The Basic Rule: 40 Credits Over Your Lifetime

You need 40 work credits total to become insured for Social Security Disability Insurance (SSDI). You do not need to earn them in any particular order or within a set timeframe — they accumulate over your entire working life. Most people who work full-time for roughly 10 years will have earned 40 credits by the time they reach their mid-30s.

The Social Security Administration (SSA) awards one credit for each $1,550 of earnings in 2024 (this dollar amount changes annually). You can earn a maximum of four credits per year, regardless of how much you earn. This means the fastest possible path to 40 credits is 10 years of work, but the actual timeline depends on when you started working and how consistently you earned.

Key Takeaways

  • You need 40 work credits total, earned at any point in your life, with no time limit for accumulation.
  • You earn one credit for each $1,550 of covered earnings in 2024; the threshold increases slightly each year.
  • You can earn a maximum of four credits per year, so the minimum time to reach 40 credits is 10 years of work.
  • If you became disabled before age 31, you may need fewer than 40 credits — as few as 6 credits if you are under 24.
  • Your work history is verified through your Social Security record, which you can review for free at ssa.gov.

How Credits Accumulate: The Annual Threshold

Each year, SSA sets an earnings threshold. In 2024, you earn one credit for every $1,550 you make from work covered by Social Security. Once you have earned $6,200 in 2024, you have earned your four credits for that year — earning more does not give you additional credits.

The threshold rises most years. In 2023 it was $1,470 per credit; in 2022 it was $1,410. SSA announces the new threshold in October for the following year. If you are self-employed, your net earnings from self-employment count toward credits the same way wages do, though you must report them on your tax return.

Part-time work, seasonal work, and work spread across multiple employers all count. What matters is your total covered earnings for the year, not the source or consistency of that income.

The 20/40 Rule for Younger Workers

If you become disabled before age 31, you do not need 40 credits. Instead, you must have earned 20 credits in the 10-year period ending when your disability began. This is called the 20/40 rule.

For example, if you became disabled at age 28, SSA would look back 10 years to age 18 and count how many credits you earned between age 18 and 28. If you earned at least 20 credits during that decade, you meet the requirement.

If you are under 24 and become disabled, the rule is even more lenient: you need only 6 credits earned in the 3-year period when ready before your disability began. This recognizes that very young workers have had little time to build a work history.

Verifying Your Work Credits on Your Social Security Record

Your work credits are recorded in your Social Security account. You can view your record free of charge by creating an account at ssa.gov and logging into "my Social Security." The record shows your earnings history year by year and displays how many credits you have earned to date.

Errors in your earnings record are common, especially if you changed names, had multiple employers, or worked under a name that did not match your Social Security card. If you spot a discrepancy, you can request a correction by contacting SSA directly. You have a limited window — generally three years, three months, and 15 days after the year in which you earned the income — so check your record regularly.

When you file for SSDI, SSA will pull your official earnings record and verify your credits as part of the review. You do not need to submit proof of work history yourself; SSA has access to your tax records and employer reports.

What Counts as Covered Work

Most jobs in the United States are covered by Social Security, meaning your earnings count toward credits. This includes W-2 employment, self-employment, and work for nonprofit organizations. Federal employees hired after 1983, railroad workers, and some state and local government employees are covered under different systems but still earn Social Security credits.

Work that does not count includes certain government jobs (some state and local positions hired before specific dates), work by nonresident aliens on temporary visas, and informal work paid in cash that was never reported to the IRS. If you worked abroad, credits may or may not count depending on the country and the agreement between that country and the United States.

If you are unsure whether a past job counts, SSA can tell you. Bring your employment records or tax returns to a Social Security office, or call 1-800-772-1213 to ask.

Gaps in Work History and Recent Earnings

SSA does not require continuous work. You can have years with zero earnings and still meet the credit requirement, as long as you have accumulated 40 credits at some point. A person who worked full-time from age 22 to 32, then did not work again, would still have 40 credits and could file for SSDI at any age if they became disabled.

However, SSA does look at your recent work history as part of the overall disability information. If you have not worked in many years and your condition is not clearly disabling, SSA may question whether your condition is truly preventing you from working now. This is a separate question from whether you have enough credits — you can have 40 credits and still be denied SSDI if SSA concludes you are able to work.

Recent earnings also affect your benefit amount. Your SSDI payment is calculated using your average earnings over your working years, with more recent years weighted more heavily. Gaps in work lower your average, which lowers your monthly benefit.

How Your Age Affects the Credit Requirement

The credit requirement depends on your age when you became disabled, not your age when you file. The rules are:

  • Age 31 or older: You need 40 credits total (no time limit).
  • Age 24 to 30: You need 20 credits earned in the 10-year period before disability began.
  • Age 21 to 23: You need 12 credits earned in the 3-year period before disability began.
  • Under age 21: You need 6 credits earned in the 3-year period before disability began.

These rules exist because younger workers have had less time to accumulate credits. A 22-year-old who worked part-time for two years and then became disabled would need only 6 credits, not 40. By contrast, a 35-year-old with the same work history would not meet the requirement.

Frequently Asked Questions

Do I need to have worked recently to get SSDI?

No. You need 40 credits total, but they do not have to be recent. However, SSA will examine your recent work history as part of deciding whether you are truly unable to work. If you have not worked in 15 years and your condition is not obviously disabling, SSA may deny your claim even if you have 40 credits.

What if I worked part-time and only earned 2 credits per year?

You would reach 40 credits in 20 years instead of 10. The timeline depends on your earnings each year, not on how many hours you worked. Once you have earned $1,550 in a year (in 2024), you have one credit for that year, whether you earned it in one month or twelve.

Can I use work credits from another country?

It depends on the country and whether the United States has a totalization agreement with it. Some countries' work credits can be combined with U.S. credits under these agreements. Contact SSA or the foreign country's social security office to find out whether your work counts.

If I am denied SSDI, do I lose my work credits?

No. Your credits remain in your Social Security record permanently. If you are denied and later appeal, or if you reapply years later, your credits are still there. They also count toward retirement benefits if you reach retirement age.

How do I know if my earnings record is correct?

Log into your Social Security account at ssa.gov and review your earnings history. If you see missing years, inflated amounts, or earnings under a name you did not use, contact SSA to request a correction. You have about three years after the year you earned the income to correct errors.