SSI and SSDI both pay monthly cash to people with disabilities, but they are funded differently and follow different rules. SSDI is an insurance benefit you earn by working and paying Social Security taxes, while SSI is a needs-based program for people with very little income and savings. In 2027 the maximum federal SSI payment is $1,029 a month for an individual, while an SSDI check depends entirely on your own earnings record.
Key takeaways
- SSDI is based on your work history; SSI is based on financial need and has no work requirement.
- The 2027 federal SSI payment is $1,029 a month for an individual and $1,544 for an eligible couple, up from $994 and $1,491 in 2026.
- SSI has strict resource limits of $2,000 (individual) and $3,000 (couple). SSDI has no limit on savings.
- Both programs get the 3.6% cost-of-living adjustment for 2027.
- You can receive both at once if your SSDI check is small, but each SSDI dollar above $20 lowers your SSI by a dollar.
The core difference in one sentence
Social Security Disability Insurance (SSDI) replaces part of the wages you lost because of a disability, and Supplemental Security Income (SSI) provides a basic income floor for people who are disabled, blind, or age 65 and older and who have very limited money.
That single distinction drives almost everything else. Because SSDI is something you paid for through payroll taxes, it does not care how much money you have in the bank, whether you own a second car, or whether your spouse works. Because SSI is paid for out of general tax revenue and is meant for people in financial need, it looks closely at every source of income and every asset you hold.
Both programs are run by the Social Security Administration and use the same medical definition of disability for adults.
Side-by-side comparison for 2027
| Feature | SSDI | SSI |
|---|---|---|
| Who pays for it | Social Security payroll taxes | General federal tax revenue |
| Work history needed | Yes, enough work credits (one credit = $1,970 of earnings in 2027) | No |
| Who can qualify | Insured workers with a qualifying disability | People who are disabled, blind, or 65+ with low income and resources |
| Monthly amount | Based on your lifetime earnings | Up to $1,029 individual / $1,544 couple (federal) |
| Asset limit | None | $2,000 individual / $3,000 couple |
| Waiting period | 5 full months | No five-month waiting period |
| Health coverage | Medicare after 24 months of SSDI entitlement | Medicaid in most states |
| 2027 work limit (SGA) | $1,770/mo, or $2,950/mo if blind | Earnings reduce the check gradually |
| Usual payment date | 2nd, 3rd or 4th Wednesday by birth date | 1st of the month |
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Use the SSI Payment CalculatorWho qualifies for SSDI
To qualify for SSDI you need two things: a medical condition that meets Social Security's definition of disability, and enough work credits earned through jobs where Social Security tax was withheld. In 2027, you earn one credit for each $1,970 of covered earnings, up to four credits a year. The number of credits you need depends on the age at which you became disabled, and some of that work generally has to be recent.
The disability test is strict. Your condition must be expected to last at least a year or to result in death, and it must keep you from doing substantial work. In 2027, "substantial gainful activity" (SGA) means earning more than $1,770 a month, or $2,950 a month if you are blind.
How much SSDI pays
SSDI is generally equal to your full, unreduced primary insurance amount, the same figure used for retirement benefits at full retirement age. That means it is calculated from your highest years of earnings, using the formula described in our guide to how Social Security benefits are calculated. You can get a rough figure with our SSDI calculator.
The waiting period and Medicare
SSDI does not pay for the first five full months after your disability begins. Medicare follows once you have been entitled to SSDI for 24 months.
Who qualifies for SSI
SSI does not require any work history. Instead, you must be age 65 or older, blind, or disabled, and you must have limited income and limited resources. For 2027, countable resources must be no more than $2,000 for an individual or $3,000 for a couple. Some things are not counted, such as the home you live in and usually one car, but cash, bank accounts and most investments are.
Income is examined just as carefully. Almost any money you receive, including Social Security, pensions and wages, can reduce an SSI payment. The first $20 of most income each month is ignored, and work earnings get a more generous treatment, which we explain step by step in our guide to SSI payment amounts for 2027.
Many states add their own supplement on top of the federal amount, so the total some people receive can be higher than $1,029. Rules and amounts vary widely from state to state.
Can you get SSI and SSDI at the same time?
Yes. This is often called receiving "concurrent" benefits. It happens when someone qualifies for SSDI but their work record produces only a small check, and their income and savings are low enough to qualify for SSI as well.
The rule is simple: SSDI counts as unearned income for SSI. After a $20 exclusion, every remaining dollar of SSDI lowers the SSI payment by one dollar.
Worked example: a small SSDI check
Maria receives $600 a month from SSDI and has no other income. Her SSI is figured like this:
- SSDI income: $600
- Minus the $20 general exclusion: $600 − $20 = $580 countable income
- SSI payment: $1,029 − $580 = $449
Maria's total monthly income is $600 + $449 = $1,049.
Worked example: a larger SSDI check
James receives $900 a month from SSDI. His countable income is $900 − $20 = $880, so his SSI is $1,029 − $880 = $149. His total is also $900 + $149 = $1,049.
Notice the pattern. For a single person living independently with no other income, the combined total settles at $1,049 (the $1,029 federal rate plus the $20 exclusion). Once an SSDI check reaches $1,049 or more, there is no federal SSI payment left. A state supplement may change that picture in some states.
How the 2027 COLA affects each program
Both programs receive the 3.6% cost-of-living adjustment announced for 2027. For SSI, that lifted the federal individual rate from $994 to $1,029 and the couple rate from $1,491 to $1,544. For SSDI, every beneficiary's check rises by roughly 3.6%. Someone who received $1,500 a month in 2026 would see about $1,554 in 2027. You can check your own figure with our COLA calculator.
If you receive both, the SSDI increase partly offsets the SSI increase, so your combined total rises by about the $35 increase in the federal SSI rate rather than by both raises added together.
When each payment arrives
SSI is normally paid on the 1st of the month. When the 1st falls on a weekend or federal holiday, the money arrives on the prior business day. The first SSI payment that includes the 2027 increase is paid on December 31, 2026, because January 1 is a holiday.
SSDI follows the birthday schedule: people born on the 1st to the 10th are paid on the second Wednesday, the 11th to the 20th on the third Wednesday, and the 21st to the 31st on the fourth Wednesday. People who receive both SSDI and SSI get their Social Security payment on the 3rd of the month and their SSI on the 1st. Our full 2027 payment schedule lists every date.
What happens when you reach retirement age or return to work
SSDI does not last forever as a separate benefit. When you reach full retirement age, your SSDI automatically converts to a retirement benefit of the same amount. You do not need to reapply. SSI, by contrast, can continue past 65 for as long as you meet the income and resource rules.
If you try returning to work, the programs again behave differently. SSDI offers a trial work period in which any month you earn more than $1,270 in 2027 counts as a trial month, and you can test your ability to work for nine such months while keeping your full benefit. Our guide to the SSDI trial work period and SGA walks through what comes next. SSI simply recalculates your payment each month, reducing it by about half of your earnings after the exclusions.
Frequently asked questions
Is SSI or SSDI the higher payment?
It depends on your work record. SSI has a fixed federal maximum of $1,029 a month for an individual in 2027. SSDI is based on your own earnings and can be much higher or lower than that. Someone with a long career at good wages will usually receive more from SSDI.
Do savings affect SSDI?
No. SSDI has no asset or resource test. You can own a home, have retirement accounts and keep money in the bank. Only SSI has the $2,000 individual and $3,000 couple resource limits.
Can I get SSI if I never worked?
Yes. SSI does not require work credits. You must be 65 or older, blind, or disabled, and meet the income and resource limits.
Are SSI and SSDI taxable?
SSI is never taxable. SSDI is treated like other Social Security benefits, so part of it can be taxable if your total income is high enough. Most people who rely mainly on SSDI owe no federal tax on it. Our guide on whether Social Security is taxable explains the thresholds.
Can I apply for both programs at once?
Yes. A single disability application can be reviewed for both SSDI and SSI, and the agency will decide which one, or which combination, you qualify for.
Sources
This guide is for general education and is not financial, tax or legal advice. Rules and amounts can change; confirm details with the Social Security Administration, the IRS or Medicare. Spotted an error? Let us know.