SSDI vs SSI on a Social Security disability claim

People use "disability" for both programs. Social Security does not. One is insurance you paid for with work. The other is a needs-based payment.

SSDI

Social Security Disability Insurance is paid from the disability trust fund. You qualify with enough covered work, usually 40 work credits with 20 in the last 10 years, and a condition that meets the adult disability rules. The monthly amount is based on your lifetime covered earnings, not on what you own.

After you have received SSDI for 24 months, Medicare entitlement generally begins. Dependents may also qualify on your record.

There is usually a five-month waiting period after the date Social Security finds your disability began. How long an SSDI application takes explains that clock.

SSI

Supplemental Security Income is paid from general tax revenue, not from Social Security taxes. It is for people with limited income and resources who are 65 or older, blind, or have a qualifying disability. Children can get SSI. You do not need work credits.

The SSI overview also requires that you live in one of the 50 states, the District of Columbia, or the Northern Mariana Islands, and that you are a U.S. citizen or national, or in a qualifying noncitizen class.

In 2026 the federal SSI payment standard is $994 a month for an individual and $1,491 for a couple. The resource limits stay at $2,000 for an individual and $3,000 for a couple. Many states add their own supplement. In most states, SSI also means Medicaid.

SSI is paid on the first of the month.

What is the same

For adults, the medical definition of disability is generally the same in both programs. Social Security administers both. You can file a separate application for each so it can decide both. When both pay, Social Security calls that concurrent.

What is not the same

	SSDI	SSI
Paid from	Disability trust fund	General tax revenue
Work credits	Required	Not required
Income and resources	Do not decide the SSDI amount	Must stay under the SSI limits
Waiting period	Usually five months	First full month after you file or become eligible
Health coverage	Medicare after 24 months of SSDI	Medicaid in most states

The Red Book comparison is the source table for those rows.

Which one to file

If you have recent work, start with SSDI and ask about SSI at the same time if your income and resources are low. If you do not have the credits, SSI is the program that can still pay. What to do when you need to file is the order for the application.

The 2026 earnings and SSI amounts are also in the COLA update.