Reasonable cause for a late filing penalty means convincing the IRS that you exercised ordinary business care and prudence but were still unable to file your return on time because of a specific circumstance tied to that period. The standard is fact-driven: the agency weighs what happened, when it happened, how directly it prevented you from filing, and how quickly you filed once the obstacle passed. A strong claim connects a documented event to the exact months you missed. A weak claim leans on general hardship, forgetfulness, or someone else’s mistake.
What the IRS Means by Ordinary Business Care and Prudence
The Internal Revenue Manual frames reasonable cause around a single question: did you try to meet your obligations and get stopped by something you couldn’t reasonably overcome?1Internal Revenue Service. IRM 20.1.1 Introduction and Penalty Relief – Section: 20.1.1.3.2 Reasonable Cause Evaluators look at the whole picture, not just the event you point to.
Two things get scrutinized more than taxpayers expect. First, the timing has to line up. If you were hospitalized for three weeks in March but didn’t file until November, the unexplained gap after your recovery does most of the damage to the claim. Second, the IRS checks whether you handled other responsibilities during the same window. Someone who ran a business, paid other bills, and traveled during the period they say they couldn’t file will struggle to argue the delay was unavoidable.
Circumstances That Generally Support a Claim
Serious Illness, Incapacity, or Death in the Family
A medical emergency affecting you or a close family member is one of the most commonly accepted grounds. The IRS looks for a condition that directly prevented you from gathering records, making decisions, or completing the return. Hospitalization or round-the-clock care carries more weight than a condition that was manageable during the filing period. The same reasoning applies when you were caring for a dying relative or handling estate matters after a death.
Natural Disasters and Casualty Events
Fires, floods, and other disasters that destroy financial records qualify. When FEMA issues a federal disaster declaration, the IRS typically grants automatic extensions and penalty relief for taxpayers in the affected area, coding accounts by zip code so relief often applies without a request.2Internal Revenue Service. FAQs for Disaster Victims Casualties outside a declared disaster can still support reasonable cause, but you’ll need to document the event and its effect yourself.
Erroneous Written Advice from the IRS
If you sent the IRS a written question, gave accurate information, and reasonably relied on an incorrect written response, penalties tied to that advice can be abated under IRC 6404(f). Verbal advice from an IRS phone representative does not qualify, which is why tax professionals push clients to get anything material in writing.
Circumstances That Rarely Succeed
Not Having the Money
Inability to pay does not excuse a failure to file. The filing obligation exists whether or not you can write a check. You can file a return showing a balance due and address the payment separately through an installment agreement. Financial hardship can occasionally support relief from the failure-to-pay penalty, but only if the hardship genuinely prevented payment rather than making it inconvenient.
Relying on a Preparer to File
The Supreme Court settled this in United States v. Boyle: the duty to file on time is non-delegable. Handing your documents to an accountant who then misses the deadline is not reasonable cause.3Legal Information Institute. United States v. Boyle, Executor of the Estate of Boyle The rule extends to e-filed returns. If your preparer transmits a return and the IRS rejects it for a technical error, you remain responsible, even though rejection notices go back through the software to the preparer rather than to you.
There is one meaningful distinction. You cannot delegate the act of filing, but you can rely on a professional’s substantive tax advice. If your accountant told you a return wasn’t required and that advice was reasonable on its face, that is a different argument than “my preparer said he would mail it.”
Forgetting or Being Too Busy
Losing track of the deadline, mislaying the notice, or being overwhelmed by work does not meet the ordinary business care standard. The IRS treats these as failures of personal organization.
Check First-Time Abate Before You Build the Case
Before the IRS considers reasonable cause, it checks whether you qualify for First-Time Abate, an administrative waiver that removes the penalty based on your compliance history rather than any hardship story.4Internal Revenue Service. Administrative Penalty Relief You qualify if you filed the same type of return (or weren’t required to file) for the three prior years, had no penalties in that window (or any penalty was removed for a reason other than First-Time Abate), and are current on all required filings or have a valid extension in place.
The waiver covers the failure-to-file penalty, the failure-to-pay penalty, and the failure-to-deposit penalty for employment taxes. It does not cover penalties tied to event-based filing requirements or certain information-return penalties.
One strategic point. The IRS applies First-Time Abate automatically if your account qualifies, even when you specifically request reasonable cause. If your reasonable cause argument is strong and the penalty is small, you may prefer to preserve the waiver for a future year when you won’t have a hardship to point to. Say so plainly in your request if that’s what you want.
How to Submit a Reasonable Cause Request
By Phone
The simplest path is calling the toll-free number on your penalty notice. For straightforward matters the agent can review your account and, in some cases, approve relief during the call.5Internal Revenue Service. Penalty Relief Reasonable cause cases with documentation usually get routed to a written submission instead.
In Writing or on Form 843
For a reasonable cause request backed by documents, send either a signed letter or Form 843, Claim for Refund and Request for Abatement.6Internal Revenue Service. Form 843 – Claim for Refund and Request for Abatement Identify the tax period, the specific penalty, and the reason you couldn’t comply. Form 843 is signed under penalties of perjury. If you’ve already received a penalty notice, use the address on the notice, and send everything by certified mail with return receipt.
Watch the Statute of Limitations
If you already paid the penalty and want a refund, you generally have three years from the date you filed the return or two years from the date you paid the penalty, whichever is later.7Internal Revenue Service. Instructions for Form 843 Miss that window and the refund is gone. Unpaid penalties can be contested as long as the IRS is still collecting, but waiting only lets interest accumulate.
Documentation That Actually Carries Weight
Evidence often matters more than the severity of the hardship. Vague claims are easy to deny. Records tied to specific dates are much harder to brush aside.
For medical issues, collect hospital admission and discharge records, physician letters describing the condition and how long it affected you, and anything showing you couldn’t manage your affairs during that period. For a death in the family, include the death certificate and records showing your role in the care or estate. For property damage, gather insurance claims, police or fire reports, and photographs. If records were destroyed, a letter from your insurer confirming the loss helps establish the timeline.
Your written explanation is the heart of the request. State what happened, when it happened, exactly how it prevented you from filing, and what you did once the obstacle passed. The IRS wants to see prompt action after the hardship ended. A three-week hospitalization followed by a return filed the week you got home is a coherent story. The same hospitalization followed by a six-month gap is not.
Interest Keeps Running Even If Penalties Are Removed
Reasonable cause is not a basis for abating interest on the underlying tax.8Internal Revenue Service. IRM 20.2.7 Abatement and Suspension of Underpayment Interest Even if every dollar of penalty comes off, interest that accrued from the original due date stays. Interest is only reduced in narrow situations involving IRS error, such as an unreasonable processing delay caused by an agency employee.9Office of the Law Revision Counsel. 26 USC 6404 – Abatements A successful abatement request cleans up the penalty column, not the balance due.
If the IRS Denies the Request
The IRS typically responds in 30 to 60 days with a written decision. If it denies the request, you can appeal to the Independent Office of Appeals by filing a written protest, which gets your case a fresh review by someone outside the original decision.10Internal Revenue Service. What to Expect from the Independent Office of Appeals Penalty appeal conferences are usually handled by phone or correspondence, though in-person meetings can be requested.11Internal Revenue Service. IRM 8.11.4 Penalty Appeals (PENAP) Use the appeal to fill the gaps the first denial identified: address the specific reasoning in the denial letter and add any evidence you’ve gathered since.