S-Corp ERC Audit: The New Six-Year Lookback Window
If your S-corp claimed the Employee Retention Credit for the second half of 2021, the window for an S-corp ERC audit just got longer. A provision in the One Big Beautiful Bill Act pushed the IRS’s time to assess those claims from five years to six, and the agency still has roughly 13,000 claims — across every ERC quarter — moving through review, audit, and appeals as of early October 2026. If your claim hasn’t been examined yet, it still can be — and if it gets disallowed, the fallout doesn’t stop at the entity level. It flows straight through to every shareholder’s K-1.
The Six-Year Lookback on Your S-Corp ERC Audit Risk
For ERC claimed on wages paid after June 30, 2021, the assessment period used to be five years from your filing date; it’s now six. Section 70605(e) of the One Big Beautiful Bill Act rewrote 26 U.S.C. §3134(l) to give the IRS six years — instead of the five those claims already carried — measured from the latest of the date your original 941 was filed, the date it’s treated as filed under §6501(b)(2), or the date you filed the claim for credit or refund itself. That change applies to any assessment the IRS makes after July 4, 2025, which covers essentially every open exam of a late-2021 claim today.
In practice, that means a 2021 third-quarter claim filed in early 2024 can still be assessed into 2030. The six-year clock reaches only credits claimed under §3134 — wages paid July 1 through September 30, 2021, plus the fourth quarter of 2021 for recovery startup businesses. ERC for 2020 and the first two quarters of 2021 was claimed under the CARES Act and stayed on the standard three-year assessment clock of §6501, which has generally already run for those quarters absent fraud or a substantial omission. But if your S-corp claimed a late-2021 ERC and hasn’t heard from the IRS, that silence isn’t a clean bill of health — it’s a longer runway for the agency to look.
13,000 ERC Claims Are Still Moving Through the IRS Pipeline
The IRS isn’t finished working through the backlog. As of the week ending October 3, 2026, the agency reports roughly 13,000 ERC claims still open across every stage of the process: 750 under initial review, 2,300 pending payment or disallowance, 3,000 under active audit, 5,400 waiting on a taxpayer’s response to a disallowance, and 1,500 sitting with the Independent Office of Appeals. The IRS’s ERC page says it updates these figures monthly, which is itself a signal — this isn’t a program the agency considers closed.
If your S-corp’s claim falls into any of those buckets, treat it as live. An audit notice, a disallowance letter, or an appeals conference can each still be ahead of you, not behind you.
The January 31, 2024 Cutoff for 2021 Claims Already Hit
A separate rule closed the door on new claims for the third and fourth quarters of 2021. Section 70605(d) of the Act bars the IRS from allowing or refunding any ERC for those two quarters if the claim was filed after January 31, 2024 — a bar that’s been in effect since July 4, 2025. It doesn’t touch claims filed on or before that date, and it doesn’t reach 2020 or earlier-2021 quarters at all; it’s narrow, but absolute where it applies.
If you’re on the receiving end of a disallowance under this rule, you still get appeal rights the same way you would for any other disallowance. The IRS lays out the process in its FAQ on the provision and in its guide to Letter 105-C: you can request an administrative appeal, go to the Independent Office of Appeals, or file suit if you believe your claim was timely and wrongly disallowed.
A Disallowed ERC Claim Doesn’t Stop at the 941-X
Claiming the ERC meant giving up a matching wage deduction. When your S-corp filed Form 941-X for the credit, the rules required reducing the wage deduction on that year’s Form 1120-S by the same amount. That reduced deduction flowed through to every shareholder’s K-1 and raised their taxable income for the year, the same way any other disallowed deduction would.
If the IRS later disallows the credit itself, you’re entitled to get that deduction back — and for late-2021 claims, the law gives you time to actually claim it. Under the amended §3134(l), when the IRS assesses tax attributable to a credit claimed under §3134, the statute of limitations for amending your return to restore the wage deduction doesn’t expire before that assessment period does. In practice, that means if an exam reopens one of those claims, you can still amend the 1120-S and reissue corrected K-1s for the wage deduction you gave up, even years after the normal three-year refund window would have closed. (For 2020 and early-2021 credits, the ordinary refund limitations of §6511 still apply, so timing is tighter.) For how a correction like this interacts with a shareholder’s basis, see our guide to S-corp shareholder basis; for how an entity-level adjustment multiplies across every owner’s Form 1040, see our S-corp audit guide.
If You Haven’t Cashed the Check, Withdrawal Is Still Open
If your S-corp’s ERC hasn’t been paid yet, or you got a check but haven’t deposited it, you can still walk away from a weak claim without an audit. The IRS’s ERC withdrawal program remains open and lets you pull back an unpaid or uncashed claim — avoiding the audit, the repayment, and the penalties and interest that come with a disallowance later. It closes once the money has actually been cashed or deposited; before that, it’s the cleanest way out of a claim you’re no longer confident in.
What to Do With an Open S-Corp ERC Claim
Pull your original Form 941-X and the Form 1120-S for the year it affected, and check two things: which quarters the claim covers, and when it was filed. A third- or fourth-quarter 2021 claim filed after January 31, 2024 was already blocked; a timely late-2021 claim is fair game for an S-corp ERC audit for up to six years from filing, while 2020 and early-2021 claims generally closed with the standard three-year window. Then look at your eligibility the way the IRS’s current signs of an incorrect claim describe it, not the way the promoter who filed it originally described it.
An ERC claim that was legitimate when it was filed doesn’t need anything from you now beyond good records. One that was marginal is worth a second look before the IRS gets to it first — a six-year clock gives them plenty of time, and a voluntary correction now is almost always cheaper than an audit later. Reach out to our team if you want a second set of eyes on an open claim.