How Far Back Can I Get Paid Disability Benefits?

Social Security Disability Insurance (SSDI) pays monthly benefits to you if you are disabled and unable to work. If you are approved for SSDI, you may be able to get past, or retroactive, benefits from before you applied for SSDI.

Established Onset Date

Your "onset date" is when your disability began; that is, when your impairment prevented you from working. The date that the SSA determines to be your onset date is your "established onset date," or EOD. If your EOD is before you applied for SSDI, or before you were approved for benefits, you should be able to obtain past benefits, or backpay.

On the date that the SSA determines all of the following are true, that date will become your EOD:

  • you cannot do work that you used to do
  • your medical condition prevents you from doing other types of work
  • your disability has lasted or is expected to last for at least one year or to result in death, and
  • you have satisfied the other, non-medical, eligibility criteria, such as obtaining enough work credits and having the appropriate citizen or qualified legal alien status.

It  It is sometimes important to know that the established onset date is not necessarily the date you became disabled, which the SSA sometimes refers to as the “medical onset date,” or “MOD.” The medical onset date is the date that your impairment became severe enough to qualify you as “disabled” for SSDI purposes, but you may not have met other eligibility criteria on that date.

Waiting Period

When figuring out how far back you will be paid benefits, you have to keep in mind that there is a “waiting period.” When the SSA determines what your established onset date is, it will not give you benefits immediately after your EOD. The SSA requires that you wait five months after your EOD before you can get benefits. The five months after your EOD are called the “waiting period” and they must be five complete months. Unless your EOD is the very first day of a month, the SSA will wait until the first day of the next month and then start counting the five months you have to wait. For example, if your EOD is January 2, the rest of January does not count in your five-month waiting period. Your waiting period would be February, March, April, May and June. Your benefits would start to be paid July 1.

Limits on Retroactive Payments

The SSA will not pay you for more than 12 months of retroactive benefits. Since there is also the five-month waiting period, figuring out your retroactive benefits can be confusing. Using some examples may help clarify. 


If you apply for benefits on October 1, 2011, and the SSA gives you an EOD of January 2, 2011 EOD, you would get retroactive benefits from July 1, 2011. You will not receive benefits from January to June, because that is your waiting period.

If you apply for SSDI on July 1, 2011, and your EOD is January 2, 2011, you will receive benefits from July 1, 2011. 

If you apply for SSDI on October 1, 2012, and your EOD is January 2, 2011, you will not get retroactive benefits all the way back to July 1, 2011, because the SSA cannot give retroactive payments for more than 12 months. You will get benefits back to October 1, 2011.

If your EOD is more than 17 months from when you applied, you will still only get 12 months of backpay. 

Exceptions to the Waiting Period

There are two exceptions. First, if you are eligible for SSDI benefits as the child of a disabled person, you do not have the five month waiting period.

Second, if your benefits start and the stop again, you don't have the five-month waiting period. That is, if you were approved for SSDI benefits some time ago, but then improved and went back to work and your SSDI benefits stopped, but then you became disabled again, you will not have to wait the five months from your EOD until you can receive your benefits. However, the exception applies only if it has been five years or less from your first EOD to your second.

Lump Sum Versus Installment Payments

SSDI back payments is usually paid in one lump sum; SSI back pay is usually paid in installment payments. For more information, see our article on lump sum payments of back pay.

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