IRS Penalty Abatement Letter: Exactly What to Write

The IRS assesses penalties on roughly 40 million returns per year. It also abates millions of those penalties when taxpayers ask. The gap between the two numbers is not luck or connections; it is that most people do not know they can ask, do not know which standard to invoke, and do not know how to write the request. There are two main routes to getting a penalty removed: first-time abatement (FTA), which is an administrative waiver based on your compliance history, and reasonable cause, which is a statutory defense based on the facts and circumstances that caused the failure. Both are free to request. Neither requires a lawyer. This page covers what to write, what the IRS is actually looking for, and what to do if the first request is denied.

What penalties can be abated?

Most common penalty abatements apply to three penalties:

The failure-to-file penalty under IRC 6651(a)(1) is 5% of the unpaid tax per month, capped at 25%. This is the penalty for filing your return late without an extension. The failure-to-pay penalty under IRC 6651(a)(2) is 0.5% of the unpaid tax per month, also capped at 25%. This accrues until the tax is paid in full. The accuracy-related penalty under IRC 6662 is 20% of the underpayment attributable to negligence, disregard of rules, or a substantial understatement of income.

Estimated tax penalties under IRC 6654 are technically interest, not penalties, and have a narrower set of waiver criteria: mainly the underpayment was caused by a casualty, disaster, or the taxpayer retired or became disabled during the year.

Penalties for failure to file information returns (Forms 5471, 3520, 8938, FBAR) have their own abatement standards. FBAR penalties follow the Bank Secrecy Act, not the IRC. Form 3520 penalties follow a separate statutory and procedural track. This article covers the core income tax penalties.

What is first-time abatement, and do I qualify?

First-time abatement (FTA) is an administrative waiver. It is not in the statute; it lives in the Internal Revenue Manual at IRM 20.1.1.3.6.1. The IRS will remove a failure-to-file or failure-to-pay penalty if three conditions are met:

1. You had no penalties (other than estimated tax penalties) in the three tax years preceding the penalty year.
2. You have filed all currently required returns or filed valid extensions.
3. You have paid the tax shown on the return, or have arranged to pay (entered into an installment agreement or received a payment extension).

FTA is by far the easiest path. The IRS does not ask why you filed late or paid late. It does not require a letter. You can call the IRS (800-829-1040), reference your clean compliance history, and ask the representative to apply FTA. Most representatives know the policy and can apply it on the spot. If you prefer a written request, a short letter works:

“I am writing to request abatement of the [failure-to-file / failure-to-pay] penalty assessed on my [year] return, notice number [CP14/CP161/etc.]. I have had no penalties assessed in the three prior tax years [year, year, year], all required returns are filed, and the tax has been paid [or is being paid under installment agreement number ___]. I request abatement under the IRS’s first-time administrative waiver policy (IRM 20.1.1.3.6.1).”

That is the entire letter. The IRS does not need a hardship story for FTA. Adding one does not help and can muddy the request.

FTA applies to one penalty per period. If you have both a failure-to-file penalty and a failure-to-pay penalty for the same year, FTA generally removes the larger penalty (the filing penalty) while leaving the smaller one (the payment penalty) in place. Some practitioners request abatement of both. The IRS guidance does not explicitly limit FTA to one penalty per period, but in practice the representative may apply it only to the filing penalty.

How do I write a reasonable cause letter?

If you do not qualify for FTA (because you had penalties in the prior three years, or you have not filed all returns), the fallback is reasonable cause under IRC 6651(a). The standard is: “the failure was due to reasonable cause and not due to willful neglect.” The IRS elaborates in IRM 20.1.1.3.2: reasonable cause exists when the taxpayer “exercised ordinary business care and prudence” but was still unable to comply.

The IRS lists specific circumstances that may constitute reasonable cause:

• Death or serious illness of the taxpayer or an immediate family member
• Fire, natural disaster, or casualty that destroyed records
• Inability to obtain records necessary to determine the amount of tax due
• Reliance on the advice of a tax professional (but the reliance must be reasonable, meaning the professional had all the relevant facts)
• IRS errors (wrong information provided by the IRS, processing delays, lost documents)
• Ignorance of the law, in limited circumstances (this is the weakest ground and rarely succeeds alone)
• Incapacity, including mental health events that prevented the taxpayer from managing financial affairs

A reasonable cause letter must do three things: (1) explain what happened, (2) explain why it prevented you from filing or paying on time, and (3) show that you acted responsibly before and after the failure. The IRS evaluates both the cause itself and the taxpayer’s conduct. If you were ill for three months and then waited another six months after recovering before filing, the illness explains the first three months but not the last six.

Here is an annotated structure:

Paragraph 1 (what and when): “I am writing to request abatement of the [penalty type] of $[amount] assessed on my [year] return, notice number [number]. The penalty was assessed because [my return was filed X months late / I underpaid by $Y / etc.].”

Paragraph 2 (why it happened): “The failure occurred because [specific event]. [Explain the timeline: when the event started, how it affected your ability to file or pay, and when it resolved. Be specific. Dates matter. Attach supporting documents: hospital records, insurance claims, fire department reports, correspondence with the tax professional, etc.]”

Paragraph 3 (what you did about it): “Once [the event resolved / I was able to], I [filed the return / made payment / engaged a new accountant / etc.] on [date]. I have filed all required returns and the outstanding tax has been paid [or is being paid under installment agreement number ___].”

Paragraph 4 (the ask): “Based on these facts, I request that the penalty be abated under IRC 6651(a) and Treas. Reg. 301.6651-1(c)(1) on the grounds of reasonable cause. I exercised ordinary business care and prudence but was unable to comply due to circumstances beyond my control.”

What if the penalty is for unreported income?

Accuracy-related penalties under IRC 6662 require a different approach. These are the penalties most commonly proposed on CP2000 notices. The penalty applies when there is a “substantial understatement” (the understatement exceeds the greater of 10% of the correct tax or $5,000) or when the understatement is due to negligence. The defenses are:

Substantial authority: If the position had substantial authority in the tax law (statute, regulations, revenue rulings, court cases), the penalty does not apply (IRC 6662(d)(2)(B)). This is a legal standard, not a factual one.

Adequate disclosure: If you disclosed the position on the return (on Form 8275 or Form 8275-R), the penalty does not apply as long as there was a reasonable basis for the position (IRC 6662(d)(2)(B)(ii)).

Reasonable cause and good faith: Under IRC 6664(c), the accuracy penalty does not apply if the taxpayer had reasonable cause and acted in good faith. Reliance on a qualified tax professional who had all the relevant facts is the most common path here.

For cross-border filers, accuracy penalties often arise from treaty position disputes (for example, claiming treaty benefits on a 1042-S distribution that the IRS reclassifies) or from foreign tax credit miscalculations. The reasonable cause defense is strongest when you relied on a professional who understood the cross-border issues and advised the position.

Should I call or send a letter?

For FTA, calling is usually faster and simpler. The representative can apply it on the spot if you qualify. Call 800-829-1040, navigate to an individual representative, verify your identity, and ask for first-time abatement. Reference IRM 20.1.1.3.6.1 if the representative is unfamiliar with the policy. Some representatives are better than others; if one says no without checking your history, call back and try again.

For reasonable cause, a letter is almost always better. The details matter, supporting documents need to be attached, and you want a written record of what you submitted. Mail the letter to the address shown on the penalty notice, or to the IRS service center that processed your return. Include the notice number, your SSN, the tax year, and copies (not originals) of all supporting documents. Keep a copy of everything you send.

You can also request abatement on Form 843 (Claim for Refund and Request for Abatement), though a plain letter with the same information works equally well.

What if the IRS says no?

If the IRS denies the abatement request, you have 30 days from the denial letter to request a conference with IRS Appeals. This is an administrative appeal, not a court filing. Write a brief protest letter stating the penalty, the reason it should be abated, and the facts supporting your position. IRS Appeals officers have broader settlement authority than the original examiner and can consider the hazards of litigation (meaning: would the IRS likely win if this went to court?).

If the penalty is large and the underlying tax debt is also substantial, an Offer in Compromise may be worth evaluating before paying the full amount.

If Appeals also denies the abatement, the next step depends on whether you have paid the penalty. If you paid, you can file a refund claim on Form 843 and, if denied, sue in federal district court or the Court of Federal Claims. If you have not paid and the IRS issues a statutory notice of deficiency (for accuracy penalties assessed as part of an audit), you can petition the US Tax Court within 90 days. Most individual taxpayers who go to Tax Court use the small tax case procedure for amounts under $50,000, which is less formal and does not require a lawyer.

How does this interact with my Canadian obligations?

For dual filers (US citizens or green card holders who also file in Canada), an IRS penalty abatement that reduces the US tax liability can affect the Canadian foreign tax credit calculation. If you claimed a credit on your Canadian return for US taxes paid, and the IRS reduces the tax (including penalties that were part of the assessed amount), the Canadian credit may need to be adjusted. This matters mainly when the penalty was originally included in the amount you reported as “US tax paid” on the Canadian return, which happens more often than it should.

Going the other direction, if you are filing a CRA taxpayer relief request on Form RC4288 at the same time as an IRS penalty abatement request, coordinate the timing. A successful CRA relief request may change the Canadian tax that drives your US foreign tax credit. A successful IRS abatement may change the US tax that drives your Canadian foreign tax credit under Article XXIV of the treaty. The two do not need to happen in a specific order, but be aware that success on one side may trigger a small adjustment on the other.

What should I do next?

Check whether you qualify for FTA: no penalties in the prior three years, all returns filed, tax paid or in an installment agreement. If yes, call the IRS and request it by phone. If FTA does not apply, draft a reasonable cause letter with specific facts, a timeline, and supporting documents. If the IRS denies the request, file a protest with IRS Appeals within 30 days.

If you also owe Canadian penalties, the RC4288 taxpayer relief guide covers the CRA side. For FBAR-specific penalties, the FBAR penalty decision tree maps the resolution paths.

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.