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Social Security Disability Insurance is a federal program that provides monthly payments to people who have worked and paid Social Security taxes but can no longer work due to a medical condition. Unlike Supplemental Security Income (SSI), which is a needs-based program, SSDI is based on your work history and Social Security contributions. To receive SSDI payments, you must have a condition that prevents you from working for at least 12 months or that is expected to result in death.
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The Social Security Administration uses a specific definition of disability that is more restrictive than many other programs. Your condition must be severe enough that it stops you from doing substantial work. The SSA maintains a list of conditions—called the Blue Book—that automatically meet their disability criteria. However, conditions not on this list may still qualify if they cause similar limitations. Approximately 8.6 million people currently receive SSDI benefits, according to 2023 Social Security Administration data.
SSDI differs from workers' compensation and unemployment insurance. Workers' compensation covers job-related injuries, while unemployment insurance provides temporary support when you lose a job. SSDI, by contrast, is a permanent disability program for those whose conditions prevent them from any substantial work. Your SSDI payment amount is based on your individual earnings record, not on your living expenses or family size.
Family members may also receive benefits based on your work record. These can include your spouse (age 62 or older, or any age if caring for a child under 16), children up to age 19 if attending school full-time, and unmarried children of any age if disabled before age 22. The total amount that can be paid to your entire family is limited to approximately 150 to 180 percent of your benefit amount.
Practical takeaway: SSDI is a work-based program for people with long-term disabilities, not a general financial assistance program. Understanding whether your situation involves a work injury, job loss, or medical disability will help you determine which program might be relevant to your circumstances.
Supplemental Security Income is a needs-based program that provides monthly payments to people who are aged 65 or older, blind, or disabled, and who have limited income and resources. Unlike SSDI, SSI does not require a work history. Instead, the program focuses on financial need. As of 2024, the federal SSI payment for an individual is $943 per month, though some states add supplemental payments on top of the federal amount.
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SSI has strict limits on how much money and property you can own. These are called "resource limits." Currently, an individual can own no more than $2,000 in countable resources, and a couple can own no more than $3,000. Resources include cash, bank accounts, stocks, bonds, and vehicles beyond one allowed car. Your home and the land it sits on do not count toward resource limits. Certain items like personal items, household goods, and one car are also excluded from these calculations.
Income limits also apply to SSI. In 2024, the monthly income limit is approximately $1,943 for an individual and $2,915 for a couple, though some income is not counted. For example, the first $65 of earned income per month is excluded, and half of earnings above that amount don't count. This structure is designed to encourage people to work while still maintaining their SSI payments. As your income increases, your SSI payments gradually decrease rather than stopping immediately.
Many people confuse SSI with SSDI because both are Social Security programs and both provide monthly payments based on disability. However, SSI is meant for people in financial need regardless of work history, while SSDI is based on your contributions through payroll taxes. Some people receive both SSI and SSDI, a situation sometimes called "concurrent benefits." This typically occurs when someone's SSDI payment is lower than the SSI federal benefit rate.
Practical takeaway: SSI is for people with disabilities, blindness, or age 65-plus who have limited money and possessions. If you have more than $2,000 in resources, you generally will not receive SSI payments, even if you meet medical requirements.
When you request Social Security disability benefits, the SSA must determine whether your medical condition meets their definition of disability. This process begins with a thorough review of your medical records, test results, and doctor's statements. The SSA will ask for details about your condition, when it started, what treatments you've received, and how it affects your daily activities. This medical evidence is the foundation of the entire decision process.
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The Social Security Administration publishes the Blue Book, an official listing of medical and mental health conditions that meet their disability criteria. Conditions in the Blue Book include arthritis, cancer, cardiovascular disease, diabetes, hearing loss, HIV/AIDS, back pain with nerve involvement, bipolar disorder, depression, and many others. Each condition has specific medical criteria listed. For example, arthritis qualifies under the Blue Book if you have "persistent inflammation or deformity of peripheral joints with signs of involuntary weight-bearing joint dysfunction."
If your condition is on the Blue Book and you meet the specific criteria listed, the SSA can make a disability determination relatively quickly. However, if your condition is not on the Blue Book, the SSA evaluates whether your medical condition causes limitations equal to those of a Blue Book condition. This process requires detailed medical evidence showing how your condition limits your ability to work. For instance, if you have a back condition not specifically listed, the SSA might consider whether your condition causes pain, loss of function, and treatment side effects that together equal a listed condition's severity.
The medical review process can take several months. During this time, the SSA may request additional medical records from your doctors, order a consultative examination at government expense, or ask you to provide more information about your condition. According to Social Security data, the average processing time for initial benefit decisions is about 3 to 6 months, though cases involving medical evidence collection may take longer.
Practical takeaway: Gather all your medical records, test results, and documentation from your doctors before contacting Social Security. The more complete your medical evidence, the more efficiently your case can be reviewed.
Social Security has built-in work incentive programs designed to allow people with disabilities to test their work abilities without immediately losing their benefits. These programs recognize that some people want to work despite their disabilities and that earning some income is possible even with medical limitations. Understanding these work incentives can significantly affect your financial planning if you receive or are considering disability benefits.
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The Trial Work Period allows SSDI recipients to work and earn any amount for nine months (not necessarily consecutive) without affecting their benefits. During these nine months, you continue receiving your full SSDI payment even though you are working. The SSA counts a month as a trial work month if your earnings are above $1,110 per month in 2024. This threshold increases yearly. The trial work period gives you time to see whether you can sustain work before your benefits change.
The Extended Period of Eligibility continues for 36 months after your trial work period ends. During this time, you receive your SSDI payment for any month your earnings fall below the substantial gainful activity level, which is $1,550 per month in 2024. If your earnings exceed this amount in a given month, you don't receive a payment that month, but your benefits resume if your earnings drop below the limit in future months. This provides a safety net if you cannot maintain work.
Additional work incentives include impairment-related work expenses (IRWE), which allows you to deduct costs related to your disability—such as medical devices, transportation, or personal care assistance—from your earned income when calculating benefits. Plan to Achieve Self-Support (PASS) allows you to set aside income and resources for work goals, such as vocational training. Some states also offer Medicaid continuation programs that allow you to keep health coverage even as your earnings increase.
Practical takeaway: If you receive SSDI and want to test working, you can earn any amount during your trial work period without losing benefits. After that, you have flexibility to work part-time while keeping some benefits if your monthly earnings stay below the substantial gainful activity level.
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This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.