CRS Report via FAS – Social Security Administration (SSA): FY2017 Appropriations and Recent Trends, William R. Morton, Analyst in Income Security, October 5, 2016.

“The Social Security Administration (SSA) is responsible for administering a number of federal entitlement programs that provide income support (cash benefits) to qualified individuals. These programs are

• Old-Age, Survivors, and Disability Insurance (OASDI), commonly known as Social Security;
• Supplemental Security Income (SSI) for the Aged, Blind, and Disabled; and
• Special Benefits for Certain World War II Veterans.

In FY2017, SSA’s programs are projected to pay a combined $1 trillion in federal benefits to an estimated 68.4 million individuals. The cost to administer these programs is projected to be about 1.3% of benefit outlays.”