What SSDI Requires: The Two-Part Test

Social Security Disability Insurance has two separate requirements, and you must meet both. First, you need enough work credits — a measure of how long you have worked and paid Social Security taxes. Second, you need a medical condition that meets Social Security's definition of disability. Neither one alone is enough.

Work credits accumulate as you work. In 2024, you earn one credit for every $1,730 in wages or self-employment income, up to four credits per year. The exact dollar amount changes each year. Most people need 40 credits total, with at least 20 earned in the 10 years before they became disabled — but the requirement is lower if you became disabled before age 31.

The medical part is stricter than many people expect. Social Security does not pay for partial disability, chronic pain alone, or conditions that limit your work but do not prevent it entirely. Your condition must be severe enough that you cannot do any substantial work for at least 12 months, or it must be terminal.

Key Takeaways

  • You need 40 work credits total, with at least 20 earned in the 10 years before you became disabled, unless you were disabled before age 31.
  • Work credits are based on earnings and taxes paid, not on the length of time you worked — someone who worked five years full-time may have enough credits, while someone who worked part-time for 20 years may not.
  • Your medical condition must prevent you from doing any substantial work for at least 12 months; Social Security does not pay for partial disability or conditions that limit but do not eliminate your ability to work.
  • You can check your work credits by creating an account at ssa.gov and viewing your Social Security Statement, which shows credits earned each year.

How to Count Your Own Work Credits

Your Social Security Statement shows exactly how many credits you have earned in each year. To view it, go to ssa.gov, select "Create an account," and sign in. Once logged in, look for "Earnings Record" or "View Your Statement." The page will list your reported earnings year by year and show the credits you earned.

If you worked before 1978, the counting method was different — you earned one credit for every $50 in quarterly earnings, up to four per year. Social Security's records should reflect this automatically, but if you see a gap or believe earnings are missing, you can request a corrected record. Bring W-2 forms or tax returns as proof to your local Social Security office, or mail copies to Social Security with a letter explaining the discrepancy.

For self-employed people, credits are based on net self-employment income reported on Schedule C of your tax return. If you did not file taxes in a year you worked, you may not have credits for that year even if you earned money. This is one reason to keep tax returns — they are the only proof Social Security accepts for self-employment income.

The Medical Definition of Disability

Social Security uses a specific list called the Blue Book to define which conditions can may have access to for SSDI. The list includes conditions like cancer, heart disease, arthritis, mental illness, and neurological disorders — but only when they are severe enough to prevent work entirely.

Your condition does not have to be on the list to may have access to. If it is not listed, Social Security will consider whether it is as severe as a listed condition. This is called "medical equivalence." For example, if you have a condition not on the list but your symptoms are as disabling as a listed condition, you may still may have access to.

Social Security also considers your age, education, and work history when deciding whether you can do other work. A 58-year-old with a high school diploma who has always done manual labor may be found disabled at a lower medical severity level than a 35-year-old with a college degree who has done office work. This is called the "grid rules," and it applies only to people age 50 and older.

When You Became Disabled Matters for Credits

If you became disabled before age 31, you need only 20 work credits, with at least 5 earned in the 3 years before you became disabled. This is a much lower bar than the standard 40 credits.

If you became disabled between ages 31 and 42, you need 20 credits earned in the 10 years ending when you became disabled. The exact number depends on your age at the time of disability — the older you were, the more credits you need, but never more than 40.

If you became disabled at 42 or older, you need the full 40 credits, with at least 20 earned in the 10 years before disability. This is the standard requirement for most applicants.

What Happens If You Do Not Have Enough Credits

If you do not have enough work credits, you cannot receive SSDI, but you may be able to receive Supplemental Security Income (SSI) instead. SSI is a needs-based program that does not require work credits — only that your income and resources fall below certain limits and that you meet the medical definition of disability. The medical standard is the same as SSDI, but the financial rules are different.

You can explore for both SSDI and SSI at the same time. Social Security will evaluate your work credits and tell you which program you may have access to for. If you have some credits but not enough for SSDI, you may still may have access to for SSI if your income is low enough.

If you are close to having enough credits, you might consider whether you can work a bit longer to earn more. Each year of substantial work adds up to four credits. However, this depends on your medical condition and whether working would make it worse. Talk to your doctor before deciding to delay an process.

Documents You Will Need to Prove Work Credits

Social Security has your work history on file if you have a Social Security number and your employer reported your wages. You do not need to bring proof of work credits to explore — Social Security will look them up. However, if you believe your records are incomplete or incorrect, bring documents that show your earnings.

For W-2 employees, bring W-2 forms or tax returns showing the years and amounts you earned. For self-employed people, bring tax returns showing Schedule C (self-employment income) for each year you worked. If you worked before 1978 or in another country, bring any pay stubs, employer letters, or tax records you have.

If you worked "under the table" or for cash and did not report it to Social Security, those years will not count as credits. Social Security can only credit earnings that were reported to the IRS and matched to your Social Security number.

how the process works When You Know Your Credit Status

Once you know you have enough work credits and believe you meet the medical definition of disability, you can explore for SSDI. You can explore online at ssa.gov, by phone at 1-800-772-1213, or in person at your local Social Security office. Online applications usually take 15 to 20 minutes.

When you explore, Social Security will ask about your medical condition, when it started, which doctors have treated you, and whether you have worked since becoming disabled. Have your medical records and doctor contact information ready. Social Security will request your medical records directly from your doctors — you do not need to collect them yourself, though you can provide copies if you have them.

After you explore, Social Security sends your case to a state agency called Disability information Services (DDS). DDS reviews your medical records and decides whether you meet the medical definition of disability. This process usually takes 3 to 6 months. You will receive a written decision in the mail.

Frequently Asked Questions

Can I check my work credits without creating a Social Security account?

You can call Social Security at 1-800-772-1213 and ask about your work credits, but creating an account at ssa.gov is faster and shows you the year-by-year breakdown. You can also visit your local Social Security office and ask to see your earnings record in person.

What if I worked in another country — do those years count?

Work in most countries does not count toward SSDI credits unless you were working for a U.S. employer or a U.S. government agency. Some countries have agreements with Social Security that allow credits to be combined, but this is rare. Ask Social Security directly about your specific situation.

If I do not have enough credits now, can I earn more by working part-time?

Yes, you can earn up to four credits per year by working and earning at least $1,730 per quarter (in 2024). However, if you are already disabled, working may affect your case. Talk to your doctor first, and consider that working while disabled can complicate your process or appeal.

Does my age affect whether I can get SSDI?

Age affects how many work credits you need, but there is no age limit for SSDI itself. People in their 20s, 60s, and 80s can all receive SSDI if they meet the work credit and medical requirements. However, once you reach full retirement age, SSDI converts to regular Social Security retirement benefits at the same payment amount.

What if Social Security says I do not meet the medical definition but I disagree?

You can appeal the decision. You have 60 days from the date on your denial letter to file an appeal. The first step is usually a reconsideration, where a different examiner reviews your case. If you are denied again, you can request a hearing before an administrative law judge. Many people hire a lawyer for the hearing stage.