A reasonable excuse for a late tax return is an event outside your control that actually prevented you from filing on time, even though you exercised the care a reasonable person would have used in the same situation. The IRS calls this standard reasonable cause, and if you meet it, the agency will remove the failure-to-file penalty of 5% per month (capped at 25%) that would otherwise apply to your unpaid balance.1Internal Revenue Service. Failure to File Penalty You carry the burden of proof, so the question is not just whether something bad happened, but whether you can show it kept you from filing and that you filed as soon as you could afterward.
The Standard the IRS Applies
The Internal Revenue Manual defines reasonable cause as the level of care a reasonably prudent person would exercise under the same circumstances, described as “ordinary business care and prudence.”2Internal Revenue Service. IRM 20.1.1 Introduction and Penalty Relief – Section: 20.1.1.3.2 Reasonable Cause In practice, the IRS looks at four things: what the disruption was, how long it lasted, whether you tried to file once the obstacle cleared, and whether you took reasonable steps to protect your tax obligations while it continued. Someone hospitalized for three weeks who files days after discharge is in a much stronger position than someone who recovered in January and still had not filed by April.
Excuses That Qualify
The IRS recognizes several categories of events as reasonable cause. Each is decided on its own facts, but these are the situations that most often succeed.
Serious Illness, Injury, or Death in the Family
A serious illness, injury, or disability affecting you or an immediate family member qualifies when it left you physically or mentally unable to manage your financial affairs during the filing window.2Internal Revenue Service. IRM 20.1.1 Introduction and Penalty Relief – Section: 20.1.1.3.2 Reasonable Cause The death of a spouse, parent, or child also qualifies, particularly when caregiving or estate responsibilities consumed the filing period.3Internal Revenue Service. Penalty Relief for Reasonable Cause
Natural Disasters and Destroyed Records
A fire, flood, hurricane, tornado, or severe storm that destroys your records or displaces you from your home is one of the strongest grounds for relief.3Internal Revenue Service. Penalty Relief for Reasonable Cause The IRS expects physical safety and recovery to take priority over paperwork. If your tax documents were destroyed, you still need to show reasonable efforts to reconstruct them and file once you were able.
Unavoidable Absence
An event beyond your control that physically prevents you from reaching your records or filing can qualify. The IRS uses “unavoidable absence” broadly enough to cover situations like unexpected incarceration or sudden displacement.2Internal Revenue Service. IRM 20.1.1 Introduction and Penalty Relief – Section: 20.1.1.3.2 Reasonable Cause The absence must have been outside your control and must have directly prevented access to what you needed to file.
System or Software Failures
A technical failure in tax preparation software or an e-filing system that stopped a timely electronic submission counts as reasonable cause.3Internal Revenue Service. Penalty Relief for Reasonable Cause Save screenshots, error messages, rejection notices, and any correspondence with the software provider, and be ready to show that you filed as soon as the problem was fixed.
Incorrect Written Advice From the IRS
If you followed incorrect written advice from an IRS employee acting in an official capacity and that advice caused you to file late, the IRS is required to remove the resulting penalty. The agency has extended this relief administratively to some cases of erroneous oral advice as well.4Internal Revenue Service. IRM 20.1.1 Introduction and Penalty Relief – Section: 20.1.1.3.3.4.1 Written Advice From the IRS
Excuses That Do Not Qualify
Some explanations fail almost every time, and knowing which ones saves you from building a claim that cannot win.
Not knowing about the deadline. Ignorance of the law or of the filing due date is not reasonable cause. The Supreme Court has treated tax deadlines as publicly known.5Justia. United States v Boyle, 469 US 241 (1985)
Not having the money to pay. A lack of funds may excuse a late payment in some circumstances, but it does not excuse a late return. You can file on time showing a balance due even when you cannot pay.3Internal Revenue Service. Penalty Relief for Reasonable Cause
Your accountant or attorney missed the deadline. The Supreme Court decided this in United States v. Boyle. Filing on time is a personal, non-delegable duty. If you hired a professional to submit the return and they missed the date, you still owe the penalty, because knowing that returns have deadlines does not require tax expertise.5Justia. United States v Boyle, 469 US 241 (1985)
There is a narrower path inside that same ruling. If a tax professional gave you incorrect substantive advice about whether you were required to file at all, and you reasonably relied on it, that can be reasonable cause. The Court drew a line between trusting someone to perform a mechanical task (getting the return in the mail) and trusting a professional’s legal judgment on whether a filing obligation exists.6Legal Information Institute. United States v Boyle, Executor of the Estate of Boyle
An Easier Route When You Do Not Have a Strong Excuse
If nothing in your situation fits reasonable cause, you may still qualify for First-Time Penalty Abatement, an administrative waiver that is often faster to obtain. You need three things:
- A clean compliance history: you filed the same type of return for the three tax years before the penalty year and received no penalties during that period (or any prior penalties were removed for a reason other than First-Time Abatement).
- All currently required returns filed, or valid extensions in place.
- Any tax currently due paid, or a payment arrangement set up.
The waiver covers failure-to-file, failure-to-pay, and failure-to-deposit penalties.7Internal Revenue Service. Administrative Penalty Relief You do not need to prove any disruption occurred. Many First-Time Abatement requests can be resolved by phone. If you qualify for both First-Time Abatement and reasonable cause, it usually makes sense to use First-Time Abatement now and hold your reasonable cause facts in reserve for any future penalty.
How to Ask the IRS to Remove the Penalty
You have three practical ways to make the request.
Call the Number on the Notice
If a penalty notice has already arrived, calling the number printed on it is often the fastest option. Some requests, especially First-Time Abatement, can be handled in a single call. Have the notice, the penalty type, and your explanation in front of you. If the agent cannot approve the request on the phone, they will point you to a written submission.8Internal Revenue Service. Penalty Relief
Attach a Statement to the Late Return
If you have not yet filed the overdue return, attach a written reasonable cause explanation to it. Getting your justification in front of the IRS before the penalty is assessed can prevent the charge from posting to your account. Put the statement at the front of the return and label it clearly as a request for penalty abatement due to reasonable cause.
File Form 843
If the penalty has already been assessed and a phone call did not resolve it, file Form 843 (Claim for Refund and Request for Abatement) with the service center that processed your return.9Internal Revenue Service. About Form 843, Claim for Refund and Request for Abatement The form asks for your name, Social Security number, the tax period, and a detailed explanation. Use the explanation section to tie your evidence to specific dates. Vague narratives lose; specific documented facts win.
Documentation That Actually Helps
The IRS evaluates reasonable cause on facts and evidence, not sympathy. Match your records to the type of disruption you are claiming:
- Medical emergency: hospital records, physician letters, or discharge summaries showing when you were incapacitated and how it kept you from handling financial matters.
- Death in the family: the death certificate, plus records of your role in caregiving or estate administration during the filing window.
- Natural disaster: insurance claims, police reports, FEMA correspondence, or photographs of damage and dates of displacement.
- System failure: screenshots of error messages, rejected e-file confirmations, correspondence with the software provider, and the date you successfully filed after the issue resolved.
Two things need to be visible on the record: the event actually occurred during the filing window, and you filed as soon as you were able afterward. A three-month gap between recovering and filing weakens an otherwise strong claim.
Deadline to Request Relief
You generally have to file the abatement claim within three years from the date you filed the return or two years from the date you paid the tax, whichever is later.10Taxpayer Advocate Service. Tens of Millions of Taxpayers May Be Eligible for Significant Tax Refunds Wait longer than that and you can lose the right to relief even with a valid excuse.
If the IRS Denies Your Request
A denial letter will explain your appeal rights. You generally have 30 days from the date of the letter to file an appeal, which is heard by the IRS Independent Office of Appeals, a separate unit from the one that denied you.11Internal Revenue Service. Penalty Appeal Send a written explanation of the facts with your supporting documentation. If you have evidence you did not submit the first time, include it now, but be aware that introducing new material at appeal may send the file back to the original unit and slow things down. The strongest appeals point to evidence the initial reviewer overlooked or misweighed.