You've heard both terms: SSI and SSDI. You're trying to figure out which one applies to your family. The names sound similar, both come from Social Security, and both provide disability benefits. But they're fundamentally different programs with different eligibility rules, different benefit amounts, and different medical coverage.

This guide breaks down what each program is, who qualifies, and how to determine which one (or both) you should apply for.

What SSI and SSDI Are

Supplemental Security Income (SSI) is a needs-based program for people with disabilities who have limited income and resources. You don't need a work history to qualify. The program is funded by general tax revenue, not Social Security taxes.

Social Security Disability Insurance (SSDI) is an insurance program for people who have worked and paid Social Security taxes. Eligibility depends on your work history, specifically how many work credits you've earned. SSDI is funded by Social Security payroll taxes.

The key difference: SSI is based on financial need. SSDI is based on work history.

SSI Eligibility Requirements

To qualify for SSI, you must meet three criteria:

1. Disability or age requirement

You must be disabled, blind, or age 65 or older. For adults under 65, disability is defined the same way as it is for SSDI: you cannot work due to a medical condition expected to last at least 12 months or result in death.

2. Income limits

Your countable income must fall below the federal benefit rate, which changes annually. For 2026, the federal SSI benefit is $967 per month for an individual and $1,450 for a couple. Not all income counts. Social Security doesn't count the first $20 of most income, the first $65 of earnings, and half of earnings above $65.

3. Resource limits

You cannot have more than $2,000 in countable resources as an individual or $3,000 as a couple. Resources include cash, bank accounts, stocks, and bonds. Your home, one vehicle, and certain personal property are excluded.

SSI is a federal program, but some states add a supplemental payment on top of the federal benefit. The amount varies by state.

SSDI Eligibility Requirements

To qualify for SSDI, you must meet two criteria:

1. Disability requirement

You must have a medical condition that prevents you from working and is expected to last at least 12 months or result in death. The Social Security Administration uses a five-step process to determine disability, starting with whether you're currently working and ending with whether you can do any other type of work.

2. Work credit requirement

You must have earned enough work credits by paying Social Security taxes. In 2026, you earn one credit for each $1,810 in earnings, up to four credits per year. The number of credits you need depends on your age when you become disabled.

Generally, you need 40 credits, 20 of which were earned in the last 10 years ending with the year you became disabled. Younger workers need fewer credits. For example, if you become disabled before age 24, you may need as few as six credits earned in the three years before your disability began.

There are no income or resource limits for SSDI. If you qualify based on work history and disability, your other income or savings don't matter.

Benefit Amounts: What You'll Receive

SSI benefit amounts

The federal maximum is $967 per month for an individual in 2026. If you live in someone else's household and don't pay your share of food and shelter costs, your benefit may be reduced by up to one-third. If you have other income, your SSI benefit is reduced dollar-for-dollar after the first $20.

Some states add a state supplement. California, for example, adds $217.63 for individuals, bringing the total monthly benefit to $1,184.63.

SSDI benefit amounts

Your monthly benefit is based on your lifetime average earnings covered by Social Security. The average SSDI benefit in 2026 is approximately $1,575 per month, but individual amounts vary widely. The maximum SSDI benefit is $4,018 per month.

You can estimate your benefit by creating a my Social Security account at ssa.gov. Your benefit estimate is based on your actual earnings record.

Medicaid vs Medicare: The Medical Coverage Difference

The medical coverage that comes with each program is often more important than the monthly cash benefit, particularly for families managing ongoing care.

SSI and Medicaid

In most states, SSI eligibility automatically qualifies you for Medicaid. Medicaid covers a broad range of services: doctor visits, hospital stays, prescription drugs, therapy, durable medical equipment, and in many states, long-term care. For children with disabilities, Medicaid also covers Early and Periodic Screening, Diagnostic, and Treatment (EPSDT) services, which include any medically necessary service.

Medicaid has no premiums, though some states charge small copays for certain services.

SSDI and Medicare

SSDI recipients become eligible for Medicare after a 24-month waiting period from the date they are determined to be disabled. Medicare has four parts:

• Part A (hospital insurance): Covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no premium.
• Part B (medical insurance): Covers doctor visits, outpatient care, preventive services, and medical equipment. The standard premium in 2026 is $185 per month.
• Part C (Medicare Advantage): An alternative to Original Medicare, offered by private insurers. Combines A, B, and often D.
• Part D: Covers prescription drugs. Plans and premiums vary.

Medicare generally has better provider networks and fewer coverage restrictions than Medicaid, but it also comes with premiums, deductibles, and copays. Medicaid has broader coverage for long-term care and therapy services.

If you qualify for both SSI and SSDI, you may be eligible for both Medicaid and Medicare. This is called "dual eligibility," and Medicaid can help cover Medicare's out-of-pocket costs.

Can You Get Both SSI and SSDI?

Yes. If your SSDI benefit is low enough that your income still falls below SSI limits, you can receive both. Your SSI benefit will be reduced by the amount of your SSDI benefit, but the combination can provide more income than SSDI alone.

Dual eligibility also gives you access to both Medicare and Medicaid, which can significantly reduce your medical costs.

How Work History Affects Eligibility

SSI:

No work history required. This program is designed for people who have never worked or who have very limited work history. It's often the only option for young adults with disabilities who became disabled before they could build a work record.

SSDI:

Work history is the foundation of eligibility. If you haven't worked or haven't worked recently, you won't qualify for SSDI, regardless of your disability.

Childhood disability benefits:

If you became disabled before age 22, you may qualify for SSDI based on a parent's work record. This is called Childhood Disability Benefits (CDB) or, informally, adult child benefits. You don't need your own work history. Your parent must be receiving Social Security retirement or disability benefits, or must have died while insured.

How to Apply

For SSI:

You can apply online at ssa.gov, by phone at 1-800-772-1213, or in person at your local Social Security office. You'll need proof of age, proof of U.S. citizenship or eligible noncitizen status, information about your income and resources, medical records documenting your disability, and information about where you live.

For SSDI:

You can apply online at ssa.gov, by phone, or in person. You'll need:

• Your Social Security number
• Proof of age
• Names, addresses, and phone numbers of doctors, hospitals, and clinics that treated you
• A summary of where you worked in the past 15 years and the type of work you did
• Medical records documenting your disability

Both applications ask detailed questions about your medical condition, your work history, and your daily activities. The process is lengthy and requires thorough documentation.

What Happens After You Apply

Both programs use the same medical review process. Social Security will review your medical records and may ask you to attend a consultative exam. The initial review takes three to five months on average, though timelines vary.

If you're denied, you have 60 days to file an appeal. Most initial applications are denied. Approval rates are higher at the appeal and hearing stages, particularly with representation. You can represent yourself, but many applicants work with a disability attorney or advocate. Representatives typically work on contingency and are paid a percentage of any back pay you're awarded, capped at 25% or $7,200, whichever is less.

When to Apply for Both

If you're unsure which program you qualify for, apply for both. Social Security will determine eligibility based on your work history and financial situation. Applying for both doesn't hurt your chances. It ensures you're considered for all benefits you may qualify for.

If you qualify for both, you'll receive the higher of the two benefit amounts, plus any SSI supplement needed to bring your total income up to the SSI limit.

Which Program Is Right for Your Family?

If you've never worked or have limited work history, SSI is likely your option. If you've worked and paid Social Security taxes for several years, SSDI may provide a higher benefit. If your SSDI benefit is low, you may qualify for both.

The medical coverage difference can be as important as the monthly benefit, particularly if you or your child needs ongoing therapy, medical equipment, or long-term care. SSI brings Medicaid. SSDI brings Medicare. Medicaid's broader service coverage often makes it the more valuable program for families managing complex needs, even if SSDI provides a higher monthly check.

Start by gathering your work history, income records, and medical documentation. If you're unsure where to begin, contact your local Social Security office or a disability advocate who can help you determine which application to file.