Social Security disability (SSDI and SSI): how it works, how to apply, what it pays

Social Security disability benefits come in two forms. Social Security Disability Insurance (SSDI) is paid to workers who have enough work credits and become unable to work due to a qualifying medical condition. Supplemental Security Income (SSI) is a needs-based program for disabled people, adults and children, with limited income and resources, regardless of work history. The two programs are often confused because they share an application process and use the same definition of disability, but they are funded differently and have different eligibility rules.

This section explains how the disability programs work, what "disabled" means for Social Security purposes, how the application process unfolds, and what to expect during appeals if your initial claim is denied.

SSDI vs SSI, the practical differences

The table below shows the most important differences between the two programs. If you're unsure which one applies to your situation, the SSA application process will evaluate you for both at the same time.

SSDI vs SSI comparison

Feature	SSDI	SSI
Funded by	FICA payroll taxes (Social Security trust fund)	General federal revenue
Eligibility basis	Work credits earned through prior employment	Financial need (limited income and resources)
Work history required	Yes, typically 40 credits, 20 earned in the last 10 years	No
Monthly benefit	Based on your earnings record (like retirement)	Federal max $967 for an individual in 2025
Resource limit	No	$2,000 individual / $3,000 couple
Medicare eligibility	Yes, after 24 months of SSDI	No (but usually qualifies for Medicaid)
Family benefits	Yes, spouse and children may qualify	No

How to apply for Social Security disability

The fastest way to start an application is online at ssa.gov/applyfordisability. You can also start over the phone at 1-800-772-1213 or in person at a Social Security field office. SSA needs two main sets of information: a list of your medical treatment (doctors, clinics, hospitals, medications, dates) and a work history going back 15 years.

What SSA looks at during a disability claim

1. Are you working? If you are earning above substantial gainful activity, $1,620 per month in 2025 for non-blind applicants, you generally don't qualify.
2. Is your condition severe? It must significantly limit your ability to do basic work activities for at least 12 months.
3. Is it on SSA's Listing of Impairments? SSA maintains a regulatory document called the Blue Book of disability listings, organised by body system. Meeting one of the listings is the cleanest way to get approved because the claim is decided at step 3 without past-work or labor-market analysis.
4. Can you do the work you did before? If yes, the claim is denied.
5. Can you do any other work? SSA considers your age, education, skills, and limitations to decide whether you could transition to a different job.

The initial decision typically takes 6–8 months. If your claim is denied, you have the right to appeal, and most eventual approvals happen after an appeal, not on the first attempt.

The Social Security disability appeals process

There are four levels of appeal:

1. Reconsideration. A different examiner at your state Disability Determination Services office reviews your claim. You have 60 days to request it after a denial.
2. Hearing before an administrative law judge (ALJ). If reconsideration is also denied, you can request a hearing. This is the step where many claims get approved. Wait times vary by hearing office, but a year or longer is common.
3. Appeals Council review. If the ALJ denies your claim, you can ask the Appeals Council to review the decision.
4. Federal court. The final step is filing a civil action in U.S. District Court.

At every level, you have the right to representation, a disability attorney or advocate who only gets paid if your claim succeeds. SSA caps attorney fees in disability cases, so there's no upfront cost.

Work credits for Social Security disability

SSDI requires work credits earned through employment covered by Social Security. For 2025, you earn one credit for each $1,810 in earnings, up to four credits per year. Most applicants need 40 credits total, with at least 20 earned in the 10 years before becoming disabled. Younger workers need fewer credits, the exact number depends on how old you were when your disability started.

After you're approved for disability benefits

• Waiting period. SSDI has a five-month waiting period before benefits start. SSI benefits begin the first full month after your application is filed.
• Back pay. If your application took months to approve, you may receive back pay covering the time between your disability onset date (minus the waiting period) and your approval date.
• Medicare. SSDI recipients become eligible for Medicare after 24 months. SSI recipients typically qualify for Medicaid immediately.
• Continuing review. SSA reviews disability cases periodically to decide whether you still qualify. Reviews range from every 18 months to every 7 years depending on your condition.
• Work incentives. Programs like Trial Work Period and Ticket to Work let you test going back to work without immediately losing benefits.