SSI and SSDI both pay disability benefits, and both are run by the SSA, but they work very differently and have totally different eligibility rules. Mixing them up is one of the most common mistakes people make when applying. This guide explains the differences clearly and helps you understand which program (or both) might apply to you.
The quick answer
SSDI (Social Security Disability Insurance) is for people who became disabled and have a sufficient work history paying Social Security taxes. SSI (Supplemental Security Income) is for people who are disabled, blind, or 65+ and have very limited income and assets, regardless of work history. SSDI is based on what you paid in; SSI is needs-based. Some people qualify for both at the same time, which is called concurrent benefits.
Side by side comparison
Funding
SSDI is funded by Social Security payroll taxes (FICA). SSI is funded by general U.S. tax revenue, not payroll taxes.
Eligibility
SSDI requires a substantial work history (generally 5 of the last 10 years for adults). SSI requires no work history but has strict income and asset limits.
Disability standard
Both use the same medical standard for adults — a disability preventing substantial work, expected to last 12+ months or result in death. SSI for children uses a slightly different standard based on functional limitations.
Benefit amount
SSDI is based on your past earnings (average around $1,500/month). SSI federal maximum is about $943/month for an individual, often with state supplements.
Health coverage
SSDI recipients become eligible for Medicare after a 24-month waiting period. SSI recipients in Texas are generally automatically eligible for Medicaid.
Asset limits
SSDI has no asset limit. SSI has strict limits (generally under $2,000 for individuals, $3,000 for couples).
Who typically applies for SSDI
SSDI is the right program for adults who became disabled after building a meaningful work history. The classic case: someone who worked for 10-20 years, then developed a serious illness or had an accident that prevents them from continuing to work. Because they paid into Social Security through their job, they qualify for SSDI regardless of how much money they have in the bank or whether they own their home.
SSDI benefits are also generally higher than SSI because they are based on past earnings rather than a fixed federal amount.
Who typically applies for SSI
SSI is the right program for people without enough work history to qualify for SSDI, but who meet the financial limits. The classic cases: young adults who became disabled before working much, elderly people without enough Social Security credits, and children with disabilities in low-income families.
Because SSI is needs-based, it can be lost or reduced if your financial situation changes — receiving an inheritance, marrying someone with assets, or earning above the limits can all affect SSI.
Can you get both? (Concurrent benefits)
Yes, you can sometimes qualify for both SSDI and SSI at the same time, which is called concurrent benefits. This typically happens when your SSDI benefit is low (because you had limited earnings before becoming disabled) and you also meet the SSI financial limits.
When you apply for disability, the SSA automatically evaluates you for both programs. You do not need to choose in advance. If you qualify for both, you receive the SSDI amount plus enough SSI to bring you up to the SSI maximum, and you get both Medicare (after the SSDI waiting period) and Medicaid coverage.
Frequently asked questions
Which program is faster to qualify for?
Decisions on both programs take roughly the same time (3-6 months for the initial decision). SSI sometimes pays first because the 5-month waiting period that applies to SSDI does not apply to SSI.
Can I work while on SSDI or SSI?
You can work small amounts under both programs without losing benefits. There are different rules — SSDI uses the Substantial Gainful Activity threshold (~$1,550/month in 2024), while SSI reduces your benefit gradually as you earn more.
Do SSI recipients automatically get Medicaid?
In Texas, generally yes. In some other states, SSI recipients must separately apply for Medicaid. Texas is a 1634 state, which means SSI eligibility automatically conveys Medicaid eligibility.
Can my children get benefits if I qualify?
Under SSDI, your minor children may qualify for dependent benefits on your record. SSI does not have a dependent benefit, but disabled children can qualify for SSI on their own based on the family's income and resources.