HUD Handbook 4350.3 § 9-4

The EIV system is a web-based application which provides owners with employment,
         wage, unemployment compensation and Social Security benefit information for tenants
         participating in HUD’s assisted housing programs. Information in EIV is derived from
         computer matching programs initiated by HUD with the Social Security Administration
         (SSA) and the U.S. Department of Health and Human Services (HHS), for all tenants
         with valid personal identifying information (name, date of birth (DOB), and Social
         Security number (SSN)) reported on the form HUD-50059. Information in the EIV
         system is used by owners to verify employment and income at the time of recertification
         and to reduce errors in subsidy payments.