American Century Brokerage

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American Century
Investments
Fund Profile

INVESTOR CLASS
Tax-Free Money Market Fund

August 1, 2006

THIS PROFILE SUMMARIZES KEY INFORMATION ABOUT THE FUND THAT IS INCLUDED IN THE
FUND'S PROSPECTUS. THE FUND'S PROSPECTUS INCLUDES ADDITIONAL INFORMATION ABOUT
THE FUND, INCLUDING A MORE DETAILED DESCRIPTION OF THE RISKS ASSOCIATED WITH
INVESTING IN THE FUND, THAT YOU MAY WANT TO CONSIDER BEFORE YOU INVEST.

You may obtain the prospectus and other information about the fund at no cost by
calling us at 1-888-345-2071, accessing our Web site or visiting one of our
Investor Centers. See the back cover for additional telephone numbers and our
address.

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Tax-Free Money Market Fund

1. WHAT IS THE FUND'S INVESTMENT OBJECTIVE?

   Tax-Free Money Market seeks safety of principal and high current income that
   is exempt from federal income tax.

2. WHAT IS THE FUND'S INVESTMENT STRATEGY?

   The portfolio managers invest at least 80% of the fund's assets in
   cash-equivalent, high-quality debt securities with interest payments exempt
   from federal income tax. Cities, counties and other municipalities in the 50
   states and U.S. territories usually issue these securities for public
   projects, such as schools and roads.

   The portfolio managers also may buy cash-equivalent, high-quality debt
   securities with interest payments exempt from regular federal income tax,
   but not exempt from the federal alternative minimum tax. Cities, counties
   and other municipalities usually issue these securities (called private
   activity bonds) to fund for-profit private projects, such as hospitals and
   athletic stadiums. No more than 20% of the fund's assets may be invested in
   these securities.

   Additional information about Tax-Free Money Market'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.

3. WHAT ARE THE SIGNIFICANT RISKS OF INVESTING IN THE FUND?

   * An investment in the fund 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 fund seeks to preserve the value of
     your investment at $1.00 per share, it is possible to lose money by
     investing in the fund.

   * Because cash-equivalent securities are among the least risky securities
     available, the interest they pay is among the lowest for interest-paying
     securities. Accordingly, the yield on this fund will likely be lower than
     funds that invest in longer-term or lower-quality securities.

   * Some of the fund's income may be subject to the federal alternative
     minimum tax.

   * Because the fund invests primarily in municipal securities, it will be
     sensitive to events that affect municipal markets. Tax-Free Money Market
     may have a higher level of risk than funds that invest in a larger
     universe of securities.

   * There is no guarantee that all of the fund's income will remain exempt
     from federal or state income taxes. Income from municipal bonds held by a
     fund could be declared taxable because of unfavorable changes in tax laws,
     adverse interpretations by the Internal Revenue Service or state tax
     authorities, or noncompliant conduct of a bond issuer.

   FUND PERFORMANCE

   The following bar chart shows the actual performance of Tax-Free Money
   Market's shares for each of the last 10 calendar years. The bar chart
   indicates the volatility of the fund's historical returns from year to year.
   The bar chart and the performance information below are not intended to
   indicate how the fund will perform in the future. Account fees are not
   reflected in the chart below. If they had been included, returns would be
   lower than those shown.

   Calendar Year-By-Year Returns(1)(2)
   ----------------------------------------------------------------------------
   2005               2.05%
   2004               0.87%
   2003               0.73%
   2002               1.18%
   2001               2.52%
   2000               3.82%
   1999               2.97%
   1998               3.47%
   1997               3.43%
   1996               2.98%
   ----------------------------------------------------------------------------

   (1) From August 1, 1997 to July 31, 1998, all or a portion of the fund's
       management fee was waived. As a result, the fund's returns are higher
       than they would have been had the waiver not been in effect.

   (2) As of June 30, 2006, the end of the most recent calendar quarter,
       Tax-Free Money Market's year-to-date return was 1.44%.

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

                            Highest                Lowest
   ----------------------------------------------------------------------------
   Tax-Free Money Market    1.01% (4Q 2000)        0.14% (3Q 2003)




   The following table shows the average annual total returns of the fund's
   shares for the periods indicated. For current performance information,
   including yields, please call us or access our Web site.

                                    1 YEAR      5 YEARS       10 YEARS(1)
   ----------------------------------------------------------------------------
     AVERAGE ANNUAL TOTAL RETURNS (PERIOD ENDED JUNE 30, 2006)
   ----------------------------------------------------------------------------
        Tax-Free
           Money Market             2.61%       1.44%         2.39%
   ----------------------------------------------------------------------------

        (1) From August 1, 1997, to July 31, 1998, all or a portion of the
            fund's management fee was waived. As a result, the fund's returns
            are higher than they would have been had the waiver not been in effect.

4. WHAT ARE THE FUND'S 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 fund
   * to redeem your shares, other than a $20 fee to redeem by wire

   The following table describes the fees and expenses you may pay if you buy
   and hold shares of the fund.

   SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT)
   ----------------------------------------------------------------------------
        Maximum Account Maintenance Fee                  $25(1)
   ----------------------------------------------------------------------------

        (1) Applies only to investors whose total eligible investments with
            American Century are less than $10,000.

   ----------------------------------------------------------------------------
   ANNUAL FUND OPERATING EXPENSES
   (EXPENSES THAT ARE DEDUCTED FROM FUND ASSETS)
   ----------------------------------------------------------------------------
        Management Fee                               0.49%(1)
        Distribution and Service (12b-1) Fees        None
        Other Expenses                               0.02%(2)
        Total Annual Fund Operating Expenses         0.51%
   ----------------------------------------------------------------------------

        (1) The fund pays the advisor a single, unified management fee for
            arranging all services necessary for the fund to operate. The fee
            shown is based on assets during the fund's most recent fiscal year.
            The fund has a stepped fee schedule. As a result, the fund's unified
            management fee rate generally decreases as fund assets increase and
            increase as fund assets decrease.

        (2) Other expenses include the fees and expenses of the fund's
            independent trustees and their legal counsel, as well as interest
            and portfolio insurance.

        EXAMPLE

           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
   ----------------------------------------------------------------------------
                 $52             $163           $285             $640

           Of course, actual costs may be higher or lower. Use this example to
           compare the costs of investing in other funds.

5. WHO ARE THE FUND'S INVESTMENT ADVISOR AND PORTFOLIO MANAGERS?

   American Century Investment Management, Inc. provides investment advisory
   and management services for the fund. American Century uses teams of
   portfolio managers and analysts working together to manage its mutual funds.
   Identified below are the portfolio managers who lead the team that manages
   Tax-Free Money Market:

   STEVEN M. PERMUT, Senior Vice President and Senior Portfolio Manager, has
   been a member of the team since June 2003. He joined American Century in
   June 1987 and became a portfolio manager in June 1990. He has a bachelor's
   degree in business and geography from State University of New York - Oneonta
   and an MBA in finance from Golden Gate University - San Francisco.

   TODD PARDULA, Vice President and Portfolio Manager, has been a member of the
   team since April 2006. He joined American Century in February 1990 and
   became a portfolio manager in April 1994. He has a bachelor's degree in
   finance from Santa Clara University. He is a CFA charterholder.




6. HOW DO I BUY FUND SHARES?

   American Century Brokerage offers several ways to purchase shares

   * Complete and return a brokerage application along with an investment check
     payable to American Century Brokerage

   * If you already have an American Century Brokerage account, simply contact
     us by writing, calling or accessing our Web site

   * Call us and send your investment by bank wire transfer

   Your initial investment in your brokerage account must be at least $2,500.
   If your account balance falls below this account minimum, your shares may be
   redeemed involuntarily.

7. HOW DO I SELL FUND SHARES?

   The most convenient way for you to sell money market fund shares in your
   brokerage account is to use our CheckWriting feature. If you do not have
   checks, you can call us during business hours or send us a letter requesting
   a redemption check or bank wire. A $20 wire fee will be deducted from your
   redemption to cover bank charges. In addition, we will automatically sell
   sufficient shares in Tax-Free Money Market when you direct us to make other
   investments in your brokerage account.

   Depending on the options you select when you open your account, some
   restrictions may apply. For your protection, some redemption requests may
   require a signature guarantee.

8. HOW ARE FUND DISTRIBUTIONS MADE AND TAXED?

   Dividends are declared and available for redemption daily. Distributions
   will generally be exempt from federal income tax. Some of the fund's income
   may, however, be subject to the federal alternative minimum tax. Consult
   your tax advisor for information about whether you are subject to the
   federal alternative minimum tax. Distributions are reinvested automatically
   in additional shares unless you choose another option.

9. WHAT SERVICES ARE AVAILABLE?

   American Century Brokerage offers several ways to make it easier for you to
   manage your account, such as

   *  telephone transactions
   *  wire and electronic funds transfers
   *  TeleSelect Automated Information and Trading Line transactions
   *  24-hour online account access and transactions

   You will find more information about these choices in our Brokerage
   Information Kit, which you may request by calling us, accessing our Web site
   or visiting one of our Investor Centers.

AMERICAN CENTURY BROKERAGE, INC.
P.O. BOX 419146
KANSAS CITY, MISSOURI 64141-6146

AMERICANCENTURY.COM

BROKERAGE CLIENT RELATIONS ASSOCIATE
1-888-345-2071

FAX
650-967-9627

TELESELECT AUTOMATED INFORMATION
AND TRADING LINE
1-888-345-2091

TELECOMMUNICATIONS DEVICE FOR THE DEAF
1-800-634-4113

SEP-IRA SERVICES
1-800-345-3533, ext. 4210

                                    The American Century Investments logo,
                                    American Century and American Century
                                    Investments are service marks of American
                                    Century Proprietary Holdings, Inc.

BK-PRF-50364   0607                 American Century Investment
                                    Services, Inc., Distributor