SSA Master Beneficiary Record (MBR) ACS Extract

The SSA's Master Beneficiary Record (MBR) contains the data to administer the Old-Age, Survivors and Disability Insurance (OASDI) Program, and includes entitlement and payment data. The SIPP MBR extract file contains Protected Identification Keys (PIK) that link these records to the respondents in the American Community Survey (ACS) microdata files.