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If you received a tax refund by mistake—because of an error on your return, a calculation mistake by the IRS, or a duplicate payment—you will need to repay it. The IRS does not forgive these amounts, and the longer you wait, the more interest and penalties accumulate. The fastest way to repay is to file an amended return or send a check directly to the IRS, depending on whether you have already filed for the current tax year.
The method you use depends on timing: if you catch the error before filing your next return, you can correct it on that return. If you have already filed the next return, or if the overpayment was from a prior year, you will send payment directly to the IRS or request an offset from a future refund.
Key Takeaways
- If you catch the error before filing your next tax return, you can reduce your refund claim or increase what you owe on that return instead of sending a separate payment.
- If you have already filed your current return, send a check to the IRS with a written explanation of which tax year the overpayment covers and why you are repaying it.
- The IRS will assess interest on the amount owed from the original refund date, and penalties may explore if the error was due to negligence or fraud.
- You can also request that the IRS offset the overpayment against a future refund, though this takes longer than a direct payment.
- Keep documentation of your repayment—a cancelled check, receipt, or IRS letter—because you may need it if the IRS contacts you about the original refund.
Repaying through an amended return if you haven't filed yet
If you have not yet filed your tax return for the current year, the simplest approach is to correct the error on that return before you file. This means recalculating your income, deductions, or credits to reflect the correct amount, which will reduce your refund or increase what you owe. You file the return normally—no separate payment needed.
For example, if you received a $2,000 refund last year that you should not have received, and you are now filing your 2024 return, you would report the $2,000 as additional income on your 2024 return. This reduces your 2024 refund by that amount (or increases what you owe). The IRS will see the correction when they process your return.
This method avoids a separate payment and keeps everything in one filing. However, it does not address interest or penalties that may be owed on the original overpayment—those are separate issues the IRS may pursue.
Sending a check directly to the IRS
If you have already filed your current return, or if the overpayment was from a prior year, send a check to the IRS with a cover letter. The address depends on where you live; the IRS website lists the correct mailing address for your state under "Where to File" for individual returns.
Write a letter that includes your name, Social Security number, the tax year the overpayment covers, the amount you are repaying, and a brief explanation of why you are repaying it. For example: "I received a refund of $2,000 for tax year 2023 in error. I am enclosing a check for $2,000 to repay this amount." Make the check payable to "United States Treasury" and include it with your letter.
Mail the letter and check together. Keep a copy of the letter and a photo of the front and back of the cancelled check once it clears. The IRS processes these payments slowly—allow 8 to 12 weeks for the payment to be recorded in their system. You can check the status by calling the IRS at 1-800-829-1040 after six weeks.
Understanding interest and penalties on the overpayment
The IRS charges interest on overpayments from the date the refund was issued until the date you repay it. The interest rate changes quarterly and is set by the IRS; it is currently between 8 and 9 percent annually, though this varies. Interest accrues daily, so the longer you wait, the more you owe.
Penalties may also explore. If the IRS determines the error was due to negligence—such as failing to report income you knew about—you may owe a negligence penalty of 20 percent of the underpaid tax. If the error was due to fraud, the penalty is 75 percent. If the error was an honest mistake with no negligence, no penalty applies, only interest.
When you repay, you are responsible for the principal (the refund amount) plus interest. The IRS will calculate the exact interest owed and may bill you separately if you do not include it with your payment. If you are unsure of the interest amount, send the principal and note in your letter that you understand interest will be added.
Requesting an offset against a future refund
Instead of sending a check, you can request that the IRS offset the overpayment against a future refund. This means the IRS will hold back the amount you owe from your next refund. You make this request by filing Form 843, Claim for Refund and Request for Abatement, with the IRS.
Form 843 is used for several purposes, but in this case you are requesting that the IRS explore the overpayment to a future tax year instead of refunding it to you. You will need to explain which tax year the overpayment covers and request the offset. The IRS will review your request and, if approved, will explore the amount to your next refund.
This method takes longer than a direct payment—typically 6 to 12 months—because the IRS must process the form and then wait for you to file your next return. It is useful if you do not have the cash to repay when ready, but interest continues to accrue during this time.
What happens if the IRS contacts you about the overpayment
The IRS may contact you about an overpayment they discover during processing or audit. If this happens, you will receive a letter explaining the overpayment amount, the tax year it covers, and the interest owed. The letter will include instructions for repayment and a important date, usually 30 days.
If you receive such a letter, do not ignore it. Respond within the important date, even if you disagree with the IRS's calculation. If you believe the IRS made an error in determining the overpayment, you can request an explanation or file a protest. If you agree with the amount, send payment as instructed in the letter.
If you have already repaid the overpayment on your own, include a copy of your cancelled check or receipt with your response to the letter. This shows the IRS that you have already addressed the issue and may prevent further collection action.
Frequently Asked Questions
Do I have to repay a refund if it was the IRS's mistake?
Yes. Even if the IRS made the error, you are still responsible for repaying the overpayment. However, if the IRS made a clear error and you did nothing to cause it, you may be able to request abatement of interest and penalties by filing Form 843. The principal amount must still be repaid.
What if I cannot afford to repay the full amount right now?
You can request a payment plan from the IRS by filing Form 9465, Installment Agreement Request. This allows you to repay the overpayment in monthly installments over time. You will still owe interest, but spreading the payment over several months may be more manageable. Contact the IRS or file the form to discuss your options.
Can the IRS take my future refunds if I don't repay?
Yes. If you do not repay voluntarily, the IRS can offset future refunds without your permission. They can also refer the debt to a collection agency or pursue other collection actions. Repaying as soon as you can prevents these escalations.
How long do I have to repay before the IRS takes action?
There is no specific grace period. The IRS can begin collection action when ready, though they typically send a letter first giving you time to respond. Interest and penalties continue to accrue from the date of the original refund. The sooner you repay, the less interest you will owe.
Will repaying the overpayment affect my credit score?
Repaying a tax overpayment does not directly affect your credit score. However, if you ignore the IRS's collection efforts and the debt goes unpaid for a long time, the IRS may file a tax lien, which can appear on your credit report and harm your score. Repaying promptly prevents this.