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Supplemental Security Income (SSI) and Social Security Disability Insurance (SSDI) are both federal programs that provide cash payments to people who meet the federal definition of disabled.. But the similarities between the two programs end there. Here are the three main differences between them. SSI Is a Means-Tested Program, SSDI Is an Entitlement Program. Although both SSI and SSDI are administered by the Social Security Administration, the two programs have vastly different financial requirements.
Under the Social Security Act, disability means the inability to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or has lasted or can be expected to last for a continuous period of not less than 12 months..