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Social Security Disability Back Pay: How It Works

Helping disability claimants since 1996. Attorney Eitan Dagan has spent 30 years helping people through Social Security Disability claims.

Disability back pay is the money Social Security owes you for the months you were eligible while you waited for approval; SSDI back pay can reach up to 12 months before the month you applied, while SSI back pay starts no earlier than the month after you applied.

Reviewed by Eitan Dagan, attorney, on October 27, 2026.

SSDI back pay

  • Social Security picks the date your disability began.
  • There is usually a five-month waiting period. Your first benefit is for the sixth full month after that date.
  • SSDI can pay for up to 12 months before the month you applied, if you were disabled and met all the other rules.
  • It also pays for the months between your application and your approval.

SSI back pay

  • There is no five-month waiting period for SSI.
  • SSI cannot pay for the month you applied or any months before. The first possible month is the month after you apply.
  • SSI can pay for the months between then and your approval.

Not sure which program you are in? Read SSI vs. SSDI.

Why you should not wait to apply

Back pay depends on your application date. Every month you wait can be a month that cannot be paid. If you were denied, appealing on time can keep your first application date alive. See Denied? How to appeal.

Fees come only from back pay, and only if you win

No fee unless you win. You will not be charged for case expenses if we do not win your case.

We use the standard Social Security fee agreement. Fees are set and approved by the Social Security Administration. Under that agreement, the fee is 25% of your past-due benefits, up to $9,200.

Frequently asked questions

What is disability back pay?

Back pay (Social Security calls it past-due benefits) is money for the months you were owed benefits while you waited for a decision.

How far back can SSDI back pay go?

SSDI can pay for up to 12 months before the month you applied, if you were disabled during that time and met all the other rules. There is usually a five-month waiting period from when your disability began.

Does SSI pay back pay?

SSI can pay for months after you applied while you waited for a decision. It cannot pay for the month you applied or any months before. The first possible month is the month after you apply.

Why does it matter when I apply?

Because back pay is tied to your application date. For SSI, months before you apply cannot be paid. For SSDI, back pay can only reach 12 months before you apply.

How is the lawyer’s fee paid from back pay?

No fee unless you win. You will not be charged for case expenses if we do not win your case. If you win, the fee comes from your past-due benefits under the standard Social Security fee agreement. It is 25% of your past-due benefits, up to $9,200, and Social Security must approve it.

Is the lawyer’s fee taken from my monthly checks?

Under the standard fee agreement, the fee is based on your past-due benefits only, not your future monthly checks.

Contact Law Offices of Eitan Dagan, P.C.

Law Offices of Eitan Dagan, P.C.
Main office: 86-52 Woodhaven Blvd, Woodhaven, NY 11421
Melville office: 200 Broadhollow Rd, Suite 207, Melville, NY 11747
Phone: 516-310-9160
Email: daganadmin@edaganlaw.com
Hours: Monday to Friday, 9 AM to 5 PM
Se habla español.

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