SSDI Versus SSI: What Applicants Need To Know
Last updated on December 1, 2025
Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI) benefits both provide financial support to people with disabilities, but they have very different eligibility requirements. Understanding the difference can help you better navigate the application process for either program.
I am attorney Nicholas T. Grillo, and I founded Grillo Law Firm with the goal to provide my clients in Hattiesburg and throughout southern Mississippi with the compassionate, individualized legal guidance they need during some of the most challenging periods of their lives. If you are disabled and contemplating filing for SSDI or SSI benefits, contact my firm for assistance.
What Are The Differences Between SSDI And SSI?
SSDI is an insurance program based on your work history; you must have paid enough into Social Security through past employment to qualify, and your monthly benefit amount is tied to your earnings record. Once approved for SSDI, beneficiaries become eligible for Medicare after a 24-month waiting period and certain qualifying dependents may also be entitled to benefits.
To qualify, you must have enough work credits (typically 30 for most adults, although younger people can qualify for benefits with far fewer credits) and you must prove that your disability onset date was before your date last insured – the point at which your “insured status” expires once you stop working and paying into the system.
SSI, in contrast, is a needs-based program for people with disabilities who have very limited income and resources, regardless of their work history. This includes both adults and children, although it is important to note that some of the income and resources of a disabled person’s spouse or parent may be “deemed” to the applicant. Once approved for benefits, SSI recipients qualify for Medicaid immediately, but there are no additional benefits for their dependents.
How Are SSDI And SSI Benefits Similar?
Both programs have the same definition of what it means to be disabled. To qualify, you must have any combination of mental or physical disabilities that prevents you from working and earning substantial gainful activity. In addition, the condition must have lasted or be expected to last for at least one year (or end in death).
Take The First Step With Your SSDI Or SSI Application Today
Do not let the SSDI or SSI application process intimidate you. Call my firm at 769-447-3647 or fill out the online contact form to talk to a Hattiesburg lawyer who can evaluate your claim, explain the differences between the programs in detail and help you file the correct applications. Consultations are free and there are no fees unless your claim succeeds.