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Seeks safety of principal and high current income that is exempt from federal income tax.

/sd/customer/portfolio_json 1.800.345.2021

Data reflects past performance for Investor Class shares, assumes reinvestment of dividends and capital gains and is no guarantee of future results. Current performance may be higher or lower than data shown. Investment return and principal value fluctuates. Redemption value may be more or less than original cost. Obtain performance data current to the most recent month end. For additional share class information, consult the prospectus.

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Average annual total returns illustrate the annual compounded returns that would have produced the cumulative total return if the fund's performance had remained constant throughout the period indicated. Returns for periods less than one year are not annualized.

Expense ratios provided are the funds' total annual operating expense ratios, gross of any fee waivers or expense reimbursements. Expense ratios are as of the funds' most current prospectus.

Returns or yields for the fund would have been lower if a portion of the management fee had not been waived. Review the annual or semi-annual report for the most current information.

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The 7-Day Current Yield more closely reflects the current earnings of the fund than the total return.
The 7-Day Effective Yield can be slightly higher than the 7-Day Current Yield because of the effects of compounding. The 7-Day Effective Yield assumes that income earned from the fund's investments is reinvested and generating additional income.

Calendar Year Returns

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An investment in the fund is neither insured nor guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1 per share, it is possible to lose money by investing in the fund.

Fund shares are not guaranteed by the U.S. Government. Because the fund invests primarily in municipal securities, it will be sensitive to events that affect municipal markets. Investment returns are exempt from Federal taxes.

W2 If your account falls below the minimum balance, you will be notified and given 90 days to meet the minimum. If the deadline is not met, American Century Investments may redeem the shares in the account and send the proceeds to the address of record.

For detailed descriptions of indices or investing terms referenced above, refer to our glossary.

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Quick Facts

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