SSDI Eligibility: Work Credits
To qualify for SSDI, you must have worked long enough and recently enough to have accumulated sufficient work credits. In 2024, you earn 1 credit per $1,730 in wages, up to 4 credits per year.
| Age When Disabled | Credits Needed | Recent Work Requirement |
|---|---|---|
| Under 24 | 6 credits | Earned in last 3 years |
| 24–30 | 12 credits | Earned in last 6 years |
| 31–42 | 20 credits | Earned in last 10 years |
| 44 | 22 credits | Earned in last 10 years |
| 50 | 28 credits | Earned in last 10 years |
| 60 | 38 credits | Earned in last 10 years |
| 62+ | 40 credits | 20 earned in last 10 years |
The 5-Step Disability Evaluation
SSA uses a sequential 5-step process to determine if you're disabled:
- Are you working? If earning above Substantial Gainful Activity ($1,550/month in 2024 for non-blind), you're not disabled.
- Is your condition severe? Must significantly limit basic work activities for 12+ months or result in death.
- Is it on the Listing of Impairments? If it meets SSA's "Blue Book" criteria, you're automatically approved.
- Can you do your past work? If yes, not disabled.
- Can you do any other work? Considering age, education, and work experience—if yes, not disabled.
SSDI Benefit Amounts (2024)
SSDI payments are based on your Average Indexed Monthly Earnings (AIME)—your lifetime Social Security-taxed earnings, indexed for inflation:
- Average monthly benefit: ~$1,537
- Maximum monthly benefit: $3,822 (for high earners with long work history)
- 5-month waiting period: Benefits don't start until your 6th month of disability
- Back pay: SSA pays retroactive benefits up to 12 months before application date (minus the 5-month wait)
Medicare After 24 Months
SSDI recipients automatically become eligible for Medicare after receiving disability benefits for 24 months. This applies regardless of age—even if you're under 65. The 24-month clock starts from the first month of entitlement (month 6 after onset), not the application date.
SSDI is for workers with a disability who have paid Social Security taxes. SSI is for disabled individuals with very low income and assets, regardless of work history. You can potentially receive both if your SSDI benefit is very low. See our SSI guide for details.