The Basic Requirements for SSDI
To receive Social Security Disability Insurance (SSDI) in 2025, you must meet three core requirements: you must have a medical condition that prevents you from working, that condition must be expected to last at least 12 months or result in death, and you must have earned enough work credits through Social Security taxes.
The medical requirement is the one most people think about first. Social Security has a specific list of conditions that automatically meet the severity standard — things like certain cancers, heart disease, and severe mental health disorders. If your condition is not on that list, you will need medical evidence showing it is just as serious and will keep you from working for at least a year.
The work credit requirement is separate from the medical one. You cannot have SSDI without both. Even if you have a severe condition, you need to have worked recently enough and long enough to have earned the credits Social Security requires.
Key Takeaways
- You must have a medical condition expected to last 12 months or longer that prevents substantial work, plus enough work credits earned through recent employment.
- Work credits are based on your earnings history, not on how long you worked — you can earn up to four credits per year, and most people need 40 total credits with 20 earned in the last 10 years.
- Social Security has a list of conditions that automatically meet the medical standard, but conditions not on the list can still may have access to if medical evidence shows they are equally severe.
- Your age affects how many work credits you need — younger workers need fewer credits than older workers, but everyone must have earned credits recently.
- The rules about what counts as work and what counts as earnings have not changed for 2025, though the dollar amounts that trigger certain rules are adjusted annually.
How Work Credits Are Counted
A work credit is earned when you pay Social Security taxes on your wages or self-employment income. In 2025, you earn one credit for every $1,550 of earnings, up to a maximum of four credits per year. This means you need $6,200 in earnings in a year to earn the full four credits for that year.
The amount changes each year based on the national average wage. What matters is that you earned the income and paid taxes on it — the work does not have to be recent, but the credits themselves do not expire. A credit you earned in 2010 still counts toward your total in 2025.
Most people who receive SSDI need 40 total work credits, with at least 20 of those earned in the 10 years before they become disabled. If you become disabled before age 24, you need fewer credits. If you become disabled between ages 24 and 31, you need credits for half the years between age 21 and the year you became disabled.
Medical Conditions That Automatically may have access to
Social Security maintains a list called the Blue Book that describes medical conditions meeting the severity standard. These include advanced cancers, heart failure, severe arthritis, advanced Parkinson's disease, severe mental health disorders, and many others. If your condition is on the list and your medical records match the description, Social Security can approve your case faster.
Being on the Blue Book list does not mean automatic approval — your medical records still have to show you meet the specific criteria. But it does mean Social Security has already decided what level of severity is required, so you do not have to prove your condition is as serious as something else.
The Blue Book is updated regularly and is available on the Social Security website. You can search by condition name or body system to see whether your diagnosis appears and what medical evidence Social Security will be looking for.
What Counts as "Unable to Work"
Social Security does not straightforward ask whether you can do your old job. It asks whether you can do any substantial gainful activity — meaning any work that produces significant income. In 2025, substantial gainful activity is defined as earning more than $1,550 per month (or $2,590 if you are blind).
This means if you are working and earning more than that amount, Social Security will assume you are not disabled, regardless of your medical condition. If you earn less than that amount, Social Security will look at whether the work is actually substantial — whether you are working full-time, whether you need help, and whether the income is real or subsidized.
The inability to work must be based on your medical condition, not on other factors like age, lack of jobs, or difficulty finding an employer willing to hire you. Social Security will consider your age, education, and work history when deciding whether your condition prevents you from doing other work you might be trained for, but the condition itself must be the reason you cannot work.
Recent Work History Requirements
Having 40 work credits is not enough by itself. You also need to have earned credits recently. For most people, this means at least 20 of your 40 credits must have been earned in the 10-year period before you became disabled.
If you stopped working five years ago and have not worked since, you may not have enough recent credits even if you have 40 total. Social Security looks at when you earned the credits, not just how many you have.
The recent work requirement is stricter for younger workers. If you become disabled before age 24, you need only one and a half years of work in the three-year period before you became disabled. If you are between 24 and 31, the requirement scales up. By age 31, you need the standard 20 credits in 10 years.
How Social Security Verifies Your Work History
You do not have to prove your work history yourself. Social Security has records of your earnings and work credits based on the taxes you and your employers paid. When you file for SSDI, Social Security will pull your earnings record and count your credits automatically.
You should review your own Social Security earnings record before you file to make sure it is accurate. You can create a my Social Security account at ssa.gov and view your record for free. If there are errors — missing years of work, incorrect earnings amounts, or employers listed wrong — you should report them to Social Security before filing. Correcting errors after you file takes longer.
If you were self-employed, Social Security will look at your tax returns to verify your earnings and the taxes you paid. If you worked under the table or did not report income, those years will not count toward your credits.
Age and Work Credit Requirements
| Your Age When Disabled | Total Credits Needed | Recent Credits Needed |
|---|---|---|
| Before age 24 | 6 credits | 1.5 years of work in the last 3 years |
| Age 24–30 | Credits for half the years from age 21 to disability | Credits for half the years from age 21 to disability |
| Age 31 or older | 40 credits | 20 credits in the last 10 years |
The younger you are when you become disabled, the fewer credits you need because you have had less time to work. But you still need to show recent work — Social Security does not count credits you earned years ago if you have not worked recently.
Frequently Asked Questions
Do I lose my work credits if I have not worked for a few years?
No, work credits do not expire. A credit you earned in 2015 still counts in 2025. However, you do need to have earned credits recently enough to meet the "recent work" requirement — usually 20 credits in the last 10 years if you are over 31. Recent work is separate from total credits.
What if I worked but did not pay Social Security taxes?
Work that was not covered by Social Security taxes does not count toward your credits. This includes some government jobs, certain religious organization employees, and work done under the table. Only earnings on which you and your employer paid Social Security taxes count.
Can I get SSDI if my condition is not on the Blue Book?
Yes. The Blue Book lists conditions that automatically meet the severity standard, but other conditions can may have access to if your medical evidence shows your condition is equally severe and will prevent work for at least 12 months. Social Security will review your medical records to make this information.
Does working part-time while disabled disqualify me?
Not automatically. If you earn less than $1,550 per month in 2025, Social Security will look at whether the work is substantial. Many people on SSDI do work part-time or in limited capacities. Earning above the substantial gainful activity amount will generally result in a finding that you are not disabled.
What happens if I do not have enough work credits?
If you do not have enough work credits for SSDI, you may be able to receive Supplemental Security Income (SSI) instead, which is a needs-based program that does not require work credits. SSI has different rules and income limits. You can file for both SSDI and SSI at the same time.