SSDI is an insurance program for workers who have paid Social Security taxes; SSI is a need-based program for people with limited income and assets. Both require the same medical disability standard, but they differ in how you qualify and what you receive — SSDI is based on work history and pays based on past earnings, while SSI is based on financial need and pays a fixed federal benefit rate.
SSDI: Social Security Disability Insurance
- Based on your work history and payroll contributions
- Requires a minimum number of work credits
- No income or asset limits
- Benefits are based on your past earnings
- You become eligible for Medicare after 24 months
SSI: Supplemental Security Income
- Based on financial need, not work history
- Designed for people with limited income and assets
- Strict asset caps: $2,000 for individuals, $3,000 for couples
- Offers Medicaid eligibility immediately in most states
- Monthly payment set by federal guidelines (plus possible state supplements)
Quick Comparison Table
| Feature | SSDI | SSI |
|---|---|---|
| Work History | Required | Not required |
| Income Limits | None for eligibility | Strict income/resource limits |
| Benefit Amount | Based on past earnings | Fixed federal amount |
| Health Coverage | Medicare after 24 months | Medicaid immediately |
Understanding the difference between SSDI and SSI can help you choose the right path—and avoid unnecessary delays.