SSDI Back Pay Estimator

When a Social Security disability claim finally wins, it usually comes with past-due benefits — back pay for the months the process consumed. Enter your three key dates for a rough estimate of the months and dollars involved. It is not legal advice, and Social Security’s own computation controls.

Back pay turns on three dates: when your disability began, when you applied, and when the claim is (or will be) approved. The tool applies SSDI’s five-month waiting period and the 12-month look-back cap. (SSI works differently — it has no retroactivity at all; see the note below.)

The estimate

When did your disability begin (or when will you claim it began)?

Social Security calls this the onset date. The date the agency ultimately establishes may differ from the date you allege — this estimate assumes they agree with you.

When did you apply (or when will you)? When was the claim approved (or when might it be)?

If you are still waiting, enter a realistic future date — initial decisions commonly take 6–12 months, and a claim that goes to hearing often takes two years or more.

Estimated monthly benefit (optional)

Your my Social Security account statement shows your estimated disability benefit. Leave blank to see months only.

Please read. This tool is a free educational aid, not legal advice, and using it does not create an attorney-client relationship. It applies two general SSDI rules — the five-month waiting period and the 12-month pre-application look-back cap — in simplified form. It cannot account for the many things that change a real award: the onset date Social Security actually establishes, workers’-compensation and other offsets, the windfall offset where SSI was paid, long-term-disability repayment obligations, the representative’s fee (typically the lesser of 25% of past-due benefits or the current $9,200 cap), or annual cost-of-living changes. SSI is different: SSI has no retroactivity — payments can never begin before the month after the application — which is why an SSI application should be filed immediately. Read how back pay works, or for a real evaluation of your claim, contact the firm.

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