IRS Form 843 Instructions: How to File Correctly in 2026 (Step-by-Step Guide)

IRS Form 843 Instructions – Form 843, Claim for Refund and Request for Abatement, helps U.S. taxpayers request refunds or abatements of certain taxes, penalties, interest, and fees. The IRS redesigned the form and instructions in December 2024, and this version remains current.

This guide provides official, up-to-date instructions based on IRS.gov resources for accurate filing.

What Is IRS Form 843?

Use Form 843 to claim a refund or request an abatement of:

  • Certain penalties and additions to tax (e.g., failure-to-file, failure-to-pay).
  • Interest in limited cases (IRS error or delay).
  • Specific taxes or fees (e.g., excess Social Security/Medicare tax, branded prescription drug fee).

Do not use Form 843 for:

  • Income tax refunds or adjustments (use Form 1040-X).
  • Employer adjustments to FICA, RRTA, or income tax withholding (use corresponding “X” forms like 941-X).
  • Most excise tax refunds (use Form 8849 in many cases).
  • Estate or gift tax in some situations (specific rules apply).

Who Should File Form 843?

  • Individual taxpayers, businesses, estates, or trusts.
  • Authorized representatives with Form 2848 (Power of Attorney).
  • Legal representatives for deceased taxpayers (with proper documentation).

File a separate Form 843 for each tax period or fee year in most cases.

When to File? Deadlines for Form 843

Generally, file within the later of:

  • 3 years from the date you filed the original return, or
  • 2 years from the date you paid the tax, penalty, or interest.

Special note for 2026: Some taxpayers may qualify for COVID-era penalty and interest relief claims, with key deadlines around July 10, 2026. Consult a tax professional for protective claims if applicable.

Always verify deadlines on IRS.gov/Form843.

Step-by-Step Instructions: How to Fill Out Form 843?

Download the latest Form 843 (Rev. December 2024) and instructions from IRS.gov. The form cannot be e-filed — it must be mailed.

  1. Top of Form: Check the Appropriate Box
    Select your reason (e.g., abatement of penalty due to reasonable cause, refund of excess Social Security tax, abatement of interest due to IRS error, branded prescription drug fee, etc.). Use “Other (specify)” if needed.
  2. Identifying Information
    Enter your name, SSN or EIN, address, and spouse’s information (if joint). Include daytime phone number.
  3. Line 1: Tax Period
    Enter the beginning and ending dates (MM/DD/YYYY) for the period involved.
  4. Line 2: Amount
    Enter the total amount you want refunded or abated.
  5. Line 3: Date(s) of Payment
    List payment dates (attach additional sheets if necessary).
  6. Line 4 & 5: Type of Tax/Fee and Return
    Check the appropriate type (e.g., employment, excise, fee) and specify the related form (e.g., 1040, 941, branded prescription drug fee).
  7. Line 6–7: Penalty/Reason Details
    Provide IRC section if applicable and check the reason for your request.
  8. Line 8: Explanation
    Provide a clear, detailed explanation with facts, dates, and calculations. Attach all supporting documentation (IRS notices, evidence of reasonable cause, payment proofs). This section is critical for approval.

Signature: Sign and date the form. Both spouses sign joint claims. Include title for businesses. Paid preparers must complete their section.

Where to Mail Form 843?

Mailing addresses vary:

  • In response to an IRS notice — Use the address on the notice.
  • Estate/Gift tax claims — Internal Revenue Service Center, Attn: E&G, Stop 824G, 7940 Kentucky Drive, Florence, KY 41042-2915.
  • Branded Prescription Drug Fee — Write “Branded Prescription Drug Fee” across the top and mail to: Internal Revenue Service, Mail Stop 4921 BPDF, 1973 N. Rulon White Blvd., Ogden, UT 84404.
  • Most other penalties or general claims — Mail to the IRS service center where you file your current-year return for that tax type.

Keep copies and use certified mail with return receipt for proof of filing.

Tips for Success and Common Mistakes to Avoid

  • Attach strong supporting evidence (e.g., medical records, police reports for reasonable cause).
  • Be specific and factual — vague explanations often lead to denials.
  • Consider First-Time Abatement (FTA) if you have a clean compliance history.
  • Reasonable cause examples: Serious illness, natural disaster, or unavoidable absence.
  • Processing time: Several months — track your claim via IRS account or phone.
  • Seek help from a tax professional for complex cases or large amounts.

Special Situations

  • Excess Social Security/Medicare Tax — Employer must first refuse to adjust.
  • IRS Erroneous Written Advice — Under IRC Section 6404(f).
  • Visual Impairments — Additional relief available.
  • Net Interest Rate of Zero — For overlapping underpayments and overpayments.

Final Advice for Filing Form 843 Correctly

Following these IRS Form 843 instructions can help you successfully reduce or recover penalties, interest, or overpaid fees. Always use the official December 2024 revision and check IRS.gov/Form843 for the latest updates.

This article is for informational purposes only and is not tax advice. For personalized guidance, consult a qualified tax professional or enrolled agent.

Last updated: May 2026, based on current IRS publications.