Definitions and special terms
- SSDI (Social Security Disability Insurance)
A Social Security Administration program of cash payments paid to people with documented disabilities. SSDI recipients have a work history and have thus paid into the program through payroll taxes. Some people receive SSDI and SSI (see below) at the same time.
- SSI (Supplemental Security Income)
A means-tested cash payment program for people with disabilities that is based strictly on need, not on work history. Some people qualify for both SSI and SSDI.