IRS Audits & the Employee Retention Credit

IRS ERC Audit: What to Expect When Your Employee Retention Credit Is Examined (2026)

By Angeline Balsitis, EA · Reviewed by Melissa Ly, Chief Tax Officer · Updated July 5, 2026 · Editorial Standards

You claimed the Employee Retention Credit, the refund came through, and now an IRS letter is asking for payroll registers, quarterly revenue, and the shutdown orders that made your business eligible. The pit in your stomach is real — but an ERC audit is a document exercise, not a verdict. If your claim is legitimate and you can show it, you win it.

The businesses that lose ERC audits usually lose them the same way: they let a promoter file the claim, never built an eligibility file, and then ignored the first request. This guide walks you through exactly what the IRS asks for, why claims get disallowed, what the penalties look like, and how to prepare so the paperwork works for you instead of against you.

Below, the highlighted boxes on the sample Information Document Request show exactly which line carries your real response deadline — most people read the mailing date and miss the date that actually starts the clock.

Why your ERC claim is being audited

The IRS is examining ERC claims because a wave of aggressive promoters filed credits for businesses that never qualified. These "ERC mills" advertised on the radio, charged a percentage of the refund, and pushed one-size-fits-all eligibility memos — then vanished once the money landed. The IRS paused new claim processing in late 2023 and opened a broad examination effort to claw back improper refunds.

Being selected does not mean the IRS has decided you were wrong. Selection is driven by risk signals: a claim size that looks large for your payroll, a preparer the IRS is scrutinizing, a government-order argument that many businesses over-applied, or simple statistical sampling. A well-documented claim survives the same audit that sinks a promoter-driven one.

If your first contact was a notice rather than a full examination letter, read our companion guide to Notice CP320B, "your ERC claim is under review," which is the softer front end of this same process.

How an ERC audit actually unfolds

An ERC audit is a defined sequence, and knowing the stages tells you where you stand. It typically starts with a contact letter and an Information Document Request and ends either with a "no change" letter or a proposed disallowance you can contest.

1. Initial contact letter — the IRS notifies you the ERC quarters are under examination and assigns an examiner or campus unit.
2. Information Document Request (Form 4564) — the list of records you must produce, with a response date usually 30 days out.
3. Review and follow-up IDRs — the examiner reviews what you sent and often issues additional requests to fill gaps.
4. Form 886-A — a written explanation of the IRS's position and proposed adjustment if it intends to disallow all or part of the credit.
5. Letter 105-C or 106-C — the formal full disallowance (Letter 105-C) or partial disallowance (Letter 106-C) of your refund claim.
6. Appeal or refund suit — you can protest to IRS Appeals and, if needed, file a refund suit in court. See how to appeal an ERC disallowance.

What documents the IRS requests in an ERC audit

The IRS builds its ERC audit around three eligibility pillars: your payroll, your gross-receipts decline, and any government order that suspended your operations. Every document request maps to one of those pillars — and to proving you did not double-count wages.

Here is what the Information Document Request will ask for, and why each item matters.

Two documentation points trip up the most businesses. First, the gross-receipts test compares each 2020 or 2021 quarter to the same quarter in 2019 — 2020 required roughly a 50% decline, 2021 roughly a 20% decline — so you need clean quarterly revenue for both years, not annual totals. Second, a government-order claim must point to an actual order that more than nominally suspended your operations; "business was slow" or "customers stayed home" is not, by itself, a qualifying suspension.

Common reasons the IRS disallows an ERC claim

Most ERC disallowances come down to a handful of repeat failures, and nearly all of them are documentation and eligibility problems the business could see coming. Knowing the list lets you pressure-test your own claim before the examiner does.

Penalties and interest exposure if your ERC is disallowed

A disallowed ERC is not just "give the money back" — the IRS charges interest from the day it paid you, and it can layer penalties on top. Understanding the exposure tells you how hard the claim is worth defending.

• Repayment of the credit — the full disallowed amount becomes a balance due.
• Interest — accrues from the date the refund was issued to you, not from the audit date, so a claim paid in 2022 has years of interest attached.
• Accuracy-related penalty (IRC §6662) — 20% of the underpayment for negligence or a substantial understatement.
• Erroneous refund claim penalty (IRC §6676) — 20% of the excessive refund amount when there was no reasonable basis for the claim.
• Civil fraud penalty (IRC §6663) — up to 75% when the IRS shows intentional wrongdoing; reserved for the worst cases.

Reasonable-cause relief can knock out some penalties if you acted in good faith and relied on complete, accurate professional advice — but "an ERC mill told me I qualified" is a weak reasonable-cause argument when the mill never verified your facts. To sanity-check what interest and penalties on a disallowance might total, our IRS penalty and interest calculator estimates the running cost (it estimates only — the examiner's numbers govern).

Worked example: what a disallowed ERC actually costs

Say your business claimed $180,000 in ERC across three 2021 quarters, and the refund was paid in mid-2022. On audit, the IRS finds the government-order argument does not hold and disallows the full amount.

You now owe the $180,000 back. Interest running from mid-2022 through a 2026 assessment could add roughly $35,000–$45,000 depending on the rate periods. If the IRS also asserts a 20% accuracy penalty, that is another $36,000. Total exposure lands near $250,000–$260,000 — on a credit you may have paid a promoter 20% of to obtain. That arithmetic is why documentation, and challenging a weak disallowance, matters so much.

If a disallowance leaves you with a five- or six-figure balance you cannot pay at once, the same resolution paths apply as any large tax debt — see, for example, options when you owe the IRS $80,000 or owe the IRS $90,000.

How far back the IRS can audit your ERC

The assessment window is what makes 2026 the peak year for ERC audits. For 2020 and the first two quarters of 2021, the IRS generally has three years from when the return was filed to assess additional tax. For the third and fourth quarters of 2021, Congress extended that period to five years. Fraud carries no statute of limitations at all.

Those windows are also why deadlines cut both ways. If a disallowance is heading toward the two-year limit on your right to sue for the refund, a business may be asked to sign an extension — our guide to Form 907 and extending the time to bring an ERC suit explains when signing protects you and when it simply hands the IRS more time.

How to respond to an ERC audit, step by step

The businesses that come through ERC audits cleanly do the same six things in the same order. Follow them and you turn a stack of requests into an organized defense.

1. Read the letter and calendar the deadline — know whether you have an IDR, a CP320B, or a 105-C, and put the response date (usually 30 days) on your calendar.
2. Rebuild your eligibility file — gather payroll detail, Forms 941 and 941-X, quarterly gross receipts, and the exact government orders you relied on.
3. Reconcile PPP and wage overlap — confirm no ERC wages were also used for PPP forgiveness, owner wages, or other credits.
4. Answer the IDR item by item — respond to each numbered request with labeled documents and a short cover memo tying your facts to the rule.
5. Request more time if you need it — ask the examiner in writing before the deadline rather than sending an incomplete package.
6. Bring in representation for disallowances — if the IRS proposes cutting the credit, get a professional review before the appeal deadline passes.

When you can handle an ERC audit yourself — and when you shouldn't

You can often handle a clean, well-documented ERC audit on your own. If a knowledgeable preparer built your claim, your gross-receipts decline is clearly met with quarterly numbers you can produce, or your government order plainly suspended a meaningful part of your operations, answering the IDR completely and on time may be all it takes to earn a "no change."

Experienced help changes outcomes in the harder cases: large dollar amounts, a promoter-prepared claim with no supporting file, a government-order theory the IRS is challenging, a proposed penalty, or a full or partial disallowance you need to appeal. In those situations the legal standards, the burden of proof, and the deadlines are unforgiving, and a strong written response early can prevent a fight later. Never let the mill that filed the claim also "defend" it — many charged contingent fees and produced memos that fold under examination.

Terms on your ERC audit letter, decoded

• Information Document Request (Form 4564) — the IRS's itemized list of records you must produce, with a response deadline.
• Form 886-A — the examiner's written explanation of the IRS position and the proposed adjustment.
• Letter 105-C — a formal full disallowance of your refund claim.
• Letter 106-C — a formal partial disallowance; the IRS allows some of the credit and denies the rest.
• Gross-receipts test — the eligibility path based on a quarterly revenue decline versus 2019.
• Partial suspension — the eligibility path based on a government order that more than nominally limited your operations.
• Assessment period — the window (3 or 5 years) in which the IRS can charge back a disallowed credit.

ERC audit questions, answered

Your next 24 hours

You do not have to solve the whole audit today. Do these three things and you convert the anxiety into a plan.

1. Find the response date on your Information Document Request or notice — the date that starts the 30-day clock, not the mailing date.
2. Gather the eligibility file — payroll registers, Forms 941 and 941-X, quarterly gross receipts for the claim quarters and 2019, the government orders, and your PPP forgiveness records.
3. Get a free case review before you respond — send us the letter through the 2-minute form or call (888) 825-7779, and an experienced tax professional will map your response before the deadline hits.

This guide is general information, not tax or legal advice for your specific situation. Eligibility for IRS programs depends on individual facts and circumstances; no outcome is guaranteed.

Related guides: ERC Disallowance Appeal: The Appeals Route and Your Protest Letter · Form 12203 Appeal Request: How the Small-Case Appeal Works · How Far Back Can the IRS Audit? The 3-Year, 6-Year, and No-Limit Rules · IRS Audit No Receipts: What to Do in 2025 · IRS Audit Reconsideration: How to Reopen an Audit