SSI and SSDI are different programs with different rules, even though both come from Social Security

SSI (Supplemental Security Income) and SSDI (Social Security Disability Insurance) are not the same. Both are run by Social Security, both require you to have a disability, and both pay monthly cash — but the rules for who gets in, how much you receive, and what you can own are completely different. The biggest difference: SSDI is based on your work history; SSI is based on your income and assets right now.

If you worked and paid Social Security taxes before you became disabled, SSDI is likely your path. If you have little or no work history, or if your work history doesn't add up to what SSDI requires, SSI may be what you can get. Some people get both at the same time, though that is less common.

Key Takeaways

  • SSDI requires you to have worked and paid Social Security taxes; SSI does not care about work history at all.
  • SSDI monthly payments are based on what you earned; SSI payments are the same for everyone in your state and depend on whether you have other income.
  • SSI has strict limits on how much money and property you can own; SSDI has no asset limit.
  • You can work and earn money while on SSDI without losing benefits; SSI has much tighter rules about work and earnings.
  • Both programs require the same medical proof that you have a disability that will last at least 12 months or result in death.

How work history changes everything

SSDI asks: Did you work long enough and recently enough? You need what Social Security calls work credits — you earn these by paying Social Security taxes on your wages. Most people need 40 credits total, and at least 20 of those credits earned in the 10 years before you became disabled. If you are under 31, the rules are looser. If you do not have enough credits, SSDI will turn you down, even if your disability is severe.

SSI asks: How much money do you have right now, and what is your income this month? There is no work history requirement at all. You can have never worked, worked part-time for two months, or worked for 30 years — it does not matter. SSI only cares whether you are disabled and whether you have the money to live on. This is why SSI is often the only option for people who became disabled before they could build a work history, or for people whose work history is too short.

Asset and income limits that work differently

SSI has a resource limit — you cannot own more than $2,000 in countable assets (or $3,000 if you are married). This includes savings, checking accounts, stocks, and most property. Your home and one car do not count. If you go over the limit, you lose SSI entirely until you spend down to the limit again.

SSDI has no resource limit at all. You can own a house, multiple cars, savings accounts, investment accounts — as much as you want. Social Security will not count it against you.

Both programs count income, but differently. SSI subtracts income dollar-for-dollar from your payment (after a small monthly exclusion). If you earn $100, your SSI payment drops by roughly $100. SSDI has Substantial Gainful Activity (SGA) rules — if you earn above a certain monthly amount (currently around $1,550 for non-blind adults, though this changes yearly), Social Security may decide you are not disabled anymore and stop your benefits. But if you stay under SGA, you can earn money without losing SSDI.

Monthly payment amounts

SSDI payments vary widely because they are based on your earnings record. Someone who worked for 40 years at high wages gets more than someone who worked part-time. The average SSDI payment is around $1,500 monthly, but it can be much higher or lower depending on your work history.

SSI payments are the same for everyone in your state (they vary slightly by state). The federal base amount is currently $943 monthly for an individual, though some states add extra money on top. If you have other income — from a job, a pension, or family support — your SSI payment shrinks or disappears.

Medical requirements are the same

Both programs use the same definition of disability: you have a medical condition that prevents you from working, and that condition will last at least 12 months or will result in death. Social Security uses the same doctors, the same medical evidence rules, and the same list of conditions that automatically may have access to (called the Blue Book) for both programs.

The difference is not in the medical bar — it is in what happens after you prove you are disabled. With SSDI, you have proven your work history, so you move forward. With SSI, Social Security also checks your bank account and your income.

What happens if you do not have enough work credits for SSDI

If you do not meet SSDI's work history requirement, you can still file for SSI. You will need to show that you are disabled and that your income and assets are below the limits. SSI does not care that you did not work — it only cares that you cannot work now and that you do not have money to live on.

Some people file for both at the same time. Social Security will evaluate you for SSDI first. If you do not have enough credits, they will automatically consider you for SSI using the same medical evidence. This is called a concurrent claim, and it is the standard way to handle it.

How to find out which one you might get

Call Social Security at 1-800-772-1213 (TTY 1-800-325-0778) and tell them you are disabled and want to know whether you have enough work credits for SSDI. They can pull your earnings record and tell you in one call. If you do not have enough credits, ask about SSI and what your income and asset limits would be.

You can also create an account at ssa.gov and view your earnings record yourself under "My Social Security." This shows you exactly how many credits you have earned and when. Bring this information when you file, or use it to decide whether to file at all.

Frequently Asked Questions

Can I get both SSI and SSDI at the same time?

Yes, though it is uncommon. This happens when your SSDI payment is very small (because your work history was short) and your income is low enough that you still may have access to for SSI. Social Security will pay you SSDI first, then add SSI on top to bring you up to the SSI federal rate. You have to meet the rules for both programs.

If I get SSDI, can I work and earn money?

Yes, as long as you stay under the Substantial Gainful Activity limit (currently around $1,550 monthly). You can earn more than that during a trial work period, and Social Security has other work incentives that let you test your ability to work without losing benefits when ready. SSI has much stricter work rules — any earnings reduce your payment dollar-for-dollar.

What if I worked for only a few years — can I get SSDI?

It depends on your age and how recently you worked. If you are under 31, you may need only 20 credits earned in the three years before you became disabled. If you are older, you need more credits and they have to be more recent. Call Social Security to check your specific record.

Does SSI count my spouse's income?

Yes. If you are married and living together, Social Security counts your spouse's income and assets toward your SSI limit, even if your spouse is not on SSI. This is called "deeming." SSDI does not have this rule — your spouse's income does not affect your SSDI payment.

What counts as a countable asset for SSI?

Cash, savings accounts, checking accounts, stocks, bonds, and vehicles beyond one car all count. Your home and one vehicle do not. Personal items like furniture and clothing do not count. Burial accounts up to $1,500 per person do not count. If you are unsure whether something counts, ask Social Security before you receive it or buy it.