SSI vs SSDI: What's the Difference and Who Qualifies for Each

SSI and SSDI are both Social Security programs, but they work very differently — here's a plain-English explanation of which you may qualify for.

In this guide (4 steps):

1.What is SSDI (Social Security Disability Insurance)
2.What is SSI (Supplemental Security Income)
3.Can you receive both SSI and SSDI at the same time
4.How to apply for SSI or SSDI

What is SSDI (Social Security Disability Insurance)

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SSDI is an insurance program funded by the Social Security taxes that workers pay throughout their careers. To qualify, you must: have worked and paid Social Security taxes for a certain number of years (the exact amount depends on your age when you become disabled), have a medical condition that meets Social Security's definition of disability (expected to last at least 12 months or result in death), and be unable to do any substantial work because of the condition. The monthly benefit amount is based on your lifetime earnings history — people who earned more while working receive higher SSDI payments.

Quick Tip

SSDI recipients automatically receive Medicare after a 24-month waiting period, which begins from when payments start.

What is SSI (Supplemental Security Income)

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SSI is a needs-based program funded by general tax revenue (not Social Security taxes). It provides monthly payments to people who are 65 or older, blind, or have a disability — AND have very limited income and resources. You do not need a work history to qualify for SSI. In 2026, the maximum federal SSI benefit is approximately $943/month for an individual and $1,415 for a couple. Many states add a state supplement on top of the federal amount. SSI recipients usually qualify for Medicaid automatically.

Can you receive both SSI and SSDI at the same time

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Yes — it is possible to receive both. This happens when someone qualifies for SSDI based on their work history but their SSDI payment is lower than the SSI limit. SSA calls this "concurrent benefits." For example, if someone's SSDI payment is $600/month but the SSI maximum is $943, they may receive SSI to make up the difference. SSA automatically determines if you qualify for both when you apply for either program.

How to apply for SSI or SSDI

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Apply at any Social Security Administration office, by calling 1-800-772-1213, or online at ssa.gov/disability. The application asks about your medical conditions, work history, and income. SSDI applications typically include a review by a Disability Determination Services office in your state. Processing times average 3–6 months for an initial decision. If denied, you have the right to appeal — about 45% of initially denied claims are approved on appeal. The National Organization of Social Security Claimants' Representatives (nosscr.org) provides free attorney referrals for disability appeals.

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SSI (Supplemental Security Income) and SSDI (Social Security Disability Insurance) are both programs managed by the Social Security Administration, but they have very different eligibility rules, funding sources, and benefit amounts. Many people confuse them or do not know which one they may qualify for. Understanding the key differences helps you know whether to apply and what to expect.

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