Specific Types of Representation · Penalties and/or Interest Abatement
Procedures for requesting abatement
tax year · reviewed 2026-08-18 · I. Ohu
Form 843 is the vehicle, and knowing what it cannot do matters more than what it can. It is not an amended return, not the route to an income tax refund, and not available for an income, estate or gift tax abatement at all. Most exam questions here are exclusion questions.
The rule
Purpose. Use Form 843 to claim a refund or request an abatement of certain taxes, penalties, additions to tax, interest, and fees. The income tax bar it recites has a statutory root (IRC § 6404(b)).
What it may not be used for — the instructions give the exclusions in one paragraph, and each is examinable. Not to request an abatement of income, estate, or gift tax. Not to request a refund of income tax or Additional Medicare Tax. Employers cannot use it for a refund or abatement of FICA tax, RRTA tax, or income tax withholding. Not to amend a previously filed income or employment tax return. And not to claim a refund of agreement fees, offer-in-compromise fees, or lien fees.
What it is used for. The taxpayer checks one box at the top of the form. The reasons include an abatement or refund of tax other than income, estate or gift tax; an employee’s refund of excess social security, Medicare or RRTA tax withheld by one employer or such tax withheld in error — in either case only if the employer will not adjust the overcollection; excess tier 2 RRTA tax where there was more than one railroad employer; tier 1 RRTA tax for an employee representative; a penalty or addition to tax due to reasonable cause or other reason allowed under the law — expressly including the § 6676 erroneous-claim penalty, whose rate is in the figures table; the § 6672 trust fund recovery penalty; the § 6695A appraisal penalty; the § 6715 dyed-fuel penalty; a penalty caused by erroneous IRS written advice under § 6404(f); interest due to IRS error or delay under § 6404(e)(1); and a net interest rate of zero request.
Who may file. The taxpayer, or an authorised representative — in which case the original or a copy of Form 2848 must be attached, signed by the taxpayer and authorising the representative for the purposes of the request. A legal representative filing for a decedent whose return they filed attaches a statement to that effect; one who did not file it attaches certified copies of letters testamentary, letters of administration, or similar evidence. Form 1310 is filed with Form 843 by a decedent’s legal representative.
One form per period. Generally a separate Form 843 is required for each tax period or fee year or type of tax or fee. Two exceptions: a net interest rate of zero request, and a § 6404(e)(1) claim where the IRS’s error or delay in a single managerial or ministerial act affected multiple tax years or types of tax — there one form is filed with the applicable boxes checked on line 4 and the explanation on line 8. Timing: a claim for credit or refund must generally be filed within the period in the figures table, and the § 6404(f) route has its own window, also in the table.
Signatures. A Form 843 relating to a joint return must be signed by both spouses; a corporation’s by an officer authorised to sign, with the title included; an estate’s or trust’s by the fiduciary. A paid preparer who files it must sign, complete the identifying information and give the taxpayer a copy; someone who prepares it without charge should not sign.
A § 6404(e)(1) interest claim takes lines 1 through 4, the dates of any payment on line 3, box a on line 7, and on line 8: the type of tax; when the IRS first notified the taxpayer in writing about the deficiency or payment; the specific period claimed; the circumstances; and the reasons why failure to abate would result in grossly unfair treatment.
A § 6404(f) written-advice claim takes lines 1 through 4, the payment date on line 3 if paid, the Code section on line 6, box b on line 7, and three attachments: the taxpayer’s written request for advice, the erroneous written advice the IRS furnished, and the report, if any, of tax adjustments identifying the penalty and the items relating to that advice.
Where to file. In response to an IRS notice, to the return address from which the notice was sent. A net-interest-rate-of-zero request goes to the service center where the most recent return was filed. Estate and gift matters, the branded prescription drug fee, the health insurance provider fee and nonresident alien social security refunds each have their own address.
Lines. Line 6 takes the Code section for the assessed penalty, from the Notice of Assessment; line 7 the reason box; line 8 the explanation and computation, with evidence attached.
Current figures
| Item | Rule | Authority |
|---|---|---|
| Claim period | generally 3 years from the date the original return was filed or 2 years from the date the tax was paid, whichever is laterTY2026 | Instructions; IRC § 6511(a) |
| § 6404(f) window | the request must be submitted within the period allowed for collection of the penalty or addition to tax, or the penalty must have been paid within the period allowed for claiming a credit or refund of itTY2026 | Instructions; IRC § 6404(f) |
| § 6676 rate | 20% of the amount determined to be excessive, on an erroneous claim for refund or creditTY2026 | IRC § 6676(a) |
| Forms per period | One per period, fee year or type of tax — two exceptions | Instructions |
| Representative filing | Form 2848, original or copy, attached | Instructions |
How it works in practice
Learn the exclusions first. The most common error is reaching for Form 843 to abate income tax, and the instructions are explicit that it may not be used for that — reflecting IRC § 6404(b), which bars a claim for abatement of any subtitle A or B assessment. An income tax refund goes on Form 1040-X; a return is amended on the appropriate amended return; an employer’s overpaid FICA or withheld income tax goes on the 94X-X series.
Note the asymmetry inside the employment tax exclusions. An employer cannot use Form 843 for FICA, RRTA or withheld income tax at all. An employee can — but only for excess or erroneously withheld social security, Medicare or RRTA tax, and only if the employer will not adjust the overcollection.
The § 6676 penalty is on the form’s own list. A taxpayer penalised for an excessive refund claim may use Form 843 to seek abatement where the claim was due to reasonable cause — the same defence § 6676(a) builds into the penalty, which applies “unless it is shown that the claim for such excessive amount is due to reasonable cause.” Form and statute point the same way.
The exceptions to one-form-per-period have a logic. The general rule is administrative — each period is a separate assessment. The § 6404(e)(1) exception exists because a single IRS error can span several years, and separate forms would fragment one factual account. Note the condition precisely: one error or delay in a single act affecting multiple years, not several errors across several years.
The interest claim has a required narrative, and one element is not in the statute. The instructions ask for “the reasons why you believe that failure to abate the interest would result in grossly unfair treatment.” That phrase appears nowhere in IRC § 6404 or Reg. § 301.6404-2 — both of which turn on unreasonable error or delay in a ministerial or managerial act, with no fairness element. Treat it as what the IRS wants in the explanation, not as a statutory test to be conceded.
The written-advice route is documentary. A § 6404(f) claim lives or dies on the three attachments. Section 6404(f)(2) requires the advice to have been reasonably relied upon and in response to a specific written request, and that the penalty did not result from the taxpayer’s failure to provide adequate or accurate information — so the request document proves both that a request existed and what it contained.
Representation requires the Form 2848 attached — not merely on file. A power of attorney whose line 3 does not cover the penalty or period at issue will not carry the claim.
One error, four years
An examination covering 2020 through 2023 stalls for fourteen months after the group manager approves a transfer of the case and nobody effects it. Interest accrues in all four years, and the representative prepares four Forms 843.
Analysis. One will do. The instructions provide that only one Form 843 is filed where the interest assessment resulted from the IRS's error or delay in a single managerial or ministerial act affecting a tax assessment for multiple tax years — their own example being two or more years under examination. The applicable boxes go on line 4, the explanation on line 8.
The employer who will not adjust
Social security tax was withheld in error from an employee's pay. The employee asks the employer to correct it; the employer declines. The employee wants the tax back.
Analysis. Form 843 is now available to the employee. The instructions permit an employee's claim for social security, Medicare or RRTA tax withheld in error but only if the employer will not adjust the overcollection — the employer's refusal is a precondition, not an obstacle. Had the employer agreed, the route would not have opened. Note the mirror image: the employer could not use Form 843 for this at all.
The advice the client never asked for in writing
A taxpayer telephoned the IRS, was told a distribution was not taxable, and later received a letter from an IRS employee repeating it. An accuracy-related penalty follows, and the representative files a Form 843 under § 6404(f) attaching the letter.
Analysis. Incomplete, and probably fails. IRC § 6404(f)(2)(A) requires the advice to have been in response to a specific written request of the taxpayer, and the instructions require that written request to be attached. A telephone enquiry followed by an unsolicited letter does not satisfy it. The remaining argument is ordinary reasonable cause, made on line 8 with box d checked.
Form 843 cannot abate income, estate or gift tax. Nor claim an income tax refund, nor amend a return. IRC § 6404(b) is the statutory root of the abatement bar.
The employee’s route opens only when the employer’s closes. An employee may claim excess or erroneously withheld social security, Medicare or RRTA tax only if the employer will not adjust the overcollection — and an employer may not use Form 843 for these at all.
“Grossly unfair treatment” is an instruction, not a statute. The phrase appears in the Form 843 instructions and in neither IRC § 6404 nor Reg. § 301.6404-2. The statutory test is unreasonable error or delay in a ministerial or managerial act.
How this has changed
The instructions carry a December 2024 revision date and were last reviewed on 30 April 2026, and their “What’s New” says only: “Redesigned. We have redesigned Form 843 and these instructions.” That is the change worth knowing. The reason for filing now sits in a checkbox at the top of the form, where earlier versions relied more on line 7 and the narrative. Anyone working from a pre-2024 version is looking for a structure the form no longer has.
Two exclusions are newer than the form itself: Additional Medicare Tax entered the list after IRC § 3101(b)(2) took effect in 2013, and the bar on refunding agreement, offer-in-compromise or lien fees reflects the growth of those user fees, not any change in § 6404.
The § 6676 penalty is recent and its standard has moved. As enacted in 2007 it applied unless the claim had a reasonable basis; the standard is now reasonable cause, which is what both the statute and the instructions say. Material describing a reasonable-basis test for § 6676 is describing repealed law.
One boundary: the instructions are procedural and cannot enlarge the substantive right. Whether interest is abatable is decided by § 6404(e) and Reg. § 301.6404-2.
Exam focus
Know the exclusions cold: no abatement of income, estate or gift tax; no income tax refund; no amending a return; employers cannot use it for FICA, RRTA or withheld income tax; no refund of agreement, offer-in-compromise or lien fees. And that an employee may claim excess or erroneously withheld social security, Medicare or RRTA tax only if the employer will not adjust the overcollection.
Know that a separate Form 843 is generally required for each period or type of tax, with two exceptions — a net-interest-rate-of-zero request, and a § 6404(e)(1) claim where a single ministerial or managerial error affected multiple years. Know the general claim period in the figures table, that a representative must attach Form 2848, and that both spouses sign a joint-return claim.
Know that the § 6672, § 6676, § 6695A and § 6715 penalties are all on the form’s list.
Check yourself
1. Which may not be requested on Form 843? (A) Abatement of the § 6672 trust fund recovery penalty (B) Abatement of income tax (C) Abatement of interest under § 6404(e)(1) (D) Refund of the § 6715 dyed-fuel penalty Answer: B. The instructions bar abatement of income, estate or gift tax — reflecting IRC § 6404(b). The other three are on the form’s own list.
2. An employee had social security tax withheld in error. When may the employee file Form 843? (A) At any time within the claim period (B) Only if the employer will not adjust the overcollection (C) Only if the employer files first (D) Never; only the employer may claim it Answer: B. And note the mirror image — an employer may not use Form 843 for FICA, RRTA or withheld income tax at all.
3. A single IRS delay in one ministerial act caused interest to accrue across three tax years. How many Forms 843 are required? (A) One for each year (B) One, with the applicable boxes checked on line 4 (C) One for each type of tax (D) None; interest claims use Form 1040-X Answer: B. This is one of the two exceptions to the one-form-per-period rule, the other being a net-interest-rate-of-zero request.
4. What must a representative attach when filing Form 843 for a client? (A) A signed engagement letter (B) The original or a copy of Form 2848 authorising the representative for the request (C) A Form 8821 (D) Nothing, if a power of attorney is already on the CAF Answer: B. The instructions require it attached to the Form 843, not merely on file.
5. The instructions ask a § 6404(e)(1) claimant to explain why failure to abate would be “grossly unfair treatment.” What is that requirement’s status? (A) A statutory element of § 6404(e) (B) A requirement of Reg. § 301.6404-2 (C) A narrative requirement of the instructions only — the statutory test is unreasonable error or delay in a ministerial or managerial act (D) The § 6404(h) standard of review Answer: C. The phrase appears in neither the statute nor the regulation. Section 6404(h) review is for abuse of discretion.
Change log
- Initial publication from the Instructions for Form 843 (rev. 12/2024) and IRC §§ 6404, 6511 and 6676.