The reasonable-cause letter is the substantive heart of a Form 843 abatement request. The form itself is procedural — names, addresses, tax periods, the dollar amount of penalties contested. The letter is what persuades the IRS examiner that the facts of your case meet the legal standard for abatement under IRC §6651(a)(1) and the corresponding sections of the Internal Revenue Manual. A well-drafted letter, paired with proper substantiation, is granted at a high rate; a vague or undocumented letter is denied.
The five templates below cover the reasonable-cause scenarios that account for the overwhelming majority of successful abatement requests we file: serious illness of the responsible party, a federally declared natural disaster, destruction of records, reliance on incorrect advice from a tax professional, and prolonged inability to obtain records from a third party. Each template follows the same four-part structure the IRS expects — a statement of facts, a timeline, an explanation of why ordinary business care and prudence were exercised, and a description of corrective action. Adapt the specifics to your circumstances. Do not change the structure.
What every reasonable-cause letter must contain
Before the templates, the procedural floor. Every reasonable-cause letter the IRS accepts has the following elements. Missing any one of them is the most common reason for denial.
- Taxpayer identification — legal name, EIN or SSN, address, tax period, and the specific penalty being contested.
- A clear statement that abatement is requested under reasonable cause, citing IRC §6651(a)(1) (or the corresponding section for the penalty type at issue).
- A chronological narrative of the qualifying circumstance, with specific dates that bracket the filing or payment deadline at issue.
- An explanation of why the circumstance prevented compliance despite ordinary business care and prudence.
- A description of corrective action — when the obstacle was removed, the return was filed or the tax was paid.
- A list of supporting documentation attached to the letter, each item tabbed and labeled.
- Signature of the taxpayer or authorized representative, with the corresponding Form 2848 or Form 8821 referenced.
Specificity is the difference between grant and denial. The IRS examiner reviewing your letter is comparing your facts against the standard in IRM 20.1.1.3.2 — "ordinary business care and prudence." Generalities ("I was unwell that year") fail the standard. A dated medical record showing a hospitalization that overlaps the filing deadline succeeds. The five templates below model that level of specificity throughout.
Template 1 — Serious illness of the responsible party
Use when the taxpayer or the individual within the business primarily responsible for tax matters experienced a serious medical event that overlapped the filing deadline. Attach hospital admission records, physician statements, or discharge summaries that establish the dates and severity.
[Date]
Internal Revenue Service
[Service Center Address]
Re: Request for Penalty Abatement Under Reasonable Cause
Taxpayer: [Legal Name] · EIN: [XX-XXXXXXX]
Tax Period: [e.g., Form 1120, Year Ending 12/31/2022]
Penalty Contested: Failure to File — $[Amount]
To Whom It May Concern:
I respectfully request abatement of the failure-to-file penalty assessed against [Taxpayer Name] for the tax period referenced above, on the grounds of reasonable cause under IRC §6651(a)(1). The cause of the late filing was a serious medical event that prevented me — the individual within the company solely responsible for tax compliance — from performing my duties during the period leading up to and including the filing deadline.
On [Date], I was admitted to [Hospital Name] for [diagnosis or procedure], and remained hospitalized through [Date]. Following discharge, I was under physician-directed restrictions through [Date], during which I was unable to perform the cognitive and administrative tasks required to compile the company's books, work with our accountant, and authorize the filing. The original return deadline was [Date], which fell within this period of incapacity. The return was filed on [Date], promptly after I was cleared to resume normal duties.
I exercised ordinary business care and prudence in the months preceding this event by maintaining a routine compliance calendar and a working relationship with [Accountant or Bookkeeper]. The medical event was unforeseeable and prevented me from completing the final review and authorization that only I, as [title], am authorized to perform on behalf of the company. No other officer of the company holds that authority.
In support of this request, I am attaching: (Exhibit A) hospital admission and discharge records; (Exhibit B) a letter from [Physician Name] documenting the period of incapacity; (Exhibit C) a copy of the filed return showing the date of submission.
I respectfully request that the failure-to-file penalty be abated in full, along with any interest assessed on that penalty.
Sincerely,
[Signature]
[Name, Title]
[Phone] · [Email]
Template 2 — Federally declared natural disaster
Use when a hurricane, wildfire, flood, tornado, or other federally declared disaster physically affected the taxpayer's premises, the records, or the responsible individual. Attach the FEMA disaster declaration, insurance correspondence, and any IRS disaster-relief notices applicable to your county.
[Date]
Internal Revenue Service
[Service Center Address]
Re: Request for Penalty Abatement Under Reasonable Cause
Taxpayer: [Legal Name] · EIN: [XX-XXXXXXX]
Tax Period: [Form and Year]
Penalty Contested: [Failure to File / Failure to Pay] — $[Amount]
To Whom It May Concern:
I respectfully request abatement of the [penalty type] penalty assessed against [Taxpayer Name] for the tax period referenced above, under reasonable cause pursuant to IRC §6651(a)(1). The late filing resulted from [Disaster Name], a federally declared disaster designated FEMA-[XXXX]-DR-[State] on [Date], which directly affected the company's principal place of business in [County, State].
On [Date], [Disaster Name] caused [specific damage — flooding of office, structural damage, evacuation order, etc.] at our offices located at [Address]. The premises were inaccessible from [Date] through [Date]. During this period, the company's tax records — including ledgers, payroll files, and source documents required to complete the return — were [destroyed / inaccessible / damaged beyond use]. The original return deadline of [Date] fell within this period.
Once the premises were reopened on [Date], we immediately engaged [Accountant Name] to reconstruct the affected records from bank statements, vendor confirmations, and customer-side documentation. That reconstruction was completed on [Date], and the return was filed [Date]. The company also notified the IRS of its presence in the disaster area at the earliest opportunity.
The company exercised ordinary business care and prudence both before and after the disaster: prior compliance was timely, records were stored on-site in accordance with industry practice, and reconstruction efforts began immediately upon reentry.
Attached: (Exhibit A) FEMA disaster declaration covering the affected county; (Exhibit B) photographs and insurance correspondence documenting the damage to the company's premises; (Exhibit C) records-reconstruction memorandum from [Accountant Name]; (Exhibit D) filed return and proof of mailing.
I respectfully request that the penalty and any interest assessed thereon be abated in full.
Sincerely,
[Signature]
[Name, Title]
Template 3 — Destruction of records
Use when records were destroyed by fire, flood, theft, server failure, or other casualty unrelated to a federally declared disaster. The standard here is higher than for FEMA-declared events — the IRS will look closely at whether records were stored with ordinary care and whether reconstruction was prompt.
[Date]
Internal Revenue Service
[Service Center Address]
Re: Request for Penalty Abatement Under Reasonable Cause
Taxpayer: [Legal Name] · EIN: [XX-XXXXXXX]
Tax Period: [Form and Year]
Penalty Contested: [Penalty Type] — $[Amount]
To Whom It May Concern:
I respectfully request abatement of the [penalty type] penalty assessed against [Taxpayer Name] under reasonable cause pursuant to IRC §6651(a)(1). The cause of the late filing was the destruction of the company's tax records in [a fire / a burst-pipe flood / a server failure / a burglary] on [Date], and the time required to reconstruct those records before the return could be completed.
On [Date], [describe the casualty event in factual detail — how it occurred, what was destroyed, what evidence exists]. The records destroyed included [general ledger, accounts receivable and payable detail, payroll records, bank reconciliations, vendor invoices] for the tax year at issue. A police report was filed on [Date] (Report #[XXXX]); [insurance carrier] was notified the same day and opened claim #[XXXX].
The company maintained records in accordance with industry practice: [describe storage practices — locked filing cabinet, encrypted backup, off-site copy program, etc.]. The casualty was unforeseeable and outside the company's control. Records reconstruction began immediately on [Date] using [bank statements, vendor confirmations, customer copies of issued documents, third-party payroll provider records]. The reconstruction was completed on [Date] and the return was filed promptly thereafter on [Date].
Attached: (Exhibit A) [police / fire / insurance] report; (Exhibit B) photographs of the affected records or premises; (Exhibit C) records-reconstruction log identifying the source of each reconstructed item; (Exhibit D) filed return and proof of mailing.
I respectfully request that the penalty and any associated interest be abated in full.
Sincerely,
[Signature]
[Name, Title]
Template 4 — Reliance on incorrect advice from a tax professional
Use when the taxpayer relied on written advice from a qualified tax professional — Enrolled Agent, CPA, or tax attorney — and that advice led directly to the noncompliance. The IRS sets a high bar here: the professional must have been competent, the taxpayer must have provided complete and accurate information, and the reliance must have been reasonable. Reliance on a tax-preparation software product or on a non-credentialed bookkeeper does not qualify.
[Date]
Internal Revenue Service
[Service Center Address]
Re: Request for Penalty Abatement Under Reasonable Cause
Taxpayer: [Legal Name] · EIN: [XX-XXXXXXX]
Tax Period: [Form and Year]
Penalty Contested: [Penalty Type] — $[Amount]
To Whom It May Concern:
I respectfully request abatement of the [penalty type] penalty assessed against [Taxpayer Name] under reasonable cause pursuant to IRC §6651(a)(1) and Treas. Reg. §301.6651-1(c). The late [filing / payment] was the direct result of incorrect written advice received from [Tax Professional Name], a [credential — CPA, Enrolled Agent, attorney] retained by the company in [Year] to handle our federal tax compliance.
On [Date], in response to my inquiry regarding the filing deadline for [Form / Tax Year], [Tax Professional Name] advised in writing that [describe the specific incorrect advice — that an extension was on file, that the deadline was a different date, that a particular form was not required, etc.]. A copy of that written advice is attached as Exhibit A. I provided [Tax Professional Name] with all relevant facts, including [list — entity type, gross receipts, prior-year filings, etc.], at the time the advice was given. The advice was incorrect: [explain the actual rule and how it differed from the advice].
I relied on this advice in good faith. [Tax Professional Name] held the credentials of a [CPA / EA / attorney] in good standing at the time, had handled the company's tax matters for [number] years without prior issue, and was selected based on [referral / due diligence performed]. I had no reason to question the accuracy of the advice. The error came to the company's attention on [Date] when the IRS notice CP[XXX] was received, at which point we engaged new counsel and filed the correct return on [Date].
Attached: (Exhibit A) the incorrect written advice from [Tax Professional Name]; (Exhibit B) my email or correspondence providing the underlying facts; (Exhibit C) verification of [Tax Professional Name]'s credentials and standing at the relevant time; (Exhibit D) the corrected filing.
I respectfully request that the penalty and associated interest be abated in full.
Sincerely,
[Signature]
[Name, Title]
Template 5 — Prolonged inability to obtain records from a third party
Use when the taxpayer was unable to file because a third party — a former bookkeeper, payroll provider, brokerage, partnership, or government agency — failed to provide records the taxpayer needed and had a right to receive. The letter must document that the taxpayer requested the records promptly, escalated the request, and pursued reasonable alternatives.
[Date]
Internal Revenue Service
[Service Center Address]
Re: Request for Penalty Abatement Under Reasonable Cause
Taxpayer: [Legal Name] · EIN: [XX-XXXXXXX]
Tax Period: [Form and Year]
Penalty Contested: [Penalty Type] — $[Amount]
To Whom It May Concern:
I respectfully request abatement of the [penalty type] penalty assessed against [Taxpayer Name] under reasonable cause pursuant to IRC §6651(a)(1). The late filing was caused by the prolonged refusal or failure of [Third Party — former bookkeeper, payroll provider, brokerage, partnership, government agency] to deliver records the company required, and to which it was legally entitled, in order to complete the return.
The company engaged [Third Party] to handle [function] from [Date] through [Date]. Following the [end of engagement / change in service], the company requested return of [specific records — books, payroll detail, K-1, 1099, 1098-T, etc.] in writing on [Date]. Despite repeated follow-up — by email on [Dates], by certified letter on [Date], and by phone on [Dates] — the records were not produced until [Date]. A complete log of these requests is attached as Exhibit A.
During the period of nondelivery, the company explored every reasonable alternative source: [bank statements were obtained from the depositary, vendor confirmations were requested directly, [Government Agency] was petitioned for transcripts, etc.]. These alternatives partially mitigated the gap but were not sufficient to complete the return. The original deadline of [Date] therefore passed before the records were available. The return was filed on [Date], promptly after [Third Party] delivered the missing records.
The company exercised ordinary business care and prudence by engaging a [credential] for the underlying service, by maintaining the engagement on commercially reasonable terms, and by initiating recovery of the records as soon as they were needed for compliance. The delay was caused entirely by the third party.
Attached: (Exhibit A) chronological log of records requests with copies of each; (Exhibit B) certified mail receipts; (Exhibit C) records of alternative-source inquiries; (Exhibit D) the filed return.
I respectfully request that the penalty and associated interest be abated in full.
Sincerely,
[Signature]
[Name, Title]
Pairing the letter with Form 843
The reasonable-cause letter is filed as an attachment to Form 843. On Form 843 itself, line 5a is checked for the appropriate ground, line 7 references the attached statement of facts, and the letter is included as the substantive attachment. The package — Form 843, the letter, and all exhibits — is mailed to the IRS service center associated with the taxpayer's state and case type. See where to mail Form 843 for the current addresses.
For business clients with multiple tax years or larger refund amounts, our practice prepares the complete package — transcripts, Form 843, the reasonable-cause statement, exhibits, and the cover letter to the service center — on a contingency basis. If we don't recover, you don't pay. Or — adapt one of the templates above and file it yourself. Either path is legitimate.