Disability benefits preparation guide
SSDI vs SSI
A plain-English explanation of the difference between SSDI and SSI and what information may be useful to organize before applying.
Last updated: June 2026
Quick answer
SSDI is generally connected to a person's work history and Social Security work credits. SSI is generally needs-based and looks at income and resources. Both programs may require medical information that shows how a condition affects work and daily life.
Who this page is for
This page is for people who are trying to understand the basic difference between SSDI and SSI before organizing information, applying, appealing, or speaking with an advocate or representative.
Information that may matter for SSDI
- Work history and job titles
- Date you last worked or reduced your hours
- Recent monthly earnings if you are still working
- Past employers and dates worked
- Medical conditions and treatment history
- Examples of how your condition affects work duties and daily life
Information that may matter for SSI
- Medical conditions and treatment history
- Income information
- Resource and household information if requested by SSA
- Living arrangement information
- Daily limitations and support needs
- SSA notices or prior application information
Common mistakes to avoid
- Thinking SSDI and SSI are the same program
- Only gathering medical records and forgetting work or income details
- Not saving SSA notices or application letters
- Guessing at dates instead of writing down approximate timeframes
- Assuming one program applies without checking the information SSA may request
How the free screening can help
The free screening helps organize medical, work, treatment, daily limitation, application status, and state information. It does not decide whether SSDI or SSI applies, but it can help you prepare the information you may need.
Start Free Readiness ScreeningFAQ
What is the main difference between SSDI and SSI?
SSDI is generally based on work history and Social Security work credits. SSI is generally needs-based and looks at income and resources. Both involve disability-related medical rules.
Can someone apply for both SSDI and SSI?
Some people may apply for both, depending on work history, income, and resources. SSA decides how the rules apply.
Do both programs require medical information?
Yes. Medical conditions, treatment, records, symptoms, and limitations may be important for both SSDI and SSI preparation.
Does this page tell me which program I qualify for?
No. This page is for general education only. It does not decide eligibility and does not predict approval.
What should I organize if I am not sure which program applies?
Start with medical records, treatment history, work history, income details, daily limitations, and any SSA notices you have received.
Important: This site is not the Social Security Administration. This page is for general education and preparation only. It is not legal advice and does not make benefit decisions or guarantee any result.