Form N-1A Supplement
Mar. 01, 2026
American Century International Bond Funds Prospectus Supplement Emerging Markets Debt Fund |  | |||||||
Supplement dated August 1, 2026 n Prospectus dated March 1, 2026 | ||||||||
The following replaces the Fees and Expenses tables on page 2 of the prospectus:
Shareholder Fees (fees paid directly from your investment) | |||||||||||||||||||||||||||||
| Investor | I | Y | A | C | R | R5 | R6 | G | |||||||||||||||||||||
| Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) | None | None | None | 4.50% | None | None | None | None | None | ||||||||||||||||||||
| Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original offering price or redemption proceeds when redeemed within one year of purchase) | None | None | None | None¹ | 1.00% | None | None | None | None | ||||||||||||||||||||
| Maximum Annual Account Maintenance Fee (waived if eligible investments total at least $10,000) | $25 | None | None | None | None | None | None | None | None | ||||||||||||||||||||
Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | |||||||||||||||||||||||||||||
| Investor | I | Y | A | C | R | R5 | R6 | G | |||||||||||||||||||||
Management Fee2 | 0.89% | 0.79% | 0.69% | 0.89% | 0.89% | 0.89% | 0.69% | 0.64% | 0.64% | ||||||||||||||||||||
| Distribution and Service (12b-1) Fees | None | None | None | 0.25% | 1.00% | 0.50% | None | None | None | ||||||||||||||||||||
| Other Expenses | 0.03% | 0.03% | 0.03% | 0.03% | 0.03% | 0.03% | 0.03% | 0.03% | 0.03% | ||||||||||||||||||||
| Total Annual Fund Operating Expenses | 0.92% | 0.82% | 0.72% | 1.17% | 1.92% | 1.42% | 0.72% | 0.67% | 0.67% | ||||||||||||||||||||
| Fee Waiver | None | None | None | None | None | None | None | None | 0.64%³ | ||||||||||||||||||||
Total Annual Fund Operating Expenses After Fee Waiver | 0.92% | 0.82% | 0.72% | 1.17% | 1.92% | 1.42% | 0.72% | 0.67% | 0.03% | ||||||||||||||||||||
1 Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of purchase.
2 The management fee has been restated to reflect the decrease in the management fee schedule effective August 1, 2026.
3 The advisor has agreed to waive the G Class’s management fee in its entirety. The advisor expects this waiver to remain in effect permanently and cannot terminate it without the approval of the Board of Trustees.
The following replaces the Example section on page 2 and 3 of the prospectus:
Example
The example below is intended to help you compare the costs of investing in the fund with the costs of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods and that you earn a 5% return each year. The example also assumes that the fund’s operating expenses remain the same, except that it reflects the rate and duration of any fee waivers noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
| 1 year | 3 years | 5 years | 10 years | |||||||||||
| Investor Class | $94 | $294 | $510 | $1,131 | ||||||||||
| I Class | $84 | $262 | $456 | $1,014 | ||||||||||
| Y Class | $74 | $231 | $401 | $895 | ||||||||||
| A Class | $564 | $805 | $1,065 | $1,806 | ||||||||||
| C Class | $195 | $604 | $1,038 | $2,046 | ||||||||||
| R Class | $145 | $450 | $777 | $1,701 | ||||||||||
| R5 Class | $74 | $231 | $401 | $895 | ||||||||||
| R6 Class | $69 | $215 | $374 | $835 | ||||||||||
| G Class | $3 | $10 | $17 | $39 | ||||||||||