Employee Retention Credit
Form 907 and ERC: How to Preserve Your Right to Sue for a Disallowed Refund (2026)
The short answer: for a Form 907 ERC dispute, IRS Form 907 (Agreement to Extend the Time to Bring Suit) pushes back the 2-year deadline to sue for a disallowed Employee Retention Credit refund. You must sign it — and the IRS must countersign — before the 2 years from your disallowance notice expire, or the right to sue is lost for good.
You filed a Form 941-X, waited the better part of a year, and then a certified envelope showed up: Letter 105-C, your ERC claim disallowed. Appeals is dragging, the two-year clock is running, and someone told you to "just sign a Form 907." That feeling — that a hard deadline is closing while nothing is resolved — is real, and it's fixable if you act on the right date.
This guide explains exactly what a Form 907 ERC extension does, when signing it is the smart move, and when it quietly hurts you. The single most dangerous mistake is assuming your appeal is protecting the deadline. It isn't.
Below, the highlighted boxes on a real disallowance notice show exactly which date starts your two-year suit clock — most businesses read the wrong one and lose months they didn't know they were spending.
⏱ Your deadline: you have 2 years — 730 days — from the date the IRS mails your ERC disallowance notice to file a refund suit under IRC §6532(a). Form 907 is the only way to push that deadline out, and it must be fully signed by both you and the IRS before those 2 years run.
Why you're looking at Form 907 in the first place
Form 907 enters the picture only after the IRS has formally disallowed an ERC refund claim. If your business filed amended employment tax returns to claim the credit and the IRS said no, you likely received one of two letters.
A Letter 105-C fully disallowed your ERC, meaning the IRS rejected the entire claim. A Letter 106-C is a partial disallowance — the IRS allowed part and denied the rest. Some businesses first saw a CP320B notice that the claim was under review before the disallowance arrived.
Whichever letter you got, the moment it was mailed, a legal clock started: the two-year window to take the IRS to court over that refund. Form 907 is the tool that keeps that window open when you need more time.
What Form 907 actually does — and what it doesn't
Form 907 extends one specific deadline: the 2-year statute of limitations to file a refund suit. That's its entire job. It does not reopen your claim, force the IRS to reconsider, or guarantee a dollar of your credit.
Think of it as buying time to negotiate. If your case is sitting in an ERC disallowance appeal and the two-year suit deadline is approaching before Appeals rules, Form 907 lets you keep working the administrative track without being forced to file a lawsuit just to protect the deadline.
Here is what Form 907 cannot do:
- It does not obligate the IRS to allow your claim or even to keep talking.
- It does not extend your time to request an administrative appeal.
- It does not revive a deadline that already expired — it must be signed while the clock is still running.
- It does not work unless the IRS signs it too. Your signature alone is worthless.
The trap: appealing does not pause the clock
Filing a protest with IRS Appeals does not stop or extend the 2-year statute to bring suit. This is the mistake that costs businesses their entire ERC refund.
Many owners assume that because they responded on time and Appeals is actively reviewing, the deadline is frozen. It is not. The two-year suit clock under §6532(a) runs independently of any administrative process. If Appeals is still deliberating on day 731 and you never filed suit or signed a Form 907, the courthouse door closes — regardless of how strong your case was.
Only two things preserve the right to sue: filing the refund suit itself, or a fully executed Form 907 extending the deadline.
ERC disallowance-to-lawsuit timeline: what happens when
The clock starts on the mailing date of your disallowance notice and never stops on its own. Here is the sequence.
| Stage | What it is | Effect on the suit clock |
|---|---|---|
| Day 0 | IRS mails Letter 105-C or 106-C by certified mail | 2-year clock starts on the mailing date |
| First 30 days | Window to file an administrative protest to IRS Appeals | Clock keeps running — no pause |
| Months 1–24 | Appeals review, document requests, negotiation | Clock keeps running the entire time |
| Before day 730 | Sign Form 907 (both parties) or file a refund suit | Form 907 extends the deadline; suit locks in your rights |
| Day 731+ | No suit filed, no valid Form 907 | Right to sue for that refund is lost permanently |
What happens if you do nothing
If the 2 years expire with no lawsuit and no signed Form 907, your right to recover that ERC refund in court is gone — and it does not come back. This is the one deadline in the whole ERC process that is truly unforgiving.
- Day 0 — disallowance mailed. The certified letter goes out. Your clock is running whether or not you've opened the envelope.
- Through month 24 — the quiet stretch. You appeal, you send documents, you wait. Nothing warns you the deadline is approaching; the IRS does not send a reminder that your suit window is about to close.
- The final weeks — decision point. This is when Form 907 matters. If the case isn't resolved, you either extend or file a protective suit. Miss both and the next stage is permanent.
- Day 731 — the door closes. The statute expires. No court will hear a refund suit filed even one day late, and no later agreement can revive it. Whatever credit you were owed is legally uncollectible through litigation.
In 2026 this risk is sharper because IRS staffing was cut roughly 27% in 2025, so ERC cases move slowly through Appeals — but the statute of limitations doesn't slow down to match. A case can easily sit unresolved right up against the two-year wall.
Is your 2-year ERC suit deadline coming up?
Send us your Letter 105-C or 106-C. An experienced tax professional will pinpoint your exact suit deadline and tell you whether Form 907 or a refund suit protects you — free, confidential, and before the window closes.
Your paths after an ERC disallowance
After a disallowance you have three real routes, and each protects a different thing. Form 907 fits between them as a way to keep options open.
| Path | Deadline | What it preserves |
|---|---|---|
| Administrative appeal (protest to IRS Appeals) | ~30 days from the letter to request | A chance to reverse the disallowance without court — but not the suit clock |
| Sign Form 907 | Any time before the 2-year suit deadline | Extends the suit deadline while you keep negotiating |
| File a refund suit | Within 2 years of the mailing date | Locks in your day in court (U.S. District Court or Court of Federal Claims) |
Note where suit is filed: an ERC refund case goes to a U.S. District Court or the U.S. Court of Federal Claims, not the U.S. Tax Court. Because the ERC is claimed against employment taxes you already paid, the "full payment" rule that blocks some refund suits is generally satisfied — but the forum and the deadline are not optional.
When signing Form 907 is the right move — and when it isn't
Form 907 is the right call when your case is genuinely progressing and you need runway. If Appeals is actively engaged, you've submitted strong documentation, and both sides want more time to reach a resolution, extending the suit deadline avoids the cost and stress of a premature lawsuit.
It's the wrong call — or at least a risky one — in a few situations. Signing Form 907 does not force the IRS to do anything, so if the IRS has gone silent, an extension just gives away time while your money sits with the government. It can also signal that you'd rather keep talking than litigate, which can soften your negotiating position.
The biggest structural risk is timing. Because Form 907 is a mutual agreement, it isn't valid until an authorized IRS official countersigns. If you mail it at the last minute and the IRS doesn't sign before day 730, you have no extension and no filed suit — the worst of both worlds. Always submit early, and be ready to file a protective refund suit if the IRS won't countersign in time.
A worked example: how the two-year math plays out
Say your business claimed $180,000 in ERC across your 2021 quarters, and the IRS mailed a Letter 105-C fully disallowing it on March 1, 2024.
Your two-year suit deadline is March 1, 2026 — 730 days out. You file a timely appeal in April 2024, submit your government-order and revenue-decline documentation, and wait. By January 2026, Appeals still hasn't ruled. Your options:
- Do nothing and keep waiting: if March 1, 2026 passes with no ruling, no suit, and no Form 907, your $180,000 refund becomes legally uncollectible in court. Gone.
- File a protective refund suit before March 1, 2026: costs court filing fees and litigation expense, but permanently secures your right to have a court decide the claim.
- Sign Form 907 in January 2026, extending to (say) March 1, 2027: you and the IRS agree to a new deadline, Appeals keeps working, and you've avoided filing suit early — as long as the IRS signs before the original March 1, 2026 date.
This example is hypothetical, and the numbers are illustrative only — your dates and amounts come from your own notice. The point is the arithmetic: the deadline is measured from the mailing date, and it does not care how your appeal is going.
How to respond, step by step
- Find the mailing date on your Letter 105-C or 106-C — that certified-mail date is what starts your 2-year clock, not the day you opened it.
- Calculate the deadline by adding exactly 2 years to that date. Write it on your calendar in red; your appeal does not change it.
- Decide the strategy: if the case is unresolved and the deadline is near, request Form 907 to extend — otherwise prepare a protective refund suit.
- Submit Form 907 early so an authorized IRS official can countersign before the original 2 years expire. Both signatures are required.
- Confirm the extension in writing — keep the fully signed form showing the new expiration date, and calendar that date too. If the IRS won't sign, file suit before the original deadline.
If your ERC dispute also grew out of an examination, our guide on what to expect in an ERC audit walks through how those cases reach disallowance in the first place — and a free case review can confirm your exact suit deadline in minutes.
When you can handle this yourself — and when you shouldn't
You can often manage the early paperwork alone if the situation is simple. Calculating your two-year deadline from the mailing date, filing a timely protest, and requesting a Form 907 are administrative tasks a diligent owner or in-house bookkeeper can handle — especially if the disallowed amount is modest and you mainly need to preserve the deadline.
Experienced help changes the outcome when the stakes climb. If the disallowed refund is large, if the two-year deadline is close and you're weighing Form 907 against filing a protective suit, if multiple quarters or entities are involved, or if the IRS has stopped responding, the strategy decisions carry real money and no do-overs. A refund suit is litigation; the choice of forum, the full-payment mechanics, and the timing of Form 907 are places where a wrong guess is permanent.
The honest rule: preserving the deadline is doable yourself, but deciding how to preserve it — extend or sue — is where an experienced tax professional earns their fee.
Terms on your notice, decoded
- Form 907 (Agreement to Extend the Time to Bring Suit): a mutual, written agreement that extends the 2-year deadline to file a refund lawsuit.
- IRC §6532(a): the statute that gives you 2 years from the mailing of a disallowance notice to sue, and that expressly allows extension by written agreement.
- Letter 105-C / 106-C: the IRS notices that fully (105-C) or partially (106-C) disallow your ERC claim and start the suit clock.
- Form 2297 (Waiver of Statutory Notification of Claim Disallowance): the opposite of Form 907 — it starts the 2-year clock early by waiving the formal notice.
- Refund suit: a lawsuit to recover a disallowed refund, filed in U.S. District Court or the U.S. Court of Federal Claims — not Tax Court.
- Protective suit: a refund suit filed to beat the deadline even while negotiations continue, so the right to litigate isn't lost.
Form 907 and ERC questions, answered
What is IRS Form 907 used for with an ERC claim?
Form 907, Agreement to Extend the Time to Bring Suit, extends the 2-year deadline a business has to file a refund lawsuit after the IRS disallows its Employee Retention Credit. It keeps your right to sue alive while you keep negotiating or wait on IRS Appeals, instead of forcing you to file suit prematurely.
When does the 2-year clock to sue for a disallowed ERC start?
The 2-year period under IRC Section 6532(a) starts on the date the IRS mails your notice of claim disallowance — usually Letter 105-C (full) or Letter 106-C (partial) — by certified or registered mail. It is the mailing date printed on the notice, not the date you received or opened it.
Does appealing an ERC disallowance stop the 2-year deadline to sue?
No. Filing a protest with IRS Appeals does not pause or extend the 2-year statute to bring a refund suit. Many businesses lose their right to sue because they assumed an active appeal protected them. Only a signed Form 907 or actually filing suit preserves that right.
Does the IRS have to sign Form 907?
No. Form 907 is a mutual agreement, so it is only valid when both you and an authorized IRS official sign it before the original 2-year deadline expires. The IRS is not obligated to agree. Submit it early, and if the IRS declines to countersign, file your refund suit before the deadline.
What are the risks of signing Form 907 for an ERC dispute?
Form 907 does not obligate the IRS to reconsider or pay your claim — it only extends the window to sue. Relying on it can cost you the right to sue if the IRS never countersigns, or if the extension date is set too short. It also signals you would rather keep talking than litigate, which can affect leverage.
Where do I file a refund suit if the ERC deadline passes without Form 907?
If the 2 years expire with no suit filed and no valid Form 907, you generally lose the right to sue for that refund permanently. Before the deadline, an ERC refund suit is filed in a U.S. District Court or the U.S. Court of Federal Claims — not U.S. Tax Court, which does not hear employment-tax refund claims.
Is Form 907 the same as Form 2297?
No. Form 2297, Waiver of Statutory Notification of Claim Disallowance, starts the 2-year suit clock early by waiving the formal disallowance notice. Form 907 does the opposite — it extends the 2-year clock once it is running. They are different tools used at different moments.
Can I sign Form 907 after the 2 years already expired?
No. Form 907 must be signed by both parties before the original 2-year period runs out. Once the statute expires, it cannot be revived by a later agreement. That is why the mailing date on your disallowance notice is the single most important date to calendar.
Your next 24 hours
- Find the mailing date on your Letter 105-C or 106-C — the certified-mail date in the header. Add 2 years; that's your hard suit deadline.
- Gather your file: the disallowance notice, your Form 941-X claims, any appeal correspondence, and proof of the mailing date.
- Get a free case review: call (888) 825-7779 or use the 2-minute form. We'll confirm your exact deadline and whether Form 907 or a refund suit protects your ERC — while there's still time to act.
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. Statutes of limitation are strict and fact-specific — confirm your own deadlines with an experienced tax professional.
Primary sources: IRS — About Form 907, Agreement to Extend the Time to Bring Suit, the IRS Employee Retention Credit page, and the Taxpayer Advocate Service.