The core difference: how you earned your benefit

SSI (Supplemental Security Income) and SSDI (Social Security Disability Insurance) are two separate programs that both pay people with disabilities, but they work on completely different rules. SSDI is based on your own work history or your parent's work history — you earned it by paying Social Security taxes. SSI is a needs-based program for people with low income and few assets, regardless of work history.

This difference shapes almost everything else: how much money you get, whether you can work, what counts as income, and how long you can receive payments. A person might be denied SSDI because they haven't worked enough, but still receive SSI because their income is low. Or they might receive both at the same time.

Understanding which program you're in — or whether you might may have access to for either — matters because the rules for keeping your benefits are not the same.

Key Takeaways

  • SSDI requires a work history (yours or a parent's); SSI does not and is based on income and assets instead.
  • SSDI payments are usually higher, but SSI includes Medicaid in most states while SSDI requires a separate Medicare enrollment.
  • SSDI allows you to earn more money while working than SSI does before your benefits are reduced.
  • SSI has strict asset limits (usually $2,000 for an individual); SSDI has no asset limit.
  • Both programs require you to report changes in income, living situation, or work status to keep receiving payments.

How work history determines which program you can receive

SSDI is an insurance program. You or a parent paid into Social Security through payroll taxes, and SSDI is the payout when you become disabled before retirement age. The Social Security Administration looks at your work record — how many quarters (three-month periods) you worked and paid taxes — to decide if you have enough credits to receive SSDI. The exact number of credits needed depends on your age when you became disabled, but generally you need between 20 and 40 credits.

SSI has no work requirement at all. You don't need to have worked, and your parents' work history doesn't matter. Instead, SSI looks at whether you have low income and few assets. This is why SSI is sometimes called "welfare for disabled people" — it's a safety net for people with disabilities who have no other income source.

If you became disabled young and never worked, SSDI is not an option for you. SSI might be. If you worked for several years and then became disabled, you likely may have access to for SSDI. If you also have low income and few assets, you might receive both programs at once, though the total payment is usually capped.

Monthly payment amounts and how they're calculated

SSDI payments are based on your own earnings record or your parent's earnings record. The Social Security Administration calculates your "Primary Insurance Amount" (PIA) using your average earnings over your working years. Higher lifetime earnings mean a higher SSDI payment. In 2024, the average SSDI payment is around $1,550 per month, but this varies widely depending on work history.

SSI payments are flat. The federal maximum is $943 per month for an individual in 2024, though many states add their own supplement on top of this. SSI does not increase based on your work history because there is no work history involved. The payment is the same whether you never worked or worked for ten years.

Both programs adjust payments yearly for inflation. If you receive both SSDI and SSI at the same time, your total payment is usually capped at the SSI maximum, meaning the programs don't simply add together.

Asset limits and what counts as your money

SSI has strict asset limits. You can own no more than $2,000 in countable assets as an individual, or $3,000 if you're married. Countable assets include cash, bank accounts, stocks, and vehicles over a certain value. Your home and one vehicle do not count. If your assets exceed the limit, you lose SSI entirely until your assets drop back down.

SSDI has no asset limit. You can own a house, multiple vehicles, savings accounts, or investments without affecting your SSDI payment. This is a major difference for people who have received an inheritance, settlement, or have saved money over time.

Both programs count income differently. SSDI allows you to earn more money from work before your benefits are reduced. SSI counts almost all income — including food, housing help from family, and in-kind support — and reduces your payment dollar-for-dollar once you exceed a small monthly threshold.

Healthcare coverage: Medicare versus Medicaid

SSDI recipients receive Medicare, the federal health insurance program for people over 65 and some disabled people. You automatically get Medicare Part A (hospital insurance) after receiving SSDI for 24 months. You can buy into Medicare Part B (doctor visits) and Part D (prescription drugs), though there is a monthly premium. Some SSDI recipients also may have access to for Medicaid if their income is low enough, depending on their state.

SSI recipients receive Medicaid in most states automatically. Medicaid is state-run health insurance for low-income people. Because SSI is needs-based, most SSI recipients are poor enough to may have access to for Medicaid without a separate application. A few states do not automatically link SSI to Medicaid, so you may need to apply separately.

This healthcare difference matters. Medicaid often covers more services than Medicare, including dental, vision, and long-term care. If you're on SSDI only and have no other income source, you may struggle to afford Medicare premiums and out-of-pocket costs.

Work incentives and how much you can earn

Both programs allow you to work and still receive some benefits, but the rules are different. SSDI has more generous work incentives. You can earn up to $1,550 per month (in 2024) without losing any SSDI payment. After that, your benefit is reduced by $1 for every $2 you earn. You can also use "work incentives" like the Plan to Achieve Self-Support (PASS) to set aside income and assets for a work goal without affecting your benefits.

SSI is stricter. You can earn only $65 per month before your SSI payment starts to reduce. After that, your benefit is reduced by $1 for every $2 you earn. The asset limit also means that money you save from work can quickly disqualify you if you exceed $2,000.

Both programs have a trial work period or other mechanisms to test work without immediately losing benefits, but the details differ. If you're thinking about working, it's worth asking the Social Security Administration about your specific situation before you start, because the rules can be complex and a mistake can cost you months of benefits.

Reporting changes and keeping your benefits

Both programs require you to report changes that might affect your benefits. For SSDI, you must report changes in your medical condition, work status, living situation, and income. For SSI, you must report the same things, plus any changes to your assets, household composition, and in-kind support (like someone giving you food or housing).

SSI requires more frequent reporting because assets and living situation matter so much. If you move in with someone, if someone gives you money, or if your assets change, SSI needs to know. SSDI is less concerned with these details because there are no asset limits and income thresholds are higher.

Both programs can overpay you if you don't report changes, and both can demand repayment. If you receive benefits you weren't may have access to to, the Social Security Administration will ask you to return the money. This can happen even if the overpayment was their error, though you can request a waiver if you can show you weren't at fault.

Frequently Asked Questions

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

Yes. If you have a work history that qualifies you for SSDI but your SSDI payment is very low, you may also receive SSI to bring your total income up to the SSI maximum. Your state must also have an SSI program (all do). The two payments don't simply add together — your total is usually capped at the federal SSI maximum.

If I'm on SSI and I start working, what happens to my benefits?

Your SSI payment will reduce as you earn more money. You can earn $65 per month with no reduction. After that, your benefit drops by $1 for every $2 you earn. If you earn enough, your SSI stops entirely. Money you save from work also counts toward your $2,000 asset limit, so saving can disqualify you.

What if I have a parent who worked but I never did — can I get SSDI?

Yes, if you became disabled before age 22. You can receive SSDI based on your parent's work record, called "disabled adult child" benefits. This is separate from SSI. Your parent does not need to be retired or disabled — you just need to have become disabled before you turned 22.

Does receiving SSI affect my ability to own a home?

Your home does not count toward the $2,000 asset limit for SSI, so you can own a house and still receive SSI. However, if you have a mortgage or property taxes, those are expenses that reduce your countable income. Owning a home is allowed; the asset limit applies to liquid assets like cash and bank accounts.

How do I know which program I'm receiving?

Your Social Security statement or award letter will say either "SSI" or "SSDI" (or both). You can also call Social Security at 1-800-772-1213 or visit your local Social Security office. Knowing which program you're on matters because the rules for work, assets, and reporting are different.