How Many Work Credits Do You Need for SSDI by Age?

To qualify for SSDI you must pass two work tests, and the number of credits each one requires depends on your age when you became disabled. The duration test asks how much you have worked in total; the recent work test asks whether enough of it was recent. At 31 or older, the recent work test means 20 credits in the 10 years before your disability began, and the total you need rises from 20 credits at age 42 to 40 credits at 62. Younger workers need far fewer.

In 2026 you earn one credit for each $1,890 of wages or net self-employment income, up to four credits for $7,560 in the year. In 2027 it takes $1,970 per credit, or $7,880 for four. Credits never expire, but the recent work test means they stop protecting you a few years after you stop working, which is why people with 40 or more credits are sometimes told they are not insured for disability.

How credits are earned

Credits are based on your total covered earnings for the year, not on when in the year you earned them. Earning $7,560 by March gives you all four credits for 2026 even if you stop working afterward, and you can never earn more than four in a year. The dollar amount per credit rises slightly every year with average wages.

Self-employed people earn credits the same way, on their net earnings after business expenses, and special rules apply when net earnings for the year are under $400. Military service earns credits like civilian work, with extra earnings credits for some service before 2002. Work that did not pay Social Security tax earns no credits, including most federal jobs held by people hired before 1984, railroad work after 10 years of service, and jobs with some state and local governments. Domestic work, farm work and work for certain religious organizations have their own rules.

Extra credits beyond what you need do not increase your benefit. Your SSDI amount comes from your average lifetime earnings.

The two tests

The duration test measures your total work. In general, you take the year you became disabled and subtract the year you turned 22; the result is the number of credits you need, with a minimum of six. Someone disabled at 50 needs 28 credits, and the credits can come from any point in their working life.

The recent work test measures how recently you worked, and it changes with age:

• Disabled in or before the quarter you turn 24: 6 credits in the three years ending when your disability began.
• Disabled from the quarter after you turn 24 until the quarter you turn 31: credits for half the time between age 21 and the start of your disability. Disabled at 27, for example, you need 12 credits out of those six years.
• Disabled at 31 or older: 20 credits in the 10 years ending with the quarter your disability began, often called the 20/40 rule because it is 20 credits out of 40 calendar quarters.

You must pass both. A 50-year-old needs 28 credits in total, and 20 of them must fall within the last 10 years. People who are statutorily blind only have to pass the duration test.

Credits needed at each age

This table combines both tests for people disabled at 31 or older, from Social Security’s own figures:

Under 31, the total requirement is lower, about 1.5 years of work if you are disabled before 28 and 2 years at 30, and the recent work test above is usually the harder one to meet. Social Security applies these rules by calendar quarter, so the exact count can differ by a credit or two from the table depending on your birthday and the quarter your disability began.

Why 40 credits is not always enough

Forty credits is the number for retirement benefits. For disability, the recent work test matters just as much, and it is the reason long-time workers are sometimes denied for “non-medical” reasons. Someone who worked 30 years and then stopped can have far more than 40 credits and still not be insured, if their disability began after they no longer had 20 credits in the last 10 years.

In practice, if you worked steadily and then stopped, you stay insured for roughly five years after your last year of work. The last day you are insured is called your date last insured. Your disability must have begun on or before that date, although you can apply later. This is why waiting years to apply, or starting over with new applications instead of appealing a denial, can cost people their eligibility: the onset date the agency finds may fall after insured status ran out. Appealing a denial keeps your original application, and its date, alive.

Watch out: If you have been out of work for a while because of your condition, apply as soon as you can. Each year that passes moves the 10-year window forward and can drop older credits out of it.

Special rules that help some people

People who were disabled before 31 and qualified under the younger worker rule, then became disabled again at 31 or older, can use the half-the-time rule again, up to a maximum of 20 credits out of 40 quarters. And if you had an earlier period of disability, those quarters are left out of the 40-quarter count, so time spent on disability does not count against you when you become disabled again.

If you do not have enough credits

Not having enough credits of your own does not rule out every benefit. Supplemental Security Income requires no work history at all, only limited income and savings. An adult who became disabled before 22 can receive benefits on a parent’s record once the parent receives retirement or disability benefits or has died, without any credits of their own. A widow or widower between 50 and 59 who is disabled can qualify on a deceased spouse’s record.

How to check your credits

Your Social Security Statement, available in your my Social Security account, shows the earnings Social Security has recorded for each year along with your benefit estimates, including disability. Check each year against your W-2s or tax returns. A missing year of earnings means missing credits, and correcting it before you apply can change whether you qualify for SSDI.