v3.26.1
Form N-1A Supplement - American Century Asset Allocation Portfolio
Dec. 01, 2025
ONE CHOICE 2050 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2040 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2055 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2060 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2065 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2035 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2070 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2030 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%
ONE CHOICE 2045 PORTFOLIO  
Prospectus [Line Items]  
Supplement to Prospectus [Text Block]
Summary Prospectus and Prospectus Supplement

One Choice® 2030 Portfolio n One Choice® 2035 Portfolio
One Choice® 2040 Portfolio n One Choice® 2045 Portfolio
One Choice® 2050 Portfolio n One Choice® 2055 Portfolio
One Choice® 2060 Portfolio n One Choice® 2065 Portfolio
One Choice® 2070 Portfolio
Summary Prospectuses and Prospectus dated December 1, 2025
New ACI Logo.jpg
Supplement dated September 1, 2026

Effective October 1, 2026, the funds’ glide path will be modified to increase the equity allocation in all years up to five years prior to the target date. The equity allocation within the last five years prior to the target date and thereafter will not increase. The funds will follow the glide path shown below:
2026 Glidpath.jpg

In connection with the changes to the glide path, each fund’s neutral mix will be revised as indicated below. The funds will begin transitioning to the new asset class allocations, along with certain adjustments to the underlying funds within each asset class, beginning on or about October 1, 2026 and expect the transitions to be completed by March 31, 2027. The funds may realize capital gains as they reallocate their investments.
Asset
Class
One Choice
In Retirement Portfolio
One Choice
2030 Portfolio
One Choice
2035 Portfolio
One Choice
2040 Portfolio
One Choice
2045 Portfolio
Equity Securities (Stock Funds)45.0%48.0%54.5%62.8%71.5%
U.S. Equity30.8%32.5%36.2%41.0%46.0%
International Equity13.2%14.4%16.9%20.1%23.4%
Real Estate1.0%1.1%1.4%1.7%2.1%
Fixed Income Securities (Bond Funds)44.6%43.4%40.0%34.3%27.4%
Short-Term Investments (Short-Term Funds)10.4%8.6%5.5%3.0%1.1%
Asset
Class
One Choice
2050 Portfolio
One Choice
2055 Portfolio
One Choice
2060 Portfolio
One Choice
2065 Portfolio
One Choice
2070 Portfolio
Equity Securities (Stock Funds)79.5%84.8%88.5%90.0%90.0%
U.S. Equity50.9%54.3%56.7%57.6%57.6%
International Equity26.2%27.9%29.2%29.7%29.7%
Real Estate2.4%2.6%2.6%2.7%2.7%
Fixed Income Securities
(Bond Funds)
20.1%14.9%11.3%9.8%9.8%
Short-Term Investments
(Short-Term Funds)
0.4%0.3%0.2%0.2%0.2%