The Social Security Trust Funds are the Old-Age and Survivors Insurance (OASI) Trust Fund and the Disability Insurance (DI) Trust Fund. The OASI Trust Fund began in 1937; the DI Trust Fund in 1957. These trust funds are managed by the Department of the Treasury

Trust fund tables
• Calendar year data
• OASI Trust Fund, 1937 and later
• DI Trust Fund, 1957 and later
• OASI and DI Trust Funds, combined, 1957 and later
• Fiscal year data, OASI and DI Trust Funds, combined, 1977 and later