Refund deadlines are not only for taxpayers. When the IRS pays out money it should not have, the government has its own deadline to get it back by lawsuit. That deadline is short, and it matters to anyone who received a refund that later turns out to be a mistake.

This guide covers what the law treats as an erroneous refund, the two statutes that govern recovery suits and the timing rules that limit them.

What makes a refund erroneous

Section 7405 of the Internal Revenue Code recognizes two kinds of erroneous refunds.

  • Refunds after the limitation period. Section 7405(a) covers any portion of a tax refunded erroneously within the meaning of section 6514. Section 6514(a) says a refund is considered erroneous, and a credit void, if made after the expiration of the period for filing a claim unless a claim was filed within that period, or, where a timely claim was disallowed, if made after the period for filing suit expired unless suit was begun within that period.
  • Refunds otherwise erroneous. Section 7405(b) covers any portion of a tax that has been erroneously refunded where the refund would not be considered erroneous under section 6514. This is the broader category: a refund paid because of an IRS processing mistake, a miscalculation or a claim that should not have been allowed.

Section 6514 ties into the refund statute itself. A refund the IRS pays on a claim filed after the refund deadline is erroneous by definition. The Supreme Court in United States v. Brockamp, 519 U.S. 347 (1997), described sections 6514, 6532(b) and 7405 as part of how the Code reemphasizes the section 6511 limits.

The recovery suit

Section 7405 provides that such amounts may be recovered by civil action brought in the name of the United States. Section 7405(c) cross-references section 6602 for interest on erroneous refunds, and section 7405(d) cross-references section 6532(b) for the period of limitations.

This guide is about the lawsuit route and its deadline. Whether the IRS can use other procedures in a particular case, such as treating an amount as an underpayment and following assessment procedures, depends on the nature of the refund and is a separate legal question. The suit deadline is the one Congress wrote for the court action itself.

The deadline: two years, or five

Section 6532(b) says recovery of an erroneous refund by suit under section 7405 shall be allowed only if the suit is begun within 2 years after the making of the refund, except that the suit may be brought at any time within 5 years from the making of the refund if it appears that any part of the refund was induced by fraud or misrepresentation of a material fact.

Three points stand out. The clock runs from the making of the refund, not from when the IRS discovers the mistake. The base period is two years. And the five-year period requires that the refund was induced by fraud or by misrepresentation of a material fact. An IRS processing error that the taxpayer did not cause does not fit that description.

Why the cause of the refund matters

The difference between two years and five years usually comes down to how the refund happened. If the refund was the product of the IRS's own error, such as a duplicate payment, a misapplied credit or a computer glitch, the government generally has two years to sue. If the refund was induced by a false statement of a material fact on the claim or return, it may have five.

That is one more reason why refund claims must be accurate. Treasury Regulation 301.6402-2(b)(1) requires the grounds and facts in a claim to be verified under penalties of perjury. A claim that misstates a material fact can expose the taxpayer to the longer recovery period, on top of whatever other consequences follow.

Where erroneous refunds come from

Most erroneous refunds are not dramatic. They come from ordinary breakdowns in a system that processes enormous volumes. A payment posts twice. A credit lands on the wrong year. A claim is allowed after the claim period closed. An adjustment reverses an assessment that should have stayed in place. A refund goes out before an offset that should have applied.

In each of those situations, the refund looks like money you are owed until someone reconciles the account. That reconciliation can happen months or years later. The deadline in section 6532(b) is measured from the refund, so the reconciliation date does not restart anything. Section 7405(c) points to section 6602 for interest on erroneous refunds, which is another reason to address an obvious error sooner rather than later.

What to do if you receive a refund you did not expect

  • Do not assume it is yours to keep. Compare it to your return and any claim you filed.
  • If you believe it was paid in error, document why, and consider contacting the IRS in writing so the record shows you raised it.
  • Keep the funds identifiable until the question is resolved. Spending an obvious windfall makes the eventual conversation harder.
  • Calendar two years from the date of the refund. That is the base period for any recovery suit under IRC 6532(b).
  • If you receive a demand or a complaint, get advice before responding. Whether the refund was erroneous, whether the suit is timely and whether the five-year period applies are all questions with defenses.

When the refund was proper but late

Sometimes the IRS pays a refund on a claim that was filed after the section 6511 deadline. Under section 6514(a)(1), that refund is erroneous even if the overpayment was real. The taxpayer was owed the money in an economic sense, but the law barred the refund.

The same logic runs in the other direction for credits. Section 6514(b) says a credit against a liability is void if a payment on that liability would be an overpayment under section 6401(a). That rule protects taxpayers when the IRS tries to offset refunds against time-barred balances, as explained in the guide on payments after the CSED.

Defending a recovery suit

Start with timing. Find the date the refund was made and the date the complaint was filed. If more than two years passed, the government must show that the refund was induced by fraud or misrepresentation of a material fact to stay within five years. That is a factual showing, and the facts often favor the taxpayer when the mistake started inside the IRS.

Then look at whether the refund was actually erroneous. A refund that correctly reflects an overpayment, paid on a timely claim, is not erroneous under either subsection of section 7405. The refund lookback limits and the claim deadline guides explain how to test the original claim.

Finally, consider the procedure. A suit under section 7405 is filed in federal court, and the usual litigation deadlines apply. A complaint is not a letter to be answered when convenient.

The bottom line

For taxpayers, the practical rule is simple. Treat an unexpected refund as a question, not a gift, and keep the records that show how it came about. Those records decide which deadline applies if the government comes asking.

Under IRC 7405, the United States can sue to recover a refund that was erroneous under IRC 6514 or otherwise erroneous. Under IRC 6532(b), the suit must begin within 2 years after the refund was made, or within 5 years if any part of the refund was induced by fraud or misrepresentation of a material fact. The clock runs from the refund, not the discovery. Know your date, and keep accurate records of how the refund came about.