You must meet Social Security's medical definition of disability, have a work history, and file a claim

Social Security Disability Insurance (SSDI) is not a program you become may be able to access for by meeting income or age thresholds. Instead, Social Security uses three hard requirements: you must have a medical condition that prevents substantial work, you must have worked long enough to build credits in the system, and you must file a claim. The medical bar is high — Social Security denies most first-time claims, and the average wait from filing to a decision is four to six months.

This guide explains what Social Security actually looks for, how the work-credit system works, and what happens when you file. It does not determine whether you meet these requirements — only Social Security can do that after reviewing your medical records and work history.

Key Takeaways

  • Your condition must prevent you from doing substantial work for at least 12 months or result in death; temporary or part-time inability to work does not count.
  • You need 40 work credits total, with at least 20 earned in the 10 years before you became disabled; younger workers need fewer credits.
  • Social Security has a list of conditions that automatically meet the disability standard, but most people must prove their condition prevents work through medical evidence.
  • You can file online at ssa.gov, by phone at 1-800-772-1213, or in person at your local Social Security office; filing early matters because benefits do not go back before you file.
  • If Social Security denies your claim, you can request reconsideration within 60 days, and most people who appeal with a lawyer win on the second or third try.

The medical standard: what "disabled" means to Social Security

Social Security defines disability narrowly. Your condition must prevent you from doing any substantial work — not just your old job, but any job you could reasonably do given your age, education, and work history. "Substantial work" means earning more than a set monthly amount; in 2024, that threshold is $1,550 per month, though the number changes yearly.

The condition must last at least 12 months or be expected to result in death. A broken leg that heals in three months, or depression that improves with medication within a year, will not meet the standard. Social Security also looks at whether you can work part-time or do lighter duties — if you can, even if you earn less than before, the agency may find you not disabled.

Social Security maintains a list called the Blue Book of conditions that automatically meet the disability standard if your medical records show you have them and they are severe enough. These include advanced cancer, end-stage renal disease, ALS, and severe intellectual disability. If your condition is on the list and your records match, Social Security approves the claim faster. If your condition is not on the list, you must submit medical evidence showing how it prevents work.

Work credits: how long you must have worked

SSDI is based on your work history, not need. You earn work credits by paying Social Security taxes through your job. In 2024, you earn one credit for every $1,730 in wages (the amount changes yearly). Most people can earn up to four credits per year.

You need 40 credits total to be insured for SSDI. However, you also need to have earned at least 20 of those credits in the 10 years before you became disabled. If you became disabled at age 28, you might have 40 credits total but only 15 in the past 10 years — you would not meet the requirement. If you became disabled before age 31, you need fewer credits; Social Security has a separate formula for younger workers.

You can check your work history and credits by creating an account at ssa.gov and viewing your Social Security Statement. This statement shows how many credits you have earned and when. If the record is wrong — for example, an employer did not report your wages — you can request a correction, though you usually need pay stubs or tax returns as proof.

How to file your claim

You can file online at ssa.gov by going to the SSDI section and starting an application. You can also call Social Security at 1-800-772-1213 (TTY 1-800-325-0778) to file over the phone, or visit your local Social Security office in person. Filing online is usually fastest if you have your documents ready.

When you file, have these documents available: your birth certificate, proof of citizenship or legal residency, your W-2s or tax returns from the past year, and a list of doctors and hospitals that have treated you. Social Security will request your medical records directly from your providers, but having the list speeds the process. If you are filing based on a condition that developed recently, bring records from the date it started.

The date you file matters. SSDI benefits do not go back before you file, so filing early protects you. There is no penalty for filing and being denied — you can file again if your condition worsens. However, if you wait years after becoming disabled, you lose the months of benefits you could have received.

What happens after you file

After you file, Social Security sends you a notice asking for more information. This is normal and does not mean your claim is weak. You will be asked to describe your typical day, what activities you can and cannot do, and how your condition affects work. Answer these questions in detail — vague answers slow the process.

Social Security then requests your medical records from every doctor, hospital, and mental health provider you listed. This can take weeks. If you have not seen a doctor recently, Social Security may refer you to a doctor they pay to examine you. This examination is free, but it is not your doctor — the examiner works for Social Security and writes a report for the agency.

A disability examiner reviews your medical records, work history, and age to decide whether you meet the disability standard. Most first-time claims are denied. If your claim is denied, you receive a written notice explaining why. You then have 60 days to request reconsideration, which means a different examiner reviews your file. You can submit new medical evidence at this stage.

What to do if Social Security denies your claim

If reconsideration is also denied, you can request a hearing before an Administrative Law Judge (ALJ). This is where most people who eventually win their cases succeed. At a hearing, you can present new medical evidence, have a lawyer or representative speak for you, and answer questions from the judge. The hearing usually happens by video or phone, though you can request an in-person hearing.

Many people hire a disability lawyer at the hearing stage. Lawyers who handle SSDI cases work on contingency, meaning they take payment only if you win. Their fee is capped by law at 25% of your back pay (the money owed from when you became disabled to when benefits start), up to $7,200. If you cannot afford a lawyer, you can ask the judge for a representative — some nonprofits provide free representation.

The average wait for a hearing is one to two years depending on your area. During this time, you can work part-time or do other activities — Social Security will not penalize you for trying to work while your case is pending. If the judge approves your claim, you receive back pay from the date you filed, not from the date you became disabled.

Working while you wait or after you are approved

You can work part-time while your SSDI claim is pending. Social Security will not deny your claim because you are working, as long as you are not earning more than the substantial work threshold ($1,550 per month in 2024). If you earn more than that, Social Security may find you are capable of substantial work and deny the claim.

If your claim is approved, you can continue to work under a program called Impairment Related Work Expenses (IRWE). This program allows you to deduct certain costs related to your disability — for example, medication, therapy, or transportation to medical appointments — from your earnings when Social Security calculates whether you are still disabled. You must report your work and earnings to Social Security each month.

After you have been receiving SSDI for two years, you become may be able to access for Medicare, even if you are under 65. This is automatic — you do not need to file a separate application. Medicare covers hospital care, doctor visits, and prescription drugs, though you pay premiums and copays.

Frequently Asked Questions

Can I file for SSDI if I have never worked?

No. SSDI requires work credits, which you earn by paying Social Security taxes through employment. If you have never worked, you may be able to file for Supplemental Security Income (SSI) instead, which is a needs-based program for people with disabilities who have little income or resources. SSI has different rules and does not require a work history.

What if my condition is not on Social Security's Blue Book?

Most conditions are not on the Blue Book. You can still win by submitting medical evidence showing your condition prevents substantial work. This evidence should include test results, imaging, doctor's notes, and statements from your doctors about your functional limitations. The stronger your medical records, the better your chances.

How far back can SSDI benefits go?

SSDI benefits do not go back before you file your claim. However, if you file within 12 months of becoming disabled, you can receive back pay from the date you became disabled. If you wait longer than 12 months to file, you lose the earlier months. This is why filing as soon as you know you cannot work is important.

Can I work full-time and still receive SSDI?

No. If you are earning more than the substantial work threshold ($1,550 per month in 2024), Social Security will find you are capable of substantial work and either deny your claim or stop your benefits. You can work part-time and use IRWE to deduct disability-related costs, but full-time work at substantial earnings will end your SSDI.

What if I disagree with the doctor Social Security sent me to?

You can submit a statement from your own doctor disagreeing with the Social Security examiner's findings. Social Security weighs evidence from your treating doctors more heavily than evidence from examiners they hire, especially if your doctor has treated you for years. Include detailed medical records from your doctor with your response.