No, they are not the same program, though they both pay people who cannot work

Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI) are two separate programs run by the Social Security Administration. They have different rules about who gets money, how much you receive, and what you must do to keep the payments. The main difference: SSDI is based on your work history; SSI is based on your income and assets right now. You can receive one, the other, or both at the same time.

Understanding which one you might receive matters because the application process is different, the monthly payment amounts are different, and the rules about working while you receive benefits are different. Many people are confused about this because both programs use the same medical criteria to decide if you are disabled — but that is where the similarity ends.

Key Takeaways

  • SSDI requires you to have worked and paid Social Security taxes; SSI does not require work history but limits your income and assets to very low amounts.
  • SSDI payments are based on your past earnings; SSI payments are the same for everyone in your state and are much lower.
  • You can receive both SSDI and SSI at the same time if your SSDI payment is below a certain threshold.
  • Both programs use the same medical definition of disability, but the financial rules are completely different.
  • You apply to both programs through the same Social Security office, but the paperwork and decisions are handled separately.

How SSDI and SSI differ in who can receive them

SSDI is for people who have worked long enough and paid enough Social Security taxes to have earned a "work history." The Social Security Administration looks at your earnings record going back several years. If you stopped working because of a disability, SSDI asks: did you work enough before you became disabled? If yes, you may receive SSDI based on what you earned. The amount you get depends on how much you made while you were working.

SSI is for people with very low income and very few assets, regardless of work history. You can have never worked a day in your life and still receive SSI if you are disabled and meet the income and asset limits. SSI is also available to people over 65 or blind, even if they are not disabled. The program is designed for people with almost no money — in most states, you cannot have more than $2,000 in countable assets to receive SSI, and your monthly income must be below a certain amount that varies by state.

This is why SSI is sometimes called the "safety net" program: it catches people who do not have a work history or whose work history is too short to may have access to for SSDI. A teenager who became disabled before ever working, or someone who worked only a few months years ago, would not may have access to for SSDI but might may have access to for SSI.

Monthly payment amounts: why they are so different

SSDI payments vary widely because they are based on your individual earnings record. Someone who worked for 30 years in a high-paying job will receive a much larger SSDI payment than someone who worked part-time for a few years. The Social Security Administration calculates your payment based on your average earnings over your working life. In 2024, SSDI payments range from around $300 to over $3,800 per month, depending on your work history.

SSI payments are the same for everyone in your state (with small variations for living situation). The federal base amount is the same nationwide, but some states add extra money on top. In 2024, the federal SSI payment is around $943 per month for an individual, though your state may pay more. Because SSI is means-tested — meaning it is only for people with very low income and assets — the payment is intentionally kept low and is not based on what you earned.

If you receive SSDI and your payment is below the SSI federal rate, you may receive both programs at the same time. The SSI program will "top up" your SSDI payment to bring it closer to the SSI level. This is called "concurrent benefits" and is common for people who had very short work histories before becoming disabled.

Work rules and how much you can earn while receiving benefits

Both SSDI and SSI allow you to work and earn some money, but the rules are different. SSDI has a higher earnings threshold: in 2024, you can earn up to around $1,550 per month without losing your SSDI payment. If you earn more than that, your payment is reduced. There is also a nine-month "trial work period" where you can earn any amount without losing benefits — this is designed to let you test whether you can work full-time.

SSI has a much stricter earnings limit. You can earn around $65 per month without any reduction to your SSI payment. After that, SSI reduces your payment by 50 cents for every dollar you earn above that amount. This means if you earn $200 per month, your SSI payment will be reduced by $67.50. Because of this, most SSI recipients do not work, or work very few hours.

The difference reflects the programs' purposes: SSDI is meant to replace lost wages from a job you had, so the program encourages you to try working again. SSI is a poverty program, so it is designed to keep you from earning too much money while still receiving help.

Medical requirements: where SSDI and SSI are the same

Both programs use the exact same medical definition of disability. You must have a condition that prevents you from doing any substantial work and is expected to last at least 12 months or result in death. The Social Security Administration maintains a list of conditions that automatically meet this definition — called the "Blue Book" — but you can also show that your condition is disabling even if it is not on the list.

The medical evidence you need is the same for both programs: medical records, test results, doctor's statements, and information about how your condition affects your daily life and ability to work. If you are denied SSDI because your condition is not considered disabling, you will also be denied SSI for the same reason. If you are approved for one program based on your medical condition, that medical decision carries over to the other program.

The difference is not in the medical part of the decision — it is in the financial part. You could have a condition that clearly meets the disability definition but still be denied SSI because your income or assets are too high, or denied SSDI because you do not have enough work history.

How to apply and what documents you need

You apply to both SSDI and SSI through the same Social Security office or online at ssa.gov. When you apply, you can ask to be considered for both programs at the same time. The Social Security Administration will evaluate you for each program separately, and you may be approved for one, both, or neither.

For both programs, you will need to provide: proof of your Social Security number, birth certificate, medical records related to your condition, a list of doctors and hospitals you have visited, and information about your work history (if any). For SSI, you will also need to provide proof of your income and assets — bank statements, proof of rent or mortgage, utility bills, and information about any money or property you own.

The application process takes time. The Social Security Administration typically makes a decision within three to six months, though some cases take longer if more medical evidence is needed. You can check the status of your application online or by calling your local Social Security office.

What happens if you are approved for one program but not the other

If you are approved for SSDI but denied SSI, you will receive only your SSDI payment. This usually happens when you have enough work history to may have access to for SSDI but your SSDI payment is high enough that you do not meet the SSI income limit. You will not receive any additional SSI money.

If you are approved for SSI but denied SSDI, you will receive only your SSI payment. This usually happens when you do not have enough work history for SSDI but you meet the income and asset limits for SSI. Your SSI payment will be the standard amount for your state.

If you are denied for both programs, you can request a reconsideration within 60 days. During reconsideration, a different Social Security employee will review your case and the medical evidence. If you are denied again, you can request a hearing before an administrative law judge. Many people are approved at the hearing stage after being denied initially.

Frequently Asked Questions

Can I receive SSDI and SSI at the same time?

Yes. If your SSDI payment is below the SSI federal rate for your state, you can receive both. SSI will pay the difference to bring your total payment up to the SSI level. This is called concurrent benefits and is common for people with short work histories.

If I am denied SSDI, can I still get SSI?

Yes. SSDI and SSI are evaluated separately. You could be denied SSDI because you do not have enough work history but still be approved for SSI if your income and assets are low enough. The medical decision may be the same, but the financial rules are different.

What is the income limit for SSI?

In 2024, your monthly income must be below around $943 to receive SSI, though some states allow slightly more. Income limits change each year. For SSDI, there is no income limit — you can have any amount of income and still receive SSDI, though your payment may be reduced if you earn too much from work.

Do I have to be unable to work at all to receive either program?

You must be unable to do any substantial work, which means earning more than around $1,550 per month. You can work part-time or earn small amounts and still receive benefits. SSDI allows higher earnings than SSI before your payment is reduced.

How long does it take to get a decision on my application?

Most decisions take three to six months. If the Social Security Administration needs more medical evidence, it can take longer. You can check your application status online at ssa.gov or call your local Social Security office.