Social Security Disability Insurance (SSDI) provides monthly benefits to people who cannot work due to a serious medical condition. It is not a welfare program — it is an earned benefit funded by the same Social Security taxes that pay for retirement benefits. Qualifying requires both a work history and a disability that meets the SSA’s medical criteria.
SSDI vs. SSI — Two Different Programs
Social Security runs two disability programs that are easy to confuse. SSDI (Social Security Disability Insurance) is based on your work history. You must have earned enough work credits — typically 40 credits, 20 of which were earned in the last 10 years — to qualify. SSI (Supplemental Security Income) is need-based and does not require a work history, but has strict income and asset limits. This page focuses on SSDI.
Work Credit Requirements
Work credits are earned based on your annual earnings. In 2025, you earn one credit for each $1,810 in wages or self-employment income, up to a maximum of four credits per year. The number of credits required to qualify for SSDI depends on your age when you become disabled — younger workers need fewer credits. Most adults need 40 credits, with 20 earned in the last 10 years.
The Five-Step Disability Evaluation
The SSA uses a five-step sequential evaluation to determine whether you qualify for SSDI. An examiner works through each step in order, and you can be approved or denied at any step.
- Step 1 — Are you working? If you are currently working and earning above the Substantial Gainful Activity (SGA) threshold ($1,620/month in 2025), you are not eligible. If not working, the review continues.
- Step 2 — Is your condition severe? Your impairment must significantly limit your ability to do basic work activities — standing, walking, lifting, concentrating, or following instructions. Minor conditions do not qualify.
- Step 3 — Is it on the Listing of Impairments? The SSA maintains a list of conditions severe enough to automatically qualify. If your condition matches a listing, you are approved at this step. If not, the review continues.
- Step 4 — Can you do your past work? If your residual functional capacity (what you can still do) allows you to perform any job you’ve done in the past 15 years, you are denied.
- Step 5 — Can you do any other work? If you cannot do past work, the SSA considers your age, education, and transferable skills to determine whether any other work exists in significant numbers in the national economy. If not, you are approved.
How SSDI Benefits Are Calculated
SSDI uses the same formula as retirement benefits — your benefit is based on your Average Indexed Monthly Earnings (AIME) and Primary Insurance Amount (PIA). The SSA uses your full earnings record up to the time you became disabled, so people who become disabled young may have a relatively shorter work history factored in.
The average SSDI benefit as of 2025 is around $1,580 per month, though amounts vary significantly based on individual earnings history.
Medicare After SSDI
Once approved for SSDI, there is a 24-month waiting period before Medicare coverage begins. During that window, you may need to find coverage through a spouse’s employer plan, Medicaid (if you qualify by income), or the ACA marketplace. After the 24 months, you are automatically enrolled in Medicare Parts A and B, regardless of age.
Applying and Appealing
How to Apply
You can apply for SSDI online at SSA.gov, by phone, or in person at a Social Security office. The application asks for detailed information about your medical conditions, work history, and daily limitations. Gather your medical records, treatment history, doctor contact information, and work history before applying.
Initial Denial Rates
Roughly 60 to 70 percent of initial SSDI applications are denied. This is not unusual and does not mean you should give up. Many people who are ultimately approved are denied at the initial stage. Filing a request for reconsideration promptly after a denial is important — you have 60 days from the denial notice.
The Appeals Process
If denied, you can request reconsideration, then a hearing before an administrative law judge (ALJ), then review by the Appeals Council, and finally federal court. Most successful cases are won at the ALJ hearing stage. Many applicants work with a disability attorney, who typically works on contingency (paid only if you win, capped by law).
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