Erroneous Refund: How to Return It, Penalties, and IRS Notices

If the IRS sent you a refund you weren’t entitled to, return it within 21 days. The method depends on how the money reached you: void and mail back an uncashed paper check, ask your bank to reverse a direct deposit, or send a personal check or money order to the U.S. Treasury if you already cashed it. Interest starts accruing from the date the refund was issued and keeps running until the IRS receives full repayment.¹

If the Paper Check Is Uncashed

Write “Void” in the endorsement area on the back of the check. Don’t staple, bend, or paper-clip it. Include a short note that says “Return of Erroneous Refund Check” and briefly explains why you’re sending it back.²

Mail the package to the IRS campus that serves your state. The correct address is listed on the IRS’s About Form 3911 page and depends on where you live. Use certified mail with return receipt so you can prove the date of delivery.¹

If the Money Came by Direct Deposit

Call your bank’s Automated Clearing House department and ask them to return the deposit to the IRS. Then call the IRS to explain that the direct deposit is being returned: 800-829-1040 for individuals, or 800-829-4933 for businesses. Interest can still accrue while the reversal works its way through, so don’t wait to make the calls.¹

If You Already Cashed or Deposited the Check

Send a personal check or money order payable to the U.S. Treasury. On the check itself, write all four of the following:

“Payment of Erroneous Refund”
The tax period the refund was issued for (for example, 202512 for December 2025)
The account type: IMF for an individual return, BMF for a business return
Your taxpayer identification number: Social Security number, EIN, or ITIN

Mail the payment with a brief written explanation to the IRS campus address for your state, the same one used for returning paper checks. Aim to have it in the mail within 21 days.²

If the Refund Came from Identity Theft

A refund that appears in your account because someone filed a fraudulent return using your Social Security number isn’t a routine erroneous refund. Return the money using the steps above, but also file Form 14039, the Identity Theft Affidavit. The IRS’s identity theft unit at 800-908-4490 can help you clean up the account.³ Until you both return the funds and flag the fraud, the IRS treats the money as legitimately yours.

What Happens If You Don’t Send It Back

The IRS has several ways to recover the money, and it generally works through them in order.

Account Adjustment

The IRS ordinarily has three years from the date a return was filed to assess additional tax.⁴ Within that window, the agency can adjust your account internally, reducing your balance by the refund amount and sending a notice demanding repayment with interest.

Notice of Deficiency

After the three-year assessment window closes, the IRS can’t just adjust the account. It has to issue a formal Notice of Deficiency, sometimes called a 90-day letter. You then have 90 days from the date on the notice (150 days if you’re outside the United States) to petition the U.S. Tax Court. Miss that window and the IRS can assess the amount and move to collection.⁵

Offset of Future Refunds

Once the unpaid amount is recorded as a debt, the Treasury Offset Program can intercept future federal refunds to satisfy it. The Bureau of the Fiscal Service checks for outstanding debts before releasing any refund.⁶ An unreturned erroneous refund can quietly consume refunds you were counting on for years.

Federal Lawsuit

As a last resort, the government can sue to recover the money under IRC Section 7405.⁷ The suit must be filed within two years of the date the refund was issued, or within five years if the refund was induced by fraud or misrepresentation.⁸ Litigation is uncommon for small dollar amounts but does happen when the sum is large or fraud is involved.

Interest and Penalties

Interest runs from the date the refund was issued until the IRS receives full repayment. The rate is the federal short-term rate plus three percentage points, compounded daily, and is recalculated quarterly.⁹ Because it compounds daily, a delay of a few weeks meaningfully increases the balance.

If the excess refund was purely the IRS’s mistake and you return it promptly, the agency generally won’t assess a penalty on top. Penalties become a risk when the oversized refund came from something you did wrong on the return. The accuracy-related penalty is 20% of the underpayment attributable to negligence or a substantial understatement of income tax.¹⁰ So an inflated deduction or omitted income that caused the extra refund can mean repayment plus 20%.¹¹ Returning the money inside the 21-day window also strengthens any later request for interest abatement, since the IRS has discretion to waive interest when the taxpayer acted in good faith.

If You Filed Jointly

Joint filers share full responsibility for everything on the return, so if your spouse’s error caused the erroneous refund, the IRS can still collect the whole balance from you. Innocent spouse relief under IRC Section 6015 can break that liability, but you have to show you didn’t know (and had no reason to know) about the understatement that produced the excess refund, and that holding you liable would be unfair. The election has to be made within two years after the IRS begins collection activity against you.¹² That two-year clock runs whether you know about the collection action or not, which matters during a divorce or separation.

If You Believe the Refund Was Actually Yours

You aren’t required to accept the IRS’s conclusion that the refund was erroneous. Respond to the initial notice in writing, explain your position, and attach documentation. If a Notice of Deficiency follows, you can petition the Tax Court within 90 days and have a judge review the case before paying anything.⁵ If the dispute reaches the point of a federal tax lien or proposed levy, you can request a Collection Due Process hearing with the IRS Independent Office of Appeals by filing Form 12153 within 30 days of the collection notice.¹³

1
Internal Revenue Service. Topic No. 161, Returning an Erroneous Refund – Paper Check or Direct Deposit
2
Internal Revenue Service. Internal Revenue Manual 21.4.5 – Erroneous Refunds
3
Internal Revenue Service. Reporting Identity Theft
4
Office of the Law Revision Counsel. 26 USC 6501 – Limitations on Assessment and Collection
5
Internal Revenue Service. Understanding Your CP3219N Notice
6
Taxpayer Advocate Service. How to Prevent a Refund Offset
7
Office of the Law Revision Counsel. 26 USC 7405 – Action for Recovery of Erroneous Refunds
8
Office of the Law Revision Counsel. 26 USC 6532 – Periods of Limitation on Suits
9
Internal Revenue Service. Topic No. 653 – IRS Notices and Bills, Penalties and Interest Charges
10
Internal Revenue Service. Accuracy-Related Penalty
11
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
12
Office of the Law Revision Counsel. 26 USC 6015 – Relief from Joint and Several Liability on Joint Return
13
Taxpayer Advocate Service. Collection Due Process (CDP)