If you are awarded disability, you will receive a regular monthly benefit and, most likely, some amount of back pay which will be determined by your month of entitlement (when your disability began) and when you filed your claim. You can be eligible to receive backpay in either the Social Security Disability program or Supplemental Security Income program.

The amount of back pay you get depends on three things: when you filed your disability claim, when your disability began (onset date), and how long it takes to get approved. Back pay is simply what Social Security owes you by the time you finally get your benefits. Unfortunately for most people, claims usually take a long time. It is not unusual for a claim to take over a year. And if a disability hearing is needed, it can take over two to three years. Fortunately, for those who receive a disability award, there may be substantial back pay. Amounts in the tens of thousands of dollars are not unusual.
Which Type of Claim Pays More?
Either program can pay significant back pay. It depends on how long your claim takes. Whether the claim is for SSD (Social Security Disability), or SSI (Supplemental Security Income) makes no difference since they are both handled exactly the same way. SSD, however, has a waiting period of five moths, while SSI does not have a waiting period. The waiting period is an elimination period – for SSD claims, the Social Security Administration will not pay you for the first five months that you were considered disabled. This is why it is important to prove that your disability began as far back as possible, and this is why your medical records are so important. Ironically, the only time a person will not get back pay, or get very little back pay, is when they apply after first becoming disabled and are immediately approved – although this does not happen often.
How the SSA Determines Your Onset Date

Common dates that Social Security might use for your onset date include:
- the last date you worked full-time
- the first date you received treatment for your impairment
- the date of a medical record showing evidence of your condition
- the date a doctor says you became disabled
- the date of an accident that caused your disability, or
- the first date that your symptoms became disabling.
The onset date has significant implications for your claim:
- Eligibility for Benefits: To qualify for SSD benefits, you must meet the SSA’s requirement of being unable to work for at least 12 months or expecting your condition to result in death. Choosing an accurate onset date is essential to proving your eligibility.
- Retroactive Benefits: The onset date determines the amount of backpay you may receive. In Oklahoma, SSD benefits can include up to 12 months of retroactive payments if your onset date precedes your application date by more than five months.
- Medicare Coverage: If your disability is approved, you’ll qualify for Medicare after a 24-month waiting period starting from your onset date. This is especially important for residents in Mississippi who rely on these benefits for ongoing medical care.
Challenges in Establishing the Onset Date
Claimants often face challenges when SSA disagrees with her alleged onset date, Common issues include:
- Insufficient medical evidence from the time of the time of the alleged onset
- Gaps in treatment history
- Continued work activity after the alleged onset date
If SSA assigns an onset date later than you believe is accurate, it could reduce your retroactive benefits and delay Medicare eligibility.
How to Strengthen Your Claim
- Document Early Symptoms – start tracking your condition’s impact on your work and daily life as soon as possible.
- Seek Regular Medical Treatment – consistent medical care not only supports your claim but also helps establish a clear timeline of your disability
- Work with an Advocate – a skilled disability advocate can help gather evidence, present your case, and appeal any unfavorable decisions about your onset date.
SSI Back Pay: Rules and Limitations
Determining eligibility for SSI back pay involves understanding specific criteria set by the Social Security Administration. The key factors include the onset date of the disability and the application date. These details are crucial in deciding back pay amount for a successful SSI claim. In SSI claims, there is no five-month waiting period in calculating the SSI back pay however there are maximum amounts that an individual is eligible for based on the dates in their application. Note: there is no back pay maximum, either for SSDI or SSI. For those that receive SSI benefits, payments begin the first full month after you are approved for benefits.
How Are Back Payments Made
If SSA approves your for SSDI only, you will most likely receive one lump-sum payment for the entire amount of your SSDI back pay.
If you are approved for SSI, or you get approved for both SSI and SSDI, the rules are different. Social Security generally pays the past-due benefits for SSI or combined SSI/SSDI in three equal installment payments, separated by six months each.
However, you are eligible for large first and second installments if you need money for “necessities” (housing, food, medical needs) or to pay off debts for necessities. Or you may be eligible for one lump-sum payment if you are not expected to live past the next 12 month or you are no longer eligible for SSI benefits at the time you receive your back pay (and not expected to become eligible for benefits within the next 12 months).
As of August 29,2024, you no longer need to provide documentation of your debts or expenses in order to qualify for increased installment payments. You can simply allege that you require the payments for necessities or debts due to necessities.
If the back pay owed to you is more than three times the maximum monthly SSI benefit amount, the SSA will pay you in partial installment payments. In 2025, the maximum federal SSI monthly benefit is $967 (but your amount may be different if your state pays an SSI supplement).
Back Pay and Your Attorney Fees
Disability attorneys accept cases on a contingency fee basis, which means there are no upfront costs for assistance with your disability application. The attorney will require a percentage of your back pay as the fee for services.
The SSA sets strict limits on attorney fees for individuals receiving disability benefits. Fees are capped at 25% of your back pay, with a maximum of $9,200. The SSA will pay your attorney directly from your back pay. All applicable legal fees will be deducted before you receive the lump sum payment. In addition, attorneys may charge for incidental expenses along with the standard fee, such as for the cost of obtaining medical records. However, these expenses should also be clearly defined in the fee agreement.
Common Reasons for Delays in Receiving Back Pay

When claimants file for disability benefits, they often discover that the process takes much longer than expected. Certain common obstacles to these delays include administrative backlogs, incomplete or inaccurate information, appeals and legal challenges, and other benefits you are eligible to receive such as workers compensation, government pension or SSI.
If you are eligible for SSI, and you received your SSI back pay before your Social Security back pay, your Social Security must be reduced by the amount of SSI you received for the same months that you are eligible to get Social Security.
Understanding the intricacies of Social Security Disability Back Pay can be challenging, but with the right information and guidance, you can navigate this process more effectively. Remember, you’re not alone in this journey, and there are resources available to help you every step of the way.
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