Form N-1A Supplement

Feb. 27, 2026

American Funds Mortgage Fund® | AMERICAN FUNDS MORTGAGE FUND

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

Prospectus Supplement   March 1, 2026  

For the most recent summary and statutory prospectuses of the following funds:

American Funds Mortgage Fund® (AFMF)
American High-Income Trust® (AHIT)   Intermediate Bond Fund of America® (IBFA) U.S. Government Securities Fund® (GVT)  

Intermediate Bond Fund of America® | INTERMEDIATE BOND FUND OF AMERICA

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

Prospectus Supplement   March 1, 2026  

For the most recent summary and statutory prospectuses of the following funds:

American Funds Mortgage Fund® (AFMF)
American High-Income Trust® (AHIT)   Intermediate Bond Fund of America® (IBFA) U.S. Government Securities Fund® (GVT)  

American High-Income Trust® | AMERICAN HIGH INCOME TRUST

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

Prospectus Supplement   March 1, 2026  

For the most recent summary and statutory prospectuses of the following funds:

American Funds Mortgage Fund® (AFMF)
American High-Income Trust® (AHIT)   Intermediate Bond Fund of America® (IBFA) U.S. Government Securities Fund® (GVT)  

U.S. Government Securities Fund® | U.S. Government Securities Fund

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

Prospectus Supplement   March 1, 2026  

For the most recent summary and statutory prospectuses of the following funds:

American Funds Mortgage Fund® (AFMF)
American High-Income Trust® (AHIT)   Intermediate Bond Fund of America® (IBFA) U.S. Government Securities Fund® (GVT)