# SSI vs SSDI: 8 key differences

The two programs share the same medical standard (SSA's five-step disability evaluation), but they are otherwise very different in eligibility, funding, benefit amount, health-insurance link (Medicaid for SSI, Medicare after 24 months for SSDI), and family benefits. You can qualify for both at the same time — this is called 'concurrent' benefits.

**Direct answer:** SSI is a needs-based program funded by general tax revenue with strict income and resource limits and no work-credit requirement; SSDI is an insurance program funded by payroll taxes that requires work credits and pays based on your earnings record.

**Direct answer:** SSI is a needs-based program funded by general tax revenue with strict income and resource limits and no work-credit requirement; SSDI is an insurance program funded by payroll taxes that requires work credits and pays based on your earnings record.

## What is the difference between SSI and SSDI?
The two programs share the same medical standard (SSA's five-step disability evaluation), but they are otherwise very different in eligibility, funding, benefit amount, health-insurance link (Medicaid for SSI, Medicare after 24 months for SSDI), and family benefits. You can qualify for both at the same time — this is called 'concurrent' benefits.

## Where does this rule live in SSA's regulations?
SSA publishes the SSI eligibility rules in the SSI Eligibility page on ssa.gov and the annual 2026 SSI figures at ssa.gov/oact/cola/SSI.html. When SSA's public page and this article differ, ssa.gov controls.

## What if I'm not sure I qualify?
Apply anyway. SSA determines eligibility on the facts of your case, and application itself protects the earliest possible filing date. There is no penalty for applying and being denied.

## Sources
- SSA — Understanding SSI Eligibility — https://www.ssa.gov/ssi/text-eligibility-ussi.htm
- SSA — 2026 SSI Federal Payment Amounts — https://www.ssa.gov/oact/cola/SSI.html
- SSA — SSI Spotlights — https://www.ssa.gov/ssi/spotlights/

## Related questions
- [SSI — Supplemental Security Income Complete Guide (2026)](https://ssdidirectanswers.com/ssi)
- [SSI vs SSDI](https://ssdidirectanswers.com/ssi-vs-ssdi)
- [The SSDI Application Process](https://ssdidirectanswers.com/application-process)
- [SSDI Appeals & Reconsideration](https://ssdidirectanswers.com/appeals)
## Topics
- SSI vs SSDI — https://ssdidirectanswers.com/ssi-vs-ssdi

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