IRS Forms

Form 843 Instructions: How to Abate IRS Penalties and Interest (2026)

By Angeline Balsitis, EA · Reviewed by Melissa Ly, Chief Tax Officer · Updated February 8, 2026 · Editorial Standards

What Form 843 is — and what it isn't

Form 843 is one page, but it covers a lot of ground. Its full name is the "Claim for Refund and Request for Abatement." In plain English, it's how you formally ask the IRS to take something off your balance. The official form and line-by-line rules live on the IRS About Form 843 page and the Instructions for Form 843.

You can use Form 843 to request:

• Penalty abatement — failure-to-file, failure-to-pay, and certain other penalties, based on first-time abatement or reasonable cause.
• Interest relief — but only interest that piled up because of an IRS error or unreasonable delay, not interest you simply owe.
• A refund of certain taxes or fees — such as some employment taxes, excise taxes, or fees the IRS charged in error.

Here's what Form 843 cannot do: it can't lower your income tax. If you reported the wrong income or missed a deduction, you file an amended return (Form 1040-X), not Form 843. It also can't be used for certain employment tax adjustments that have their own forms.

When Form 843 is the right tool

Most people who land here are staring at a penalty and asking whether it can come off. It often can. The two most common paths are:

• First-time penalty abatement (FTA): if you have a clean compliance history — filed and paid on time for the prior three years — the IRS may remove a single failure-to-file or failure-to-pay penalty as a one-time courtesy.
• Reasonable cause: if something outside your control got in the way — serious illness, a death in the family, a natural disaster, records destroyed in a fire — you can ask the IRS to waive the penalty because you acted in good faith.

If you want to understand how the penalties stacked up in the first place, our guide on failure-to-file vs. failure-to-pay penalties breaks down which one is hitting you and how fast. And if you're trying to figure out the total damage, see how big IRS penalties actually get, with the math.

Form 843, box by box

The form is short. Here's what each part is really asking:

1. Top section: your name, address, and Social Security number (or EIN for a business). Add a spouse's SSN if the claim involves a joint return.
2. Line 1 — tax period: the exact year or quarter the penalty or tax applies to. File a separate Form 843 for each tax period and each type of tax.
3. Line 2 — amount: the dollar amount you're asking the IRS to refund or abate.
4. Line 3 — type of tax or fee: check the box that fits (employment, excise, income, estate, gift, etc.).
5. Line 4 — type of penalty: if you're asking to remove a penalty, enter the Internal Revenue Code section if you know it; the IRS notice usually lists it.
6. Line 5 — reason: check whether your claim is based on an IRS error or delay, reasonable cause, or another reason.
7. Line 7 — explanation: this is the heart of the form. In plain, specific language, explain what happened, the dates, and why it was beyond your control. Attach documents — hospital records, a death certificate, a disaster declaration, proof of an IRS mistake.
8. Signature: sign and date it. An unsigned claim gets rejected.

The single biggest reason these claims fail is a vague Line 7. "I forgot" is not reasonable cause. "I was hospitalized from March 3 to April 20 and could not access my records" — with the discharge paperwork attached — is.

What happens if you skip it — or file it wrong

Penalties and interest don't sit still. The failure-to-pay penalty runs at 0.5% of the unpaid tax per month, and interest compounds daily on top of it. The longer a balance sits, the more there is to abate later — and the more a missed deadline costs you. If you want to see how fast that snowballs, read how the IRS interest rate on back taxes compounds.

A few common mistakes that get Form 843 bounced back:

• Using it for income tax. That belongs on Form 1040-X.
• Combining tax periods. One form per period, per tax type.
• Filing late. Past the 3-year/2-year window, the claim is dead on arrival.
• A thin explanation. No dates, no documents, no abatement.

One honest note: requesting first-time abatement by phone is often faster than mailing Form 843. Many people call the IRS, get the penalty removed in one conversation, and never file the form at all. Form 843 shines when a phone request is denied, when you need a written record, or when you're claiming a refund the phone line can't handle.

How to file Form 843, step by step

1. Confirm Form 843 is the right form. Penalty or interest abatement, or a refund of a non-income tax or fee — yes. Income tax change — no, use 1040-X.
2. Pull your notice and records. Note the exact tax period, the penalty amount, and the IRS Code section listed on the notice.
3. Gather your proof. For reasonable cause, collect dated documents that show what stopped you from filing or paying on time.
4. Fill out one form per period. Write a clear, dated, specific explanation on Line 7 and attach your evidence.
5. Mail it to the right place. Use the address on your IRS notice, or the service center listed in the current Form 843 instructions. Keep a complete copy.
6. Follow up. Processing can take several months. If a delay causes hardship, the Taxpayer Advocate Service can help.

If you also owe a balance you can't clear at once, abatement and a payment plan often go together. Our walkthroughs of Form 9465 and Form 433-F cover the forms that set up monthly payments while your abatement request is reviewed.

Form 843 questions, answered

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: failure-to-file vs. failure-to-pay penalties, how much IRS penalties really cost, or browse all guides.