Erroneous Refund Basics: Why an Unexpected IRS Payment Is Not Good News
An erroneous refund is any money you receive from the Internal Revenue Service that you are not entitled to keep. It may be a refund you never claimed. Alternatively, it may be a refund that is larger than your return showed. Either way, the law treats the money as the government's, and you must send it back.
For a wealthy American living in Britain, an erroneous refund creates problems that domestic taxpayers rarely meet. The payment may sit unnoticed for months in an American account you seldom check. Furthermore, a dollar cheque posted to London is slow to arrive and hard to deal with. Meanwhile, interest may be running from the day the IRS paid.
At TaxYork, we prepare US UK tax returns for high-net-worth individuals, investors, investment bankers and company owners. Consequently, we reconcile every IRS payment against the return we filed. This guide explains what an erroneous refund is, how the IRS gets its money back and what you should do in the first three weeks.
What Counts as an Erroneous Refund
The IRS defines the term broadly. Its Internal Revenue Manual chapter on erroneous refunds, effective from October 2025, covers the receipt of any money from the Service to which the recipient is not entitled. Notably, the definition ignores fault. It applies whether the IRS made the mistake, your return contained an error or a third party caused the problem.
Intent does not matter either. You may have done nothing wrong, and the payment is still an erroneous refund. Therefore, the right question is never "who caused this?" at the outset. Instead, ask "is this money mine?" and act on the answer.
Why the Label Matters
Not every wrong refund is treated alike. The IRS sorts each erroneous refund into a category, and the category decides everything that follows. Specifically, it decides how the IRS may recover the money, how long it has and whether interest runs. Hence the first professional task is to work out which type you hold.
The Two Types of Erroneous Refund: Rebate and Non-Rebate
The Tax Court draws a line between a rebate refund and a non-rebate refund. The distinction sounds technical. However, it controls your rights, so every American abroad should understand it.
Rebate Refunds: The Tax Itself Was Understated
A rebate refund arises because the IRS recalculated your tax and concluded that you owed less. For example, your return may have claimed too large a foreign tax credit, and the IRS paid out on that basis. The refund was "correct" on the figures shown, yet the figures were wrong.
Here the IRS recovers the money by proving that you owe more tax. Under section 6211, a rebate counts in the deficiency calculation. As a result, the IRS must normally examine the return and issue a notice of deficiency. You then keep your full Tax Court rights. Additionally, the IRS must act within the usual assessment period, which is generally three years from filing.
Non-Rebate Refunds: A Processing Mistake
A non-rebate refund has nothing to do with your true tax liability. Instead, it results from a clerical or computer error. The IRS may pay the same refund twice, credit a payment to the wrong year or post another person's payment to your account. Your return was right, and the IRS simply paid out by mistake.
The IRS calls this a Category D erroneous refund. Importantly, it cannot assess the amount as tax. Therefore, it cannot use its normal collection machinery. The manual states that the IRS may not file a lien or serve a levy for this kind of debt. Recovery comes only through voluntary repayment, offset against other refunds or a civil lawsuit.
The Middle Ground: Overstated Payments
One further group deserves a mention. Sometimes a return overstates withholding or estimated tax payments, and the IRS refunds the difference. In that case, section 6201(a)(3) lets the IRS assess the overstated amount directly. No notice of deficiency is required. Consequently, this type moves faster than a rebate case and gives you fewer procedural rights.
Why Americans in Britain Receive an Erroneous Refund More Often
Cross-border returns are complex, and IRS systems were built for domestic filers. In our experience, six causes account for most cases among clients in Britain.
Payments Posted to the Wrong Year
Expats often make large estimated tax payments by international wire or through a US account. A January payment for the fourth quarter is easily posted to the new year, or to the old one. When the IRS then sees an unexpected credit on a filed year, it refunds it. Subsequently, the year the payment was meant for shows a shortfall. Our guide to estimated taxes for Americans abroad explains how these payments work.
Duplicate Refunds After a Lost Cheque
Post between America and Britain is unreliable. When a cheque fails to arrive, you ask the IRS to trace it on Form 3911. The IRS then issues a replacement. Occasionally, however, both payments reach you, or an amended return is processed twice. The second payment is a classic non-rebate erroneous refund.
Foreign Tax Credit and Exclusion Errors
The foreign tax credit and the foreign earned income exclusion interact in ways that software handles badly. For instance, a credit carryover may be used twice, or a credit may be claimed against excluded income. If the IRS pays out before anyone notices, the result is a rebate refund. Similarly, a taxpayer who files Form 2555 cannot claim the additional child tax credit, as the Schedule 8812 guidance confirms. Yet returns claiming both still slip through.
Withholding Credits Counted Twice
Wealthy clients often have American tax withheld at source. Examples include withholding on the sale of US property and on partnership income. These credits arrive on separate forms and are sometimes entered twice. Our article on FIRPTA withholding when selling US property shows how large the sums can be. A doubled credit of that size produces a substantial erroneous refund.
Spouses and Shared Accounts
Many of our clients have a British spouse who is not an American taxpayer. Payments made from a joint account may be credited to the wrong person, or to a joint period that does not exist. Moreover, a couple who switch between joint and separate filing can find one spouse's payment refunded to the other.
Identity and Banking Mistakes
Finally, some refunds belong to someone else entirely. A mistyped account number or a mixed-up taxpayer number can send a stranger's refund to you. If you see a deposit you cannot explain, do not assume it relates to your own return. Furthermore, an unexplained payment can signal identity theft, which needs separate action.
What to Do in the First 21 Days
Speed matters. The IRS asks you to return an erroneous refund immediately, and no later than 21 days after you receive it. The steps differ according to how the money arrived. The official source is IRS Topic 161, and we summarise it below with the adjustments that life in Britain demands.
If You Hold an Uncashed Cheque
Do not pay the cheque in. Instead, write "Void" in the endorsement area on the back. Then return it with a short note headed "Return of erroneous refund check" that explains why you are sending it back. Do not staple, bend or clip the cheque.
Taxpayers in a foreign country use the address the IRS gives for overseas filers on the Form 3911 page, which is currently its Austin refund inquiry unit. Additionally, send the envelope by a tracked international service and keep a copy of everything. A tracking record proves the date you acted.
If You Have Already Cashed the Cheque
You must repay the amount. The IRS accepts electronic payment through its payments page, or a cheque or money order in US dollars. On a paper payment, write "Payment of Erroneous Refund", the tax period, the account type and your taxpayer identification number. For an individual, the account type is "IMF". Include a brief explanation as well.
A British bank account creates a practical hurdle here, because the IRS wants dollars drawn on a US institution. Therefore, most of our clients repay from an American account or through one of the electronic options. Our guide to an IRS refund abroad with no US bank account covers the banking side in detail.
If the Money Arrived by Direct Deposit
Contact the bank that received the deposit and ask its Automated Clearing House department to return the payment to the IRS. Then tell the IRS what you have done. From Britain, use the international taxpayer service line on +1 267 941 1000, because the freephone numbers do not work from abroad.
Act even if you never look at the account. Many expats keep a dormant American account purely to receive refunds. Consequently, an erroneous refund can sit there for months, and interest may run for the whole period.
What Not to Do
Three shortcuts cause trouble. First, do not spend the money and plan to "net it off" on next year's return, because the IRS does not work that way. Second, do not file an amended return unless your original return was actually wrong. Third, do not convert the dollars into sterling. If you do, you carry the exchange risk until the day you repay.
Interest on an Erroneous Refund: The $50,000 Line
Interest is where the wealthy taxpayer is treated differently. The rules turn on who caused the mistake and how large the payment was.
When the IRS Made the Mistake
Under section 6404(e)(2), the IRS must abate interest on an erroneous refund until the date it demands repayment. That relief applies only if you did not cause the error in any way. It also applies only if the refund does not exceed $50,000.
Both conditions matter. If the IRS wrongly sends you $20,000, no interest runs until it writes to you. However, if it wrongly sends you $60,000, the relief is not automatic, and interest can run from the day of payment. High-net-worth clients routinely deal in sums above that line. Hence the 21-day discipline matters most for them.
When the Return Caused the Mistake
If you or your preparer caused the refund, the relief falls away entirely. Interest then runs from the refund date at the underpayment rate, whatever the amount. In addition, a rebate refund that stems from a return error may attract an accuracy penalty. Accordingly, an early voluntary correction is far cheaper than waiting for an examination.
The Demand Letter
For a non-rebate case, the IRS normally sends Letter 510C, headed "Refund in Error; Return Check". The date on that letter is the demand date for interest purposes. Therefore, note the date as soon as the letter arrives. A letter addressed to London may reach you two or three weeks after it was written.
How the IRS Recovers an Erroneous Refund and How Long It Has
The recovery route depends on the category. Each route has its own time limit, and the limits differ sharply.
Recovery by Assessment
For a rebate refund, the IRS examines the return and proposes a deficiency. You may respond, appeal and petition the Tax Court. If your notice of deficiency is addressed outside the United States, you have 150 days to petition rather than 90. Our guide to the notice of deficiency and the 150-day rule explains that process. Once the tax is assessed, the IRS has ten years to collect it and may use liens, levies and passport certification.
Recovery by Lawsuit
For a non-rebate erroneous refund, the government's main weapon is a civil suit under section 7405. The time limit sits in section 6532(b). The government must sue within two years after the making of the refund. Furthermore, that period extends to five years if any part of the refund was induced by fraud or by misrepresentation of a material fact.
The Supreme Court settled when the clock starts. In O'Gilvie v. United States, it held that the period runs from the date the taxpayer receives the cheque, not the date the government posts it. That ruling favours the government where post is slow. For a cheque that takes three weeks to reach Britain, the two years start three weeks later.
Interest in a Lawsuit
When the government sues, section 6602 adds interest at the underpayment rate from the date of the refund. Thus a taxpayer who waits to be sued repays the principal, the interest and, in practice, legal costs. Nobody gains from that outcome.
What Happens After Two Years
If two years pass without a suit, the government loses its right to sue for a non-rebate erroneous refund unless the five-year rule applies. However, relying on that limit is unwise. A misstatement on your return can open the longer window. Moreover, knowingly keeping money that belongs to the government can carry consequences well beyond tax. We never recommend waiting out the clock.
The UK Side of an Erroneous Refund
A dual filer must think about HMRC too. An American payment that comes and goes can disturb the British return in three ways.
Foreign Tax Credit Adjustments
Suppose the erroneous refund arose because your US return claimed too much credit, and the IRS later recovers the tax. Your final US liability has changed. If you claimed UK credit for US tax on American income, the UK figure may now be wrong as well.
British law imposes a duty here. Under section 80 of the Taxation (International and Other Provisions) Act 2010, you must notify HMRC within one year if an adjustment to foreign tax makes your UK credit excessive. Our guide to the foreign tax redetermination when HMRC changes your bill covers the mirror-image rule on the American side.
Interest the IRS Paid You
The IRS often adds interest to a refund. That interest is taxable income in America, and a UK resident must generally report it as foreign savings income too. If you later repay the interest with the refund, both returns need correcting. Therefore, tell your preparer about any interest element before the returns are filed.
HMRC's Own Version
HMRC has a parallel power. Under section 30 of the Taxes Management Act 1970, it may assess income tax or capital gains tax that it repaid when it ought not to have done. The amount is then treated as unpaid tax, so HMRC may collect it in the normal way. In contrast, the IRS cannot levy for a non-rebate refund.
The time limit is short as well. HMRC must generally assess before the end of the tax year following the one in which it made the repayment, unless an enquiry extends the period. If you believe HMRC has repaid too much, you can correct your Self Assessment return or contact HMRC directly.
Case Study: A Private Equity Partner and a $62,000 Deposit
The following illustrative case study uses a composite client. It shows how a processing mistake becomes expensive when nobody acts.
The Facts
Eleanor is a dual national US UK citizen and a partner at a private equity firm in London. In January 2026 she pays $62,000 of estimated tax for the fourth quarter of 2025. The IRS posts the payment to 2024 by mistake. Her 2024 return is already filed and settled, so the system treats the $62,000 as an overpayment.
On 14 May 2026 the IRS deposits $63,150 in her New York account. The sum is the $62,000 plus $1,150 of interest. Eleanor rarely checks that account. She notices the deposit on 2 June, assumes it relates to her fund distributions and converts it to sterling at $1.36. She receives £46,434.
The Problem
We find the deposit a week later while reconciling her IRS transcripts for the 2025 return. It is a non-rebate erroneous refund. Three costs are now running. First, the refund exceeds $50,000, so interest is not automatically abated even though the IRS caused the error. Second, her 2025 account is $62,000 short, which exposes her to an underpayment penalty on estimated tax. Third, she holds sterling and owes dollars.
The Outcome
On 9 June, 26 days after the deposit, Eleanor repays $63,150 electronically from her American account. Sterling has weakened to $1.32, so the dollars cost her £47,841. The exchange loss is £1,407. Interest on $62,000 for 26 days, at an assumed underpayment rate of 7 per cent, comes to about $309.
We then write to the IRS with the payment records. We ask it to restore the $62,000 to 2025 with the original January payment date. The IRS agrees, which removes the estimated tax penalty entirely. Had Eleanor left the deposit untouched until the IRS wrote to her, the interest alone would have passed $4,000 within a year, and the 2025 penalty would have stood until someone unpicked the error.
How TaxYork Can Help
We provide comprehensive US personal tax services and UK tax return preparation for wealthy clients with cross-border lives. Every year we reconcile your IRS account transcripts against the returns and payments we hold on file. As a result, we catch an erroneous refund before interest builds.
When one arises, we identify the category and prepare the repayment with the correct wording. We also correspond with the IRS on your behalf. Where the cause lies in an earlier return, we prepare the amended return, as explained in our guide to Form 1040-X for a wrong US expat return. Additionally, we update the UK return, so that your foreign tax credit claims stay consistent. For clients who dispute the IRS view, we handle related notices such as the math error notice.
Conclusion
An erroneous refund is never a windfall. The money remains the government's, and the cost of holding it grows with time. For Americans in Britain, slow post, dormant US accounts and exchange rates make that cost grow faster.
Therefore, check every IRS payment against your return on the day it arrives. If the figures do not match, establish the category, keep the money in dollars and return it within 21 days. Above all, make sure any payment the IRS misapplied finds its way back to the right year.
Contact Us
If you have received an erroneous refund, or a payment from the IRS that you cannot explain, contact us today. Email hello@taxyork.com or call 020 3488 8606. Please tell us the date and amount of the payment when you get in touch, because interest and time limits both run from that date.
Disclaimer
This article provides general information only and does not constitute tax, legal or financial advice. Tax rules change, and their application depends on your individual circumstances. The case study is illustrative and does not describe an actual client. Interest rates and exchange rates in the examples are assumptions. You should obtain professional guidance on your specific situation before acting. TaxYork accepts no liability for any loss arising from reliance on this article.