How to File Form 843 for Penalty Abatement or Refund

To file IRS Form 843, download the current version from irs.gov, complete the one-page form with your taxpayer information and the tax period involved, write a specific reasonable-cause explanation on line 8, attach documents that back up every factual claim you make, and mail the package by certified USPS to the service center listed in the form’s instructions. Before you do any of that, check two things: whether a phone call to the number on your penalty notice could resolve it faster, and whether your claim is still inside the statute of limitations.

When Form 843 Is the Right Form

Form 843 is narrower than it looks. You use it to request a refund or abatement of penalties, additions to tax, interest, and certain fees, and to claim a refund of certain non-income taxes such as Social Security or Medicare tax that an employer withheld in error.¹

You cannot use it to abate income tax, estate tax, or gift tax.¹ If the problem is an error on your individual income tax return, file Form 1040-X instead. Form 843 also does not cover refunds of overpaid excise taxes reported on Forms 720, 730, 11-C, or 2290.²

The typical reasons people reach for the form are removing a failure-to-file, failure-to-pay, or failure-to-deposit penalty; reducing interest that accrued because of an IRS error or delay; recovering Social Security or Medicare tax an employer wrongly withheld and refuses to correct;² and getting a penalty removed after relying on incorrect written advice from an IRS employee.

Try the Phone Before You File

If you want a penalty removed rather than a tax refunded, you may not need the form at all. The IRS will decide some penalty relief requests over the phone. Call the toll-free number printed on your penalty notice, keep the notice in front of you, and explain your reasoning. The agent tells you during the call whether the request is granted, and if they can’t grant it they will point you to Form 843.³

The phone route works especially well for First-Time Penalty Abatement, an administrative waiver for taxpayers with a clean three-year compliance record who are current on all filings and payments.⁴ Under that waiver you don’t have to prove reasonable cause or document a hardship, so it is worth asking about first.

Check the Filing Deadline First

Every Form 843 claim has a statute of limitations, and missing it ends the claim. For a refund, you generally must file within three years from the date you filed the original return, or two years from the date you paid the tax, whichever is later.¹ If you never filed a return, the window is two years from the date of payment.⁵

The deadline also caps the recovery. File within the three-year window and the refund is limited to tax paid during those three years plus any extension period. File under the two-year rule and you can only recover tax paid during the two years before the claim.⁵

One narrow exception: if you were physically or mentally unable to manage your financial affairs due to a medical condition expected to last at least 12 months, the clock pauses for that period. The pause does not apply if a spouse or another authorized person could have acted for you.⁵

Filling Out the Form

Download the current version of Form 843 from irs.gov. It is one page, but the entries have to line up with each other and with the notice you received.

Enter your name exactly as it appears on the tax notice or return connected to the claim. Include your spouse’s name if the claim relates to a joint return. Individuals enter a Social Security Number; businesses enter an Employer Identification Number.¹

Line 1 asks for the tax period. If your claim covers more than one quarter or year, use a separate Form 843 for each period. Line 3 is the date you paid the tax, penalty, or interest you want refunded. Line 4 has checkboxes for the type of tax or fee: Employment, Estate, Gift, Excise, Income, Fee, or Civil penalty.²

Line 5 asks which return the claim relates to. Common entries include 941 (employer’s quarterly federal tax return), 940 (federal unemployment tax), 1040 (individual income tax), and 1120 (corporate income tax). Line 6 is for the Internal Revenue Code section that applies to the penalty being assessed; your penalty notice usually references the section. Line 7 has checkboxes for the reason you are filing, covering reasonable cause, IRS error or delay, and erroneous written advice.¹

Writing the Reasonable Cause Explanation

Line 8 is the heart of the form. Here you explain, in your own words, why the IRS should grant your request. For penalty abatement the legal standard is reasonable cause, meaning you exercised the ordinary care a reasonably prudent person would exercise but still could not meet your tax obligation on time.⁶

The examiner reviewing your claim weighs several things:⁶

What specific event prevented compliance, such as a serious illness, a natural disaster, a fire, or documented bad advice from a tax professional.
How that event directly caused the missed deadline or unpaid balance. Vague statements like “I had a hard year” will not carry the claim.
How you handled your other affairs during the same period. Filing other returns and paying other bills on time while skipping this one weakens the argument.
How quickly you complied once the obstacle cleared. Waiting months after recovering to file or pay undermines reasonable cause.
Your compliance history for at least the prior three years. A recurring pattern of the same penalty being assessed and abated suggests a lack of ordinary care rather than an isolated hardship.

Keep the explanation factual and specific. Give dates, dollar amounts, and a clear timeline. Attach the documents that support what you say: medical records, insurance claims, hospital discharge papers, IRS correspondence, death certificates where relevant, or a letter from your accountant. Every factual claim in the explanation should match an attached document. Include the penalty notice that triggered the claim so the reviewer has immediate context.

A lack of funds, on its own, is not reasonable cause for failing to pay. If a cash shortage was itself caused by broader circumstances such as an unexpected job loss combined with a medical emergency, the financial hardship can be part of a larger reasonable cause argument.⁷

Claims Based on Erroneous Written Advice From the IRS

If you relied on incorrect written guidance from an IRS employee and that advice caused the penalty, that is a separate basis for relief. The IRS will abate the penalty if all three conditions are met:¹

You reasonably relied on the written advice.
The advice was a response to a specific written question you or your authorized representative submitted.
The penalty did not result from your failure to give the IRS adequate or accurate information.

Check box “b” on line 7 and attach three things: your original written request for advice, the IRS’s written response containing the bad advice, and any tax adjustment report identifying the penalty. Verbal advice from an agent does not qualify, and neither does general information from IRS publications.

Claims for Interest Abatement

Interest abatement is a different animal. Under 26 U.S.C. § 6404(e), the IRS can reduce interest that accrued because of an unreasonable error or delay by an IRS employee performing a routine procedural or management-related task.⁸ Normal processing time does not qualify. Federal regulations describe two categories:⁹

Ministerial acts, meaning routine procedural tasks like transferring a case file to a new office, issuing a notice after all reviews are complete, or pulling up account data to calculate a balance.
Managerial acts, meaning decisions about staffing and case assignments, such as sending an agent to extended training without reassigning cases, granting prolonged sick leave without handing off the workload, or a clerk misplacing your file.

The abatement only covers interest that accrued during the period of the IRS error or delay. Interest that built up before the IRS contacted you in writing about the issue, or interest caused by your own delays, is not eligible. Filing Form 843 does not pause the interest clock while the IRS reviews the claim.

How to Mail the Form

Form 843 must be mailed. There is no electronic filing option. The correct IRS address depends on the type of claim and, in some cases, where you live; the form instructions contain a routing table that matches your situation to the right service center.¹ For penalty abatement, you generally mail the form to the service center where you would file a current-year return for the tax involved.

Send it by certified mail with a return receipt, or by registered mail. Under the “timely mailed, timely filed” rule, the U.S. postmark date counts as the filing date, which protects you if the IRS receives the envelope after a deadline.¹⁰ If you use a private delivery service the postmark rules are more limited, so USPS registered or certified mail is the safer choice.

After You File

Processing takes time. The IRS does not publish a guaranteed turnaround, so plan on several months at minimum. You may receive an acknowledgment letter or a request for more documentation in the meantime. If you hear nothing for an extended period, call the IRS taxpayer assistance line with your claim details. Eventually you will get a formal notice allowing the claim in full, allowing it in part, or denying it.

If the Claim Is Denied

A denial is not the end. You generally have 30 days from the date of the rejection letter to request a review by the IRS Independent Office of Appeals.¹¹ Appeals routes your case to a different officer who was not involved in the first decision. Read your rejection letter closely, because the specific deadline can differ from the standard 30 days.¹²

Internal Revenue Service. Instructions for Form 843 (12/2024)

IRS. Form 843, Claim for Refund and Request for Abatement

Internal Revenue Service. Penalty Relief

Internal Revenue Service. Administrative Penalty Relief

Office of the Law Revision Counsel. 26 U.S. Code 6511 – Limitations on Credit or Refund

Internal Revenue Service. 20.1.1 Introduction and Penalty Relief

Internal Revenue Service. Penalty Relief for Reasonable Cause

Office of the Law Revision Counsel. 26 U.S.C. 6404 – Abatements

eCFR. 26 CFR 301.6404-2 – Abatement of Interest

Office of the Law Revision Counsel. 26 U.S. Code 7502 – Timely Mailing Treated as Timely Filing and Paying

Internal Revenue Service. Penalty Appeal

Internal Revenue Service.