AMERICAN CENTURY GOVERNMENT INCOME TRUST
485BPOS, 1999-07-28
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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. 2-99222

         Pre-Effective Amendment No. ____

         Post-Effective Amendment No._39_                           [X]

                                     and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940     [X]


         File No. 811-4363

         Amendment No._40_

                        (Check appropriate box or boxes.)


                    AMERICAN CENTURY GOVERNMENT INCOME TRUST
               __________________________________________________
               (Exact Name of Registrant as Specified in Charter)


                             American Century Tower
                     4500 Main Street, Kansas City, MO 64111
                    ________________________________________
                    (Address of Principal Executive Offices)


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


         David C. Tucker, Esq., 4500 Main Street, Kansas City, MO 64111
       _________________________________________________________________
                     (Name and Address of Agent for Service)

          Approximate Date of Proposed Public Offering: August 1, 1999


It is proposed that this filing become effective:

     [ ] immediately upon filing pursuant to paragraph (b)
     [X] on August 1, 1999 pursuant to paragraph (b)
     [ ] 60 days after filing pursuant to paragraph (a)(1)
     [ ] on (date) pursuant to paragraph (a)(1)
     [ ] 75 days after filing pursuant to paragraph (a)(2)
     [ ] on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

     [ ] This post-effective amendment designates a new effective date for a
         previously filed post-effective amendment.
- --------------------------------------------------------------------------------
<PAGE>
 [front cover]

                               AMERICAN CENTURY

                                  Prospectus

                                                      Capital Preservation Fund

                                            Government Agency Money Market Fund

                                                       Short-Term Treasury Fund

                                                Intermediate-Term Treasury Fund

                                                        Long-Term Treasury Fund


                                               Inflation-Adjusted Treasury Fund


                                                     Short-Term Government Fund

                                                                      GNMA Fund

                                               [american century logo (reg. sm)]
                                                                        American
                                                                         Century

[left margin]

                                                                 August 1, 1999
                                                                 INVESTOR CLASS

   THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THESE
SECURITIES OR DETERMINED IF THIS PROSPECTUS IS ACCURATE OR COMPLETE. ANYONE WHO
                   TELLS YOU OTHERWISE IS COMMITTING A CRIME.

                     Distributed by Funds Distributor, Inc.



Dear Investor,


   Reading a prospectus  doesn't have to be a chore. We've done the hard work so
you can focus on what's  important--learning  about the funds and tracking  your
investments. Take a look inside, and you'll see this prospectus is different. It
takes a clear-cut approach to fund information.

   Here's what you'll find:

   * The funds' primary investments and risks

   * A description of who may or may not want to invest in the funds

   * Fund performance, including returns for each year, best and worst quarters,
     and average annual returns compared to the funds' benchmarks

   * An overview of services available and ways to manage your accounts

   * Helpful tips and definitions of key investment terms

   Whether you're a current  investor or investing in mutual funds for the first
time, this prospectus will give you a clear  understanding  of the funds. If you
have questions, our Investor Relations Representatives are available weekdays, 7
a.m. to 7 p.m.,  and  Saturdays,  9 a.m. to 2 p.m.,  Central time. Our toll-free
number is 1-800-345-2021.  We look forward to helping you achieve your financial
goals.


                                Sincerely,


                                /s/Mark Killen

                                Mark Killen
                                Senior Vice President
                                American Century Investment Services, Inc.


[left margin]

[american century logo (reg. sm)]
American
Century


                               American Century
                                  Investments

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




TABLE OF CONTENTS


An Overview of the Funds ..................................................    2
Fund Performance History ..................................................    3
Fees and Expenses .........................................................    9
Information about the Funds ...............................................   10
Capital Preservation Fund
   Government Agency Money Market Fund
   Short-Term Treasury Fund ...............................................   11
   Intermediate-Term Treasury Fund
   Long-Term Treasury Fund ................................................   12
   Inflation-Adjusted Treasury Fund .......................................   13
   Short-Term Government Fund .............................................   14
   GNMA Fund ..............................................................   15
Basics of Fixed-Income Investing ..........................................   15
Management ................................................................   18
Investing with American Century ...........................................   21
Share Price and Distributions .............................................   25
Taxes .....................................................................   26
Multiple Class Information ................................................   27
Financial Highlights ......................................................   28


[left margin]


Throughout  this  book  you'll  find  definitions  of key  investment  terms and
phrases.  When you see a word printed in GREEN ITALICS,  look for its definition
in the left margin.

[graphic of pointing index finger] This symbol  highlights  special  information
and helpful tips.



                                                    American Century Investments



AN OVERVIEW OF THE FUNDS

WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES?

These funds seek income and investment returns by investing in various types of
U.S. government securities.

WHAT ARE THE FUNDS' PRIMARY INVESTMENT STRATEGIES AND PRINCIPAL RISKS?

The funds  invest  most of their  assets in DEBT  SECURITIES  issued by the U.S.
government  or its  agencies  or  instrumentalities.  The chart  below shows the
primary  differences  among the funds.  A more  detailed  description  about the
funds' investment strategies and risks begins on page 10.

Fund                  Primary Investments             Principal Risks
- --------------------------------------------------------------------------------
Capital Preservation   Very short-term U.S.           Lowest interest rate risk
                       Treasury securities            Lowest inflation risk
- --------------------------------------------------------------------------------
Government Agency      Very short-term U.S.           Very low credit risk
Money Market           government securities          Lowest interest rate risk
                                                      Lowest inflation risk
- --------------------------------------------------------------------------------
Short-Term             U.S. Treasury securities       Low interest rate risk
Treasury               that mature in three           Low inflation risk
                       years or less
- --------------------------------------------------------------------------------
Intermediate-Term      U.S. Treasury securities       Interest rate risk
Treasury               that mature in three           Inflation
risk
                       years or more
- --------------------------------------------------------------------------------
Long-Term Treasury    U.S. Treasury securities        High interest rate risk
                      that mature in 10 years         High inflation risk
                      or more
- --------------------------------------------------------------------------------
Short-Term            U.S. government securities      Some credit risk
Government            that mature in three years      Low interest rate risk
                      or less                         Low inflation risk
- --------------------------------------------------------------------------------
GNMA Fund              Ginnie Maes, which are         Interest rate risk
                       mortgage-backed securities     Low credit risk
                       issued by Government National  High inflation risk
                       Mortgage Association
- --------------------------------------------------------------------------------
Inflation-Adjusted    Inflation-indexed U.S.          Interest rate risk
Treasury              Treasury securities             Low inflation risk

As with all funds, at any given time the value of your shares of the fund may be
worth more or less than the price you paid. If you sell shares when the value is
less than the price you paid, you will lose money.

WHO MAY WANT TO INVEST IN THE FUNDS?

The funds may be a good investment if you

* are seeking current income

* prefer a relatively safe investment over one that may provide better long-term
  investment returns

* are seeking diversification by investing in a fixed-income mutual fund


* are comfortable with the funds' other investment risks

WHO MAY NOT WANT TO INVEST IN THE FUNDS?

The funds may not be a good investment if you are

* investing for long-term growth

* looking for the added security of FDIC insurance

[left margin]

DEBT  SECURITIES  include   fixed-income   investments  such  as  notes,  bonds,
commercial paper and Treasury bills.


[graphic of pointing index finger]
An  investment  in the funds is not a bank  deposit,  and it is not  insured  or
guaranteed  by the Federal  Deposit  Insurance  Corporation  (FDIC) or any other
government  agency.  Although the money market funds (Capital  Preservation  and
Government  Agency) seek to preserve the value of your  investment  at $1.00 per
share, it is possible to lose money by investing in them.




2  American Century Investments                                1-800-345-2021


FUND PERFORMANCE HISTORY

CAPITAL PRESERVATION FUND
GOVERNMENT AGENCY MONEY MARKET FUND

Annual Total Returns(1)

The  following  bar chart shows the  performance  of the funds'  Investor  Class
shares for each of the last 10 calendar  years or for each full year in the life
of the fund if less than 10 years.  It indicates  the  volatility  of the funds'
historical returns from year to year.

[bar chart data shown below]

<TABLE>
                        1998   1997   1996   1995   1994   1993   1992   1991   1990   1989
<S>                     <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Capital Preservation    4.92%  4.97%  4.85%  5.32%  3.63%  2.65%  3.31%  5.62%  7.64%  8.28%
Government Agency
   Money Market         5.07%  5.07%  4.93%  5.50%  3.75%  2.68%  3.39%  6.01%  8.34%
</TABLE>


(1) As of June 30, 1999, the end of the most recent calendar quarter, the funds'
year-to-date  returns were Capital  Preservation,  2.08% and  Government  Agency
Money Market, 2.21%.


The highest and lowest  quarterly  returns for the period  reflected  in the bar
chart are:


                                    Highest                 Lowest
- -------------------------------------------------------------------------------
Capital Preservation                2.12% (2Q 1989)         0.63% (2Q 1993)
- -------------------------------------------------------------------------------
Government Agency Money Market      7.68% (2Q 1989)         -2.39% (1Q 1994)


Average Annual Returns


The  following  table shows the average  annual  returns of the funds'  Investor
Class shares for the periods  indicated.  The benchmarks  are unmanaged  indices
that have no  operating  costs  and are  included  in the table for  performance
comparison.

For the calendar year ended December 31, 1998
                                  1 year    5 years   10 years   Life of Fund(1)
- --------------------------------------------------------------------------------
Capital Preservation              4.92%     4.74%     5.10%      5.31%
90-Day Treasury Bill Index        4.50%     4.95%     5.28%      7.05%(2)
- --------------------------------------------------------------------------------
Government Agency Money Market    5.07%     4.86%     N/A        4.98%
90-Day Treasury Bill Index        4.50%     4.95%     5.28%      4.94%(3)

(1) The inception  dates for the funds are:  Capital  Preservation,  October 13,
    1972, and Government Agency Money Market, December 5, 1989.

(2) Benchmark from October 31, 1972.

(3) Benchmark from December 31, 1989.


[left margin]


[graphic of pointing index finger]
The  performance  information  on this page is designed to help you see how fund
returns can vary.  Keep in mind that past  performance  does not predict how the
funds will perform in the future.

[graphic of pointing index finger]
For current performance  information,  including seven-day yield, please call us
at    1-800-345-2021    or    visit    American    Century's    Web    site   at
www.americancentury.com.



www.americancentury.com                       American Century Investments   3


FUND PERFORMANCE HISTORY

SHORT-TERM TREASURY FUND
INTERMEDIATE-TERM TREASURY FUND
LONG-TERM TREASURY FUN

Annual Total Returns(1)

The  following  bar chart shows the  performance  of the funds'  Investor  Class
shares for each of the last 10 calendar  years or for each full year in the life
of the fund if less than 10 years.  It indicates  the  volatility  of the funds'
historical returns from year to year.

[bar chart data shown below]

<TABLE>
                               1998   1997   1996   1995   1994   1993   1992   1991   1990   1989
<S>                            <C>    <C>    <C>    <C>    <C>    <C>
Short-Term Treasury            6.44%  6.11%  4.12%  9.93%  0.15%  5.32%
Intermediate-Term Treasury     8.94%  8.38%  4.08% 13.70% -2.34%  7.91%  6.55% 13.75%  9.20%  11.93%
Long-Term Treasury            12.76% 14.76% -1.36% 29.25% -9.25% 17.64%
</TABLE>


(1) As of June 30, 1999, the end of the most recent calendar quarter, the funds'
year-to-date   returns  were  Short-Term  Treasury,   0.57%;   Intermediate-Term
Treasury, -2.43%; and Long-Term Treasury, -6.46%.


The highest and lowest  quarterly  returns for the period  reflected  in the bar
chart are:


                                Highest                     Lowest
- --------------------------------------------------------------------------------
Short-Term Treasury             3.14% (1Q 1995)             -0.54% (1Q 1994)
- --------------------------------------------------------------------------------
Intermediate-Term Treasury      6.67% (2Q 1989)             -2.04% (1Q 1994)
- --------------------------------------------------------------------------------
Long-Term Treasury              10.48% (2Q 1995)            -7.00% (1Q 1996)


[left margin]


[graphic of pointing index finger]
The  performance  information  on this page is designed to help you see how fund
returns can vary.  Keep in mind that past  performance  does not predict how the
funds will perform in the future.



4   American Century Investments                             1-800-345-2021


Average Annual Returns


The  following  table shows the average  annual  returns of the funds'  Investor
Class shares for the periods  indicated.  The benchmarks  are unmanaged  indices
that have no  operating  costs  and are  included  in the table for  performance
comparison.


<TABLE>
For the calendar year ended December 31, 1998        1 year    5 years    10 years    Life of Fund(1)
- -----------------------------------------------------------------------------------------------------
<S>                                                  <C>       <C>        <C>          <C>

Short-Term Treasury                                  6.44%     5.30%      N/A          5.07%
Salomon 1- to 3-Year Treasury/Agency Index(2)        6.98%     5.94%      N/A          5.65%(3)
Lehman 1- to 3-Year Government Securities Index      6.96%     5.96%      N/A          5.66%(3)
- -----------------------------------------------------------------------------------------------------
Intermediate-Term Treasury                           8.94%     6.41%      8.04%        8.86%
Salomon 3- to 10-Year Treasury Index                10.21%     7.14%      8.67%        9.88%(4)
- -----------------------------------------------------------------------------------------------------
Long-Term Treasury                                  12.76%     8.41%      N/A          9.38%
Salomon Long-Term Treasury/Agency Index             13.38%     9.35%      N/A         10.40%(3)
</TABLE>

(1) The  inception  dates for the funds are:  Short-Term  Treasury and Long-Term
Treasury, September 8, 1992; and Intermediate-Term Treasury, May 16, 1980.

(2) The fund's  benchmark was changed because the Salomon Index provides a daily
breakdown of its individual  bond holdings and their prices.  This change allows
us much more accurate  tracking of the benchmark and more exact  modeling of the
fund's portfolio.

(3) Benchmark from September 30, 1992.

(4) Benchmark from May 31, 1980.


[left margin]


[graphic of pointing index finger]
For  current  performance  information,  including  yields,  please  call  us at
1-800-345-2021 or visit American Century's Web site at www.americancentury.com.



www.americancentury.com                        American Century Investments  5



FUND PERFORMANCE HISTORY

INFLATION-ADJUSTED TREASURY FUND

Annual Total Returns(1)

The  following  bar chart shows the  performance  of the fund's  Investor  Class
shares for each full  calendar  year in the life of the fund.  It indicates  the
volatility of the fund's historical returns from year to year.


                                 1998
Inflation-Adjusted Treasury      3.45%


(1) As of  June  30,  1999,  the  end  of  the  most  recent  calendar  quarter,
Inflation-Adjusted Treasury's year-to-date return was 1.52%.

The highest and lowest  quarterly  returns for the period  reflected  in the bar
chart are:

                                Highest                     Lowest
- --------------------------------------------------------------------------------
Inflation-Adjusted Treasury     2.27% (3Q 1998)             -0.37% (4Q 1998)

Average Annual Returns

The  following  table shows the average  annual  returns of the fund's  Investor
Class shares for the periods  indicated.  The benchmarks  are unmanaged  indices
that have no  operating  costs  and are  included  in the table for  performance
comparison.

For the calendar year ended December 31, 1998  1 year       Life of Fund(1)
- --------------------------------------------------------------------------------
Inflation-Adjusted Treasury                    3.45%              2.36%
Salomon U.S. Inflation-Linked Index            3.92%              3.30%(2)
Salomon 10+ Year Treasury Index               13.49%             16.11%(2)

(1) The inception date for the fund is February 10, 1997.

(2) Benchmark from February 28, 1997.


[left margin]


[graphic of pointing index finger]
The  performance  information  on this page is designed to help you see how fund
returns can vary.  Keep in mind that past  performance  does not predict how the
fund will perform in the future.

[graphic of pointing index finger]
For  current  performance  information,  including  yields,  please  call  us at
1-800-345-2021 or visit American Century's Web site at www.americancentury.com



6   American Century Investments                             1-800-345-2021



FUND PERFORMANCE HISTORY

SHORT-TERM GOVERNMENT FUND

Annual Total Returns(1)

The  following  bar chart shows the  performance  of the fund's  Investor  Class
shares for each of the last 10 calendar  years.  It indicates the  volatility of
the fund's historical returns from year to year.


<TABLE>
                         1998   1997   1996   1995    1994    1993   1992   1991    1990   1989
<S>                      <C>    <C>    <C>    <C>      <C>    <C>    <C>    <C>     <C>    <C>
Short-Term Government    6.04%  6.02%  4.11%  10.51%  -0.49%  4.17%  4.39%  11.64%  7.53%  9.99%
</TABLE>


(1) As of June 30, 1999, the end of the most recent calendar quarter, Short-Term
Government's year-to-date return was -0.04%.

The highest and lowest  quarterly  returns for the period  reflected  in the bar
chart are:

                                Highest                     Lowest
- -----------------------------------------------------------------------------
Short-Term Government           5.13% (2Q 1989)             -1.03% (1Q 1994)

Average Annual Returns

The  following  table shows the average  annual  returns of the fund's  Investor
Class shares for the periods indicated. The benchmark is an unmanaged index that
has no operating costs and is included in the table for performance comparison.

For calendar year ended December 31, 1998
                           1 year     5 years    10 years   Life of Fund(1)
- ----------------------------------------------------------------------------
Short-Term Government       6.04%      5.18%      6.33%         7.16%
Salomon 1- to 3-Year
   Treasury/Agency Index    6.98%      5.94%      7.34%         8.25%(2)

(1) The inception date for the fund is December 15, 1982.

(2) Benchmark from December 31, 1982.



[left margin]


[graphic of pointing index finger]
The  performance  information  on this page is designed to help you see how fund
returns can vary.  Keep in mind that past  performance  does not predict how the
fund will perform in the future.

[graphic of pointing index finger]
For  current  performance  information,  including  yields,  please  call  us at
1-800-345-2021 or visit American Century's Web site at www.americancentury.com.



www.americancentury.com                       American Century Investments   7



FUND PERFORMANCE HISTORY

GNMA FUND

Annual Total Returns(1)

The  following  bar chart shows the  performance  of the fund's  Investor  Class
shares for each of the last 10 calendar  years.  It indicates the  volatility of
the fund's historical returns from year to year.


<TABLE>
          1998   1997   1996   1995    1994    1993   1992   1991    1990   1989
<S>       <C>    <C>    <C>    <C>      <C>    <C>    <C>    <C>     <C>     <C>
GNMA      6.33%  8.79%  5.21%  15.86%  -1.67%  6.59%  7.67%  15.56%  10.15%  13.90%
</TABLE>


(1) As of June 30, 1999,  the end of the most recent  calendar  quarter,  GNMA's
year-to-date return was -0.02%.

The highest and lowest  quarterly  returns for the period  reflected  in the bar
chart are:

                                Highest                     Lowest
- --------------------------------------------------------------------------------
GNMA                            7.68% (2Q 1989)             -2.39% (1Q 1994)

Average Annual Returns

The  following  table shows the average  annual  returns of the fund's  Investor
Class shares for the periods indicated. The benchmark is an unmanaged index that
has no operating costs and is included in the table for performance comparison.

For the calendar year ended December 31, 1998
                             1 year    5 years    10 years    Life of Fund(1)
- ------------------------------------------------------------------------------
GNMA Fund                    6.33%     6.75%      8.72%       8.70%
Salomon 30-Year GNMA Index   6.82%     7.34%      9.29%       9.60%(2)

(1) The inception date for the fund is September 23, 1985.

(2) Benchmark from September 30, 1985.


[left margin]


[graphic of pointing index finger]
The  performance  information  on this page is designed to help you see how fund
returns can vary.  Keep in mind that past  performance  does not predict how the
fund will perform in the future.

[graphic of pointing index finger]
For  current  performance  information,  including  yields,  please  call  us at
1-800-345-2021 or visit American Century's Web site at www.americancentury.com.



8  American Century Investments                                 1-800-345-2021



FEES AND EXPENSES


There are no sales loads, fees or other charges

* to buy fund shares directly from American Century

* to reinvest dividends in additional shares

* to exchange into the Investor Class shares of other American Century funds

* to redeem your shares

The following table describes the fees and expenses that you will pay if you buy
and hold shares of the funds.

ANNUAL OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)


                                  Distribution                  Total Annual
                     Management   and Service    Other          Fund Operating
                     Fee(1)       (12b-1) Fees   Expenses(2)    Expenses
- ------------------------------------------------------------------------------
Capital
Preservation         0.47%        None              0.00%          0.47%
- ------------------------------------------------------------------------------
Government Agency
Money Market         0.47%        None              0.00%          0.47%
- ------------------------------------------------------------------------------
Short-Term
Treasury             0.51%        None              0.00%          0.51%
- ------------------------------------------------------------------------------
Intermediate-Term
Treasury             0.51%        None              0.00%          0.51%
- ------------------------------------------------------------------------------
Long-Term
Treasury             0.51%        None              0.00%          0.51%
- ------------------------------------------------------------------------------
Inflation-Adjusted
Treasury             0.51%        None              0.00%          0.51%
- ------------------------------------------------------------------------------
Short-Term
Government           0.59%        None              0.00%          0.59%
- ------------------------------------------------------------------------------
GNMA Fund            0.59%        None              0.00%          0.59%

(1) Based on expenses  incurred  during the funds' most recent fiscal year.  The
funds have stepped fee schedules.  As a result,  the funds'  management fee rate
generally decreases as fund assets increase.

(2)  Other  expenses,  which  include  the  fees  and  expenses  of  the  funds'
independent trustees,  their legal counsel and interest, are expected to be less
than 0.005% for the current fiscal year.


EXAMPLE

The examples in the table below are intended to help you compare the costs of
investing in a fund with the costs of investing in other mutual funds. Assuming
you ...

* invest $10,000 in the fund

* redeem all of your shares at the end of the periods shown below

* earn a 5% return each year

* incur the same operating expenses as shown above

 ... your cost of investing in the fund would be:


                            1 year       3 years       5 years        10 years
- ------------------------------------------------------------------------------
Capital Preservation        $48          $151          $263           $591
- ------------------------------------------------------------------------------
Government Agency
Money Market                $48          $151          $263           $591
- ------------------------------------------------------------------------------
Short-Term Treasury         $52          $163          $285           $640
- ------------------------------------------------------------------------------
Intermediate-Term
Treasury                    $52          $163          $285           $640
- ------------------------------------------------------------------------------
Long-Term Treasury          $52          $163          $285           $640
- ------------------------------------------------------------------------------
Inflation-Adjusted
Treasury                    $52          $163          $285           $640
- ------------------------------------------------------------------------------
Short-Term Government       $60          $189          $329           $736
- ------------------------------------------------------------------------------
GNMA Fund                   $60          $189          $329           $736



[left margin]

[graphic of pointing index finger]
Use this example to compare the costs of  investing  in other funds.  Of course,
your actual costs may be higher or lower.


www.americancentury.com                     American Century Investments   9


INFORMATION ABOUT THE FUNDS

CAPITAL PRESERVATION FUND
GOVERNMENT AGENCY MONEY MARKET FUND

WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES?

The funds are money market funds that seek maximum safety and liquidity and seek
to pay shareholders  the highest rate of return  consistent with this objective.
In  addition,  Government  Agency  Money  Market  seeks to  purchase  only those
securities with income that will be exempt from state income tax.


HOW DO THE FUNDS PURSUE THEIR INVESTMENT OBJECTIVES?


The funds buy very  short-term U.S.  Treasury  securities that are guaranteed by
the direct full faith and credit pledge of the U.S. government.

Government Agency Money Market also buys other very short-term securities issued
by the U.S. government, its agencies and instrumentalities.  The U.S. government
provides   varying   levels  of   financial   support  to  these   agencies  and
instrumentalities.

The funds may purchase  securities in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions,   the  funds  may  purchase  securities  in  advance  to  generate
additional income.


Additional information about the funds' investments is available in their annual
and  semiannual  reports.  In these  reports you will find a  discussion  of the
market  conditions and investment  strategies  that  significantly  affected the
funds'  performance  during the most  recent  fiscal  period.  You may get these
reports at no cost by calling us.


WHAT IS THE DIFFERENCE BETWEEN THE FUNDS?


The funds differ in the types of  securities  that they may buy, as shown in the
table below.


Type of Security     Capital Preservation    Government Agency Money
Market
- ----------------------------------------------------------------------------
U.S. Treasury        Yes                     Yes
- ----------------------------------------------------------------------------
U.S. government
agency               No                      Yes
- ----------------------------------------------------------------------------
U.S. government
instrumentality      No                      Yes


U.S. Treasury  securities are believed to be the safest securities  because they
are supported by the  government's  full faith and credit  pledge;  (the highest
credit  quality  available) and because they are the most widely traded and most
liquid securities  investors can buy. Other types of U.S. government  securities
do not necessarily feature the full faith and credit nor the liquidity of market
that U.S.  Treasury  securities  do. On the other  hand,  other U.S.  government
securities generally have higher yields than U.S. Treasury securities.


WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUNDS?

Because very short-term  securities are among the safest  securities  available,
the  interest  they  pay is  among  the  lowest  for  income-paying  securities.
Accordingly,  the yield on these  funds  will  likely be lower  than  funds that
invest in longer-term or lower-quality securities.


10        American Century Investments                           1-800-345-2021


SHORT-TERM TREASURY FUND
INTERMEDIATE-TERM TREASURY FUND
LONG-TERM TREASURY FUN

WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES?


These funds seek the highest  level of current  income  exempt from state income
tax. The Short-Term Treasury and  Intermediate-Term  Treasury funds also seek to
maintain safety of capital.


HOW DO THE FUNDS PURSUE THEIR INVESTMENT OBJECTIVES?

The funds buy U.S. Treasury  securities  guaranteed by the direct full faith and
credit pledge of the U.S. government.


The funds also may buy securities  issued by the U.S.  government,  its agencies
and instrumentalities.  The U.S. government provides varying levels of financial
support to these agencies and instrumentalities.  Each fund may invest up to 35%
of its total assets in these  securities.  In  addition,  the funds can buy only
U.S. government securities with income that is exempt from state income tax.

The funds may purchase  securities in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions,   the  funds  may  purchase  securities  in  advance  to  generate
additional income.

Additional information about the funds' investments is available in their annual
and  semiannual  reports.  In these  reports you will find a  discussion  of the
market  conditions and investment  strategies  that  significantly  affected the
funds'  performance  during the most  recent  fiscal  period.  You may get these
reports at no cost by calling us.


WHAT IS THE DIFFERENCE BETWEEN THE FUNDS?


The funds  differ in the maturity of the debt  securities  they  purchase.  This
difference is shown in the chart below.

                                  Weighted Average Maturity Range
- --------------------------------------------------------------------------------
Short-Term Treasury               13 months-3 years
- --------------------------------------------------------------------------------
Intermediate-Term Treasury        3-10 years
- --------------------------------------------------------------------------------
Long-Term Treasury                10-30 years


WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUNDS?

The funds have different weighted average maturities. Because of this, the funds
will  respond  differently  to  changes in  interest  rates.  Funds with  longer
weighted  average  maturities are more sensitive to interest rate changes.  When
interest  rates rise,  the values of the funds usually  fall,  but the values of
funds with longer weighted average maturities generally will fall farther.

The funds' share values will fluctuate.  In general,  the funds that have higher
potential  income  have a higher  potential  loss.  If you sell your shares when
their value is less than the price you paid, you will lose money.

                                Potential Income                Potential Loss
- --------------------------------------------------------------------------------
Short-Term Treasury             Lower                           Lower
- --------------------------------------------------------------------------------
Intermediate-Term Treasury      Moderate                        Moderate
- --------------------------------------------------------------------------------
Long-Term Treasury              Higher                          Higher


www.americancentury.com                    American Century Investments  11


INFLATION-ADJUSTED TREASURY FUND

WHAT IS THE FUND'S INVESTMENT OBJECTIVE?


Inflation-Adjusted   Treasury  seeks  total  return  and  inflation   protection
consistent with investment in U.S. Treasury inflation-adjusted securities.


HOW DOES THE FUND PURSUE ITS INVESTMENT OBJECTIVE?

The fund buys  inflation-indexed  U.S.  Treasury  securities  guaranteed  by the
direct   full  faith  and   credit   pledge  of  the  U.S.   government.   These
inflation-indexed securities are designed to protect the future purchasing power
of the money invested in them.


The  fund  also  may buy  traditional  U.S.  Treasury  securities  that  are not
inflation-indexed.  The fund also may buy inflation-indexed securities issued by
U.S. government agencies and  government-sponsored  organizations.  The fund may
invest up to 35% of its total assets in these securities.


The fund may purchase  securities  in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions, the fund may purchase securities in advance to generate additional
income.


Additional  information about the fund's  investments is available in its annual
and  semiannual  reports.  In these  reports you will find a  discussion  of the
market  conditions and investment  strategies  that  significantly  affected the
fund's  performance  during the most  recent  fiscal  period.  You may get these
reports at no cost by calling us.


WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUND?


Inflation-indexed securities are designed to offer a return linked to inflation,
which   protects   future   purchasing   power  from   effects   of   inflation.
Inflation-indexed    securities   may   not   trade   at   their   face   value.
Inflation-indexed  securities  trade at  prevailing  real,  or after  inflation,
interest  rates.  Changes in real interest  rates affect the fund's share value.
Generally,  when real interest  rates rise, the fund's share value will decline.
The opposite is true when interest rates  decline.  This real interest rate risk
is higher for  Inflation-Adjusted  Treasury than for funds that do not invest in
inflation-indexed securities.

As  with  all  funds,   at  any  given   time  the  value  of  your   shares  of
Inflation-Adjusted  Treasury  may be worth more or less than the price you paid.
If you sell your shares when the value is less than the price you paid, you will
lose money.



12     American Century Investments                            1-800-345-2021


SHORT-TERM GOVERNMENT FUND

WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

Short-Term  Government  seeks high current  income while  maintaining  safety of
principal.

HOW DOES THE FUND PURSUE ITS INVESTMENT OBJECTIVE?


The fund buys short-term securities issued by the U.S. government,  its agencies
and instrumentalities, including mortgage-backed securities. The U.S. government
provides   varying   levels  of   financial   support  to  these   agencies  and
instrumentalities.  The fund also may buy short-term  U.S.  Treasury  securities
guaranteed by the direct full faith and credit pledge of the U.S. government.

The fund may purchase  securities  in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions, the fund may purchase securities in advance to generate additional
income.

The weighted average maturity of the fund is expected to be three years or Less.

Additional  information about the fund's  investments is available in its annual
and  semiannual  reports.  In these  reports you will find a  discussion  of the
market  conditions and investment  strategies  that  significantly  affected the
fund's  performance  during the most  recent  fiscal  period.  You may get these
reports at no cost by calling us.

WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUND?

Interest rate changes  affect the fund's share value.  Generally,  when interest
rates rise,  the fund's  share  value will  decline.  The  opposite is true when
interest  rates  decline.  This  interest  rate  risk is higher  for  Short-Term
Government than for funds that have shorter weighted average maturities, such as
money market funds.

Short-Term  Government  invests in mortgage-backed  securities.  When homeowners
refinance their mortgages to take advantage of declining  interest rates,  their
existing  mortgages  are  prepaid.  The  mortgages,  which  back the  securities
purchased by Short-Term  Government,  may be prepaid in this fashion.  When this
happens,  the fund will be required to purchase new securities at current market
rates,  which will usually be lower.  Because of this prepayment  risk, the fund
may benefit less from declining interest rates than other short-term funds.

As with all  funds,  at any given  time the value of your  shares of  Short-Term
Government  may be worth more or less than the price you paid.  If you sell your
shares when the value is less than the price you paid, you will lose money.


www.americancentury.com                   American Century Investments   13


GNMA FUND

WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

GNMA Fund seeks high current  income while  maintaining  liquidity and safety of
principal by investing primarily in GNMA certificates.

HOW DOES THE FUND PURSUE ITS INVESTMENT OBJECTIVE?

The fund primarily buys certificates  issued by the Government National Mortgage
Association (GNMA).  Unlike many other  mortgage-backed  securities,  the timely
payment of principal and interest on these  certificates  is guaranteed by GNMA.
GNMA's  payment  guarantee  is  stronger  than most other  government  agencies'
because it is backed by the full faith and credit of the U.S.  government.  This
means that the fund  receives  its share of payments  regardless  of whether the
ultimate borrowers make their payments.

The  fund  also  may  buy  short-term  U.S.  government  securities.   The  U.S.
government,  its agencies and  instrumentalities  issue these securities.  These
securities include mortgage-backed  securities.  The U.S. government's financial
support of these agencies and instrumentalities varies.

The fund may purchase  securities  in a number of different  ways to seek higher
rates of  return.  For  example,  the fund may  purchase  securities  in advance
through when-issued and forward commitment transactions.

The weighted average maturity of the fund is expected to be three years or Less.

Additional  information about the fund's  investments is available in its annual
and  semiannual  reports.  In these reports you will find a discussion of market
conditions  and investment  strategies  that  significantly  affected the fund's
performance  during the most recent fiscal period.  You may get these reports at
no cost by calling us.

WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUND?

When interest rates change, the fund's share value will be affected.  Generally,
when interest rates rise,  the fund's share value will decline.  The opposite is
true when  interest  rates  decline.  This interest rate risk is higher for GNMA
Fund than for funds that have shorter weighted average maturities, such as money
market funds.

GNMA Fund invests in mortgage-backed securities. When homeowners refinance their
mortgages  to  take  advantage  of  declining  interest  rates,  their  existing
mortgages are prepaid.  The mortgages,  which back the  securities  purchased by
GNMA Fund, may be prepaid in this fashion.  Because of this prepayment risk, the
fund may benefit less from declining interest rates than other short-term funds.

As with all funds,  at any given time the value of your  shares of GNMA Fund may
be worth more or less than the price you paid.  If you sell your shares when the
value is less than the price you paid, you will lose money.


14     American Century Investments                             1-800-345-2021


BASICS OF FIXED-INCOME INVESTING

DEBT SECURITIES

When a fund buys a debt security,  which is also called a fixed-income security,
it is  essentially  lending money to the issuer of the security.  Notes,  bonds,
commercial paper and Treasury bills are examples of debt  securities.  After the
debt  security is first sold by the  issuer,  it may be bought and sold by other
investors.  The price of the  security  may rise or fall based on many  factors,
including changes in interest rates, inflation, liquidity and credit quality.


The fund managers decide which debt securities to buy and sell by

* determining which securities help a fund meet its maturity requirements

* eliminating securities that do not satisfy a fund's credit quality standards

* evaluating the current economic conditions and assessing the risk of
  inflation

* evaluating special features of the securities that may make them more or less
  attractive

WEIGHTED AVERAGE MATURITY

Like most loans,  debt  securities  eventually must be repaid (or refinanced) at
some date.  This date is called the maturity  date. The number of days left to a
debt  security's  maturity date is called the remaining  maturity.  The longer a
debt  security's  remaining  maturity,  the more  sensitive  it is to changes in
interest rates.


Because a bond fund will own many debt securities,  the fund managers  calculate
the average of the remaining  maturities of all of the debt  securities the fund
owns to evaluate the interest rate  sensitivity  of the entire  portfolio.  This
average is weighted according to the size of the fund's individual  holdings and
is called WEIGHTED AVERAGE MATURITY. The following chart shows how fund managers
would  calculate  the weighted  average  maturity for a fund that owned only two
debt securities.


                     Amount of        Percent of   Remaining      Weighted
                     Security Owned   Portfolio    Maturity       Maturity
- ----------------------------------------------------------------------------
Debt Security A      $100,000         25%           1,000 days      250 days
- ----------------------------------------------------------------------------
Debt Security B      $300,000         75%          10,000 days    7,500 days
- ----------------------------------------------------------------------------
Weighted Average Maturity                                         7,750 days

TYPES OF RISK

The basic types of risk that the funds face are described below.

Interest Rate Risk


Generally,  interest  rates and the prices of debt  securities  move in opposite
directions.  When interest rates fall, the prices of most debt securities  rise;
when interest  rates rise,  prices fall.  Because the funds invest  primarily in
debt securities, changes in interest rates will affect the funds' performance.

The degree to which interest rate changes affect a fund's performance varies and
is related to the weighted  average  maturity of a particular fund. For example,
when  interest  rates rise,  you can expect the share value of a long-term  bond
fund to fall more than that of a  short-term  bond fund.  When rates  fall,  the
opposite is true.  This  sensitivity to interest rate changes is called interest
rate risk.


[left margin]

WEIGHTED  AVERAGE  MATURITY is a tool that the fund managers use to  approximate
the remaining maturity of a fund's investment portfolio.

[graphic of pointing index finger]
The longer a fund's  weighted  average  maturity,  the more  sensitive  it is to
changes in interest rates.


www.americancentury.com                   American Century Investments  15


When interest rates change, longer maturity bonds experience a greater change in
price.  The following  table shows the effect of a 1% increase in interest rates
on the price of 7% coupon bonds of differing maturities:


Remaining Maturity   Current Price   Price after 1% Increase   Change in Price
- ------------------------------------------------------------------------------
1 year               $100.00         $99.06                     -0.94%
- ------------------------------------------------------------------------------
3 years              $100.00         $97.38                     -2.62%
- ------------------------------------------------------------------------------
10 years             $100.00         $93.20                     -6.80%
- ------------------------------------------------------------------------------
30 years             $100.00         $88.69                     -11.31%


Credit Risk


Credit risk is the risk that an obligation won't be paid and a loss will result.
A high  credit  rating  indicates  a high  degree of  confidence  by the  rating
organization  that  the  issuer  will  be able to  withstand  adverse  business,
financial or economic  conditions,  and be able to make  interest and  principal
payments on time.  Generally,  a lower credit rating indicates a greater risk of
non-payment.  A lower rating also may indicate that the issuer has a more senior
series of debt  securities,  which  means that if the  issuer  has  difficulties
making  its  payments,  the  more  senior  series  of debt is  first in line for
payment.

It's not as simple as buying the  highest-rated  debt securities.  Higher credit
ratings   usually  mean  lower  interest  rates,  so  investors  often  purchase
securities that aren't the highest rated to increase return. If a fund purchases
lower-rated securities, it has assumed additional credit risk.


Liquidity Risk


Debt securities can become  difficult to sell, or less liquid,  for a variety of
reasons,  such as lack of an active trading market.  The chance that a fund will
have liquidity issues is called liquidity risk.


Inflation Risk


The safest investments usually have the lowest potential income and performance.
However,  returns  from  these  investments  may fail to  significantly  outpace
inflation.  Even if the value of your  investment has not gone down,  your money
will  not  be  worth  as  much  as  if  there  had  been  no   inflation.   Your
after-inflation return may be quite small. This risk is called inflation risk.


[left margin]


[graphic of pointing  index finger]
Credit quality may be lower when the issuer has
* a high debt level
* a short operating history
* a senior level of debt
* a difficult, competitive environment
* a less stable cash flow



16    American Century Investments                             1-800-345-2021


A COMPARISON OF BASIC RISK FACTORS

The  following  chart  depicts the basic risks of investing in the funds.  It is
designed to help you compare  these funds with each other;  it shouldn't be used
to compare these funds with other mutual funds.

                      Interest                                         Inflation
                      Rate Risk   Credit Risk   Liquidity Risk         Risk
- --------------------------------------------------------------------------------
Capital
Preservation          Lowest       Very Low      Similar (Very Low)     Lowest


Government Agency
Money Market          Lowest       Very Low      Similar (Very Low)     Lowest


Short-Term
Treasury              Low          Very Low      Similar (Very Low)     Low

Intermediate-Term
Treasury              Moderate     Very Low      Similar (Very Low)     Moderate


Long-Term Treasury    High         Very Low      Similar (Very Low)     Highest

Inflation-Adjusted
Treasury              Moderate     Very Low      Similar (Very Low)     Low


Short-Term
Government            Low          Low           Similar (Very Low)     Low

GNMA Fund             High         Very Low      Similar (Very Low)     High

The funds  engage in a variety of  investment  techniques  as they pursue  their
investment objectives. Each technique has its own characteristics,  and may pose
some  level of risk to the funds.  If you would  like to learn more about  these
techniques,  you should review the Statement of  Additional  Information  before
making an investment.


www.americancentury.com                      American Century Investments  17


MANAGEMENT

WHO MANAGES THE FUNDS?

The Board of  Trustees,  investment  advisor and fund  management  team play key
roles in the management of the funds.

THE BOARD OF TRUSTEES

The Board of Trustees  oversees the  management  of the funds and meets at least
quarterly  to  review  reports  about  fund  operations.  Although  the Board of
Trustees does not manage the funds, it has hired an investment advisor to do so.
More than two-thirds of the trustees are independent of the funds' advisor; that
is, they are not employed by and have no financial interest in the advisor.

THE INVESTMENT ADVISOR

The funds' investment  advisor is American Century Investment  Management,  Inc.
The advisor has been  managing  mutual  funds  since 1958.  American  Century is
headquartered at 4500 Main Street, Kansas City, Missouri 64111.

The advisor is responsible  for managing the investment  portfolios of the funds
and directing the purchase and sale of their investment securities.  The advisor
also arranges for transfer agency,  custody and all other services necessary for
the funds to operate.


For the  services it provided to the funds  during the most recent  fiscal year,
the  advisor  received a unified  management  fee based on a  percentage  of the
average net assets of the Investor  Class  shares of the funds.  The rate of the
management fee for a fund is determined on a class-by-class  basis monthly using
a two-step  formula that takes into account the fund's  strategy  (money market,
bond or equity) and the total amount of mutual fund assets the advisor manages.

The Statement of Additional  Information contains detailed information about the
calculation  of the  management  fee.  Out of that  fee,  the  advisor  paid all
expenses of managing and operating the funds except brokerage  expenses,  taxes,
interest, fees and expenses of the independent trustees (including legal counsel
fees), and extraordinary  expenses.  A portion of the management fee may be paid
by the funds' advisor to  unaffiliated  third parties who provide  recordkeeping
and administrative services that would otherwise be performed by an affiliate of
the advisor.

Management Fees Paid by the Funds to the Advisor as a Percentage of Average Net
Assets  for the Most Recent Fiscal Year Ended March 31, 1999
- --------------------------------------------------------------------------------
Capital Preservation                                                   0.47%
- --------------------------------------------------------------------------------
Government Agency Money Market                                         0.47%
- --------------------------------------------------------------------------------
Short-Term Treasury                                                    0.51%
- --------------------------------------------------------------------------------
Intermediate-Term Treasury                                             0.51%
- --------------------------------------------------------------------------------
Long-Term Treasury                                                     0.51%
- --------------------------------------------------------------------------------
Inflation-Adjusted Treasury                                            0.51%
- --------------------------------------------------------------------------------
Short-Term Government                                                  0.59%
- --------------------------------------------------------------------------------
GNMA Fund                                                              0.59%



18     American Century Investments                             1-800-345-2021


THE FUND MANAGEMENT TEAMS

The advisor uses teams of portfolio  managers,  assistant portfolio managers and
analysts to manage the funds.  Teams meet regularly to review portfolio holdings
and to discuss purchase and sale activity.  Team members buy and sell securities
for a fund as they  see fit,  guided  by the  fund's  investment  objective  and
strategy.


The portfolio managers who lead each team are identified below:


Capital Preservation

Government Agency Money Market

DENISE TABACCO


Ms.  Tabacco,  Portfolio  Manager has been a member of the Capital  Preservation
team since May 1996 and a member of the  Government  Agency  Money  Market  team
since May 1996. She joined  American  Century in 1988,  becoming a member of its
portfolio department in 1991. She has a bachelor's degree in accounting from San
Diego State University and an MBA in finance from Golden Gate University.

BETH BUNNELL HUNTER

Ms.  Hunter,  Portfolio  Manager,  has been a member  of the teams  that  manage
Capital  Preservation and Government  Agency Money Market since joining American
Century in July 1999.  Before joining American  Century,  she worked for Calvert
Asset Management Company as a Portfolio Trading Analyst from 1994 to 1996 and as
a Portfolio  Manager from 1996 to June 1999. She has a bachelor of arts from the
University of Washington, Seattle.


GNMA

CASEY C. COLTON


Mr. Colton, Vice President and Portfolio Manager,  has been a member of the GNMA
team since January 1994. Mr. Colton joined American  Century in 1990. He holds a
bachelor's degree in business  administration from San Jose State University and
a master's degree from the University of Southern California.  He is a Chartered
Financial Analyst and a Certified Public Accountant.


Intermediate-Term Treasury

ROBERT V. GAHAGAN


Mr.  Gahagan,  Vice  President and Portfolio  Manager,  has been a member of the
Intermediate-Term  Treasury team since January 1998. He joined American  Century
in  1983.  He  holds a  bachelor's  degree  in  economics  and an MBA  from  the
University of Missouri - Kansas City.


Short-Term Treasury

Short-Term Government

NEWLIN RANKIN


Mr.  Rankin,  Vice  President  and Portfolio  Manager,  has been a member of the
Short-Term  Treasury team since March 1996 and the  Short-Term  Government  team
since January 1995. He joined American  Century in 1994.  Previously,  he was an
Assistant  Vice  President at Wells Fargo Bank. He holds a bachelor's  degree in
management sciences and an MBA from the University of San Francisco.


[left margin]

[graphic of pointing index finger]
CODE OF ETHICS
American  Century has a Code of Ethics  designed to ensure that the interests of
fund  shareholders come before the interests of the people who manage the funds.
Among other  provisions,  the Code of Ethics  prohibits  portfolio  managers and
other investment  personnel from buying securities in an initial public offering
or from  profiting  from the  purchase and sale of the same  security  within 60
calendar days. In addition,  the Code of Ethics requires  portfolio managers and
other  employees  with  access  to  information  about the  purchase  or sale of
securities by the funds to obtain approval before executing  permitted  personal
trades.


www.americancentury.com                   American Century Investments  19


Long-Term Treasury

Inflation-Adjusted Treasury

DAVID W. SCHROEDER


Mr.  Schroeder,  Vice President and Portfolio  Manager,  supervises the American
Century  Government  Income  Trust  team and has been a member of the  Long-Term
Treasury  team since  September  1992 and the  Inflation-Adjusted  Treasury team
since its  inception in February  1997. He joined  American  Century in 1990. He
holds a bachelor of arts degree from Pomona College.

FUNDAMENTAL INVESTMENT POLICIES

Fundamental  investment  policies  contained  in  the  Statement  of  Additional
Information  and the  investment  objectives  of the  funds  may not be  changed
without a shareholder  vote. The Board of Trustees may change any other policies
and investment strategies.

YEAR 2000 ISSUES

Many of the world's  computer  systems were originally  programmed in a way that
prevented   them  from  properly   recognizing   or  processing   date-sensitive
information  relating to the Year 2000 and beyond.  Because  this may impact the
computer  systems of various  American  Century-affiliated  and external service
providers  for the  funds,  American  Century  formally  initiated  a Year  2000
readiness  project in July 1997.  It involves a team of  information  technology
professionals  assisted  by outside  consultants  and  guided by a  senior-level
steering committee.  The team's goal is to assess the impact of the Year 2000 on
American Century's systems,  renovate or replace  noncompliant  critical systems
and test  those  systems.  In  addition,  the team has been  working  to  gather
information  about the Year 2000  efforts  of the  funds'  other  major  service
providers.

Although  American Century believes its critical systems will function  properly
in the Year 2000, this is not guaranteed.  If the efforts of American Century or
its  external  service  providers  are  not  successful,  the  funds'  business,
particularly the provision of shareholder services, may be hampered.

In  addition,  the  issuers  of  securities  the funds own could  have Year 2000
computer problems. Foreign issuers, especially those in emerging markets, may be
more  susceptible  to such  problems than U.S.  issuers.  These  problems  could
negatively  affect the value of the issuers'  securities,  which, in turn, could
impact the funds'  performance.  The advisor has established a process to gather
publicly  available  information about the Year 2000 readiness of these issuers.
However,  this  process  may  not  uncover  all  relevant  information,  and the
information  gathered may not be complete and  accurate.  Moreover,  an issuer's
Year 2000  readiness is only one of many factors the fund  managers may consider
when making investment decisions, and other factors may receive greater weight.



20    American Century Investments                             1-800-345-2021


INVESTING WITH AMERICAN CENTURY

SERVICES AUTOMATICALLY AVAILABLE TO YOU

You  automatically  will have access to the services  listed below when you open
your account.  If you do not want these services,  see  "Conducting  Business in
Writing" below.

CONDUCTING BUSINESS IN WRITING

If you prefer to conduct  business in writing only, you can indicate this on the
account  application.  If you  choose  this  option,  you must  provide  written
instructions  to invest,  exchange  and  redeem.  All  account  owners must sign
transaction  instructions (with signatures  guaranteed for redemptions in excess
of $100,000).  If you want to add services  later,  you can complete an Investor
Service Options form.

WAYS TO MANAGE YOUR ACCOUNT
- --------------------------------------------------------------------------------
BY TELEPHONE
Investor Relations
1-800-345-2021

Business, Not-For-Profit and
Employer-Sponsored
Retirement Plans
1-800-345-3533

Automated Information Line
1-800-345-8765

[graphic of telephone]

OPEN AN ACCOUNT


If you are a current investor, you can open an account by exchanging shares from
another American Century account.


EXCHANGE SHARES

Call us or use our  Automated  Information  Line if you  have  authorized  us to
accept telephone instructions.

MAKE ADDITIONAL INVESTMENTS

Call us or use our  Automated  Information  Line if you  have  authorized  us to
invest from your bank account.

SELL SHARES

Call an Investor Relations Representative.

- --------------------------------------------------------------------------------
BY MAIL OR FAX
P.O. Box 419200
Kansas City, MO 64141-6200

Fax
816-340-7962

[graphic of envelope]

OPEN AN ACCOUNT


Send a  signed,  completed  application  and  check or money  order  payable  to
American Century Investments.


EXCHANGE SHARES

Send us written  instructions to exchange your shares from one American  Century
account to another.

MAKE ADDITIONAL INVESTMENTS

Send us your check or money  order for at least $50 with an  investment  slip or
$250 without an investment slip. If you don't have an investment  slip,  include
your name, address and account number on your check or money order.

SELL SHARES


Send us  written  instructions  or a  redemption  form to sell  shares.  Call an
Investor Relations Representative to request a form.


- --------------------------------------------------------------------------------
ONLINE
www.americancentury.com

OPEN AN ACCOUNT


If you are a current investor, you can open an account by exchanging shares from
another American Century account.


EXCHANGE SHARES

Exchange shares from another American Century account.

MAKE ADDITIONAL INVESTMENTS

Make an additional  investment into an established  American  Century account if
you have authorized us to invest from your bank account.

SELL SHARES

Not available.


www.americancentury.com                   American Century Investments   21


A NOTE ABOUT MAILINGS TO SHAREHOLDERS

To reduce  expenses and show respect for our  environment,  we will deliver most
financial reports, prospectuses and account statements to households in a single
envelope,  even if the accounts are registered  under  different  names.  If you
would like additional  copies of financial  reports and prospectuses or separate
mailing of account statements, please call us.

YOUR GUIDE TO SERVICES AND POLICIES

When you open an account,  you will receive a services guide, which explains the
services available to you and the policies of the fund and the transfer agent.

- --------------------------------------------------------------------------------
BY WIRE

[graphic  of  pointing  index  finger]  Please  remember  that  if  you  request
redemptions  by wire, $10 will be deducted from the amount  redeemed.  Your bank
also may charge a fee.

[graphic of wire machine]

OPEN AN ACCOUNT


Call us to set up your  account or mail a completed  application  to the address
provided in the "By mail" section and give your bank the following information

* Our bank information:
     Commerce Bank N.A.
     Routing No. 101000019
     Account No. 2804918
* The fund name
* Your American Century account number+
* Your name
* The contribution year (for IRAs only)
+ For additional investments only


MAKE ADDITIONAL INVESTMENTS


Follow the wire instructions provided in the "Open an account" section.


SELL SHARES


You can receive redemption proceeds by wire or electronic transfer.


EXCHANGE SHARES


Not available.


- --------------------------------------------------------------------------------
AUTOMATICALLY

[graphic of arrows in circle]

OPEN AN ACCOUNT

Not available.

EXCHANGE SHARES


Send us written instructions to set up an automatic exchange of your shares from
one American Century account to another.



MAKE ADDITIONAL INVESTMENTS


With the automatic  investment  privilege,  you can purchase shares on a regular
basis. You must invest at least $600 per year per account.


SELL SHARES


If you have at least $10,000 in your account,  you may sell shares automatically
by establishing Check-A-Month or Automatic Redemption plans.


- --------------------------------------------------------------------------------
IN PERSON

[graphic of human figure]


If you prefer to handle your  transactions in person,  visit one of the Investor
Centers  listed  below.  A  representative  can help you open an  account,  make
additional investments, and sell or exchange shares.

4500 Main St.
Kansas City, Missouri
8 a.m. to 5 p.m., Monday - Friday


1665 Charleston Road
Mountain View, California
8:30 a.m. to 5 p.m., Monday - Friday

4917 Town Center Drive
Leawood, Kansas
8 a.m. to 6 p.m., Monday - Friday
8 a.m. to noon, Saturday


9445 East County Line Road, Suite A
Englewood, Colorado
8 a.m. to 6 p.m., Monday - Friday
8 a.m. to noon, Saturday



22   American Century Investments                         1-800-345-2021


MINIMUM INITIAL INVESTMENT AMOUNTS


To open an account, the minimum investments are:
- --------------------------------------------------------------------------------
Individual or Joint                                         $2,500
- --------------------------------------------------------------------------------
Traditional IRA                                             $1,000
- --------------------------------------------------------------------------------
Roth IRA                                                    $1,000
- --------------------------------------------------------------------------------
Education IRA                                               $500
- --------------------------------------------------------------------------------
UGMA/UTMA                                                   $2,500
- --------------------------------------------------------------------------------
403(b)                                                      No minimum
- --------------------------------------------------------------------------------
Qualified Retirement Plans                                  $2,500*


* The  minimum  investment  requirements  may be  different  for  some  types of
retirement accounts.

REDEMPTION OF SHARES IN LOW-BALANCE ACCOUNTS

If your  redemption  activity  causes  your  account  balance  to fall below the
minimum initial  investment  amount,  we will notify you and give you 90 days to
meet the minimum. If you do not meet the deadline,  American Century will redeem
the shares in the account and send the proceeds to your address of record.

ABUSIVE TRADING PRACTICES

We do not permit market timing or other abusive trading practices in our funds.


Excessive,  short-term  (market timing) or other abusive  trading  practices may
disrupt portfolio management  strategies and harm fund performance.  To minimize
harm to the funds and their  shareholders,  we  reserve  the right to reject any
purchase order (including  exchanges) from any investor we believe has a history
of  abusive  trading  or  whose  trading,  in our  judgment,  has been or may be
disruptive to a fund. In making this judgment,  we may consider  trading done in
multiple  accounts under common ownership or control.  We also reserve the right
to delay delivery of your redemption proceeds -- up to seven days -- or to honor
certain redemptions with securities,  rather than cash, as described in the next
section.


SPECIAL REQUIREMENTS FOR LARGE REDEMPTIONS


If,  during any 90-day  period,  you redeem fund shares worth more than $250,000
(or 1% of the assets of the fund if that percentage is less than  $250,000),  we
reserve  the right to pay part or all of the  redemption  proceeds  in excess of
this amount in readily marketable securities instead of cash. If we make payment
in securities, we will value the securities selected by the fund managers in the
same manner as we do in  computing  the fund's net asset  value.  We may provide
these securities in lieu of cash without prior notice.


If your  redemption  would  exceed  this limit and you would like to avoid being
paid in  securities,  please  provide us with an  unconditional  instruction  to
redeem at least 15 days prior to the date on which the redemption transaction is
to occur.  The instruction must specify the dollar amount or number of shares to
be redeemed and the date of the  transaction.  This  minimizes the effect of the
redemption on the fund and its remaining shareholders.


www.americancentury.com                   American Century Investments   23



INVESTING THROUGH FINANCIAL INTERMEDIARIES


If you do business  with us through a  financial  intermediary  or a  retirement
plan,  your ability to purchase,  exchange and redeem  shares will depend on the
policies of that entity. Some policy differences may include

* minimum investment requirements

* exchange policies

* fund choices

* cutoff time for investments


Please  contact  your  financial  intermediary  or plan  sponsor  for a complete
description  of its policies.  Copies of the funds' annual  reports,  semiannual
reports  and  Statement  of  Additional  Information  are  available  from  your
intermediary or plan sponsor.


Certain  financial   intermediaries  perform  recordkeeping  and  administrative
services  for their  clients  that would  otherwise  be  performed  by  American
Century's transfer agent. In some  circumstances,  American Century will pay the
service provider a fee for performing those services.

Although  transactions in fund shares may be made directly with American Century
at no charge,  you also may purchase,  redeem and exchange  fund shares  through
financial  intermediaries that charge a transaction-based or other fee for their
services. Those charges are retained by the intermediary and are not shared with
American Century or the funds.

American Century has contracts with certain financial  intermediaries  requiring
them to track  the time  investment  orders  are  received  and to  comply  with
procedures  relating to the  transmission  of orders.  The funds have authorized
those  intermediaries  to accept  orders on their behalf up to the time at which
the net asset value is determined.  If those orders are  transmitted to American
Century and paid for in accordance with the contract, they will be priced at the
net asset  value next  determined  after your  request is  received  in the form
required by the intermediary on a fund's behalf.

[left margin]

[graphic of pointing index finger]
Financial intermediaries include banks, broker-dealers,  insurance companies and
investment advisors.


24     American Century Investments                             1-800-345-2021


SHARE PRICE AND DISTRIBUTIONS

SHARE PRICE

American  Century  determines  the NET ASSET  VALUE (NAV) of the funds as of the
close of regular trading on the New York Stock Exchange  (usually 4 p.m. Eastern
time)  each day the  Exchange  is open.  On days when the  Exchange  is not open
(including  certain U.S.  holidays),  we do not  calculate the NAV. The NAV of a
fund share is the current  value of the fund's  assets,  minus any  liabilities,
divided by the number of fund shares outstanding.


If current market prices of securities  owned by non-money  market funds are not
readily available, the advisor may determine their fair value in accordance with
procedures adopted by the funds' Board of Trustees.  The portfolio securities of
the money  market  funds are  valued at  amortized  cost.  This  means  that the
securities are initially valued at their cost when purchased.  After the initial
purchase,  the  difference  between  the  purchase  price and the known value at
maturity will be reduced at a constant rate until maturity.  This valuation will
be used  regardless  of the impact of interest  rates on the market value of the
security.  The Board has adopted  procedures to ensure that this type of pricing
is fair to the funds' shareholders.


We will price your purchase,  exchange or redemption at the NAV next  determined
after we receive your transaction request in good order.

DISTRIBUTIONS

Federal tax laws require each fund to make  distributions to its shareholders in
order  to  qualify  as a  "regulated  investment  company."  Qualification  as a
regulated investment company means that the fund will not be subject to state or
federal income tax on amounts distributed.  The distributions  generally consist
of dividends and interest  received,  as well as CAPITAL  GAINS  realized on the
sale of investment securities.


Each money market fund  declares  and  reinvests  distributions  from net income
daily. Each of the other funds declares  distributions from net income daily and
pays these  distributions  monthly.  Each fund (except the money  market  funds)
generally pays  distributions  of capital gains,  if any, once a year usually in
December. A fund may make more frequent  distributions,  if necessary, to comply
with   Internal   Revenue  Code   provisions.   Distributions   are   reinvested
automatically in additional shares unless you choose another option.


You will participate in fund distributions,  when they are declared, starting on
the day after your purchase is effective. For example, if you purchase shares on
a day that a distribution is declared,  you will not receive that  distribution.
If you redeem shares, you will receive any distribution  declared on the day you
redeem.  If you redeem all shares,  we will include any  distributions  received
with your redemption proceeds.

Participants in employer-sponsored retirement or savings plans must reinvest all
distributions.  For shareholders  investing  through taxable  accounts,  we will
reinvest  distributions unless you elect to receive them in cash. Please consult
your services guide for further  information  regarding  distributions  and your
distribution options.

[left margin]

The NET ASSET VALUE of a fund is the price of the fund's shares.

CAPITAL GAINS are increases in the values of capital assets, such as stock, from
the time the assets are  purchased.  Tax  becomes  due on capital  gains once an
asset is sold.


www.americancentury.com                   American Century Investments   25


TAXES

The tax  consequences  of  owning  shares of the funds  will vary  depending  on
whether you own them through a taxable or tax-deferred account. Tax consequences
result from distributions by the funds of dividend and interest income they have
received  or  capital  gains  they  have  generated   through  their  investment
activities.  Tax consequences also result from sales of fund shares by investors
after the net asset value has increased or decreased.

Tax-Deferred Accounts

If you purchase fund shares through a tax-deferred  account, such as an IRA or a
qualified  employer-sponsored  retirement  or savings  plan,  income and capital
gains  distributions  usually will not be subject to current taxation,  but will
accumulate in your account  under the plan on a  tax-deferred  basis.  Likewise,
moving  from one fund to  another  fund  within a plan or  tax-deferred  account
generally  will  not  cause  you to be  taxed.  For  information  about  the tax
consequences of making  purchases or withdrawals  through an  employer-sponsored
retirement  or  savings  plan,  or  through  an IRA,  please  consult  your plan
administrator, your summary plan description or a professional tax advisor.

Taxable Accounts

If you own fund shares through a taxable account,  distributions by the fund and
sales by you of fund shares may cause you to be taxed.

Taxability of Distributions

Fund distributions may consist of income earned by the fund from sources such as
dividends  and  interest,  or  capital  gains  generated  from  the sale of fund
investments. Distributions of income are taxed as ordinary income. Distributions
of capital gains are classified  either as short term or long term and are taxed
as follows:


Type of Distribution       Tax Rate for 15% Bracket    Tax Rate for 28% Bracket
                                                            or Above
- -------------------------------------------------------------------------------
Short-term capital gains   Ordinary income rate        Ordinary income rate
- -------------------------------------------------------------------------------
Long-term capital gains    10%                         20%

The tax status of any  distributions  of capital gains is determined by how long
the fund held the  underlying  security that was sold,  not by how long you have
been  invested  in the  fund or  whether  you  reinvest  your  distributions  in
additional  shares or take them in cash.  American Century will send you the tax
status of fund  distributions  for each  calendar  year in an annual tax mailing
(Form 1099-DIV) from each fund.


Distributions  also may be subject to state and local taxes.  Because everyone's
tax situation is unique,  always  consult your tax  professional  about federal,
state and local tax consequences.

Taxes on Transactions


Your  redemptions -- including  exchanges to other American Century funds -- are
subject to capital  gains tax.  The table above can provide a general  guide for
your potential tax liability when selling or exchanging fund shares.  Short-term
capital gains are gains on fund shares you held for 12 months or less. Long-term
capital gains are gains on fund shares you held for more than 12 months. If your
shares  decrease in value,  their sale or exchange will result in a long-term or
short-term  capital loss.  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
gains  to you  with  respect  to  such  shares.  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.  If you have not certified to us that your
Social Security number or tax identification  number is correct and that you are
not subject to 31% withholding, we are required to withhold and remit to the IRS
31% of dividends, capital gains distributions and redemptions.


[left margin]

[graphic of pointing index finger]
BUYING A DIVIDEND

Purchasing  fund shares in a taxable  account  shortly before a distribution  is
sometimes known as buying a dividend.  In taxable accounts,  you must pay income
taxes on the  distribution  whether you reinvest the  distribution or take it in
cash. In addition,  you will have to pay taxes on the  distribution  whether the
value of your  investment  decreased,  increased  or remained the same after you
bought the fund shares.

The risk in buying a dividend  is that a fund's  portfolio  may build up taxable
gains throughout the period covered by a distribution, as securities are sold at
a profit. We distribute those gains to you, after  subtracting any losses,  even
if you did not own the shares when the gains occurred.

If you buy a  dividend,  you incur the full tax  liability  of the  distribution
period,  but you may not enjoy the full  benefit  of the gains  realized  in the
fund's portfolio.


26    American Century Investments                             1-800-345-2021


MULTIPLE CLASS INFORMATION

American Century offers two classes of the funds: Investor Class and Advisor
Class. The shares offered by this Prospectus are Investor Class shares and have
no up-front or deferred charges, commissions or 12b-1 fees. Capital Preservation
offers only an Investor Class of shares.

American  Century  offers the other class of shares  primarily to  institutional
investors    through    institutional    distribution    channels,    such    as
employer-sponsored  retirement  plans,  or  through  banks,  broker-dealers  and
insurance companies. The other class has different fees, expenses and/or minimum
investment  requirements  than the Investor  Class.  The  difference  in the fee
structures between the classes is the result of their separate  arrangements for
shareholder  and  distribution  services and not the result of any difference in
amounts  charged  by  the  advisor  for  core  investment   advisory   services.
Accordingly,  the  core  investment  advisory  expenses  do not  vary by  class.
Different fees and expenses will affect performance.  For additional information
concerning the other classes of shares not offered by this  Prospectus,  call us
at  1-800-345-3533  for  Advisor  Class  shares.  You also can  contact  a sales
representative or financial intermediary who offers that class of shares.


Except as  described  below,  all classes of shares of the funds have  identical
voting,  dividend,   liquidation  and  other  rights,  preferences,   terms  and
conditions.  The only differences  between the classes are (a) each class may be
subject to  different  expenses  specific  to that  class;  (b) each class has a
different  identifying  designation or name; (c) each class has exclusive voting
rights with respect to matters solely  affecting such class;  and (d) each class
may have different exchange privileges.



www.americancentury.com                   American Century Investments   27


FINANCIAL HIGHLIGHTS

UNDERSTANDING THE FINANCIAL HIGHLIGHTS

The tables on the next few pages  itemize  what  contributed  to the  changes in
share  price  during the  period.  They also show the changes in share price for
this period in comparison to changes over the last five fiscal years.

On a per-share basis, each table includes as appropriate

* share price at the beginning of the period

* investment income and capital gains or losses

* distributions of income and capital gains paid to shareholders

* share price at the end of the period

Each table also includes some key statistics for the period as appropriate

* TOTAL RETURN -- the overall percentage of return of the fund, assuming
  the reinvestment of all distributions

* EXPENSE RATIO -- operating expenses as a percentage of average net assets

* NET INCOME RATIO -- net investment income as a percentage of average net
  asset

* PORTFOLIO TURNOVER -- the percentage of the fund's buying and selling
  activity


The  Financial  Highlights  for the fiscal  years ended March 31, 1998 and 1999,
have been audited by PricewaterhouseCoopers LLP, independent accountants.  Their
report is included  in the funds'  annual  reports,  which are  incorporated  by
reference into the Statement of Additional  Information,  and are available upon
request.  Prior years'  information was audited by other  independent  auditors,
whose report also is  incorporated by reference into the Statement of Additional
Information.



28    American Century Investments                                1-800-345-2021


<TABLE>
<CAPTION>

CAPITAL PRESERVATION FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                1999             1998           1997           1996          1995
- ------------------------------------------------------------------------------------------------------------------
<S>                                            <C>              <C>            <C>            <C>           <C>
Net Asset Value, Beginning of Year ......      $1.00            $1.00          $1.00          $1.00         $1.00
                                              -------          -------        --------       -------       -------

Income From Investment Operations
    Net Investment Income ...............       0.05             0.05           0.05           0.05          0.04
                                              -------          -------        --------       -------       -------
Distributions
    From Net Investment Income ..........     (0.05)           (0.05)         (0.05)         (0.05)        (0.04)
                                              -------          -------        --------       -------       -------
Net Asset Value, End of Year ............      $1.00            $1.00          $1.00          $1.00         $1.00
                                              =======          =======        ========       =======       =======
    Total Return(1) .....................      4.72%            5.06%          4.82%          5.21%         4.31%

RATIOS/SUPPLEMENTAL DATA
 ........................................       1999             1998           1997           1996          1995
- ------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses to
Average Net Assets(2) ...................      0.48%            0.49%          0.49%          0.51%         0.50%

Ratio of Net Investment Income to
Average Net Assets ......................      4.53%            4.90%          4.66%          5.07%         4.24%

Net Assets, End of Year (in thousands) .. $3,324,805       $3,144,584     $2,978,015     $3,077,558    $2,883,350


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.

(2) The  ratios  for years  ended  March 31,  1997 and March 31,  1996,  include
expenses paid through expense offset arrangements.


www.americancentury.com                  American Century Investments  29


GOVERNMENT AGENCY MONEY MARKET FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                               1999           1998           1997           1996         1995
- ---------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year ......      $1.00          $1.00          $1.00          $1.00        $1.00
                                              -------        -------        -------        -------      -------
Income From Investment Operations
     Net Investment Income ..............       0.05           0.05           0.05           0.05         0.04
                                              -------        -------        -------        -------      -------
Distributions
     From Net Investment Income .........     (0.05)         (0.05)         (0.05)         (0.05)       (0.04)
                                              -------        -------        -------        -------      -------
Net Asset Value, End of Year ............      $1.00          $1.00          $1.00          $1.00        $1.00
                                              =======        =======        =======        =======      =======
     Total Return(1) ....................      4.91%          5.14%          4.89%          5.35%        4.47%

RATIOS/SUPPLEMENTAL DATA

                                               1999           1998           1997           1996         1995
- ----------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses to
Average Net Assets(2) ...................      0.48%          0.51%          0.57%          0.51%        0.50%

Ratio of Net Investment Income to
Average Net Assets ......................      4.79%          5.02%          4.76%          5.20%        4.35%

Net Assets, End of Year (in thousands) ..   $527,842       $487,791       $470,759       $503,328     $461,803


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.

(2) The  ratios  for years  ended  March 31,  1997 and March 31,  1996,  include
expenses paid through expense offset arrangements.


30  American Century Investments                             1-800-345-2021


SHORT-TERM TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                  1999           1998            1997           1996          1995
- --------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year ........      $9.80          $9.68           $9.84          $9.73         $9.86
                                                -------        -------         -------        -------       --------

Income From Investment Operations
    Net Investment Income .................       0.49           0.53            0.52           0.53          0.50

    Net Realized and Unrealized Gain
    (Loss) on Investment Transactions .....       0.05           0.12          (0.07)           0.11        (0.13)
                                                -------        -------         -------        -------       --------
    Total From Investment Operations ......       0.54           0.65            0.45           0.64          0.37
                                                -------        -------         -------        -------       --------
Distributions
    From Net Investment Income ............     (0.49)         (0.53)          (0.52)         (0.53)        (0.50)

    From Net Realized Gains
    on Investment Transactions ............         --             --          (0.09)            --           --
                                                -------        -------         -------        -------       --------
    Total Distributions ...................     (0.49)         (0.53)          (0.61)         (0.53)        (0.50)
                                                -------        -------         -------        -------       --------
Net Asset Value, End of Year ..............      $9.85          $9.80           $9.68          $9.84         $9.73
                                                =======        =======         =======        =======       ========
    Total Return(1) .......................      5.60%          6.89%           4.62%          6.71%         3.85%

RATIOS/SUPPLEMENTAL DATA

                                                  1999           1998            1997           1996          1995
- --------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets .....................      0.51%          0.55%           0.61%          0.67%         0.67%

Ratio of Net Investment Income
to Average Net Assets .....................      4.92%          5.45%           5.26%          5.39%         5.22%

Portfolio Turnover Rate ...................       138%           140%            234%           224%          141%

Net Assets, End of Year
(in thousands) ............................    $61,783        $40,874         $35,854        $35,648       $56,090


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.


www.americancentury.com                   American Century Investments  31


INTERMEDIATE-TERM TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                   1999            1998            1997           1996        1995
- ---------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year ...........   $10.56          $10.06          $10.24        $  9.99        $10.18
                                                --------        --------        --------       --------      --------
Income From Investment Operations
   Net Investment Income .....................     0.54            0.59            0.58           0.58          0.53

   Net Realized and Unrealized Gain (Loss)
   on Investment Transactions ................     0.10            0.50          (0.18)           0.25        (0.19)
                                                --------        --------        --------       --------      --------
   Total From Investment Operations ..........     0.64            1.09            0.40           0.83          0.34
                                                --------        --------        --------       --------      --------
Distributions
   From Net Investment Income ................   (0.54)          (0.59)          (0.58)         (0.58)        (0.53)

   From Net Realized Gains
   on Investment Transactions ................   (0.21)            --              --             --            --
                                                --------        --------        --------       --------      --------
   Total Distributions .......................   (0.75)          (0.59)          (0.58)         (0.58)        (0.53)
                                                --------        --------        --------       --------      --------
Net Asset Value, End of Year .................   $10.45          $10.56          $10.06         $10.24       $ 9.99
                                                ========        ========        ========       ========      ========
   Total Return(1) ...........................    6.09%          11.04%           4.05%          8.42%         3.54%

RATIOS/SUPPLEMENTAL DATA

                                                   1999            1998            1997           1996         1995
- ---------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets ........................    0.51%           0.51%           0.51%          0.53%        0.53%

Ratio of Net Investment Income
to Average Net Assets ........................    5.01%           5.63%           5.72%          5.65%        5.35%

Portfolio Turnover Rate ......................     221%         194%(2)            110%           168%          92%

Net Assets, End of Year
(in thousands) ............................... $435,494        $374,861        $328,784       $311,020     $305,353


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.

(2) Purchases,  sales and market value amounts for Intermediate-Term  Government
prior to the merger were excluded from the portfolio turnover calculation.


32  American Century Investments                             1-800-345-2021


LONG-TERM TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                 1999           1998           1997          1996           1995
- ------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year ..........  $10.58        $  9.32          $9.67         $9.05          $9.38
                                              --------       --------        -------       -------       -------
Income From Investment Operations
    Net Investment Income ...................    0.58           0.61           0.60          0.60           0.60

    Net Realized and Unrealized Gain (Loss)
    on Investment Transactions ..............    0.11           1.26         (0.35)          0.62         (0.33)
                                              --------       --------        -------       -------       -------
    Total From Investment Operations ........    0.69           1.87           0.25          1.22           0.27
                                              --------       --------        -------       -------       -------
Distributions
    From Net Investment Income ..............  (0.58)         (0.61)         (0.60)        (0.60)         (0.60)

    From Net Realized Gains
    on Investment Transactions ..............  (0.52)           --             --            --             --

    In Excess of Net Realized Gains .........  (0.05)           --             --            --             --
                                              --------       --------        -------       -------       -------
    Total Distributions .....................  (1.15)         (0.61)         (0.60)        (0.60)         (0.60)
                                              --------       --------        -------       -------       -------
Net Asset Value, End of Year ................  $10.12         $10.58          $9.32         $9.67          $9.05
                                              ========       ========        =======       =======       =======
    Total Return(1) .........................   6.33%         20.48%          2.65%        13.46%          3.25%

RATIOS/SUPPLEMENTAL DATA

                                                 1999           1998           1997          1996           1995
- ------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets .......................   0.51%          0.54%          0.60%         0.67%          0.67%

Ratio of Net Investment Income
to Average Net Assets .......................   5.37%          6.00%          6.28%         5.93%          6.84%

Portfolio Turnover Rate .....................    105%            57%            40%          112%           147%

Net Assets, End of Year
(in thousands) ..............................$137,552       $103,381       $126,570      $110,741        $34,906


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.


www.americancentury.com                   American Century Investments  33


SHORT-TERM GOVERNMENT FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                              1999      1998(1)          1997          1996          1995      1994
- ---------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period .....   $9.46        $9.49         $9.47         $9.51         $9.27     $9.67
                                            -------     -------        -------       -------       -------    -------
Income From Investment Operations
    Net Investment Income ................    0.49         0.21          0.52          0.51          0.52     0.40

    Net Realized and Unrealized Gain
    (Loss) on Investment Transactions ....    0.01       (0.03)          0.02        (0.04)          0.24     (0.40)
                                            -------     -------        -------       -------       -------    -------
    Total From Investment Operations .....    0.50         0.18          0.54          0.47          0.76       --
                                            -------     -------        -------       -------       -------    -------
Distributions
    From Net Investment Income ...........  (0.49)       (0.21)        (0.52)        (0.51)        (0.52)     (0.40)
                                            -------     -------        -------       -------       -------    -------
Net Asset Value, End of Period ...........   $9.47        $9.46         $9.49         $9.47         $9.51     $9.27
                                            =======     =======        =======       =======       =======    =======
    Total Return(2) ......................   5.39%        1.95%         5.86%         5.09%         8.42%     0.07%

RATIOS/SUPPLEMENTAL DATA

                                              1999      1998(1)          1997          1996          1995     1994
- ----------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets ....................   0.59%     0.59%(3)         0.68%         0.70%         0.70%     0.81%

Ratio of Net Investment Income to
Average Net Assets .......................   5.15%     5.43%(3)         5.53%         5.39%         5.53%     4.17%

Portfolio Turnover Rate ..................    196%          54%       293%(4)          246%          128%     470%

Net Assets, End of Period
(in thousands) ...........................$832,344     $808,464      $519,332      $349,772      $391,331     $396,753

(1) The fund's fiscal year end was changed from October 31 to March 31 resulting
in a five month  reporting  period.  For years ended  prior to 1998,  the fund's
fiscal year end was October 31.

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

(3) Annualized.

(4)  Purchases,  sales and the market value of securities  for  Adjustable  Rate
Government  Securities  prior to the merger  were  excluded  from the  portfolio
turnover calculation.


34  American Century Investments                             1-800-345-2021


GNMA FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                 1999            1998           1997          1996          1995
- -------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year ........    $10.67          $10.33         $10.45        $10.18         $10.35
                                              --------        --------       --------      --------        --------
Income From Investment Operations
   Net Investment Income ..................      0.64            0.69           0.71          0.74           0.72

   Net Realized and Unrealized Gain
   (Loss) on Investment Transactions ......    (0.05)            0.34         (0.12)          0.27          (0.18)
                                              --------        --------       --------      --------        --------
   Total From Investment Operations .......      0.59            1.03           0.59          1.01           0.54
                                              --------        --------       --------      --------        --------
Distributions
   From Net Investment Income .............    (0.64)          (0.69)         (0.71)        (0.74)          (0.71)
                                              --------        --------       --------      --------        --------
Net Asset Value, End of Year ..............    $10.62          $10.67         $10.33        $10.45         $10.18
                                              ========        ========       ========      ========        ========
   Total Return(1) ........................     5.66%          10.21%          5.84%        10.08%           5.53%

RATIOS/SUPPLEMENTAL DATA

                                                 1999            1998           1997          1996           1995
- -------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets(2) ..................     0.59%           0.58%          0.55%         0.58%           0.58%

Ratio of Net Investment Income
to Average Net Assets .....................     5.98%           6.49%          6.84%         6.98%           7.08%

Portfolio Turnover Rate ...................      119%            133%           105%           64%            120%

Net Assets, End of Year
(in thousands) ............................$1,415,607      $1,285,641     $1,119,165    $1,120,019       $979,670


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.

(2) The  ratios  for years  ended  March 31,  1997 and March 31,  1996,  include
expenses paid through expense offset arrangements.


www.americancentury.com                   American Century Investments  35


INFLATION-ADJUSTED TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31 (except as noted)

PER-SHARE DATA

                                                              1999             1998         1997(1)
- ----------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period ..................      $9.63            $9.74          $10.00
                                                            -------          -------        --------
Income From Investment Operations
    Net Investment Income .............................       0.47             0.44            0.06

    Net Realized and Unrealized Loss
    on Investment Transactions ........................     (0.15)           (0.11)          (0.26)
                                                            -------          -------        --------
    Total From Investment Operations ..................       0.32             0.33          (0.20)
                                                            -------          -------        --------
Distributions
    From Net Investment Income ........................     (0.47)           (0.44)          (0.06)
                                                            -------          -------        --------
Net Asset Value, End of Period ........................      $9.48            $9.63         $  9.74
                                                            =======          =======        ========
    Total Return(2) ...................................      3.37%            3.45%         (1.98)%

RATIOS/SUPPLEMENTAL DATA

                                                              1999             1998
1997(1)
- -----------------------------------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets .....      0.49%            0.50%        0.50%(3)

Ratio of Net Investment Income to Average Net Assets ..      4.84%            4.45%        5.03%(3)

Portfolio Turnover Rate ...............................       127%              69%             --

Net Assets, End of Period (in thousands) ..............     $8,980           $5,279          $2,277


(1) February 10, 1997 (inception) through March 31, 1997.

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

(3) Annualized.
</TABLE>


36   American Century Investments                             1-800-345-2021



NOTES



www.americancentury.com                   American Century Investments  37


[back cover]

MORE INFORMATION ABOUT THE FUNDS IS CONTAINED IN THESE DOCUMENTS

Annual and Semiannual Reports

These reports  contain more  information  about the funds'  investments  and the
market  conditions and investment  strategies  that  significantly  affected the
funds' performance during the most recent fiscal period.

Statement of Additional Information (SAI)

The SAI contains a more detailed,  legal  description of the funds'  operations,
investment  restrictions,  policies and practices.  The SAI is  incorporated  by
reference  into this  Prospectus.  This means  that it is  legally  part of this
Prospectus, even if you don't request a copy.


You may obtain a free copy of the SAI or annual and semiannual reports,  and ask
any questions about the funds or your accounts,  by contacting  American Century
at the address or telephone numbers listed below.


You also can get  information  about  the  funds  (including  the SAI)  from the
Securities and Exchange Commission (SEC).

* In person                SEC Public Reference Room
                           Washington, D.C.
                           Call 1-800-SEC-0330 for location
                           and hours.

* On the Internet          www.sec.gov

* By mail                  SEC Public Reference Section
                           Washington, D.C. 20549-6009
                           (The SEC will charge a fee for copying
                           the documents.)

Investment Company Act File No. 811-4363

                        [american century logo (reg. sm)]
                                    American
                                    Century

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

                         1-800-345-2021 or 816-531-5575

9908
SH-PRS-16702
<PAGE>
[front cover]

                               AMERICAN CENTURY

                                  Prospectus


                                            Government Agency Money Market Fund

                                                       Short-Term Treasury Fund

                                                Intermediate-Term Treasury Fund

                                                        Long-Term Treasury Fund


                                               Inflation-Adjusted Treasury Fund


                                                     Short-Term Government Fund


                                                                      GNMA Fund


                                               [american century logo (reg. sm)]
                                                                        American
                                                                         Century

[left margin]

                                                                 August 1, 1999
                                                                  ADVISOR CLASS

   THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THESE
SECURITIES OR DETERMINED IF THIS PROSPECTUS IS ACCURATE OR COMPLETE. ANYONE WHO
                   TELLS YOU OTHERWISE IS COMMITTING A CRIME.

                     Distributed by Funds Distributor, Inc.


Dear Investor,

   Reading a prospectus  doesn't have to be a chore. We've done the hard work so
you can focus on what's  important--learning  about the funds and tracking  your
investments. Take a look inside, and you'll see this prospectus is different. It
takes a clear-cut approach to fund information.

   Here's what you'll find:

   * The funds' primary investments and risks

   * A description of who may or may not want to invest in the funds

   * Fund performance, including returns for each year, best and worst quarters,
     and average annual returns compared to the funds' benchmarks

   * An overview of services available and ways to manage your accounts

   * Helpful tips and definitions of key investment terms

   Whether you're a current  investor or investing in mutual funds for the first
time, this prospectus will give you a clear  understanding  of the funds. If you
have questions,  our Service Representatives are available weekdays, 8 a.m. to 5
p.m., Central time. Our toll-free number is  1-800-345-3533.  We look forward to
helping you achieve your financial goals.



                                Sincerely,


                                /s/Mark Killen

                                Mark Killen
                                Senior Vice President
                                American Century Investment Services, Inc.

[left margin]

[american century logo (reg. sm)]
American
Century


                               American Century
                                  Investments

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




TABLE OF CONTENTS


An Overview of the Funds ..................................................    2
Fund Performance History ..................................................    3
Fees and Expenses .........................................................    5
Information about the Funds ...............................................    6
   Government Agency Money Market Fund ....................................    6
   Short-Term Treasury Fund
   Intermediate-Term Treasury Fund
   Long-Term Treasury Fund ................................................    7
   Inflation-Adjusted Treasury Fund .......................................    8
   Short-Term Government Fund .............................................    9
   GNMA Fund ..............................................................   10
Basics of Fixed-Income Investing ..........................................   11
Management ................................................................   14
Investing with American Century ...........................................   17
Share Price and Distributions .............................................   19
Taxes .....................................................................   20
Multiple Class Information ................................................   21
Financial Highlights ......................................................   22
Performance Information of Other Class ....................................   29


[left margin]

Throughout  this  book  you'll  find  definitions  of key  investment  terms and
phrases.  When you see a word printed in GREEN ITALICS,  look for its definition
in the left margin.

[graphic of pointing index finger] This symbol  highlights  special  information
and helpful tips.


                                                    American Century Investments



AN OVERVIEW OF THE FUNDS


WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES?

These funds seek income and investment returns by investing in various types of
U.S. government securities.


WHAT ARE THE FUNDS' PRIMARY INVESTMENT STRATEGIES AND PRINCIPAL RISKS?


The funds  invest  most of their  assets in DEBT  SECURITIES  issued by the U.S.
government  or its  agencies  or  instrumentalities.  The chart  below shows the
primary  differences  among the funds.  A more  detailed  description  about the
funds' investment strategies and risks begins on page 6.

Fund                   Primary Investments             Principal Risks
- --------------------------------------------------------------------------------
Government Agency      Very short-term U.S.           Very low credit risk
Money Market           government securities          Lowest interest rate risk
                                                      Lowest inflation risk
- --------------------------------------------------------------------------------
Short-Term             U.S. Treasury securities       Low interest rate risk
Treasury               that mature in three           Low inflation risk
                       years or less
- --------------------------------------------------------------------------------
Intermediate-Term      U.S. Treasury securities       Interest rate risk
Treasury               that mature in three           Inflation risk
                       years or more
- --------------------------------------------------------------------------------
Long-Term Treasury    U.S. Treasury securities        High interest rate risk
                      that mature in 10 years         High inflation risk
                      or more
- --------------------------------------------------------------------------------
Short-Term            U.S. government securities      Some credit risk
Government            that mature in three years      Low interest rate risk
                      or less                         Low inflation risk
- --------------------------------------------------------------------------------
GNMA Fund             Ginnie Maes, which are          Interest rate risk
                      mortgage-backed securities      Low credit risk
                      issued by Government National   High inflation risk
                      Mortgage Association
- --------------------------------------------------------------------------------
Inflation-Adjusted    Inflation-indexed U.S.          Interest rate risk
Treasury              Treasury securities             Low inflation risk

As with all funds, at any given time the value of your shares of the fund may be
worth more or less than the price you paid. If you sell shares when the value is
less than the price you paid, you will lose money.


WHO MAY WANT TO INVEST IN THE FUNDS?

The funds may be a good investment if you

* are seeking current income

* prefer a relatively safe investment over one that may provide better long-term
  investment returns


* are seeking diversification by investing in a fixed-income mutual fund


* are comfortable with the funds' other investment risks

WHO MAY NOT WANT TO INVEST IN THE FUNDS?

The funds may not be a good investment if you are

* investing for long-term growth

* looking for the added security of FDIC insurance

[left margin]

DEBT  SECURITIES  include   fixed-income   investments  such  as  notes,  bonds,
commercial paper and Treasury bills.


[graphic of pointing index finger]
An  investment  in the funds is not a bank  deposit,  and it is not  insured  or
guaranteed  by the Federal  Deposit  Insurance  Corporation  (FDIC) or any other
government agency.  Although the money market fund (Government  Agency) seeks to
preserve the value of your investment at $1.00 per share, it is possible to lose
money by investing in it.



2  American Century Investments                             1-800-345-3533


FUND PERFORMANCE HISTORY


GOVERNMENT AGENCY MONEY MARKET FUND
LONG-TERM TREASURY FUND
INFLATION-ADJUSTED
TREASURY FUND
SHORT-TERM GOVERNMENT FUND

When the Advisor  Class of a fund has  investment  results  for a full  calendar
year, this section will feature charts that show

* Annual Total Returns

* Highest and Lowest Quarterly Returns

* Average Annual Returns, including a comparison of these returns to a benchmark
  index for the Advisor Class of the fund

In addition,  investors can examine the performance of the fund's Investor Class
of shares. The Investor Class has a total expense ratio that is 0.25% lower than
the  Advisor  Class.  If the  Advisor  Class  had  existed  during  the  periods
presented,  its  performance  would  have been lower  because of the  additional
expense.

All past  performance  information is designed to help show you how fund returns
can vary. Keep in mind that past performance does not predict how the funds will
perform in the future.

Performance Information of Other Class

The  original  class  of  shares  of the  funds  was  the  Investor  Class.  For
information  about the  historical  performance of the original class of shares,
see page 29.

[graphic of pointing index finger]
For current performance  information,  please call us at 1-800-345-3533 or visit
American Century's Web site at www.americancentury.com.



www.americancentury.com                    American Century Investments  3


FUND PERFORMANCE HISTORY

SHORT-TERM TREASURY FUND
INTERMEDIATE-TERM TREASURY FUND
GNMA FUND

Annual Total Returns(1)

The  following  bar chart shows the  performance  of the funds'  Investor  Class
shares for each of the last 10 calendar  years or for each full year in the life
of the fund if less than 10 years.  It indicates  the  volatility  of the funds'
historical returns from year to year.

[bar chart data shown below]

                                1998
Short-Term Treasury            6.17%
Intermediate-Term Treasury     8.67%
GNMA                           6.06%


(1) As of June 30, 1999, the end of the most recent calendar quarter, the funds'
year-to-date   returns  were  Short-Term  Treasury,   0.45%,   Intermediate-Term
Treasury, -2.55%; and GNMA, -0.15%.


The highest and lowest  quarterly  returns for the period  reflected  in the bar
chart are:


                                Highest                     Lowest
- --------------------------------------------------------------------------------
Short-Term Treasury             2.87% (3Q 1998)             -0.03% (2Q 1999)
- --------------------------------------------------------------------------------
Intermediate-Term Treasury      5.76% (3Q 1998)             -1.29% (1Q 1999)
- --------------------------------------------------------------------------------
GNMA                            2.31% (3Q 1998)             -0.90% (2Q 1999)


Average Annual Returns

The following table shows the average annual returns of the funds' Advisor Class
shares for the periods indicated. The benchmarks are unmanaged indices that have
no operating costs and are included in the table for performance comparison.



For the calendar year ended December 31, 1998     1 year       Life of Fund(1)
- --------------------------------------------------------------------------------
Short-Term Treasury                               6.17%            6.01%
Salomon 1- to 3-Year
   Treasury/Agency Index(2)                       6.98%            6.80%(3)
Lehman 1- to 3-Year Government
   Securities Index                               6.96%            6.78%(3)
- --------------------------------------------------------------------------------
Intermediate-Term Treasury                        8.67%            9.19%
Salomon 3- to 10-Year Treasury Index             10.21%            9.84%(3)
- --------------------------------------------------------------------------------
GNMA                                              6.06%            6.52%
Salomon 30-Year GNMA Index                        6.82%            6.92%(3)

(1) The inception dates for the funds are:  Intermediate-Term Treasury and GNMA,
October 9, 1997; and Short-Term Treasury, October 6, 1997.

(2) The fund's  benchmark was changed because the Salomon Index provides a daily
breakdown of its individual  bond holdings and their prices.  This change allows
us much more accurate  tracking of the benchmark and more exact  modeling of the
fund's portfolio.

(3) Benchmark from October 31, 1997.

Performance Information of Other Class

The original class of shares of the fund was the Investor  Class of shares.  For
information  about the  historical  performance of the original class of shares,
see page 29.


[left margin]

[graphic of pointing index finger]
The  performance  information  on this page is designed to help you see how fund
returns can vary.  Keep in mind that past  performance  does not predict how the
funds will perform in the future.


[graphic of pointing index finger]
For current performance  information,  please call us at 1-800-345-3533 or visit
American Century's Web site at www.americancentury.com.



4   American Century Investments                             1-800-345-3533


FEES AND EXPENSES

There are no sales loads, fees or other charges

* to buy fund shares directly from American Century

* to reinvest dividends in additional shares

* to exchange into the Advisor Class shares of other American Century funds

* to redeem your shares

The following table describes the fees and expenses that you will pay if you buy
and hold shares of the funds.

ANNUAL OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)


                                  Distribution                    Total Annual
                     Management   and Service       Other         Fund Operating
                     Fee(1)       (12b-1) Fees(2)   Expenses(2)   Expenses
- -----------------------------------------------------------------------------
Government Agency
Money Market         0.22%        0.50%             0.00%         0.72%
- -----------------------------------------------------------------------------
Short-Term
Treasury             0.26%        0.50%             0.00%         0.76%
- -----------------------------------------------------------------------------
Intermediate-Term
Treasury             0.26%        0.50%             0.00%         0.76%
- -----------------------------------------------------------------------------
Long-Term
Treasury             0.26%        0.50%             0.00%         0.76%
- -----------------------------------------------------------------------------
Inflation-Adjusted
Treasury             0.26%        0.50%             0.00%         0.76%
- -----------------------------------------------------------------------------
Short-Term
Government           0.34%        0.50%             0.00%         0.84%
- -----------------------------------------------------------------------------
GNMA Fund            0.34%        0.50%             0.00%         0.84%

(1) Based on expenses  incurred  during the funds' most recent fiscal year.  The
funds have stepped fee schedules.  As a result,  the funds'  management fee rate
generally decreases as fund assets increase.

(2) The 12b-1 fee is designed to permit  investors  to  purchase  Advisor  Class
shares through  broker-dealers,  banks,  insurance companies and other financial
intermediaries.  A portion  of the fee is used to  compensate  them for  ongoing
recordkeeping and  administrative  services that would otherwise be performed by
an  affiliate  of the  advisor,  and a portion  is used to  compensate  them for
distribution  and other  shareholder  services.  See "Service  and  Distribution
Fees," page 21.

(3)  Other  expenses,  which  include  the  fees  and  expenses  of  the  funds'
independent trustees,  their legal counsel and interest, are expected to be less
than 0.005% for the current fiscal year.


Example

The examples in the table below are intended to help you compare the costs of
investing in a fund with the costs of investing in other mutual funds. Assuming
you ...

* invest $10,000 in the fund

* redeem all of your shares at the end of the periods shown below

* earn a 5% return each year

* incur the same operating expenses as shown above

 ... your cost of investing in the fund would be:


                                   1 year    3 years     5 years    10 years
- ----------------------------------------------------------------------------
Government Agency Money Market     $73       $230        $400       $892
- ----------------------------------------------------------------------------
Short-Term Treasury                $78       $242        $422       $939
- ----------------------------------------------------------------------------
Intermediate-Term Treasury         $78       $242        $422       $939
- ----------------------------------------------------------------------------
Long-Term Treasury                 $78       $242        $422       $939
- ----------------------------------------------------------------------------
Inflation-Adjusted Treasury        $78       $242        $422       $939
- ----------------------------------------------------------------------------
Short-Term Government              $86       $268        $465       $1,034
- ----------------------------------------------------------------------------
GNMA Fund                          $86       $268        $465       $1,034



[left margin]

[graphic of pointing index finger]
Use this example to compare the costs of  investing  in other funds.  Of course,
your actual costs may be higher or lower.


www.americancentury.com                    American Century Investments  5



INFORMATION ABOUT THE FUNDS


GOVERNMENT AGENCY MONEY MARKET FUND


WHAT ARE THE FUND'S INVESTMENT OBJECTIVES?


The fund is a money  market fund that seeks  maximum  safety and  liquidity  and
seeks to pay  shareholders  the  highest  rate of  return  consistent  with this
objective.  In addition,  Government  Agency Money Market seeks to purchase only
those securities with income that will be exempt from state income tax.

HOW DOES THE FUND PURSUE ITS INVESTMENT OBJECTIVES?

The fund buys very short-term U.S. Treasury securities that are guaranteed by
the direct full faith and credit pledge of the U.S. government.

Government Agency Money Market also buys other very short-term securities issued
by the U.S. government, its agencies and instrumentalities. The U.S. government
provides varying levels of financial support to these agencies and
instrumentalities.

The fund may purchase  securities  in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions, the fund may purchase securities in advance to generate additional
income.


Additional  information about the fund's  investments is available in its annual
and  semiannual  reports.  In these reports you will find a discussion of market
conditions  and investment  strategies  that  significantly  affected the fund's
performance  during the most recent fiscal period.  You may get these reports at
no cost by calling us.


WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUND?

Because very short-term  securities are among the safest  securities  available,
the  interest  they  pay is  among  the  lowest  for  income-paying  securities.
Accordingly,  the yield on this fund will likely be lower than funds that invest
in longer-term or lower-quality securities.


6   American Century Investments                             1-800-345-3533


SHORT-TERM TREASURY FUND
INTERMEDIATE-TERM TREASURY FUND
LONG-TERM TREASURY FUN

WHAT ARE THE FUNDS' INVESTMENT OBJECTIVES?


These funds seek the highest  level of current  income  exempt from state income
tax. The Short-Term Treasury and  Intermediate-Term  Treasury funds also seek to
maintain safety of capital.


HOW DO THE FUNDS PURSUE THEIR INVESTMENT OBJECTIVES?

The funds buy U.S. Treasury  securities  guaranteed by the direct full faith and
credit pledge of the U.S. government.


The funds also may buy securities  issued by the U.S.  government,  its agencies
and instrumentalities.  The U.S. government provides varying levels of financial
support to these agencies and instrumentalities.  Each fund may invest up to 35%
of its total assets in these  securities.  In  addition,  the funds can buy only
U.S. government securities with income that is exempt from state income tax.

The funds may purchase  securities in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions,   the  funds  may  purchase  securities  in  advance  to  generate
additional income.

Additional information about the funds' investments is available in their annual
and  semiannual  reports.  In these  reports you will find a  discussion  of the
market  conditions and investment  strategies  that  significantly  affected the
funds'  performance  during the most  recent  fiscal  period.  You may get these
reports at no cost by calling us.


WHAT IS THE DIFFERENCE BETWEEN THE THREE FUNDS?


The funds  differ in the maturity of the debt  securities  they  purchase.  This
difference is shown in the chart below.


                                   Weighted Average Maturity Range
- --------------------------------------------------------------------------------
Short-Term Treasury                13 months-3 years
- --------------------------------------------------------------------------------
Intermediate-Term Treasury         3-10 years
- --------------------------------------------------------------------------------
Long-Term Treasury                 20-30 years

WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUNDS?

The funds have different weighted average maturities. Because of this, the funds
will  respond  differently  to  changes in  interest  rates.  Funds with  longer
weighted  average  maturities are more sensitive to interest rate changes.  When
interest  rates rise,  the values of the funds usually  fall,  but the values of
funds with longer weighted average maturities generally will fall farther.

The funds' share values will fluctuate.  In general,  the funds that have higher
potential  income  have a higher  potential  loss.  If you sell your shares when
their value is less than the price you paid, you will lose money.

                                Potential Income              Potential Loss
- ----------------------------------------------------------------------------
Short-Term Treasury             Lower                         Lower
- ----------------------------------------------------------------------------
Intermediate-Term Treasury      Moderate                      Moderate
- ----------------------------------------------------------------------------
Long-Term Treasury              Higher                        Higher


www.americancentury.com                    American Century Investments   7


INFLATION-ADJUSTED TREASURY FUND

WHAT IS THE FUND'S INVESTMENT OBJECTIVE?


Inflation-Adjusted   Treasury  seeks  total  return  and  inflation   protection
consistent with investment in U.S. Treasury inflation-adjusted securities.


HOW DOES THE FUND PURSUE ITS INVESTMENT OBJECTIVE?

The fund buys  inflation-indexed  U.S.  Treasury  securities  guaranteed  by the
direct   full  faith  and   credit   pledge  of  the  U.S.   government.   These
inflation-indexed securities are designed to protect the future purchasing power
of the money invested in them.


The  fund  also  may buy  traditional  U.S.  Treasury  securities  that  are not
inflation-indexed.  The fund also may buy inflation-indexed securities issued by
U.S. government agencies and  government-sponsored  organizations.  The fund may
invest up to 35% of its total assets in these securities.


The fund may purchase  securities  in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions, the fund may purchase securities in advance to generate additional
income.


Additional  information about the fund's  investments is available in its annual
and  semiannual  reports.  In these reports you will find a discussion of market
conditions  and investment  strategies  that  significantly  affected the fund's
performance  during the most recent fiscal period.  You may get these reports at
no cost by calling us.


WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUND?


Inflation-indexed securities are designed to offer a return linked to inflation,
which   protects   future   purchasing   power  from   effects   of   inflation.
Inflation-indexed    securities   may   not   trade   at   their   face   value.
Inflation-indexed  securities  trade at  prevailing  real,  or after  inflation,
interest  rates.  Changes in real interest  rates affect the fund's share value.
Generally,  when real interest  rates rise, the fund's share value will decline.
The opposite is true when interest rates  decline.  This real interest rate risk
is higher for  Inflation-Adjusted  Treasury than for funds that do not invest in
inflation-indexed securities.

As  with  all  funds,   at  any  given   time  the  value  of  your   shares  of
Inflation-Adjusted  Treasury  may be worth more or less than the price you paid.
If you sell your shares when the value is less than the price you paid, you will
lose money.



8   American Century Investments                             1-800-345-3533


SHORT-TERM GOVERNMENT FUND

WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

Short-Term  Government  seeks high current  income while  maintaining  safety of
principal.

HOW DOES THE FUND PURSUE ITS INVESTMENT OBJECTIVE?


The fund buys short-term securities issued by the U.S. government,  its agencies
and instrumentalities, including mortgage-backed securities. The U.S. government
provides   varying   levels  of   financial   support  to  these   agencies  and
instrumentalities.  The fund also may buy short-term  U.S.  Treasury  securities
guaranteed by the direct full faith and credit pledge of the U.S. government.

The fund may purchase  securities  in a number of different  ways to seek higher
rates of return.  For  example,  by using  when-issued  and  forward  commitment
transactions, the fund may purchase securities in advance to generate additional
income.

The weighted average maturity of the fund is expected to be three years or less.

Additional  information about the fund's  investments is available in its annual
and  semiannual  reports.  In these reports you will find a discussion of market
conditions  and investment  strategies  that  significantly  affected the fund's
performance  during the most recent fiscal period.  You may get these reports at
no cost by calling us.

WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUND?

Interest rate changes  affect the fund's share value.  Generally,  when interest
rates rise,  the fund's  share  value will  decline.  The  opposite is true when
interest  rates  decline.  This  interest  rate  risk is higher  for  Short-Term
Government than for funds that have shorter weighted average maturities, such as
money market funds.

Short-Term  Government  invests in mortgage-backed  securities.  When homeowners
refinance their mortgages to take advantage of declining  interest rates,  their
existing  mortgages  are  prepaid.  The  mortgages,  which  back the  securities
purchased by Short-Term  Government,  may be prepaid in this fashion.  When this
happens,  the fund will be required to purchase new securities at current market
rates,  which will usually be lower.  Because of this prepayment  risk, the fund
may benefit less from declining interest rates than other short-term funds.

As with all  funds,  at any given  time the value of your  shares of  Short-Term
Government  may be worth more or less than the price you paid.  If you sell your
shares when the value is less than the price you paid, you will lose money.



www.americancentury.com                   American Century Investments   9



GNMA FUND

WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

GNMA Fund seeks high current  income while  maintaining  liquidity and safety of
principal by investing primarily in GNMA certificates.

HOW DOES THE FUND PURSUE ITS INVESTMENT OBJECTIVE?

The fund primarily buys certificates  issued by the Government National Mortgage
Association (GNMA).  Unlike many other  mortgage-backed  securities,  the timely
payment of principal and interest on these  certificates  is guaranteed by GNMA.
GNMA's  payment  guarantee  is  stronger  than most other  government  agencies'
because it is backed by the full faith and credit of the U.S.  government.  This
means that the fund  receives  its share of payments  regardless  of whether the
ultimate borrowers make their payments.

The  fund  also  may  buy  short-term  U.S.  government  securities.   The  U.S.
government,  its agencies and  instrumentalities  issue these securities.  These
securities include mortgage-backed  securities.  The U.S. government's financial
support of these agencies and instrumentalities varies.

The fund may purchase  securities  in a number of different  ways to seek higher
rates of  return.  For  example,  the fund may  purchase  securities  in advance
through when-issued and forward commitment transactions.

The weighted average maturity of the fund is expected to be three years or less.

Additional  information about the fund's  investments is available in its annual
and  semiannual  reports.  In these reports you will find a discussion of market
conditions  and investment  strategies  that  significantly  affected the fund's
performance  during the most recent fiscal period.  You may get these reports at
no cost by calling us.

WHAT ARE THE PRIMARY RISKS OF INVESTING IN THE FUND?

When interest rates change, the fund's share value will be affected.  Generally,
when interest rates rise,  the fund's share value will decline.  The opposite is
true when  interest  rates  decline.  This interest rate risk is higher for GNMA
Fund than for funds that have shorter weighted average maturities, such as money
market funds.

GNMA Fund invests in mortgage-backed securities. When homeowners refinance their
mortgages  to  take  advantage  of  declining  interest  rates,  their  existing
mortgages are prepaid.  The mortgages,  which back the  securities  purchased by
GNMA Fund, may be prepaid in this fashion.  Because of this prepayment risk, the
fund may benefit less from declining interest rates than other short-term funds

As with all funds,  at any given time the value of your  shares of GNMA Fund may
be worth more or less than the price you paid.  If you sell your shares when the
value is less than the price you paid, you will lose money.


10   American Century Investments                             1-800-345-3533


BASICS OF FIXED-INCOME INVESTING

DEBT SECURITIES

When a fund buys a debt security,  which is also called a fixed-income security,
it is  essentially  lending money to the issuer of the security.  Notes,  bonds,
commercial paper and Treasury bills are examples of debt  securities.  After the
debt  security is first sold by the  issuer,  it may be bought and sold by other
investors.  The price of the  security  may rise or fall based on many  factors,
including changes in interest rates, inflation, liquidity and credit quality.


The fund managers decide which debt securities to buy and sell by

* determining which securities help a fund meet its maturity requirements

* eliminating securities that do not satisfy a fund's credit quality standards

* evaluating the current economic conditions and assessing the risk of
  inflation

* evaluating special features of the securities that may make them more or less
  attractive

WEIGHTED AVERAGE MATURITY

Like most loans,  debt  securities  eventually must be repaid (or refinanced) at
some date.  This date is called the maturity  date. The number of days left to a
debt  security's  maturity date is called the remaining  maturity.  The longer a
debt  security's  remaining  maturity,  the more  sensitive  it is to changes in
interest rates.


Because a bond fund will own many debt securities,  the fund managers  calculate
the average of the remaining  maturities of all of the debt  securities the fund
owns to evaluate the interest rate  sensitivity  of the entire  portfolio.  This
average is weighted according to the size of the fund's individual  holdings and
is called WEIGHTED AVERAGE MATURITY. The following chart shows how fund managers
would  calculate  the weighted  average  maturity for a fund that owned only two
debt securities.


                     Amount of        Percent of   Remaining      Weighted
                     Security Owned   Portfolio    Maturity       Maturity
- ----------------------------------------------------------------------------
Debt Security A      $100,000         25%           1,000 days      250 days
- ----------------------------------------------------------------------------
Debt Security B      $300,000         75%          10,000 days    7,500 days
- ----------------------------------------------------------------------------
Weighted Average Maturity                                         7,750 days

TYPES OF RISK

The basic types of risk that the funds face are described below.

Interest Rate Risk


Generally,  interest  rates and the prices of debt  securities  move in opposite
directions.  When interest rates fall, the prices of most debt securities  rise;
when interest  rates rise,  prices fall.  Because the funds invest  primarily in
debt securities, changes in interest rates will affect the funds' performance.

The degree to which interest rate changes affect a fund's performance varies and
is related to the weighted  average  maturity of a particular fund. For example,
when  interest  rates rise,  you can expect the share value of a long-term  bond
fund to fall more than that of a  short-term  bond fund.  When rates  fall,  the
opposite is true.  This  sensitivity to interest rate changes is called interest
rate risk.


[left margin]

WEIGHTED  AVERAGE  MATURITY is a tool that the fund managers use to  approximate
the remaining maturity of a fund's investment portfolio.

[graphic of pointing index finger]
The longer a fund's  weighted  average  maturity,  the more  sensitive  it is to
changes in interest rates.


www.americancentury.com                   American Century Investments   11


When interest rates change, longer maturity bonds experience a greater change in
price.  The following  table shows the effect of a 1% increase in interest rates
on the price of 7% coupon bonds of differing maturities:


Remaining Maturity   Current Price   Price after 1% Increase   Change in Price
- ------------------------------------------------------------------------------
1 year               $100.00         $99.06                     -0.94%
- ------------------------------------------------------------------------------
3 years              $100.00         $97.38                     -2.62%
- ------------------------------------------------------------------------------
10 years             $100.00         $93.20                     -6.80%
- ------------------------------------------------------------------------------
30 years             $100.00         $88.69                     -11.31%


Credit Risk


Credit risk is the risk that an obligation won't be paid and a loss will result.
A high  credit  rating  indicates  a high  degree of  confidence  by the  rating
organization  that  the  issuer  will  be able to  withstand  adverse  business,
financial or economic  conditions,  and be able to make  interest and  principal
payments on time.  Generally,  a lower credit rating indicates a greater risk of
non-payment.  A lower rating also may indicate that the issuer has a more senior
series of debt  securities,  which  means that if the  issuer  has  difficulties
making  its  payments,  the  more  senior  series  of debt is  first in line for
payment.

It's not as simple as buying the  highest-rated  debt securities.  Higher credit
ratings   usually  mean  lower  interest  rates,  so  investors  often  purchase
securities that aren't the highest rated to increase return. If a fund purchases
lower-rated securities, it has assumed additional credit risk.


Liquidity Risk


Debt securities can become  difficult to sell, or less liquid,  for a variety of
reasons,  such as lack of an active trading market.  The chance that a fund will
have liquidity issues is called liquidity risk.


Inflation Risk


The safest investments usually have the lowest potential income and performance.
However,  returns  from  these  investments  may fail to  significantly  outpace
inflation.  Even if the value of your  investment has not gone down,  your money
will  not  be  worth  as  much  as  if  there  had  been  no   inflation.   Your
after-inflation return may be quite small. This risk is called inflation risk.


[left margin]

[graphic of pointing index finger]
Credit quality may be lower when the issuer has


* a high debt level
* a short operating history
* a senior level of debt
* a difficult, competitive environment
* a less stable cash flow



12   American Century Investments                             1-800-345-3533


A COMPARISON OF BASIC RISK FACTORS

The  following  chart  depicts the basic risks of investing in the funds.  It is
designed to help you compare  these funds with each other;  it shouldn't be used
to compare these funds with other mutual funds.


                      Interest                                         Inflation
                      Rate Risk   Credit Risk   Liquidity Risk         Risk
- --------------------------------------------------------------------------------
Government Agency
Money Market          Lowest       Very Low      Similar (Very Low)     Lowest


Short-Term
Treasury              Low          Very Low      Similar (Very Low)     Low

Intermediate-Term
Treasury              Moderate     Very Low      Similar (Very Low)     Moderate


Long-Term Treasury    High         Very Low      Similar (Very Low)     Highest

Inflation-Adjusted
Treasury              Moderate     Very Low      Similar (Very Low)     Low


Short-Term
Government            Low          Low           Similar (Very Low)     Low

GNMA Fund             High         Very Low      Similar (Very Low)     High

The funds  engage in a variety of  investment  techniques  as they pursue  their
investment objectives. Each technique has its own characteristics,  and may pose
some  level of risk to the funds.  If you would  like to learn more about  these
techniques,  you should review the Statement of  Additional  Information  before
making an investment.


www.americancentury.com                   American Century Investments   13


MANAGEMENT

WHO MANAGES THE FUNDS?

The Board of  Trustees,  investment  advisor and fund  management  team play key
roles in the management of the funds.

THE BOARD OF TRUSTEES

The Board of Trustees  oversees the  management  of the funds and meets at least
quarterly  to  review  reports  about  fund  operations.  Although  the Board of
Trustees does not manage the funds, it has hired an investment advisor to do so.
More than two-thirds of the trustees are independent of the funds' advisor; that
is, they are not employed by and have no financial interest in the advisor.

THE INVESTMENT ADVISOR

The funds' investment  advisor is American Century Investment  Management,  Inc.
The advisor has been  managing  mutual  funds  since 1958.  American  Century is
headquartered at 4500 Main Street, Kansas City, Missouri 64111.

The advisor is responsible  for managing the investment  portfolios of the funds
and directing the purchase and sale of their investment securities.  The advisor
also arranges for transfer agency,  custody and all other services necessary for
the funds to operate.


For the  services it provided to the funds  during the most recent  fiscal year,
the  advisor  received a unified  management  fee based on a  percentage  of the
average net assets of the  Advisor  Class  shares of the funds.  The rate of the
management fee for a fund is determined on a class-by-class  basis monthly using
a two-step  formula that takes into account the fund's  strategy  (money market,
bond or equity) and the total amount of mutual fund assets the advisor manages.

The Statement of Additional  Information contains detailed information about the
calculation  of the  management  fee.  Out of that  fee,  the  advisor  paid all
expenses of managing and operating the funds except brokerage  expenses,  taxes,
interest, fees and expenses of the independent trustees (including legal counsel
fees), and extraordinary expenses.

Management Fees Paid by the Funds to the Advisor as a Percentage of Average Net
Assets for the Most Recent Fiscal Year Ended March 31, 1999
- --------------------------------------------------------------------------------
Government Agency Money Market                                         0.22%
- --------------------------------------------------------------------------------
Short-Term Treasury                                                    0.26%
- --------------------------------------------------------------------------------
Intermediate-Term Treasury                                             0.26%
- --------------------------------------------------------------------------------
Long-Term Treasury                                                     0.26%
- --------------------------------------------------------------------------------
Inflation-Adjusted Treasury                                            0.26%
- --------------------------------------------------------------------------------
Short-Term Government                                                  0.34%
- --------------------------------------------------------------------------------
GNMA Fund                                                              0.34%



14   American Century Investments                             1-800-345-3533


THE FUND MANAGEMENT TEAMS

The advisor uses teams of portfolio  managers,  assistant portfolio managers and
analysts to manage the funds.  Teams meet regularly to review portfolio holdings
and to discuss purchase and sale activity.  Team members buy and sell securities
for a fund as they  see fit,  guided  by the  fund's  investment  objective  and
strategy.


The portfolio managers who lead each team are identified below:


Government Agency Money Market

DENISE TABACCO


Ms. Tabacco, Portfolio Manager, has been a member of the Government Agency Money
Market  team since May 1996.  She joined  American  Century in 1988,  becoming a
member of its  portfolio  department  in 1991.  She has a  bachelor's  degree in
accounting  from San Diego State  University  and an MBA in finance  from Golden
Gate University.

BETH BUNNELL HUNTER

Ms.  Hunter,  Portfolio  Manager,  has been a member  of the team  that  manages
Government  Agency  Money Market since  joining  American  Century in July 1999.
Before joining American Century, she worked for Calvert Asset Management Company
as a Portfolio Trading Analyst from 1994 to 1996 and as a Portfolio Manager from
1996 to June 1999. She has a bachelor of arts from the University of Washington,
Seattle.


GNMA

CASEY C. COLTON


Mr. Colton, Vice President and Portfolio Manager, has been a member of the GNMA
team since January 1994.  Mr. Colton joined American Century in 1990. He holds a
bachelor's degree in business administration from San Jose State University and
a master's degree from the University of Southern California. He is a Chartered
Financial Analyst and a  Certified Public Accountant.


Intermediate-Term Treasury

ROBERT V. GAHAGAN


Mr.  Gahagan,  Vice  President and Portfolio  Manager,  has been a member of the
Intermediate-Term  Treasury team since January 1998. He joined American  Century
in  1983.  He  holds a  bachelor's  degree  in  economics  and an MBA  from  the
University of Missouri - Kansas City.


Short-Term Treasury

Short-Term Government

NEWLIN RANKIN


Mr.  Rankin,  Vice  President  and Portfolio  Manager,  has been a member of the
Short-Term  Treasury team since March 1996 and the  Short-Term  Government  team
since January 1995. He joined American  Century in 1994.  Previously,  he was an
Assistant  Vice  President at Wells Fargo Bank. He holds a bachelor's  degree in
management sciences and an MBA from the University of San Francisco.


Long-Term Treasury

Inflation-Adjusted Treasury

DAVID W. SCHROEDER


Mr.  Schroeder,  Vice President and Portfolio  Manager,  supervises the American
Century  Government  Income  Trust  team and has been a member of the  Long-Term
Treasury  team since  September  1992 and the  Inflation-Adjusted  Treasury team
since its  inception in February  1997. He joined  American  Century in 1990. He
holds a bachelor of arts degree from Pomona College.


[left margin]

[graphic of pointing index finger]
CODE OF ETHICS

American  Century has a Code of Ethics  designed to ensure that the interests of
fund  shareholders come before the interests of the people who manage the funds.
Among other  provisions,  the Code of Ethics  prohibits  portfolio  managers and
other investment  personnel from buying securities in an initial public offering
or from  profiting  from the  purchase and sale of the same  security  within 60
calendar days. In addition,  the Code of Ethics requires  portfolio managers and
other  employees  with  access  to  information  about the  purchase  or sale of
securities by the funds to obtain approval before executing  permitted  personal
trades.


www.americancentury.com                   American Century Investments   15


FUNDAMENTAL INVESTMENT POLICIES


Fundamental  investment  policies  contained  in  the  Statement  of  Additional
Information  and the  investment  objectives  of the  funds  may not be  changed
without a shareholder  vote. The Board of Trustees may change any other policies
and investment strategies.


YEAR 2000 ISSUES

Many of the world's  computer  systems were originally  programmed in a way that
prevented   them  from  properly   recognizing   or  processing   date-sensitive
information  relating to the Year 2000 and beyond.  Because  this may impact the
computer  systems of various  American  Century-affiliated  and external service
providers  for the  funds,  American  Century  formally  initiated  a Year  2000
readiness  project in July 1997.  It involves a team of  information  technology
professionals  assisted  by outside  consultants  and  guided by a  senior-level
steering committee.  The team's goal is to assess the impact of the Year 2000 on
American Century's systems,  renovate or replace  noncompliant  critical systems
and test  those  systems.  In  addition,  the team has been  working  to  gather
information  about the Year 2000  efforts  of the  funds'  other  major  service
providers.

Although  American Century believes its critical systems will function  properly
in the Year 2000, this is not guaranteed.  If the efforts of American Century or
its  external  service  providers  are  not  successful,  the  funds'  business,
particularly the provision of shareholder services, may be hampered.

In  addition,  the  issuers  of  securities  the funds own could  have Year 2000
computer problems. Foreign issuers, especially those in emerging markets, may be
more  susceptible  to such  problems than U.S.  issuers.  These  problems  could
negatively  affect the value of the issuers'  securities,  which, in turn, could
impact the funds'  performance.  The advisor has established a process to gather
publicly  available  information about the Year 2000 readiness of these issuers.
However,  this  process  may  not  uncover  all  relevant  information,  and the
information  gathered may not be complete and  accurate.  Moreover,  an issuer's
Year 2000  readiness is only one of many factors the fund  managers may consider
when making investment decisions, and other factors may receive greater weight.


16   American Century Investments                             1-800-345-3533


INVESTING WITH AMERICAN CENTURY

ELIGIBILITY FOR ADVISOR CLASS SHARES

The  Advisor  Class  shares  are  intended  for  purchase  by   participants  in
employer-sponsored retirement or savings plans and for persons purchasing shares
through   broker-dealers,   banks,   insurance  companies  and  other  financial
intermediaries that provide various administrative and distribution services.


INVESTING THROUGH FINANCIAL INTERMEDIARIES


If you do business  with us through a  financial  intermediary  or a  retirement
plan,  your ability to purchase,  exchange and redeem  shares will depend on the
policies of that entity. Some policy differences may include

minimum investment requirements

exchange policies

fund choices

cutoff time for investments


Please  contact  your  financial  intermediary  or plan  sponsor  for a complete
description  of its policies.  Copies of the funds' annual  reports,  semiannual
reports  and  Statement  of  Additional  Information  are  available  from  your
intermediary or plan sponsor.


Certain  financial   intermediaries  perform  recordkeeping  and  administrative
services  for their  clients  that would  otherwise  be  performed  by  American
Century's transfer agent. In some  circumstances,  American Century will pay the
service provider a fee for performing those services.

Although  transactions in fund shares may be made directly with American Century
at no charge,  you also may purchase,  redeem and exchange  fund shares  through
financial  intermediaries that charge a transaction-based or other fee for their
services. Those charges are retained by the intermediary and are not shared with
American Century or the funds.


American Century has contracts with certain financial  intermediaries  requiring
them to track  the time  investment  orders  are  received  and to  comply  with
procedures  relating to the  transmission  of orders.  The funds have authorized
those  intermediaries  to accept  orders on their behalf up to the time at which
the net asset value is determined.  If those orders are  transmitted to American
Century and paid for in accordance with the contract, they will be priced at the
net asset  value next  determined  after your  request is  received  in the form
required by the intermediary on a fund's behalf.


ABUSIVE TRADING PRACTICES

We do not permit market timing or other abusive trading practices in our funds.


Excessive,  short-term  (market timing) or other abusive  trading  practices may
disrupt portfolio management  strategies and harm fund performance.  To minimize
harm to the funds and their  shareholders,  we  reserve  the right to reject any
purchase order (including  exchanges) from any investor we believe has a history
of  abusive  trading  or  whose  trading,  in our  judgment,  has been or may be
disruptive to a fund. In making this judgment,  we may consider  trading done in
multiple  accounts under common ownership or control.  We also reserve the right
to delay delivery of your redemption proceeds -- up to seven days -- or to honor
certain redemptions with securities,  rather than cash, as described in the next
section.


[left margin]


[graphic of pointing index finger]
Financial intermediaries include banks, broker-dealers,  insurance companies and
investment advisors.



www.americancentury.com                   American Century Investments   17


SPECIAL REQUIREMENTS FOR LARGE REDEMPTIONS


If,  during any 90-day  period,  you redeem fund shares worth more than $250,000
(or 1% of the assets of the fund if that percentage is less than  $250,000),  we
reserve  the right to pay part or all of the  redemption  proceeds  in excess of
this amount in readily marketable securities instead of cash. If we make payment
in securities,  we will value the securities  selected by the fund managers,  in
the same manner as we do in computing the fund's net asset value. We may provide
these securities in lieu of cash without prior notice.


If your  redemption  would  exceed  this limit and you would like to avoid being
paid in  securities,  please  provide us with an  unconditional  instruction  to
redeem at least 15 days prior to the date on which the redemption transaction is
to occur.  The instruction must specify the dollar amount or number of shares to
be redeemed and the date of the  transaction.  This  minimizes the effect of the
redemption on the fund and its remaining shareholders.


18    American Century Investments                             1-800-345-3533



SHARE PRICE AND DISTRIBUTIONS

SHARE PRICE

American  Century  determines  the NET ASSET  VALUE (NAV) of the funds as of the
close of regular trading on the New York Stock Exchange  (usually 4 p.m. Eastern
time)  each day the  Exchange  is open.  On days when the  Exchange  is not open
(including  certain U.S.  holidays),  we do not  calculate the NAV. The NAV of a
fund share is the current  value of the fund's  assets,  minus any  liabilities,
divided by the number of fund shares outstanding.

If current market prices of securities  owned by non-money  market funds are not
readily available, the advisor may determine their fair value in accordance with
procedures adopted by the funds' Board of Trustees.  The portfolio securities of
the money  market  funds are  valued at  amortized  cost.  This  means  that the
securities are initially valued at their cost when purchased.  After the initial
purchase,  the  difference  between  the  purchase  price and the known value at
maturity will be reduced at a constant rate until maturity.  This valuation will
be used  regardless  of the impact of interest  rates on the market value of the
security.  The Board has adopted  procedures to ensure that this type of pricing
is fair to the funds' shareholders.

We will price your purchase,  exchange or redemption at the NAV next  determined
after we receive your transaction request in good order.

DISTRIBUTIONS

Federal tax laws require each fund to make  distributions to its shareholders in
order  to  qualify  as a  "regulated  investment  company."  Qualification  as a
regulated investment company means that the fund will not be subject to state or
federal income tax on amounts distributed.  The distributions  generally consist
of dividends and interest  received,  as well as CAPITAL  GAINS  realized on the
sale of investment securities.

Each money market fund  declares  and  reinvests  distributions  from net income
daily. Each of the other funds declares  distributions from net income daily and
pays these  distributions  from net income monthly.  Each fund (except the money
market funds) generally pays distributions of capital gains, if any, once a year
usually in December. A fund may make more frequent distributions,  if necessary,
to comply with Internal  Revenue Code provisions.  Distributions  are reinvested
automatically in additional shares unless you choose another option.

You will participate in fund distributions,  when they are declared, starting on
the day after your purchase is effective. For example, if you purchase shares on
a day that a distribution is declared,  you will not receive that  distribution.
If you redeem shares, you will receive any distribution  declared on the day you
redeem.  If you redeem all shares,  we will include any  distributions  received
with your redemption proceeds.

Participants in employer-sponsored retirement or savings plans must reinvest all
distributions.  For shareholders  investing  through taxable  accounts,  we will
reinvest distributions unless you elect to receive them in cash.


[left margin]

The NET ASSET VALUE of a fund is the price of the fund's shares.

CAPITAL GAINS are increases in the values of capital assets, such as stock, from
the time the assets are  purchased.  Tax  becomes  due on capital  gains once an
asset is sold.


www.americancentury.com                   American Century Investments   19


TAXES

The tax  consequences  of  owning  shares of the funds  will vary  depending  on
whether you own them through a taxable or tax-deferred account. Tax consequences
result from distributions by the funds of dividend and interest income they have
received  or  capital  gains  they  have  generated   through  their  investment
activities.  Tax consequences also result from sales of fund shares by investors
after the net asset value has increased or decreased.

Tax-Deferred Accounts

If you purchase fund shares through a tax-deferred  account, such as an IRA or a
qualified  employer-sponsored  retirement  or savings  plan,  income and capital
gains  distributions  usually will not be subject to current taxation,  but will
accumulate in your account  under the plan on a  tax-deferred  basis.  Likewise,
moving  from one fund to  another  fund  within a plan or  tax-deferred  account
generally  will  not  cause  you to be  taxed.  For  information  about  the tax
consequences of making  purchases or withdrawals  through an  employer-sponsored
retirement  or  savings  plan,  or  through  an IRA,  please  consult  your plan
administrator, your summary plan description or a professional tax advisor.

Taxable Accounts

If you own fund shares through a taxable account,  distributions by the fund and
sales by you of fund shares may cause you to be taxed.

Taxability of Distributions

Fund distributions may consist of income earned by the fund from sources such as
dividends  and  interest,  or  capital  gains  generated  from  the sale of fund
investments. Distributions of income are taxed as ordinary income. Distributions
of capital gains are classified  either as short term or long term and are taxed
as follows:


Type of Distribution       Tax Rate for 15% Bracket    Tax Rate for 28% Bracket
                                                       or Above
- -------------------------------------------------------------------------------
Short-term capital gains   Ordinary income rate        Ordinary income rate
- -------------------------------------------------------------------------------
Long-term capital gains    10%                         20%

The tax status of any  distributions  of capital gains is determined by how long
the fund held the  underlying  security that was sold,  not by how long you have
been  invested  in the  fund or  whether  you  reinvest  your  distributions  in
additional  shares or take them in cash.  American Century will send you the tax
status of fund  distributions  for each  calendar  year in an annual tax mailing
(Form 1099-DIV) from each fund.


Distributions  also may be subject to state and local taxes.  Because everyone's
tax situation is unique,  always  consult your tax  professional  about federal,
state and local tax consequences.

Taxes on Transactions


Your  redemptions -- including  exchanges to other American Century funds -- are
subject to capital  gains tax.  The table above can provide a general  guide for
your potential tax liability when selling or exchanging fund shares.  Short-term
capital gains are gains on fund shares you held for 12 months or less. Long-term
capital gains are gains on fund shares you held for more than 12 months. If your
shares  decrease in value,  their sale or exchange will result in a long-term or
short-term  capital loss.  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
gains  to you  with  respect  to  such  shares.  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.  If you have not certified to us that your
Social Security number or tax identification  number is correct and that you are
not subject to 31% withholding, we are required to withhold and remit to the IRS
31% of dividends, capital gains distributions and redemptions.


[left margin]

[graphic of pointing index finger]
BUYING A DIVIDEND

Purchasing  fund shares in a taxable  account  shortly before a distribution  is
sometimes known as buying a dividend.  In taxable accounts,  you must pay income
taxes on the  distribution  whether you reinvest the  distribution or take it in
cash. In addition,  you will have to pay taxes on the  distribution  whether the
value of your  investment  decreased,  increased  or remained the same after you
bought the fund shares.

The risk in buying a dividend  is that a fund's  portfolio  may build up taxable
gains throughout the period covered by a distribution, as securities are sold at
a profit. We distribute those gains to you, after  subtracting any losses,  even
if you did not own the shares when the gains occurred.

If you buy a  dividend,  you incur the full tax  liability  of the  distribution
period,  but you may not enjoy the full  benefit  of the gains  realized  in the
fund's portfolio.


20   American Century Investments                             1-800-345-3533


MULTIPLE CLASS INFORMATION



American  Century  offers two classes of the funds:  Investor  Class and Advisor
Class.  The shares  offered by this  Prospectus are Advisor Class shares and are
offered primarily to institutional investors through institutional  distribution
channels,  such  as  employer-sponsored  retirement  plans,  or  through  banks,
broker-dealers and insurance companies.

American Century offers another class of shares that has no up-front or deferred
charges, commissions or 12b-1 fees. The other class has different fees, expenses
and/or minimum investment requirements than the Advisor Class. The difference in
the  fee  structures  between  the  classes  is the  result  of  their  separate
arrangements for shareholder and distribution services and not the result of any
difference  in  amounts  charged by the  advisor  for core  investment  advisory
services.  Accordingly,  the core  investment  advisory  expenses do not vary by
class.  Different  fees and expenses  will affect  performance.  For  additional
information concerning the other class of shares not offered by this Prospectus,
call us at  1-800-345-2021  for Investor  Class  shares.  You also can contact a
sales representative or financial intermediary who offers that class of shares.

Except as  described  below,  all classes of shares of the funds have  identical
voting,  dividend,   liquidation  and  other  rights,  preferences,   terms  and
conditions.  The only differences  between the classes are (a) each class may be
subject to  different  expenses  specific  to that  class;  (b) each class has a
different  identifying  designation or name; (c) each class has exclusive voting
rights with respect to matters solely  affecting such class;  and (d) each class
may have different exchange privileges.


Service and Distribution Fees


Investment Company Act Rule 12b-1 permits mutual funds that adopt a written plan
to pay out of fund assets certain  expenses  associated with the distribution of
their shares. The funds' Advisor Class shares have a 12b-1 Plan. Under the Plan,
the  funds  pay an  annual  fee of  0.50%  of  fund  assets,  half  for  certain
shareholder and administrative  services and half for distribution services. The
advisor,  as paying  agent for the funds,  pays all or a portion of such fees to
the  banks,  broker-dealers  and  insurance  companies  that  make  such  shares
available.  Because  these fees are paid out of the funds'  assets on an ongoing
basis,  over time these fees will increase the cost of your  investment  and may
cost  you  more  than  paying  other  types of  sales  charges.  For  additional
information about the Plan and its terms, see "Multiple Class  Structure--Master
Distribution  and  Shareholder  Services  Plan" in the  Statement of  Additional
Information.



www.americancentury.com                   American Century Investments   21


FINANCIAL HIGHLIGHTS

UNDERSTANDING THE FINANCIAL HIGHLIGHTS

The tables on the next few pages  itemize  what  contributed  to the  changes in
share  price  during the  period.  They also show the changes in share price for
this period in comparison to changes over the last five fiscal years.

On a per-share basis, each table includes as appropriate

* share price at the beginning of the period

* investment income and capital gains or losses

* distributions of income and capital gains paid to shareholders

* share price at the end of the period

Each table also includes some key statistics for the period as appropriate

* TOTAL RETURN -- the overall percentage of return of the fund, assuming
  the reinvestment of all distributions

* EXPENSE RATIO -- operating expenses as a percentage of average net assets

* NET INCOME RATIO -- net investment income as a percentage of average
  net asset

* PORTFOLIO TURNOVER -- the percentage of the fund's buying and selling
  activity


The  Financial  Highlights  for the fiscal  years ended March 31, 1998 and 1999,
have been audited by PricewaterhouseCoopers LLP, independent accountants.  Their
report is included  in the funds'  annual  reports,  which are  incorporated  by
reference into the Statement of Additional  Information,  and are available upon
request.



22    American Century Investments                             1-800-345-3533


<TABLE>
<CAPTION>

SHORT-TERM TREASURY FUND

Advisor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                                              1999        1998(1)
- ----------------------------------------------------------------------------------------------------
<S>                                                                          <C>            <C>
Net Asset Value, Beginning of Period .....................................   $9.80          $9.80
                                                                           --------       --------
Income From Investment Operations
  Net Investment Income ..................................................    0.46           0.25

  Net Realized and Unrealized Gain on Investment Transactions ............    0.05             --
                                                                           --------       --------
  Total From Investment Operations .......................................    0.51           0.25
                                                                           --------       --------
Distributions
  From Net Investment Income .............................................  (0.46)         (0.25)
                                                                           --------       --------
Net Asset Value, End of Period ...........................................   $9.85          $9.80
                                                                           ========       ========
  Total Return(2) ........................................................   5.34%          2.51%

RATIOS/SUPPLEMENTAL DATA

                                                                              1999        1998(1)
- ----------------------------------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets ........................   0.76%       0.78%(3)

Ratio of Net Investment Income to Average Net Assets .....................   4.67%       5.20%(3)

Portfolio Turnover Rate ..................................................    138%           140%

Net Assets, End of Period (in thousands) .................................  $3,102         $1,460

(1) October 6, 1997 (commencement of sale) through March 31, 1998.

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

(3) Annualized.


www.americancentury.com                  American Century Investments   23


INTERMEDIATE-TERM TREASURY FUND

Advisor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                                         1999        1998(1)
- ---------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period ................................  $10.56         $10.42
                                                                      --------       --------
Income From Investment Operations
  Net Investment Income .............................................    0.51           0.26

  Net Realized and Unrealized Gain on Investment Transactions .......    0.10           0.14
                                                                      --------       --------
  Total From Investment Operations ..................................    0.61           0.40
                                                                      --------       --------
Distributions
  From Net Investment Income ........................................  (0.51)         (0.26)

  From Net Realized Gains on Investment Transactions ................  (0.21)             --
                                                                      --------       --------
  Total Distributions ...............................................  (0.72)         (0.26)
                                                                      --------       --------
Net Asset Value, End of Period ......................................  $10.45         $10.56
                                                                      ========       ========
  Total Return(2) ...................................................   5.83%          3.90%

RATIOS/SUPPLEMENTAL DATA

                                                                         1999        1998(1)
- ---------------------------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets ...................   0.76%       0.77%(3)

Ratio of Net Investment Income to Average Net Assets ................   4.76%       5.28%(3)

Portfolio Turnover Rate .............................................    221%        194%(4)

Net Assets, End of Period (in thousands) ............................  $6,117           $128


(1) October 9, 1997 (commencement of sale) through March 31, 1998.

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

(3) Annualized.

(4) Purchases,  sales and market value amounts for Intermediate-Term  Government
prior to the merger were excluded from the portfolio turnover calculation.


24   American Century Investments                             1-800-345-3533


GNMA FUND

Advisor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                                     1999        1998(1)
- -----------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period ...........................   $10.67         $10.63
                                                                  --------       --------
Income From Investment Operations
  Net Investment Income ........................................     0.61           0.31

  Net Realized and Unrealized Gain (Loss)
  on Investment Transactions ...................................   (0.05)           0.04
                                                                  --------       --------
  Total From Investment Operations .............................     0.56           0.35
                                                                  --------       --------
Distributions
  From Net Investment Income ...................................   (0.61)         (0.31)
                                                                  --------       --------
  Net Asset Value, End of Period ...............................   $10.62         $10.67
                                                                  ========       ========
  Total Return(2) ..............................................    5.40%          3.30%

RATIOS/SUPPLEMENTAL DATA

                                                                     1999        1998(1)
- -----------------------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets ..............    0.84%       0.84%(3)

Ratio of Net Investment Income  to Average Net Assets ..........    5.73%       5.92%(3)

Portfolio Turnover Rate ........................................     119%          133%

Net Assets, End of Period (in thousands) .......................   $6,910          $460


(1) October 9, 1997 (commencement of sale) through March 31, 1998.

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

(3) Annualized.


www.americancentury.com                   American Century Investments  25


LONG-TERM TREASURY FUND

Advisor Class

For a Share Outstanding Throughout the Years Ended March 31 (except as noted)

PER-SHARE DATA

                                                                                1999        1998(1)
- ----------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period ......................................   $10.58         $10.85
                                                                             --------       --------
Income From Investment Operations
  Net Investment Income ...................................................     0.56           0.12

  Net Realized and Unrealized Gain (Loss) on Investment Transactions ......     0.11         (0.27)
                                                                             --------       --------
  Total From Investment Operations ........................................     0.67         (0.15)
                                                                             --------       --------
Distributions
  From Net Investment Income ..............................................   (0.56)         (0.12)

  From Net Realized Gains on Investment Transactions ......................   (0.34)             --

  In Excess of Net Realized Gains .........................................   (0.23)             --
                                                                             --------       --------
  Total Distributions .....................................................   (1.13)         (0.12)
                                                                             --------       --------
Net Asset Value, End of Period ............................................   $10.12         $10.58
                                                                             ========       ========
  Total Return(2) .........................................................    6.07%        (1.34)%

RATIOS/SUPPLEMENTAL DATA

                                                                                1999        1998(1)
- ----------------------------------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets .........................    0.76%       0.77%(3)

Ratio of Net Investment Income to Average Net Assets ......................    5.12%       5.42%(3)

Portfolio Turnover Rate ...................................................     105%           57%

Net Assets, End of Period (in thousands) ..................................   $2,587          $218


(1) January 12, 1998 (commencement of sale) through March 31, 1998.

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

(3) Annualized.
</TABLE>


26  American Century Investments                             1-800-345-3533


INFLATION-ADJUSTED TREASURY FUND

Advisor Class

For a Share Outstanding Throughout the Period Indicated

PER-SHARE DATA

                                                                      1999(1)
- --------------------------------------------------------------------------------
Net Asset Value, Beginning of Period ..............................     $9.64
                                                                    ------------
Income From Investment Operations
  Net Investment Income ...........................................      0.34

  Net Realized and Unrealized Loss
  on Investment Transactions ......................................    (0.16)
                                                                    ------------
  Total From Investment Operations ................................      0.18
                                                                    ------------
Distributions
  From Net Investment Income ......................................    (0.34)
                                                                    ------------
Net Asset Value, End of Period ....................................     $9.48
                                                                    ============
  Total Return(2) .................................................     1.94%

RATIOS/SUPPLEMENTAL DATA
                                                                      1999(1)
- --------------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets .................  0.74%(3)

Ratio of Net Investment Income to Average Net Assets ..............  4.56%(3)

Portfolio Turnover Rate ...........................................      127%

Net Assets, End of Period (in thousands) ..........................       $10


(1) June 15, 1998 (commencement of sale) through March 31, 1999.

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

(3) Annualized.


www.americancentury.com                   American Century Investments  27


SHORT-TERM GOVERNMENT FUND

Advisor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                                  1999(1)
- ---------------------------------------------------------------------------
Net Asset Value, Beginning of Period ..........................     $9.49
                                                                -----------
Income From Investment Operations
  Net Investment Income .......................................      0.33

  Net Realized and Unrealized Loss
  on Investment Transactions ..................................    (0.02)
                                                                -----------
  Total From Investment Operations ............................      0.31
                                                                -----------
Distributions
  From Net Investment Income ..................................    (0.33)
                                                                -----------
Net Asset Value, End of Period ................................     $9.47
                                                                ===========
  Total Return(2) .............................................     3.37%

RATIOS/SUPPLEMENTAL DATA
                                                                  1999(1)
- ---------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets .............  0.84%(3)

Ratio of Net Investment Income to Average Net Assets ..........  4.77%(3)

Portfolio Turnover Rate .......................................      196%

Net Assets, End of Period (in thousands) ......................       $94


(1) July 8, 1998 (commencement of sale) through March 31, 1999.

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

(3) Annualized.


28  American Century Investments                             1-800-345-2021


PERFORMANCE INFORMATION OF OTHER CLASS

The following  financial  information is provided to show the performance of the
funds' original class of shares.  This class,  the Investor  Class,  has a total
expense ratio that is 0.25% lower than the Advisor  Class.  If the Advisor Class
existed  during the periods  presented,  its  performance  would have been lower
because of the additional expense.

The tables  itemize  what  contributed  to the changes in share price during the
period.  They also show the changes in share price for this period in comparison
to changes over the last five fiscal  years (or less,  if the share class is not
five years old).

On a per-share basis, each table includes as appropriate

* share price at the beginning of the period

* investment income and capital gains or losses

* distributions of income and capital gains paid to shareholders

* share price at the end of the period

Each table also includes some key statistics for the period as appropriate

* TOTAL RETURN -- the overall percentage of return of the fund, assuming
  the reinvestment of all distributions

* EXPENSE RATIO -- operating expenses as a percentage of average net assets

* NET INCOME RATIO -- net investment income as a percentage of average net
  assets

* PORTFOLIO TURNOVER -- the percentage of the fund's buying and selling
  activity

The  Financial  Highlights  for the fiscal  years ended March 31, 1998 and 1999,
have been audited by PricewaterhouseCoopers LLP, independent accountants.  Their
report is included  in the funds'  annual  reports,  which are  incorporated  by
reference into the Statement of Additional  Information,  and are available upon
request.  Prior years'  information was audited by other  independent  auditors,
whose report also is  incorporated by reference into the Statement of Additional
Information.


www.americancentury.com                   American Century Investments  29


<TABLE>
<CAPTION>
GOVERNMENT AGENCY MONEY MARKET FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                               1999           1998           1997           1996         1995
- ---------------------------------------------------------------------------------------------------------------
<S>                                            <C>            <C>            <C>            <C>          <C>
Net Asset Value, Beginning of Year ......      $1.00          $1.00          $1.00          $1.00        $1.00
                                              -------        -------        -------        -------      -------
Income From Investment Operations
     Net Investment Income ..............       0.05           0.05           0.05           0.05         0.04
                                              -------        -------        -------        -------      -------
Distributions
     From Net Investment Income .........     (0.05)         (0.05)         (0.05)         (0.05)       (0.04)
                                              -------        -------        -------        -------      -------
Net Asset Value, End of Year ............      $1.00          $1.00          $1.00          $1.00        $1.00
                                              =======        =======        =======        =======      =======
     Total Return(1) ....................      4.91%          5.14%          4.89%          5.35%        4.47%

RATIOS/SUPPLEMENTAL DATA

                                               1999           1998           1997           1996         1995
- ----------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses to
Average Net Assets(2) ...................      0.48%          0.51%          0.57%          0.51%        0.50%

Ratio of Net Investment Income to
Average Net Assets ......................      4.79%          5.02%          4.76%          5.20%        4.35%

Net Assets, End of Year (in thousands) ..   $527,842       $487,791       $470,759       $503,328     $461,803


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.

(2) The  ratios  for years  ended  March 31,  1997 and March 31,  1996,  include
expenses paid through expense offset arrangements.


30  American Century Investments                             1-800-345-2021


SHORT-TERM TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                  1999           1998            1997           1996          1995
- --------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year ........      $9.80          $9.68           $9.84          $9.73         $9.86
                                                -------        -------         -------        -------       --------

Income From Investment Operations
    Net Investment Income .................       0.49           0.53            0.52           0.53         0.50

    Net Realized and Unrealized Gain
    (Loss) on Investment Transactions .....       0.05           0.12          (0.07)           0.11        (0.13)
                                                -------        -------         -------        -------       --------
    Total From Investment Operations ......       0.54           0.65            0.45           0.64         0.37
                                                -------        -------         -------        -------       --------
Distributions
    From Net Investment Income ............     (0.49)         (0.53)          (0.52)         (0.53)        (0.50)

    From Net Realized Gains
    on Investment Transactions ............         --             --          (0.09)            --           --
                                                -------        -------         -------        -------       --------
    Total Distributions ...................     (0.49)         (0.53)          (0.61)         (0.53)        (0.50)
                                                -------        -------         -------        -------       --------
Net Asset Value, End of Year ..............      $9.85          $9.80           $9.68          $9.84         $9.73
                                                =======        =======         =======        =======       ========
    Total Return(1) .......................      5.60%          6.89%           4.62%          6.71%         3.85%

RATIOS/SUPPLEMENTAL DATA

                                                  1999           1998            1997           1996          1995
- --------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets .....................      0.51%          0.55%           0.61%          0.67%         0.67%

Ratio of Net Investment Income
to Average Net Assets .....................      4.92%          5.45%           5.26%          5.39%         5.22%

Portfolio Turnover Rate ...................       138%           140%            234%           224%          141%

Net Assets, End of Year
(in thousands) ............................    $61,783        $40,874         $35,854        $35,648       $56,090


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.


www.americancentury.com                   American Century Investments  31


INTERMEDIATE-TERM TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                   1999            1998            1997           1996          1995
- ---------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year ........      $10.56          $10.06          $10.24        $  9.99        $10.18
                                                --------        --------        --------       --------      --------
Income From Investment Operations
   Net Investment Income ..................        0.54            0.59            0.58           0.58           0.53

   Net Realized and Unrealized Gain (Loss)
   on Investment Transactions .............        0.10            0.50          (0.18)           0.25          (0.19)
                                                --------        --------        --------       --------      --------
   Total From Investment Operations .......        0.64            1.09            0.40           0.83           0.34
                                                --------        --------        --------       --------      --------
Distributions
   From Net Investment Income .............      (0.54)          (0.59)          (0.58)         (0.58)          (0.53)

   From Net Realized Gains
   on Investment Transactions .............      (0.21)            --              --             --             --
                                                --------        --------        --------       --------      --------
   Total Distributions ....................      (0.75)          (0.59)          (0.58)         (0.58)          (0.53)
                                                --------        --------        --------       --------      --------
Net Asset Value, End of Year ..............      $10.45          $10.56          $10.06         $10.24       $   9.99
                                                ========        ========        ========       ========      ========
   Total Return(1) ........................       6.09%          11.04%           4.05%          8.42%           3.54%

RATIOS/SUPPLEMENTAL DATA

                                                   1999            1998            1997           1996           1995
- ---------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets .....................       0.51%           0.51%           0.51%          0.53%           0.53%

Ratio of Net Investment Income
to Average Net Assets .....................       5.01%           5.63%           5.72%          5.65%           5.35%

Portfolio Turnover Rate ...................        221%         194%(2)            110%           168%             92%

Net Assets, End of Year
(in thousands) ............................    $435,494        $374,861        $328,784       $311,020        $305,353


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.

(2) Purchases,  sales and market value amounts for Intermediate-Term  Government
prior to the merger were excluded from the portfolio turnover calculation.


32  American Century Investments                             1-800-345-2021


LONG-TERM TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                 1999           1998           1997          1996           1995
- ------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year .........   $10.58        $  9.32          $9.67         $9.05          $9.38
                                              --------       --------        -------       -------        -------
Income From Investment Operations
    Net Investment Income ..................     0.58           0.61           0.60          0.60           0.60

    Net Realized and Unrealized Gain (Loss)
    on Investment Transactions .............     0.11           1.26         (0.35)          0.62         (0.33)
                                              --------       --------        -------       -------        -------
    Total From Investment Operations .......     0.69           1.87           0.25          1.22           0.27
                                              --------       --------        -------       -------        -------
Distributions
    From Net Investment Income .............   (0.58)         (0.61)         (0.60)        (0.60)         (0.60)

    From Net Realized Gains
    on Investment Transactions .............   (0.52)           --             --            --             --

    In Excess of Net Realized Gains ........   (0.05)           --             --            --             --
                                              --------       --------        -------       -------        -------
    Total Distributions ....................   (1.15)         (0.61)         (0.60)        (0.60)         (0.60)
                                              --------       --------        -------       -------        -------
Net Asset Value, End of Year ...............   $10.12         $10.58          $9.32         $9.67          $9.05
                                              ========       ========        =======       =======        =======
    Total Return(1) ........................    6.33%         20.48%          2.65%        13.46%          3.25%

RATIOS/SUPPLEMENTAL DATA

                                                 1999           1998           1997          1996           1995
- ------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets ......................    0.51%          0.54%          0.60%         0.67%          0.67%

Ratio of Net Investment Income
to Average Net Assets ......................    5.37%          6.00%          6.28%         5.93%          6.84%

Portfolio Turnover Rate ....................     105%            57%            40%          112%           147%

Net Assets, End of Year
(in thousands) ............................. $137,552       $103,381       $126,570      $110,741        $34,906


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.


www.americancentury.com                   American Century Investments  33


SHORT-TERM GOVERNMENT FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                              1999      1998(1)          1997          1996          1995        1994
- ---------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period .....   $9.46        $9.49         $9.47         $9.51         $9.27       $9.67
                                            -------     -------        -------       -------       -------    -------
Income From Investment Operations
    Net Investment Income ................    0.49         0.21          0.52          0.51          0.52        0.40

    Net Realized and Unrealized Gain
    (Loss) on Investment Transactions ....    0.01       (0.03)          0.02        (0.04)          0.24       (0.40)
                                            -------     -------        -------       -------       -------    -------
    Total From Investment Operations .....    0.50         0.18          0.54          0.47          0.76          --
                                            -------     -------        -------       -------       -------    -------
Distributions
    From Net Investment Income ...........  (0.49)       (0.21)        (0.52)        (0.51)        (0.52)       (0.40)
                                            -------     -------        -------       -------       -------    -------
Net Asset Value, End of Period ...........   $9.47        $9.46         $9.49         $9.47         $9.51       $9.27
                                            =======     =======        =======       =======       =======    =======
    Total Return(2) ......................   5.39%        1.95%         5.86%         5.09%         8.42%        0.07%

RATIOS/SUPPLEMENTAL DATA

                                              1999      1998(1)          1997          1996          1995        1994
- ----------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets ....................   0.59%     0.59%(3)         0.68%         0.70%         0.70%        0.81%

Ratio of Net Investment Income to
Average Net Assets .......................   5.15%     5.43%(3)         5.53%         5.39%         5.53%        4.17%

Portfolio Turnover Rate ..................    196%          54%       293%(4)          246%          128%         470%

Net Assets, End of Period
(in thousands) ...........................$832,344     $808,464      $519,332      $349,772      $391,331     $396,753

(1) The fund's fiscal year end was changed from October 31 to March 31 resulting
in a five month  reporting  period.  For years ended  prior to 1998,  the fund's
fiscal year end was October 31.

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

(3) Annualized.

(4)  Purchases,  sales and the market value of securities  for  Adjustable  Rate
Government  Securities  prior to the merger  were  excluded  from the  portfolio
turnover calculation.


34  American Century Investments                             1-800-345-2021


GNMA FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31

PER-SHARE DATA

                                                 1999            1998           1997          1996            1995
- -------------------------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Year .........   $10.67          $10.33         $10.45        $10.18           $10.35
                                              --------        --------       --------      --------        --------
Income From Investment Operations
   Net Investment Income ...................     0.64            0.69           0.71          0.74            0.72

   Net Realized and Unrealized Gain
   (Loss) on Investment Transactions .......   (0.05)            0.34         (0.12)          0.27            (0.18)
                                              --------        --------       --------      --------        --------
   Total From Investment Operations ........     0.59            1.03           0.59          1.01            0.54
                                              --------        --------       --------      --------        --------
Distributions
   From Net Investment Income ..............   (0.64)          (0.69)         (0.71)        (0.74)            (0.71)
                                              --------        --------       --------      --------        --------
Net Asset Value, End of Year ...............   $10.62          $10.67         $10.33        $10.45           $10.18
                                              ========        ========       ========      ========        ========
   Total Return(1) .........................    5.66%          10.21%          5.84%        10.08%            5.53%

RATIOS/SUPPLEMENTAL DATA

                                                 1999            1998           1997          1996            1995
- -------------------------------------------------------------------------------------------------------------------
Ratio of Operating Expenses
to Average Net Assets(2) ...................    0.59%           0.58%          0.55%         0.58%            0.58%

Ratio of Net Investment Income
to Average Net Assets ......................    5.98%           6.49%          6.84%         6.98%            7.08%

Portfolio Turnover Rate ....................     119%            133%           105%           64%            120%

Net Assets, End of Year
(in thousands) ............................$1,415,607      $1,285,641     $1,119,165    $1,120,019       $979,670


(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
distributions, if any.

(2) The  ratios  for years  ended  March 31,  1997 and March 31,  1996,  include
expenses paid through expense offset arrangements.


www.americancentury.com                   American Century Investments  35


INFLATION-ADJUSTED TREASURY FUND

Investor Class

For a Share Outstanding Throughout the Years Ended March 31 (except as noted)

PER-SHARE DATA

                                                              1999             1998         1997(1)
- ----------------------------------------------------------------------------------------------------
Net Asset Value, Beginning of Period .....................   $9.63            $9.74          $10.00
                                                            -------          -------        --------
Income From Investment Operations
    Net Investment Income ................................    0.47             0.44            0.06

    Net Realized and Unrealized Loss
    on Investment Transactions ...........................  (0.15)           (0.11)          (0.26)
                                                            -------          -------        --------
    Total From Investment Operations .....................    0.32             0.33          (0.20)
                                                            -------          -------        --------
Distributions
    From Net Investment Income ...........................  (0.47)           (0.44)          (0.06)
                                                            -------          -------        --------
Net Asset Value, End of Period ...........................   $9.48            $9.63         $  9.74
                                                            =======          =======        ========
    Total Return(2) ......................................   3.37%            3.45%         (1.98)%

RATIOS/SUPPLEMENTAL DATA

                                                              1999             1998         1997(1)
- -----------------------------------------------------------------------------------------------------
Ratio of Operating Expenses to Average Net Assets ........   0.49%            0.50%        0.50%(3)

Ratio of Net Investment Income to Average Net Assets .....   4.84%            4.45%        5.03%(3)

Portfolio Turnover Rate ..................................    127%              69%             --

Net Assets, End of Period (in thousands) .................  $8,980           $5,279          $2,277


(1) February 10, 1997 (inception) through March 31, 1997.

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

(3) Annualized.
</TABLE>


36   American Century Investments                             1-800-345-2021


NOTES


www.americancentury.com                   American Century Investments  37


[back cover]

MORE INFORMATION ABOUT THE FUNDS IS CONTAINED IN THESE DOCUMENTS

Annual and Semiannual Reports

These reports  contain more  information  about the funds'  investments  and the
market  conditions and investment  strategies  that  significantly  affected the
funds' performance during the most recent fiscal period.

Statement of Additional Information

The SAI contains a more detailed,  legal  description of the funds'  operations,
investment  restrictions,  policies and practices.  The SAI is  incorporated  by
reference  into this  Prospectus.  This means  that it is  legally  part of this
Prospectus, even if you don't request a copy.



You may obtain a free copy of the SAI or annual and semiannual reports,  and ask
any questions about the funds or your accounts,  by contacting  American Century
at the address or telephone numbers listed below.


You also can get  information  about  the  funds  (including  the SAI)  from the
Securities and Exchange Commission (SEC).

* In person                SEC Public Reference Room
                           Washington, D.C.
                           Call 1-800-SEC-0330 for location
                           and hours.

* On the Internet          www.sec.gov

* By mail                  SEC Public Reference Section
                           Washington, D.C. 20549-6009
                           (The SEC will charge a fee for copying
                           the documents.)

Investment Company Act File No. 811-4363

                        [american century logo (reg. sm)]
                                    American
                                    Century


                          AMERICAN CENTURY INVESTMENTS
                                P.O. Box 419385
                        Kansas City, Missouri 64141-6385

                         1-800-345-3533 or 816-531-5575


9908
SH-PRS-16704
<PAGE>
 [front cover]
                               AMERICAN CENTURY

                               Statement of  Additional Information


                                                      Capital Preservation Fund

                                            Government Agency Money Market Fund

                                                       Short-Term Treasury Fund

                                                Intermediate-Term Treasury Fund

                                                        Long-Term Treasury Fund

                                               Inflation-Adjusted Treasury Fund

                                                     Short-Term Government Fund


                                                                      GNMA Fund

                                               [american century logo (reg. sm)]
                                                                        American
                                                                         Century


[left margin]


                                                                 AUGUST 1, 1999


                                                               American Century
                                                               Investment Trust


   THIS STATEMENT OF ADDITIONAL INFORMATION ADDS TO THE DISCUSSION IN THE FUNDS'
     PROSPECTUS, DATED AUGUST 1, 1999, BUT IS NOT A PROSPECTUS. THE STATEMENT OF
   ADDITIONAL INFORMATION SHOULD BE READ IN CONJUNCTION WITH THE FUNDS' CURRENTP
 ROSPECTUS. IF YOU WOULD LIKE A COPY OF THE PROSPECTUS, PLEASE CONTACT US AT THE
                        ADDRESS OR TELEPHONE NUMBERS LISTED ON THE BACK COVER OR
                                            VISIT AMERICAN CENTURY'S WEB SITE AT
                                                        WWW.AMERICANCENTURY.COM.

      THIS STATEMENT OF ADDITIONAL INFORMATION INCORPORATES BY REFERENCE CERTAIN
 INFORMATION THAT APPEARS IN THE FUNDS' ANNUAL AND SEMIANNUAL REPORTS, WHICH ARE
  DELIVERED TO ALL SHAREHOLDERS. YOU MAY OBTAIN A FREE COPY OF THE FUNDS' ANNUAL
                                OR SEMIANNUAL REPORTS BY CALLING 1-800-345-2021.

                     Distributed by Funds Distributor, Inc.


                      STATEMENT OF ADDITIONAL INFORMATION


                                August 1, 1999


TABLE OF CONTENTS


The Funds' History ........................................................    2
Fund Investment Guidelines ................................................    2
The Money Market Funds ....................................................    2
The U.S. Treasury Funds ...................................................    3
The Government Agency Funds ...............................................    4
Detailed Information About the Funds ......................................    5
Investment Strategies and Risks ...........................................    5
Investment Policies .......................................................   13
Temporary Defensive Measures ..............................................   15
Portfolio Turnover ........................................................   15
Management ................................................................   16
The Board of Trustees .....................................................   16
Officers ..................................................................   18
The Funds' Principal Shareholders .........................................   20
Service Providers .........................................................   20
Investment Advisor ........................................................   20
Transfer Agent and Administrator ..........................................   23
Distributor ...............................................................   23
Other Service Providers ...................................................   24
Brokerage Allocation ......................................................   24
Information About Fund Shares .............................................   24
Multiple Class Structure ..................................................   25
Buying and Selling Fund Shares ............................................   26
Valuation of a Fund's Securities ..........................................   27
Taxes .....................................................................   28
Federal Income Tax ........................................................   28
State and Local Taxes .....................................................   28
How Fund Performance
Information Is Calculated .................................................   29
Financial Statements ......................................................   31



Statement of Additional Information                                         1


THE FUND'S HISTORY


    American Century Government Income Trust is a registered open-end management
investment company that was organized as a Massachusetts  business trust on July
24, 1985. From then until January 1997, it was known as Benham Government Income
Trust.  Throughout this Statement of Additional Information we refer to American
Century Government Income Trust as the Trust.

    Each  fund  described  in this  Statement  of  Additional  Information  is a
separate  series of the Trust and  operates  for many  purposes as if it were an
independent  company.  Each  fund has its own  investment  objective,  strategy,
management team, assets, and tax identification and stock registration numbers.

FUND INVESTMENT GUIDELINES

    This  section  explains  the  extent to which the funds'  advisor,  American
Century Investment  Management,  Inc., can use various  investment  vehicles and
strategies  in  managing  a  fund's  assets.   Descriptions  of  the  investment
techniques  and risks  associated  with each appear in the section,  "Investment
Strategies  and  Risks,"  which  begins  on page 5.  In the  case of the  funds'
principal investment  strategies,  these descriptions  elaborate upon discussion
contained in the Prospectus.


    Each fund is a  diversified  open-end  investment  company as defined in the
Investment Company Act of 1940 (the Investment  Company Act).  Diversified means
that,  with respect to 75% of its total  assets,  each fund will not invest more
than 5% of its total assets in the securities of a single issuer.


    The money market funds  operate  pursuant to Rule 2a-7 under the  Investment
Company Act.  That rule permits the  valuation  of portfolio  securities  on the
basis of amortized cost. To rely on the rule, each fund must be diversified with
regard  to 100% of its  assets  other  than  U.S.  government  securities.  This
operating  policy is more  restrictive  than the  Investment  Company Act, which
requires a diversified  investment company to be diversified with regard to only
75% of its assets.


    To meet federal tax requirements for qualification as a regulated investment
company,  each fund  must  limit  its  investments  so that at the close of each
quarter  of its  taxable  year (1) no more  than  25% of its  total  assets  are
invested in the  securities of a single issuer (other than the U.S government or
a regulated  investment  company),  and (2) with  respect to at least 50% of its
total assets, no more than 5% of its total assets are invested in the securities
of a single issuer.


    Each fund  (except  Short-Term  Government  and the GNMA Fund) seeks  income
exempt  from  state  taxes by  investing  in U.S.  government  securities  whose
interest  payments are state  tax-exempt.  As a result,  these  funds'  dividend
distributions  are  expected to be exempt from state income tax. See page 28 for
more information on tax treatment of the funds' distributions.


THE MONEY MARKET FUNDS

    Each of the money  market  funds  seeks to  maintain  a $1.00  share  price,
although  there is no guarantee  they will be able to do so. Shares of the money
market funds are neither insured nor guaranteed by the U.S. government.

                         INVESTOR CLASS             ADVISOR CLASS
- ---------------------------------------------------------------------------
                      Ticker     Inception       Ticker        Inception
Fund                  Symbol     Date            Symbol        Date
- ---------------------------------------------------------------------------
Capital
Preservation          CPFXX       10/13/1972      N/A          N/A

Government Agency
Money Market          BGAXX       12/05/1989      N/A          04/12/1999


Short-Term
Treasury              BSTAX       09/08/1992      BSTTX        10/06/1997

Intermediate-Term
Treasury              CPTNX       05/16/1980      ABTAX        10/09/1997


Long-Term
Treasury              BLAGX       09/08/1992      AMLAX        01/12/1998

Inflation-Adjusted
Treasury              N/A         02/10/1997      N/A          06/15/1998

Short-Term
Government            TWUSX       12/15/1982      N/A          07/08/1998


GNMA Fund             BGNMX       09/23/1985      BGNAX        10/09/1997
- ---------------------------------------------------------------------------



2                                                  AMERICAN CENTURY INVESTMENTS


CAPITAL PRESERVATION


    Capital  Preservation  seeks  maximum  safety and  liquidity.  Its secondary
objective is to seek to pay its shareholders the highest rate of return on their
investment in Capital Preservation consistent with safety and liquidity. Capital
Preservation  pursues its  investment  objectives  by investing  exclusively  in
short-term  U.S.  Treasury  securities  guaranteed  by the direct full faith and
credit pledge of the U.S.  government.  Capital  Preservation's  dollar-weighted
average portfolio maturity will not exceed 90 days.


    While the risks  associated  with  investing  in  short-term  U.S.  Treasury
securities are very low, an investment in Capital Preservation is not risk-free.


GOVERNMENT AGENCY MONEY MARKET

    Government  Agency Money Market seeks to provide the highest rate of current
return on its  investments,  consistent with safety of principal and maintenance
of liquidity,  by investing  exclusively  in short-term  obligations of the U.S.
government  and its  agencies  and  instrumentalities,  the income from which is
exempt from state  taxes.  Under normal  conditions,  at least 65% of the fund's
total assets are invested in securities issued by agencies and instrumentalities
of the U.S. government.  Assets not invested in these securities are invested in
U.S. Treasury securities.  For temporary defensive purposes, the fund may invest
up to 100% of its  assets  in U.S.  Treasury  securities.  The  fund's  weighted
average portfolio maturity will not exceed 90 days.


    The U.S.  government  provides  varying  levels of financial  support to its
agencies and instrumentalities.

THE U.S. TREASURY FUNDS

SHORT-TERM TREASURY, INTERMEDIATE-TERM TREASURY,  LONG-TERM TREASURY


    Short-Term Treasury,  Intermediate-Term  Treasury and Long-Term Treasury are
quite similar to one another but can be differentiated by their  dollar-weighted
average  maturities.  Among  these  funds,  the longer a fund's  dollar-weighted
average  maturity,  the more its share price will  fluctuate when interest rates
change.

    This pattern is due, in part, to the time value of money.  A bond's worth is
determined,   in  part,   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.  Because of this interplay  between
market interest rates and share price, investors are encouraged to evaluate fund
performance on the basis of total return.

    The investment  objectives of the funds are as follows:  Short-Term Treasury
seeks to earn and  distribute  the highest  level of current  income exempt from
state   income   taxes  as  is   consistent   with   preservation   of  capital.
Intermediate-Term  Treasury  seeks to earn and  distribute  the highest level of
current income exempt from state taxes as is consistent with the conservation of
assets  and the  safety  provided  by U.S.  Treasury  bills,  notes  and  bonds.
Long-Term  Treasury  seeks to  provide a  consistent  and high  level of current
income exempt from state taxes.

    Short-Term, Intermediate-Term and Long-Term Treasury pursue their investment
objectives by investing primarily in securities issued or guaranteed by the U.S.
Treasury. As a result, each fund may invest in U.S. Treasury bills, bonds, notes
and  zero-coupon  securities,  all of which also are  backed by the direct  full
faith and  credit  pledge of the U.S.  government.  In  addition,  the funds may
invest up to 35% of their total  assets in  securities  issued by  agencies  and
instrumentalities of the U.S. government.

    Within this framework, the funds differ in the remaining maturities of their
portfolio securities and the dollar-weighted average maturities of their overall
portfolio.  Under normal conditions,  the funds' maturity characteristics are as
follows:  Short-Term  Treasury  invests  primarily in securities  with remaining
maturities of three years or less,  and maintains a weighted  average  portfolio
maturity  ranging  from 13 months to three years.  Intermediate-Term  Treasury's
weighted  average  portfolio  maturity ranges from three to 10 years.  Long-Term
Treasury invests primarily in securities with maturities of 10 or more years and
maintains a weighted average portfolio maturity ranging from 10 to 30 years.


    Each of the funds is designed to allow investors to seek competitive  yields
within their tolerance for share price fluctuations.  Thus,  Short-Term Treasury
may be  appropriate  for investors who are seeking  higher  current  yields than
those available from money market funds and who can tolerate some share price


STATEMENT OF ADDITIONAL INFORMATION                                          3



volatility.  Similarly,  the current yield for  Intermediate-Term  Treasury will
likely  be  higher  than  that  of  Short-Term  Treasury,  but the  share  price
volatility will be greater.  By maintaining an average portfolio  maturity of 20
to 30 years,  Long-Term  Treasury offers  investors the potential to earn higher
current  yields than those  typically  available  from  Short-Term  Treasury and
Intermediate-Term Treasury.  Long-Term Treasury also may offer greater potential
for  capital  appreciation.  However,  maintaining  a  relatively  long  average
maturity also means that Long-Term  Treasury's share price generally will be the
most volatile of the three funds.


INFLATION-ADJUSTED TREASURY


    Inflation-Adjusted  Treasury pursues its investment  objective by investing,
under  normal  market   conditions,   at  least  65%  of  its  total  assets  in
inflation-indexed  Treasury  securities  that are  backed by the full  faith and
credit of the U.S.  government  and indexed or otherwise  structured by the U.S.
Treasury to provide  protection against  inflation.  Inflation-indexed  Treasury
securities may be issued by the U.S.  Treasury in the form of notes or bonds. Up
to 35%  of  the  fund's  total  assets  may  be  invested  in  inflation-indexed
securities  issued  by  U.S.   government   agencies  and   government-sponsored
organizations.  Inflation-Adjusted  Treasury  also may  invest in U.S.  Treasury
securities that are not indexed to inflation for liquidity and total return,  or
if at any time the fund  managers  believe  there  is an  inadequate  supply  of
appropriate  inflation-indexed  securities  in  which  to  invest  or when  such
investments are required as a temporary  defensive  measure.  Inflation-Adjusted
Treasury's  portfolio  may  consist  of  any  combination  of  these  securities
consistent  with   investment   strategies   employed  by  the  advisor.   While
Inflation-Adjusted  Treasury seeks to provide a measure of inflation  protection
to its  investors,  there is no  assurance  that the fund will provide less risk
than a fund investing in conventional fixed-principal securities.

    There are no maturity or duration  restrictions  for the securities in which
Inflation-Adjusted   Treasury   may  invest.   The  U.S.   Treasury  has  issued
inflation-indexed  Treasury  securities  with  five-year,  10-year  and  30-year
maturities.


    Inflation-Adjusted Treasury may be appropriate for investors who are seeking
to  protect  all or a part of their  investment  portfolio  from the  effects of
inflation.

    Traditional  U.S.  Treasury  fixed-principal  notes  and  bonds pay a stated
return or rate of  interest  in dollars  and are  redeemed  at their par amount.
Inflation  during the period that the securities are  outstanding  will diminish
the future  purchasing  power of these dollars.  Inflation-Adjusted  Treasury is
designed to serve as a vehicle to protect against this diminishing effect.


    Inflation-Adjusted  Treasury is designed to provide total return  consistent
with an investment in inflation-indexed Treasury securities.  Inflation-Adjusted
Treasury's  yield will reflect both the  inflation-adjusted  interest income and
the inflation  adjustment to principal,  which are features of inflation-indexed
Treasury securities. The current income generated by Inflation-Adjusted Treasury
will vary with month-to-month  changes in the CPI index and may be substantially
more or substantially less than traditional fixed-principal securities.

    Inflation-indexed securities in which the fund may invest are relatively new
securities.  There  are  special  investment  risks,  particularly  share  price
volatility and potential adverse tax consequences, associated with investment in
inflation-indexed  securities.  These risks are described in the section  titled
"Investment  Strategies  and Risks." You should read that  section  carefully to
make sure you understand the nature of  Inflation-Adjusted  Treasury  before you
invest in it.


THE GOVERNMENT AGENCY FUNDS

SHORT-TERM GOVERNMENT


    Short-Term  Government  seeks  to  provide  investors  with a high  level of
current income  consistent  with stability of principal.  Short-Term  Government
pursues this objective by investing primarily in securities issued or guaranteed
by the U.S.  government  or its  agencies  or  instrumentalities.  Under  normal
conditions,  the fund managers  invest at least 65% of  Short-Term  Government's
total assets in securities of the U.S.  government and its agencies and maintain
a weighted average duration of three years or less.



4                                                  AMERICAN CENTURY INVESTMENTS


GNMA FUND

    The GNMA Fund seeks to provide a high  level of  current  income  consistent
with safety of principal and maintenance of liquidity by investing  primarily in
mortgage-backed Ginnie Mae certificates.


    Ginnie Mae certificates  represent  interests in pools of mortgage loans and
in the cash flows from those loans.  These  certificates  are  guaranteed by the
Government National Mortgage Association and backed by the full faith and credit
of the U.S.  government  as to the timely  payment of interest and  repayment of
principal,  which means that the GNMA Fund  receives  its share of interest  and
principal payments owed on the underlying pool of mortgage loans,  regardless of
whether borrowers make their scheduled mortgage payments.


    Assets not invested in Ginnie Mae certificates,  directly or indirectly, are
invested  in  other  U.S.   government   securities  or  repurchase   agreements
collateralized by U.S. government securities.  For temporary defensive purposes,
the GNMA Fund may invest 100% of its assets in these securities.


    A  unique  feature  of  mortgage-backed   securities,  such  as  Ginnie  Mae
certificates, is that their principal is scheduled to be paid back gradually for
the  duration  of the loan rather  than in one lump sum at  maturity.  Investors
(such as the GNMA Fund)  receive  scheduled  monthly  payments of principal  and
interest, but they also may receive unscheduled  prepayments of principal on the
underlying  mortgages.  See  "Mortgage-Backed   Securities"  on  page  6  for  a
discussion of prepayment risk.


DETAILED INFORMATION ABOUT THE FUNDS

INVESTMENT STRATEGIES AND RISKS

    This section  describes each of the investment  vehicles and strategies that
the fund managers can use in managing a fund's assets. It also details the risks
associated  with each,  because each  technique  contributes to a fund's overall
risk profile.

U.S. GOVERNMENT SECURITIES

    U.S.  Treasury bills,  notes,  zero-coupon  bonds and other bonds are direct
obligations  of the U.S.  Treasury,  which has never  failed to pay interest and
repay principal when due. Treasury bills have initial  maturities of one year or
less,  Treasury  notes  from two to 10 years,  and  Treasury  bonds more than 10
years.  Although U.S. Treasury securities carry little principal risk if held to
maturity,  the  prices of these  securities  (like all debt  securities)  change
between issuance and maturity in response to fluctuating market interest rates.

    A number of U.S. government agencies and government-sponsored  organizations
issue debt  securities.  These  agencies  generally  are  created by Congress to
fulfill a specific  need,  such as  providing  credit to home buyers or farmers.
Among these  agencies are the Federal  Home Loan Banks,  the Federal Farm Credit
Banks,  the  Student  Loan  Marketing  Association  and the  Resolution  Funding
Corporation.

    Some agency  securities  are backed by the full faith and credit of the U.S.
government,  and  some  are  guaranteed  only  by  the  issuing  agency.  Agency
securities  typically offer somewhat higher yields than U.S. Treasury securities
with similar maturities.  However,  these securities may involve greater risk of
default than securities backed by the U.S. Treasury.

    Interest  rates  on  agency  securities  may be  fixed  for the  term of the
investment  (fixed-rate agency securities) or tied to prevailing  interest rates
(floating-rate agency securities).  Interest rate resets on floating-rate agency
securities generally occur at intervals of one year or less, based on changes in
a predetermined interest rate index.


    Floating-rate agency securities  frequently have caps limiting the extent to
which coupon rates can be raised.  The price of a floating-rate  agency security
may decline if its capped coupon rate is lower than  prevailing  market interest
rates. Fixed- and floating-rate agency securities may be issued with a call date
(which permits  redemption before the maturity date). The exercise of a call may
reduce an obligation's yield to maturity. Capital Preservation may not invest in
floating-rate agency securities.


INTEREST RATE RESETS ON FLOATING-RATE U.S. GOVERNMENT AGENCY SECURITIES (ALL
FUNDS EXCEPT CAPITAL PRESERVATION)


    Interest rate resets on  floating-rate  U.S.  government  agency  securities
generally  occur at  intervals  of one year or less in  response to changes in a
predetermined  interest  rate index.  There are two main  categories of indices:
those based on U.S.  Treasury  securities  and those  derived  from a calculated
measure, such as a cost-of-funds index. Commonly used



STATEMENT OF ADDITIONAL INFORMATION                                        5



indices include the three-month,  six-month and one-year Treasury bill rate; the
two-year  Treasury note yield; the Eleventh District Federal Home Loan Bank Cost
of  Funds  Index  (EDCOFI);  and the  London  Interbank  Offered  Rate  (LIBOR).
Fluctuations in the prices of floating-rate  U.S.  government  agency securities
are  typically  attributed  to  differences  between  the coupon  rates on these
securities and  prevailing  market  interest  rates between  interest rate reset
dates.

MASTER DEMAND NOTES (GOVERNMENT AGENCY MONEY MARKET ONLY)

    Government Agency Money Market may acquire variable-rate master demand notes
issued  by  U.S.   government  agencies  such  as  the  Student  Loan  Marketing
Association.  Master  demand notes allow the fund to lend money at varying rates
of interest  under direct  agreements  with  borrowers.  The fund may adjust the
amount of money loaned under a master demand note daily or weekly up to the full
amount  specified in the  agreement,  and the borrower may prepay up to the full
amount of the loan without penalty. Master demand notes may or may not be backed
by bank letters of credit.  Although,  as direct agreements  between lenders and
borrowers,  there  is  no  secondary  market  for  master  demand  notes,  these
instruments are redeemable  (immediately  repayable by the borrower) at par plus
accrued interest at any time.


ZERO-COUPON SECURITIES (SHORT-TERM TREASURY, INTERMEDIATE-TERM TREASURY,
LONG-TERM TREASURY AND INFLATION-ADJUSTED TREASURY)

    Zero-coupon U.S. Treasury  securities are the unmatured interest coupons and
underlying  principal  portions of U.S.  Treasury  notes and bonds.  Originally,
these  securities were created by  broker-dealers  who bought Treasury notes and
bonds and deposited these  securities with a custodian bank. The  broker-dealers
then sold receipts representing  ownership interests in the coupons or principal
portions of the notes and bonds.  Some examples of zero-coupon  securities  sold
through custodial receipt programs are CATS (Certificates of Accrual on Treasury
Securities),  TIGRs  (Treasury  Investment  Growth  Receipts)  and  generic  TRs
(Treasury Receipts).

    The U.S. Treasury subsequently  introduced a program called Separate Trading
of Registered  Interest and Principal of Securities  (STRIPS).  In this program,
eligible  securities  may be presented to the U.S.  Treasury and  exchanged  for
their component  parts,  which are then traded in book-entry  form.  (Book-entry
trading eliminated the bank credit risks associated with broker-dealer sponsored
custodial  receipt   programs.)  STRIPS  are  direct  obligations  of  the  U.S.
government and have the same credit risks as other U.S. Treasury securities.

    Principal and interest on bonds issued by the Resolution Funding Corporation
(REFCORP) have also been separated and issued as stripped  securities.  The U.S.
government  and its agencies may issue  securities in  zero-coupon  form.  These
securities are referred to as original issue zero-coupon securities.

MORTGAGE-BACKED SECURITIES

BACKGROUND

    A  mortgage-backed  security  represents an ownership  interest in a pool of
mortgage loans. The loans are made by financial institutions to finance home and
other real estate purchases. As the loans are repaid, investors receive payments
of both interest and principal.

    Like fixed-income  securities such as U.S.  Treasury bonds,  mortgage-backed
securities  pay a stated  rate of  interest  during  the  life of the  security.
However,  unlike a bond, which returns principal to the investor in one lump sum
at  maturity,  mortgage-backed  securities  return  principal to the investor in
increments during the life of the security.

    Because the timing and speed of principal  repayments vary, the cash flow on
mortgage  securities  is  irregular.  If  mortgage  holders  sell  their  homes,
refinance  their loans,  prepay their  mortgages or default on their loans,  the
principal is distributed pro rata to investors.

    As with other  fixed-income  securities,  the prices of mortgage  securities
fluctuate in response to changing  interest rates; when interest rates fall, the
prices of mortgage securities rise, and vice versa. Changing interest rates have
additional  significance  for  mortgage-backed  securities  investors,  however,
because they influence  prepayment  rates (the rates at which  mortgage  holders
prepay their mortgages), which in


6                                                AMERICAN CENTURY INVESTMENTS


turn  affect the  yields on  mortgage-backed  securities.  When  interest  rates
decline, prepayment rates generally increase. Mortgage holders take advantage of
the  opportunity to refinance  their mortgages at lower rates with lower monthly
payments.  When  interest  rates rise,  mortgage  holders  are less  inclined to
refinance their mortgages. The effect of prepayment activity on yield depends on
whether  the  mortgage-backed  security  was  purchased  at a  premium  or  at a
discount.

    A fund may get back principal sooner than it expected because of accelerated
prepayments. Under these circumstances, the fund might have to reinvest returned
principal  at rates lower than it would have earned if principal  payments  were
made  on  schedule.  Conversely,  a  mortgage-backed  security  may  exceed  its
anticipated  life if  prepayment  rates  decelerate  unexpectedly.  Under  these
circumstances,  a fund  might miss an  opportunity  to earn  interest  at higher
prevailing rates.

GINNIE MAE CERTIFICATES


    Ginnie Mae is a wholly owned corporate  instrumentality of the United States
within the Department of Housing and Urban Development. The National Housing Act
of 1934 (Housing Act), as amended, authorizes Ginnie Mae to guarantee the timely
payment of interest and repayment of principal on  certificates  that are backed
by a pool of mortgage loans insured by the Federal Housing  Administration under
the  Housing  Act,  or by Title V of the  Housing  Act of 1949 (FHA  Loans),  or
guaranteed by the Veterans'  Affairs under the Servicemen's  Readjustment Act of
1944 (VA Loans),  as amended,  or by pools of other eligible mortgage loans. The
Housing Act provides  that the full faith and credit of the U.S.  government  is
pledged to the payment of all amounts  that may be required to be paid under any
guarantee.  Ginnie Mae has unlimited  authority to borrow from the U.S. Treasury
in order to meet its obligations under this guarantee.

    Ginnie Mae  certificates  represent a pro rata interest in one or more pools
of the following types of mortgage loans:  (a) fixed-rate level payment mortgage
loans; (b) fixed-rate  graduated  payment mortgage loans (GPMs);  (c) fixed-rate
growing equity mortgage loans (GEMs);  (d) fixed-rate  mortgage loans secured by
manufactured (mobile) homes (MHs); (e) mortgage loans on multifamily residential
properties  under   construction   (CLCs);   (f)  mortgage  loans  on  completed
multifamily  projects  (PLCs);  (g) fixed-rate  mortgage loans that use escrowed
funds to reduce the borrower's  monthly  payments  during the early years of the
mortgage loans (buydown mortgage loans); and (h) mortgage loans that provide for
payment  adjustments  based on periodic  changes in  interest  rates or in other
payment terms of the mortgage loans.


FANNIE MAE CERTIFICATES

    The  Federal  National  Mortgage  Association  (FNMA  or  Fannie  Mae)  is a
federally  chartered  and  privately  owned  corporation  established  under the
Federal  National  Mortgage  Association  Charter Act. Fannie Mae was originally
established in 1938 as a U.S. government agency designed to provide supplemental
liquidity to the mortgage market and was reorganized as a stockholder-owned  and
privately  managed  corporation  by  legislation  enacted  in 1968.  Fannie  Mae
acquires  capital from  investors  who would not  ordinarily  invest in mortgage
loans  directly  and thereby  expands the total  amount of funds  available  for
housing.  This money is used to buy home  mortgage  loans  from  local  lenders,
replenishing the supply of capital available for mortgage lending.


    Fannie Mae  certificates  represent a pro rata interest in one or more pools
of FHA Loans, VA Loans,  or, most commonly,  conventional  mortgage loans (i.e.,
mortgage loans that are not insured or guaranteed by a government agency) of the
following  types:  (a) fixed-rate  level payment  mortgage loans; (b) fixed-rate
growing equity mortgage loans; (c) fixed-rate  graduated payment mortgage loans;
(d) adjustable-rate mortgage loans; and (e) fixed-rate mortgage loans secured by
multifamily projects.

    Fannie Mae  certificates  entitle the registered  holder to receive  amounts
representing  a pro rata interest in scheduled  principal and interest  payments
(at the  certificate's  pass-through  rate,  which is net of any  servicing  and
guarantee fees on the underlying mortgage loans), any principal prepayments, and
a  proportionate  interest in the full  principal  amount of any  foreclosed  or
otherwise



STATEMENT OF ADDITIONAL INFORMATION                                        7


liquidated  mortgage loan. The full and timely payment of interest and repayment
of principal on each Fannie Mae  certificate  is  guaranteed by Fannie Mae; this
guarantee is not backed by the full faith and credit of the U.S.
government.

FREDDIE MAC CERTIFICATES

    The  Federal  Home Loan  Mortgage  Corporation  (FHLMC or Freddie  Mac) is a
corporate instrumentality of the United States created pursuant to the Emergency
Home Finance Act of 1970 (FHLMC Act),  as amended.  Freddie Mac was  established
primarily for the purpose of increasing the availability of mortgage credit. Its
principal activity consists of purchasing  first-lien  conventional  residential
mortgage  loans  (and  participation  interests  in  such  mortgage  loans)  and
reselling  these  loans in the  form of  mortgage-backed  securities,  primarily
Freddie Mac certificates.

    Freddie  Mac  certificates  represent  a pro  rata  interest  in a group  of
mortgage loans (a Freddie Mac certificate  group)  purchased by Freddie Mac. The
mortgage  loans  underlying  Freddie  Mac  certificates  consist  of  fixed-  or
adjustable-rate mortgage loans with original terms to maturity of between 10 and
30 years,  substantially  all of which are  secured  by  first-liens  on one- to
four-family  residential properties or multifamily projects.  Each mortgage loan
must meet standards set forth in the FHLMC Act. A Freddie Mac certificate  group
may include  whole loans,  participation  interests  in whole  loans,  undivided
interests in whole  loans,  and  participations  composing  another  Freddie Mac
certificate group.

    Freddie  Mac  guarantees  to  each  registered   holder  of  a  Freddie  Mac
certificate  the timely  payment of  interest  at the rate  provided  for by the
certificate. Freddie Mac also guarantees ultimate collection of all principal on
the related mortgage loans, without any offset or deduction,  but generally does
not guarantee the timely repayment of principal. Freddie Mac may remit principal
at any time after default on an underlying  mortgage  loan, but no later than 30
days  following  (a)  foreclosure  sale,  (b) payment of a claim by any mortgage
insurer,  or (c) the  expiration of any right of  redemption,  whichever  occurs
later,  and in any event no later than one year after  demand has been made upon
the mortgager for accelerated  payment of principal.  Obligations  guaranteed by
Freddie Mac are not backed by the full faith and credit of the U.S. government.

COLLATERALIZED MORTGAGE OBLIGATIONS (CMOS)


    A CMO is a  multiclass  bond  backed  by a  pool  of  mortgage  pass-through
certificates or mortgage loans.  CMOs may be  collateralized  by (a) Ginnie Mae,
Fannie Mae or Freddie Mac  pass-through  certificates,  (b)  unsecured  mortgage
loans  insured  by the  Federal  Housing  Administration  or  guaranteed  by the
Department of Veterans' Affairs, (c) unsecuritized  conventional  mortgages,  or
(d) any combination thereof.

    In  structuring a CMO, an issuer  distributes  cash flow from the underlying
collateral over a series of classes called tranches. Each CMO is a set of two or
more  tranches,  with  average  lives and cash flow  patterns  designed  to meet
specific investment  objectives.  The average life expectancies of the different
tranches in a four-part  deal,  for example,  might be two,  five,  seven and 20
years.


    As payments on the underlying  mortgage loans are collected,  the CMO issuer
pays the coupon rate of  interest to the  bondholders  in each  tranche.  At the
outset,  scheduled  and  unscheduled  principal  payments go to investors in the
first  tranches.  Investors in later tranches do not begin  receiving  principal
payments  until the prior tranches are paid off. This basic type of CMO is known
as a sequential pay or plain vanilla CMO.

    Some  CMOs are  structured  so that  the  prepayment  or  market  risks  are
transferred  from one tranche to another.  Prepayment  stability  is improved in
some tranches if other tranches absorb more prepayment variability.

    The final  tranche of a CMO often takes the form of a Z-bond,  also known as
an accrual bond or accretion bond.  Holders of these securities  receive no cash
until the earlier  tranches  are paid in full.  During the period that the other
tranches are outstanding,  periodic  interest  payments are added to the initial
face amount of the Z-bond but are not paid to investors. When the prior tranches
are retired, the Z-bond receives coupon payments on its higher principal balance
plus any principal prepayments from the underlying mortgage


8                                                 AMERICAN CENTURY INVESTMENTS


loans.  The existence of a Z-bond tranche helps  stabilize cash flow patterns in
the other tranches. In a changing interest rate environment,  however, the value
of the Z-bond tends to be more volatile.

    As CMOs have evolved,  some classes of CMO bonds have become more prevalent.
The planned amortization class (PAC) and targeted  amortization class (TAC), for
example,  were designed to reduce prepayment risk by establishing a sinking-fund
structure.  PAC and TAC bonds  assure to varying  degrees  that  investors  will
receive payments over a predetermined period under various prepayment scenarios.
Although  PAC and TAC bonds are  similar,  PAC bonds are better  able to provide
stable cash flows under various  prepayment  scenarios than TAC bonds because of
the order in which these tranches are paid.


    The  existence of a PAC or TAC tranche can create  higher levels of risk for
other  tranches in the CMO because  the  stability  of the PAC or TAC tranche is
achieved  by  creating at least one other  tranche--known  as a companion  bond,
support,  or non-PAC bond--that absorbs the variability of principal cash flows.
Because  companion  bonds have a high degree of average life  variability,  they
generally  pay a  higher  yield.  A TAC bond  can  have  some of the  prepayment
variability of a companion bond if there is also a PAC bond in the CMO issue.

    Floating-rate  CMO tranches  (floaters) pay a variable rate of interest that
is  usually  tied  to  the  LIBOR.   Institutional   investors  with  short-term
liabilities,  such as commercial banks, often find floating-rate CMOs attractive
investments.  Super floaters (which float a certain  percentage above LIBOR) and
inverse  floaters (which float inversely to LIBOR) are variations on the floater
structure that have highly variable cash flows.


STRIPPED MORTGAGE-BACKED SECURITIES (SHORT-TERM  GOVERNMENT ONLY)


    Stripped mortgage  securities are created by segregating the cash flows from
underlying  mortgage  loans or  mortgage  securities  to create  two or more new
securities,  each  with a  specified  percentage  of the  underlying  security's
principal or interest payments. Mortgage securities may be partially stripped so
that each  investor  class  receives  some  interest  and some  principal.  When
securities are completely stripped,  however, all of the interest is distributed
to holders of one type of security,  known as an interest-only  security, or IO,
and all of the principal is  distributed  to holders of another type of security
known  as  a  principal-only  security,  or  PO.  Strips  can  be  created  in a
pass-through structure or as tranches of a CMO.

    The market  values of IOs and POs are very  sensitive  to interest  rate and
prepayment rate fluctuations.  POs, for example, increase (or decrease) in value
as interest rates decline (or rise). The price behavior of these securities also
depends  on  whether  the  mortgage  collateral  was  purchased  at a premium or
discount to its par value. Prepayments on discount coupon POs generally are much
lower than  prepayments on premium coupon POs. IOs may be used to hedge a fund's
other investments  because prepayments cause the value of an IO strip to move in
the opposite direction from other mortgage-backed securities.

ADJUSTABLE-RATE MORTGAGE LOANS (ARMS)

    ARMs eligible for inclusion in a mortgage pool  generally will provide for a
fixed initial mortgage  interest rate for a specified period of time,  generally
for  either  the first  three,  six,  12,  24,  36, 60 or 84  scheduled  monthly
payments.  Thereafter,  the  interest  rates are subject to periodic  adjustment
based on changes in an index.


    ARMs have minimum and maximum rates beyond which the mortgage  interest rate
may not vary over the lifetime of the loan.  Certain ARMs provide for additional
limitations on the maximum amount by which the mortgage interest rate may adjust
for any  single  adjustment  period.  Negatively  amortizing  ARMs  may  provide
limitations on changes in the required monthly  payment.  Limitations on monthly
payments can result in monthly payments that are greater or less than the amount
necessary  to  amortize  a  negatively  amortizing  ARM by its  maturity  at the
interest rate in effect during any particular month.


    There  are two  types  of  indices  that  provide  the  basis  for ARM  rate
adjustments:  those  based on  market  rates  and  those  based on a  calculated
measure,  such as a  cost-of-funds  index or a moving average of mortgage rates.
Commonly  utilized  indices  include  the  one-year,  three-year  and  five-year
constant  maturity  U.S.  Treasury  rates (as  reported by the  Federal  Reserve
Board); the three-month Treasury bill rate;



STATEMENT OF ADDITIONAL INFORMATION                                         9



the 180-day Treasury bill rate; rates on longer-term  Treasury  securities;  the
Eleventh  District  Federal  Home Loan Bank Cost of Funds  Index  (EDCOFI);  the
National Median Cost of Funds Index;  the one-month,  three-month,  six-month or
one-year  LIBOR;  or  six-month  CD rates.  Some  indices,  such as the one-year
constant maturity Treasury rate or three-month LIBOR, are highly correlated with
changes in market interest rates. Other indices, such as the EDCOFI, tend to lag
behind  changes in market rates and be somewhat less volatile over short periods
of time.

    The EDCOFI  reflects the monthly  weighted  average cost of funds of savings
and loan  associations  and  savings  banks  whose home  offices  are located in
Arizona,  California  and Nevada (the Federal Home Loan Bank Eleventh  District)
and who are member  institutions  of the Federal Home Loan Bank of San Francisco
(the FHLB of San Francisco), as computed from statistics tabulated and published
by the FHLB of San Francisco.  The FHLB of San Francisco  normally announces the
Cost of Funds Index on the last working day of the month  following the month in
which the cost of funds was incurred.


    One-year  and  three-year   Constant   Maturity  Treasury  (CMT)  rates  are
calculated by the Federal  Reserve Bank of New York,  based on daily closing bid
yields  on  actively  traded  Treasury  securities  submitted  by  five  leading
broker-dealers. The median bid yields are used to construct a daily yield curve.

    The  National  Median  Cost  of  Funds  Index,  similar  to the  EDCOFI,  is
calculated  monthly by the Federal Home Loan Bank Board  (FHLBB) and  represents
the average monthly interest expenses on liabilities of member  institutions.  A
median,  rather than an arithmetic mean, is used to reduce the effect of extreme
numbers.


    LIBOR is the rate at which  banks in  London  offer  Eurodollars  in  trades
between  banks.  LIBOR has become a key rate in the U.S.  domestic  money market
because it is perceived to reflect the true global cost of money.

    The  fund  managers  may  invest  in  ARMs  whose  periodic   interest  rate
adjustments are based on new indices as these indices become available.



INFLATION-INDEXED TREASURY SECURITIES

    Inflation-indexed  Treasury  securities are Treasury securities with a final
value   and   interest   payment   stream   linked   to  the   inflation   rate.
Inflation-indexed Treasury securities may be issued in either note or bond form.
Inflation-indexed  Treasury notes have  maturities of at least one year, but not
more than 10 years.  Inflation-indexed  Treasury  bonds have  maturities of more
than 10 years.


    Inflation-indexed Treasury securities may be attractive to investors seeking
an investment  backed by the full faith and credit of the U.S.  government  that
provides  a return in excess of the rate of  inflation.  These  securities  were
first  sold  in  the  U.S.   market  in  January  1997.  See   "Development   of
Inflation-Indexed  Securities  Market"  on page 11.  Inflation-indexed  Treasury
securities are auctioned and issued on a quarterly basis.


STRUCTURE AND INFLATION INDEX


    The  principal  value  of  inflation-indexed  Treasury  securities  will  be
adjusted to reflect  changes in the level of inflation.  The index for measuring
the   inflation   rate  for   inflation-indexed   Treasury   securities  is  the
non-seasonally adjusted U.S. City Average All Items Consumer Price Index for All
Urban Consumers  published  monthly by the U.S.  Department of Labor's Bureau of
Labor Statistics.

    Semiannual  coupon interest  payments are made at a fixed  percentage of the
inflation-indexed  principal value. The coupon rate for the semiannual  interest
rate of each issuance of inflation-indexed  Treasury securities is determined at
the time the securities are sold to the public (i.e., by competitive bids in the
auction).  The coupon rate will likely  reflect  real  yields  available  in the
Treasury  market;  real  yields are the  prevailing  yields on similar  maturity
Treasury  securities  less  then-prevailing  inflation  expectations.   While  a
reduction  in inflation  will cause a reduction in the interest  payment made on
the  securities,  the  repayment of principal at the maturity of the security is
guaranteed  by the Treasury to be not less than the original  face or par amount
of the security at issuance.



10                                                 AMERICAN CENTURY INVESTMENTS


INDEXING METHODOLOGY

    The  principal  value  of  inflation-indexed  Treasury  securities  will  be
indexed,  or  adjusted,  to account for  changes in the  Consumer  Price  Index.
Semiannual coupon interest payment amounts will be determined by multiplying the
inflation-indexed  principal  amount by one-half  the stated rate of interest on
each interest payment date.

TAXATION


    Taxation applicable to  inflation-indexed  Treasury securities is similar to
conventional  bonds. Both interest payments and the difference  between original
principal  and the  inflation-adjusted  principal  will be treated  as  interest
income  subject to taxation.  Interest  payments  are taxable  when  received or
accrued. The inflation adjustment to the principal is subject to tax in the year
adjustment  is made,  not at  maturity  of the  security  when the cash from the
repayment of principal is received. If an upward adjustment has been made (which
typically should happen),  investors in non-tax-deferred accounts will pay taxes
on this amount  currently.  Decreases in the indexed  principal  can be deducted
only from current or previous interest payments reported as income.

    Inflation-indexed  Treasury securities  therefore have a potential cash flow
mismatch   to  an   investor,   because   investors   must  pay   taxes  on  the
inflation-adjusted  principal before the repayment of principal is received.  It
is  possible  that,   particularly  for  high  income  tax  bracket   investors,
inflation-indexed  Treasury  securities  would not generate  enough  income in a
given year to cover the tax  liability it could  create.  This is similar to the
current tax treatment for zero coupon bonds and other  discount  securities.  If
inflation-indexed Treasury securities are sold prior to maturity, capital losses
or gains are realized in the same manner as traditional bonds.

    Inflation-Adjusted  Treasury,  however,  distributes all income on a monthly
basis.  Investors in  Inflation-Adjusted  Treasury will receive  dividends  that
represent  both the  interest  payments  and the  principal  adjustments  of the
inflation-indexed   securities   held  in  its   portfolio.   An  investment  in
Inflation-Adjusted  Treasury  may  therefore  be a means to avoid  the cash flow
mismatch  associated with a direct investment in  inflation-indexed  securities.
For more  information  about taxes and their effect on you as an investor in the
fund, see "Taxes," on page 28.


U.S GOVERNMENT AGENCIES

    A number of U.S. government agencies and government-sponsored  organizations
may issue  inflation-indexed  securities.  Some U.S.  government  agencies  have
issued   inflation-indexed   securities   whose  design   mirrors  that  of  the
inflation-indexed Treasury securities described on the previous page.

DEVELOPMENT OF INFLATION-INDEXED SECURITIES MARKET

    The  Treasury  securities  market is the largest and most liquid  securities
market in the world. The marketability of inflation-indexed  Treasury securities
and  inflation-indexed  securities  generally  may  be  enhanced  over  time  as
additional   inflation-indexed   securities   are  issued  and  more   investors
participate in the market.

    Inflation-Adjusted  Treasury will purchase  inflation-indexed  securities at
auction  or in the  secondary  market  as the  managers  deem  appropriate.  The
secondary  market for  inflation-indexed  securities may not be as active as the
secondary market for Treasury and U.S. government agency  fixed-principal  notes
and bonds. In addition, inflation-indexed securities may not be as widely traded
or as well  understood as  fixed-principal  securities,  nor is it known at this
time exactly how the secondary market will develop.


    If  the  number  of  inflation-indexed  securities  market  participants  is
limited,  it may  result in larger  spreads  between  bid and asked  prices  for
inflation-indexed  securities  than the  bid-asked  spreads for  fixed-principal
notes and bonds with similar  terms to  maturity.  Such larger  bid-ask  spreads
normally result in higher transaction costs and/or lower returns.  If the market
does  not  develop  sufficient  liquidity,  large  buyers  or  sellers  of these
securities  may have a  disproportionately  negative  impact on the value of the
securities and, hence, Inflation-Adjusted Treasury's net asset value.


    The  managers  currently  believe  that  the  market  for  inflation-indexed
securities  will be sufficient to permit  Inflation-Adjusted  Treasury to pursue
its  investment  objective.  However,  should the  market for  inflation-indexed
securities prove less active than


STATEMENT OF ADDITIONAL INFORMATION                                       11


anticipated  by the  managers,  the  managers  are  authorized  to treat such an
environment   as  an   abnormal   market   condition.   During  such  a  period,
Inflation-Adjusted Treasury will not be fully pursuing its investment Objective.

SHARE PRICE VOLATILITY


    Inflation-indexed  securities  are  designed  to  offer a return  linked  to
inflation,  thereby  protecting future purchasing power of the money invested in
them. However,  inflation-indexed  securities provide this protected return only
if held to maturity. In addition,  inflation-indexed securities may not trade at
par value. Real interest rates (the market rate of interest less the anticipated
rate of inflation)  change over time, as a result of many factors,  such as what
investors  are  demanding as a true value for money.  When real rates do change,
inflation-indexed securities prices will be more sensitive to these changes than
conventional  bonds,  because these securities were sold originally based upon a
real interest rate that is no longer prevailing.  Should market expectations for
real interest  rates rise,  the price of  inflation-indexed  securities  and the
share price of  Inflation-Adjusted  Treasury  will fall.  Investors  in the fund
should be prepared to accept not only this share price  volatility  but also the
possible adverse tax consequences it may cause.

    An investment in securities  featuring  inflation-adjusted  principal and/or
interest  involves factors not associated with more traditional  fixed-principal
securities. Such factors include the possibility that the inflation index may be
subject  to  significant  changes,  that  changes  in the  index  may or may not
correlate to changes in interest rates generally or changes in other indices, or
that the  resulting  interest  may be greater or less than that payable on other
securities of similar  maturities.  In the event of sustained  deflation,  it is
possible that the amount of semiannual interest payments, the inflation-adjusted
principal  of the  security  and the  value  of the  stripped  components,  will
decrease.  If  any  of  these  possibilities  are  realized,  Inflation-Adjusted
Treasury's net asset value could be negatively affected.


REPURCHASE AGREEMENTS


    Each fund, with the exception of Capital  Preservation and Government Agency
Money Market, may invest in repurchase agreements when such transactions present
an attractive  short-term return on cash that is not otherwise  committed to the
purchase of securities pursuant to the investment policies of that fund.

    A  repurchase  agreement  occurs  when,  at the time the fund  purchases  an
interest-bearing  obligation,  the seller (a bank or a broker-dealer  registered
under  the  Securities  Exchange  Act of  1934)  agrees  to  repurchase  it on a
specified  date in the future at an  agreed-upon  price.  The  repurchase  price
reflects  an  agreed-upon  interest  rate  during the time the  fund's  money is
invested in the security.

    Because the security  purchased  constitutes  collateral  for the repurchase
obligation,  a repurchase  agreement can be considered a loan  collateralized by
the security purchased.  The fund's risk is the ability of the seller to pay the
agreed-upon repurchase price on the repurchase date. If the seller defaults, the
fund may incur costs in  disposing  of the  collateral,  which would  reduce the
amount realized  thereon.  If the seller seeks relief under the bankruptcy laws,
the  disposition of the collateral may be delayed or limited.  To the extent the
value of the security decreases, the fund could experience a loss.

    Each of the funds, with the exception of Capital Preservation and Government
Agency Money  Market,  may invest in repurchase  agreements  with respect to any
security  in which  that fund is  authorized  to invest,  even if the  remaining
maturity of the  underlying  security  would make that security  ineligible  for
purchase by such fund.


WHEN-ISSUED AND FORWARD COMMITMENT AGREEMENTS

    The funds may  sometimes  purchase new issues of securities 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, a
fund assumes the rights and risks of ownership, including the risks of price and
yield  fluctuations.  While the fund will make  commitments  to purchase or sell
securities with the intention of actually  receiving or delivering  them, it may
sell the securities  before the settlement date if doing so is deemed  advisable
as a matter of investment strategy.


12                                                AMERICAN CENTURY INVESTMENTS



    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, cash equivalents or other  appropriate  liquid securities in
an amount  sufficient to meet the purchase price. When the time comes to pay for
the when-issued  securities,  the fund will meet its obligations  with available
cash, through the sale of securities,  or, although it would not normally expect
to do so, by selling 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.

    As an  operating  policy,  no fund  will  commit  more 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 fund managers
need not sell such  agreements,  but they 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.


ROLL TRANSACTIONS


    A fund may  sell a  security  and at the  same  time  make a  commitment  to
purchase the same or a comparable security at a future date and specified price.
Conversely,  a  fund  may  purchase  a  security  and at the  same  time  make a
commitment  to sell  the same or a  comparable  security  at a  future  date and
specified price. These types of transactions are executed simultaneously in what
are known as  dollar-rolls,  cash and  carry,  or  financing  transactions.  For
example, a broker-dealer may seek to purchase a particular  security that a fund
owns. The fund 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 fund if the dealer is willing to
execute  the  transaction  at a  favorable  price in order to acquire a specific
security.  As  an  operating  policy,  the  advisor  limits  forward  commitment
transactions  (including roll  transactions) to 35% of a fund's total assets and
will  not  enter  into  when-issued  or  forward  commitment  transactions  with
settlement dates that exceed 120 days.


    When  engaging  in roll  transactions,  the fund  will  maintain  until  the
settlement date a segregated  account  consisting of cash or appropriate  liquid
securities  in an amount  sufficient  to meet the purchase  price,  as described
above.

SHORT-TERM SECURITIES

    Under  certain  circumstances,  the  non-money  market  funds may  invest in
short-term  municipal  or U.S.  government  securities,  including  money market
instruments  (short-term  securities).  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.
However,  the advisor  intends to minimize such  investments  and, when suitable
short-term  municipal  securities are  unavailable,  may allow the funds to hold
cash to avoid generating taxable dividends.

    Except as otherwise required for temporary defensive  purposes,  the advisor
does not  expect the  non-money  market  funds to invest  more than 35% of total
assets in short-term securities.

OTHER INVESTMENT COMPANIES


    Pursuant to an exemptive  order from the Securities and Exchange  Commission
(SEC), each non-money market fund may invest in shares of the money market funds
to facilitate cash  management,  provided that the investment is consistent with
the funds' investment policies and restrictions.


    The  non-money  market  funds may invest up to 5% of their  total  assets in
shares of the money market funds.

INVESTMENT POLICIES


    Unless otherwise indicated, with the exception of the percentage limitations
on borrowing,  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 a 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



STATEMENT OF ADDITIONAL INFORMATION                                       13



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  industrial  development  bond, if the bond were backed only by the assets
and revenues of a  non-governmental  user,  the  non-governmental  user would be
deemed the sole issuer.  If, in either case,  the  creating  government  or some
other entity were to guarantee the security, the guarantee would be considered a
separate security and treated as an issue of the guaranteeing entity.


FUNDAMENTAL INVESTMENT POLICIES


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

    For purposes of the investment restriction relating to concentration, a fund
shall not purchase any  securities  that 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.

Subject            Policy
- --------------------------------------------------------------------------------
Senior             Securities A fund may not issue senior securities,  except as
                   permitted under the Investment Company Act.
- --------------------------------------------------------------------------------
Borrowing          A fund may not borrow money, except 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).
- --------------------------------------------------------------------------------
Lending            A fund may not 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 (i) through the
                   purchase of debt securities in accordance with its
                   investment objective, policies and limitations or (ii) by
                   engaging in repurchase agreements with respect to
                   portfolio securities.
- --------------------------------------------------------------------------------
Real Estate        A fund may not purchase or sell real estate unless acquired
                   as a result of ownership of securities or other instruments.
                   This  policy  shall  not  prevent a fund  from  investing  in
                   securities  or other  instruments  backed  by real  estate or
                   securities  of  companies  that  deal in real  estate  or are
                   engaged in the real estate business.
- --------------------------------------------------------------------------------
Concentration      A fund may not concentrate its investments in securities of
                   issuers in a particular industry (other than securities
                   issued or guaranteed by the U.S. government or any of its
                   agencies or instrumentalities).
- --------------------------------------------------------------------------------
Underwriting       A fund may not serve as an 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.
- --------------------------------------------------------------------------------
Commodities        A fund may not purchase or sell physical  commodities  unless
                   acquired  as a result of  ownership  of  securities  or other
                   instruments; provided that this limitation shall not prohibit
                   the fund from  purchasing  or  selling  options  and  futures
                   contracts   or  from   investing  in   securities   or  other
                   instruments backed by physical commodities.
- --------------------------------------------------------------------------------
Control            A fund may not invest for purposes of exercising control over
                   management.



14                                                  AMERICAN CENTURY INVESTMENTS


NONFUNDAMENTAL INVESTMENT POLICIES


  In  addition,  the funds are subject to the  following  additional  investment
restrictions  that  are not  fundamental  and may be  changed  by the  Board  of
Trustees.


Subject            Policy
- --------------------------------------------------------------------------------
Diversification    A fund may not purchase additional investment securities at
                   any time during which outstanding borrowings exceed 5% of the
                   total assets of the fund.
- --------------------------------------------------------------------------------
Liquidity          A fund may not 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.
- --------------------------------------------------------------------------------
Short Sales        A fund may not 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 transactions
                   in futures contracts and options are not deemed to
                   constitute selling securities short.
- --------------------------------------------------------------------------------
Margin             A fund may not purchase securities on margin, except to
                   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.
- --------------------------------------------------------------------------------


    The Investment  Company Act imposes  certain  additional  restrictions  upon
acquisition  by  the  funds  of  securities   issued  by  insurance   companies,
broker-dealers,  underwriters or investment advisors, and upon transactions with
affiliated persons as therein defined.  It also defines and forbids the creation
of cross and  circular  ownership.  Neither the SEC nor any other  agency of the
federal or state government  participates in or supervises the management of the
funds or their investment practices or policies.

    The Investment  Company Act also provides that the funds may not invest more
than 25% of their  assets  in the  securities  of  issuers  engaged  in a single
industry.  In determining industry groups for purposes of this restriction,  the
SEC ordinarily uses the Standard Industry  Classification codes developed by the
United  States  Office of  Management  and Budget.  In the  interest of ensuring
adequate diversification,  the funds monitor industry concentration using a more
restrictive  list of industry groups than that recommended by the SEC. The funds
believe that these  classifications are reasonable and are not so broad that the
primary  economic  characteristics  of  the  companies  in a  single  class  are
materially different. The use of these restrictive industry classifications may,
however,  cause the funds to forego investment  possibilities that may otherwise
be available to them under the Investment Company Act.


TEMPORARY DEFENSIVE MEASURES

    For temporary defensive  purposes,  a fund may invest in securities that may
not fit its  investment  objective  or its  stated  market.  During a  temporary
defensive  period,  a fund may  direct its  assets to the  following  investment
vehicles:


    * interest-bearing bank accounts or certificates of deposit


    * U.S. government securities and repurchase agreements collateralized by
      U.S. government securities

    * money market funds

PORTFOLIO TURNOVER


    Under normal conditions,  the funds' annual portfolio turnover rates are not
expected to exceed 100%.  Because a higher  turnover rate increases  transaction
costs and may increase taxable capital gains,  the managers  carefully weigh the
potential benefits of short-term investing against these considerations.


    The funds' portfolio turnover rates (except those of the money market funds)
are listed in the Financial  Highlights table in the Prospectus.  Because of the
short-term nature of the money market funds' invest-


STATEMENT OF ADDITIONAL INFORMATION                                        15



ments, portfolio turnover rates generally are not used to evaluate their trading
activities.


MANAGEMENT

THE BOARD OF TRUSTEES

    The Board of  Trustees  oversees  the  management  of the funds and meets at
least quarterly to review reports about fund  operations.  Although the Board of
Trustees  does  not  manage  the  funds,  it has  hired  the  advisor  to do so.
Two-thirds of the trustees are independent of the funds' advisor;  that is, they
are not employed by and have no financial interest in the advisor.

    The  individuals  listed in the following table whose names are marked by an
asterisk (*) are interested persons of the funds (as defined in the Investment


Name (Age)                Position(s)     Principal Occupation(s)
Address                   Held            During Past Five Years
                          With Fund
- --------------------------------------------------------------------------------
Albert A. Eisenstat (69)  Trustee         Independent Director, Commercial
1665 Charleston Road                      Metals Co. (1982 to present)
Mountain View, CA  94043                  Independent Director, Sungard Data
                                          Systems  (1991  to  present)   General
                                          Partner,  Discovery  Ventures (venture
                                          capital    firm,    1996   to    1998)
                                          Independent Director, Business Objects
                                          S/A (software &  programming,  1994 to
                                          present)
- --------------------------------------------------------------------------------
Ronald J. Gilson (52)     Trustee         Charles J. Meyers Professor of Law
1665 Charleston Road                      and Business, Stanford Law School
Mountain View, CA  94043                  (1979 to present)
                                          Marc and Eva Stern Professor of Law
                                          and Business, Columbia University
                                          School of Law (1992 to present)
                                          Counsel, Marron, Reid & Sheehy (a San
                                          Francisco law firm, 1984 to present)
- --------------------------------------------------------------------------------
William M. Lyons* (43)    Trustee         President, Chief Operating Officer and
4500 Main Street                          Assistant Secretary, ACC
Kansas City, MO 64111                     Executive Vice President, Chief
                                          Operating Officer and Secretary,
                                          ACSC and ACIS
- --------------------------------------------------------------------------------
Myron S. Scholes (58)     Trustee         Limited Partner, Long-Term Capital
1665 Charleston Road                      Management (since February 1999)
Mountain View, CA 94043                   Principal, Long-Term Capital
                                          Management  (investment advisor,  1993
                                          To   January   1999)   Frank  E.  Buck
                                          Professor    of   Finance,    Stanford
                                          Graduate  School of Business  (1981 to
                                          present)  Director,  Dimensional  Fund
                                          Advisors (investment advisor,  1982 to
                                          present)   Director,   Smith   Breeden
                                          Family of Funds (1992 to present)
- --------------------------------------------------------------------------------
Kenneth E. Scott (70)     Trustee         Ralph M. Parsons Professor of Law and
1665 Charleston Road                      Business, Stanford Law School
Mountain View, CA  94043                  (1972 to present)
                                          Director, RCM Capital Funds, Inc.
                                          (1994 to present)
- --------------------------------------------------------------------------------
Isaac Stein (52)          Trustee         Director, Raychem Corporation
1665 Charleston Road                      (electrical equipment, since 1993)
Mountain View, CA  94043                  President, Waverley Associates, Inc.
                                          (private   investment  firm,  1983  to
                                          present)  Director,  ALZA  Corporation
                                          (pharmaceuticals,   1987  to  present)
                                          Trustee,  Stanford University (1994 to
                                          present)  Chairman,   Stanford  Health
                                          Services (1994 to present)
- --------------------------------------------------------------------------------
James E. Stowers III* (40) Trustee,       Chief Executive Officer and
4500 Main Street           Chairman of    Director, ACC
Kansas City, MO 64111      the Board      President, Chief Executive Officer
                                          and Director, ACSC and ACIS
                                          Son of James E. Stowers, Jr. (founder)
- --------------------------------------------------------------------------------
Jeanne D. Wohlers (54)     Trustee        Director, Indus International
1665 Charleston Road                      (software solutions, January 1999
Mountain View, CA  94043                  to present)
                                          Director and Partner, Windy Hill
                                          Productions, LP (educational software,
                                          1994  to   1998)   Director,   Quintus
                                          Corporation,   (automation  solutions,
                                          1995 to present)
- --------------------------------------------------------------------------------



16                                              AMERICAN CENTURY INVESTMENTS



Company Act) by virtue of, among other  considerations,  their  affiliation with
either the funds; the advisor, American Century Investment Management, Inc.; the
funds' agent for transfer and administrative services, American Century Services
Corporation  (ACSC); the parent  corporation,  American Century Companies,  Inc.
(ACC) or ACC's subsidiaries; the funds' distribution agent and co-administrator,
Funds  Distributor,  Inc.  (FDI);  or other funds  advised by the advisor.  Each
trustee  listed  below  serves  as a trustee  or  director  of seven  registered
investment  companies in the American  Century  family of funds,  which are also
advised by the advisor.


COMMITTEES


    The Board has four  committees to oversee  specific  functions of the funds'
operations.  Information about these committees  appears in the table below. The
trustee first named serves as chairman of the committee:

Committee       Members              Function of Committee
- --------------------------------------------------------------------------------
Audit           Jeanne D. Wohlers    The Audit Committee selects and oversees
                Albert A. Eisenstat  the activities of the Trust's independent
                Kenneth E. Scott     auditor. The committee receives reports
                                     from  the  advisor's   Internal   Audit
                                     Department, which is accountable solely to
                                     the committee.  The committee also receives
                                     reporting  about  compliance  matters
                                     affecting the Trust.
- --------------------------------------------------------------------------------
Nominating      Kenneth E. Scott     The Nominating Committee primarily
                Myron S. Scholes     considers and recommends individuals for
                Albert A. Eisenstat  nomination as trustees. The names of
                Ronald J. Gilson     potential trustee candidates are drawn
                Isaac Stein          from a number of sources, including
                Jeanne D. Wohlers    recommendations from Board members,
                                     management and shareholders. This committee
                                     also reviews and makes recommendations to
                                     the Board with respect to the composition
                                     of Board committees and other Board-related
                                     matters, including its organization, size,
                                     composition, responsibilities, functions
                                     and compensation.
- --------------------------------------------------------------------------------
Portfolio       Myron S. Scholes     The Portfolio Committee reviews quarterly
                Ronald J. Gilson     the investment activities and strategies
                Isaac Stein          used to manage fund assets. The committee
                                     regularly receives reports from portfolio
                                     managers, credit analysts and other
                                     investment personnel concerning the fund's
                                     investments.
- --------------------------------------------------------------------------------
Quality of      William Lyons        The Quality of Service Committee reviews
Service         Ronald J. Gilson     the level and quality of transfer agent
                Myron S. Scholes     and administrative services provided to
                Isaac Stein          the funds and their shareholders. It
                                     Receives and reviews reports comparing
                                     Those  services to fund competitors and
                                     seeks  to  improve such services where
                                     feasible and appropriate.
- --------------------------------------------------------------------------------



STATEMENT OF ADDITIONAL INFORMATION                                       17


COMPENSATION OF TRUSTEES


    The trustees  also serve as trustees or directors  for six American  Century
investment  companies other than American Century  Government Income Trust. Each
trustee who is not an interested person as defined in the Investment Company Act
receives  compensation  for  service  as a member of the Board of all seven such
companies  based on a schedule  that takes into  account  the number of meetings
attended and the assets of the funds for which the meetings are held. These fees
and expenses are divided among the seven  investment  companies  based, in part,
upon their relative net assets. Under the terms of the management agreement with
the advisor, the funds are responsible for paying such fees and expenses.

    The table presented shows the aggregate  compensation  paid by the Trust for
the periods indicated and by the seven investment companies served by this Board
to each  trustee who is not an  interested  person as defined in the  Investment
Company Act.


Aggregate Director Compensation for Fiscal Year Ended March 31, 1999
- -------------------------------------------------------------------------------
                                   Total              Total Compensation
                               Compensation                from the
                                 from the              American Century
Name of Trustee                  Funds (1)            Family of Funds(2)
- -------------------------------------------------------------------------------
Albert A. Eisenstat              $18,924                   $72,750
Ronald J. Gilson                 $21,377                   $81,500
Myron S. Scholes                 $17,971                   $70,250
Kenneth E. Scott                 $21,531                   $81,500
Isaac Stein                      $18,252                   $76,750
Jeanne D. Wohlers                $20,948                   $79,750
- -------------------------------------------------------------------------------


(1)  Includes  compensation  paid to the  trustees  during the fiscal year ended
March 31,  1999,  and also  includes  amounts  deferred  at the  election of the
trustees under the American Century Mutual Funds Deferred  Compensation Plan for
Non-Interested Directors and Trustees. The total amount of deferred compensation
included in the  preceding  table is as follows:  Mr.  Eisenstat,  $18,924;  Mr.
Gilson, $21,377; Mr. Scholes, $17,971, and Mr. Scott, $10,766.


(2) Includes  compensation  paid by the seven investment  company members of the
American Century family of funds served by this Board


    The funds have adopted the American Century Deferred  Compensation  Plan for
Non-Interested  Directors and Trustees. Under the plan, the independent trustees
may defer  receipt of all or any part of the fees to be paid to them for serving
as trustees of the funds.

    All deferred fees are credited to an account  established in the name of the
trustees.  The amounts credited to the account then increase or decrease, as the
case may be, in accordance  with the  performance of one or more of the American
Century funds that are selected by the trustee. The account balance continues to
fluctuate in accordance with the performance of the selected fund or funds until
final  payment of all amounts  credited to the account.  Trustees are allowed to
change their designation of mutual funds from time to time.

    No deferred fees are payable until such time as a trustee  resigns,  retires
or  otherwise  ceases  to be a member  of the Board of  Trustees.  Trustees  may
receive  deferred  fee  account  balances  either  in a lump sum  payment  or in
substantially equal installment  payments to be made over a period not to exceed
10 years.  Upon the death of a  trustee,  all  remaining  deferred  fee  account
balances are paid to the  trustee's  beneficiary  or, if none,  to the trustee's
estate.

    The plan is an unfunded plan and, accordingly,  the funds have no obligation
to segregate  assets to secure or fund the deferred fees. The rights of trustees
to receive their  deferred fee account  balances are the same as the rights of a
general unsecured  creditor of the funds. The plan may be terminated at any time
by the  administrative  committee of the plan. If  terminated,  all deferred fee
account balances will be paid in a lump sum.


    No deferred  fees were paid to any trustee  under the plan during the fiscal
year ended March 31, 1999.

OFFICERS


    Background  information  for the  officers  of the funds is  provided in the
following  table.  All  persons  named as  officers  of the Trust  also serve in
similar  capacities for the 12 other investment  companies  advised by ACIM. Not
all officers of the Trust are listed;  only those  officers  with  policy-making
functions  for the funds are listed.  No officer is  compensated  for his or her
service  as an officer of the  funds.  The  individuals  listed in the table are
interested  persons of the funds (as defined in the  Investment  Company Act) by
virtue of, among other considerations,  their affiliation with either the funds,
ACC,  ACC's  subsidiaries  (including  ACIM and ACSC) or the funds'  distributor
(FDI).



18                                                 AMERICAN CENTURY INVESTMENTS



                        Position(s)
Name (Age)              Held With    Principal Occupation(s)
Address                 Fund         During Past Five Years
- --------------------------------------------------------------------------------
George A. Rio (44)      President    Executive Vice President and Director of
60 State Street,                     Client Services, FDI (March 1998
Suite 1300                           to present)
Boston, Massachusetts                Senior Vice President and Senior Key
02109                                Account Manager, Putnam Mutual Funds
                                     (June 1995 to March 1998)
                                     Director Business Development, First Data
                                     Corporation (May 1994 to June 1995)
- --------------------------------------------------------------------------------
Christopher J.          Vice         Vice President and Associate General
Kelley (34)             President    Counsel, FDI (July 1996 to present)
60 State Street,                     Assistant Counsel, Forum Financial Group
Suite 1300                           (April 1994 to July 1996)
Boston, Massachusetts
02109
- --------------------------------------------------------------------------------
Mary A. Nelson (35)     Vice         Vice President and Manager of Treasury
60 State Street,        President    Services and Administration, FDI (1994
Suite 1300                           to present)
Boston, Massachusetts                Assistant Vice President and Client
02109                                Manager, The Boston Company, Inc.
                                     (1989 to 1994)
- --------------------------------------------------------------------------------
Maryanne Roepke,        Vice         Senior Vice President, Treasurer and
CPA (43)                President    Principal Accounting Officer, ACSC
4500 Main Street        and
Kansas City,            Treasurer
Missouri 64111
- --------------------------------------------------------------------------------
David C. Tucker (41)    Vice         Senior Vice President and General Counsel,
4500 Main Street        President    ACSC and ACIM (June 1998 to present)
Kansas City, MO 64111                General Counsel, ACC (June 1998 to present)
                                     Consultant  to mutual  fund  industry  (May
                                     1997 to  April  1998)  Vice  President  and
                                     General  Counsel,  Janus Companies (1990 to
                                     May 1997)
- --------------------------------------------------------------------------------
Douglas A. Paul (52)    Secretary    Vice President and Associate General
1665 Charleston Road    and          Counsel, ACSC
Mountain View,          Vice
CA  94043               President
- --------------------------------------------------------------------------------
C. Jean Wade (35)       Controller   Controller-Fund Accounting, ACSC
4500 Main Street
Kansas City, MO 64111
- --------------------------------------------------------------------------------
Jon Zindel (32)         Tax Officer  Vice President and Director of Taxation,
4500 Main Street                     ACSC (since 1996)
Kansas City, MO 64111                Tax Manager, Price Waterhouse LLP (1989
                                     to 1996)
- --------------------------------------------------------------------------------



STATEMENT OF ADDITIONAL INFORMATION                                         19


THE FUNDS' PRINCIPAL SHAREHOLDERS

  As of June 30, 1999,  the following  companies  were the record owners of more
than 5% of a fund's outstanding shares:


                                                                   Percentage
                                                                   of Shares
Fund                   Shareholder                                 Outstanding
- --------------------------------------------------------------------------------
GNMA                   Charles Schwab & Company,                   27.2%
                       San Francisco, California
- --------------------------------------------------------------------------------
Short-Term Government  Stowers Institute for Medical Research,     38.0%
                       Kansas City, Missouri
- --------------------------------------------------------------------------------
Short-Term Government  Nationwide 401(k) Public,                    5.4%
                       Nationwide Insurance Co.,
                       Columbus, Ohio
- --------------------------------------------------------------------------------
Short-Term Treasury    Charles Schwab & Company,                   18.1%
                       San Francisco, California
- --------------------------------------------------------------------------------
Intermediate-Term      Charles Schwab & Company,                   16.2%
Treasury               San Francisco, California
- --------------------------------------------------------------------------------
Intermediate-Term      Chase Manhattan NA, Trustee                  6.2%
Treasury               for Lorillard Inc.
                       Hourly Paid Employees Profit Sharing,
                       New York, New York
- --------------------------------------------------------------------------------
Long-Term Treasury     Charles Schwab & Company,                   29.2%
                       San Francisco, California
- --------------------------------------------------------------------------------
Inflation-Adjusted     Charles Schwab & Company,                   20.2%
Treasury               San Francisco, California
- --------------------------------------------------------------------------------


    The funds are unaware of any other  shareholders,  beneficial  or of record,
who own more than 5% of a fund's  outstanding  shares.  As of June 30, 1999, the
officers and trustees of the funds,  as a group,  own less than 1% of any fund's
outstanding shares.

SERVICE PROVIDERS


    The funds have no employees. To conduct its day-to-day activities, the funds
have hired a number of service  providers.  Each service provider has a specific
function to fill on behalf of the funds and is described below.

    ACIM and ACSC are both wholly owned by ACC. James E. Stowers,  Jr., Chairman
of ACC,  controls  ACC by virtue of his  ownership  of a majority  of its voting
stock.


INVESTMENT ADVISOR


    A  description  of  the  responsibilities  of  the  advisor  appears  in the
Prospectus under the caption "Management."

    For the services  provided to the funds,  the advisor receives a monthly fee
based on a percentage of the average net assets of the fund.  The annual rate at
which this fee is assessed is determined monthly in a two-step process. First, a
fee rate schedule is applied to the assets of all of the funds of its investment
category managed by the advisor (the Investment Category Fee). For example, when
calculating  the fee for a money  market  fund,  all of the  assets of the money
market  funds  managed  by the  advisor  are  aggregated.  The three  investment
categories  are money  market  funds,  bond funds and equity  funds.  Second,  a
separate fee rate  schedule is applied to the assets of all of the funds managed
by the advisor (the Complex Fee).  The  Investment  Category Fee and the Complex
Fee are then added to determine the unified  management  fee payable by the fund
to the advisor.


    The schedules by which the  Investment  Category Fees are  determined are as
follows:

INVESTMENT CATEGORY FEE SCHEDULE FOR

* Capital Preservation
* Government Agency Money Market

Category Assets                      Fee Rate
- --------------------------------------------------------------------------------
First $1 billion                     0.2500%
- --------------------------------------------------------------------------------
Next $1 billion                      0.2070%
- --------------------------------------------------------------------------------
Next $3 billion                      0.1660%
- --------------------------------------------------------------------------------
Next $5 billion                      0.1490%
- --------------------------------------------------------------------------------
Next $15 billion                     0.1380%
- --------------------------------------------------------------------------------
Next $25 billion                     0.1375%
- --------------------------------------------------------------------------------
Thereafter                           0.1370%


20                         AMERICAN CENTURY INVESTMENTS


INVESTMENT CATEGORY FEE SCHEDULE FOR

* Short-Term Treasury
* Intermediate-Term Treasury
* Long-Term Treasury
* Inflation-Adjusted Treasury

Category Assets                      Fee Rate
- --------------------------------------------------------------------------------
First $1 billion                     0.2800%
- --------------------------------------------------------------------------------
Next $1 billion                      0.2280%
- --------------------------------------------------------------------------------
Next $3 billion                      0.1980%
- --------------------------------------------------------------------------------
Next $5 billion                      0.1780%
- --------------------------------------------------------------------------------
Next $15 billion                     0.1650%
- --------------------------------------------------------------------------------
Next $25 billion                     0.1630%
- --------------------------------------------------------------------------------
Thereafter                           0.1625%
- --------------------------------------------------------------------------------


INVESTMENT CATEGORY FEE SCHEDULE FOR


* Short-Term Government
* GNMA

Category Assets                      Fee Rate
- --------------------------------------------------------------------------------
First $1 billion                     0.3600%
- --------------------------------------------------------------------------------
Next $1 billion                      0.3080%
- --------------------------------------------------------------------------------
Next $3 billion                      0.2780%
- --------------------------------------------------------------------------------
Next $5 billion                      0.2580%
- --------------------------------------------------------------------------------
Next $15 billion                     0.2450%
- --------------------------------------------------------------------------------
Next $25 billion                     0.2430%
- --------------------------------------------------------------------------------
Thereafter                           0.2425%
- --------------------------------------------------------------------------------



    The Complex Fee is determined according to the schedule below.

COMPLEX FEE SCHEDULE

                                     Investor Class       Advisor Class
Complex Assets                       Fee Rate             Fee Rate
- --------------------------------------------------------------------------------
First $2.5 billion                   0.3100%              0.0600%
- --------------------------------------------------------------------------------
Next $7.5 billion                    0.3000%              0.0500%
- --------------------------------------------------------------------------------
Next $15.0 billion                   0.2985%              0.0485%
- --------------------------------------------------------------------------------
Next $25.0 billion                   0.2970%              0.0470%
- --------------------------------------------------------------------------------
Next $50.0 billion                   0.2960%              0.0460%
- --------------------------------------------------------------------------------
Next $100.0 billion                  0.2950%              0.0450%
- --------------------------------------------------------------------------------
Next $100.0 billion                  0.2940%              0.0440%
- --------------------------------------------------------------------------------
Next $200.0 billion                  0.2930%              0.0430%
- --------------------------------------------------------------------------------
Next $250.0 billion                  0.2920%              0.0420%
- --------------------------------------------------------------------------------
Next $500.0 billion                  0.2910%              0.0410%
- --------------------------------------------------------------------------------
Thereafter                           0.2900%              0.0400%


    On the first  business day of each month,  the funds pay a management fee to
the  advisor  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 a 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).

    The management  agreement  shall continue in effect until the earlier of the
expiration  of two  years  from the date of its  execution  or until  the  first
meeting of  shareholders  following such execution and for as long thereafter as
its  continuance  is  specifically  approved at least annually by (1) the funds'
Board of Trustees, or by the vote of a majority of outstanding votes (as defined
in the Investment Company Act) and (2) by the vote of a majority of the trustees
of the funds who are not parties to the agreement or  interested  persons of the
advisor,  cast in person at a meeting  called for the  purpose of voting on such
approval.

    The  management  agreement  provides  that it may be  terminated at any time
without payment of any penalty by the funds' Board of Trustees,  or by a vote of
a majority of outstanding votes, on 60 days' written notice to the advisor,  and
that it shall be automatically terminated if it is assigned.


    The  management  agreement  provides that the advisor shall not be liable to
the funds or their shareholders for anything other than willful misfeasance, bad
faith, gross negligence or reckless disregard of its obligations and duties.

    The  management  agreement  also provides that the advisor and its officers,
trustees and employees may engage in other  business,  devote time and attention
to any other  business  whether of a similar or  dissimilar  nature,  and render
services to others.

    Certain  investments  may be  appropriate  for the  funds and also for other
clients  advised by the advisor.  Investment  decisions  for the funds and other
clients are made with a view to achieving their respective investment objectives
after  consideration of such factors as their current holdings,  availability of
cash for investment  and the size of their  investment  generally.  A particular
security  may be bought or sold for only one  client  or fund,  or in  different
amounts and at different times for more than one but


STATEMENT OF ADDITIONAL INFORMATION                                   21



less than all  clients or funds.  In  addition,  purchases  or sales of the same
security  may be made for two or more  clients or funds on the same  date.  Such
transactions will be allocated among clients in a manner believed by the advisor
to be  equitable  to each.  In some cases this  procedure  could have an adverse
effect on the price or amount of the securities purchased or sold by a fund.

    The  advisor  may  aggregate  purchase  and sale  orders of the  funds  with
purchase  and sale orders of its other  clients when the advisor  believes  that
such  aggregation  provides  the best  execution  for the  funds.  The  Board of
Trustees has approved the policy of the advisor with respect to the  aggregation
of portfolio  transactions.  Where portfolio  transactions have been aggregated,
the funds  participate at the average share price for all  transactions  in that
security on a given day and share  transaction  costs on a pro rata  basis.  The
advisor  will not  aggregate  portfolio  transactions  of the  funds  unless  it
believes such  aggregation is consistent with its duty to seek best execution on
behalf  of the  funds and the terms of the  management  agreement.  The  advisor
receives  no  additional  compensation  or  remuneration  as a  result  of  such
aggregation.


    Prior to  August  1,  1997,  Benham  Management  Corporation  served  as the
investment advisor to the funds.  Benham Management  Corporation was merged into
the advisor in late 1997.


    Unified management fees paid by each fund for the fiscal periods ended March
31, 1999, 1998, and 1997, are indicated in the following tables. Fee amounts are
net of amounts  reimbursed  or  recouped  under the funds'  previous  investment
advisory agreement with Benham Management Corporation.



UNIFIED MANAGEMENT FEES (INVESTOR CLASS)


Fund                                        1999(1)            1998(2)
- --------------------------------------------------------------------------
Capital Preservation                     $15,124,623         $8,807,865
- --------------------------------------------------------------------------
Government Agency Money Market             2,378,090          1,507,123
- --------------------------------------------------------------------------
Short-Term Treasury                          253,445            134,030
- --------------------------------------------------------------------------
Intermediate-Term Treasury                 2,110,741          1,222,541
- --------------------------------------------------------------------------
Long-Term Treasury                           674,494            406,234
- --------------------------------------------------------------------------
Inflation-Adjusted Treasury                   34,313             10,682
- --------------------------------------------------------------------------
Short-Term Government                      4,822,297       1,623,040(3)
- --------------------------------------------------------------------------
GNMA Fund                                  7,901,686          4,819,669

UNIFIED MANAGEMENT FEES (ADVISOR CLASS)

Fund                                        1999             1998
- -------------------------------------------------------------------------------
Government Agency Money Market              N/A              N/A
- -------------------------------------------------------------------------------
Short-Term Treasury                         $6,318           $1,354
- -------------------------------------------------------------------------------
Intermediate-Term Treasury                   4,242              129
- -------------------------------------------------------------------------------
Long-Term Treasury                           2,929               93
- -------------------------------------------------------------------------------
Inflation-Adjusted Treasury                     20                0
- -------------------------------------------------------------------------------
Short-Term Government                           75                0
- -------------------------------------------------------------------------------
GNMA Fund                                   11,247              265


INVESTMENT ADVISORY FEES


Fund                                        1998(1)(4)           1997(1)
- -------------------------------------------------------------------------------
Capital Preservation                        $3,186,164        $8,107,075
- -------------------------------------------------------------------------------
Government Agency
Money Market                                   421,950         1,441,378
- -------------------------------------------------------------------------------
Short-Term Treasury                             33,673            77,935
- -------------------------------------------------------------------------------
Intermediate-Term Treasury                     297,794           881,647
- -------------------------------------------------------------------------------
Long-Term Treasury                             122,690           339,340
- -------------------------------------------------------------------------------
Inflation-Adjusted Treasury                      7,212                 0
- -------------------------------------------------------------------------------
Short-Term Government                                0         2,460,469
- -------------------------------------------------------------------------------
GNMA Fund                                    1,078,109         3,115,478


(1) Net of reimbursements or waivers.

(2) For the period  August 1, 1997,  to March 31,  1998.  Fees paid  during this
period were paid under the Management Agreement with American Century Investment
Management, Inc.

(3) Short-Term Government's fiscal year end was changed from October 31 to March
31 resulting in a five month annual reporting period.

(4) For the period April 1, 1997, to July 31, 1997. Fees paid during this period
were  paid  under the  Investment  Advisory  Agreement  with  Benham  Management
Corporation.


22                                               AMERICAN CENTURY INVESTMENTS


OTHER ADVISORY RELATIONSHIPS


    In addition to managing the funds,  the advisor also serves as an investment
advisor  to  seven  institutional  accounts  and  to  the  following  registered
investment companies:

* American Century Mutual Funds, Inc.
* American Century World Mutual Funds, Inc.
* American Century Premium Reserves, Inc.
* American Century Variable Portfolios, Inc.
* American Century Capital Portfolios, Inc.
* American Century Strategic Asset Allocations, Inc.
* American Century Municipal Trust
* American Century California Tax-Free and Municipal Funds
* American Century Investment Trust
* American Century Target Maturities Trust
* American Century Quantitative Equity Funds
* American Century International Bond Funds


TRANSFER AGENT AND ADMINISTRATOR


    American  Century  Services  Corporation,  4500 Main  Street,  Kansas  City,
Missouri  64111,  serves as  transfer  agent and  dividend-paying  agent for the
funds.  It provides  physical  facilities,  computer  hardware  and software and
personnel,  for the day-to-day  administration  of the funds and of the advisor.
The advisor pays American Century Services Corporation for such services.


    Prior  to  August  1,  1997,  the  funds  paid  American   Century  Services
Corporation  directly  for its  services  as transfer  agent and  administrative
services agent.

    Administrative  service  and  transfer  agent fees paid by each fund for the
fiscal years ended March 31, 1998 and 1997, are indicated in the table below.
Fee amounts are net of expense limitations.

ADMINISTRATIVE FEES


Fund                                         1998                  1997
- --------------------------------------------------------------------------------
Capital Preservation                       $1,146,326           $2,871,948
- --------------------------------------------------------------------------------
Government Agency
Money Market                                  144,980              459,802
- --------------------------------------------------------------------------------
Short-Term Treasury                            11,573               33,371
- --------------------------------------------------------------------------------
Intermediate-Term Treasury                    101,989              300,336
- --------------------------------------------------------------------------------
Long-Term Treasury                             41,622              112,936
- --------------------------------------------------------------------------------
Inflation-Adjusted Treasury                         0                    0
- --------------------------------------------------------------------------------
Short-Term Government                             N/A                  N/A
- --------------------------------------------------------------------------------


GNMA Fund                                     359,302            1,059,314

TRANSFER AGENT FEES


Fund                                           1998                1997
- --------------------------------------------------------------------------------
Capital Preservation                         $933,109            2,449,205
- --------------------------------------------------------------------------------
Government Agency
Money Market                                  163,368              553,760
- --------------------------------------------------------------------------------
Short-Term Treasury                            11,510               34,555
- --------------------------------------------------------------------------------
Intermediate-Term Treasury                     77,150              258,334
- --------------------------------------------------------------------------------
Long-Term Treasury                             66,019              181,017
- --------------------------------------------------------------------------------
Inflation-Adjusted Treasury                       646                    0
- --------------------------------------------------------------------------------
Short-Term Government                             N/A                  N/A
- --------------------------------------------------------------------------------
GNMA Fund                                     381,757            1,150,565


DISTRIBUTOR

    The funds' shares are  distributed by FDI, a registered  broker-dealer.  The
distributor  is a wholly  owned,  indirect  subsidiary  of Boston  Institutional
Group,  Inc. The  distributor's  principal  business address is 60 State Street,
Suite 1300, Boston, Massachusetts 02109.

    The  distributor  is the principal  underwriter  of the funds'  shares.  The
distributor makes a continuous,  best efforts underwriting of the funds' shares.
This means that the distributor has no liability for unsold shares.


STATEMENT OF ADDITIONAL INFORMATION                                      23


OTHER SERVICE PROVIDERS

CUSTODIAN BANKS

    Chase  Manhattan  Bank,  770  Broadway,  10th  Floor,  New  York,  New  York
10003-9598,  and Commerce Bank, N.A., 1000 Walnut,  Kansas City, Missouri 64105,
each serves as custodian of the assets of the funds. The custodians take no part
in  determining  the  investment  policies  of the  funds or in  deciding  which
securities are purchased or sold by the funds. The funds, however, may invest in
certain  obligations  of  the  custodians  and  may  purchase  or  sell  certain
securities from or to the custodians.


INDEPENDENT ACCOUNTANT

    PricewaterhouseCoopers  LLP  serves as the  independent  accountants  of the
funds. The address of  PricewaterhouseCoopers  LLP is 1055 Broadway, 10th floor,
Kansas  City,  Missouri  64105.  As the  independent  accountants  of the funds,
PricewaterhouseCoopers  provides  services  including  (1)  audit of the  annual
financial   statements  for  each  fund,  (2)  assistance  and  consultation  in
connection  with SEC  filings  and (3) review of the annual  federal  income tax
return filed for each fund.


    KPMG Peat Marwick LLP, 1000 Walnut, Suite 1600, Kansas City, Missouri 64106,
served as independent  accountants for the funds for the fiscal year ended March
31, 1997, and for all prior periods.

BROKERAGE ALLOCATION


    Under the  management  agreement  between  the funds  and the  advisor,  the
advisor  has the  responsibility  of  selecting  brokers  and dealers to execute
portfolio  transactions.  In many  transactions,  the selection of the broker or
dealer  is  determined  by the  availability  of the  desired  security  and its
offering price. In other transactions,  the selection of a broker or dealer is a
function of the selection of market and the negotiation of price, as well as the
broker's  general  execution and operational  and financial  capabilities in the
type of transaction  involved.  The advisor will seek to obtain prompt execution
of orders at the most  favorable  prices or yields.  The  advisor  may choose to
purchase and sell portfolio  securities to and from dealers who provide services
or research,  statistical and other information to the funds and to the advisor.
Such  information  or  services  will be in  addition  to and not in lieu of the
services  required  to be  performed  by the  advisor,  and the  expenses of the
advisor  will not  necessarily  be  reduced  as a result of the  receipt of such
supplemental information.


INFORMATION ABOUT FUND SHARES


    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  (or  funds).  Shares  issued  are fully  paid and
nonassessable and have no pre-emptive, conversion or similar rights.

    Each fund votes  separately  on  matters  affecting  that fund  exclusively.
Voting rights are not cumulative, so that investors holding more than 50% of the
Trust's (i.e.,  all funds')  outstanding  shares may be able to 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 shares of any one fund
voted in favor of a particular nominee or all nominees as a group.


    Each shareholder has rights to dividends and  distributions  declared by the
fund he or she owns 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  fund  have  equal  voting  rights,  although  each  fund  votes
separately on matters affecting that fund 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,


24                                                AMERICAN CENTURY INVESTMENTS



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 is unable to meet its
obligations.


MULTIPLE CLASS STRUCTURE


    The  funds'  Board of  Trustees  has  adopted  a  multiple  class  plan (the
Multiclass  Plan)  pursuant to Rule 18f-3  adopted by the SEC.  Pursuant to such
plan, the funds may issue up to three classes of funds:  an Investor  Class,  an
Institutional Class and an Advisor Class. Not all funds offer all three classes.

    The Investor Class is made available to investors  directly without any load
or  commission,  for a single  unified  management  fee. The  Institutional  and
Advisor  Classes are made  available to  institutional  shareholders  or through
financial  intermediaries  that do not require the same level of shareholder and
administrative  services from the advisor as Investor Class  shareholders.  As a
result,  the advisor is able to charge these classes a lower unified  management
fee. In addition to the management  fee,  however,  the Advisor Class shares are
subject to a Master  Distribution  and  Shareholder  Services Plan. The plan has
been  adopted  by the  funds'  Board of  Trustees  and  initial  shareholder  in
accordance with Rule 12b-1 adopted by the SEC under the Investment Company Act.


RULE 12B-1


    Rule 12b-1 permits an investment company to pay expenses associated with the
distribution  of its shares in accordance  with a plan adopted by the investment
company's Board of Trustees and approved by its  shareholders.  Pursuant to such
rule, the Board of Trustees and initial  shareholder of the funds' Advisor Class
have approved and entered into a Master  Distribution  and Shareholder  Services
Plan (the Plan).

    In adopting  the Plan,  the Board of Trustees  [including a majority who are
not interested  persons of the funds (as defined in the Investment Company Act),
hereafter referred to as the independent  trustees]  determined that there was a
reasonable likelihood that the Plan would benefit the funds and the shareholders
of the  affected  class.  Pursuant to Rule 12b-1,  information  with  respect to
revenues  and  expenses  under the Plan is  presented  to the Board of  Trustees
quarterly for its  consideration in connection with its  deliberations as to the
continuance  of the Plan.  Continuance of the Plan must be approved by the Board
of Trustees  (including a majority of the independent  trustees)  annually.  The
Plan may be amended by a vote of the Board of Trustees  (including a majority of
the independent trustees), except that the Plan may not be amended to materially
increase the amount to be spent for distribution  without  majority  approval of
the shareholders of the affected class. The Plan terminates automatically in the
event of an assignment  and may be  terminated  upon a vote of a majority of the
independent  trustees  or by  vote  of a  majority  of  the  outstanding  voting
securities of the affected class.


    All fees paid under the Plan will be made in  accordance  with Section 26 of
the Rules of Fair Practice of the National  Association  of  Securities  Dealers
(NASD).

MASTER DISTRIBUTION AND SHAREHOLDER SERVICES PLAN


    As described in the  Prospectus,  the funds'  Advisor  Class shares are made
available to participants in employer-sponsored  retirement or savings plans and
to  persons  purchasing  through  financial   intermediaries,   such  as  banks,
broker-dealers  and insurance  companies.  The distributor enters into contracts
with various  banks,  broker-dealers,  insurance  companies and other  financial
intermediaries  with respect to the sale of the funds'  shares and/or the use of
the funds' shares in various  investment  products or in connection with various
financial services.

    Certain  recordkeeping and administrative  services that are provided by the
funds' transfer agent for the Investor Class  shareholders may be performed by a
plan sponsor (or its agents) or by a financial  intermediary for shareholders in
the Advisor Class.  In addition to such services,  the financial  intermediaries
provide various distribution services.

    To enable  the funds'  shares to be made  available  through  such plans and
financial  intermediaries,  and to compensate them for such services, the funds'
investment advisor has reduced its management fee



STATEMENT OF ADDITIONAL INFORMATION                                      25



by 0.25% per annum with  respect to the  Advisor  Class  shares,  and the funds'
Board of Trustees has adopted a Master  Distribution  and  Shareholder  Services
Plan (the  Distribution  Plan).  Pursuant to such Plan, the Advisor Class shares
pay the  distributor  a fee of 0.50%  annually of the  aggregate  average  daily
assets  of the  funds'  Advisor  Class  shares,  0.25%  of  which  is  paid  for
shareholder  services  (as  described  below)  and  0.25%  of  which is paid for
distribution services.

    Payments may be made for a variety of shareholder services,  including,  but
not limited to, (a) receiving, aggregating and processing purchase, exchange and
redemption  requests  from  beneficial  owners  (including  contract  owners  of
insurance  products  that utilize the funds as underlying  investment  media) of
shares  and  placing   purchase,   exchange  and  redemption   orders  with  the
distributor;  (b) providing  shareholders with a service that invests the assets
of their accounts in shares pursuant to specific or pre-authorized instructions;
(c)  processing  dividend  payments  from a fund on behalf of  shareholders  and
assisting  shareholders in changing dividend options,  account  designations and
addresses; (d) providing and maintaining elective services such as check writing
and wire transfer services;  (e) acting as shareholder of record and nominee for
beneficial owners; (f) maintaining account records for shareholders and/or other
beneficial  owners;  (g) issuing  confirmations of  transactions;  (h) providing
subaccounting  with respect to shares  beneficially  owned by customers of third
parties  or  providing  the   information  to  a  fund  as  necessary  for  such
subaccounting,  (i) preparing and forwarding shareholder communications from the
funds (such as proxies,  shareholder  reports,  annual and semiannual  financial
statements and dividend,  distribution  and tax notices) to shareholders  and/or
other  beneficial  owners;  (j)  providing  other  similar   administrative  and
sub-transfer  agency services;  and (k) paying service fees for the provision of
personal, continuing services to investors, as contemplated by the Rules of Fair
Practice  of  the  NASD  (collectively  referred  to as  shareholder  services).
Shareholder  services do not include  those  activities  and  expenses  that are
primarily intended to result in the sale of additional shares of the funds.

    Distribution  services  include any activity  undertaken or expense incurred
that is primarily intended to result in the sale of Advisor Class shares,  which
services  may  include  but  are  not  limited  to,  (a) the  payment  of  sales
commissions,  ongoing  commissions  and  other  payments  to  brokers,  dealers,
financial  institutions  or others who sell  Advisor  Class  shares  pursuant to
selling  agreements;  (b)  compensation to registered  representatives  or other
employees of the distributor who engage in or support distribution of the funds'
Advisor Class shares; (c) compensation to, and expenses  (including overhead and
telephone  expenses)  of the  distributor;  (d) the  printing  of  prospectuses,
statements  of  additional  information  and  reports  for other  than  existing
shareholders; (e) the preparation, printing and distribution of sales literature
and advertising  materials  provided to the funds'  shareholders and prospective
shareholders;  (f)  receiving  and  answering  correspondence  from  prospective
shareholders,  including  distributing  prospectuses,  statements  of additional
information and shareholder  reports;  (g) the providing of facilities to answer
questions  from  prospective  investors  about fund shares;  (h) complying  with
federal and state  securities  laws  pertaining to the sale of fund shares;  (i)
assisting  investors in completing  application forms and selecting dividend and
other  account  options;  (j) the  providing of other  reasonable  assistance in
connection  with  the  distribution  of  fund  shares;  (k) the  organizing  and
conducting  of  sales  seminars  and  payments  in  the  form  of  transactional
compensation  or promotional  incentives;  (l) profit on the foregoing;  (m) the
payment of "service fees" for the provision of personal,  continuing services to
investors,  as  contemplated  by the Rules of Fair Practice of the NASD; and (n)
such other distribution and services activities as the advisor determines may be
paid for by the funds  pursuant to the terms of this Agreement and in accordance
with Rule 12b-1 of the Investment Company Act.


BUYING AND SELLING FUND SHARES


    Information about buying, selling and exchanging fund shares is contained in
Your Guide to American  Century  Services.  The guide is  available to investors
without charge and may be obtained by calling us.



26                                                 AMERICAN CENTURY INVESTMENTS


VALUATION OF A FUND'S 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 p.m.
Central time each day the Exchange is open for business.  The Exchange typically
observes the  following  holidays:  New Year's Day,  Martin Luther King Jr. Day,
Presidents'  Day,  Good  Friday,  Memorial  Day,  Independence  Day,  Labor Day,
Thanksgiving Day and Christmas Day.  Although the funds expect the same holidays
to be observed in the future,  the Exchange  may modify its holiday  schedule at
any time.

    The  advisor  typically  completes  its  trading  on  behalf of each fund in
various  markets before the Exchange closes for the day. 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 FUNDS

    Securities held by the money market funds 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 funds'
yields. 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 money market funds operate pursuant to Investment Company Act Rule 2a-7,
which permits valuation of portfolio  securities on the basis of amortized cost.
As required by the Rule, the Board of Trustees has adopted  procedures  designed
to stabilize, to the extent reasonably possible, a money market fund's price per
share as computed for the purposes of sales and redemptions at $1.00.  While the
day-to-day  operation of the money  market funds has been  delegated to the fund
managers,   the  quality  requirements   established  by  the  procedures  limit
investments  to certain  instruments  that the Board of Trustees has  determined
present  minimal credit risks and that have been rated in one of the two highest
rating  categories  as  determined by a rating agency or, in the case of unrated
securities,  of comparable  quality.  The procedures require review of the money
market funds' portfolio holdings at such intervals as are reasonable in light of
current market conditions to determine whether the money market funds' net asset
values  calculated  by  using  available  market  quotations  deviate  from  the
per-share  value based on amortized  cost.  The  procedures  also  prescribe the
action to be taken if such deviation should occur.


    The Board of Trustees monitors the levels of illiquid securities, however if
the levels are exceeded, they will take action to rectify these levels.

    Actions the Board of Trustees may consider under these circumstances include
(i) selling portfolio securities prior to maturity,  (ii) withholding  dividends
or distributions from capital, (iii) authorizing a one-time dividend adjustment,
(iv)  discounting  share  purchases and  initiating  redemptions in kind, or (v)
valuing portfolio securities at market price for purposes of calculating NAV.

NON-MONEY MARKET FUNDS

    Securities  held by the  non-money  market  funds  normally are priced by an
independent  pricing  service,  provided  that such  prices are  believed by the
advisor to reflect the fair market value of portfolio securities.


    In valuing  securities,  the pricing  services  generally  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 advisor under the
general  supervision  of the Board of  Trustees.  There are a number of  pricing
services available, and the advisor, 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 ask prices provided by broker-dealers.



STATEMENT OF ADDITIONAL INFORMATION                                       27


    Securities  maturing  within 60 days of the valuation  date may be valued at
cost,  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 value using methods  approved by the Board of
Trustees.

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,  a fund will be exempt from federal and state income taxes to
the extent that it distributes  substantially  all of its net investment  income
and net  realized  capital  gains (if any) to  shareholders.  If a fund fails to
qualify  as a  regulated  investment  company,  it will  be  liable  for  taxes,
significantly   reducing  its  distributions  to  shareholders  and  eliminating
shareholders'  ability to treat  distributions  of the funds in the manner  they
were realized by the funds.

    Certain  bonds  purchased  by the funds may be  treated  as bonds  that were
originally issued at a discount. Original issue discount represents interest for
federal  income tax  purposes  and  generally  can be defined as the  difference
between the price at which a security was issued and its stated redemption price
at maturity.  Although no cash is actually received by a fund until the maturity
of the bond,  original issue discount is treated for federal income tax purposes
as income  earned by a fund over the term of the bond,  and therefore is subject
to the distribution requirements of the Code. The annual amount of income earned
on such a bond by a fund  generally  is  determined  on the basis of a  constant
yield to maturity that takes into account the semiannual  compounding of accrued
interest.

    In addition, some of the bonds may be purchased by a fund at a discount that
exceeds the  original  issue  discount on such bonds,  if any.  This  additional
discount  represents  market discount for federal income tax purposes.  The gain
realized on the disposition of any bond having market discount generally will be
treated as taxable  ordinary income to the extent it does not exceed the accrued
market discount on such bond (unless a fund elects to include market discount in
income in tax years to which it is  attributable).  Generally,  market  discount
accrues  on a daily  basis for each day the bond is held by a fund on a straight
line basis over the time  remaining to the bond's  maturity.  In the case of any
debt  security  having a fixed  maturity date of not more than one year from its
date of issue,  the gain realized on  disposition  generally  will be treated as
short-term  capital gain.  In general,  any gain  realized on  disposition  of a
security held less than one year is treated as short-term capital gain.

    Under the Code, any distribution of a fund's net realized  long-term capital
gains  designated  by  the  fund  as a  capital  gain  dividend  is  taxable  to
shareholders as long-term capital gains, regardless of the length of time shares
are held.  If a capital  gain  dividend is paid with  respect to any shares of a
fund sold at a loss after  being  held for six months or less,  the loss will be
treated as a long-term capital loss for tax purposes.


STATE AND LOCAL TAXES

    Distributions also may be subject to state and local taxes, even if all or a
substantial  part  of such  distributions  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 a fund pays  distributions  to its
shareholders.  You should  consult your tax advisor about the tax status of such
distributions in your own state.

    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.  A prospective  investor should consult with his or
her tax  advisors or state or local tax  authorities  to  determine  whether the
funds are suitable investments.


28                                               AMERICAN CENTURY INVESTMENTS


HOW FUND PERFORMANCE INFORMATION IS CALCULATED

    The funds may quote  performance  in various  ways.  Historical  performance
information will be used in advertising and sales literature.

    For the money market funds,  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  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 non-money market funds, yield quotations are based on the investment
income per share earned during a particular 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.

MONEY MARKET FUND YIELDS

(seven-day period ended March 31, 1999)


                                     7-Day Yield          Effective Yield
- --------------------------------------------------------------------------------
Capital Preservation                 4.17%                4.26%
- --------------------------------------------------------------------------------
Government Agency
Money Market                         4.37%                4.47


NON-MONEY MARKET FUND YIELDS

(30-day period ended March 31, 1999)

Fund                                                         30-Day Yield
- --------------------------------------------------------------------------------
Short-Term Treasury                                          4.66%
- --------------------------------------------------------------------------------
Intermediate-Term Treasury                                   4.83%
- --------------------------------------------------------------------------------
Long-Term Treasury                                           5.46%
- --------------------------------------------------------------------------------
Inflation-Adjusted Treasury                                  6.60%
- --------------------------------------------------------------------------------
Short-Term Government                                        5.07%
- --------------------------------------------------------------------------------
GNMA Fund                                                    6.14%



    Total returns quoted in advertising and sales literature reflect all aspects
of a fund's return,  including the effect of  reinvesting  dividends and capital
gains distributions (if any) 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  during 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 return of 7.18%,  which is
the steady annual rate that would equal 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 the funds' 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.



STATEMENT OF ADDITIONAL INFORMATION                                        29



    The  following  tables set forth the  average  annual  total  return for the
various classes of the funds for the periods indicated as of March 31, 1999.

AVERAGE ANNUAL TOTAL RETURNS--INVESTOR CLASS


Fiscal Year Ended March 31, 1999


                          One-        Five-        Ten-         Life of
Fund                      Year        Years        Years        Fund(1)
- ------------------------------------------------------------------------
Capital Preservation      4.72%       4.82%        5.00%        5.30%
- ------------------------------------------------------------------------
Government Agency
Money Market              4.91%       4.95%        N/A          4.97%
- ------------------------------------------------------------------------
Short-Term Treasury       5.60%       5.53%        N/A          4.96%
- ------------------------------------------------------------------------
Intermediate-Term
Treasury                  6.09%       6.59%        7.88%        8.66%
- ------------------------------------------------------------------------
Long-Term Treasury        6.33%       9.03%        N/A          8.30%
- ------------------------------------------------------------------------
Inflation-Adjusted
Treasury                  3.37%       N/A          N/A          2.23%
- ------------------------------------------------------------------------
Short-Term
Government                5.39%       5.50%        6.28%        7.08%
- ------------------------------------------------------------------------
GNMA Fund                 5.66%       7.45%        8.70%        8.60%

(1) The inception dates are: Capital Preservation,  October 13, 1972; Government
Agency  Money  Market,  December  5, 1989;  Short-Term  Treasury  and  Long-Term
Treasury,   September  8,  1992;   Intermediate-Term  Treasury,  May  16,  1980;
Inflation-Adjusted Treasury, February 10, 1997; Short-Term Government,  December
15, 1982; and GNMA, September 23, 1985.

AVERAGE ANNUAL TOTAL RETURNS--ADVISOR CLASS

Fiscal Year Ended March 31, 1999

Fund                                   One-Year       Life of Fund(1)
- -----------------------------------------------------------------------
Government Agency Money Market         N/A            N/A
- -----------------------------------------------------------------------
Short-Term Treasury                    5.34%          5.47%
- -----------------------------------------------------------------------
Intermediate-Term Treasury             5.83%          6.65%
- -----------------------------------------------------------------------
Long-Term Treasury                     6.07%          3.81%
- -----------------------------------------------------------------------
Inflation-Adjusted Treasury            N/A            2.45%
- -----------------------------------------------------------------------
Short-Term Government                  N/A            4.63%
- -----------------------------------------------------------------------
GNMA Fund                              5.40%          5.94%

(1) The inception dates are: Short-Term Treasury, Intermediate-Term Treasury and
GNMA, October 9, 1997; Long-Term Treasury, January 12, 1998;  Inflation-Adjusted
Treasury,  June 15, 1998; and Short-Term  Government,  July 8, 1998.  Government
Agency Money Market had not commenced operations as of the fiscal year end March
31, 1999.


    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 percentages or as dollar amounts 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.


    The funds'  performance may be compared with the performance of other mutual
funds  tracked by mutual  fund rating  services or with other  indices of market
performance.  This may include  comparisons with funds that, unlike the 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 high-yield 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,  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 indices of stock market  performance;  and
indices and historical data supplied by major securities brokerage or investment
advisory



30                                              AMERICAN CENTURY INVESTMENTS



firms.  The funds  also may  utilize  reprints  from  newspapers  and  magazines
furnished by third parties to illustrate  historical  performance  or to provide
general information about the funds.

    From time to time,  the funds  may,  in  addition  to any other  permissible
information,  include the  following  types of  information  in  advertisements,
supplemental  sales literature and reports to  shareholders:  (1) discussions of
general economic or financial principles (such as the effects of compounding and
the benefits of dollar-cost  averaging);  (2)  discussions  of general  economic
trends;  (3)  presentations of statistical data to supplement such  discussions;
(4)  descriptions of past or anticipated  portfolio  holdings for one or more of
the funds;  (5)  descriptions  of investment  strategies  for one or more of the
funds;  (6)  descriptions  or  comparisons  of various  savings  and  investment
products  (including,  but  not  limited  to,  qualified  retirement  plans  and
individual  stocks and  bonds),  which may or may not  include  the  funds;  (7)
comparisons of investment products (including the funds) with relevant market or
industry  indices  or other  appropriate  benchmarks;  (8)  discussions  of fund
rankings or ratings by recognized  rating  organizations;  and (9)  testimonials
describing  the  experience  of persons who have  invested in one or more of the
funds. The funds also may include calculations, such as hypothetical compounding
examples,  which describe  hypothetical  investment  results.  Such  performance
examples will be based on an express set of  assumptions  and are not indicative
of the performance of any of the funds.

    Pursuant to the Multiple Class Plan, the funds may issue additional  classes
of existing  funds or introduce  new funds with multiple  classes  available for
purchase.  To the extent a new class is added to an existing  fund,  the advisor
may, in compliance with SEC and NASD rules,  regulations and guidelines,  market
the new class of shares  using the  historical  performance  information  of the
original class of shares. When quoting performance information for the new class
of shares for  periods  prior to the first full  quarter  after  inception,  the
original class's performance will be restated to reflect the expenses of the new
class.  For  periods  after the  first  full  quarter  after  inception,  actual
performance of the new class will be used.


FINANCIAL STATEMENTS


    The financial  statements of the funds are included in the Annual Reports to
shareholders  for the fiscal year ended March 31, 1999.  The Annual  Reports are
incorporated herein by reference.  You may receive copies of the reports without
charge upon  request to American  Century at the address and  telephone  numbers
shown on the back cover of the Statement of Additional Information.



STATEMENT OF ADDITIONAL INFORMATION                                       31


MORE  INFORMATION  ABOUT  THE  FUNDS  IS  CONTAINED  IN THE  FUNDS'  ANNUAL  AND
SEMIANNUAL REPORTS.

Annual and Semiannual Reports


     These contain more information about the funds'  investments and the market
conditions  and investment  strategies  that  significantly  affected the funds'
performance  during the most recent  fiscal  period.  The annual and  semiannual
reports are  incorporated  by reference into this SAI. This means that these are
legally part of this SAI.

     You can receive  free copies of the annual and  semiannual  reports and ask
any questions about the funds and your accounts by contacting  American  Century
at the address or one of the telephone numbers listed below.


If you own or are considering purchasing fund shares through

* an employer-sponsored retirement plan
* a bank
* a broker-dealer
* an insurance company
* another financial intermediary

you can receive the annual and semiannual reports directly from them.


You also can get  information  about the funds from the  Securities and Exchange
Commission (SEC).


* In person                        SEC Public
                                   Reference Room
                                   Washington, D.C.
                                   Call 1-800-SEC-0330 for
                                   location and hours.

* On the Internet                  www.sec.gov

* By mail                          SEC Public
                                   Reference Section
                                   Washington, D.C.
                                   20549-6009
                                   (The SEC will charge a
                                   fee for copying the
                                   documents.)


Investment Company Act File No. 811-4363

- --------------------------------------------------------------------------------
[american century logo (reg.sm)]
American
Century

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

INVESTOR RELATIONS
1-800-345-2021 or 816-531-5575

AUTOMATED INFORMATION LINE
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EMPLOYER-SPONSORED RETIREMENT PLANS
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SH-SAI-16707  9908
<PAGE>
AMERICAN CENTURY GOVERNMENT INCOME TRUST


PART C    OTHER INFORMATION

Item 23   Exhibits (all  exhibits  not  filed  herewith  are being  incorporated
          herein by reference).

          (a)  Amended and Restated  Agreement  and  Declaration  of Trust dated
               March 9, 1998 and amended March 1, 1999 (filed  electronically as
               Exhibit a to Post-Effective  Amendment No. 37 to the Registration
               Statement on Form N-1A, filed May 7, 1999, File No. 2-99222).

          (b)  Amended  and  Restated   Bylaws,   dated  March  9,  1998  (filed
               electronically as Exhibit 2b to  Post-Effective  Amendment No. 23
               to the  Registration  Statement on Form N-1A of American  Century
               Municipal Trust, filed March 26, 1998, File No. 2-91229).

          (c)  Registrant hereby incorporates by reference,  as though set forth
               fully herein,  Article III, Article IV, Article V, Article VI and
               Article VIII of Registrant's  Amended and Restated  Agreement and
               Declaration   of  Trust,   appearing   as  Exhibit  (a)  to  this
               Post-Effective  Amendment No. 37 to the Registration Statement on
               Form N-1A of the Registrant; and Article II, Article III, Article
               IV and Article V of  Registrant's  Amended and  Restated  Bylaws,
               appearing as Exhibit (b) to  Post-Effective  Amendment  No. 23 to
               the  Registration  Statement  on Form  N-1A of  American  Century
               Municipal Trust on March 26, 1998.

          (d)  (1) Investor Class Management  Agreement between American Century
               Government   Income   Trust  and  American   Century   Investment
               Management,  Inc. dated August 1, 1997 (filed  electronically  as
               Exhibit 5 to Post-Effective  Amendment No. 33 to the Registration
               Statement on Form N-1A, filed July 31, 1997, File No. 2-99222).

               (2) Amendment No. 1 to the Investor  Class  Management  Agreement
               between  American  Century  Government  Income Trust and American
               Century Investment  Management,  Inc. dated March 31, 1998 (filed
               electronically as Exhibit 5b to  Post-Effective  Amendment No. 23
               on Form  N-1A of  American  Century  Municipal  Trust,  File  No.
               2-91229).

               (3) Amendment No. 2 to the Investor  Class  Management  Agreement
               between  American  Century  Government  Income Trust and American
               Century Investment Management, Inc. is included herein.

               (4)  Advisor  Class  Investment   Management   Agreement  between
               American  Century  Government  Income Trust and American  Century
               Investment Management,  Inc., dated August 1, 1997 and amended as
               of  June  1,  1998  (filed   electronically   as  Exhibit  5b  to
               Post-Effective  Amendment No. 9 to the Registration  Statement on
               Form N-1A of American Century  Investment  Trust,  filed June 30,
               1999, File No. 33-65170).

          (e)  (1) Distribution  Agreement  between American Century  Government
               Income Trust and Funds Distributor,  Inc., dated January 15, 1998
               (filed  electronically as Exhibit 6 to  Post-Effective  Amendment
               No. 28 to the  Registration  Statement  on Form N-1A of  American
               Century Target Maturities Trust, filed January 30, 1998, File No.
               2-94608).

               (2) Amendment No. 1 to Distribution  Agreement  between  American
               Century  Government  Income  Trust and Funds  Distributor,  Inc.,
               dated  June 1,  1998  (filed  electronically  as  Exhibit  B6b to
               Post-Effective  Amendment No. 23 to the Registration Statement on
               Form N-1A of American Century  Quantitative  Equity Funds on June
               29, 1998, File No. 33-19589).

               (3) Amendment No. 2 to Distribution  Agreement  between  American
               Century  Government  Income  Trust and Funds  Distributor,  Inc.,
               dated  December 1, 1998 (filed  electronically  as Exhibit B6c to
               Post-Effective  Amendment No. 12 to the Registration Statement on
               Form  N-1A of  American  Century  World  Mutual  Funds,  Inc.  on
               November 13, 1998, File No. 33-39242).

               (4) Amendment No. 3 to Distribution  Agreement  between  American
               Century  Government  Income  Trust and Funds  Distributor,  Inc.,
               dated  January 29, 1999  (filed  electronically  as Exhibit e4 to
               Post-Effective  Amendment No. 24 to the Registration Statement on
               Form  N-1A of  American  Century  Variable  Portfolios,  Inc.  on
               January 15, 1999, File No. 33-14567).

          (f)  Not applicable.

          (g)  (1)  Master  Agreement  by and  between  Commerce  Bank N.A.  and
               Twentieth  Century  Services,  Inc. dated January 22, 1997 (filed
               electronically as Exhibit g2 to  Post-Effective  Amendment No. 76
               on Form N-1A of American  Century  Mutual Funds,  Inc.,  File No.
               2-14213).

               (2) Global Custody Agreement between American Century  Government
               Income Trust and The Chase Manhattan  Bank,  dated August 9, 1996
               (filed  electronically as Exhibit 8 to  Post-Effective  Amendment
               No.  31 to the  Registration  Statement  on Form  N-1A  filed  on
               February 7, 1997, File No. 2-99222).

          (h)  (1)  Amendment  dated  March  9,  1998  to  the  Transfer  Agency
               Agreement  between American Century  Government  Income Trust and
               American  Century  Services  Corporation,  dated  August  1, 1997
               (filed  electronically as Exhibit 9b to Post-Effective  Amendment
               No. 23 of American  Century  Municipal  Trust on March 26,  1998,
               File No. 2-91229).

               (2) Credit Agreement between American Century Funds and The Chase
               Manhattan Bank, as Administrative  Agent dated as of December 18,
               1998  (filed  electronically  as  Exhibit  h2  to  Post-Effective
               Amendment  No. 37 to the  Registration  Statement  on Form  N-1A,
               filed May 7, 1999, File No. 2-99222).

          (i)  Opinion and Consent of counsel (filed electronically as Exhibit i
               to Post-Effective  Amendment No. 37 to the Registration Statement
               on Form N-1A, filed May 7, 1999, File No. 2-99222).

          (j)  (1)   Consent   of   PricewaterhouseCoopers    LLP,   independent
               accountants is included herein.

               (2)  Consent  of KPMG Peat  Marwick,  LLP,  independent  auditors
               (filed  electronically as Exhibit 11 to Post-Effective  Amendment
               No. 33 to the Registration  Statement on Form N-1A of Registrant,
               filed July 31, 1997, File No. 2-99222).

               (3)  Power  of   Attorney   dated   December   18,   1998  (filed
               electronically as Exhibit j3 to  Post-Effective  Amendment No. 37
               to the  Registration  Statement on Form N-1A,  filed May 7, 1999,
               File No. 2-99222).

          (k)  Not applicable.

          (l)  Not applicable.

          (m)  (1) Master Distribution and Shareholder Services Plan of American
               Century Government Income Trust,  American Century  International
               Bond Fund,  American Century Target Maturities Trust and American
               Century Quantitative Equity Funds (Advisor Class) dated August 1,
               1997  (filed  electronically  as  Exhibit  15  of  Post-Effective
               Amendment No. 27 to the  Registration  Statement on Form N-1A for
               American Century Target Maturities Trust,  filed August 29, 1997,
               File No. 2-94608).

               (2)  Amendment  No.  1 to  Master  Distribution  and  Shareholder
               Services  Plan  of  American  Century   Government  Income  Trust
               (Advisor  Class)  dated June 29,  1998 (filed  electronically  as
               Exhibit   15b  to   Post-Effective   Amendment   No.  23  of  the
               Registration   Statement   on  Form  N-1A  of  American   Century
               Quantitative  Equity  Funds  filed  on June  29,  1998,  File No.
               33-19589).

          (n)  (1)  Financial  Data  Schedule  GNMA  Fund,  Investor  Class,  is
               included herein.

               (2) Financial Data Schedule GNMA Fund, Advisor Class, is included
               herein.

               (3) Financial Data Schedule for Intermediate-Term  Treasury Fund,
               Investor Class, is included herein.

               (4) Financial Data Schedule for Intermediate-Term  Treasury Fund,
               Advisor Class, is included herein.

               (5) Financial  Data Schedule for  Government  Agency Money Market
               Fund, Investor Class, is included herein.

               (6)  Financial  Data  Schedule for  Short-Term  Government  Fund,
               Investor Class, is included herein.

               (7)  Financial  Data  Schedule for  Short-Term  Government  Fund,
               Advisor Class, is included herein.

               (8)  Financial  Data  Schedule  for  Short-Term   Treasury  Fund,
               Investor Class, is included herein.

               (9) Financial Data Schedule for Short-Term Treasury Fund, Advisor
               Class, is included herein.

               (10)  Financial  Data  Schedule  for  Long-Term   Treasury  Fund,
               Investor Class, is included herein.

               (11) Financial Data Schedule for Long-Term Treasury Fund, Advisor
               Class, is included herein.

               (12)  Financial  Data  Schedule for  Inflation-Adjusted  Treasury
               Fund, Investor Class, is included herein.

               (13)  Financial  Data  Schedule for  Inflation-Adjusted  Treasury
               Fund, Advisor Class, is included herein.

               (14)  Financial  Data  Schedule  for Capital  Preservation  Fund,
               Investor Class, is included herein.

          (o)  (1) Multiple Class Plan of American Century  California  Tax-Free
               and Municipal Funds,  American Century  Government  Income Trust,
               American  Century  International  Bond  Funds,  American  Century
               Investment  Trust,  American Century  Municipal  Trust,  American
               Century Target Maturities Trust and American Century Quantitative
               Equity  Funds  dated  August 1,  1997  (filed  electronically  as
               Exhibit 15 to Post-Effective Amendment No. 27 to the Registration
               Statement  on Form N-1A of  American  Century  Target  Maturities
               Trust, filed August 29, 1997, File No. 2-94608).

               (2)  Amendment  to  Multiple  Class  Plan  of  American   Century
               California   Tax-Free  and  Municipal  Funds,   American  Century
               Government  Income Trust,  American  Century  International  Bond
               Funds,   American  Century  Investment  Trust,  American  Century
               Municipal  Trust,  American  Century Target  Maturities Trust and
               American Century  Quantitative  Equity Funds dated August 1, 1997
               (filed  electronically as Exhibit o2 to Post-Effective  Amendment
               No. 23 to the  Registration  Statement  on Form N-1A of  American
               Century  Quantitative Equity Funds, filed June 29, 1998, File No.
               33-19589).


Item 24. Persons Controlled by or Under Common Control with Registrant.

Not applicable.


Item 25. 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 Amended and Restated Bylaws, dated March 9, 1998,
appearing as Exhibit 2b to  Post-Effective  Amendment No. 23 to the Registration
Statement on Form N-1A of American Century Municipal Trust filed March 26, 1998.

The  Registrant  has  purchased  an insurance  policy  insuring its officers and
directors  against  certain  liabilities  which such  officers and directors may
incur  while  acting  in such  capacities  and  providing  reimbursement  to the
Registrant for sums which it may be permitted or required to pay to its officers
and directors by way of  indemnification  against such  liabilities,  subject in
either case to clauses respecting deductibility and participation.


Item 26. Business and Other Connections of Investment Advisor.

None.


Item 27. Principal Underwriters.

     (a)  Funds  Distributor,   Inc.  (the   "Distributor")  acts  as  principal
underwriter for the following investment companies.

American Century California Tax-Free and Municipal Funds
American Century Capital Portfolios, Inc.
American Century Government Income Trust
American Century International Bond Funds
American Century Investment Trust
American Century Municipal Trust
American Century Mutual Funds, Inc.
American Century Premium Reserves, Inc.
American Century Quantitative Equity Funds
American Century Strategic Asset Allocations, Inc.
American Century Target Maturities Trust
American Century Variable Portfolios, Inc.
American Century World Mutual Funds, Inc.
The Brinson Funds
Dresdner RCM Capital Funds, Inc.
Dresdner RCM Equity Funds, Inc.
J.P. Morgan Institutional Funds
J.P. Morgan Funds
JPM Series Trust
JPM Series Trust II
LaSalle Partners Funds, Inc.
Kobrick Investment Trust
Merrimac Series
Monetta Fund, Inc.
Monetta Trust
The Montgomery Funds I
The Montgomery Funds II
The Munder Framlington Funds Trust
The Munder Funds Trust
The Munder Funds, Inc.
National Investors Cash Management Fund, Inc.
Orbitex Group of Funds
SG Cowen Funds, Inc.
SG Cowen Income + Growth Fund, Inc.
SG Cowen Standby Reserve Fund, Inc.
SG Cowen Standby Tax-Exempt Reserve Fund, Inc.
SG Cowen Series Funds, Inc.
St. Clair Funds, Inc.
The Skyline Funds
Waterhouse Investors Family of Funds, Inc.
WEBS Index Fund, Inc.

     The Distributor is registered  with the Securities and Exchange  Commission
as a  broker-dealer  and is a member of the National  Association  of Securities
Dealers.  The  Distributor  is located at 60 State Street,  Suite 1300,  Boston,
Massachusetts 02109. The Distributor is an indirect  wholly-owned  subsidiary of
Boston  Institutional  Group,  Inc., a holding company all of whose  outstanding
shares are owned by key employees.

     (b)  The  following  is a list of the  executive  officers,  directors  and
partners of the Distributor:

<TABLE>
Name and Principal Business Address*  Positions and Offices with          Positions and Offices with
                                      Underwriter                         Registrant

<S>                                   <C>                                 <C>
Marie E. Connolly                     Director, President and Chief       none
                                      Executive Officer

George A. Rio                         Executive Vice President            President, Principal Executive
                                                                          and Principal Financial Officer

Donald R. Roberson                    Executive Vice President            none

William S. Nichols                    Executive Vice President            none

Margaret W. Chambers                  Senior Vice President,              none
                                      General Counsel, Chief
                                      Compliance Officer,
                                      Secretary and Clerk
Joseph F. Tower, III                  Director, Senior Vice President,    none
                                      Treasurer and Chief Financial
                                      Officer

Paula R. David                        Senior Vice President               none

Gary S. MacDonald                     Senior Vice President               none

Judith K. Benson                      Senior Vice President               none

William J. Nutt                       Chairman and Director               none
- --------------------
* All addresses are 60 State Street, Suite 1300, Boston, Massachusetts 02109
</TABLE>

     (c) Not applicable.


Item 28. Location of Accounts and Records.

All  accounts,  books and other  documents  required to be maintained by Section
31(a)  of the  1940  Act,  and  the  rules  promulgated  thereunder,  are in the
possession of the Registrant, American Century Services Corporation and American
Century Investment Management, Inc., all located at American Century Tower, 4500
Main Street, Kansas City, Missouri 64111.


Item 29. Management Services.

Not applicable.

Item 30. Undertakings.

Not applicable.
<PAGE>
                                   SIGNATURES

     Pursuant  to  the  requirements  of the  Securities  Act of  1933  and  the
Investment Company Act of 1940, the Registrant certifies that it has duly caused
this  Post-Effective  Amendment  No.  39/Amendment  No.  40 to its  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized,  in the City of Kansas  City,  State of  Missouri on the 28th day of
July, 1999.

                            AMERICAN CENTURY GOVERNMENT INCOME TRUST

                            By: /*/George A. Rio
                                George A. Rio
                                President and Principal Executive Officer


     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Post-Effective  Amendment No. 39 has been signed below by the following  persons
in the capacities and on the dates indicated.

<TABLE>
<CAPTION>
                                                                      Date
<S>                                  <C>                           <C>
*George A. Rio                       President, Principal          July 28, 1999
- ---------------------------------    Executive and Principal
George A. Rio                        Financial Officer

*Maryanne Roepke                     Vice President, Treasurer     July 28, 1999
- ---------------------------------    and Principal Accounting
Maryanne Roepke                      Officer

*Albert A. Eisenstat                 Director                      July 28, 1999
- ---------------------------------
Albert A. Eisenstat

*Ronald J. Gilson                    Director                      July 28, 1999
- ---------------------------------
Ronald J. Gilson

*William M. Lyons                    Director                      July 28, 1999
- ---------------------------------
William M. Lyons

*Myron S. Scholes                    Director                      July 28, 1999
- ---------------------------------
Myron S. Scholes

*Kenneth E. Scott                    Director                      July 28, 1999
- ---------------------------------
Kenneth E. Scott

*Isaac Stein                         Director                      July 28, 1999
- ---------------------------------
Isaac Stein

*James E. Stowers III                Director                      July 28, 1999
- ---------------------------------
James E. Stowers III

*Jeanne D. Wohlers                   Director                      July 28, 1999
- ---------------------------------
Jeanne D. Wohlers
</TABLE>
/s/Charles C.S. Park
*by Charles C.S. Park,  Attorney in Fact
(pursuant to a Power of Attorney dated December 18, 1998).

EXHIBIT     DESCRIPTION

EX-99.a     Amended and Restated  Agreement and Declaration of Trust dated March
            9,  1998  and  amended   March  1,  1999  (filed  as  Exhibit  a  to
            Post-Effective  Amendment  No. 37 to the  Registration  Statement on
            Form N-1A of the Registrant, File No. 2-99222, filed May 7, 1999 and
            incorporated herein by reference).

EX-99.b     Amended and Restated  Bylaws,  dated March 9, 1998 (filed as Exhibit
            2b of Post-Effective  Amendment No. 23 to the Registration Statement
            on Form N-1A of American Century  Municipal Trust, File No. 2-91229,
            filed March 26, 1998 and incorporated herein by reference).

EX-99.d1    Investor  Class  Management   Agreement   between  American  Century
            Government Income Trust and American Century Investment  Management,
            Inc.  dated  August 1, 1997  (filed as  Exhibit 5 of  Post-Effective
            Amendment  No.  33 to the  Registration  Statement  on Form  N-1A of
            Registrant,  File No. 2-99222,  filed July 31, 1997 and incorporated
            herein by reference).

EX-99.d2    Amendment No. 1 to the Investor Class Management  Agreement  between
            American  Century  Government  Income  Trust  and  American  Century
            Investment  Management,  Inc. dated March 31, 1998 (filed as Exhibit
            5b of Post-Effective  Amendment No. 23 of the Registration Statement
            on Form N-1A of American Century  Municipal Trust, File No. 2-91229,
            filed March 26, 1998 and incorporated herein by reference).

EX-99.d3    Amendment No. 2 to the Investor Class Management  Agreement  between
            American  Century  Government  Income  Trust  and  American  Century
            Investment Management, Inc. dated July 1, 1998 is included herein.

EX-99.d4    Advisor  Class  Investment  Management  Agreement  between  American
            Century  Government  Income  Trust and American  Century  Investment
            Management,  Inc.,  dated  August 1, 1997 and  amended as of June 1,
            1998 (filed as Exhibit 5b of  Post-Effective  Amendment No. 9 to the
            Registration  Statement on Form N-1A of American Century  Investment
            Trust,  File No.  33-65170,  filed  June 30,  1999 and  incorporated
            herein by reference).

EX-99.e1    Distribution  Agreement  between American Century  Government Income
            Trust and Funds Distributor,  Inc., dated January 15, 1998 (filed as
            Exhibit 6 of  Post-Effective  Amendment  No. 28 to the  Registration
            Statement on Form N-1A of American Century Target  Maturities Trust,
            File No. 2-94608 filed January 30, 1998 and  incorporated  herein by
            reference).

EX-99.e2    Amendment No. 1 to Distribution  Agreement  between American Century
            Government Income Trust and Funds  Distributor,  Inc., dated June 1,
            1998 (filed as Exhibit B6b to of Post-Effective  Amendment No. 23 to
            the  Registration   Statement  on  Form  N-1A  of  American  Century
            Quantitative  Equity  Funds,  File No.  33-19589,  filed on June 29,
            1998, and incorporated herein by reference).

EX-99.e3    Amendment No. 2 to Distribution  Agreement  between American Century
            Government Income Trust and Funds Distributor,  Inc., dated December
            1, 1998 (filed as Exhibit B6c to Post-Effective  Amendment No. 12 to
            the  Registration  Statement on Form N-1A of American  Century World
            Mutual Funds,  Inc., File No. 33-39242,  filed on November 13, 1998,
            and incorporated herein by reference).

EX-99.e4    Amendment No. 3 to Distribution  Agreement  between American Century
            Government Income Trust and Funds  Distributor,  Inc., dated January
            29, 1999 (filed as Exhibit e4 to Post-Effective  Amendment No. 24 to
            the Registration Statement on Form N-1A of American Century Variable
            Portfolios,  Inc., File No. 33-14567, filed on January 15, 1999, and
            incorporated herein by reference).

EX-99.g1    Master  Agreement by and between  Commerce  Bank N.A. and  Twentieth
            Century  Services,  Inc. dated January 22, 1997 (filed as Exhibit g2
            to Post-Effective  Amendment No. 76 on Form N-1A of American Century
            Mutual Funds,  Inc., File No.  2-14213,  filed on February 28, 1997,
            and incorporated herein by reference).

EX-99.g2    Global Custody Agreement between American Century  Government Income
            Trust and The Chase Manhattan  Bank,  dated August 9, 1996 (filed as
            Exhibit 8 to  Post-Effective  Amendment  No. 31 to the  Registration
            Statement on Form N-1A of the Registrant, File No. 2-99222, filed on
            February 7, 1997, and incorporated herein by reference).

EX-99.h1    Amendment  dated  March 9,  1998 to the  Transfer  Agency  Agreement
            between  American  Century  Government  Income  Trust  and  American
            Century Services Corporation, dated August 1, 1997 (filed as Exhibit
            9b to Post-Effective  Amendment No. 23 to the Registration Statement
            on Form N-1A of American Century  Municipal Trust, File No. 2-91229,
            filed March 26, 1998, and incorporated herein by reference).

EX-99.h2    Credit  Agreement  between  American  Century  Funds  and The  Chase
            Manhattan  Bank,  as  administrative  Agent dated as of December 18,
            1998 (filed as Exhibit h2 to Post-Effective  Amendment No. 37 to the
            Registration  Statement on Form N-1A of Registrant File No. 2-99222,
            filed May 7, 1999, and incorporated herein by reference).

EX-99.i     Opinion and consent of Counsel (filed as Exhibit i to Post-Effective
            Amendment  No.  37 to the  Registration  Statement  on Form  N-1A of
            Registrant  File No.  2-99222,  filed May 7, 1999, and  incorporated
            herein by reference).

EX-99.j1    Consent  of  PricewaterhouseCoopers  LLP,  independent  accountants,
            included herein.

EX-99.j2    Consent of KPMG Peat Marwick, independent auditors (filed as Exhibit
            11 to Post-Effective  Amendment No. 33 to the Registration Statement
            on Form N-1A of the  Registrant,  File No.  2-99222,  filed July 31,
            1997 and incorporated herein by reference).

EX-99.j3    Power of Attorney  dated  December  18, 1998 (filed as Exhibit j3 to
            Post-Effective  Amendment  No. 37 to the  Registration  Statement on
            Form N-1A of Registrant  File No.  2-99222,  filed May 7, 1999,  and
            incorporated herein by reference).

EX-99.m1    Master  Distribution  and  Shareholder  Services  Plan  of  American
            Century Government Income Trust, American Century International Bond
            Fund,  American Century Target Maturities Trust and American Century
            Quantitative  Equity  Funds  (Advisor  Class)  dated  August 1, 1997
            (filed  as  Exhibit  15 to  Post-Effective  Amendment  No. 27 to the
            Registration  Statement  on Form N-1A for  American  Century  Target
            Maturities  Trust,  File No.  2-94608,  filed  August  29,  1997 and
            incorporated herein by reference).

EX-99.m2    Amendment No. 1 to Master Distribution and Shareholder Services Plan
            of American  Century  Government  Income Trust (Advisor Class) dated
            June 29, 1998 (filed as Exhibit 15b to Post-Effective  Amendment No.
            23 of the  Registration  Statement on Form N-1A of American  Century
            Quantitative Equity Funds, File No. 33-19589, filed on June 29, 1998
            and incorporated herein by reference).

EX-99.o1    Multiple  Class Plan of American  Century  California  Tax-Free  and
            Municipal Funds,  American Century Government Income Trust, American
            Century International Bond Funds, American Century Investment Trust,
            American Century Municipal Trust, American Century Target Maturities
            Trust and American Century Quantitative Equity Funds dated August 1,
            1997 (filed as Exhibit 15 to Post-Effective  Amendment No. 27 to the
            Registration  Statement  on Form N-1A for  American  Century  Target
            Maturities  Trust,  File No.  2-94608,  filed  August  29,  1997 and
            incorporated herein by reference).

EX-99.o2    Amendment  to  Multiple  Class Plan of American  Century  California
            Tax-Free and Municipal  Funds,  American Century  Government  Income
            Trust,  American Century  International Bond Funds, American Century
            Investment Trust, American Century Municipal Trust, American Century
            Target  Maturities  Trust and American Century  Quantitative  Equity
            Funds dated  August 1, 1997  (filed as an Exhibit to  Post-Effective
            Amendment  No.  23 to the  Registration  Statement  on Form  N-1A of
            American Century  Quantitative  Equity Funds, File No. 33-19589,  on
            June 29, 1998 and incorporated herein by reference).

EX-27.5.1a  Financial Data Schedule for GNMA Fund - Investor Class.

EX-27.5.1b  Financial Data Schedule for GNMA Fund - Advisor Class.

EX-27.5.2a  Financial  Data  Schedule  for  Intermediate-Term  Treasury  Fund  -
            Investor Class.

EX-27.5.2b  Financial  Data  Schedule  for  Intermediate-Term  Treasury  Fund  -
            Advisor Class.

EX-27.4.3   Financial  Data Schedule for  Government  Agency Money Market Fund -
            Investor Class.

EX-27.5.4a  Financial  Data Schedule for Short-Term  Government  Fund - Investor
            Class.

EX-27.5.4b  Financial  Data Schedule for  Short-Term  Government  Fund - Advisor
            Class.

EX-27.5.5a  Financial  Data  Schedule for  Short-Term  Treasury  Fund - Investor
            Class.

EX-27.5.5b  Financial  Data  Schedule  for  Short-Term  Treasury  Fund - Advisor
            Class.

EX-27.5.6a  Financial  Data  Schedule  for  Long-Term  Treasury  Fund - Investor
            Class.

EX-27.5.6b  Financial Data Schedule for Long-Term Treasury Fund - Advisor Class.

EX-27.5.7a  Financial  Data  Schedule  for  Inflation-Adjusted  Treasury  Fund -
            Investor Class.

EX-27.5.7b  Financial  Data  Schedule  for  Inflation-Adjusted  Treasury  Fund -
            Advisor Class.

EX-27.4.8   Financial  Data  Schedule for Capital  Preservation  Fund - Investor
            Class.

                                    Exhibit A

<TABLE>
         Registered Investment Companies Subject to Management Agreement
- --------------------------------------------------------------------------------- ----------------------------------

Registered Investment Company and Funds                                                         Date
- --------------------------------------------------------------------------------- ----------------------------------

<S>                                                                                    <C>
American Century California Tax-Free and Municipal Funds
     Benham California High Yield Municipal Fund                                           August 1, 1997
     Benham California Insured Tax-Free Fund                                               August 1, 1997
     Benham California Intermediate-Term Tax-Free Fund                                     August 1, 1997
     Benham California Limited-Term Tax-Free Fund                                          August 1, 1997
     Benham California Long-Term Tax-Free Fund                                             August 1, 1997
     Benham California Municipal Money Market Fund                                         August 1, 1997
     Benham California Tax-Free Money Market Fund                                          August 1, 1997

American Century Government Income Trust
     Benham Capital Preservation Fund                                                      August 1, 1997
     Benham GNMA Fund                                                                      August 1, 1997
     Benham Government Agency Money Market Fund                                            August 1, 1997
     Benham Inflation-Adjusted Treasury Fund                                               August 1, 1997
     Benham Intermediate-Term Treasury Fund                                                August 1, 1997
     Benham Long-Term Treasury Fund                                                        August 1, 1997
     Benham Short-Term Government Fund                                                     August 1, 1997
     Benham Short-Term Treasury Fund                                                       August 1, 1997

American Century International Bond Funds
     Benham International Bond Fund                                                        August 1, 1997

American Century Investment Trust
     Benham Prime Money Market Fund                                                        August 1, 1997

American Century Municipal Trust
     Benham Arizona Intermediate-Term Municipal Fund                                       August 1, 1997
     Benham Florida Intermediate-Term Municipal Fund                                       August 1, 1997
     Benham Florida Municipal Money Market Fund                                            August 1, 1997
     Benham Intermediate-Term Tax-Free Fund                                                August 1, 1997
     Benham Limited-Term Tax-Free Fund                                                     August 1, 1997
     Benham Long-Term Tax-Free Fund                                                        August 1, 1997
     Benham High-Yield Municipal Fund                                                      March 31, 1998
     Benham Tax-Free Money Market Fund                                                     August 1, 1997

American Century Quantitative Equity Funds
     American Century Equity Growth Fund                                                   August 1, 1997
     American Century Global Gold Fund                                                     August 1, 1997
     American Century Global Natural Resources Fund                                        August 1, 1997
     American Century Income & Growth Fund                                                 August 1, 1997
     American Century Small Capitalization Quantitative Fund                               July 1, 1998
     American Century Utilities Fund                                                       August 1, 1997

American Century Target Maturities Trust
     Benham Target Maturities Trust: 2000                                                  August 1, 1997
     Benham Target Maturities Trust: 2005                                                  August 1, 1997
     Benham Target Maturities Trust: 2010                                                  August 1, 1997
     Benham Target Maturities Trust: 2015                                                  August 1, 1997
     Benham Target Maturities Trust: 2020                                                  August 1, 1997
     Benham Target Maturities Trust: 2025                                                  August 1, 1997
- --------------------------------------------------------------------------------- ----------------------------------
</TABLE>


By executing  this Exhibit A, each Fund  executes  the  Management  Agreement to
which it is  attached  and all of its  Exhibits  and  amendments  as of the date
specified above.

                                        AMERICAN CENTURY CALIFORNIA TAX-FREE AND
                                             MUNICIPAL FUNDS
                                        AMERICAN CENTURY GOVERNMENT INCOME TRUST
                                        AMERICAN CENTURY INTERNATIONAL BOND
                                             FUNDS
                                        AMERICAN CENTURY INVESTMENT TRUST
                                        AMERICAN CENTURY MUNICIPAL TRUST
                                        AMERICAN CENTURY QUANTITATIVE EQUITY
                                             FUNDS
                                        AMERICAN CENTURY TARGET MATURITIES TRUST
AMERICAN CENTURY INVESTMENT
     MANAGEMENT, INC.

/*/Robert C. Puff                       /*/Douglas A. Paul
Robert C. Puff                          Douglas A. Paul
President                               Secretary
<PAGE>
                                    Exhibit B

<TABLE>
                          Series Investment Categories
- ------------------------------------------ --------------------------------------------------------------------------

Investment Category                        Series
- ------------------------------------------ --------------------------------------------------------------------------
<S>                                        <C>
Money Market Funds                         Benham California Municipal Money Market Fund
                                           Benham California Tax-Free Money Market Fund
                                           Benham Capital Preservation Fund
                                           Benham Florida Municipal Money Market Fund
                                           Benham Government Agency Money Market Fund
                                           Benham Prime Money Market Fund
                                           Benham Tax-Free Money Market Fund

Bond Funds                                 Benham Arizona Intermediate-Term Municipal Fund
                                           Benham California High Yield Municipal Fund
                                           Benham California Insured Tax-Free Fund
                                           Benham California Intermediate-Term Tax-Free Fund
                                           Benham California Limited-Term Tax-Free Fund
                                           Benham California Long-Term Tax-Free Fund
                                           Benham Florida Intermediate-Term Municipal Fund
                                           Benham GNMA Fund
                                           Benham High-Yield Municipal Fund
                                           Benham Inflation-Adjusted Treasury Fund
                                           Benham Intermediate-Term Tax-Free Fund
                                           Benham Intermediate-Term Treasury Fund
                                           Benham International Bond Fund
                                           Benham Limited-Term Tax-Free Fund
                                           Benham Long-Term Tax-Free Fund
                                           Benham Long-Term Treasury Fund
                                           Benham Short-Term Government Fund
                                           Benham Short-Term Treasury Fund
                                           Benham Target Maturities Trust: 2000
                                           Benham Target Maturities Trust: 2005
                                           Benham Target Maturities Trust: 2010
                                           Benham Target Maturities Trust: 2015
                                           Benham Target Maturities Trust: 2020
                                           Benham Target Maturities Trust: 2025

Equity Funds                               American Century Equity Growth Fund
                                           American Century Global Gold Fund
                                           American Century Global Natural Resources Fund
                                           American Century Income & Growth Fund
                                           American Century Small Capitalization Quantitative Fund
                                           American Century Utilities Fund
- ------------------------------------------ --------------------------------------------------------------------------
</TABLE>

Dated:  July 1, 1998


                                        AMERICAN CENTURY CALIFORNIA TAX-FREE AND
                                             MUNICIPAL FUNDS
                                        AMERICAN CENTURY GOVERNMENT INCOME TRUST
                                        AMERICAN CENTURY INTERNATIONAL BOND
                                             FUNDS
                                        AMERICAN CENTURY INVESTMENT TRUST
                                        AMERICAN CENTURY MUNICIPAL TRUST
                                        AMERICAN CENTURY QUANTITATIVE EQUITY
                                             FUNDS
                                        AMERICAN CENTURY TARGET MATURITIES TRUST

AMERICAN CENTURY INVESTMENT
MANAGEMENT, INC.

As executed on behalf of the above in   As executed on behalf of the above in
Exhibit A by                            Exhibit A by

Robert C. Puff                          Douglas A. Paul
President                               Secretary
<PAGE>
                                    Exhibit C

              Investment Category Fee Schedules: Money Market Funds

<TABLE>
Schedule 1
                                                    ------------------------------------------------------------------
<S>                               <C>               <C>
Category Assets                    Fee Rate                                 Schedule 1 Funds:
First $1 billion                   0.2500%                          Benham Capital Preservation Fund
Next $1 billion                    0.2070%                     Benham Government Agency Money Market Fund
                                                    ------------------------------------------------------------------
Next $3 billion                    0.1660%
Next $5 billion                    0.1490%
Next $15 billion                   0.1380%
Next $25 billion                   0.1375%
Thereafter                         0.1370%

Schedule 2
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 2 Funds:
First $1 billion                   0.2700%                    Benham California Tax-Free Money Market Fund
Next $1 billion                    0.2270%                    Benham California Municipal Money Market Fund
Next $3 billion                    0.1860%                     Benham Florida Municipal Money Market Fund
Next $5 billion                    0.1690%                          Benham Tax-Free Money Market Fund
                                                    ------------------------------------------------------------------
Next $15 billion                   0.1580%
Next $25 billion                   0.1575%
Thereafter                         0.1570%

Schedule 3
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 3 Funds:
First $1 billion                   0.3700%                           Benham Prime Money Market Fund
                                                    ------------------------------------------------------------------
Next $1 billion                    0.3270%
Next $3 billion                    0.2860%
Next $5 billion                    0.2690%
Next $15 billion                   0.2580%
Next $25 billion                   0.2575%
Thereafter                         0.2570%




                       Category Fee Schedules: Bond Funds


Schedule 1
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 1 Funds:
First $1 billion                   0.2800%                           Benham Short-Term Treasury Fund
Next $1 billion                    0.2280%                       Benham Intermediate-Term Treasury Fund
Next $3 billion                    0.1980%                           Benham Long-Term Treasury Fund
Next $5 billion                    0.1780%                    Benham California Limited-Term Tax-Free Fund
Next $15 billion                   0.1650%                  Benham California Intermediate-Term Tax-Free Fund
Next $25 billion                   0.1630%                      Benham California Long-Term Tax-Free Fund
Thereafter                         0.1625%                       Benham California Insured Tax-Free Fund
                                                             Benham Arizona Intermediate-Term Municipal Fund
                                                             Benham Florida Intermediate-Term Municipal Fund
                                                                    Benham Limited-Term Tax-Free Fund
                                                                 Benham Intermediate-Term Tax-Free Fund
                                                                     Benham Long-Term Tax-Free Fund
                                                                 Benham Inflation-Adjusted Treasury Fund
                                                    ------------------------------------------------------------------

Schedule 2
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 2 Funds:
First $1 billion                   0.3100%                     Benham California High-Yield Municipal Fund
                                                    ------------------------------------------------------------------
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%
Thereafter                         0.1925%

Schedule 3
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 3 Funds:
First $1 billion                   0.3600%                                  Benham GNMA Fund
Next $1 billion                    0.3080%                          Benham Short-Term Government Fund
Next $3 billion                    0.2780%                        Benham Target Maturities Trust: 2000
Next $5 billion                    0.2580%                        Benham Target Maturities Trust: 2005
Next $15 billion                   0.2450%                        Benham Target Maturities Trust: 2010
Next $25 billion                   0.2430%                        Benham Target Maturities Trust: 2015
Thereafter                         0.2425%                        Benham Target Maturities Trust: 2020
                                                                  Benham Target Maturities Trust: 2025
                                                    ------------------------------------------------------------------




                       Category Fee Schedules: Bond Funds
                                   (continued)


Schedule 4
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 4 Funds:
First $1 billion                   0.6100%                           Benham International Bond Fund
                                                    ------------------------------------------------------------------
Next $1 billion                    0.5580%
Next $3 billion                    0.5280%
Next $5 billion                    0.5080%
Next $15 billion                   0.4950%
Next $25 billion                   0.4930%
Thereafter                         0.4925%

Schedule 5
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 5 Funds:
First $1 billion                   0.4100%                          Benham High-Yield Municipal Fund
                                                    ------------------------------------------------------------------
Next $1 billion                    0.3580%
Next $3 billion                    0.3280%
Next $5 billion                    0.3080%
Next $15 billion                   0.2950%
Next $25 billion                   0.2930%
Thereafter                         0.2925%


                      Category Fee Schedules: Equity Funds


Schedule 1
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 1 Funds:
First $1 billion                   0.5200%                         American Century Equity Growth Fund
Next $5 billion                    0.4600%                          American Century Global Gold Fund
Next $15 billion                   0.4160%                   American Century Global Natural Resources Fund
Next $25 billion                   0.3690%                        American Century Income & Growth Fund
Next $50 billion                   0.3420%                           American Century Utilities Fund
                                                    ------------------------------------------------------------------
Next $150 billion                  0.3390%
Thereafter                         0.3380%

Schedule 2
                                                    ------------------------------------------------------------------
Category Assets                    Fee Rate                                 Schedule 2 Funds:
First $1 billion                   0.7200%                        American Century Small Capitalization
Next $5 billion                    0.6600%                                  Quantitative Fund
                                                    ------------------------------------------------------------------
Next $15 billion                   0.6160%
Next $25 billion                   0.5690%
Next $50 billion                   0.5420%
Next $150 billion                  0.5390%
Thereafter                         0.5380%
</TABLE>

Dated:  July 1, 1998

                                        AMERICAN CENTURY CALIFORNIA TAX-FREE AND
                                             MUNICIPAL FUNDS
                                        AMERICAN CENTURY GOVERNMENT INCOME TRUST
                                        AMERICAN CENTURY INTERNATIONAL BOND
                                             FUNDS
                                        AMERICAN CENTURY INVESTMENT TRUST
                                        AMERICAN CENTURY MUNICIPAL TRUST
                                        AMERICAN CENTURY QUANTITATIVE EQUITY
                                             FUNDS
                                        AMERICAN CENTURY TARGET MATURITIES TRUST

AMERICAN CENTURY INVESTMENT
MANAGEMENT, INC.

As executed on behalf of the above in   As executed on behalf of the above in
Exhibit A by                            Exhibit A by

Robert C. Puff                          Douglas A. Paul
President                               Secretary
<PAGE>
                                    Exhibit D
                              Complex Fee Schedule

                        Complex Assets                                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%
                        Thereafter                                    0.2900%


Dated:  July 1, 1998

                                        AMERICAN CENTURY CALIFORNIA TAX-FREE AND
                                             MUNICIPAL FUNDS
                                        AMERICAN CENTURY GOVERNMENT INCOME TRUST
                                        AMERICAN CENTURY INTERNATIONAL BOND
                                             FUNDS
                                        AMERICAN CENTURY INVESTMENT TRUST
                                        AMERICAN CENTURY MUNICIPAL TRUST
                                        AMERICAN CENTURY QUANTITATIVE EQUITY
                                             FUNDS
                                        AMERICAN CENTURY TARGET MATURITIES TRUST

AMERICAN CENTURY INVESTMENT
MANAGEMENT, INC.

As executed on behalf of the above in   As executed on behalf of the above in
Exhibit A by                            Exhibit A by

/*/Robert C. Puff                       /*/Douglas A. Paul
Robert C. Puff                          Douglas A. Paul
President                               Secretary

                       Consent of Independent Accountants


We consent to the incorporation by reference in Post-Effective  Amendment No. 39
to the  Registration  Statement of the Short-Term  Government Fund (formerly the
American-Century  Benham  Short-Term  Government  Fund), the  Inflation-Adjusted
Treasury Fund (formerly the American  Century-Benham  Inflation-Adjusted  Fund),
the  Short-Term  Treasury  Fund,  Intermediate-Term  Treasury Fund and Long-Term
Treasury Fund (formerly the American  Century-Benham  Short-Term  Treasury Fund,
the American  Century-Benham  Intermediate-Term  Treasury Fund, and the American
Century-Benham Long-Term Treasury Fund,  respectively),  the GNMA Fund (formerly
the American  Century-Benham GNMA Fund), the Capital Preservation Fund (formerly
the American Century-Benham Capital Preservation Fund, and the Government Agency
Money Market Fund (formerly the American Century-Benham  Government Money Market
Fund)  (the  eight  funds  in the  American  Century  Government  Income  Trust,
hereafter  referred to as the "Funds"),  on Form N-1A of our report dated May 7,
1999 on our audits of the financial  statements and financial  highlights of the
Funds,  which report is included in the Annual  Report to  Shareholders  for the
year ended March 31, 1999,  which is  incorporated by reference in the Statement
of Additional Information.  We also consent to the reference in the Statement of
Additional Information to our Firm under the caption "Independent Accountants."


/s/PricewaterhouseCoopers LLP

Kansas City, Missouri
July 28, 1999
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 11
   <NAME> GNMA FUND INVESTOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                             MAR-31-1999
<PERIOD-END>                                  MAR-31-1999
<INVESTMENTS-AT-COST>                                     1,396,335,475
<INVESTMENTS-AT-VALUE>                                    1,413,340,718
<RECEIVABLES>                                                47,467,492
<ASSETS-OTHER>                                                4,574,474
<OTHER-ITEMS-ASSETS>                                                  0
<TOTAL-ASSETS>                                            1,465,382,684
<PAYABLE-FOR-SECURITIES>                                     40,145,104
<SENIOR-LONG-TERM-DEBT>                                               0
<OTHER-ITEMS-LIABILITIES>                                     2,720,859
<TOTAL-LIABILITIES>                                          42,865,963
<SENIOR-EQUITY>                                                       0
<PAID-IN-CAPITAL-COMMON>                                  1,427,068,233
<SHARES-COMMON-STOCK>                                       133,308,318
<SHARES-COMMON-PRIOR>                                       120,579,109
<ACCUMULATED-NII-CURRENT>                                             0
<OVERDISTRIBUTION-NII>                                                0
<ACCUMULATED-NET-GAINS>                                     (21,556,755)
<OVERDISTRIBUTION-GAINS>                                              0
<ACCUM-APPREC-OR-DEPREC>                                     17,005,243
<NET-ASSETS>                                              1,422,516,721
<DIVIDEND-INCOME>                                                     0
<INTEREST-INCOME>                                            88,813,632
<OTHER-INCOME>                                                        0
<EXPENSES-NET>                                                7,970,112
<NET-INVESTMENT-INCOME>                                      80,843,520
<REALIZED-GAINS-CURRENT>                                      2,433,855
<APPREC-INCREASE-CURRENT>                                    (9,003,273)
<NET-CHANGE-FROM-OPS>                                        74,274,102
<EQUALIZATION>                                                        0
<DISTRIBUTIONS-OF-INCOME>                                    80,723,297
<DISTRIBUTIONS-OF-GAINS>                                              0
<DISTRIBUTIONS-OTHER>                                                 0
<NUMBER-OF-SHARES-SOLD>                                      53,378,360
<NUMBER-OF-SHARES-REDEEMED>                                  46,668,723
<SHARES-REINVESTED>                                           6,062,643
<NET-CHANGE-IN-ASSETS>                                      136,416,333
<ACCUMULATED-NII-PRIOR>                                               0
<ACCUMULATED-GAINS-PRIOR>                                   (23,990,610)
<OVERDISTRIB-NII-PRIOR>                                               0
<OVERDIST-NET-GAINS-PRIOR>                                            0
<GROSS-ADVISORY-FEES>                                         7,912,932
<INTEREST-EXPENSE>                                                    0
<GROSS-EXPENSE>                                               7,970,112
<AVERAGE-NET-ASSETS>                                      1,385,130,354
<PER-SHARE-NAV-BEGIN>                                             10.67
<PER-SHARE-NII>                                                    0.64
<PER-SHARE-GAIN-APPREC>                                           (0.05)
<PER-SHARE-DIVIDEND>                                               0.64
<PER-SHARE-DISTRIBUTIONS>                                          0.00
<RETURNS-OF-CAPITAL>                                               0.00
<PER-SHARE-NAV-END>                                               10.62
<EXPENSE-RATIO>                                                    0.59
[AVG-DEBT-OUTSTANDING]                                                0
[AVG-DEBT-PER-SHARE]                                               0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 13
   <NAME> GNMA FUND ADVISOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                             MAR-31-1999
<PERIOD-END>                                  MAR-31-1999
<INVESTMENTS-AT-COST>                                     1,396,335,475
<INVESTMENTS-AT-VALUE>                                    1,413,340,718
<RECEIVABLES>                                                47,467,492
<ASSETS-OTHER>                                                4,574,474
<OTHER-ITEMS-ASSETS>                                                  0
<TOTAL-ASSETS>                                            1,465,382,684
<PAYABLE-FOR-SECURITIES>                                     40,145,104
<SENIOR-LONG-TERM-DEBT>                                               0
<OTHER-ITEMS-LIABILITIES>                                     2,720,859
<TOTAL-LIABILITIES>                                          42,865,963
<SENIOR-EQUITY>                                                       0
<PAID-IN-CAPITAL-COMMON>                                  1,427,068,233
<SHARES-COMMON-STOCK>                                           650,709
<SHARES-COMMON-PRIOR>                                               292
<ACCUMULATED-NII-CURRENT>                                             0
<OVERDISTRIBUTION-NII>                                                0
<ACCUMULATED-NET-GAINS>                                     (21,556,755)
<OVERDISTRIBUTION-GAINS>                                              0
<ACCUM-APPREC-OR-DEPREC>                                     17,005,243
<NET-ASSETS>                                              1,422,516,721
<DIVIDEND-INCOME>                                                     0
<INTEREST-INCOME>                                            88,813,632
<OTHER-INCOME>                                                        0
<EXPENSES-NET>                                                7,970,112
<NET-INVESTMENT-INCOME>                                      80,843,520
<REALIZED-GAINS-CURRENT>                                      2,433,855
<APPREC-INCREASE-CURRENT>                                    (9,003,273)
<NET-CHANGE-FROM-OPS>                                        74,274,102
<EQUALIZATION>                                                        0
<DISTRIBUTIONS-OF-INCOME>                                       192,401
<DISTRIBUTIONS-OF-GAINS>                                              0
<DISTRIBUTIONS-OTHER>                                                 0
<NUMBER-OF-SHARES-SOLD>                                         748,340
<NUMBER-OF-SHARES-REDEEMED>                                     157,042
<SHARES-REINVESTED>                                              16,340
<NET-CHANGE-IN-ASSETS>                                      136,416,333
<ACCUMULATED-NII-PRIOR>                                               0
<ACCUMULATED-GAINS-PRIOR>                                   (23,990,610)
<OVERDISTRIB-NII-PRIOR>                                               0
<OVERDIST-NET-GAINS-PRIOR>                                            0
<GROSS-ADVISORY-FEES>                                         7,912,932
<INTEREST-EXPENSE>                                                    0
<GROSS-EXPENSE>                                               7,970,112
<AVERAGE-NET-ASSETS>                                          4,817,713
<PER-SHARE-NAV-BEGIN>                                             10.67
<PER-SHARE-NII>                                                    0.61
<PER-SHARE-GAIN-APPREC>                                           (0.05)
<PER-SHARE-DIVIDEND>                                               0.61
<PER-SHARE-DISTRIBUTIONS>                                          0.00
<RETURNS-OF-CAPITAL>                                               0.00
<PER-SHARE-NAV-END>                                               10.62
<EXPENSE-RATIO>                                                    0.84
[AVG-DEBT-OUTSTANDING]                                                0
[AVG-DEBT-PER-SHARE]                                               0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 21
   <NAME> INTERMEDIATE-TERM TREASURY FUND INVESTOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                             MAR-31-1999
<PERIOD-END>                                  MAR-31-1999
<INVESTMENTS-AT-COST>                                      441,026,526
<INVESTMENTS-AT-VALUE>                                     434,809,130
<RECEIVABLES>                                                6,506,984
<ASSETS-OTHER>                                                 927,368
<OTHER-ITEMS-ASSETS>                                                 0
<TOTAL-ASSETS>                                             442,243,482
<PAYABLE-FOR-SECURITIES>                                             0
<SENIOR-LONG-TERM-DEBT>                                              0
<OTHER-ITEMS-LIABILITIES>                                      631,828
<TOTAL-LIABILITIES>                                            631,828
<SENIOR-EQUITY>                                                      0
<PAID-IN-CAPITAL-COMMON>                                   446,062,648
<SHARES-COMMON-STOCK>                                       41,677,529
<SHARES-COMMON-PRIOR>                                       36,468,965
<ACCUMULATED-NII-CURRENT>                                            0
<OVERDISTRIBUTION-NII>                                               0
<ACCUMULATED-NET-GAINS>                                      1,766,402
<OVERDISTRIBUTION-GAINS>                                             0
<ACCUM-APPREC-OR-DEPREC>                                    (6,217,396)
<NET-ASSETS>                                               441,611,654
<DIVIDEND-INCOME>                                                    0
<INTEREST-INCOME>                                           23,135,883
<OTHER-INCOME>                                                       0
<EXPENSES-NET>                                               2,140,496
<NET-INVESTMENT-INCOME>                                     20,995,387
<REALIZED-GAINS-CURRENT>                                     9,269,222
<APPREC-INCREASE-CURRENT>                                   (7,602,642)
<NET-CHANGE-FROM-OPS>                                       22,661,967
<EQUALIZATION>                                                       0
<DISTRIBUTIONS-OF-INCOME>                                   20,921,594
<DISTRIBUTIONS-OF-GAINS>                                     8,543,680
<DISTRIBUTIONS-OTHER>                                                0
<NUMBER-OF-SHARES-SOLD>                                     29,173,347
<NUMBER-OF-SHARES-REDEEMED>                                 25,416,559
<SHARES-REINVESTED>                                          2,435,272
<NET-CHANGE-IN-ASSETS>                                      66,622,858
<ACCUMULATED-NII-PRIOR>                                              0
<ACCUMULATED-GAINS-PRIOR>                                    1,078,153
<OVERDISTRIB-NII-PRIOR>                                              0
<OVERDIST-NET-GAINS-PRIOR>                                           0
<GROSS-ADVISORY-FEES>                                        2,114,983
<INTEREST-EXPENSE>                                                   0
<GROSS-EXPENSE>                                              2,140,496
<AVERAGE-NET-ASSETS>                                       443,834,622
<PER-SHARE-NAV-BEGIN>                                            10.56
<PER-SHARE-NII>                                                   0.54
<PER-SHARE-GAIN-APPREC>                                           0.10
<PER-SHARE-DIVIDEND>                                              0.54
<PER-SHARE-DISTRIBUTIONS>                                         0.21
<RETURNS-OF-CAPITAL>                                              0.00
<PER-SHARE-NAV-END>                                              10.45
<EXPENSE-RATIO>                                                   0.51
[AVG-DEBT-OUTSTANDING]                                               0
[AVG-DEBT-PER-SHARE]                                              0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 23
   <NAME> INTERMEDIATE-TERM TREASURY FUND ADVISOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                             MAR-31-1999
<PERIOD-END>                                  MAR-31-1999
<INVESTMENTS-AT-COST>                                      441,026,526
<INVESTMENTS-AT-VALUE>                                     434,809,130
<RECEIVABLES>                                                6,506,984
<ASSETS-OTHER>                                                 927,368
<OTHER-ITEMS-ASSETS>                                                 0
<TOTAL-ASSETS>                                             442,243,482
<PAYABLE-FOR-SECURITIES>                                             0
<SENIOR-LONG-TERM-DEBT>                                              0
<OTHER-ITEMS-LIABILITIES>                                      631,828
<TOTAL-LIABILITIES>                                            631,828
<SENIOR-EQUITY>                                                      0
<PAID-IN-CAPITAL-COMMON>                                   446,062,648
<SHARES-COMMON-STOCK>                                          585,453
<SHARES-COMMON-PRIOR>                                           28,609
<ACCUMULATED-NII-CURRENT>                                            0
<OVERDISTRIBUTION-NII>                                               0
<ACCUMULATED-NET-GAINS>                                      1,766,402
<OVERDISTRIBUTION-GAINS>                                             0
<ACCUM-APPREC-OR-DEPREC>                                    (6,217,396)
<NET-ASSETS>                                               441,611,654
<DIVIDEND-INCOME>                                                    0
<INTEREST-INCOME>                                           23,135,883
<OTHER-INCOME>                                                       0
<EXPENSES-NET>                                               2,140,496
<NET-INVESTMENT-INCOME>                                     20,995,387
<REALIZED-GAINS-CURRENT>                                     9,269,222
<APPREC-INCREASE-CURRENT>                                   (7,602,642)
<NET-CHANGE-FROM-OPS>                                       22,661,967
<EQUALIZATION>                                                       0
<DISTRIBUTIONS-OF-INCOME>                                       73,793
<DISTRIBUTIONS-OF-GAINS>                                        37,293
<DISTRIBUTIONS-OTHER>                                                0
<NUMBER-OF-SHARES-SOLD>                                        591,748
<NUMBER-OF-SHARES-REDEEMED>                                     27,956
<SHARES-REINVESTED>                                              9,556
<NET-CHANGE-IN-ASSETS>                                      66,622,858
<ACCUMULATED-NII-PRIOR>                                              0
<ACCUMULATED-GAINS-PRIOR>                                    1,078,153
<OVERDISTRIB-NII-PRIOR>                                              0
<OVERDIST-NET-GAINS-PRIOR>                                           0
<GROSS-ADVISORY-FEES>                                        2,114,983
<INTEREST-EXPENSE>                                                   0
<GROSS-EXPENSE>                                              2,140,496
<AVERAGE-NET-ASSETS>                                         2,956,389
<PER-SHARE-NAV-BEGIN>                                            10.56
<PER-SHARE-NII>                                                   0.51
<PER-SHARE-GAIN-APPREC>                                           0.10
<PER-SHARE-DIVIDEND>                                              0.51
<PER-SHARE-DISTRIBUTIONS>                                         0.21
<RETURNS-OF-CAPITAL>                                              0.00
<PER-SHARE-NAV-END>                                              10.45
<EXPENSE-RATIO>                                                   0.76
[AVG-DEBT-OUTSTANDING]                                               0
[AVG-DEBT-PER-SHARE]                                              0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 31
   <NAME> GOVERNMENT AGENCY MONEY MARKET FUND

<S>                                           <C>
<PERIOD-TYPE>                               YEAR
<FISCAL-YEAR-END>                           MAR-31-1999
<PERIOD-END>                                MAR-31-1999
<INVESTMENTS-AT-COST>                                    504,046,064
<INVESTMENTS-AT-VALUE>                                   504,046,064
<RECEIVABLES>                                             28,675,633
<ASSETS-OTHER>                                               968,809
<OTHER-ITEMS-ASSETS>                                               0
<TOTAL-ASSETS>                                           533,690,506
<PAYABLE-FOR-SECURITIES>                                           0
<SENIOR-LONG-TERM-DEBT>                                            0
<OTHER-ITEMS-LIABILITIES>                                  5,848,505
<TOTAL-LIABILITIES>                                        5,848,505
<SENIOR-EQUITY>                                                    0
<PAID-IN-CAPITAL-COMMON>                                 527,842,001
<SHARES-COMMON-STOCK>                                    527,842,001
<SHARES-COMMON-PRIOR>                                    487,813,820
<ACCUMULATED-NII-CURRENT>                                          0
<OVERDISTRIBUTION-NII>                                             0
<ACCUMULATED-NET-GAINS>                                            0
<OVERDISTRIBUTION-GAINS>                                           0
<ACCUM-APPREC-OR-DEPREC>                                           0
<NET-ASSETS>                                             527,842,001
<DIVIDEND-INCOME>                                                  0
<INTEREST-INCOME>                                         26,447,798
<OTHER-INCOME>                                                     0
<EXPENSES-NET>                                             2,396,976
<NET-INVESTMENT-INCOME>                                   24,050,822
<REALIZED-GAINS-CURRENT>                                           0
<APPREC-INCREASE-CURRENT>                                          0
<NET-CHANGE-FROM-OPS>                                     24,084,404
<EQUALIZATION>                                                     0
<DISTRIBUTIONS-OF-INCOME>                                 24,050,822
<DISTRIBUTIONS-OF-GAINS>                                      11,109
<DISTRIBUTIONS-OTHER>                                              0
<NUMBER-OF-SHARES-SOLD>                                  431,797,001
<NUMBER-OF-SHARES-REDEEMED>                              414,936,146
<SHARES-REINVESTED>                                       23,167,326
<NET-CHANGE-IN-ASSETS>                                    40,050,654
<ACCUMULATED-NII-PRIOR>                                            0
<ACCUMULATED-GAINS-PRIOR>                                    (22,473)
<OVERDISTRIB-NII-PRIOR>                                            0
<OVERDIST-NET-GAINS-PRIOR>                                         0
<GROSS-ADVISORY-FEES>                                      5,573,911
<INTEREST-EXPENSE>                                                 0
<GROSS-EXPENSE>                                            5,848,505
<AVERAGE-NET-ASSETS>                                     502,517,948
<PER-SHARE-NAV-BEGIN>                                           1.00
<PER-SHARE-NII>                                                 0.05
<PER-SHARE-GAIN-APPREC>                                         0.00
<PER-SHARE-DIVIDEND>                                            0.05
<PER-SHARE-DISTRIBUTIONS>                                       0.00
<RETURNS-OF-CAPITAL>                                            0.00
<PER-SHARE-NAV-END>                                             1.00
<EXPENSE-RATIO>                                                 0.48
[AVG-DEBT-OUTSTANDING]                                             0
[AVG-DEBT-PER-SHARE]                                            0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 91
   <NAME> SHORT-TERM GOVERNMENT FUND INVESTOR CLASS
<MULTIPLIER>                                                         1000

<S>                       <C>
<PERIOD-TYPE>                                    YEAR
<FISCAL-YEAR-END>                                MAR-31-1999
<PERIOD-END>                                     MAR-31-1999
<INVESTMENTS-AT-COST>                                             826,716
<INVESTMENTS-AT-VALUE>                                            826,555
<RECEIVABLES>                                                       7,344
<ASSETS-OTHER>                                                        242
<OTHER-ITEMS-ASSETS>                                                    0
<TOTAL-ASSETS>                                                    834,141
<PAYABLE-FOR-SECURITIES>                                                0
<SENIOR-LONG-TERM-DEBT>                                                 0
<OTHER-ITEMS-LIABILITIES>                                           1,703
<TOTAL-LIABILITIES>                                                 1,703
<SENIOR-EQUITY>                                                       879
<PAID-IN-CAPITAL-COMMON>                                          911,258
<SHARES-COMMON-STOCK>                                              87,891
<SHARES-COMMON-PRIOR>                                              85,364
<ACCUMULATED-NII-CURRENT>                                               0
<OVERDISTRIBUTION-NII>                                                  0
<ACCUMULATED-NET-GAINS>                                           (79,538)
<OVERDISTRIBUTION-GAINS>                                                0
<ACCUM-APPREC-OR-DEPREC>                                             (161)
<NET-ASSETS>                                                      832,438
<DIVIDEND-INCOME>                                                       0
<INTEREST-INCOME>                                                  47,250
<OTHER-INCOME>                                                          0
<EXPENSES-NET>                                                      4,849
<NET-INVESTMENT-INCOME>                                            42,401
<REALIZED-GAINS-CURRENT>                                              586
<APPREC-INCREASE-CURRENT>                                             287
<NET-CHANGE-FROM-OPS>                                              43,274
<EQUALIZATION>                                                          0
<DISTRIBUTIONS-OF-INCOME>                                          42,400
<DISTRIBUTIONS-OF-GAINS>                                                0
<DISTRIBUTIONS-OTHER>                                                   0
<NUMBER-OF-SHARES-SOLD>                                            18,555
<NUMBER-OF-SHARES-REDEEMED>                                        20,283
<SHARES-REINVESTED>                                                 4,159
<NET-CHANGE-IN-ASSETS>                                             23,101
<ACCUMULATED-NII-PRIOR>                                                 0
<ACCUMULATED-GAINS-PRIOR>                                         (80,124)
<OVERDISTRIB-NII-PRIOR>                                                 0
<OVERDIST-NET-GAINS-PRIOR>                                              0
<GROSS-ADVISORY-FEES>                                               4,822
<INTEREST-EXPENSE>                                                      0
<GROSS-EXPENSE>                                                     4,849
<AVERAGE-NET-ASSETS>                                              828,757
<PER-SHARE-NAV-BEGIN>                                                9.46
<PER-SHARE-NII>                                                      0.49
<PER-SHARE-GAIN-APPREC>                                              0.01
<PER-SHARE-DIVIDEND>                                                 0.49
<PER-SHARE-DISTRIBUTIONS>                                            0.00
<RETURNS-OF-CAPITAL>                                                 0.00
<PER-SHARE-NAV-END>                                                  9.47
<EXPENSE-RATIO>                                                      0.59
[AVG-DEBT-OUTSTANDING]                                                  0
[AVG-DEBT-PER-SHARE]                                                 0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 93
   <NAME> SHORT-TERM GOVERNMENT FUND ADVISOR CLASS
<MULTIPLIER>                                                         1000

<S>                       <C>
<PERIOD-TYPE>                                    YEAR
<FISCAL-YEAR-END>                                MAR-31-1999
<PERIOD-END>                                     MAR-31-1999
<INVESTMENTS-AT-COST>                                             826,716
<INVESTMENTS-AT-VALUE>                                            826,555
<RECEIVABLES>                                                       7,344
<ASSETS-OTHER>                                                        242
<OTHER-ITEMS-ASSETS>                                                    0
<TOTAL-ASSETS>                                                    834,141
<PAYABLE-FOR-SECURITIES>                                                0
<SENIOR-LONG-TERM-DEBT>                                                 0
<OTHER-ITEMS-LIABILITIES>                                           1,703
<TOTAL-LIABILITIES>                                                 1,703
<SENIOR-EQUITY>                                                       879
<PAID-IN-CAPITAL-COMMON>                                          911,258
<SHARES-COMMON-STOCK>                                                  10
<SHARES-COMMON-PRIOR>                                                  96
<ACCUMULATED-NII-CURRENT>                                               0
<OVERDISTRIBUTION-NII>                                                  0
<ACCUMULATED-NET-GAINS>                                           (79,538)
<OVERDISTRIBUTION-GAINS>                                                0
<ACCUM-APPREC-OR-DEPREC>                                             (161)
<NET-ASSETS>                                                      832,438
<DIVIDEND-INCOME>                                                       0
<INTEREST-INCOME>                                                  47,250
<OTHER-INCOME>                                                          0
<EXPENSES-NET>                                                      4,849
<NET-INVESTMENT-INCOME>                                            42,401
<REALIZED-GAINS-CURRENT>                                              586
<APPREC-INCREASE-CURRENT>                                             287
<NET-CHANGE-FROM-OPS>                                              43,274
<EQUALIZATION>                                                          0
<DISTRIBUTIONS-OF-INCOME>                                               1
<DISTRIBUTIONS-OF-GAINS>                                                0
<DISTRIBUTIONS-OTHER>                                                   0
<NUMBER-OF-SHARES-SOLD>                                                12
<NUMBER-OF-SHARES-REDEEMED>                                             2
<SHARES-REINVESTED>                                                     0
<NET-CHANGE-IN-ASSETS>                                             23,101
<ACCUMULATED-NII-PRIOR>                                                 0
<ACCUMULATED-GAINS-PRIOR>                                         (80,124)
<OVERDISTRIB-NII-PRIOR>                                                 0
<OVERDIST-NET-GAINS-PRIOR>                                              0
<GROSS-ADVISORY-FEES>                                               4,822
<INTEREST-EXPENSE>                                                      0
<GROSS-EXPENSE>                                                     4,849
<AVERAGE-NET-ASSETS>                                                   39
<PER-SHARE-NAV-BEGIN>                                                9.49
<PER-SHARE-NII>                                                      0.33
<PER-SHARE-GAIN-APPREC>                                             (0.02)
<PER-SHARE-DIVIDEND>                                                 0.33
<PER-SHARE-DISTRIBUTIONS>                                            0.00
<RETURNS-OF-CAPITAL>                                                 0.00
<PER-SHARE-NAV-END>                                                  9.47
<EXPENSE-RATIO>                                                      0.84
[AVG-DEBT-OUTSTANDING]                                                  0
[AVG-DEBT-PER-SHARE]                                                 0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 51
   <NAME> SHORT-TERM TREASURY FUND INVESTOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                      YEAR
<FISCAL-YEAR-END>                                  MAR-31-1999
<PERIOD-END>                                       MAR-31-1999
<INVESTMENTS-AT-COST>                                            64,886,167
<INVESTMENTS-AT-VALUE>                                           64,988,948
<RECEIVABLES>                                                     9,877,413
<ASSETS-OTHER>                                                      998,015
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                   75,864,376
<PAYABLE-FOR-SECURITIES>                                         10,860,402
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                           118,943
<TOTAL-LIABILITIES>                                              10,979,345
<SENIOR-EQUITY>                                                           0
<PAID-IN-CAPITAL-COMMON>                                         64,761,277
<SHARES-COMMON-STOCK>                                             6,275,316
<SHARES-COMMON-PRIOR>                                             4,316,190
<ACCUMULATED-NII-CURRENT>                                                 0
<OVERDISTRIBUTION-NII>                                                    0
<ACCUMULATED-NET-GAINS>                                              20,973
<OVERDISTRIBUTION-GAINS>                                                  0
<ACCUM-APPREC-OR-DEPREC>                                            102,781
<NET-ASSETS>                                                     64,885,031
<DIVIDEND-INCOME>                                                         0
<INTEREST-INCOME>                                                 2,853,682
<OTHER-INCOME>                                                            0
<EXPENSES-NET>                                                      274,670
<NET-INVESTMENT-INCOME>                                           2,579,012
<REALIZED-GAINS-CURRENT>                                            211,046
<APPREC-INCREASE-CURRENT>                                           (65,450)
<NET-CHANGE-FROM-OPS>                                             2,724,608
<EQUALIZATION>                                                            0
<DISTRIBUTIONS-OF-INCOME>                                         2,463,442
<DISTRIBUTIONS-OF-GAINS>                                                  0
<DISTRIBUTIONS-OTHER>                                                     0
<NUMBER-OF-SHARES-SOLD>                                           4,412,757
<NUMBER-OF-SHARES-REDEEMED>                                       2,502,210
<SHARES-REINVESTED>                                                 193,505
<NET-CHANGE-IN-ASSETS>                                           22,550,302
<ACCUMULATED-NII-PRIOR>                                                   0
<ACCUMULATED-GAINS-PRIOR>                                          (190,073)
<OVERDISTRIB-NII-PRIOR>                                                   0
<OVERDIST-NET-GAINS-PRIOR>                                                0
<GROSS-ADVISORY-FEES>                                               259,763
<INTEREST-EXPENSE>                                                        0
<GROSS-EXPENSE>                                                     274,670
<AVERAGE-NET-ASSETS>                                             56,425,351
<PER-SHARE-NAV-BEGIN>                                                  9.80
<PER-SHARE-NII>                                                        0.49
<PER-SHARE-GAIN-APPREC>                                                0.05
<PER-SHARE-DIVIDEND>                                                   0.49
<PER-SHARE-DISTRIBUTIONS>                                              0.00
<RETURNS-OF-CAPITAL>                                                   0.00
<PER-SHARE-NAV-END>                                                    9.85
<EXPENSE-RATIO>                                                        0.51
[AVG-DEBT-OUTSTANDING]                                                    0
[AVG-DEBT-PER-SHARE]                                                   0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 53
   <NAME> SHORT-TERM TREASURY FUND ADVISOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                      YEAR
<FISCAL-YEAR-END>                                  MAR-31-1999
<PERIOD-END>                                       MAR-31-1999
<INVESTMENTS-AT-COST>                                            64,886,167
<INVESTMENTS-AT-VALUE>                                           64,988,948
<RECEIVABLES>                                                     9,877,413
<ASSETS-OTHER>                                                      998,015
<OTHER-ITEMS-ASSETS>                                                      0
<TOTAL-ASSETS>                                                   75,864,376
<PAYABLE-FOR-SECURITIES>                                         10,860,402
<SENIOR-LONG-TERM-DEBT>                                                   0
<OTHER-ITEMS-LIABILITIES>                                           118,943
<TOTAL-LIABILITIES>                                              10,979,345
<SENIOR-EQUITY>                                                           0
<PAID-IN-CAPITAL-COMMON>                                         64,761,277
<SHARES-COMMON-STOCK>                                               315,062
<SHARES-COMMON-PRIOR>                                                 4,107
<ACCUMULATED-NII-CURRENT>                                                 0
<OVERDISTRIBUTION-NII>                                                    0
<ACCUMULATED-NET-GAINS>                                              20,973
<OVERDISTRIBUTION-GAINS>                                                  0
<ACCUM-APPREC-OR-DEPREC>                                            102,781
<NET-ASSETS>                                                     64,885,031
<DIVIDEND-INCOME>                                                         0
<INTEREST-INCOME>                                                 2,853,682
<OTHER-INCOME>                                                            0
<EXPENSES-NET>                                                      274,670
<NET-INVESTMENT-INCOME>                                           2,579,012
<REALIZED-GAINS-CURRENT>                                            211,046
<APPREC-INCREASE-CURRENT>                                           (65,450)
<NET-CHANGE-FROM-OPS>                                             2,724,608
<EQUALIZATION>                                                            0
<DISTRIBUTIONS-OF-INCOME>                                           115,570
<DISTRIBUTIONS-OF-GAINS>                                                  0
<DISTRIBUTIONS-OTHER>                                                     0
<NUMBER-OF-SHARES-SOLD>                                             242,695
<NUMBER-OF-SHARES-REDEEMED>                                          88,171
<SHARES-REINVESTED>                                                  11,505
<NET-CHANGE-IN-ASSETS>                                           22,550,302
<ACCUMULATED-NII-PRIOR>                                                   0
<ACCUMULATED-GAINS-PRIOR>                                          (190,073)
<OVERDISTRIB-NII-PRIOR>                                                   0
<OVERDIST-NET-GAINS-PRIOR>                                                0
<GROSS-ADVISORY-FEES>                                               259,763
<INTEREST-EXPENSE>                                                        0
<GROSS-EXPENSE>                                                     274,670
<AVERAGE-NET-ASSETS>                                              2,763,154
<PER-SHARE-NAV-BEGIN>                                                  9.80
<PER-SHARE-NII>                                                        0.46
<PER-SHARE-GAIN-APPREC>                                                0.05
<PER-SHARE-DIVIDEND>                                                   0.46
<PER-SHARE-DISTRIBUTIONS>                                              0.00
<RETURNS-OF-CAPITAL>                                                   0.00
<PER-SHARE-NAV-END>                                                    9.85
<EXPENSE-RATIO>                                                        0.76
[AVG-DEBT-OUTSTANDING]                                                    0
[AVG-DEBT-PER-SHARE]                                                   0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 61
   <NAME> LONG-TERM TREASURY FUND INVESTOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                    YEAR
<FISCAL-YEAR-END>                                MAR-31-1999
<PERIOD-END>                                     MAR-31-1999
<INVESTMENTS-AT-COST>                                         136,985,955
<INVESTMENTS-AT-VALUE>                                        138,836,231
<RECEIVABLES>                                                   1,679,271
<ASSETS-OTHER>                                                    339,363
<OTHER-ITEMS-ASSETS>                                                    0
<TOTAL-ASSETS>                                                140,854,865
<PAYABLE-FOR-SECURITIES>                                                0
<SENIOR-LONG-TERM-DEBT>                                                 0
<OTHER-ITEMS-LIABILITIES>                                         715,536
<TOTAL-LIABILITIES>                                               715,536
<SENIOR-EQUITY>                                                         0
<PAID-IN-CAPITAL-COMMON>                                      139,113,017
<SHARES-COMMON-STOCK>                                          13,596,076
<SHARES-COMMON-PRIOR>                                           9,795,397
<ACCUMULATED-NII-CURRENT>                                               0
<OVERDISTRIBUTION-NII>                                                  0
<ACCUMULATED-NET-GAINS>                                          (823,964)
<OVERDISTRIBUTION-GAINS>                                                0
<ACCUM-APPREC-OR-DEPREC>                                        1,850,276
<NET-ASSETS>                                                  140,139,329
<DIVIDEND-INCOME>                                                       0
<INTEREST-INCOME>                                               7,912,413
<OTHER-INCOME>                                                          0
<EXPENSES-NET>                                                    689,644
<NET-INVESTMENT-INCOME>                                         7,222,769
<REALIZED-GAINS-CURRENT>                                        5,981,743
<APPREC-INCREASE-CURRENT>                                      (7,972,679)
<NET-CHANGE-FROM-OPS>                                           5,231,833
<EQUALIZATION>                                                          0
<DISTRIBUTIONS-OF-INCOME>                                       7,164,769
<DISTRIBUTIONS-OF-GAINS>                                        7,472,735
<DISTRIBUTIONS-OTHER>                                             788,886
<NUMBER-OF-SHARES-SOLD>                                        18,059,945
<NUMBER-OF-SHARES-REDEEMED>                                    15,570,167
<SHARES-REINVESTED>                                             1,331,429
<NET-CHANGE-IN-ASSETS>                                         36,540,003
<ACCUMULATED-NII-PRIOR>                                                 0
<ACCUMULATED-GAINS-PRIOR>                                       1,539,394
<OVERDISTRIB-NII-PRIOR>                                                 0
<OVERDIST-NET-GAINS-PRIOR>                                              0
<GROSS-ADVISORY-FEES>                                             677,423
<INTEREST-EXPENSE>                                                      0
<GROSS-EXPENSE>                                                   689,644
<AVERAGE-NET-ASSETS>                                          156,006,289
<PER-SHARE-NAV-BEGIN>                                               10.58
<PER-SHARE-NII>                                                      0.58
<PER-SHARE-GAIN-APPREC>                                              0.11
<PER-SHARE-DIVIDEND>                                                 0.58
<PER-SHARE-DISTRIBUTIONS>                                            0.52
<RETURNS-OF-CAPITAL>                                                 0.05
<PER-SHARE-NAV-END>                                                 10.12
<EXPENSE-RATIO>                                                      0.51
[AVG-DEBT-OUTSTANDING]                                                  0
[AVG-DEBT-PER-SHARE]                                                    0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 63
   <NAME> LONG-TERM TREASURY FUND ADVISOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                    YEAR
<FISCAL-YEAR-END>                                MAR-31-1999
<PERIOD-END>                                     MAR-31-1999
<INVESTMENTS-AT-COST>                                         136,985,955
<INVESTMENTS-AT-VALUE>                                        138,836,231
<RECEIVABLES>                                                   1,679,271
<ASSETS-OTHER>                                                    339,363
<OTHER-ITEMS-ASSETS>                                                    0
<TOTAL-ASSETS>                                                140,854,865
<PAYABLE-FOR-SECURITIES>                                                0
<SENIOR-LONG-TERM-DEBT>                                                 0
<OTHER-ITEMS-LIABILITIES>                                         715,536
<TOTAL-LIABILITIES>                                               715,536
<SENIOR-EQUITY>                                                         0
<PAID-IN-CAPITAL-COMMON>                                      139,113,017
<SHARES-COMMON-STOCK>                                             255,748
<SHARES-COMMON-PRIOR>                                                  47
<ACCUMULATED-NII-CURRENT>                                               0
<OVERDISTRIBUTION-NII>                                                  0
<ACCUMULATED-NET-GAINS>                                          (823,964)
<OVERDISTRIBUTION-GAINS>                                                0
<ACCUM-APPREC-OR-DEPREC>                                        1,850,276
<NET-ASSETS>                                                  140,139,329
<DIVIDEND-INCOME>                                                       0
<INTEREST-INCOME>                                               7,912,413
<OTHER-INCOME>                                                          0
<EXPENSES-NET>                                                    689,644
<NET-INVESTMENT-INCOME>                                         7,222,769
<REALIZED-GAINS-CURRENT>                                        5,981,743
<APPREC-INCREASE-CURRENT>                                      (7,972,679)
<NET-CHANGE-FROM-OPS>                                           5,231,833
<EQUALIZATION>                                                          0
<DISTRIBUTIONS-OF-INCOME>                                          58,000
<DISTRIBUTIONS-OF-GAINS>                                           48,402
<DISTRIBUTIONS-OTHER>                                              35,078
<NUMBER-OF-SHARES-SOLD>                                           288,248
<NUMBER-OF-SHARES-REDEEMED>                                        64,830
<SHARES-REINVESTED>                                                11,707
<NET-CHANGE-IN-ASSETS>                                         36,540,003
<ACCUMULATED-NII-PRIOR>                                                 0
<ACCUMULATED-GAINS-PRIOR>                                       1,539,394
<OVERDISTRIB-NII-PRIOR>                                                 0
<OVERDIST-NET-GAINS-PRIOR>                                              0
<GROSS-ADVISORY-FEES>                                             677,423
<INTEREST-EXPENSE>                                                      0
<GROSS-EXPENSE>                                                   689,644
<AVERAGE-NET-ASSETS>                                            1,741,479
<PER-SHARE-NAV-BEGIN>                                               10.58
<PER-SHARE-NII>                                                      0.56
<PER-SHARE-GAIN-APPREC>                                              0.11
<PER-SHARE-DIVIDEND>                                                 0.56
<PER-SHARE-DISTRIBUTIONS>                                            0.34
<RETURNS-OF-CAPITAL>                                                 0.23
<PER-SHARE-NAV-END>                                                 10.12
<EXPENSE-RATIO>                                                      0.76
[AVG-DEBT-OUTSTANDING]                                                  0
[AVG-DEBT-PER-SHARE]                                                    0


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 71
   <NAME> INFLATION-ADJUSTED TREASURY FUND INVESTOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                YEAR
<FISCAL-YEAR-END>                            MAR-31-1999
<PERIOD-END>                                 MAR-31-1999
<INVESTMENTS-AT-COST>                                       8,900,315
<INVESTMENTS-AT-VALUE>                                      8,736,683
<RECEIVABLES>                                                  78,140
<ASSETS-OTHER>                                                198,245
<OTHER-ITEMS-ASSETS>                                                0
<TOTAL-ASSETS>                                              9,013,068
<PAYABLE-FOR-SECURITIES>                                            0
<SENIOR-LONG-TERM-DEBT>                                             0
<OTHER-ITEMS-LIABILITIES>                                      22,407
<TOTAL-LIABILITIES>                                            22,407
<SENIOR-EQUITY>                                                     0
<PAID-IN-CAPITAL-COMMON>                                    9,224,890
<SHARES-COMMON-STOCK>                                         947,516
<SHARES-COMMON-PRIOR>                                         549,782
<ACCUMULATED-NII-CURRENT>                                           0
<OVERDISTRIBUTION-NII>                                              0
<ACCUMULATED-NET-GAINS>                                       (70,597)
<OVERDISTRIBUTION-GAINS>                                            0
<ACCUM-APPREC-OR-DEPREC>                                     (163,632)
<NET-ASSETS>                                                8,990,661
<DIVIDEND-INCOME>                                                   0
<INTEREST-INCOME>                                             373,125
<OTHER-INCOME>                                                      0
<EXPENSES-NET>                                                 34,624
<NET-INVESTMENT-INCOME>                                       338,501
<REALIZED-GAINS-CURRENT>                                      (20,024)
<APPREC-INCREASE-CURRENT>                                    (111,410)
<NET-CHANGE-FROM-OPS>                                         207,067
<EQUALIZATION>                                                      0
<DISTRIBUTIONS-OF-INCOME>                                     338,135
<DISTRIBUTIONS-OF-GAINS>                                            0
<DISTRIBUTIONS-OTHER>                                               0
<NUMBER-OF-SHARES-SOLD>                                       663,668
<NUMBER-OF-SHARES-REDEEMED>                                   295,763
<SHARES-REINVESTED>                                            31,279
<NET-CHANGE-IN-ASSETS>                                      3,711,283
<ACCUMULATED-NII-PRIOR>                                       (50,573)
<ACCUMULATED-GAINS-PRIOR>                                           0
<OVERDISTRIB-NII-PRIOR>                                             0
<OVERDIST-NET-GAINS-PRIOR>                                          0
<GROSS-ADVISORY-FEES>                                          34,333
<INTEREST-EXPENSE>                                                  0
<GROSS-EXPENSE>                                                34,624
<AVERAGE-NET-ASSETS>                                        8,143,674
<PER-SHARE-NAV-BEGIN>                                            9.63
<PER-SHARE-NII>                                                  0.47
<PER-SHARE-GAIN-APPREC>                                         (0.15)
<PER-SHARE-DIVIDEND>                                             0.47
<PER-SHARE-DISTRIBUTIONS>                                        0.00
<RETURNS-OF-CAPITAL>                                             0.00
<PER-SHARE-NAV-END>                                              9.48
<EXPENSE-RATIO>                                                  0.49
[AVG-DEBT-OUTSTANDING]                                              0
[AVG-DEBT-PER-SHARE]                                             0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 73
   <NAME> INFLATION-ADJUSTED TREASURY FUND ADVISOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                YEAR
<FISCAL-YEAR-END>                            MAR-31-1999
<PERIOD-END>                                 MAR-31-1999
<INVESTMENTS-AT-COST>                                       8,900,315
<INVESTMENTS-AT-VALUE>                                      8,736,683
<RECEIVABLES>                                                  78,140
<ASSETS-OTHER>                                                198,245
<OTHER-ITEMS-ASSETS>                                                0
<TOTAL-ASSETS>                                              9,013,068
<PAYABLE-FOR-SECURITIES>                                            0
<SENIOR-LONG-TERM-DEBT>                                             0
<OTHER-ITEMS-LIABILITIES>                                      22,407
<TOTAL-LIABILITIES>                                            22,407
<SENIOR-EQUITY>                                                     0
<PAID-IN-CAPITAL-COMMON>                                    9,224,890
<SHARES-COMMON-STOCK>                                           1,080
<SHARES-COMMON-PRIOR>                                           1,450
<ACCUMULATED-NII-CURRENT>                                           0
<OVERDISTRIBUTION-NII>                                              0
<ACCUMULATED-NET-GAINS>                                       (70,597)
<OVERDISTRIBUTION-GAINS>                                            0
<ACCUM-APPREC-OR-DEPREC>                                     (163,632)
<NET-ASSETS>                                                8,990,661
<DIVIDEND-INCOME>                                                   0
<INTEREST-INCOME>                                             373,125
<OTHER-INCOME>                                                      0
<EXPENSES-NET>                                                 34,624
<NET-INVESTMENT-INCOME>                                       338,501
<REALIZED-GAINS-CURRENT>                                      (20,024)
<APPREC-INCREASE-CURRENT>                                    (111,410)
<NET-CHANGE-FROM-OPS>                                         207,067
<EQUALIZATION>                                                      0
<DISTRIBUTIONS-OF-INCOME>                                         366
<DISTRIBUTIONS-OF-GAINS>                                            0
<DISTRIBUTIONS-OTHER>                                               0
<NUMBER-OF-SHARES-SOLD>                                         1,043
<NUMBER-OF-SHARES-REDEEMED>                                         0
<SHARES-REINVESTED>                                                37
<NET-CHANGE-IN-ASSETS>                                      3,711,283
<ACCUMULATED-NII-PRIOR>                                       (50,573)
<ACCUMULATED-GAINS-PRIOR>                                           0
<OVERDISTRIB-NII-PRIOR>                                             0
<OVERDIST-NET-GAINS-PRIOR>                                          0
<GROSS-ADVISORY-FEES>                                          34,333
<INTEREST-EXPENSE>                                                  0
<GROSS-EXPENSE>                                                34,624
<AVERAGE-NET-ASSETS>                                           10,224
<PER-SHARE-NAV-BEGIN>                                            9.64
<PER-SHARE-NII>                                                  0.34
<PER-SHARE-GAIN-APPREC>                                         (0.16)
<PER-SHARE-DIVIDEND>                                             0.34
<PER-SHARE-DISTRIBUTIONS>                                        0.00
<RETURNS-OF-CAPITAL>                                             0.00
<PER-SHARE-NAV-END>                                              9.48
<EXPENSE-RATIO>                                                  0.74
[AVG-DEBT-OUTSTANDING]                                              0
[AVG-DEBT-PER-SHARE]                                             0.00


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE ANNUAL
REPORT OF AMERICAN  CENTURY  GOVERNMENT  INCOME  TRUST AND IS  QUALIFIED  IN ITS
ENTIRETY BY REFERENCE TO SUCH REPORT.
</LEGEND>
<CIK> 0000773674
<NAME> AMERICAN CENTURY GOVERNMENT INCOME TRUST
<SERIES>
   <NUMBER> 81
   <NAME> CAPITAL PRESERVATION FUND INVESTOR CLASS

<S>                                           <C>
<PERIOD-TYPE>                                  YEAR
<FISCAL-YEAR-END>                              MAR-31-1999
<PERIOD-END>                                   MAR-31-1999
<INVESTMENTS-AT-COST>                                     3,206,612,185
<INVESTMENTS-AT-VALUE>                                    3,206,612,185
<RECEIVABLES>                                               785,730,015
<ASSETS-OTHER>                                                6,874,313
<OTHER-ITEMS-ASSETS>                                                  0
<TOTAL-ASSETS>                                            3,999,216,513
<PAYABLE-FOR-SECURITIES>                                    670,800,357
<SENIOR-LONG-TERM-DEBT>                                               0
<OTHER-ITEMS-LIABILITIES>                                     3,611,216
<TOTAL-LIABILITIES>                                         674,411,573
<SENIOR-EQUITY>                                                       0
<PAID-IN-CAPITAL-COMMON>                                  3,324,804,940
<SHARES-COMMON-STOCK>                                     3,324,804,940
<SHARES-COMMON-PRIOR>                                     3,144,640,390
<ACCUMULATED-NII-CURRENT>                                             0
<OVERDISTRIBUTION-NII>                                                0
<ACCUMULATED-NET-GAINS>                                               0
<OVERDISTRIBUTION-GAINS>                                              0
<ACCUM-APPREC-OR-DEPREC>                                              0
<NET-ASSETS>                                              3,324,804,940
<DIVIDEND-INCOME>                                                     0
<INTEREST-INCOME>                                           159,797,409
<OTHER-INCOME>                                                        0
<EXPENSES-NET>                                               15,177,913
<NET-INVESTMENT-INCOME>                                     144,619,496
<REALIZED-GAINS-CURRENT>                                      2,730,059
<APPREC-INCREASE-CURRENT>                                             0
<NET-CHANGE-FROM-OPS>                                       147,349,555
<EQUALIZATION>                                                        0
<DISTRIBUTIONS-OF-INCOME>                                   144,619,496
<DISTRIBUTIONS-OF-GAINS>                                      2,673,276
<DISTRIBUTIONS-OTHER>                                                 0
<NUMBER-OF-SHARES-SOLD>                                   2,907,552,494
<NUMBER-OF-SHARES-REDEEMED>                               2,867,779,879
<SHARES-REINVESTED>                                         140,391,935
<NET-CHANGE-IN-ASSETS>                                      180,221,333
<ACCUMULATED-NII-PRIOR>                                               0
<ACCUMULATED-GAINS-PRIOR>                                             0
<OVERDISTRIB-NII-PRIOR>                                               0
<OVERDIST-NET-GAINS-PRIOR>                                            0
<GROSS-ADVISORY-FEES>                                        15,124,623
<INTEREST-EXPENSE>                                                    0
<GROSS-EXPENSE>                                              15,177,913
<AVERAGE-NET-ASSETS>                                      3,195,926,315
<PER-SHARE-NAV-BEGIN>                                              1.00
<PER-SHARE-NII>                                                    0.05
<PER-SHARE-GAIN-APPREC>                                            0.00
<PER-SHARE-DIVIDEND>                                               0.05
<PER-SHARE-DISTRIBUTIONS>                                          0.00
<RETURNS-OF-CAPITAL>                                               0.00
<PER-SHARE-NAV-END>                                                1.00
<EXPENSE-RATIO>                                                    0.48
[AVG-DEBT-OUTSTANDING]                                                0
[AVG-DEBT-PER-SHARE]                                               0.00


</TABLE>


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