  management  investment
company.  Its  business  and  affairs  are  managed  by its  officers  under the
direction of its Board of Trustees.

The principal office of the Trust is American  Century Tower,  4500 Main Street,
P.O. Box 419200, Kansas City, Missouri 64141-6200.  All inquiries may be made by
mail to that address, or by telephone to 1-800-345-2021.  (international  calls:
816-531-5575.)

The Fund is an  individual  series of the Trust which issues  shares with no par
value.  The assets belonging to each series of shares are held separately by the
custodian and in effect each series is a separate fund.

Each share is entitled to one vote for each dollar of net asset value applicable
to such share on all questions.  Matters  affecting only one fund are voted upon
only by that fund.

Shares of the Trust have  non-cumulative  voting  rights,  which  means that the
holders of more than 50% of the votes cast in an election of Trustees  can elect
all of the  Trustees  if they  choose to do so, and in such event the holders of
the remaining votes will not be able to elect any person or persons to the Board
of Trustees.

Unless  required by the 1940 Act, it will not be necessary for the Trust to hold
annual meetings of  shareholders.  As a result,  shareholders  may not vote each
year on the  election of members of the Board or the  appointment  of  auditors.
However,  pursuant to the Trust's by-laws, the holders of shares representing at
least 10% of the votes  entitled  to be cast may  request  that the Trust hold a
special meeting of shareholders. The Trust will assist in the communication with
other shareholders.

WE RESERVE THE RIGHT TO CHANGE ANY OF OUR  POLICIES,  PRACTICES  AND  PROCEDURES
DESCRIBED IN THIS PROSPECTUS, INCLUDING THE STATEMENT OF ADDITIONAL INFORMATION,
WITHOUT  SHAREHOLDER  APPROVAL  EXCEPT  IN  THOSE  INSTANCES  WHERE  SHAREHOLDER
APPROVAL IS EXPRESSLY REQUIRED.

THIS  PROSPECTUS  CONSTITUTES  AN OFFER TO SELL  SECURITIES  OF THE FUND ONLY IN
THOSE STATES WHERE THE FUND'S SHARES HAVE BEEN REGISTERED OR OTHERWISE QUALIFIED
FOR SALE. THE FUND WILL NOT ACCEPT  APPLICATIONS FROM PERSONS RESIDING IN STATES
WHERE THE FUND'S SHARES ARE NOT REGISTERED.




P.O. Box 419200
Kansas City, Missouri
64141-6200

Person-to-person assistance:
1-800-345-2021 or 816-531-5575

Automated Information Line:
1-800-345-8765

Telecommunications Device for the Deaf:
1-800-634-4113 or 816-753-1865

Fax: 816-340-7962

Internet: www.americancentury.com

                            [american century logo]
                                    American
                                  Century(sm)

9701           [recycled logo]
SH-BKT-6159       Recycled
<PAGE>
                      STATEMENT OF ADDITIONAL INFORMATION

                                 [company logo]

                              ______________, 1997

                                     BENHAM
                                     GROUP(R)

                             Tax-Free Money Market
                           Intermediate-Term Tax-Free
                             Limited-Term Tax-Free
                               Long-Term Tax-Free

                                 [front cover]



                      STATEMENT OF ADDITIONAL INFORMATION

                           ___________________, 1997

AMERICAN CENTURY MUNICIPAL TRUST

This is the Statement of Additional Information for the American Century--Benham
Tax-Free Money Market Fund, American Century--Benham  Intermediate-Term Tax-Free
Fund,  American   Century--Benham   Limited-Term   Tax-Free  Fund  and  American
Century--Benham  Long-Term Tax-Free Fund. This Statement is not a prospectus but
should  be  read  in  conjunction  with  the  Funds'  current  Prospectus  dated
_____________,  1997. The Funds' annual report for the fiscal year ended May 31,
1996,  is  incorporated  herein by  reference.  Please  retain this document for
future reference.  To obtain the Prospectus,  call American Century  Investments
toll-free at 1-800-345-2021  (international calls: 816-531-5575),  or write P.O.
Box 419200, Kansas City, Missouri 64141-6200.

TABLE OF CONTENTS

Investment Policies and Techniques ................ 2
Investment Restrictions ........................... 8
Portfolio Transactions ............................10
Valuation of Portfolio Securities .................10
Performance .......................................12
Taxes .............................................13
About the Trust ...................................15
Trustees and Officers .............................16
Investment Advisory Services ......................17
Transfer and Administrative Services ..............18
Distribution of Fund Shares .......................19
Direct Fund Expenses ..............................19
Expense Limitation Agreement ......................19
Additional Purchase and Redemption
   Information ....................................19
Other Information .................................20

     NOTE: Throughout this document, Tax-Free Money Market Fund will be referred
to as the Money Market Fund.  Intermediate-Term Tax-Free Fund (Intermediate-Term
Fund),  Limited-Term  Tax-Free Fund  (Limited-Term  Fund) and Long-Term Tax-Free
Fund (Long-Term Fund) are referred to collectively as the Variable-Price Funds.




INVESTMENT POLICIES AND TECHNIQUES

     The following  pages provide a more detailed  description of securities and
investment practices  identified in the Prospectus.  Unless otherwise noted, the
policies  described  in  this  Statement  of  Additional   Information  are  not
fundamental and may be changed by the Board of Trustees.

MUNICIPAL NOTES

     Municipal  notes are issued by state and local  governments  or  government
entities to provide short-term capital or to meet cash flow needs.

     TAX  ANTICIPATION  NOTES (TANs) are issued in  anticipation of seasonal tax
revenues,  such as ad valorem property,  income, sales, use, and business taxes,
and are payable from these future  taxes.  Tax  anticipation  notes  usually are
general  obligations  of the  issuer.  General  obligations  are  secured by the
issuer's  pledge of its full  faith and  credit  (i.e.,  taxing  power)  for the
payment of principal and interest.

     REVENUE  ANTICIPATION  NOTES  (RANs) are issued with the  expectation  that
receipt  of  future  revenues,  such as  federal  revenue  sharing  or state aid
payments,  will be  used  to  repay  the  notes.  Typically,  these  notes  also
constitute general obligations of the issuer.

     BOND  ANTICIPATION  NOTES  (BANs) are issued to provide  interim  financing
until long-term  financing can be arranged.  In most cases,  the long-term bonds
provide the money for repayment of the notes.

     TAX-EXEMPT  COMMERCIAL PAPER is an obligation with a stated maturity of 365
days or less issued to finance seasonal cash flow needs or to provide short-term
financing in anticipation of longer-term financing.

MUNICIPAL BONDS

     Municipal bonds, which generally have maturities of more than one year when
issued,  are designed to meet longer-term  capital needs.  These securities have
two principal classifications: general obligation bonds and revenue bonds.

     GENERAL  OBLIGATION  (GO)  BONDS are issued by  states,  counties,  cities,
towns, and regional  districts to fund a variety of public  projects,  including
construction  of and  improvements  to  schools,  highways,  and water and sewer
systems.  General  obligation  bonds are backed by the  issuer's  full faith and
credit based on its ability to levy taxes for the timely payment of interest and
repayment  of  principal,  although  such  levies  may  be  constitutionally  or
statutorily limited as to rate or amount.

     REVENUE  BONDS are not  backed by an  issuer's  taxing  authority;  rather,
interest  and  principal  are  secured  by the net  revenues  from a project  or
facility.  Revenue  bonds are issued to  finance a variety of capital  projects,
including  construction or refurbishment of utility and waste disposal  systems,
highways, bridges, tunnels, air and sea port facilities, schools, and hospitals.
Many  revenue  bond issuers  provide  additional  security in the form of a debt
service  reserve  fund  that  may be used  to  make  payments  of  interest  and
repayments  of  principal  on  the  issuer's  obligations.   Some  revenue  bond
financings are further  protected by a state's  assurance  (without  obligation)
that it will make up deficiencies in the debt service reserve fund.

     INDUSTRIAL  DEVELOPMENT BONDS (IDBs), types of revenue bonds, are issued by
or on behalf of public  authorities to finance  privately  operated  facilities.
These bonds are used to finance business, manufacturing,  housing, athletic, and
pollution  control projects as well as public  facilities,  such as mass transit
systems, air and sea port facilities,  and parking garages.  Payment of interest
and  repayment  of  principal  on an IDB  depends  solely on the  ability of the
facility's user to meet its financial  obligations and on the pledge, if any, of
the real or  personal  property  financed.  The  interest  earned on IDBs may be
subject to the federal alternative minimum tax.

VARIABLE- AND FLOATING-RATE DEMAND OBLIGATIONS

     The Funds may buy variable- and floating-rate demand obligations (VRDOs and
FRDOs).  These obligations carry rights that permit holders to demand payment of
the unpaid  principal,  plus  accrued  interest,  from the issuers or  financial
intermediaries.  Floating-rate  instruments  have  interest  rates  that  change
whenever there is a change in a designated base rate; variable-rate  instruments
provide for a specified,  periodic  adjustment  in the interest  rate,  which is
typically  based on an index.  These formulas are designed to result in a market
value for the VRDO or FRDO that approximates par value.

     The Board of Trustees  has approved  investments  in VRDOs and FRDOs on the
following conditions:

     (1) The  Fund  must  have an  unconditional  right to  demand  a return  of
principal plus accrued interest from the issuer on 30 days' notice or less;

     (2)  Under  the  direction  of the  Board of  Trustees,  Benham  Management
Corporation  (American Century Investment  Management,  Inc. with respect to the
Limited-Term  Fund) (the  "Manager") must determine that the issuer will be able
to make payment upon such  demand,  either from its own  resources or through an
unqualified commitment (such as a letter of credit) from a third party; and

     (3) The rate of interest  payable on the VRDO or FRDO must be calculated to
ensure  that its  market  value  will  approximate  par value on  interest  rate
adjustment dates.

OBLIGATIONS WITH TERM PUTS ATTACHED

     Each Fund may invest in fixed-rate bonds subject to third party puts and in
participation  interests  in such  bonds  held by a bank in trust or  otherwise.
These bonds and  participation  interests have tender options or demand features
that  permit  the Funds to tender  (or put)  their  bonds to an  institution  at
periodic intervals and to receive the principal amount thereof.

     The Manager  expects that the Funds will pay more for securities  with puts
attached than for securities without these liquidity  features.  The Manager may
buy  securities  with puts  attached to keep a Fund fully  invested in municipal
securities while maintaining  sufficient  portfolio liquidity to meet redemption
requests or to facilitate  management of the Funds' investments.  To ensure that
the interest on municipal securities subject to puts is tax-exempt to the Funds,
the  Manager  limits  the  Funds'  use of puts  in  accordance  with  applicable
interpretations and rulings of the Internal Revenue Service (IRS).

     Because it is  difficult  to  evaluate  the  likelihood  of exercise or the
potential  benefit of a put, puts normally will be determined to have a value of
zero,  regardless  of whether  any  direct or  indirect  consideration  is paid.
Accordingly,  puts as separate  securities are not expected to affect the Funds'
weighted average  maturities.  Where a Fund has paid for a put, the cost will be
reflected as unrealized  depreciation on the underlying  security for the period
the put is held. Any gain on the sale of the underlying security will be reduced
by the cost of the put.

     There is a risk that the seller of a put will not be able to repurchase the
underlying  obligation  when (or if) a Fund  attempts  to  exercise  the put. To
minimize such risks, the Funds will purchase obligations with puts attached only
from sellers deemed creditworthy by the Manager under the direction of the Board
of Trustees.

TENDER OPTION BONDS

     Tender  option  bonds  (TOBs) are  created by  municipal  bond  dealers who
purchase  long-term   tax-exempt  bonds  in  the  secondary  market,  place  the
certificates  in trusts,  and sell  interests  in the trusts  with puts or other
liquidity  guarantees  attached.  The credit quality of the resulting  synthetic
short-term  instrument  is based on the  guarantor's  short-term  rating and the
underlying bond's long-term rating.

     There is some risk that a remarketing  agent will renege on a tender option
agreement if the underlying bond is downgraded or defaults. Because of this, the
Manager  monitors the credit quality of bonds underlying the Funds' TOB holdings
and  intends  to sell or put back any TOB if the rating on its  underlying  bond
falls  below the second  highest  rating  category  designated  by a  nationally
recognized statistical rating agency (a "rating agency").

     The Manager also takes steps to minimize the risk that the Fund may realize
taxable   income  as  a  result  of  holding  TOBs.   These  steps  may  include
consideration  of (a) legal opinions  relating to the  tax-exempt  status of the
underlying  municipal bonds, (b) legal opinions relating to the tax ownership of
the underlying  bonds, and (c) other elements of the structure that could result
in taxable income or other adverse tax consequences.

     After  purchase,  the Manager  monitors  factors  related to the tax-exempt
status of the Fund's TOB  holdings in order to minimize  the risk of  generating
taxable income.

     TOBs were  created  to  increase  the  supply of  high-quality,  short-term
tax-exempt obligations,  and, thus, they are of particular interest to the Money
Market Fund. However, any of the Funds may purchase these instruments.

WHEN-ISSUED AND FORWARD
COMMITMENT AGREEMENTS

     The Funds may engage in securities transactions on a when-issued or forward
commitment basis in which the transaction  price and yield are each fixed at the
time the  commitment  is made,  but payment and delivery  occur at a future date
(typically 15 to 45 days later).

     When purchasing  securities on a when-issued or forward  commitment  basis,
each Fund  assumes  the rights and risks of  ownership,  including  the risks of
price and yield fluctuations.  Although a Fund will make commitments to purchase
or sell securities with the intention of actually  receiving or delivering them,
it may  nevertheless  sell the securities  before the settlement  date if deemed
advisable as a matter of investment strategy.

     In purchasing  securities on a when-issued or forward  commitment  basis, a
Fund will establish and maintain until the settlement date a segregated  account
consisting of cash, U.S.  government  securities,  or other high-quality  liquid
debt  securities in an amount  sufficient to meet the purchase  price.  When the
time comes to pay for when-issued securities, the Fund will meet its obligations
with  available  cash,  through sales of securities,  or,  although it would not
normally  expect  to do so,  through  the  sale  of the  when-issued  securities
themselves  (which  may have a market  value  greater  or less  than the  Fund's
payment   obligation).   Selling  securities  to  meet  when-issued  or  forward
commitment obligations may generate taxable capital gains or losses.

     The Funds may sell a  security  and at the same time make a  commitment  to
purchase the same security at a future date and specified price. Conversely, the
Funds may purchase a security and at the same time make a commitment to sell the
same security at a future date and specified price.  These types of transactions
are   executed   simultaneously   in  what  are   known  as   "dollar-roll"   or
"cash-and-carry" transactions. For example, a broker-dealer may seek to purchase
a particular  security  that the Funds own. The Funds will sell that security to
the broker-dealer and simultaneously  enter into a forward commitment  agreement
to buy it back at a future date. This type of transaction  generates  income for
the Funds if the dealer is willing to execute  the  transaction  at a  favorable
price in order to acquire a specific security.

     As an operating  policy,  each Fund will not commit greater than 50% of its
total assets to when-issued or forward commitment agreements. If fluctuations in
the value of securities  held cause more than 50% of a Fund's total assets to be
committed under when-issued or forward commitment  agreements,  the Manager need
not sell such  agreements,  but it will be restricted from entering into further
agreements  on behalf of the Fund until the  percentage  of assets  committed to
such agreements is below 50% of total assets.

MUNICIPAL LEASE OBLIGATIONS

     Each Fund may invest in municipal  lease  obligations.  These  obligations,
which may take the form of a lease,  an installment  purchase,  or a conditional
sale  contract,  are issued by state and local  governments  and  authorities to
acquire land and a wide  variety of equipment  and  facilities.  Generally,  the
Funds will not hold such  obligations  directly as a lessor of the  property but
will purchase a participation  interest in a municipal  lease  obligation from a
bank or other third party.

     Municipal leases frequently carry risks distinct from those associated with
general obligation or revenue bonds. State  constitutions and statutes set forth
requirements that states and  municipalities  must meet to incur debt. These may
include  voter  referenda,  interest rate limits,  or public sale  requirements.
Leases,  installment  purchases,  or conditional  sale contracts (which normally
provide for title to the leased  asset to pass to the  government  issuer)  have
evolved  as a way for  government  issuers  to acquire  property  and  equipment
without meeting  constitutional  and statutory  requirements for the issuance of
debt.

     Many leases and contracts include  nonappropriation  clauses providing that
the  governmental  issuer has no  obligation to make future  payments  under the
lease  or  contract  unless  money is  appropriated  for  such  purposes  by the
appropriate  legislative  body on a yearly or other  periodic  basis.  Municipal
lease   obligations  also  may  be  subject  to  abatement  risk.  For  example,
construction  delays or  destruction of a facility as a result of an uninsurable
disaster  that  prevents  occupancy  could result in all or a portion of a lease
payment not being made.

INVERSE FLOATERS (VARIABLE-PRICE FUNDS)

     An inverse floater is a type of derivative that bears an interest rate that
moves  inversely to market  interest  rates.  As market interest rates rise, the
interest rate on an inverse floater goes down, and vice versa. Generally this is
accomplished  by  expressing  the  interest  rate on the  inverse  floater as an
above-market  fixed  rate  of  interest,  reduced  by an  amount  determined  by
reference to a market-based or bond-specific  floating interest rate (as well as
by any fees associated with administering the inverse floater program).

     Inverse floaters may be issued in conjunction with an equal amount of Dutch
Auction  floating-rate bonds (floaters),  or a market-based index may be used to
set the interest rate on these securities.  Floaters and inverse floaters may be
brought to market by a broker-dealer  who purchases  fixed-rate bonds and places
them in a trust or by an issuer seeking to reduce  interest  expenses by using a
floater/inverse floater structure in lieu of fixed-rate bonds.

     In the  case  of a  broker-dealer  structured  offering  (where  underlying
fixed-rate bonds have been placed in a trust), distributions from the underlying
bonds are  allocated  to floater and inverse  floater  holders in the  following
manner:

     (a) Floater holders receive interest based on rates set at a Dutch Auction,
which is typically  held every 28 to 35 days.  Current and  prospective  floater
holders  bid the  minimum  interest  rate that they are willing to accept on the
floaters,  and the  interest  rate is set just high enough to ensure that all of
the floaters are sold.

     (b) Inverse floater holders receive all of the interest that remains on the
underlying bonds after floater interest and auction fees are paid.

     Procedures  for  determining  the interest  payment on floaters and inverse
floaters  brought to market directly by the issuer are comparable,  although the
interest paid on such inverse  floaters is based on a presumed  coupon rate that
would have been  required  to bring  fixed-rate  bonds to market at the time the
floaters and inverse floaters were issued.

     Where inverse  floaters are issued in conjunction  with  floaters,  inverse
floater holders may be given the right to acquire the underlying security (or to
create a fixed-rate bond) by calling an equal amount of corresponding  floaters.
The underlying security may then be held or sold.  However,  typically there are
time  constraints  and other  limitations  associated  with any right to combine
interests and claim the underlying security.

     Floater holders subject to a Dutch Auction procedure  generally do not have
the right to "put back" their  interests to the issuer or to a third party. If a
Dutch  Auction  fails,  the floater  holder may be required to hold its position
until the underlying bond matures; during which time, interest on the floater is
capped at a predetermined rate.

     The secondary market for floaters and inverse floaters may be limited.  The
market value of inverse  floaters tends to be  significantly  more volatile than
fixed-rate  bonds.  The interest rates on inverse  floaters may be significantly
reduced, even to zero, if interest rates rise.

RESTRICTED SECURITIES

     The Funds may buy securities  that are subject to  restrictions  on resale.
These  securities  will be deemed  illiquid  unless  (a) the  Board of  Trustees
establishes  guidelines for determining  the liquidity of restricted  securities
and (b) the  securities (on a case by case basis) are determined to be liquid in
accordance with Board-approved guidelines.

SHORT-TERM INVESTMENTS (VARIABLE-PRICE FUNDS)

     Under  certain  circumstances,  the  Variable-Price  Funds  may  invest  in
short-term  municipal  or U.S.  government  securities,  including  money market
instruments (short-term securities).  Except as otherwise required for temporary
defensive  purposes,  the Manager does not expect these  Funds'  investments  in
short-term  securities to exceed 35% of total assets.  If a Fund invests in U.S.
government  securities,  a portion of  dividends  paid to  shareholders  will be
taxable at the federal level, and may be taxable at the state level, as ordinary
income. The Manager intends to minimize such investments, however, and may allow
the Funds to hold  cash to avoid  generating  taxable  dividends  when  suitable
short-term municipal securities are unavailable.

     Pursuant  to  an  exemptive  order  that  the  Manager  received  from  the
Securities  and  Exchange   Commission   (SEC),  for  liquidity   purposes  each
Variable-Price Fund may invest up to 5% of its total assets in shares of a money
market fund advised by the Manager,  provided that the  investment is consistent
with the Fund's investment policies and restrictions.

CONCENTRATION  OF ASSETS IN OBLIGATIONS  ISSUED TO FINANCE  SIMILAR  PROJECTS OR
FACILITIES

     From time to time, a significant portion of a Fund's assets may be invested
in  municipal  obligations  related to the extent that  economic,  business,  or
political developments affecting one of these obligations could affect the other
obligations in a similar manner.  For example,  if a Fund invested a significant
portion of its assets in utility bonds and a state or federal  government agency
or  legislative  body  promulgated  or  enacted  new  environmental   protection
requirements for utility  providers,  projects  financed by utility bonds that a
Fund holds could suffer as a class.  Additional  financing  might be required to
comply with the new  environmental  requirements,  and outstanding debt might be
downgraded  in the interim.  Among other  factors that could  negatively  affect
bonds  issued to  finance  similar  types of  projects  are  state  and  federal
legislation regarding financing for municipal projects,  pending court decisions
relating  to the  validity  of or the  means of  financing  municipal  projects,
material  or  manpower  shortages,  and  declining  demand for the  projects  or
facilities financed by the municipal bonds.

FUTURES AND OPTIONS (VARIABLE-PRICE FUNDS)

     Each  Variable-Price  Fund may enter into futures  contracts,  options,  or
options on futures  contracts.  Some  futures  and options  strategies,  such as
selling  futures,  buying puts,  and writing calls,  hedge a Fund's  investments
against price fluctuations.  Other strategies,  such as buying futures,  writing
puts, and buying calls,  tend to increase market exposure.  The Funds do not use
futures and options transactions for speculative purposes.

     Although  other  techniques  may be used to  control a Fund's  exposure  to
market fluctuations,  the use of futures contracts can be a more effective means
of hedging this exposure.  While a Fund pays brokerage commissions in connection
with  opening  and closing  out  futures  positions,  these costs are lower than
transaction   costs  incurred  in  the  purchase  and  sale  of  the  underlying
securities.

     FUTURES CONTRACTS provide for the sale by one party and purchase by another
party of a specific  security  at a  specified  future  time and price.  Futures
contracts  are traded on  national  futures  exchanges.  Futures  exchanges  and
trading are regulated under the Commodity  Exchange Act by the Commodity Futures
Trading  Commission  (CFTC), a U.S.  government  agency. The Funds may engage in
futures and options  transactions based on securities indexes,  such as the Bond
Buyer Index of Municipal Bonds,  that are consistent with the Funds'  investment
objectives.  The Funds may also engage in futures and options transactions based
on specific securities, such as U.S. Treasury bonds or notes.

     Bond Buyer Municipal Bond Index futures  contracts  differ from traditional
futures  contracts in that when  delivery  takes place,  no bonds change  hands.
Instead,  these  contracts  settle  in  cash at the  spot  market  value  of the
Municipal Bond Index. Although other types of futures contracts, by their terms,
call for actual  delivery or acceptance of the  underlying  securities,  in most
cases the  contracts  are  closed  out before  the  settlement  date.  A futures
position may be closed by taking an opposite  position in an identical  contract
(i.e.,  buying a contract  that has  previously  been sold or selling a contract
that has previously been bought).

     To initiate and  maintain an open  position in a futures  contract,  a Fund
would be  required to make a  good-faith  margin  deposit in cash or  government
securities  with a broker or custodian.  A margin  deposit is intended to assure
completion of the contract  (delivery or acceptance of the underlying  security)
if it is not terminated  prior to the specified  delivery date.  Minimum initial
margin requirements are established by the futures exchanges and may be revised.
In addition,  brokers may establish margin deposit  requirements that are higher
than the exchange minimums.

     Once a futures  contract  position is opened,  the value of the contract is
marked to market daily. If the futures contract price changes to the extent that
the margin on deposit does not satisfy margin requirements,  the contract holder
is required to pay additional  "variation"  margin.  Conversely,  changes in the
contract  value may reduce the  required  margin,  resulting  in a repayment  of
excess margin to the contract  holder.  Variation margin payments are made to or
from the broker for as long as the contract  remains open and do not  constitute
margin transactions for purposes of the Funds' investment restrictions.

     RISKS  RELATED TO FUTURES  AND  OPTIONS  TRANSACTIONS.  Futures and options
prices can be volatile,  and trading in these markets involves certain risks. If
the Manager  applies a hedge at an  inappropriate  time or judges  interest rate
trends incorrectly,  futures and options strategies may lower a Fund's return. A
Fund could also suffer losses if the prices of its futures and options positions
were poorly correlated with its other investments, or if it were unable to close
out its position because of an illiquid secondary market.

     Futures  contracts  may be closed out only on an exchange  that  provides a
secondary  market for these  contracts,  and there is no assurance that a liquid
secondary  market  will  exist  for  any  particular  futures  contract  at  any
particular  time.  Consequently,  it might  not be  possible  to close a futures
position when the Manager considers it appropriate or desirable to do so. In the
event of adverse price  movements,  a Fund would be required to continue  making
daily  cash  payments  to  maintain  its  required  margin.   If  the  Fund  had
insufficient  cash,  it might have to sell  portfolio  securities  to meet daily
margin  requirements  at a time when the Manager would not otherwise elect to do
so.  In  addition,  a Fund  may be  required  to  deliver  or take  delivery  of
instruments  underlying the futures contracts it holds. The Manager will seek to
minimize  these risks by limiting the  contracts it enters into on behalf of the
Funds to those traded on national futures  exchanges and for which there appears
to be a liquid secondary market.

     A Fund  could  suffer  losses if the  prices  of its  futures  and  options
positions  were poorly  correlated  with its other  investments or if securities
underlying futures contracts purchased by the Fund had different maturities than
those of the portfolio  securities being hedged. Such imperfect  correlation may
give rise to  circumstances  in which the Fund loses money on a futures contract
at the same  time that it  experiences  a  decline  in the  value of its  hedged
portfolio securities.  The Fund could also lose margin payments it has deposited
with a margin broker if, for example, the broker becomes bankrupt.

     Most futures exchanges limit the amount of fluctuation permitted in futures
contract  prices during a single  trading day. The daily limit  establishes  the
maximum  amount that the price of a futures  contract may vary either up or down
from the previous day's settlement price at the end of the trading session. Once
the daily limit has been reached in a particular type of contract, no trades may
be made on that day at a price  beyond  the  limit.  However,  the  daily  limit
governs only price movement during a particular trading day and, therefore, does
not limit potential losses. In addition, the daily limit may prevent liquidation
of unfavorable positions. Futures contract prices have occasionally moved to the
daily  limit for  several  consecutive  trading  days with little or no trading,
thereby  preventing prompt  liquidation of futures positions and subjecting some
futures traders to substantial losses.

     OPTIONS ON FUTURES.  By purchasing an option on a futures contract,  a Fund
obtains the right,  but not the obligation,  to sell the futures contract (a put
option) or to buy the contract (a call option) at a fixed "strike" price. A Fund
can  terminate  its  position  in a put  option by  allowing  it to expire or by
exercising the option.  If the option is exercised,  the Fund completes the sale
of the  underlying  security  at the  strike  price.  Purchasing  an option on a
futures  contract  does not  require a Fund to make margin  payments  unless the
option is exercised.

     Although  they do not  currently  intend to do so,  the Funds may write (or
sell)  call  options  that  obligate  them to sell  (or  deliver)  the  option's
underlying  instrument upon exercise of the option.  While the receipt of option
premiums would mitigate the effects of price  declines,  the Funds would give up
some ability to participate in a price increase on the underlying security. If a
Fund engages in options  transactions,  it would own the futures contract at the
time a call was written and would keep the contract open until the obligation to
deliver it pursuant to the call expired.

     RESTRICTIONS   ON  THE  USE  OF  FUTURES   CONTRACTS   AND  OPTIONS.   Each
Variable-Price  Fund may enter into futures  contracts,  options,  or options on
futures contracts,  provided that such obligations represent no more than 20% of
the Fund's net assets.  Under the Commodity  Exchange Act, a fund may enter into
futures and options  transaction (a) for hedging  purposes without regard to the
percentage of assets  committed to initial margin and option premiums or (b) for
other than hedging  purposes,  provided that assets  committed to initial margin
and option  premiums  do not exceed 5% of the fund's net  assets.  To the extent
required by law, each Fund will set aside cash and appropriate  liquid assets in
a segregated  account to cover its obligations  related to futures contracts and
options.

     The  Funds  intend  to  comply  with  tax  rules  applicable  to  regulated
investment  companies,  including a requirement that capital gains from the sale
of securities  held less than three months  constitute less than 30% of a Fund's
gross income for each fiscal year.  Gains on some futures  contracts and options
are included in this 30% calculation,  which may limit the Funds' investments in
such instruments.

OTHER INVESTMENT COMPANIES

     Each Fund may invest in securities issued by open and closed-end investment
companies  advised  by the  Manager  which are  consistent  with its  investment
objective  and  policies.  Under the 1940 Act,  the  Fund's  investment  in such
securities, subject to certain exceptions, currently is limited to (a) 3% of the
total  voting  stock of any one  investment  company,  (b) 5% of the  Fund's net
assets with respect to any one investment  company and (c) 10% of the Fund's net
assets in the aggregate. Such purchases will be made in the open market where no
commissions  or profit to a sponsor or dealer  results from the  purchase  other
that the customary brokers'  commission.  As a shareholder of another investment
company, a Fund would bear, along with other shareholders,  its pro rata portion
of the other  investment  company's  expenses,  including  advisory fees.  These
expenses  would be in  addition  to the  management  fee that  each  Fund  bears
directly in connection with its own operations.

INVESTMENT RESTRICTIONS

     The Funds' investment  restrictions set forth below are fundamental and may
not be changed  without  approval of a majority of the votes of  shareholders of
each Fund, as determined in accordance with the Investment Company Act of 1940.

     THE MONEY MARKET FUND,  INTERMEDIATE-TERM  FUND AND THE LONG-TERM  FUND MAY
     NOT:

(1)  With respect to 75% of its total  assets,  purchase the  securities  of any
     issuer (other than securities  issued or guaranteed by the U.S.  government
     or any of its agencies or instrumentalities) if, as a result, (a) more than
     5% of the Fund's total assets would be invested in the  securities  of that
     issuer,  or (b) the Fund would own more than 10% of the outstanding  voting
     securities of that issuer.

(2)  Act as an underwriter of securities issued by others,  except to the extent
     that the purchase of municipal securities,  or other permitted investments,
     directly from the issuer thereof or from an  underwriter  for an issuer and
     the later  disposition  of such  securities in  accordance  with the Fund's
     investment policies and techniques may be deemed to be an underwriting.

(3)  Make  loans to others,  except in  accordance  with the  Fund's  investment
     objective and policies.

(4)  Purchase any equity  securities in any companies,  including  warrants,  or
     bonds with warrants attached,  or any preferred stocks,  convertible bonds,
     or convertible debentures.

(5)  Invest in securities that are not readily  marketable or the disposition of
     which is restricted under federal securities laws  (collectively,  illiquid
     securities)  if, as a result,  more than 10% of the Fund's net assets would
     be invested in illiquid securities.

(6)  Purchase or retain  securities  of any issuer if, to the  knowledge  of the
     Fund's  management,  those  officers  and  Trustees of the Trust and of its
     investment  advisor,  who  each  own  beneficially  more  than  0.5% of the
     outstanding securities of such issuer,  together own beneficially more than
     5% of such  securities.  However,  such  restrictions  shall  not  apply to
     holdings of the issuers of industrial development bonds.

(7)  Acquire securities for the purpose of exercising control over management of
     the issuer.

(8)  Purchase  any  security  if, as a  result,  25% or more of the value of the
     Fund's total assets would be invested in the  securities of issuers  having
     their  principal  business  activity in the same  industry.  However,  this
     limitation  does not apply to  securities  issued or guaranteed by the U.S.
     government  or any of its  agencies or  instrumentalities,  or to municipal
     securities of any type.

     THE MONEY MARKET FUND MAY NOT:

(1)  Borrow money in excess of 33 1/3% of the market value of its total  assets,
     and then only from a bank and as a temporary measure to satisfy  redemption
     requests  for  extraordinary  or  emergency  purposes,  and  provided  that
     immediately after any such borrowing there is an asset coverage of at least
     300 per centum for all such borrowings.  To secure any such borrowing,  the
     Fund may not mortgage,  pledge,  or  hypothecate in excess of 331/3% of the
     value of its total  assets.  The Fund will not purchase any security  while
     borrowings representing more than 5% of its total assets are outstanding.

(2)  Purchase, sell, or invest in real estate, commodities, commodity contracts,
     foreign exchange, or interests in oil, gas, or other mineral exploration or
     development programs,  provided that this limitation shall not prohibit the
     purchase of municipal  securities and other debt securities secured by real
     estate or interests therein.

(3)  Engage in any short-selling operations.

(4)  Engage in margin  transactions  or in transactions  involving puts,  calls,
     straddles, or spreads, except that it may purchase and hold securities with
     rights  to put  securities  to  the  seller  or  "standby  commitments"  in
     accordance with its investment techniques.

(5)  Issue or sell any class of senior  security  as defined  in the  Investment
     Company Act of 1940 except to the extent  that notes  evidencing  temporary
     borrowings   or  the   purchase  of   securities   on  a   when-issued   or
     delayed-delivery basis might be deemed such.

(6)  Acquire or retain the securities of any other investment company, except in
     connection with a merger, consolidation, acquisition, or reorganization.

     THE INTERMEDIATE-TERM FUND AND THE LONG-TERM FUND EACH MAY NOT:

(1)  Borrow money in excess of 33 1/3% of the market value of its total  assets,
     and then only from a bank and as a temporary measure to satisfy  redemption
     requests  for  extraordinary  or  emergency  purposes,  and  provided  that
     immediately after any such borrowing there is an asset coverage of at least
     300 per centum for all such borrowings.  To secure any such borrowing,  the
     Fund may not mortgage,  pledge,  or hypothecate in excess of 33 1/3% of the
     value of its total  assets.  The Fund will not purchase any security  while
     borrowings  representing  more than 5% of its total assets are  outstanding
     (the deposit of assets in escrow in connection  with the writing of covered
     put and call options and collateral arrangements with respect to initial or
     variation margin deposits for futures contracts will not be deemed a pledge
     of the Fund's assets).

(2)  Purchase, sell, or invest in real estate, commodities, commodity contracts,
     foreign exchange, or interests in oil, gas, or other mineral exploration or
     development programs,  provided that this limitation shall not prohibit the
     purchase of municipal  securities and other debt securities secured by real
     estate  or  interests  therein,  and  shall  not  prohibit  the  Fund  from
     purchasing,  selling,  or entering into options on securities or indexes of
     securities,  futures contracts,  options on futures contracts, or any other
     interest rate hedging  instrument,  subject to the Fund's  compliance  with
     applicable provisions of the federal securities or commodities laws.

(3)  Engage in any short-selling operations,  except that the Fund may purchase,
     sell, or enter into short  positions in options on securities or indexes of
     securities,  futures contracts, options on futures contracts, and any other
     interest  rate hedging  instrument  as may be  permitted  under the federal
     securities or commodities laws.

(4)  Engage in margin transactions,  except that it may purchase, sell, or enter
     into positions in options on securities or indexes of  securities,  futures
     contracts,  options on futures  contracts,  and other interest rate hedging
     instruments,  and may make margin deposits in connection therewith, and may
     purchase and hold  securities  with rights to put  securities to the seller
     (standby commitments) in accordance with its investment techniques.

(5)  Issue or sell any class of senior  security  as defined  in the  Investment
     Company  Act of 1940  except to the extent  that  transactions  in options,
     futures, options on futures, other interest rate hedging instruments, notes
     evidencing  temporary  borrowings,  or  the  purchase  of  securities  on a
     when-issued or delayed-delivery basis might be deemed such.

(6)  Acquire or retain the securities of any other  investment  company,  except
     that the Fund may, for  temporary  purposes,  purchase  shares of the Money
     Market  Fund,  subject  to such  restrictions  as may be imposed by (i) the
     Investment  Company Act of 1940 and rules  thereunder  or (ii) any state in
     which  shares of the Fund are  registered,  and may  acquire  shares of any
     investment company in connection with a merger, consolidation, acquisition,
     or reorganization.

     THE LIMITED-TERM FUND MAY NOT:

1)   With respect to 75% of its total  assets,  purchase the  securities  of any
     issuer (other than securities  issued or guaranteed by the U.S.  government
     or its agencies or instrumentalities)  if, as a result, (a) more than 5% of
     the Fund's total assets would be invested in securities of that issuer,  or
     (b) the Fund would hold more than 10% of the outstanding  voting securities
     of that issuer.

2)   Issue senior securities, except as permitted under the 1940 Act.

3)   Borrow  money,  except  that the Fund may  borrow  money for  temporary  or
     emergency  purposes  (not for  leveraging or  investment)  in an amount not
     exceeding  33-1/3%  of  the  Fund's  total  assets  (including  the  amount
     borrowed) less liabilities (other than borrowings).

4)   Lend any security or make any other loan if, as a result, more than 33-1/3%
     of the Fund's  total  assets would be lent to other  parties,  except,  (a)
     through  the  purchase  of a  portion  of an  issue of debt  securities  in
     accordance with its investment objective,  policies and limitations, or (b)
     by engaging in repurchase agreements with respect to portfolio securities.

5)   Purchase or sell real estate  unless  acquired as a result of  ownership of
     securities or other  instruments  (but this shall not prevent the Fund from
     investment  in  securities  or other  instruments  backed by real estate or
     securities of companies engaged in the real estate business).

6)   Purchase any  securities  which would cause 25% or more of the value of the
     Fund's  total  assets  at  the  time  of  purchase  to be  invested  in the
     securities  of one or more  issuers  conducting  their  principal  business
     activities in the same  industry,  provided that (a) there is no limitation
     with respect to  obligations  issued or guaranteed by the U.S.  government,
     any state,  territory or possession of the United  States,  the District of
     Columbia  or any  of  their  authorities,  agencies,  instrumentalities  or
     political   subdivisions   and  repurchase   agreements   secured  by  such
     instruments, (b) wholly-owned finance companies will be considered to be in
     the industries of their parents if their  activities are primarily  related
     to financing the  activities of the parents,  (c) utilities will be divided
     according to their services,  for example, gas, gas transmission,  electric
     and  gas,  electric  and  telephone  will  each be  considered  a  separate
     industry,  and (d) personal credit and business  credit  businesses will be
     considered separate industries.

7)   Act as  underwriter  of securities  issued by others,  except to the extent
     that the Fund may be  considered an  underwriter  within the meaning of the
     Securities Act of 1933 in the disposition of restricted securities.

8)   Purchase  or sell  physical  commodities  unless  acquired  as a result  of
     ownership of securities or other instruments.

9)   Invest for purposes of exercising control over management.

     The Funds  are also  subject  to the  following  restrictions  that are not
fundamental  and may  therefore  be  changed  by the Board of  Trustees  without
shareholder approval.

     THE MONEY MARKET FUND,  INTERMEDIATE-TERM  FUND AND THE LONG-TERM  FUND MAY
     NOT:

(a)  Purchase  any  security  if, as a result,  more than 5% of the value of the
     Fund's total assets would be invested in the  securities of issuers that at
     the time of  purchase  had been in  operation  for less than  three  years,
     except  obligations  issued or  guaranteed  by the U.S.  government  or its
     agencies,  and  municipal  securities  (for  this  purpose,  the  period of
     operation  of any  issuer  shall  include  the period of  operation  of any
     predecessor or unconditional guarantor of such issuer); provided,  however,
     that for the  purpose  of this  limitation,  industrial  development  bonds
     issued by nongovernmental users shall not be deemed municipal securities.

(b)  Enter into  when-issued or forward  commitment  transaction  that settle in
     more than 120 days.

     THE LIMITED-TERM FUNDS MAY NOT:

a)    Lend  assets  other  than  securities  to  other  parties,  except  by (a)
     lending  money  (up  to  5% of  the  Fund's  net  assets)  to a  registered
     investment  company or  portfolio  for which its  investment  advisor or an
     affiliate  serves  as  investment  advisor  or (b)  acquiring  loans,  loan
     participation,   or  other  forms  of  direct  debt   instruments   and  in
     connection  therewith,  assuming any associated unfunded commitments of the
     sellers.  (This  limitation  does not apply to purchases of debt securities
     or to repurchase agreements.)

b)   Purchase or sell futures  contracts or call options.  This  limitation does
     not apply to options  attached  to, or  acquired or traded  together  with,
     their  underlying  securities,  and  does  not  apply  to  securities  that
     incorporate features similar to options or futures contracts.

c)   Purchase any security or enter into a repurchase agreement if, as a result,
     more than 15% of its net assets would be invested in repurchase  agreements
     not entitling the holder to payment of principal and interest  within seven
     days and in securities  that are illiquid by virtue of legal or contractual
     restrictions on resale or the absence of a readily available market.

d)   Except  in  connection  with  a  merger,  consolidation,   acquisition,  or
     reorganization,  invest in the  securities of other  investment  companies,
     including  investment  companies  advised by the Manager,  if,  immediately
     after  such  purchase  or  acquisition,  more  than 10% of the value of the
     Fund's total assets would be invested in such securities.

e)   Invest in securities of an issuer that, together with any predecessor,  has
     been in operation  for less than three years if, as a result,  more than 5%
     of the total assets of the Fund would then be invested in such securities.

f)   Purchase warrants,  valued at the lower of cost or market, in excess of 10%
     of the Fund's net  assets.  Included in that amount but not to exceed 2% of
     net assets,  are warrants  whose  underlying  securities  are not traded on
     principal domestic or foreign  exchanges.  Warrants acquired by the Fund in
     units or attached to securities are not subject to these restrictions.

g)   Invest in oil, gas or other mineral exploration or development  programs or
     leases.

h)   Sell securities short, unless it owns or has the right to obtain securities
     equivalent in kind and amount to the  securities  sold short,  and provided
     that  transaction  in  futures  contracts  and  options  are not  deemed to
     constitute selling securities short.

i)   Purchase  securities  on  margin,  except  that the Fund  may  obtain  such
     short-term credits as are necessary for the clearance of transactions,  and
     provided  that margin  payments in  connection  with futures  contracts and
     options on futures contracts shall not constitute  purchasing securities on
     margin.

j)   Purchase the  securities  of any issuer if, to the  knowledge of the Fund's
     management,  those officers and directors of the Fund and of its investment
     advisor,  who each  own  beneficially  more  than  0.5% of the  outstanding
     securities  of such  issuer,  together  own more  than 5% of such  issuer's
     securities.

     Unless otherwise indicated, with the exception of the percentage limitation
on borrowing,  percentage  limitations included in the restrictions apply at the
time transactions are entered into. Accordingly,  any later increase or decrease
beyond the specified limitation resulting from a change in the Fund's net assets
will  not be  considered  in  determining  whether  it  has  complied  with  its
investment restrictions.

     For purposes of the Funds' investment restrictions, the party identified as
the "issuer" of a municipal  security  depends on the form and conditions of the
security.  When the assets and revenues of a political  subdivision are separate
from those of the government  that created the  subdivision  and the security is
backed only by the assets and revenues of the  subdivision,  the  subdivision is
deemed the sole issuer.  Similarly, in the case of an IDB, if the bond is backed
only by the assets and revenues of a nongovernmental  user, the  nongovernmental
user would be deemed the sole issuer.  If the creating  government or some other
entity  guarantees  the security,  the guarantee  would be considered a separate
security and would be treated as an issue of the guaranteeing entity.

PORTFOLIO TRANSACTIONS

     Each Fund's assets are invested by the Manager in a manner  consistent with
the Fund's  investment  objectives,  policies,  and  restrictions,  and with any
instructions  the Board of  Trustees  may issue from time to time.  Within  this
framework,  the Manager is responsible for making all  determinations  as to the
purchase and sale of portfolio  securities and for taking all steps necessary to
implement securities transactions on behalf of the Funds.

     In placing  orders for the purchase and sale of portfolio  securities,  the
Manager  will  use its best  efforts  to  obtain  the best  possible  price  and
execution and will otherwise place orders with broker-dealers  subject to and in
accordance  with any  instructions  the Board of Trustees may issue from time to
time. The Manager will select  broker-dealers to execute portfolio  transactions
on behalf of the Funds solely on the basis of best price and execution.

     The portfolio turnover rates for each of the Variable-Price Funds appear in
the  Financial  Highlights  appearing  in the  Prospectuses.  Because  a  higher
turnover  rate  increases  transaction  costs and may increase  taxable  capital
gains,  the  Manager  carefully  weighs the  potential  benefits  of  short-term
investing against these considerations.


VALUATION OF PORTFOLIO SECURITIES

     Each Fund's net asset value per share ("NAV") is calculated as of the close
of business of the New York Stock Exchange (the "Exchange") usually at 3:00 p.m.
Central  time each day the  Exchange  is open for  business.  The  Exchange  has
designated the following  holiday  closings for 1997: New Year's Day (observed),
Presidents'  Day,  Good  Friday,  Memorial  Day,  Independence  Day,  Labor Day,
Thanksgiving,  and  Christmas  (observed).  Although  the Funds  expect the same
holiday  schedule  to be observed in the  future,  the  Exchange  may modify its
holiday schedule at any time.

     Each Fund's share price is  calculated by adding the value of all portfolio
securities and other assets,  deducting liabilities,  and dividing the result by
the number of shares  outstanding.  Expenses  and  interest  earned on portfolio
securities are accrued daily.

     MONEY MARKET FUND.  Securities  held by the Money Market Fund are valued at
amortized  cost.  This method  involves  valuing an  instrument  at its cost and
thereafter  assuming a constant  amortization  to  maturity  of any  discount or
premium paid at the time of purchase. Although this method provides certainty in
valuation,  it generally  disregards the effect of fluctuating interest rates on
an instrument's  market value.  Consequently,  the  instrument's  amortized cost
value may be higher or lower than its market value,  and this discrepancy may be
reflected in the Fund's yield.  During periods of declining  interest rates, for
example,  the daily yield on Fund  shares  computed  as  described  above may be
higher than that of a fund with  identical  investments  priced at market value.
The converse would apply in a period of rising interest rates.

     The amortized  cost valuation  method is permitted in accordance  with Rule
2a-7 under the  Investment  Company Act of 1940.  Under the Rule, a fund holding
itself out as a money  market fund must adhere to certain  quality and  maturity
criteria  which are described in the  Prospectus.  As an operating  policy,  the
Money Market Fund  maintains a  dollar-weighted  average  maturity of 60 days or
less.

     The Board of Trustees has established  procedures designed to stabilize the
Money Market  Fund's NAV at $1.00 per share to the extent  reasonably  possible.
These  procedures  require the  Trust's  Chief  Financial  Officer to notify the
Trustees  immediately if, at any time, the Money Market Fund's weighted  average
maturity  exceeds 60 days, or its NAV, as determined by using  available  market
quotations,  deviates from its amortized cost per share by .25% or more. If such
deviation exceeds .40%, a meeting of the Board of Trustees' audit committee will
be called to consider what actions,  if any,  should be taken. If such deviation
exceeds .50%, the Trust's Chief Financial  Officer is instructed to adjust daily
dividend  distributions  immediately  to the  extent  necessary  to  reduce  the
deviation  to .50% or lower and to call a meeting  of the Board of  Trustees  to
consider further action.

     Actions  the Board of  Trustees  may  consider  under  these  circumstances
include,  but are not  limited  to: (a) selling  portfolio  securities  prior to
maturity,   (b)  withholding   dividends  or  distributions  from  capital,  (c)
authorizing a one-time dividend adjustment,  (d) discounting share purchases and
initiating  redemptions in kind, or (e) valuing  portfolio  securities at market
for purposes of calculating NAV.

     VARIABLE-PRICE  FUNDS. Most securities held by the Variable-Price Funds are
priced by an independent pricing service, provided that such prices are believed
by the Manager to reflect the fair market value of portfolio securities. Because
there are  hundreds  of  thousands  of  municipal  issues  outstanding,  and the
majority of them do not trade daily, the prices provided by pricing services are
generally  determined  without  regard to bid or last sale  prices.  In  valuing
securities,  the  pricing  services  take  into  account  institutional  trading
activity,  trading in similar groups of securities, and any developments related
to  specific  securities.  The  methods  used  by the  pricing  service  and the
valuations  so  established  are  reviewed  by the  Manager  under  the  general
supervision  of the Board of  Trustees.  There are a number of pricing  services
available,  and the  Manager,  on the  basis  of  ongoing  evaluation  of  these
services,  may use other pricing  services or discontinue the use of any pricing
service in whole or in part.

     Securities  not priced by a pricing  service are valued at the mean between
the most recently  quoted bid and asked prices provided by  broker-dealers.  The
municipal bond market is typically a "dealer  market";  that is, dealers buy and
sell bonds for their own accounts  rather than for customers.  As a result,  the
spread, or difference  between bid and asked prices, for certain municipal bonds
may differ substantially among broker-dealers.

     Securities  maturing  within 60 days of the valuation date may be valued at
amortized cost, which is plus or minus any amortized discount or premium, unless
the Trustees  determine  that this would not result in fair valuation of a given
security.  Other  assets and  securities  for which  quotations  are not readily
available  are valued in good faith at their fair  market  value  using  methods
approved by the Board of Trustees.

PERFORMANCE

     The Funds may quote  performance  in various ways.  Historical  performance
information  will  be  used  in  advertising  and  sales  literature  and is not
indicative of future  results.  The Funds' share price,  yield,  and return will
vary with changing market conditions.

     For the MONEY MARKET FUND,  yield quotations are based on the change in the
value of a hypothetical investment (excluding realized gains and losses from the
sale of securities and unrealized  appreciation  and depreciation of securities)
over a  seven-day  period  (base  period)  and  stated  as a  percentage  of the
investment at the start of the base period (base-period return). The base-period
return is then  annualized by multiplying it by 365/7,  with the resulting yield
figure carried to at least the nearest hundredth of one percent.

     Calculations of effective yield begin with the same base-period return used
to  calculate  yield,  but the  return  is then  annualized  to  reflect  weekly
compounding according to the following formula:

     Effective Yield = [(Base-Period Return + 1)365/7] - 1

     For the seven-day  period ended  November 30, 1996, the Money Market Fund's
yield was 2.96%, and its effective yield was 3.01 %.

     For the VARIABLE-PRICE  FUNDS, yield quotations are based on the investment
income per share earned  during a given 30-day  period,  less  expenses  accrued
during the period (net investment income), and are computed by dividing a Fund's
net  investment  income  by its  share  price  on the  last  day of the  period,
according to the following formula:

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

where a = dividends and interest earned during the period,  b = expenses accrued
for the period (net of  reimbursements),  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.

     For the 30-day  period  ended  Novermber  30, 1996,  the  Intermediate-Term
Fund's yield was 4.08%, and the Long-Term Fund's yield was 4.70%. For the 30-day
period ended October 31, 1996, the Limited-Term Fund's yield was 3.69%

     Total  returns  quoted in  advertising  and sales  literature  reflect  all
aspects of a Fund's return,  including the effect of  reinvesting  dividends and
capital gain distributions and any change in the Fund's NAV during the period.

     Average annual total returns are  calculated by  determining  the growth or
decline in value of a hypothetical historical investment in a Fund over a stated
period and then calculating the annually  compounded  percentage rate that would
have produced the same result if the rate of growth or decline in value had been
constant  throughout the period.  For example, a cumulative total return of 100%
over 10 years would  produce an average  annual total return of 7.18%,  which is
the steady annual rate that would result in 100% growth on a compounded basis in
10 years. While average annual total returns are a convenient means of comparing
investment  alternatives,  investors should realize that a Fund's performance is
not constant  over time but changes from  year-to-year  and that average  annual
total  returns  represent  averaged  figures as  opposed to actual  year-to-year
performance.

     The  Limited-Term  Fund's average annual total returns for the one-year and
life-of-fund  period ended  October 31, 1996 are 4.26% and 4.23%,  respectively.
The inception date of the Limited-Term Fund is March 1, 1993.

     The  remaining  Funds'  average  annual  total  returns  for the  one-year,
five-year,  ten-year and  life-of-fund  periods  ended  November  30, 1996,  are
indicated in the following table.


Fund                       One Year     Five Year     Ten Year   Life of Fund*
- -----------------------------------------------------------------------------
Money Market Fund            3.00%        2.62%         3.80%        ____%
Intermediate-Term Fund       4.93%        6.51%         6.48%        ____%
Long-Term Fund               4.62%        7.94%         6.82%        ____%
- -----------------------------------------------------------------------------
*Commencement of Operations July 31, 1984.

     In addition to average annual total returns, each Fund may quote unaveraged
or  cumulative  total  returns  reflecting  the  simple  change  in  value of an
investment over a stated period. Average annual and cumulative total returns may
be quoted as a  percentage  or as a dollar  amount and may be  calculated  for a
single investment, a series of investments,  or a series of redemptions over any
time period.  Total  returns may be broken down into their  components of income
and capital  (including  capital gains and changes in share price) to illustrate
the  relationship  of these  factors and their  contributions  to total  return.
Performance  information  may be quoted  numerically  or in a table,  graph,  or
similar illustration.

     Each Fund may also quote  tax-equivalent  yields,  which  show the  taxable
yields an investor would have to earn before taxes to equal the Fund's  tax-free
yields.  As a prospective  investor in the Funds, you should  determine  whether
your  tax-equivalent  yield is  likely to be  higher  with a  taxable  or with a
tax-exempt Fund. To determine this, you may use the formula depicted below.

     You can calculate your tax-equivalent yield for a Fund (taking into account
only  federal  income  taxes  and not any  applicable  state  taxes)  using  the
following equation:

                Fund's Tax-Free Yield           Your Tax-
                ---------------------          Equivalent
              100%  - Federal Tax Rate   =       Yield
                                                                 

     The Funds' performance may be compared with the performance of other mutual
funds  tracked by mutual  fund rating  services or with other  indexes of market
performance.  This may  include  comparisons  with funds that,  unlike  American
Century funds, are sold with a sales charge or deferred sales charge. Sources of
economic  data that may be used for such  comparisons  may include,  but are not
limited to, U.S. Treasury bill, note, and bond yields, money market fund yields,
U.S.  government debt and percentage held by foreigners,  the U.S. money supply,
net  free  reserves,  and  yields  on  current-coupon  GNMAs  (source:  Board of
Governors of the Federal Reserve  System);  the federal funds and discount rates
(source:  Federal  Reserve  Bank of New York);  yield  curves for U.S.  Treasury
securities and AA/AAA-rated  corporate  securities (source:  Bloomberg Financial
Markets);  yield curves for AAA-rated  tax-free  municipal  securities  (source:
Telerate);  yield curves for foreign government  securities (sources:  Bloomberg
Financial  Markets and Data  Resources,  Inc.);  total  returns on foreign bonds
(source:  J.P.  Morgan  Securities  Inc.);  various U.S. and foreign  government
reports;  the junk bond market (source:  Data Resources,  Inc.); the CRB Futures
Index  (source:  Commodity  Index Report);  the price of gold  (sources:  London
a.m./p.m.  fixing and New York Comex Spot Price); rankings of any mutual fund or
mutual fund category tracked by Lipper Analytical Services, Inc. or Morningstar,
Inc.;   mutual  fund  rankings   published  in  major   nationally   distributed
periodicals;  data  provided  by  the  Investment  Company  Institute;  Ibbotson
Associates,  Stocks, Bonds, Bills, and Inflation;  major indexes of stock market
performance;  and  indexes and  historical  data  supplied  by major  securities
brokerage or investment advisory firms. The Funds may also utilize reprints from
newspapers  and magazines  furnished by third  parties to illustrate  historical
performance.

     The Funds'  shares are sold  without a sales  charge (or  "load").  No-load
funds  offer  an  advantage  to  investors  when  compared  to load  funds  with
comparable investment objectives and strategies.

TAXES

FEDERAL INCOME TAX

     Each Fund intends to qualify annually as a "regulated  investment  company"
under  Subchapter  M of the  Internal  Revenue  Code of 1986,  as  amended  (the
"Code").  By so  qualifying,  the Funds will not incur  federal or state  income
taxes on its net  investment  income and on net  realized  capital  gains to the
extent distributed as dividends to shareholders.

     It is intended  that each Fund's  assets will be  sufficiently  invested in
municipal securities to qualify to pay  "exempt-interest  dividends" (as defined
in the Code) to  shareholders.  A Fund's  dividends  payable from net tax-exempt
interest  earned  from  municipal  securities  will  qualify as  exempt-interest
dividends  if, at the close of each quarter of its taxable year, at least 50% of
the value of its total assets consists of municipal securities.  Exempt-interest
dividends  distributed to shareholders are not included in  shareholders'  gross
income for purposes of the regular  federal income tax. The percentage of income
that is tax-exempt is applied  uniformly to all  distributions  made during each
calendar  year.  This  percentage  may  differ  from the  actual  percentage  of
tax-exempt income received during any particular month.

     Each  Fund  will  determine   periodically  which   distributions  will  be
designated  as  exempt-interest  dividends.  If a Fund earns income which is not
eligible to be designated as exempt-interest  dividends,  the Fund, nonetheless,
intends to distribute such income.

     Such distributions  will be subject to federal,  state, and local taxes, as
applicable, in the hands of shareholders.

     Distributions  of net investment  income received by a Fund from investment
in debt  securities  other  than  municipal  securities  and  any  net  realized
short-term capital gains distributed by the Fund will be taxable to shareholders
as  ordinary  income.  Because  the Funds'  investment  income is  derived  from
interest rather than dividends, no portion of such distributions is eligible for
the dividends-received deduction available to corporations.

     The timing of your investment could have undesirable tax  consequences.  If
you open an account or buy shares for your account  before the day a dividend or
distribution  is declared,  you may receive a portion of your investment back as
taxable  income  if that  dividend  or  distribution  is not an  exempt-interest
dividend.

     Under the Code,  any  distribution  from a fund's  net  realized  long-term
capital gains is taxable to shareholders as a long-term capital gain, regardless
of the length of time shares have been held.

     As of May 31,  1996,  the  Intermediate-Term  Fund and  Long-Term  Fund had
capital  loss  carryovers  of $420,126  and  $427,920,  respectively.  No future
capital gain  distributions will be made by either Fund until the loss carryover
has been offset or has expired. For the Intermediate-Term Fund, the capital loss
carryovers  of  $382,614  and  $37,512  expire  May 31,  2003 and May 31,  2004,
respectively.  For the Long-Term  Fund, the capital loss  carryovers of $330,926
and $96,994 expire May 31, 2003 and May 31, 2004, respectively.

     The  Funds  intend  to  comply  with  tax  rules  applicable  to  regulated
investment  companies,  including a requirement that capital gains from the sale
of securities  held less than three months  constitute less than 30% of a Fund's
gross income for each fiscal year.  Gains on some futures  contracts and options
are included in this 30%  calculation,  which may limit the  investments in such
instruments.

     Upon the sale or exchange of a Fund's shares, a shareholder  generally will
realize a taxable gain or loss depending upon his/her basis in the shares.  Such
gain or loss will be treated as a capital gain or loss if the shares are capital
assets in the  shareholder's  hands and will be long-term  if the  shareholder's
holding  period  for the  shares  is more  than one year  and,  generally,  will
otherwise be short-term.

     Any loss realized from a disposition  of Fund shares held for six months or
less will be  disallowed  to the extent that  dividends  from the Fund have been
designated as exempt-interest dividends. Any loss realized on a sale or exchange
of Fund shares also will be disallowed to the extent that the shares disposed of
are replaced (including replacement through reinvesting of dividends and capital
gain  distributions  in the Fund)  within a period of 61 days  beginning 30 days
before and ending 30 days after the  disposition of the shares.  In such a case,
the basis of the shares  acquired  will be adjusted  to reflect  the  disallowed
loss.

     Interest on certain  types of  industrial  development  bonds is subject to
federal income tax when received by  "substantial  users" or persons  related to
substantial users as defined in the Code. The term  "substantial  user" includes
any  "nonexempt  person"  who  regularly  uses in  trade or  business  part of a
facility financed from the proceeds of industrial  development  bonds. The Funds
may invest periodically in industrial development bonds and, therefore,  may not
be appropriate investments for entities that are substantial users of facilities
financed by industrial  development  bonds or "related  persons" of  substantial
users.  Generally,  an individual  will not be a related person of a substantial
user under the Code unless he/she or his/her immediate family (spouse, brothers,
sisters,  and lineal  descendants) owns directly or indirectly in aggregate more
than 50% of the equity value of the substantial user.

     Opinions  relating to the tax status of interest  derived  from  individual
municipal  securities are rendered by bond counsel to the issuer. The Funds, the
investment  manager,  and the  Funds'  counsel  do not  review  the  proceedings
relating to the issuance of state or municipal  securities  on the basis of bond
counsel opinions.

     From time to time,  proposals  have been  introduced  in  Congress  for the
purpose of  restricting  or  eliminating  the federal  income tax  exemption for
interest on municipal securities, and similar proposals may be introduced in the
future.  If  such  a  proposal  were  enacted,  the  availability  of  municipal
securities  for  investment  by the Funds and the Funds' NAVs would be adversely
affected. Under these circumstances, the Board of Trustees would re-evaluate the
Funds'  investment  objectives and policies and would consider either changes in
the structure of the Trust or its dissolution.

     The information  above is only a summary of some of the tax  considerations
affecting the Funds and their shareholders.  No attempt has been made to discuss
individual  tax  consequences.  To  determine  whether  a  Fund  is  a  suitable
investment  based on his or her  situation,  a prospective  investor may wish to
consult a tax advisor.

ALTERNATIVE MINIMUM TAX

     While the  interest on bonds  issued to finance  essential  state and local
government operations is generally tax-exempt,  interest on certain nonessential
or private activity securities issued after August 7, 1986, while tax-exempt for
regular  federal  income tax  purposes,  constitutes a  tax-preference  item for
taxpayers in determining  alternative  minimum tax liability  under the Code and
income tax  provisions  of several  states.  The  interest  on private  activity
securities  could subject a shareholder  to, or increase  liability  under,  the
federal alternative minimum tax, depending on the shareholder's tax situation.

     All distributions  derived from interest exempt from regular federal income
tax may subject  corporate  shareholders  to, or increase their liability under,
the  alternative  minimum tax because  these  distributions  are included in the
corporation's adjusted current earnings.

     The Trust will  inform  shareholders  annually  as to the dollar  amount of
distributions derived from interest payments on private activity securities.

ABOUT THE TRUST

     American  Century  Municipal  Trust (the "Trust") is a registered  open-end
management  investment  company that was organized as a  Massachusetts  business
trust on May 1, 1984 (the Trust was formerly known as "Benham  Municipal  Trust"
and "Benham National Tax-Free Trust").  Currently,  there are nine series of the
Trust.  American  Century-Benham  Tax-Free Money Market Fund (formerly  known as
"Benham  National   Tax-Free  Money  Market  Fund"),   American   Century-Benham
Intermediate-Term  Tax-Free Fund (formerly  known as "Benham  National  Tax-Free
Intermediate-Term Fund"), American Century-Benham Limited-Term Tax-Free Fund and
American  Century-Benham  Long-Term  Tax-Free  Fund  (formerly  known as "Benham
National Tax-Free Long-Term Fund") are described in this Statement of Additional
Information.  The Board of Trustees  may create  additional  series from time to
time.

     The  Declaration  of  Trust  permits  the  Board  of  Trustees  to issue an
unlimited  number of full and fractional  shares of beneficial  interest without
par value,  which may be issued in series (funds).  Shares issued are fully paid
and nonassessable and have no preemptive, conversion, or similar rights.

     Each series votes separately on matters affecting that series  exclusively.
Voting rights are not cumulative, so that investors holding more than 50% of the
Trust's (i.e.,  all series')  outstanding  shares may elect a Board of Trustees.
The Trust instituted  dollar-based voting,  meaning that the number of votes you
are entitled to is based upon the dollar amount of your investment. The election
of Trustees is  determined  by the votes  received  from all Trust  shareholders
without regard to whether a majority of  shareholders of any one series voted in
favor of a particular  nominee or all nominees as a group.  Each shareholder has
equal rights to dividends and distributions  declared by the Fund and to the net
assets of such Fund upon its liquidation or dissolution  proportionate to his or
her share  ownership  interest  in the Fund.  Shares of each  series  have equal
voting rights,  although each series votes separately on matters  affecting that
series exclusively.

     Shareholders  of  a  Massachusetts  business  trust  could,  under  certain
circumstances,  be held  personally  liable for its  obligations.  However,  the
Declaration of Trust contains an express disclaimer of shareholder liability for
acts or  obligations  of the Trust.  The  Declaration of Trust also provides for
indemnification and reimbursement of expenses of any shareholder held personally
liable for obligations of the Trust.  The Declaration of Trust provides that the
Trust  will,  upon  request,  assume the  defense of any claim made  against any
shareholder  for any act or  obligation  of the Trust and satisfy  any  judgment
thereon.  The Declaration of Trust further  provides that the Trust may maintain
appropriate insurance (for example, fidelity,  bonding, and errors and omissions
insurance)  for  the  protection  of  the  Trust,  its  shareholders,  Trustees,
officers,  employees,  and agents to cover possible tort and other  liabilities.
Thus,  the  risk  of a  shareholder  incurring  financial  loss as a  result  of
shareholder  liability  is limited  to  circumstances  in which both  inadequate
insurance exists and the Trust itself is unable to meet its obligations.

     CUSTODIAN BANK: Chase Manhattan Bank, 4 Chase Metrotech  Center,  Brooklyn,
New York 11245 and Commerce Bank, N.A., 1000 Walnut, Kansas City, Missouri 64106
serve as custodians of the Trust's  assets.  Services  provided by the custodian
banks include (a) settling  portfolio  purchases and sales, (b) reporting failed
trades,  (c)  identifying  and collecting  portfolio  income,  and (d) providing
safekeeping of securities. The custodian takes no part in determining the Funds'
investment  policies or in determining which securities are sold or purchased by
the Fund.

     INDEPENDENT  AUDITORS:  KPMG Peat  Marwick LLP,  1000  Walnut,  Suite 1600,
Kansas  City,  Missouri  64106,  serve as the Trust's  independent  auditors and
provides services including the audit of the annual financial statements.

TRUSTEES AND OFFICERS

     The Trust's  activities are overseen by a Board of Trustees,  including six
independent Trustees.  The individuals listed below whose names are marked by an
asterisk (*) are "interested persons" of the Trust (as defined in the Investment
Company Act of 1940) by virtue of, among other considerations, their affiliation
with  either  the Trust;  the  Trust's  investment  advisor,  Benham  Management
Corporation or American Century Investment Management,  Inc. with respect to the
Limited-Term Fund; the Trust's agent for transfer and  administrative  services,
American Century Services  Corporation  (ACS); the Trust's  distribution  agent,
American Century Investment  Services,  Inc. (ACIS);  their parent  corporation,
American Century  Companies,  Inc. (ACC) or ACC's  subsidiaries;  or other funds
advised by the Manager.  Each Trustee listed below serves as Trustee or Director
of other  funds  advised  by the  Manager.  Unless  otherwise  noted,  a date in
parentheses  indicates  the date the Trustee or officer began his or her service
in a  particular  capacity.  The  Trustees'  and  officers'  address,  with  the
exception of Mr. Stowers III and Ms. Roepke,  is 1665 Charleston Road,  Mountain
View,  California  94043.  The address of Mr. Stowers III and Ms. Ropeke is 4500
Main Street, Kansas City, Missouri 64111.

TRUSTEES

     *JAMES M. BENHAM,  Chairman of the Board of Trustees (1985),  President and
Chief  Executive  Officer  (1996).  Mr. Benham is also President and Chairman of
the Board of the Manager  (1971),  and a member of the Board of Governors of the
Investment  Company  Institute  (1988).  Mr.  Benham has been in the  securities
business  since 1963, and he frequently  comments  through the media on economic
conditions, investment strategies, and the securities markets.

     ALBERT A.  EISENSTAT,  independent  Trustee  (1995).  Mr.  Eisenstat  is an
independent  Director of each of  Commercial  Metals Co.  (1982),  Sungard  Data
Systems (1991) and Business  Objects S/A (1994).  Previously,  he served as Vice
President of Corporate  Development  and Corporate  Secretary of Apple  Computer
and served on its Board of Directors (1985 to 1993).

     RONALD J. GILSON,  independent Trustee (1995);  Charles J. Meyers Professor
of Law and  Business  at Stanford  Law School  (1979) and the Mark and Eva Stern
Professor  of Law and  Business  at  Columbia  University  School of Law (1992);
counsel to Marron, Reid & Sheehy (a San Francisco law firm, 1984).

     MYRON S. SCHOLES,  independent  Trustee (1985).  Mr. Scholes is a principal
of Long-Term  Capital  Management  (1993). He is also Frank E. Buck Professor of
Finance at the  Stanford  Graduate  School of Business  (1983) and a Director of
Dimensional  Fund Advisors  (1982) and the Smith Breeden Family of Funds (1992).
From August 1991 to June 1993,  Mr.  Scholes was a Managing  Director of Salomon
Brothers Inc. (securities brokerage).

     KENNETH  E.  SCOTT,  independent  Trustee  (1985).  Mr.  Scott  is Ralph M.
Parsons  Professor  of Law and  Business  at  Stanford  Law School  (1972) and a
Director of RCM Capital Funds, Inc. (1994).

     ISAAC STEIN,  independent  Trustee (1992).  Mr. Stein is former Chairman of
the Board (1990 to 1992) and Chief Executive Officer (1991 to 1992) of Esprit de
Corp.  (clothing  manufacturer).  He  is  a  member  of  the  Board  of  Raychem
Corporation (electrical equipment, 1993), President of Waverley Associates, Inc.
(private   investment   firm,   1983),   and  a  Director  of  ALZA  Corporation
(pharmaceuticals,  1987). He is also a Trustee of Stanford University (1994) and
Chairman of Stanford Health Services (hospital, 1994).

     *JAMES E. STOWERS III, Trustee (1995).  Mr Stowers III is President,  Chief
Executive Officer and Director of ACC, ACS and ACIS.

     JEANNE D. WOHLERS,  independent  Trustee  (1985).  Ms. Wohlers is a private
investor  and an  independent  Director  and Partner of Windy Hill  Productions,
LP.  Previously,  she served as Vice  President and Chief  Financial  Officer of
Sybase, Inc. (software company, 1988 to 1992).

OFFICERS

     *JAMES M. BENHAM, President and Chief Executive Officer (1996).

     *WILLIAM  M.  LYONS,  Executive  Vice  President  (1996);   Executive  Vice
President,  Chief  Operating  Officer,  General  Counsel  and  Secretary  of the
Manager, ACS, and ACIS.

     *DOUGLAS A. PAUL,  Secretary  (1988),  Vice President  (1990),  and General
Counsel  (1990);  Secretary  and Vice  President  of the  funds  advised  by the
Manager.

     *C. JEAN WADE, Controller (1996).

     *MARYANNE ROEPKE,  CPA, Chief Financial Officer and Treasurer (1995);  Vice
President and Assistant Treasurer of ACS.

     For the fiscal year ended,  October 31, 1996 the table below  indicates the
amounts that the Limited-Term Fund paid its Directors as an investment portfolio
in  American  Century  Mutual  Funds,  Inc.,  (the   "corporation")   registered
investment company.

                                     Aggregate         Total Compensation from
                                   Compensation         the American Century
     Director                  from the corporation1      Family of Funds2
================================================================================
     Thomas A. Brown                $40,880.74                $45,000
     Robert W. Doering, MD.          38,046.00                 41,500
     Linsley L. Lundgaard            41,179.13                 45,000
     Donald H. Pratt                 39,388.80                 43,333
     Lloyd T. Silver Jr.             39,388.80                 43,300
     M. Jeannine Strandjord          39,388.80                 42,500
     John M. Urie3                   41,179.13                 37,167
     Del Hock3                           0                      7,500
================================================================================

1    Includes  compensation actually paid by American Century Mutual Funds, Inc.
     during the fiscal year ended October 31, 1996.

2    Includes compensation paid by the fifteen investment company members of the
     American  Century  family of funds for the calendar year ended December 31,
     1996.

3    Del Hock replaced Jack Urie as an independent  director  effective  October
     31, 1996.

     The table on the next page summarizes the compensation that the Trustees of
the Funds (with the exception of the Limited-Term  Fund) received for the Funds'
fiscal year ended May 31, 1996, as well as the compensation received for serving
as a  Director  or  Trustee  of all other  funds  advised  by Benham  Management
Corporation.

     As of February 28, 1997,  the Trust's  Officer's and Trustees,  as a group,
owned less than 1% of each Fund's total shares outstanding.


<TABLE>
<CAPTION>

TRUSTEE COMPENSATION FOR THE FISCAL YEAR ENDED MAY 31, 1996

                             Aggregate             Pension or Retirement            Estimated             Total Compensation
     Name of               Compensation           Benefits Accrued As Part       Annual Benefits          From Fund and Fund
     Trustee*             From The Fund               of Fund Expenses           Upon Retirement      Complex** Paid to Trustees
- --------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                         <C>                         <C>                           <C>    
Albert Eisenstat        $ 78 (Money Market)            Not Applicable            Not Applicable                 $47,750
                          56 (Intermediate-Term)
                          47 (Long-Term)

Ronald J. Gilson        $473 (Money Market)            Not Applicable            Not Applicable                 $97,333
                         432 (Intermediate-Term)
                         412 (Long-Term)

Myron S. Scholes        $479 (Money Market)            Not Applicable            Not Applicable                 $69,750
                         435 (Intermediate-Term)
                         414 (Long-Term)

Kenneth E. Scott        $543 (Money Market)            Not Applicable            Not Applicable                 $78,273
                         480 (Intermediate-Term)
                         452 (Long-Term)

Ezra Solomon            $575 (Money Market)            Not Applicable            Not Applicable                 $68,499
                         458 (Intermediate-Term)
                         414 (Long-Term)

Isaac Stein             $486 (Money Market)            Not Applicable            Not Applicable                 $71,500
                         441 (Intermediate-Term)
                         420 (Long-Term)

Jeanne D. Wohlers       $504 (Money Market)            Not Applicable            Not Applicable                 $73,750
                         453 (Intermediate-Term)
                         429 (Long-Term)
- --------------------------------------------------------------------------------------------------------------------------------
*    Interested Trustees receive no compensation for their services as such.
**   American Century family of funds includes nearly 70 no-load mutual funds.
</TABLE>


INVESTMENT ADVISORY SERVICES

     Each Fund with the  exception of the  Limited-Term  Fund has an  investment
advisory  agreement with Benham Management  Corporation dated June 1, 1995, that
was approved by  shareholders  on May 31,  1995.  The  Limited-Term  Fund has an
investment  management  agreement with American  Century  Investment  Management
Inc., (ACIM) dated ______, 1997.

     Benham  Management  Corporation  is a California  corporation  and became a
wholly owned subsidiary of ACC on June 1, 1995.  Benham  Management  Corporation
has  served  as  investment  advisor  to the  Funds  with the  exception  of the
Limited-Term  Fund since each Fund's  inception.  ACC is a holding  company that
owns all of the stock of the  operating  companies  that provide the  investment
management,  transfer agency,  shareholder  service,  and other services for the
American  Century funds.  James E. Stowers,  Jr.,  controls ACC by virtue of his
ownership of a majority of its common stock.  Benham Management  Corporation has
been a registered investment advisor since 1971.

     Each Fund's  agreement with the Manager  continues for an initial period of
two years and thereafter from year to year provided that,  after the initial two
year  period,  it is  approved  at least  annually  by vote of a majority of the
Fund's shareholders or by vote of a majority of the Funds' Trustees, including a
majority  of  those  Trustees  who are  neither  parties  to the  agreement  nor
interested persons of any such party, cast in person at a meeting called for the
purpose of voting on such approval.

     Each  investment  agreement is terminable  on sixty days'  written  notice,
either  by the  Fund or by the  Manager,  to the  other  party,  and  terminates
automatically in the event of its assignment.

     Pursuant to the investment  agreements,  the Manage provides the Funds with
investment  advice and portfolio  management  services in  accordance  with each
Fund's investment objectives, policies, and restrictions. The Manager determines
what  securities  will be purchased and sold by the Funds and assist the Trust's
officers in carrying out decisions made by the Board of Trustees.

     For these services, each Fund (with the exception of the Limited-Term Fund)
pays the Manager a monthly investment  advisory fee based on a percentage of the
Trust's  average  daily net  assets to the  following  investment  advisory  fee
schedule:

     .50% of the first $100 million;  
     .45% of the next $100 million; 
     .40% of the next $100 million;  
     .35% of the next $100 million;  
     .30% of the next $100 million;  
     .25% of the next $1 billion; 
     .24% of the next $1 billion; 
     .23% of the next $1 billion;  
     .22% of the next $1 billion;  
     .21% of the next $1 billion; 
     .20% of the next $1 billion; and
     .19% of average daily net assets over $6.5 billion.

     The Manager of the  Limited-Term  Fund pays all the Fund's  expenses except
brokerage,  taxes,  interest,  fees and  expenses of the  non-interested  person
Trustees (including counsel fees) and extraordinary expenses.

         For  the  services  provided  to the  Limited-Term  Fund,  the  Manager
receives  an annual fee which is  computed at 0.55% of average net assets of the
Fund.  The rate at which  this  fee is  assessed  is  determined  annually  in a
two-step process:  First, a fee rate schedule is applied to the assets of all of
the bond funds managed by the Manager (the "Investment Category Fee"). Second, a
separate  fee rate  schedule is applied to the assets of all of the mutual funds
managed by the Manager (the "Complex Fee"). The Investment  Category Fee and the
Complex  Fee  are  then  added  to  determine  the  annual  fee  payable  by the
Limited-Term  Fund to the Manager.  For the current  fiscal year, the Investment
Category  Fee is 0.25% of  average  net  assets of the  Limited-Term  Fund.  The
Complex  Fee is 0.30% of the average net assets of the  Limited-Term  Fund.  The
computation of these fees is described below.

Calculation of the Investment Category Fee

     The Investment Category Fee is calculated based the following schedule:

         Investment Category Fee Schedule  (Limited-Term Fund) 
       Investment Category Assets Under Management     Fee Rate 
                    First $1 billion                   0.3100% 
                    Next $1 billion                    0.2580% 
                    Next $3 billion                    0.2280% 
                    Next $5 billion                    0.2080% 
                    Next $15 billion                   0.1950% 
                    Next $25 billion                   0.1930% 
                    Assets greater than $50 billion    0.1925%

     The  calculation  of the  Investment  Category Fee is based on applying the
schedule  above to the  assets of the funds  managed by the  Manager  within its
Investment Category.  There are three Investment Categories:  Bond Funds, Equity
Funds and Money Market Funds.  The funds included within an Investment  Category
are  all of the  open-end  investment  companies  managed  by  the  Manager  and
distributed by American Century  Investment  Services,  Inc. Private label funds
and  non-investment  company  clients  are  excluded  from  the  asset  base for
calculation of the fees for the funds.

     To calculate a particular  fund's fee, the fund's  Investment  Category Fee
schedule is applied to the total  assets  within the  Investment  Category.  The
fund's fee is its pro rata share of the resulting fee.


Calculation of the Complex Fee

         The Complex Fee is calculated based on the following schedule:

          Complex Assets Under Management              Fee Rate

               First $2.5 billion                      0.3100% 
               Next $7.5 billion                       0.3000% 
               Next $15.0 billion                      0.2985%
               Next $25.0 billion                      0.2970% 
               Next $50.0 billion                      0.2960% 
               Next $100.0 billion                     0.2950% 
               Next $100.0 billion                     0.2940% 
               Next $200.0 billion                     0.2930%  
               Next $250.0 billion                     0.2920%  
               Next $500.0 billion                     0.2910% 
               Assets greater than $1,250.0 billion    0.2900%

     The  calculation  of the  Investment  Category Fee is based on applying the
schedule  above to the assets of all of the funds  managed by the Manager in the
three Fund Type  categories.  To calculate a particular  fund's Complex Fee, the
Complex Fee schedule is applied to the total complex  assets.  The fund's fee is
its pro rata share of the resulting fee.

     On the first  business  day of each  month,  the  Limited-Term  Fund pays a
management  fee to the Manager for the previous  month at the  specified  annual
rate. The fee for the previous month is calculated by multiplying the applicable
fee for the  Limited-Term  Fund by the aggregate  average daily closing value of
the Fund's net assets during the previous month by a fraction,  the numerator of
which is the number of days in the previous  month and the  denominator of which
is 365 (366 in leap years).

     Investment  advisory fees paid by each of the remaining  Funds in the Trust
to the Manager for the fiscal  periods  ended May 31, 1996,  1995,  and 1994 are
indicated in the following table.

Fee amounts are net of amounts  reimbursed  or recouped as  described  under the
section titled "Expense Limitation Agreement."

                Investment Advisory Fees (net of reimbursements)
- -----------------------------------------------------------------------------
                              Fiscal            Fiscal            Fiscal
Fund                           1996              1995              1994
- -----------------------------------------------------------------------------
Money Market Fund            $331,599          $367,683          $397,311
Intermediate-Term Fund        262,048           234,926           275,656
Long-Term Fund                197,247           165,409           218,160
- -----------------------------------------------------------------------------

TRANSFER AND ADMINISTRATIVE SERVICES

     American  Century  Services  Corporation,  4500 Main  Street,  Kansas City,
Missouri,  64111, (ACS) acts as transfer,  administrative  services and dividend
paying agent for the Funds. ACS provides facilities,  equipment and personnel to
the Funds and is paid for such  services by the Funds with the  exception of the
Limited-Term  Fund.  For the  Limited-Term  Fund,  the  Manager  pays  for  such
services. For administrative  services, each Fund (except the Limited-Term Fund)
pays ACS a monthly fee equal to its pro rata share of the dollar amount  derived
from  applying the average  daily net assets of all of the Funds  advised by the
Manager to the following administrative fee rate schedule:

Group Assets                     Administrative Fee Rate
- -----------------------------------------------------------------------------
up to $4.5 billion                         .11%
up to $6 billion                           .10
up to $9 billion                           .09
over $9 billion                            .08
- -----------------------------------------------------------------------------

     For transfer agent services,  each Fund (except the Limited-Term Fund) pays
ACS a monthly fee of $1.3958 for each shareholder  account  maintained and $1.35
for each shareholder transaction executed during the month.

     Administrative  service and  transfer  agent fees paid by each Fund (except
for the  Limited-Term  Fund) for the fiscal years ended May 31, 1996,  1995, and
1994,  are  indicated  in  the  following   tables.   Fee  amounts  are  net  of
reimbursements  as  described  under  the  section  titled  "Expense  Limitation
Agreement."

                              Administrative Fees
- -----------------------------------------------------------------------------
                              Fiscal            Fiscal            Fiscal
Fund                           1996              1995              1994
- -----------------------------------------------------------------------------
Money Market Fund             $88,675          $103,791          $104,485
Intermediate-Term Fund         61,997            65,398            73,292
Long-Term Fund                 49,774            49,352            59,711
- -----------------------------------------------------------------------------
                              Transfer Agent Fees
- -----------------------------------------------------------------------------
                              Fiscal            Fiscal            Fiscal
Fund                           1996              1995              1994
- -----------------------------------------------------------------------------
Money Market Fund             $66,117           $65,409           $79,424
Intermediate-Term Fund         45,624            51,377            54,899
Long-Term Fund                 41,782            43,687            46,314
- -----------------------------------------------------------------------------

DISTRIBUTION OF FUND SHARES

     The Funds' shares are distributed by American Century Investment  Services,
Inc. (the  "Distributor"),  a registered  broker-dealer  and an affiliate of the
Manager. The Manager pays all expenses for promoting and distributing the Funds'
shares offered by this Prospectus. The Funds do not pay any commissions or other
fees  to  the   Distributor  or  to  any  other   broker-dealers   or  financial
intermediaries in connection with the distribution of Fund shares.

DIRECT FUND EXPENSES

     Each Fund  (with the  exception  of the  Limited-Term  Fund)  pays  certain
operating  expenses  that are not assumed by the Manager or ACS.  These  include
fees and expenses of the independent Trustees; custodian, audit, tax preparation
and pricing fees; fees of outside counsel and counsel  employed  directly by the
Trust;  costs of printing and mailing  prospectuses,  statements  of  additional
information,   proxy  statements,   notices,   confirmations,   and  reports  to
shareholders;  fees for  registering  the Fund's  shares under federal and state
securities laws;  brokerage fees and commissions;  trade association dues; costs
of fidelity  and  liability  insurance  policies  covering  the Fund;  costs for
incoming WATS lines maintained to receive and handle shareholder inquiries;  and
organizational  costs.  The Manager pays all expenses of the  Limited-Term  Fund
except  brokerage,  taxes,  interest,  fees and  expenses of the  non-interested
person Trustees (including counsel fees) and extraordinary expenses.

EXPENSE LIMITATION AGREEMENT

     The  Manager may recover  amounts  (representing  expenses in excess of the
contractual   limit)   reimbursed  to  the  Funds  with  the  exception  of  the
Limited-Term Fund during the preceding 11 months if, and to the extent that, for
any given month, a Funds'  expenses were less than the lower of the  contractual
or voluntary  expense limit in effect at that time. The expense limit is subject
to annual  renewal.  The Manager  has agreed to limit each Fund's  expenses to a
specified  percentage  of average daily net assets until May 31, 1997, as listed
below.

                                  1997                      1996
Fund                          Expense Limit             Expense Limit
- -----------------------------------------------------------------------------
Money Market Fund                 .67%                      .64%
Intermediate-Term Fund            .67%                      .69%
Long-Term Fund                    .67%                      .69%
- -----------------------------------------------------------------------------

     Net  expense  limitations/recoupments  for the fiscal  years  ended May 31,
1996, 1995, and 1994 are indicated in the table that follows.

                     Net Expense Limitations (Recoupments)
- -----------------------------------------------------------------------------
                              Fiscal            Fiscal            Fiscal
Fund                           1996              1995              1994
- -----------------------------------------------------------------------------
Money Market
Fund                          $76,481           $88,328           $93,387

Intermediate-
Term Fund                      23,199           69,263            68,582

Long-Term Fund                 31,698           64,101            62,290
- -----------------------------------------------------------------------------

ADDITIONAL PURCHASE AND REDEMPTION INFORMATION

     The  Funds'  shares are  continuously  offered  at net asset  value.  Share
certificates  are  issued  (without  charge)  only when  requested  in  writing.
Certificates  are not issued for fractional  shares.  Dividend and voting rights
are not affected by the issuance of certificates.

     American Century may reject or limit the amount of an investment to prevent
any one shareholder or affiliated group from controlling the Trust or one of its
series;  to avoid  jeopardizing  a  series'  tax  status;  or  whenever,  in the
Manager's opinion, such rejection is in the Trust's or a series' best interest.

     As of February 28, 1997,  to the knowledge of the Trust,  the  shareholders
listed in the chart below were record  holders of 5% or more of the  outstanding
shares of the individual Funds.

FUND                                        MONEY MARKET FUND
- -----------------------------------------------------------------------------
                                            Ellen Haebler Skove
Shareholder Name and                        48 Card Sound Road
Address                                     Key Largo, FL 33037
- -----------------------------------------------------------------------------
# of Shares Held                            4,813,318
- -----------------------------------------------------------------------------
% of Total Shares
Outstanding                                 5.5%
- -----------------------------------------------------------------------------

FUND                                        INTERMEDIATE-TERM FUND
- -----------------------------------------------------------------------------
                                            Charles Schwab & Co.
Shareholder Name and                        101 Montgomery Street
Address                                     San Francisco, CA 94101
- -----------------------------------------------------------------------------
# of Shares Held                            737,838
- -----------------------------------------------------------------------------
% of Total Shares
Outstanding                                 12.9%
- -----------------------------------------------------------------------------

FUND                                        LONG-TERM FUND
- -----------------------------------------------------------------------------
                                            Charles Schwab & Co.
Shareholder Name and                        101 Montgomery Street
Address                                     San Francisco, CA 94101
- -----------------------------------------------------------------------------
# of Shares Held                            730,055
- -----------------------------------------------------------------------------
% of Total Shares
Outstanding                                 15.5%

     ACS charges  neither fees nor  commissions on the purchase and sale of Fund
shares.  However,  ACS may  charge  fees for  special  services  requested  by a
shareholder or necessitated by acts or omissions of a shareholder.  For example,
ACS may charge a fee for processing dishonored investment checks or stop-payment
requests. See the Investor Services Guide for more information.

     Pursuant to Rule 18f-1 under the Investment  Company Act of 1940, the Trust
has elected to pay in cash all requests for  redemption  by any  shareholder  of
record,  limited in amount with  respect to each  shareholder  during any 90-day
period to the  lesser of  $250,000  or 1% of the net assets of the Fund in which
shares are held at the beginning of such period.  This  election is  irrevocable
without the prior  approval of the  Securities  and  Exchange  Commission.  With
respect to redemption requests in excess of the above limit, it is the intention
of the Trust to make payments in cash,  although the Trustees  reserve the right
to make payments in whole or in part in securities under emergency circumstances
or when payment in cash would impair the liquidity of a Fund to the detriment of
shareholders.  In this event,  the securities would be valued in the same manner
applied in valuing  the  Funds'  assets for  purposes  of  calculating  NAV.  An
investor may incur brokerage costs upon the sale of such securities.


OTHER INFORMATION

     For further information,  refer to registration  statements and exhibits on
file with the SEC in Washington,  DC. These documents are available upon payment
of a  reproduction  fee.  Statements in the  Prospectus and in this Statement of
Additional  Information concerning the contents of contracts or other documents,
copies  of which  are  filed as  exhibits  to the  registration  statement,  are
qualified by reference to such contracts or documents.

MUNICIPAL SECURITIES RATINGS

     Securities  rating  descriptions  provided under this heading are excerpted
from  publications  of Moody's  Investors  Service,  Inc.  and Standard & Poor's
Corporation.

DESCRIPTION OF MOODY'S INVESTORS SERVICE, INC.'S
MUNICIPAL BOND RATINGS:

     Aaa: Bonds that are rated "Aaa" are judged to be of the best quality.  They
carry the smallest  degree of investment  risk and are generally  referred to as
"gilt edge." Interest payments are protected by a large or exceptionally  stable
margin,  and  principal  is secure.  While the various  protective  elements are
likely to change,  such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues.

     Aa:  Bonds  that are rated  "Aa" are  judged to be of high  quality  by all
standards. Together with the Aaa group, they constitute what are generally known
as high-grade bonds. They are rated lower than the best bonds because margins of
protection  may  not  be as  large  as in  Aaa  securities,  or  fluctuation  of
protective elements may be of greater amplitude,  or there may be other elements
present that make long-term risks appear somewhat larger than in Aaa securities.

     A: Bonds that are rated "A" possess many  favorable  investment  attributes
and are to be  considered  as upper  medium-grade  obligations.  Factors  giving
security to principal and interest are considered adequate,  but elements may be
present that suggest a susceptibility to impairment sometime in the future.

     Baa:  Bonds that are rated "Baa" are considered  medium-grade  obligations,
i.e., they are neither highly  protected nor poorly secured.  Interest  payments
and principal  security appear adequate for the present,  but certain protective
elements may be lacking or may be  characteristically  unreliable over any great
length of time. Such bonds lack outstanding  investment  characteristics and, in
fact, have speculative characteristics as well.

     Ba:  Bonds  that are rated "Ba" are  judged to have  speculative  elements;
their future  cannot be  considered  as well  assured.  Often the  protection of
interest  and  principal  payments  may be very  moderate  and  thereby not well
safeguarded  during  both  good and bad  times  in the  future.  Uncertainty  of
position characterizes bonds in this class.

     B: Bonds that are rated "B" generally lack  characteristics  of a desirable
investment.  Assurance of interest and principal  payments or of  maintenance of
other terms of the contract over any long period of time may be limited.

     Caa:  Bonds that are rated "Caa" are of poor  standing.  Such issues may be
in  default,  or there  may be  elements  of  danger  present  with  respect  to
principal or interest.

     Ca: Bonds that are rated "Ca" represent  obligations  that are  speculative
to a high  degree.  Such  issues  are  often in  default  or have  other  marked
shortcomings.

     C: Bonds that are rated "C" are the lowest-rated class of bonds, and issues
so rated can be regarded as having  extremely  poor  prospects of ever attaining
any real investment standing.

     Note:  Moody's may apply the numerical  modifier "1" for municipally backed
bonds and modifiers "1," "2," and "3" for corporate-backed  municipal bonds. The
modifier "1" indicates  that the security ranks in the higher end of its generic
rating  category;  the  modifier  "2"  indicates  a mid-range  ranking,  and the
modifier  "3"  indicates  that the issue  ranks in the lower end of its  generic
rating category.

DESCRIPTION  OF  MOODY'S  INVESTORS   SERVICE,   INC.'S  RATINGS  OF  NOTES  AND
VARIABLE-RATE DEMAND OBLIGATIONS:

     Moody's  ratings  for  state  and  municipal  short-term   obligations  are
designated   Moody's  Investment  Grade  or  MIG.  Such  ratings  recognize  the
differences between short-term credit and long-term risk.  Short-term ratings on
issues   with   demand   features   (variable-rate   demand   obligations)   are
differentiated by the use of the VMIG symbol to reflect such  characteristics as
payment upon periodic  demand rather than on fixed  maturity  dates and payments
relying on external liquidity.

     MIG  1/VMIG 1:  This  designation  denotes  best  quality.  There is strong
protection present through  established cash flows,  superior liquidity support,
or demonstrated broad-based access to the market for refinancing.

     MIG 2/VMIG 2: This denotes high quality.  Margins of protection  are ample,
although not as large as in the preceding group.

DESCRIPTION OF MOODY'S INVESTORS SERVICE, INC.'S
TAX-EXEMPT COMMERCIAL PAPER RATINGS:

     Moody's  commercial paper ratings are opinions of the ability of issuers to
punctually repay those promissory obligations that have an original maturity not
exceeding nine months. Moody's makes no representation that such obligations are
exempt from registration under the Securities Act of 1933, nor does it represent
that any  specific  note is a valid  obligation  of a rated  issuer or issued in
conformity with any applicable law. The following designations, all judged to be
investment  grade,  indicate the relative  repayment ability of rated issuers of
securities in which the Funds may invest.

     PRIME 1:  Issuers  rated  "Prime  1" (or  supporting  institutions)  have a
superior ability for repayment of senior short-term promissory obligations.

     PRIME 2: Issuers rated "Prime 2" (or supporting institutions) have a strong
ability for repayment of senior short-term promissory obligations.

DESCRIPTION OF STANDARD & POOR'S CORPORATION'S RATINGS FOR MUNICIPAL BONDS:

INVESTMENT GRADE

     AAA:  Debt  rated  "AAA" has the  highest  rating  assigned  by  Standard &
Poor's. Capacity to pay interest and repay principal is extremely strong.

     AA: Debt rated "AA" has a very strong  capacity to pay  interest  and repay
principal and differs from the highest-rated issues only in a small degree.

     A:  Debt  rated  "A"  has a  strong  capacity  to pay  interest  and  repay
principal,  although it is somewhat more  susceptible to the adverse  effects of
changes in  circumstances  and  economic  conditions  than debt in  higher-rated
categories.

     BBB:  Debt rated "BBB" is  regarded  as having an adequate  capacity to pay
interest and repay principal.  Whereas it normally exhibits adequate  protection
parameters,  adverse  economic  conditions  or changing  circumstances  are more
likely to lead to a weakened  capacity to pay interest and repay  principal  for
debt in this category than in higher-rated categories.

SPECULATIVE

     BB, B, CCC,  CC:  Debt  rated in these  categories  is  regarded  as having
predominantly  speculative  characteristics  with  respect  to  capacity  to pay
interest and repay principal.  While such debt will likely have some quality and
protective characteristics, these are outweighed by large uncertainties or major
risk exposures to adverse conditions.

     BB: Debt rated "BB" has less near-term  vulnerability to default than other
speculative issues. However, it faces major ongoing uncertainties or exposure to
adverse  business,   financial,  or  economic  conditions  that  could  lead  to
inadequate  capacity to meet timely  interest and principal  payments.  The "BB"
rating  category  is also  used for debt  subordinated  to  senior  debt that is
assigned an actual or implied "BBB-" rating.

     B: Debt rated "B" has a greater  vulnerability to default but currently has
the  capacity  to meet  interest  payments  and  principal  repayments.  Adverse
business,  financial,  or economic  conditions  will likely  impair  capacity or
willingness to pay interest and repay principal. The "B" rating category is also
used for debt  subordinated to senior debt that is assigned an actual or implied
"BB" or "BB-" rating.

     CCC: Debt rated "CCC" has a currently identifiable vulnerability to default
and is dependent upon favorable business,  financial, and economic conditions to
meet timely  payment of interest  and  repayment of  principal.  In the event of
adverse business,  financial,  or economic conditions,  it is not likely to have
the capacity to pay interest and repay  principal.  The "CCC" rating category is
also used for debt  subordinated  to senior  debt that is  assigned an actual or
implied "B" or "B-" rating.

     CC: The rating "CC"  typically  is applied to debt  subordinated  to senior
debt that is assigned an actual or implied "CCC" debt rating.

     C: The "C" rating is typically  applied to debt subordinated to senior debt
that is assigned an actual or implied "CCC-" debt rating.  The "C" rating may be
used to cover a situation where a bankruptcy  petition has been filed,  but debt
service payments are continued.

     CI: The "CI"  rating is reserved  for income  bonds on which no interest is
being paid.

     D: Debt rated "D" is in default,  and payment of interest and/or  repayment
of principal is in arrears.

     PLUS (+) OR MINUS (-):  The  ratings  from "AA" to "CCC" may be modified by
the addition of a plus or minus sign to show relative  standing within the major
rating categories.

DESCRIPTION  OF STANDARD & POOR'S  CORPORATION'S  RATINGS FOR  INVESTMENT  GRADE
MUNICIPAL NOTES AND SHORT-TERM DEMAND OBLIGATIONS:

     SP-1:  Issues  carrying  this  designation  have a very  strong  or  strong
capacity to pay  principal  and  interest.  Those issues  determined  to possess
overwhelming safety characteristics will be given a plus (+) designation.

     SP-2: Issues carrying this designation have a satisfactory  capacity to pay
principal and interest.

DESCRIPTION OF STANDARD & POOR'S  CORPORATION'S  RATINGS FOR DEMAND  OBLIGATIONS
AND TAX-EXEMPT COMMERCIAL PAPER:

     A Standard & Poor's commercial paper rating is a current  assessment of the
likelihood of timely payment of debt having an original maturity of no more than
365 days. The two rating categories for securities in which the Funds may invest
are as follows:

     A-1: This highest  category  indicates that the degree of safety  regarding
timely payment is strong.  Those issues  determined to possess  extremely strong
safety characteristics are denoted with a plus (+) designation.

     A-2:  Capacity  for  timely  payment  on issues  with this  designation  is
satisfactory.  However,  the  relative  degree  of  safety is not as high as for
issues designated "A-1."



P.O. Box 419200
Kansas City, Missouri
64141-6200

Person-to-person assistance:
1-800-345-2021 or 816-531-5575

Automated Information Line:
1-800-345-8765

Telecommunications Device for the Deaf:
1-800-634-4113 or 816-753-1865

Fax: 816-340-7962

Internet: www.americancentury.com

                            [american century logo]
                                    American
                                  Century(sm)

9701           [recycled logo]
SH-BKT-6748       Recycled  

<PAGE>
AMERICAN CENTURY MUNICIPAL TRUST


1933 Act Post-Effective Amendment No. 19
1940 Act Amendment No. 20
- --------------------------------------------------------------------------------

PART C            OTHER INFORMATION

Item 24.  Financial Statements and Exhibits

(a)         FINANCIAL STATEMENTS. Audited financial statements for each series
            of the American Century Municipal Trust, with the exception of
            American Century - Limited-Term Tax-Free Fund, for the fiscal year
            ended May 31, 1996, are filed herein as included in the Trust's
            Statement of Additional Information by reference to the Annual
            Report dated May 31, 1996, filed on July 25, 1996 (Accession #
            0000746458-96-000011).

(b)         EXHIBITS.

        (1) a) Amended Declaration of Trust dated May 31, 1995, is incorporated
            herein by reference to Exhibit 1(a) of Post-Effective Amendment No.
            16 filed on July 28, 1995.

            b) Amendment to the Declaration of Trust dated October 21, 1996 is
            included herein.

        (2) Amended and Restated Bylaws dated May 17, 1995 are incorporated
            herein by reference to Exhibit 2 of Post-Effective Amendment No. 17
            filed on June 28, 1996 (Accession # 0000746458-96-000009).

        (3) Not applicable.

        (4) a) Specimen copy of American Century - Benham Tax-Free Money Market
            Fund, American Century - Benham Intermediate-Term Tax-Free Fund and
            American Century - Benham Long-Term Tax-Free Fund share certificate
            is incorporated herein by reference to Exhibit 4 to Post-Effective
            Amendment No. 10.

            b) Specimen copy of American Century - Benham Florida Municipal
            Money Market Fund's share certificate is incorporated herein by
            reference to Exhibit 4 to Post-Effective Amendment No. 15.

            c) Specimen copy of American Century - Benham Florida
            Intermediate-Term Municipal Fund's share certificate is incorporated
            herein by reference to Exhibit 4 to Post-Effective Amendment No. 15.

            d) Specimen copy of American Century - Benham Arizona
            Intermediate-Term Municipal Fund's share certificate is incorporated
            herein by reference to Exhibit 4 to Post-Effective Amendment No. 15.

            e) Specimen copy American Century - Benham Limited-Term Tax-Free
            Fund's share certificate is to be filed by amendment.
  

        (5) a) Investment Advisory Agreement between American Century Municipal
            Trust on behalf of all of its series, except American Century -
            Benham Limited-Term Tax-Free Fund, and Benham Management Corporation
            dated June 1, 1995, is incorporated herein by reference to Exhibit 5
            of Post-Effective Amendment No. 17 filed on June 28, 1996 (Accession
            # 746458-96-000009).

            b) Investment Management Agreement between American Century - Benham
            Limited-Term Tax-Free Fund and American Century Investment
            Management, Inc., dated -----, 1997 is to be filed by amendment.

        (6) Distribution Agreement between American Century Municipal Trust and
            American Century Investment Services, Inc. dated as of September 3,
            1996, is incorporated herein by reference to Exhibit 6 of
            Post-Effective Amendment No. 30 to the Registration Statement of the
            Benham Government Income Trust filed on November 25, 1996 (Accession
            # 773674-96-000009).

        (7) Not applicable.

        (8) Custodian Agreement between American Century Municipal Trust and The
            Chase Manhattan Bank dated August 9, 1996 is incorporated herein by
            reference to Exhibit 8 to Post Effective Amendment No. 31 of
            American Century Government Income Trust filed on February 7, 1997
            (Accession # 773674-97-000002).

        (9) Administrative Services and Transfer Agency Agreement between
            American Century Municipal Trust and American Century Services,
            Corporation dated as of September 3, 1996,. is incorporated herein
            by reference to Exhibit 9 of Post-Effective Amendment No. 30 to the
            Registration Statement of the American Century Government Income
            Trust filed on November 25, 1996 (Accession # 773674-96-000009).

        (10)Opinion and consent of counsel as to the legality of the securities
            being registered, dated July 17, 1996 is incorporated herein by
            reference to Rule 24f-2 Notice filed on July 17, 1996 (Accession #
            0000746458-96-000010).

        (11)Consent of KPMG Peat Marwick, independent auditors, is to be filed
            by amendment.

        (12)Not applicable.

        (13)Not applicable.

        (14)Not applicable.

        (15)Not applicable.

        (16)Schedule for computation of each performance quotation provided in
            response to Item 22 is incorporated herein by reference to Exhibit
            16 of Post-Effective Amendment No. 18 filed on September 3, 1996
            (Accession # 0000746458-96-000013).

        (17)Power of Attorney dated March 4, 1996 is incorporated herein by
            reference to Exhibit 17 of Post-Effective Amendment No. 17 filed on
            June 28, 1996 (Accession # 0000746458-96-000009).


Item 25. Persons Controlled by or Under Control with Registrant.

Not applicable.


Item 26. Number of Holders of Securities.

As of January 31, 1997, each operating series of the Registrant had the
following number of record shareholders:

American Century - Benham Tax-Free Money Market Fund                2,133
American Century - Benham Intermediate-Term Tax-Free Fund           1,611
American Century - Benham Long-Term Tax-Free Fund                   1,372
American Century - Benham Florida Municipal Money Market Fund       1,209
American Century - Benham Florida Intermediate-Term Municipal Fund    335
American Century - Benham Arizona Intermediate-Term Municipal Fund    653


Item 27. Indemnification.

As stated in Article VII, Section 3 of the Declaration of Trust, incorporated
herein by reference to Exhibit 1 to the Registration Statement, "The Trustees
shall be entitled and empowered to the fullest extent permitted by law to
purchase insurance for and to provide by resolution or in the Bylaws for
indemnification out of Trust assets for liability and for all expenses
reasonably incurred or paid or expected to be paid by a Trustee or officer in
connection with any claim, action, suit, or proceeding in which he or she
becomes involved by virtue of his or her capacity or former capacity with the
Trust. The provisions, including any exceptions and limitations concerning
indemnification, may be set forth in detail in the Bylaws or in a resolution
adopted by the Board of Trustees."

Registrant hereby incorporates by reference, as though set forth fully herein,
Article VI of the Registrant's Bylaws, amended on May 17, 1995, incorporated
herein by reference to Exhibit 2 of Post-Effective Amendment No. 17 filed on
June 28, 1996 (Accession # 0000746458-96-000009).


Item 28. Business and Other Connections of Investment Advisor.

Benham Management Corporation, the investment advisor to each of the
Registrant's Funds, with the exception of American Century - Benham Limited-Term
Tax-Free Fund, provides investment advisory services for various collective
investment vehicles and institutional clients and serves as investment advisor
to a number of open-end investment companies. American Century Investment
Management, Inc., the investment advisor to American Century - Benham
Limited-Term Tax-Free Fund, is engaged in the business of managing investments
for deferred compensation plans and other institutional investors.


Item 29. Principal Underwriters.

The Registrant's distribution agent, American Century Investment Services, Inc.,
is distribution agent to American Century Capital Preservation Fund, Inc.,
American Century Capital Preservation Fund II, Inc., American Century California
Tax-Free and Municipal Funds, American Century Government Income Trust, American
Century Municipal Trust, American Century Target Maturities Trust, American
Century Quantitative Equity Funds, American Century International Bond Funds,
American Century Investment Trust, American Century Manager Funds, TCI
Portfolios, Inc., American Century Capital Portfolios, Inc., American Century
Mutual Funds, Inc., American Century Premium Reserves, Inc., American Century
Strategic Asset Allocations, Inc. and American Century World Mutual Funds, Inc.
The information required with respect to each director, officer or partner of
American Century Investment Services, Inc. is incorporated herein by reference
to American Century Investment Services, Inc. Form B-D filed on November 21,
1985 (SEC File No. 8-35220; Firm CRD No. 17437).


Item 30. Location of Accounts and Records.

Benham Management Corporation, the investment advisor to each of the
Registrant's Funds, with the exception of American Century - Benham Limited-Term
Tax-Free Fund, maintains its principal office at 1665 Charleston Road, Mountain
View, CA 94043. The Registrant and its agent for transfer and administrative
services, American Century Services Corporation, maintain their principal office
at 4500 Main St., Kansas City, MO 64111. American Century Services Corporation
maintains physical possession of each account, book, or other document, and
shareholder records as required by ss.31(a) of the 1940 Act and rules
thereunder. The computer and data base for shareholder records are located at
Central Computer Facility, 401 North Broad Street, Sixth Floor, Philadelphia, PA
19108.


Item 31. Management Services.

Not applicable.


Item 32. Undertakings.

a)  Registrant undertakes to furnish each person to whom a Prospectus is
    delivered with a copy of the Registrant's latest report to shareholders,
    upon request and without charge.

b)  Registrant hereby undertakes to file, with respect to American Century -
    Benham Limited-Term Tax-Free Fund, a post-effective amendment using
    financial statements which need not be certified within four to six months
    from the commencement of operations.

c)  Registrant hereby undertakes to call a meeting of shareholders of the Trust
    upon written request of shareholders owning at least one-tenth of the
    outstanding shares.
<PAGE>
                                   SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company Act of 1940, the Registrant has duly caused this Post-Effective
Amendment No. 19/Amendment No. 20 to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Mountain View, and State of
California, on the 12th day of March, 1997.

                           AMERICAN CENTURY MUNICIPAL TRUST


                           By: /s/ Douglas A. Paul
                               Douglas A. Paul
                               Vice President and Associate General Counsel

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective
Amendment No. 19/Amendment No. 20 has been signed below by the following persons
in the capacities and on the dates indicated.

<TABLE>
<CAPTION>
                                                                          Date
<S>                                  <C>                                  <C>
*                                    Chairman of the Board of Trustees,   March 12, 1997
- ---------------------------------    President, and
James M. Benham                      Chief Executive Officer

*                                    Trustee                              March 12, 1997
- ---------------------------------
Albert A. Eisenstat

*                                    Trustee                              March 12, 1997
- ---------------------------------
Ronald J. Gilson

*                                    Trustee                              March 12, 1997
- ---------------------------------
Myron S. Scholes

*                                    Trustee                              March 12, 1997
- ---------------------------------
Kenneth E. Scott

*                                    Trustee                              March 12, 1997
- ---------------------------------
Isaac Stein

*                                    Trustee                              March 12, 1997
- ---------------------------------
James E. Stowers III

*                                    Trustee                              March 12, 1997
- ---------------------------------
Jeanne D. Wohlers

*                                    Chief Financial Officer, Treasurer   March 12, 1997
- ---------------------------------
Maryanne Roepke
</TABLE>

/s/ Douglas A. Paul
*by Douglas A. Paul, Attorney in Fact (pursuant to a Power of Attorney dated 
March 4, 1996).

EXHIBIT     DESCRIPTION

EX-99.B1    a)Amended Declaration of Trust dated May 31, 1995, is incorporated 
            herein by reference to Exhibit 1(a) of Post-Effective Amendment No.
            16 filed on July 28, 1995.

            b)Amendment to the Declaration of Trust dated October 21, 1996 is
            included herein.

EX-99.B2    Amended and Restated Bylaws dated May 17, 1995 are incorporated 
            herein by reference to Exhibit 2 of Post-Effective Amendment No. 17
            filed on June 28, 1996 (Accession # 0000746458-96-000009).

EX-99.B4    a) Specimen copy of American Century - Benham Tax-Free Money Market
            Fund, American Century - Benham Intermediate-Term Tax-Free Fund and
            American Century - Benham Long-Term Tax-Free Fund share certificate
            is incorporated herein by reference to Exhibit 4 to Post-Effective
            Amendment No. 10.

            b) Specimen copy of American Century - Benham Florida Municipal
            Money Market Fund's share certificate is incorporated herein by
            reference to Exhibit 4 to Post-Effective Amendment No. 15.

            c) Specimen copy of American Century - Benham Florida
            Intermediate-Term Municipal Fund's share certificate is incorporated
            herein by reference to Exhibit 4 to Post-Effective Amendment No. 15.

            d) Specimen copy of American Century - Benham Arizona
            Intermediate-Term Municipal Fund's share certificate is incorporated
            herein by reference to Exhibit 4 to Post-Effective Amendment No. 15.

            e) Specimen copy American Century - Benham Limited-Term Tax-Free
            Fund's share certificate is to be filed by amendment.
  
EX-99.B5    a) Investment Advisory Agreement between American Century Municipal
            Trust on behalf of all of its series, except American Century -
            Benham Limited-Term Tax-Free Fund, and Benham Management Corporation
            dated June 1, 1995, is incorporated herein by reference to Exhibit 5
            of Post-Effective Amendment No. 17 filed on June 28, 1996 (Accession
            # 746458-96-000009).

            b) Investment Management Agreement between American Century - Benham
            Limited-Term Tax-Free Fund and American Century Investment
            Management, Inc., dated -----, 1997 is to be filed by amendment.

EX-99.B6    Distribution Agreement between Benham Municipal Trust and American
            Century Investment Services, Inc. dated as of September 3, 1996, is
            incorporated herein by reference to Exhibit 6 of Post-Effective
            Amendment No. 30 to the Registration Statement of the Benham
            Government Income Trust filed on November 25, 1996 (Accession #
            773674-96-000009).

EX-99.B8    Custodian Agreement between American Century Municipal Trust and The
            Chase Manhattan Bank dated August 9, 1996 is incorporated herein by
            reference to Exhibit 8 to Post Effective Amendment No. 31 of
            American Century Government Income Trust filed on February 7, 1997
            (Accession # 773674-97-000002).

EX-99.B9    Administrative Services and Transfer Agency Agreement between
            American Century Municipal Trust and American Century Services,
            Corporation dated as of September 3, 1996,. is incorporated herein
            by reference to Exhibit 9 of Post-Effective Amendment No. 30 to the
            Registration Statement of the American Century Government Income
            Trust filed on November 25, 1996 (Accession # 773674-96-000009).

EX-99.B10   Opinion and consent of counsel as to the legality of the securities
            being registered, dated July 17, 1996 is incorporated herein by
            reference to Rule 24f-2 Notice filed on July 17, 1996 (Accession #
            0000746458-96-000010).

EX-99.B11   Consent of KPMG Peat Marwick, independent auditors, is to be filed 
            by amendment.

EX-99.B16   Schedule for computation of each performance quotation provided in 
            response to Item 22 is incorporated herein by reference to Exhibit
            16 of Post-Effective Amendment No. 18 filed on September 3, 1996
            (Accession # 0000746458-96-000013).

EX-99.B17   Power of Attorney dated March 4, 1996 is incorporated herein by 
            reference to Exhibit 17 of Post-Effective Amendment No. 17 filed on
            June 28, 1996 (Accession # 0000746458-96-000009).

EX-27.4.1   FDS - American Century - Benham Tax-Free Money Market Fund.

EX-27.4.2   FDS - American Century - Benham Florida Municipal Money Market Fund.

EX-27.5.3   FDS - American Century - Benham Intermediate-Term Tax-Free Fund.

EX-27.5.4   FDS - American Century - Benham Florida Intermediate-Term Municipal 
                    Fund.

EX-27.5.5   FDS - American Century - Benham Arizona Intermediate-Term Municipal 
                    Fund.

EX-27.5.6   FDS - American Century - Benham Long-Term Tax-Free Fund.




                                    AMENDMENT
                                     TO THE
                              DECLARATION OF TRUST
                                       OF

                             BENHAM MUNICIPAL TRUST

                                October 21, 1996

         WHEREAS,  Section 1 of Article I of the  Declaration  of Trust provides
that the Trustees may designate a new name for the Trust,  or any Series,  to be
effective upon execution by a majority of the Trustees of an instrument  setting
forth the new names;

         WHEREAS, the Trustees have determined that it is appropriate and in the
interests  of the  Trust to change  the name of the Trust and its  Series as set
forth below;

         RESOLVED,  that the Trust shall  henceforth  be known as the  "American
Century Municipal Trust";

         RESOLVED  FURTHER,  that the existing Series be renamed as follows (new
language appears in boldface type, deleted language is struck through):
<TABLE>
Former Name                                                  New Name
- ------------------------------------------------------------ ------------------------------------------------------------------
- ------------------------------------------------------------ ------------------------------------------------------------------
<S>                                                            <C>
Benham Arizona Municipal Intermediate-Term Fund              American Century - Benham Arizona Intermediate-Term Municipal Fund
- ------------------------------------------------------------ ------------------------------------------------------------------
- ------------------------------------------------------------ ------------------------------------------------------------------
Benham Florida Municipal Money Market Fund                   American Century - Benham Florida Municipal Money Market Fund
- ------------------------------------------------------------ ------------------------------------------------------------------
- ------------------------------------------------------------ ------------------------------------------------------------------
Benham Florida Municipal Intermediate-Term Fund              American Century - Benham Florida Intermediate-Term Municipal Fund
- ------------------------------------------------------------ ------------------------------------------------------------------
- ------------------------------------------------------------ ------------------------------------------------------------------
Benham National Tax-Free Money Market Fund                   American Century - Benham Tax-Free Money Market Fund
- ------------------------------------------------------------ ------------------------------------------------------------------
- ------------------------------------------------------------ ------------------------------------------------------------------
Benham National Tax-Free Intermediate-Term Fund              American Century - Benham Intermediate-Term Tax-Free Fund
- ------------------------------------------------------------ ------------------------------------------------------------------
- ------------------------------------------------------------ ------------------------------------------------------------------
Benham National Tax-Free Long-Term Fund                      American Century - Benham Long-Term Tax-Free Fund
- ------------------------------------------------------------ ------------------------------------------------------------------

TRUSTEES OF THE BENHAM MUNICIPAL TRUST

/s/ James M. Benham                       10/21/96          /s/ Ezra Solomon                          10/21/96
- ----------------------------------------  -------------     ----------------------------------------  --------
James M. Benham*                          Date              Ezra Solomon*                             Date

/s/ Albert A. Eisenstat                   10/21/96          /s/ Isaac Stein                           10/21/96
- ----------------------------------------  -------------     ----------------------------------------  --------
Albert A. Eisenstat*                      Date              Isaac Stein*                              Date

/s/ Ronald J. Gilson                      10/21/96          /s/ James E. Stowers III                  10/21/96
- ----------------------------------------  -------------     ----------------------------------------  --------
Ronald J. Gilson*                         Date              James E. Stowers III*                     Date

/s/ Myron S. Scholes                      10/21/96          /s/ Jeanne D. Wohlers                     10/21/96
- ----------------------------------------  -------------     ----------------------------------------  --------
Myron S. Scholes*                         Date              Jeanne D. Wohlers*                        Date

/s/ Kenneth E. Scott                      10/21/96
- ----------------------------------------  --------
Kenneth E. Scott*                         Date


*By:   /s/Douglas A Paul                                                        Date:  October 21, 1996
       -----------------
       Douglas A. Paul, Esq.
       Pursuant to Power of Attorney dated March 4, 1996
</TABLE>

<TABLE> <S> <C>

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   <NUMBER> 1
   <NAME> TAX-FREE MONEY MARKET
       
<S>                       <C>
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<PERIOD-END>                                 MAY-31-1996
<INVESTMENTS-AT-COST>                                90155958
<INVESTMENTS-AT-VALUE>                               90155958
<RECEIVABLES>                                         1157861
<ASSETS-OTHER>                                         513032
<OTHER-ITEMS-ASSETS>                                        0
<TOTAL-ASSETS>                                       91826851
<PAYABLE-FOR-SECURITIES>                               635148
<SENIOR-LONG-TERM-DEBT>                                     0
<OTHER-ITEMS-LIABILITIES>                               74071
<TOTAL-LIABILITIES>                                    709219
<SENIOR-EQUITY>                                     911176320
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<SHARES-COMMON-STOCK>                                91117632
<SHARES-COMMON-PRIOR>                                92034098
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<OVERDISTRIBUTION-NII>                                      0
<ACCUMULATED-NET-GAINS>                                     0
<OVERDISTRIBUTION-GAINS>                                    0
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<AVG-DEBT-OUTSTANDING>                                      0
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
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<TABLE> <S> <C>

<ARTICLE> 6
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   <NUMBER> 3
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<PERIOD-END>                                 MAY-31-1996
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<INVESTMENTS-AT-VALUE>                               61449665
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<TOTAL-ASSETS>                                       63526641
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<TOTAL-LIABILITIES>                                    626542
<SENIOR-EQUITY>                                      59012820
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<OVERDISTRIBUTION-NII>                                      0
<ACCUMULATED-NET-GAINS>                               (437657)
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<TABLE> <S> <C>

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<TABLE> <S> <C>

<ARTICLE> 6
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   <NAME> ARIZONA INTERMEDIATE-TERM MUNICIPAL
       
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<PERIOD-TYPE>                                YEAR
<FISCAL-YEAR-END>                            MAY-31-1996
<PERIOD-END>                                 MAY-31-1996
<INVESTMENTS-AT-COST>                                24578446
<INVESTMENTS-AT-VALUE>                               24884624
<RECEIVABLES>                                          684910
<ASSETS-OTHER>                                         711418
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<TOTAL-ASSETS>                                       26280952
<PAYABLE-FOR-SECURITIES>                               457456
<SENIOR-LONG-TERM-DEBT>                                     0
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<TOTAL-LIABILITIES>                                    491984
<SENIOR-EQUITY>                                      25003360
<PAID-IN-CAPITAL-COMMON>                               492686
<SHARES-COMMON-STOCK>                                 2500336
<SHARES-COMMON-PRIOR>                                 1910084
<ACCUMULATED-NII-CURRENT>                                   0
<OVERDISTRIBUTION-NII>                                      0
<ACCUMULATED-NET-GAINS>                                (13256)
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<OTHER-INCOME>                                              0
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<APPREC-INCREASE-CURRENT>                             (276781)
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<EQUALIZATION>                                              0
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<DISTRIBUTIONS-OF-GAINS>                                12741
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<ACCUMULATED-GAINS-PRIOR>                              (88555)
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<INTEREST-EXPENSE>                                          0
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<PER-SHARE-DISTRIBUTIONS>                                0.52
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<EXPENSE-RATIO>                                          0.14
<AVG-DEBT-OUTSTANDING>                                      0
<AVG-DEBT-PER-SHARE>                                     0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
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   <NUMBER> 6
   <NAME> LONG-TERM TAX-FREE FUND
       
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