SSDI vs SSI
SSDI is an insurance program for people with enough work credits, and SSI is a need-based program for people with limited income and resources, whatever their work history. Both use the same medical definition of disability, but eligibility, payments and health coverage rules differ.
Who Qualifies for Each
Direct Answer: SSDI is for workers who have paid enough into Social Security and can no longer work because of a disability expected to last at least 12 months, while SSI is for disabled, blind or elderly people with very limited income and resources.
The medical standard is the same. The difference is the financial test: SSDI looks at your work history and recent work, while SSI looks at your current income and assets, and can apply to children and people who have never worked.
Payments and Health Coverage
SSDI payments are based on your average lifetime earnings, and after 24 months of entitlement you generally qualify for Medicare. SSI pays a federal benefit rate that is reduced by other income and often leads to Medicaid coverage, which is administered by states. Because each program has its own rules, a claimant should ask about how work, other income and marriage affect their benefits.
Applying and Appealing
You can apply for both at the same time, and SSA determines which you qualify for. Denials in either can be appealed through the same four levels, generally within 60 days of the notice.
Frequently Asked Questions
What is the main difference between SSDI and SSI?
Can I get both SSDI and SSI?
Which one gives Medicare?
Do I need work credits for SSI?
Is the disability definition different?
You May Also Be Interested In
Social Security Disability
SSDI and SSI claims and appeals
Read moreSSDI Denial Appeals
The four appeal levels and deadlines
Read moreSocial Security Disability Lawyer Fees
The 25% fee and $9,200 cap
Read moreVeterans Claims
VA disability claims and appeals
Read moreHow Contingency Fees Work
Step-by-step from free consultation to settlement
Read moreWhere this applies: Contingency fee rules are set state by state. Check your own state's rules before acting.
Sources for this page
Every rule stated above is based on the primary sources below. Each link goes to the legislation, court rule or regulator itself so you can check it. Last verified 18 September 2026.
- SSA — Disability benefits
SSA's official guidance on applying for SSDI and SSI, including how to appeal a denial. Denials can be appealed through reconsideration, an administrative law judge hearing, the Appeals Council and federal court.
- 20 C.F.R. § 404.315 (who is entitled to disability benefits)
SSDI requires insured status from sufficient work credits and a disability that has lasted or is expected to last at least 12 months or result in death, with benefits starting after a five-full-calendar-month waiting period.
- 20 C.F.R. § 404.1520 (five-step sequential evaluation of disability)
SSA decides disability claims in five steps: whether you are working at substantial gainful activity; whether you have a severe impairment; whether it meets a listing; whether you can do past relevant work; and whether you can do other work given your age, education and experience.
Who wrote and checked this page
- Written and published by
- Edward & Amaury Solicitors (Edward & Amaury Ltd, company no. 12195443), regulated by the Solicitors Regulation Authority under no. 800525.
- Legal review
- This page has not yet been through independent legal review. It is written from the primary sources listed below, which you can check directly.
- Review dates
- Last reviewed 18 September 2026. Next review due 18 March 2027.
Fee rules change. California’s medical malpractice fee limits changed on 1 January 2023, and the QOCS rules in England and Wales changed on 6 April 2023. If you spot something out of date, tell us — we publish corrections.