SSDI (Social Security Disability)
Monthly benefits for people with disabilities who have work history.
About This Program
SSDI is an insurance program, not a welfare program. The benefits you receive are based on your average lifetime earnings — the same formula used for Social Security retirement — and you qualify by having paid enough into the system through payroll taxes. Most applicants need 40 work credits (roughly 10 years of work) with at least 20 credits earned in the past 10 years. Younger workers need fewer credits. To qualify medically, you must have a physical or mental condition that prevents you from doing substantial work — defined in 2024 as earning more than $1,550 per month — and the condition must have lasted or be expected to last at least 12 months or result in death. The SSA maintains a Listing of Impairments (the "Blue Book") of conditions that automatically qualify if certain severity criteria are met. If your condition is not on the list, SSA evaluates whether you can do any work in the national economy given your age, education, and work history. The application process is long. Initial decisions take 3–6 months, and about 65% of initial applications are denied. Most successful SSDI recipients win at the Administrative Law Judge (ALJ) hearing stage, which can take 1–2 years after a denial. Having medical documentation from treating physicians — not just a diagnosis, but detailed notes on your functional limitations — is the most important factor in a successful claim. After 24 months of SSDI payments, you automatically become eligible for Medicare, regardless of age. There is also a 9-month trial work period during which you can work and test your ability to return to employment without losing benefits.
Eligibility Requirements
| Disability | Qualifying physical or mental disability preventing substantial work |
| Employment | Sufficient work credits (typically 5 of last 10 years) |
Frequently Asked Questions
How is my SSDI benefit amount calculated?
SSDI is based on your Average Indexed Monthly Earnings (AIME) — a calculation of your lifetime Social Security-taxed earnings. The formula produces a Primary Insurance Amount (PIA). The average SSDI payment is about $1,537/month in 2024. Create a My Social Security account at ssa.gov to see your estimated benefit.
Can I receive SSDI and work part-time?
Yes, during a Trial Work Period (TWP) of 9 months, you can earn any amount and still receive full SSDI benefits. After the TWP, you enter a 36-month Extended Period of Eligibility — you receive SSDI in months where your earnings are below the Substantial Gainful Activity (SGA) threshold ($1,550/month in 2024). Report all work activity to SSA.
What happens to my SSDI when I turn 65?
At full retirement age (66-67 depending on birth year), your SSDI converts to Social Security retirement benefits. The payment amount stays the same — you do not receive less. Your Medicare coverage also continues uninterrupted.
How long can I receive SSDI?
SSDI continues as long as you have a qualifying disability and your earnings stay below SGA. SSA periodically conducts Continuing Disability Reviews (CDRs) — typically every 3-7 years — to confirm continued eligibility. For conditions expected to improve, reviews may be every 6-18 months. Stable conditions reviewed less frequently.
When does Medicare start after SSDI approval?
Medicare begins 24 months after the first month you are entitled to SSDI benefits (not 24 months after approval). If there is back pay, your entitlement date may be earlier than your approval date, shortening the wait. In the meantime, apply for Medicaid to cover health costs.
Related Programs
SSI (Supplemental Security Income)
Monthly payments for low-income disabled adults and seniors.
Medicare
Federal health insurance for adults 65+ and some younger disabled individuals.
Ticket to Work (SSA)
Free employment services for Social Security disability recipients who want to work.
SNAP (Food Stamps)
Monthly grocery benefits for low-income households.
Eligibility requirements may have changed. Verify at the official source before applying.
Benefit Amount
Average $1,537/mo; up to $3,627
Application Guide
How to Apply for SSDI (Social Security Disability) →Category
DisabilityLast reviewed: May 2025