An ERC audit defense review is a structured check of a business’s Employee Retention Credit claim, run before the IRS gets around to asking for one on its own timeline. It walks back through the eligibility test the original claim relied on, the documentation behind it and the math on the refund itself, so an employer knows exactly where things stand rather than finding out for the first time when an unexpected IRS letter arrives in the mail. For a credit this large, claimed by many businesses across nearly every industry, that kind of review has become a basic housekeeping step rather than an optional precaution.
The reason this still matters years after the pandemic officially ended comes down almost entirely to timing. The IRS is still actively auditing ERC claims, still sending disallowance letters and still has a legal window stretching years into the future to reopen a claim it hasn’t looked at yet. This post explains what an audit defense review actually covers, how the IRS’s enforcement effort has unfolded since the program’s peak, why a claim filed years ago can still be worth a second look today, and what actually happens once a disallowance letter shows up in the mail. None of this is legal or tax advice for a specific situation, and an employer with a live IRS notice in hand should be talking directly to a tax attorney or CPA about it.
TL;DR
- The ERC drew an unusual amount of fraud and aggressive marketing. Third-party “ERC mills” charged contingency fees, often 15% to 25% of the claim, and pushed eligibility theories the IRS later rejected, which is why the agency paused new claim processing in September 2023 and has been unwinding bad claims ever since, quarter by quarter, across millions of filed returns.
- Enforcement is still active, not winding down. The IRS has sent tens of thousands of disallowance letters, opened hundreds of criminal cases, and under the One Big Beautiful Bill Act now has a 6-year window to audit the highest-risk quarters, pushing some claims into scope through 2030 or later, well past when most businesses assume the matter is settled.
- Both voluntary disclosure programs have closed. The first program ended in March 2024 and the second in November 2024, so an employer who suspects a problem with a past claim no longer has that easy, discounted path, which makes reviewing a claim before trouble starts, and filing a properly built appeal if one becomes necessary, considerably more important than it was even a year earlier.
What an ERC Audit Defense Review Actually Is
A review like this works backward from the original claim to test whether it would hold up under an actual IRS examination. That means re-checking which eligibility test the business relied on, whether the underlying facts still support that test today, whether the wage calculation and employee count were done correctly, and whether the paperwork trail exists to prove all of it if an examiner asks. Many original ERC claims were prepared quickly, often by a third-party promoter working on commission, and a review is frequently the first time anyone has looked at the file with the specific question of whether it would actually survive scrutiny from someone outside the business.
The output of a good review isn’t just a single yes-or-no answer on eligibility, delivered without any further context. It typically identifies which quarters are solid, which are questionable and which look genuinely indefensible, along with a recommended path for each: keep the documentation organized and ready, consider a corrective filing, or prepare for the possibility of a dispute if the IRS challenges it. That triage matters because the right response to a weak claim that hasn’t been paid yet is different from the right response to a weak claim the business already cashed and spent, and different again from a strong claim that simply lacks organized proof.
Why the ERC Program Attracted So Much Scrutiny
The Employee Retention Credit was a payroll tax credit Congress created in 2020 and expanded in 2021 to help employers keep workers on payroll through pandemic disruptions, worth up to $5,000 per employee for 2020 and up to $7,000 per employee per quarter for the first 3 quarters of 2021. That generosity, combined with amended payroll return deadlines stretching into 2024 and 2025, created a long window for legitimate claims and an equally long window for aggressive promoters to exploit, sometimes at the same business’s expense.
Those promoters, often called ERC mills, advertised heavily on radio, television and online, promising businesses 6-figure refunds in exchange for contingency fees that commonly ran 15% to 25% of the claim amount, regardless of how much diligence went into determining whether the business actually qualified. Many built claims on eligibility theories the IRS never actually endorsed, particularly broad, vague assertions about supply chain disruption or a “partial suspension” of operations that wasn’t tied to any specific, identifiable government order. The volume and quality of these claims eventually overwhelmed the system: the IRS’s own review found the majority of late-filed claims showed signs of being improper, which is what pushed the agency toward a full moratorium on processing new claims in September 2023 while it worked to sort legitimate filings from the rest.
The Original ERC Eligibility Tests
The table below summarizes the core paths to ERC eligibility as Congress and the IRS defined them. A review starts here, because every other question that follows depends on correctly identifying which specific test the original claim was actually built on, since the rest of the analysis, and the strength of the whole claim, changes depending on that single answer.
| Eligibility Test | Threshold | Applies To |
| Government order suspension | Full or partial suspension of operations due to a government order, with more than a nominal impact on the business | All eligible quarters, March 2020 through 2021 |
| Significant decline in gross receipts | 50% decline versus the same 2019 quarter for 2020; 20% decline versus the same 2019 quarter for 2021 | All eligible quarters |
| Recovery startup business | A business that began operations after February 15, 2020, meeting separate revenue and structure requirements | Third and fourth quarters of 2021 only |
The IRS has been explicit that a government order needs to have caused more than a minor or speculative effect on operations to support a claim, which is exactly the standard that many promoter-built claims failed to meet once an examiner actually looked closely. A review checks the actual government orders in effect in the business’s jurisdiction during the claimed quarters, matches them against what the business was actually doing at the time, and confirms the gross receipts math ties out to the filed tax returns rather than to a promoter’s own recalculated figures built for the purpose of the claim.
How the IRS Enforcement Effort Has Unfolded
- The moratorium and the first disallowance wave. The IRS stopped processing new ERC claims in September 2023, then spent months digitizing and analyzing the backlog. In December 2023 it sent an initial round of more than 20,000 disallowance letters to businesses whose claims showed clear defects, such as entities that didn’t exist or had no paid employees during the claimed period.
- A second, larger wave in 2024. By August 2024 the IRS had sent roughly 28,000 more disallowance letters, which it estimated would prevent up to $5 billion in improper payments, while simultaneously resuming payment on tens of thousands of claims it judged legitimate. The agency reported that over 90% of those disallowance notices were accurate by its own assessment.
- Criminal investigations running in parallel. As of mid-2024, the IRS Criminal Investigation division had opened 460 criminal cases tied to ERC claims, and the agency’s Office of Promoter Investigations has continued receiving referrals about advisors and preparers who pushed questionable eligibility theories to clients who often had no way of independently verifying the claims being made to them.
- Enormous sums have already moved. By mid-2025 the IRS had processed nearly 5 million ERC claims and paid out roughly $235 billion, with the large majority of that money going out between 2022 and mid-2025, well after pandemic-era unemployment had already returned close to pre-pandemic levels across nearly every industry the credit was originally meant to help keep afloat.
This isn’t an enforcement effort that’s winding down. It’s one that shifted from processing and paying claims toward auditing and clawing back the ones that shouldn’t have been paid in the first place, and that shift is still actively underway across a caseload the agency has openly acknowledged it will take years to fully work through, quarter by quarter, before the backlog finally clears.
The 2 Voluntary Disclosure Programs, Now Both Closed
| Program | Window | Eligible Quarters | Repayment Required |
| First Voluntary Disclosure Program | Late 2023 through March 22, 2024 | 2020 and 2021 quarters | 80% of the credit received, no interest or penalties |
| Second Voluntary Disclosure Program (2.0) | August 15, 2024 through November 22, 2024 | 2021 quarters only | 85% of the credit received, promoter information disclosure required |
Both programs offered a genuinely attractive deal for an employer who suspected their claim was wrong: repay less than the full amount, avoid interest and penalties, and sidestep the accuracy-related penalties that would otherwise apply on top of the underlying repayment. Neither program offered protection from a future criminal investigation, and the second voluntary disclosure program specifically required participants to identify the advisor or preparer who helped with the original claim, which some employers found genuinely uncomfortable even as they went ahead and took the deal anyway. Both windows are now permanently closed, which means an employer discovering a problem with an old claim today no longer has this discounted, lower-friction path and instead has to work through ordinary correction or examination channels, typically at full repayment plus whatever penalties apply.
What Changed Under the OBBBA
- A 6-year statute of limitations for the riskiest quarters. The One Big Beautiful Bill Act, enacted in 2025, extended the IRS’s assessment window for third and fourth quarter 2021 ERC claims from the standard 3 years to 6 years, measured from the later of the claim date or the original filing deadline for that quarter. In practical terms, the assessment window for 2020 quarters had largely closed by April 2024, while many 2021 quarters now remain open for examination well into 2030 or 2031.
- Automatic disallowance of certain late claims. Claims for the third and fourth quarters of 2021 filed after January 31, 2024 are categorically disallowed under the new law, regardless of whether the underlying eligibility facts might otherwise have supported them, simply because the paperwork arrived after the statutory cutoff date Congress wrote into the law, with no exception for a claim that would have qualified on the merits.
- A dedicated accuracy penalty for bad ERC claims. Beyond simply repaying an improper credit plus interest, recent legislation introduced a 20% accuracy-related penalty specific to erroneous ERC refunds, which can rise to 40% where the IRS can show willful disregard of the rules, with civil fraud penalties of up to 75% still available in the most egregious cases and criminal referral reserved for documented intent to defraud.
These changes mean the practical risk calculus for an old ERC claim shifted meaningfully in 2025, in the actual number of years a business needs to keep its documentation ready and in the actual size of the penalty sitting on top of a bad claim if the IRS eventually finds it, sometimes years after the original refund was cashed and spent.
Disallowance Letters and What Each One Means
| Letter | What It Signals | What Happens Next |
| Letter 105-C | The ERC claim has been fully disallowed | Taxpayer generally has 2 years from the letter date to resolve the matter administratively or file suit in federal court |
| Letter 106-C | The ERC claim has been partially disallowed | Same administrative and litigation options apply, scoped to the disallowed portion of the claim |
| Letter 5859 | A proposed or final disallowance issued during an active examination | Typically includes a 30-day window to submit additional documentation or request an Appeals conference |
Receiving any of these letters starts a clock immediately, and the exact details of that clock matter enormously to how the business responds. The IRS’s current guidance gives a taxpayer a full 2 years from the date of a 105-C or 106-C to either resolve the dispute through the IRS’s own administrative process or file a lawsuit challenging the disallowance directly, a deadline that was previously just 30 days before the agency extended it in response to the sheer backlog of ERC appeals. Filing a written protest to request a conference with the IRS Independent Office of Appeals is still generally done within 30 days of the letter for the fastest path through that process, but missing that narrower window doesn’t end an employer’s options the way missing the outer 2-year deadline would, since other paths remain open.
Responding to a Disallowance: The Appeals Path
Filing the Protest For disputes involving more than $25,000, the IRS requires a formal written protest rather than an informal request. That protest needs to include the taxpayer’s name, address and the tax periods at issue, a clear statement requesting a conference with Appeals, a copy of the disallowance letter itself, an itemized schedule of the amounts in dispute, and a statement of facts signed under penalties of perjury laying out exactly why the business believes it qualified. Claims of $25,000 or less can use a simpler small-case request instead of the full formal protest.
What Appeals Officers Actually Weigh The IRS Independent Office of Appeals operates separately from the examination teams that issue disallowances, and its officers apply what’s known as the hazards of litigation standard, essentially asking how the case would likely come out if it went to court rather than simply defending the examiner’s original position. That gives Appeals meaningfully more flexibility than the examination stage, which is why a well-documented protest that lays out specific government orders, specific dates and a clear legal argument tends to fare far better in practice than a generic objection with nothing concrete behind it.
How Long the Process Actually Takes Appeals has been dealing with a genuine flood of ERC-related protests, and recent reporting put the average time to resolve a case through the Office of Appeals at 337 days, well over 11 months. Because that clock runs inside the very same 2-year statutory window a taxpayer has to file suit if the administrative process doesn’t resolve things in time, the IRS announced in April 2026 a new, faster way for certain taxpayers to request additional time for Appeals review specifically so they aren’t forced into premature federal litigation simply to preserve their rights before the underlying deadline quietly runs out.
What an Audit Defense Review Actually Checks
- The eligibility test and the facts behind it. A review confirms which of the statutory tests, government order suspension, gross receipts decline or recovery startup status, the original claim relied on, then checks that test against contemporaneous records rather than the promoter’s own retroactive narrative of what happened at the time the claim was originally prepared and submitted to the IRS.
- The wage and headcount calculation. Errors in which employees were included, which wages were counted, and how the wage calculation and employee count were done per employee per quarter are common, particularly on claims prepared quickly by a promoter working on volume rather than precision, since speed and accuracy rarely go together when a preparer is handling hundreds of claims at once.
- The documentation trail. A review inventories what evidence actually exists to support the claim, specific government orders, revenue records tied to filed tax returns, payroll records, and identifies gaps that need to be filled or flagged as a genuine weakness well before an examiner ever gets the chance to find those same gaps first and use them against the claim.
- Statute of limitations exposure. Because the assessment window now runs as long as 6 years for the highest-risk 2021 quarters, a review calculates exactly when each specific quarter’s exposure closes, which shapes how urgently any corrective action actually needs to happen relative to that specific deadline and how much runway actually remains before the business needs to act on it.
- Promoter and preparer risk. A review looks at who prepared the original claim and under what fee arrangement, since a contingency-fee promoter relationship is itself a red flag the IRS has specifically said it watches for when deciding which claims deserve a closer look during the examination selection process, long before the business itself ever hears from an examiner.
Taken together, this is less a single yes-or-no eligibility opinion and more a full risk map of the claim, built so the business, and whoever is advising it, knows exactly where the strong ground is and where it isn’t, well before the IRS makes that determination unilaterally, on its own timeline, without any input from the business at all.
What a Review Looks Like in Practice
Most audit defense reviews follow a broadly similar sequence from start to finish, even though the specific findings differ quite a bit from one business to the next. The steps below describe how a thorough review typically unfolds, from the first documents requested to the final written recommendation delivered to the business once the underlying analysis is complete.
- Gathering the original claim file. This starts with the filed Forms 941-X, the calculation worksheets behind the credit amount, and any memo or eligibility analysis the original preparer produced, since the review has to understand exactly what was claimed and on what basis before it can meaningfully test whether that basis would actually hold up under real scrutiny from an examiner.
- Reconstructing the eligibility facts. For a government-order claim, this means identifying the specific orders in effect in the relevant jurisdiction during each claimed quarter and lining them up against what the business was actually doing at the time. For a gross-receipts claim, it means confirming the comparison quarters and the underlying revenue figures tie directly back to the business’s actual filed tax returns.
- Recalculating the credit independently. Rather than accepting the original preparer’s numbers, a thorough review rebuilds the wage and headcount calculation from payroll records, checking employee counts, qualified wages and any interaction with PPP loan forgiveness that might reduce the credit amount, since double-dipping between the 2 programs on the same wages turned out to be a common and genuinely costly error.
- Assessing the statute of limitations for each quarter separately. Because different quarters can carry different assessment deadlines depending on when they were claimed and which year they fall in, a review maps out exactly when the IRS’s window to examine each specific quarter closes, rather than treating the whole multi-quarter claim as a single undifferentiated block with one uniform deadline attached to it.
- Delivering a written risk assessment. The final output typically ranks each quarter by confidence level, flags specific documentation gaps that still need to be filled, and lays out concrete next steps, whether that’s simply organizing existing records, considering a corrective amended filing, or preparing contingency plans in case an examination letter eventually shows up in the mail months or years from now.
The specific findings vary enormously from one business to the next, since a claim built on a well-documented, specific government order looks nothing like one built on a vague supply-chain disruption theory, even though both might have used the same eligibility test on paper. That’s exactly why someone actually has to read the underlying facts rather than run the claim through a generic checklist.
Promoter Risk and Why the Preparer Matters
Who prepared the original ERC claim has become a genuinely significant factor in how the IRS approaches an examination, well beyond a detail worth noting in passing. The agency’s Office of Promoter Investigations has been actively collecting referrals about advisors and preparers who pushed aggressive or unsupportable eligibility theories, and the second voluntary disclosure program specifically required participants to disclose which promoter or preparer assisted with their claim, a condition that functioned as a data-gathering exercise for the IRS as much as a compliance requirement for the taxpayer.
A contingency-fee arrangement, where the preparer’s payment depended on the size of the refund rather than a flat fee for the work performed, is itself something the IRS treats as a risk signal, since it creates a direct financial incentive for the preparer to stretch the eligibility facts rather than assess them neutrally. An audit defense review looks closely at this history, not to assign blame, but because understanding exactly what theory the original preparer relied on, and how aggressively they applied it, is often the fastest way to identify which parts of a claim are genuinely defensible and which parts were built on an argument the IRS has already rejected in other cases.
Penalty Exposure If a Claim Is Found Improper
| Penalty Tier | Rate | When It Applies |
| Standard accuracy-related penalty | 20% of the improper refund | Applies to most disallowed or recaptured ERC claims beyond simple repayment and interest |
| Willful disregard penalty | 40% of the improper refund | Applies where the IRS can show the taxpayer knowingly disregarded the eligibility rules |
| Civil fraud penalty | Up to 75% of the improper refund | Reserved for the most egregious cases involving clear indicators of fraud |
| Criminal referral | Prosecution, not a percentage penalty | Reserved for documented intent to defraud, handled through IRS Criminal Investigation |
These penalties stack on top of the underlying repayment obligation and accrued interest, which is why the math on an improper ERC claim gets significantly worse the longer it goes uncorrected. A claim caught and corrected on the employer’s own initiative, before an IRS letter arrives, generally has more options and lower exposure than the same claim discovered during an active examination, which is the core practical argument for running a review now rather than waiting to see whether a letter shows up.
Why Employers Still Need a Review Even Years Later
The math on urgency is straightforward once the statute of limitations is laid out plainly. Assessment windows for many 2020 ERC quarters had already closed by April 2024 under the standard rules, but the extended 6-year window for third and fourth quarter 2021 claims means the IRS retains the legal authority to open an examination on those quarters well into 2030 or 2031. An employer who claimed the ERC for those specific quarters, particularly through a promoter working on contingency, is sitting inside an active audit window right now, whether or not they’ve received any communication from the IRS yet.
Waiting for a letter before organizing documentation or reassessing eligibility is a genuinely costly strategy, since the options available shrink considerably once an examination is already underway rather than anticipated. A business that reviews its claim on its own initiative can still choose to correct a problem on its own terms, gather documentation while records and institutional memory are still available, and walk into any eventual IRS contact already prepared rather than scrambling to reconstruct payroll and revenue records under a 30-day response deadline. Given how much money the program paid out, how aggressively it was marketed, and how long the IRS’s legal window to look back now extends, an audit defense review works best as routine upkeep rather than a reaction to a problem that already happened. For many employers who claimed the credit during its most heavily promoted period, it’s simply become a standard part of keeping the business’s tax position in order.
FAQs
What exactly is an ERC audit defense review?
It’s a structured reassessment of an existing Employee Retention Credit claim, checking the original eligibility test, the wage and headcount calculations, and the supporting documentation against what an actual IRS examination would demand. The goal is identifying strengths and weaknesses in the claim before the IRS does, not simply confirming the original refund amount.
Why is the IRS still auditing ERC claims years after the program ended?
The One Big Beautiful Bill Act extended the assessment window for third and fourth quarter 2021 claims from 3 years to 6 years, keeping many of those claims open for examination into 2030 or 2031. Combined with the sheer volume of claims filed, nearly 5 million processed by mid-2025, the IRS’s audit and enforcement work is still actively underway rather than winding down.
Are the ERC voluntary disclosure programs still open?
No. The first program closed in March 2024 and the second, more limited program closed on November 22, 2024. An employer who suspects a problem with a past claim today no longer has access to the discounted repayment terms those programs offered and has to work through ordinary correction or examination channels instead, generally at full repayment, plus whatever interest and penalties have accrued in the meantime.
What’s the difference between Letter 105-C and Letter 106-C?
Letter 105-C notifies a taxpayer that their ERC claim has been fully disallowed, while Letter 106-C signals a partial disallowance covering only part of the claimed amount. Both currently carry a 2-year window from the letter date to resolve the matter administratively or file suit in federal court, though a formal protest to request an Appeals conference is generally filed within 30 days for the fastest path.
How much can penalties add to an improper ERC claim?
Beyond repaying the credit itself plus interest, a standard accuracy-related penalty of 20% typically applies, rising to 40% where the IRS finds willful disregard of the eligibility rules. Civil fraud penalties of up to 75% are reserved for the most serious cases, and documented intent to defraud can result in a criminal referral rather than a financial penalty alone.
Does using a contingency-fee ERC promoter increase audit risk?
Yes, in practice it does. The IRS has treated contingency-fee arrangements as a risk indicator, since they create a financial incentive for the preparer to stretch eligibility facts rather than assess them neutrally, and the agency’s Office of Promoter Investigations has been actively collecting referrals about advisors who pushed aggressive theories. A review of the original preparer’s methodology is a standard part of assessing a claim’s actual risk.
What happens if an employer ignores an ERC disallowance letter?
Missing the response deadlines on a disallowance letter doesn’t make the issue disappear. Once the administrative and litigation deadlines pass without action, the proposed disallowance typically becomes final, and the employer loses the ability to challenge it through the normal appeals and court process, leaving the IRS free to pursue collection on any amount already paid out.
Is it too late to fix an old ERC claim if the refund was already received and spent?
It’s generally not too late to address a problem, though the options narrow once a refund has already been cashed and the voluntary disclosure programs have closed. With the standard correction and examination channels still available, and interest and penalties accruing the longer a known issue goes unaddressed, a review that identifies the problem sooner rather than later still meaningfully improves an employer’s position compared with waiting for an IRS letter to arrive first.
