Form 843 Explained: How to Claim a Refund or Penalty Abatement

Form 843, Claim for Refund and Request for Abatement, is the IRS form you use to ask for a refund of certain taxes, fees, penalties, or interest you have already paid, or to ask the IRS to abate (remove) penalties that have been assessed but not yet collected. Form 843 is not used for income tax refunds (those go on Form 1040-X), and it cannot be e-filed. According to the IRS, it must be submitted on paper to the address that corresponds to the underlying tax or notice. The general filing window is 3 years from the date you filed the original return, or 2 years from the date you paid the tax, whichever is later.

The most common uses include:

Penalty abatement for failure-to-file, failure-to-pay, or accuracy-related penalties when you have reasonable cause
First-time abatement (FTA) of a single penalty if your prior three years of compliance are clean
Refunds of penalties you already paid, including COVID-era late-filing penalties covered by the Kwong ruling
Refunds of Social Security or Medicare tax wrongly withheld, where your employer cannot or will not issue the refund directly

Below, you’ll find what Form 843 covers, when to use a different form instead, how to file it correctly, and the specific scenarios where it matters most for U.S. taxpayers, including Americans abroad.

What Is Form 843?

Form 843, officially titled Claim for Refund and Request for Abatement, is the IRS’s general-purpose claim form for two related but distinct asks:

A refund of certain taxes (other than income tax), interest, penalties, or fees that you have already paid
An abatement of certain penalties or interest that the IRS has assessed, but you have not yet paid

The form runs a single page and asks you to identify the tax period, the type of tax involved, the amount you are claiming, the reason for the claim, and your supporting facts. Line 5a is the most important checkbox: it determines whether the claim is for abatement, a refund, or a credit. Line 7 is the narrative explanation, and this is where most successful claims live or die.

Form 843 is not connected to your annual income tax return. You file it separately, on paper, to the IRS address tied to the underlying tax or notice (the IRS provides a separate mailing address chart in the form instructions). It is not e-filable.

Form 843 and the Kwong Ruling: COVID-Era Penalty Refunds

In April 2026, a federal court ruling in Kwong v. United States opened a refund pathway for taxpayers who paid late-filing penalties on returns filed between January 20, 2020, and July 10, 2023. The decision held that automatic late-filing penalties were not properly assessed during the COVID-19 disaster period for affected taxpayers, and that refund claims could be filed on Form 843.

The key deadlines:

July 10, 2026: the protective-claim deadline for affected taxpayers to file Form 843
The general 2-year-from-payment / 3-year-from-filing statute of limitations under IRC § 6511 continues to apply

If you paid a late-filing penalty on a return filed during the COVID disaster window, you may be eligible for a refund under Kwong. Greenback’s full Kwong article walks through transcript review, formal vs. protective claims, and what to put on Line 7 of Form 843.

The Kwong July 10 Deadline Is Close. Did You Pay a COVID-Era Penalty?

Greenback helps Americans abroad file Form 843 in time to claim a refund of late-filing penalties paid during the COVID disaster window.

When to Use Form 843 (and When to Use a Different Form)

Form 843 covers a specific lane in the IRS refund-and-abatement system. The most common confusion is between Form 843 and Form 1040-X, which is the form you use to amend an income tax return.

If you want to…	Use this form
Refund or abate penalties or interest the IRS assessed	Form 843
Refund Social Security or Medicare tax wrongly withheld (and your employer will not refund it)	Form 843
Refund excise tax, employment tax, or certain other non-income taxes	Form 843
Amend your income tax return to claim a refund of income tax	Form 1040-X
Extend your filing deadline	Form 4868 (expats can also use Form 2350)
Make a voluntary disclosure	Form 14457

If your refund relates to income tax shown on your Form 1040 (a missed deduction, a missed credit, an overstated income figure), Form 843 is the wrong form. Use Form 1040-X.

Who Files Form 843?

Form 843 is non-persona-specific and is filed by a wide range of taxpayers, including:

U.S. taxpayers seeking penalty abatement after receiving a notice (CP14, CP501, CP503, CP504, or similar)
Taxpayers who have already paid a penalty they believe was incorrectly assessed
Workers requesting a refund of wrongly withheld Social Security or Medicare tax, including F-1 students, J-1 scholars, members of religious orders, and certain foreign workers
Taxpayers requesting interest abatement due to unreasonable IRS error or delay (a high bar)
Eligible filers requesting a refund of COVID-era late-filing penalties under the Kwong ruling, with a key deadline of July 10, 2026
U.S. expats asserting reasonable cause for a missed deadline due to expat-specific circumstances (a foreign mail disruption, illness abroad, a CPA failure, or similar)

How to File Form 843

Form 843 is a paper-only filing. The basic process:

Download the latest version of Form 843 from IRS.gov.
Complete the identifying information at the top (name, address, SSN or EIN, spouse’s SSN if applicable).
Line 1: Enter the tax period for which the claim relates.
Line 2: Enter the dollar amount of the refund or abatement you are requesting.
Line 3: Indicate the type of tax (employment, excise, estate, gift, income, or other).
Line 4: Identify the type of return filed (if any).
Line 5a: Check abatement, refund, or credit.
Line 5b: Identify the dates of payment if claiming a refund.
Line 6: Identify the Internal Revenue Code section under which the penalty was assessed if you know it (often shown on the IRS notice).
Line 7: Write a clear explanation of why you qualify for relief. Cite specific facts and dates. This is the most important section.
Sign and date the form. Attach any supporting documents: a copy of the IRS notice, medical records, mail receipts, professional advice records, or other evidence supporting your reasonable cause.
Mail to the IRS address tied to the underlying tax type, listed in the Form 843 instructions. If you are responding to a specific IRS notice, mail it to the address listed on the notice.

Keep a copy of everything for your records. Form 843 claims can take 3 to 6 months or longer to be processed by the IRS, particularly during peak filing periods.

Important: Filing as a Protective Claim

If you are filing Form 843 to preserve your refund right while a legal or factual contingency is still pending (for example, a court ruling on appeal, awaiting further IRS guidance, or ongoing transcript review), mark the form as a protective claim. Write “PROTECTIVE CLAIM” prominently at the top of Form 843 above the form title (capital letters, ideally red ink), and add one sentence on Line 7 stating that the filing is submitted as a protective claim under Treas. Reg. § 301.6402-2(b)(1).

A protective claim preserves your filing within the statute of limitations and can be supplemented or perfected once the contingency is resolved. This is especially relevant for Kwong COVID-era penalty refund claims filed before the July 10, 2026 deadline.

Penalty Abatement: How Form 843 Works in Practice

Penalty abatement is the single most common use of Form 843. The IRS assesses penalties under several categories, and Form 843 is the vehicle for requesting that they be removed. Two abatement pathways matter most:

Reasonable Cause Abatement

The IRS will abate certain penalties if you can show you exercised ordinary business care and prudence but were nonetheless unable to meet your tax obligations. The reasonable-cause categories the IRS regularly accepts include:

Death, serious illness, or unavoidable absence of the taxpayer or an immediate family member
Fire, casualty, natural disaster, or other disturbance that affected your ability to file or pay
Inability to obtain records despite reasonable efforts
Erroneous written advice from the IRS that you relied on in good faith
Reliance on a qualified tax professional in limited circumstances

Ignorance of the law and taxpayer mistakes are rarely accepted as reasonable cause. The explanation on Line 7 should be specific, factual, and tied to dates.

First-Time Abatement (FTA)

The IRS also offers a separate First-Time Penalty Abatement for a single penalty if you meet three criteria: you filed all required returns for the prior three years, you paid (or arranged to pay) any tax due, and you have no prior penalties for the three preceding tax years. FTA is the easiest path when you qualify, and Form 843 is one way to claim it (you can also request FTA by phone). Greenback’s First-Time Abatement breakdown explains who qualifies and how to ask.

What Happens After You File Form 843?

The IRS reviews Form 843 claims on a non-priority track, which means processing takes longer than for annual returns. Typical timeline:

Acknowledgment: 4 to 8 weeks after the IRS receives your filing
Decision: 3 to 6 months in most cases, sometimes longer
Approval: The IRS adjusts your account and either refunds the money or removes the penalty
Denial: The IRS sends you a notice explaining the reason, with appeal rights

If your claim is denied, you generally have 2 years from the date of the denial to file a refund suit in U.S. District Court or the Court of Federal Claims. Most taxpayers do not litigate Form 843 denials, but the option exists if the amount at stake justifies the cost.

Common Mistakes When Filing Form 843

Using Form 843 to claim an income tax refund: that requires Form 1040-X, not 843
Skipping the reasonable cause narrative on Line 7: the IRS treats an unsupported claim as a non-claim
Filing past the statute of limitations: 3 years from filing or 2 years from payment, whichever is later
Mailing to the wrong IRS address: the correct address depends on the tax or notice involved; check the instructions or the notice you received
Forgetting to attach the IRS notice copy: speeds processing dramatically when included
E-filing: Form 843 cannot be e-filed; if you try, the claim does not exist for IRS purposes

The Line 7 Narrative Is What Wins or Loses Your Form 843 Claim

Greenback helps Americans abroad write defensible reasonable-cause statements that hold up to IRS review.

Frequently Asked Questions About Form 843

What is the deadline to file Form 843?

The general rule is 3 years from the date you filed the original return, or 2 years from the date you paid the tax (or penalty), whichever is later, under IRC § 6511. For specific situations, such as the Kwong COVID-era penalty refunds, separate deadlines may apply. Always check the deadline tied to the specific penalty or refund you are claiming.

Can Form 843 be filed electronically?

No. Form 843 must be submitted on paper. It cannot be e-filed through tax software or the IRS website. Mail the completed form, with all supporting documents, to the IRS address tied to the underlying tax type or notice.

What is the difference between Form 843 and Form 1040-X?

Form 1040-X amends an income tax return to correct income, deductions, credits, or filing status, typically to claim an income tax refund. Form 843 claims refunds of non-income taxes, penalties, interest, and fees, or asks the IRS to abate penalties that have been assessed. They cover different lanes and use different mailing addresses.

Can I use Form 843 to abate FBAR penalties?

No. FBAR civil penalties are assessed under Title 31 (the Bank Secrecy Act), not under the Internal Revenue Code. They have a separate process administered by FinCEN, not the IRS. Form 843 covers only IRS-administered penalties under Title 26.

How long does the IRS take to process Form 843?

Most claims take 3 to 6 months. Complex or high-dollar claims, or those filed during peak season, can take longer. The IRS does not provide a status portal for Form 843 the way it does for income tax refunds; if you have not heard back within 6 months, you can call the IRS or your local Taxpayer Advocate Service office.

Do I need a tax professional to file Form 843?

You can file Form 843 on your own, especially for straightforward first-time abatement requests. For reasonable-cause claims, complex penalty disputes, or large-dollar refunds, working with a tax professional improves your odds because the narrative on Line 7 is the determining factor. Self-prepared filings can also become evidence in any subsequent dispute, so the wording matters.

What if I already paid the penalty? Can I still file Form 843?

Yes. Form 843 covers both refunds of penalties already paid and abatement of penalties assessed but not yet paid. If you have already paid, you check the refund box on Line 5a. If the penalty is still outstanding, you check the abatement box. The supporting facts on Line 7 work the same way for both.

The information in this article is for general informational purposes only and does not constitute tax, legal, or financial advice. IRS rules are complex and change over time, and the right form to file depends on the specific facts of your situation. Consult a qualified tax professional before submitting Form 843 for a high-dollar or complex matter.