SSDI vs. SSI: What's the Difference and Which One Applies to You

Social Security Disability Insurance and Supplemental Security Income are both federal disability benefit programs administered by the Social Security Administration. They are frequently confused — and the confusion is understandable, because both provide monthly payments to individuals with disabilities. But they are fundamentally different programs with different eligibility requirements.

Social Security Disability Insurance — SSDI — is an earned benefit. It is funded through payroll taxes, and eligibility depends on your work history. The SSA requires that you have earned a sufficient number of work credits over your working lifetime. Because SSDI is based on your earnings record, your monthly benefit amount is calculated from your lifetime average earnings. There is no income or asset limit to receive SSDI.

Supplemental Security Income — SSI — is a needs-based program. It is funded by general tax revenues, not payroll taxes, and it is available to individuals who are disabled, blind, or aged 65 or older and who have limited income and limited assets. You do not need a work history to qualify for SSI. Because SSI is needs-based, there are strict income and asset limits.

Some people qualify for both programs simultaneously — called concurrent benefits — when they meet the disability and work history requirements for SSDI but their SSDI benefit amount is low enough that they also fall below the SSI income threshold.

For both programs, the medical eligibility standard is the same. You must have a medically determinable impairment that has lasted or is expected to last at least 12 months or result in death, and that prevents you from engaging in substantial gainful activity. The strength of your medical evidence — including a complete RFC assessment — determines whether your claim is approved or denied at the initial level. That is where Northpath Services focuses its work.