SSI vs SSDI: what's the difference

Key facts

• SSI maximum federal payment in 2026: $994/month for one person, $1,491 for an eligible couple. Any countable income lowers it.
• SSI resource limit: $2,000 for one person, $3,000 for a couple. The home you live in and usually one car don't count.
• SSDI amount depends on the person's work history. There's no resource limit.
• SSDI has a 5-month waiting period after disability starts. Medicare starts 24 months after SSDI payments begin (right away for ALS, and special rules for kidney failure).
• SSI usually comes with Medicaid. In NC you still apply for Medicaid through DSS or ePASS.
• Some people get both ("concurrent") when their SSDI is low.
• SSDI back pay can go up to 12 months before the application date. SSI starts the month after you apply, with no back pay before that.
• Disability means you can't do substantial work (SGA, $1,690/month in 2026, or $2,830 if blind) because of a condition expected to last at least 12 months or result in death.

Who qualifies

• SSDI: worked long enough and recently enough (usually 40 work credits, 20 earned in the last 10 years; fewer for younger workers) and meets the disability rules.
• SSI: age 65 or older, blind, or disabled, with limited income and resources, and a US citizen or certain qualified non-citizen.
• Disabled adult children (disabled before age 22) may get benefits on a parent's record.

Common mistakes to avoid

• Thinking there's no point applying for SSI because they've never worked.
• Giving up after the first denial. Many people win on appeal.
• Missing the 60-day appeal deadline.
• Not reporting income or living changes for SSI, which leads to overpayments.

Official sources

• SSA: SSI federal payment amounts 2026
• SSA: 2026 COLA fact sheet (SGA, TWP)
• SSA: Disability benefits
• SSA: SSI

Last checked October 2026. Amounts and rules change, so confirm with the official source before sharing.