High Quality Content by WIKIPEDIA articles! Social Security Disability Insurance (SSD or SSDI) is a payroll tax-funded, federal insurance program of the United States government. It is managed by the Social Security Administration and is designed to provide income supplements to people who are physically restricted in their ability to be employed because of a notable disability, usually a physical disability. SSD can be supplied on either a temporary or permanent basis, usually directly correlated to whether the person`s disability is temporary or permanent.