Understanding the Difference Between SSDI and SSI Can Change Your Clients’ Lives

The Social Security Administration (“SSA”) offers two programs, often confused with each other, to help disabled and low-income Americans, as well as qualified non-citizens, pay their living expenses.

Social Security Disability Insurance (“SSDI”) is available to individuals who paid into the Federal Insurance Contributions Act (“FICA”) system through payroll deductions or while they were self-employed. Supplemental Security Income (“SSI”), on the other hand, is a needs-based program offered to qualifying disabled individuals.

Each year, these programs pay out more than $200 billion in benefits. If you’re a personal injury attorney or an attorney who often works with injured clients or low-income clients, understanding the difference between SSDI and SSI and advising your clients accordingly could change their lives by putting them on the path to receiving these benefits so they can keep a roof over their families’ heads and food on their kitchen tables.

SSDI is for individuals who’ve worked and paid taxes

FICA is a mandatory deduction from every paycheck an employee receives. These taxes fund Social Security and Medicare, with 6.2% of employee wages going to the former and 1.45% going to the latter. Employers match these contributions and pay their share to the U.S. government.

FICA taxes fund SSDI, which limits eligibility to individuals with a work history in the U.S. As a general rule of thumb, individuals who have worked five of the last ten years are eligible for SSDI, with benefit amounts determined by the total number of years they’ve worked in that period and the amount of money they paid into the system. In 2026, the maximum monthly SSDI benefit is $4,152. That is not pocket change.

Children and spouses can also receive SSDI benefits, which are typically referred to as dependent benefits. When they qualify, children under 18 are entitled to benefits equal to half of what a disabled parent receives. Those children, no matter how many there are, split that amount until they are 18. Once a child turns 18, they typically are no longer entitled to benefits, but their siblings under 18 are. However, a child who received benefits on their parent’s Social Security record may be eligible to continue receiving benefits on that parent’s record past the age of 18 if they have a qualifying disability that started before they turned 22.

Receiving SSDI does not automatically qualify an individual for Medicare. Generally, SSDI recipients, like other adults, must turn 65 to be eligible for Medicare. However, if your client has received SSDI for 24 months, they automatically become eligible for Medicare.

Importantly, SSDI does not have asset limits. Since it is considered an insurance program, a qualifying claimant can have substantial assets and still receive funds. The qualifying factor is injury, not income level.

To qualify for SSDI, an individual must complete a five-step process that considers whether (1) they’re working at a substantial gainful level (i.e., Are they working and earning more than a particular amount each month in gross wages?); (2) the individual has a severe impairment; (3) the individual’s disability meets the SSA’s definition of a disability; (4) the individual can do work that they’ve done in the past; and (5) the individual can do any other types of work.

SSI is for individuals with no work history or low income

SSI, on the other hand, requires that individuals have no more than $2,000 ($3,000 for married couples) in assets, though this excludes certain necessities, like a home and a primary automobile. But unlike SSDI, no work history is required. Generally, those who qualify for welfare will qualify for SSI, as SSI is intended to provide cash assistance to income-qualified individuals.

In 2026, SSI offers a monthly maximum of $994 for individuals and $1,491 for married couples.

Some individuals may qualify for both SSDI and SSI benefits based on their work history, income, and resources. In most states, an individual is immediately eligible for Medicaid if they’re eligible for SSI.

Retroactive benefits and application deadlines under SSDI and SSI

It’s important that your clients understand how retroactive benefits work under both SSDI and SSI. SSDI imposes a five-month waiting period for benefits, meaning that individuals who file successful claims will not receive benefits for the first five months after their claim is approved.

On the other hand, under SSI, successful claimants will be paid back to the first full month following the filing of their claim. This means that if your client filed on January 15th and their claim was approved on July 1, they would receive payments for the time covering February 1 through June 30.

Helping clients navigate a bureaucratic labyrinth

Successfully applying for SSDI and SSI benefits can be a challenging process that’s stressful for clients. It’s important, particularly for more serious disability cases, that individuals seeking SSDI or SSI benefits work with an attorney who has a deep understanding of these programs. Applications can be made online or in person at a Social Security office. The sooner a client can apply for benefits, the better. The SSA often experiences delays in granting approval, and a client may need to go back and forth with the SSA several times regarding documentation and medical records.

When a client works with an attorney when applying for SSDI or SSI, they dramatically increase the odds that their claim will be approved. Attorneys may be tempted to assist their clients with their applications, but if they do not understand the process, the required documents and information, or the inner workings of the SSA, they may do more harm than good.

There is a highly skilled disability bar whose members understand best practices for submitting SSDI and SSI applications that get approved, as well as for navigating the SSA’s bureaucratic labyrinth. If you have disabled or low-income clients and aren’t comfortable guiding them through the SSDI and/or SSI application process, consider reaching out to a member of the disability bar. It’s in the client’s best interests for you to do so. In addition, many law firms with SSDI and SSI practices will pay referral fees when their local rules of professional conduct permit them to.

Attorneys and their staff benefit in other ways beyond referral fees when they refer clients to members of the disability bar. By helping a referred client secure SSDI benefits while their case is in suit on another issue, members of the disability bar and their staff can reduce repeated inquiries from those clients—who are often frustrated and financially struggling because of their injuries—to the referring law firm regarding the timing of their case, when they can expect a resolution, and similar questions. This frees up referring attorneys (and their staff) to handle other client-related tasks.

SSDI and SSI benefits are lifelines for disabled and low-income clients. If you work with disabled or low-income clients, you could change their lives by helping them understand whether they should apply for SSDI and/or SSI benefits and, if so, assisting them with the process, either directly or by referring them to a knowledgeable and experienced disability attorney.