Updated October 24, 2026. Quick answer: Tax Topic 161 defines an erroneous refund as one you are not entitled to, or one for more than you are entitled to. What to do depends on whether the refund was a paper check not yet cashed, a cashed check or a direct deposit, and the topic sets a limit of 21 days for the check cases.
Quick reference
| Item | What the IRS topic says |
|---|---|
| What counts as erroneous | “It’s an erroneous refund if you receive a refund you’re not entitled at all or for an amount more than you’re entitled to.” |
| Uncashed paper check | “Write “Void” in the endorsement section on the back of the check.” |
| Time limit for returning a check | “Return the check immediately, but no later than 21 days, to the appropriate IRS location.” |
| Cashed paper check | “Write on the check/money order: “Payment of Erroneous Refund,” the tax period for which the refund was issued” |
| Direct deposit | “Contact the Automated Clearing House (ACH) department of the bank/financial institution where the direct deposit was received and have them return the refund to the IRS.” |
| Interest | “Interest may accrue on the erroneous refund.” |
The definition and the three cases
The topic opens with the definition: “It’s an erroneous refund if you receive a refund you’re not entitled at all or for an amount more than you’re entitled to.”
It then splits into three cases, each introduced by a heading line: “If your refund was a paper Treasury check and hasn’t been cashed:” then “If your refund was a paper Treasury check and has been cashed:” and “If your refund was a direct deposit:”
A paper check that has not been cashed
The topic lists four steps. The first is “Write “Void” in the endorsement section on the back of the check.”
The second is “Return the check immediately, but no later than 21 days, to the appropriate IRS location.” It explains the location with “The location is based on your state of residency.” and “Use the mailing address listed in the About Form 3911 page for the state you live in.”
The third is a handling warning: “Don’t staple, bend, or paper clip the check.” The fourth is “Include a note stating “Return of erroneous refund check” and give a brief explanation of the reason for returning the refund check.”
A cashed check or a direct deposit
For a cashed check, the topic says “Visit our payments page for ways to pay electronically.” If that is not possible, it says “If unable to pay electronically, submit a personal check, money order or cashier’s check immediately, but no later than 21 days, to the appropriate IRS location.”
It also states a consequence: “Cashing an erroneous refund check may result in interest due to the IRS.”
For a direct deposit, the topic gives two steps. One is the bank step in the table above. The other is “Call the IRS toll-free at 800-829-1040 (individual) or 800-829-4933 (business) (see telephone assistance for hours of operation) to explain why the direct deposit is being returned.”
The last paragraph covers a refund that simply differs from what you expected: “When the amount of the refund (paper check or direct deposit) is different than what was expected, indicating the IRS changed the amount, a notice explaining the adjustment is mailed to your address of record.” It adds “A toll-free telephone number is included on the notice in case you require further assistance.” For how refunds are entered on the return, see Form 1040 lines 34 to 36.
Where this comes from
This page describes the IRS page titled Topic no. 161, Returning an erroneous refund, Paper check or direct deposit, as served on irs.gov on October 24, 2026. The IRS page shows that it was last reviewed or updated on 16 Oct 2026. The IRS can change a topic after we read it, and the IRS page controls. General information, not tax or legal advice.
Common mistakes
- Assuming a cashed check ends the matter. The topic says “Cashing an erroneous refund check may result in interest due to the IRS.”
- Sending the check back without marking it. The topic says “Write “Void” in the endorsement section on the back of the check.”
- Stapling the check to a letter. The topic says “Don’t staple, bend, or paper clip the check.”
- Mailing it to any IRS address. The topic says “The location is based on your state of residency.”
- Treating a changed refund amount as an erroneous one. The topic says a “notice explaining the adjustment is mailed to your address of record.”
Related: IRS tax topics by number, Form 1040 lines 34 to 36, refund and direct deposit, Form 1040-X, Form 1040-X lines 18 to 23, overpayment and refund, Form 8888, and Refund check for a deceased taxpayer.
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Answer againSources
- IRS, Topic no. 161, Returning an erroneous refund, Paper check or direct deposit (irs.gov): https://www.irs.gov/taxtopics/tc161
- IRS, Tax topics index (irs.gov): https://www.irs.gov/taxtopics
Read from the IRS pages linked above on October 24, 2026. General information, not tax or legal advice. The IRS topic page and the instructions for your own form control, and your own facts decide the outcome.