Reasonable Cause: How to Write a Convincing IRS Letter

The IRS might sound intimidating, but they’re not heartless. If you have a valid excuse for missing a tax deadline, you may qualify for penalty relief—if you know how to write a strong reasonable cause letter.

What is a Reasonable Cause Letter?


It’s a written explanation sent to the IRS requesting relief from penalties. It must be factual, concise, and supported with documentation.

What to Include

  • Specific dates and events (e.g., hospitalization, natural disaster)

  • Explanation of how the event affected your tax duties

  • Steps taken to fix the issue and stay compliant moving forward

  • Supporting evidence (doctor’s notes, obituaries, insurance claims, etc.)

Common Mistakes to Avoid

  • Vague statements like “I was busy”

  • Blaming others without proof

  • Emotional pleas with no documentation

  • Missing the tone: respectful, not demanding

Call to Action


Want help crafting a winning letter? Grab our DIY template or book a consultation.

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What Is IRS Penalty Abatement? And Can You Qualify?