Abatement versus refund
IRC 6404(a) lets the IRS abate the unpaid portion of an assessment that is excessive, untimely or erroneous, and IRM 20.1.1.4 confirms a taxpayer can challenge a penalty “either before or after it is paid”. Once the penalty is paid, though, removing it means creating an overpayment, and an overpayment can be refunded only under IRC 6511. IRM 25.6.1.10.1 puts it this way: a filing labeled as an abatement request may also be a claim for the return of a paid assessment, and that claim “is subject to the requirements of IRC 6511.”
The practical consequence is stark. IRM 25.6.1.10.1.1 tells employees: “Penalties and interest should not be abated on a full paid account if the overpayment created is barred from refunding because the RSED has passed”, and it applies that rule whether the request is based on reasonable cause or First Time Abate. A client who paid a penalty years ago and only now asks about FTA may be out of time even with a strong case. TIN Compliance has a payer-focused comparison of abatement requests and refund claims for information return penalties.
The 6511 deadline and the lookback cap
IRC 6511 has two parts, and the IRM calls them prongs: a date by which the claim must be filed, and a limit on how much can be refunded based on when the payments were made.
| Rule | Statute | How it works |
|---|---|---|
| Filing deadline | IRC 6511(a) | Within 3 years from the time the return was filed or 2 years from the time the tax was paid, whichever is later; if no return was filed, within 2 years of payment |
| Cap, claim filed within the 3-year period | IRC 6511(b)(2)(A) | Refund limited to amounts paid within 3 years before the claim, plus the period of any extension of time to file |
| Cap, claim filed only within the 2-year period | IRC 6511(b)(2)(B) | Refund limited to amounts paid within 2 years before the claim |
For a penalty, the payment dates matter as much as the return date. A late-filing penalty on a 2022 return filed in 2023 and paid in installments through 2025 can be partly refundable and partly barred, depending on when each installment was made. The IRM warns that these are general rules with many exceptions, and instructs employees not to disallow a claim under them “until you have considered whether any exceptions may be applicable.” The statute date calculator can help with the dates.
Which return starts the 3-year period for a penalty depends on the penalty. For penalties tied to a return (failure to file, failure to pay, accuracy-related, IRC 6698 and 6699), the related return is the obvious anchor. For civil penalties assessed on a separate module, such as information return penalties or the international penalties, the sources reviewed here do not spell out the anchor, and the 2-year-from-payment period is the conservative date to work from.
Making the claim
The form
IRM 25.6.1.10.3.2.2.2 identifies Form 843 as the general form for claiming a refund of estate tax, gift tax, excise tax “and Certain Penalties and Interest”. Employment tax claims go on the corresponding X form (941-X, 944-X, 945-X), and income tax claims on 1040-X or 1120-X. On Form 843, line 3 lists each payment date, line 6 the penalty's Code section, line 7 the reason (box c for reasonable cause or another reason allowed by law, box b for erroneous written advice), and line 8 the explanation and computation. A separate Form 843 is generally required for each tax period. See the Form 843 page.
The content
The claim must state the grounds and the facts in detail, verified under penalties of perjury. IRM 25.6.1.10.3.2.1 summarizes Treas. Reg. 301.6402-2(b)(1): a claim must set forth each ground “and facts sufficient to apprise the Commissioner of the exact basis thereof”, and a claim that does not comply will not be considered as a claim for any purpose. This matters later: once the refund statute has run, IRM 25.6.1.10.3.2.4 treats a claim that adds new facts or a new legal position as an untimely new claim, not a supplement. Put every theory in the claim (reasonable cause, FTA, statutory exception, IRS error, computation error), each with its facts.
Informal claims
Courts recognize informal claims, which IRM 25.6.1.10.3.2.3 describes as having a written component that tells the IRS a refund is sought and describes the legal and factual basis. A timely letter or a written abatement request filed after payment can preserve the period, but the IRM calls the investigation “fact intensive” and notes that courts differ on how much detail is required. Do not rely on an informal claim when a formal one can still be filed; perfect it before the IRS takes final action.
What the IRS does with the claim
If the claim is allowed, the penalty is abated and the resulting overpayment is refunded or credited. If the claim is untimely in full, the IRS inputs a zero adjustment and sends Letter 105C; if partly barred, it allows the refundable portion and sends Letter 106C for the rest.
A notice of claim disallowance starts the suit clock. IRM 25.6.1.10.3.1.3 states that the two-year period under IRC 6532(a) does not begin until the IRS sends a notice of claim disallowance by certified or registered mail, unless the taxpayer files Form 2297 waiving that notice. A “no consideration” letter is not a disallowance. Until a proper disallowance issues, the claim stays open.
Reconsideration does not stop the clock. IRM 25.6.1.10.3.1.5: “reconsideration does not extend the period for filing a refund suit under IRC 6532(a).” If talks are continuing near the two-year mark, the parties can extend the suit period before it expires with Form 907. A denied penalty claim can also be sent to Appeals; IRM 20.1.1.4.1.1 notes a claim for a penalty previously upheld by Appeals may be transferred to Appeals if denied at the campus. See appealing a penalty abatement denial.
The IRM is categorical about expired periods: “The law does not allow the IRS to issue a refund once the limitation period has expired. This rule applies even if the taxpayer is correct and all parties agree that the refund should have been paid. There are no exceptions.” (IRM 25.6.1.10.3.1.5).
Refund suits
Most stand-alone penalties cannot be litigated in the Tax Court before payment, so the refund suit is the judicial route. IRM 8.11.1.2.2 summarizes the timing: the taxpayer may sue in a U.S. District Court or the U.S. Court of Federal Claims “at any time after the earlier of: (a) the date of any notice of claim disallowance, or (b) the date that is six months after the date of the taxpayer’s filing of the refund claim.” Suit must be filed within two years of the certified disallowance.
The full payment rule applies. IRM 4.10.26 describes it with a citation to Flora v. United States, 362 U.S. 145 (1960): taxpayers can obtain judicial review in district court or the Court of Federal Claims if the accounts involved “are first paid in full.” Publication 4576 says the same for penalty appeals: most penalties must be paid in full before filing suit. See refund suits and claims.
Special timing rules
- Erroneous written advice (IRC 6404(f)). The Form 843 instructions allow abatement of a penalty caused by erroneous written IRS advice only if the request is submitted within the period allowed for collecting the penalty, or the penalty was paid within the period for claiming a credit or refund of it. Attach the written request, the IRS's written advice, and any report identifying the penalty. See penalty relief from erroneous IRS advice.
- Disasters (IRC 7508A(f)). For purposes of the IRC 6511(b)(2)(A) lookback, any period disregarded under IRC 7508A for filing a return is treated as an extension of time to file, which lengthens the lookback for affected taxpayers. IRM 25.16.1.4.2 also notes recent legislation extending the lookback period for disaster-affected taxpayers; see disaster postponements.
- Interest abatement. An IRC 6404(e)(1) interest abatement request must also be made while the IRC 6511 period is open; it is one of the six criteria in IRM 20.2.7.5.1. See interest abatement.
Questions practitioners ask
The client paid a failure-to-file penalty three years ago. Can we still request FTA?
Only if a refund claim is still timely under IRC 6511 and the payment falls within the lookback period. IRM 25.6.1.10.1.1 says penalties are not abated on a fully paid account when the resulting overpayment is barred, even for FTA.
Is a letter enough, or must we use Form 843?
Form 843 is the prescribed form for most penalty refund claims, and using it avoids arguments about whether a letter was a valid claim. A letter can qualify as an informal claim, but courts differ on the detail required.
When can we file a refund suit on a penalty claim?
After the earlier of the IRS's notice of disallowance or six months after filing the claim, and within two years of a certified notice of disallowance (IRC 6532(a)), unless extended on Form 907 before it expires.
Does asking for reconsideration extend the two-year suit deadline?
No. IRM 25.6.1.10.3.1.5 says reconsideration does not extend the IRC 6532(a) period. Extend it in writing on Form 907 or file suit.
Must the whole penalty be paid before suing?
Generally yes. The IRM cites Flora v. United States for the rule that the accounts involved must be paid in full before district court or Court of Federal Claims review, and Publication 4576 says most penalties must be paid in full before suit.
What if the IRS never sent a disallowance letter?
Then the IRC 6532(a) period has not started. IRM 25.6.1.10.3.1.4 notes the IRS may consider supplemental information on such a claim, and the claim remains open until disallowed by a proper notice or waived on Form 2297.