SSDI or SSI? How Social Security's Two Disability Programs Differ

What are Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI)?

The Social Security Administration (SSA) manages two main programs that provide benefits based on disability or blindness. These are Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI).

SSDI provides benefits to people who have developed a disability or who are blind. To qualify, you must be “insured” by workers’ payments to the Social Security trust fund. These payments come from your earnings or those of your spouse or parents, as required by the Federal Insurance Contributions Act (FICA). Your family members, such as dependents, may also be able to get benefits from your work record. (Source: Social Security Administration, The Red Book)

SSI makes cash payments to people who are aged, blind, or have developed a disability. This includes children. To qualify, you must have limited income and limited resources. The federal government pays for SSI using general tax revenues. Many states also pay an extra benefit on top of the federal payment. (Source: Social Security Administration, The Red Book)

Some people may qualify for both SSDI and SSI benefits. The SSA uses the term “concurrent” to describe these situations. (Source: Social Security Administration, The Red Book)

Who is eligible for SSDI?

To be eligible for Social Security Disability Insurance (SSDI) benefits, you must have worked in jobs covered by Social Security. You must also have a medical condition that meets the SSA’s strict definition of disability. The SSA pays monthly benefits to people who cannot work for a year (12 consecutive months) or more because of a disability. Generally, there is a five-month waiting period before benefits start. The SSA pays the first benefit in the sixth full month after the date it finds your disability began. (Source: Social Security Administration, How Does Someone Become Eligible?)

It is important to know that the SSA’s definition of disability is different from other programs. The SSA only pays for total disability. No benefits are paid for partial disability or for short-term disability. (Source: Social Security Administration, How Does Someone Become Eligible?)

In addition to meeting the disability definition, you must have worked long enough and recently enough under Social Security. This is measured by “work credits.” You earn work credits based on your total yearly wages or self-employment income. You can earn up to four credits each year. The amount needed for a credit changes over time. In 2026, you earn one credit for each $1,890 in wages or self-employment income. This means once you have earned $7,560, you have earned your four credits for the year. (Source: Social Security Administration, How Does Someone Become Eligible?)

Generally, you need 40 credits to qualify for SSDI. At least 20 of these credits must have been earned in the last 10 years ending with the year your disability began. This is sometimes called the 20/40 Rule. However, younger workers may be able to qualify with fewer credits. (Source: Social Security Administration, How Does Someone Become Eligible?)

Who is eligible for SSI?

SSI is for anyone who is aged 65 or older, is blind, or has a qualifying disability. They must also have limited income and limited resources. (Source: Social Security Administration, SSI Eligibility)

To be eligible for SSI, you must also meet certain other requirements. You must be a U.S. citizen or national, or a noncitizen in certain categories allowed by the Department of Homeland Security. You must be a resident of one of the 50 states, the District of Columbia, or the Northern Mariana Islands. You cannot be absent from these places for a full calendar month or for 30 consecutive days or more. You also cannot be confined to an institution, such as a hospital or prison, at the government’s expense. (Source: Social Security Administration, SSI Eligibility)

If you apply for SSI, you must also apply for any other program benefits or payments you may be eligible for. This could include pensions or Social Security benefits. You must also give the SSA permission to ask for your financial records from any financial institution. Finally, you must file an application. (Source: Social Security Administration, SSI Eligibility)

How are benefit amounts and health coverage different?

The way the SSA calculates your monthly benefit amount and the health coverage you receive differs between SSDI and SSI.

For SSDI, your monthly payment amount is based on your lifetime average earnings that were covered by Social Security. The SSA may reduce your payment if you receive workers’ compensation or certain public disability benefits. However, other income you have that you did not earn, or your resources, do not affect your SSDI payment. With SSDI, your Medicare health coverage generally starts after you have received SSDI benefits for 24 months. (Source: Social Security Administration, The Red Book)

For SSI, the SSA starts with the Federal Benefit Rate. This is a set amount. Then, the SSA subtracts your countable income. If your state pays an extra benefit, that amount is added. There is no state supplemental payment with SSDI. (Source: Social Security Administration, The Red Book)

For January 2026, the SSI monthly federal benefit rate is $994 for an individual or child. For a couple who live alone or pay their share of food and housing costs, the rate is $1,491. These rates apply if your state does not add to the federal rate and you have no countable income. (Source: Social Security Administration, SSI General Information)

Many states pay an additional supplemental benefit. The amount of this state supplement varies from state to state. (Source: Social Security Administration, SSI General Information)

There are also limits on the resources you can have to get SSI. For January 2026, the SSI resource limit is $2,000 for an individual or child and $3,000 for a couple. The SSA does not count all of the things you own as a resource. (Source: Social Security Administration, SSI General Information)

SSI is linked to Medicaid, which is a health insurance program funded by both the federal government and states. It is for people with limited income and resources. In most states, if you receive SSI, you may be automatically eligible for Medicaid. An SSI application can also serve as an application for Medicaid in these states. In other states, you must apply for and establish your eligibility for Medicaid with a different agency. The SSA will direct you to that office if this is the case. (Source: Social Security Administration, SSI and Eligibility for Other Government and State Programs)

It is possible for many people to receive both SSI and Social Security benefits. It is also possible to get both Medicare (linked to Social Security benefits) and Medicaid (linked to SSI benefits). (Source: Social Security Administration, SSI and Eligibility for Other Government and State Programs)

Practical Steps

If you are considering applying for disability benefits, here are some general actions you can take:

• Keep Records: Maintain detailed records of your work history, including dates of employment, job duties, and earnings. Also keep thorough records of all your medical treatments, diagnoses, and medications related to your disability or blindness. Track your income and resources carefully.
• Gather Documents: Collect documents that show your work credits and earnings. This helps the SSA determine your SSDI eligibility.
• Understand Definitions: Learn the SSA’s strict definition of disability. This will help you understand what information you need to provide.
• Check Income and Resources: If you are considering SSI, review your income and resources to see how they compare to the limits. Remember that not all of your belongings count as resources.
• Be Prepared to Apply: If you decide to apply, be ready to provide all necessary personal, financial, and medical information. The SSA may also ask for permission to access your financial records.

When to get legal help

Applying for Social Security disability benefits can be a complex process. The rules and requirements can be detailed, and they may vary by state, especially concerning state supplements for SSI and Medicaid procedures.

It is wise to talk to a licensed attorney in your state if you have questions about your specific situation. An attorney can explain the detailed rules and help you understand how they apply to your circumstances. You can also reach out to a legal aid office in your area for assistance. Your state bar association may also be able to provide resources or referrals for legal help related to Social Security benefits.