Do you know what grinds my gears more than a mandatory sprint? Bookkeeping. Just yesterday, after panting through my annual Physical Readiness test (which I absolutely loathe), it struck me how similar my feelings are towards keeping meticulous financial records. But like running, it’s a necessary evil, especially if you’re a business owner gearing up for tax season.
However, let’s face it—sometimes life throws a wrench in our plans. Documents get lost, receipts fade away, or, heaven forbid, a disaster wipes out all our meticulous records. What then? Do we just roll over and let the IRS have its way with us? Not quite, thanks to a century-old lifesaver known as the Cohan Rule.
What is the Cohan Rule?
Cast your mind back to 1920s America. George M. Cohan, a legendary Broadway figure (you might know him from the song, “Give My Regards to Broadway”), found himself in hot water with the IRS. Despite his success, Cohan was no fan of detailed record-keeping. When audited, he lacked the documentation to support his claimed business expenses.
But instead of folding, Cohan fought back, and his case went all the way to the United States Court of Appeals. In a landmark decision, the court ruled in favor of Cohan, essentially stating that when a taxpayer can convincingly show that qualified expenses occurred, the IRS should estimate the allowed deduction rather than deny it outright just because specific records are missing.
Why Does the Cohan Rule Matter to You?
If you’ve skipped filing your taxes for the past few years and are now in a scramble to get your affairs in order, the Cohan Rule could be your unsung hero. Here’s why:
- Flexibility in Deductions: The Cohan Rule allows for tax deductions based on reasonable estimates if you can demonstrate that you genuinely incurred the expenses. This means that even if your record-keeping was less than perfect, you might still salvage significant deductions.
- Reducing Tax Liability: By enabling you to estimate and deduct legitimate business expenses, the Cohan Rule can substantially decrease your tax liability. This is crucial if you’re piecing together back tax returns and find yourself short on documentation.
- Empowering Negotiations: Knowing about the Cohan Rule arms you with valuable information that can be leveraged in discussions with the IRS. It shows that you’re informed and proactive, qualities that can influence the outcome of tax disputes.
How to Use the Cohan Rule Wisely
While the Cohan Rule is a powerful tool, it’s not a free-for-all. Here’s how to use it effectively:
- Be Reasonable: Your estimates must be plausible. Wild guesses won’t fly with the IRS.
- Show Evidence of Effort: Demonstrate that you’ve made a genuine attempt to track and document expenses, even if the records are incomplete.
- Consult a Professional: Navigating the complexities of IRS rules can be daunting. A tax professional can help you make the most of the Cohan Rule and ensure your estimates are defensible.
Conclusion
Just like how I’d rather run laps than do bookkeeping, sometimes we must tackle the less pleasant aspects of life head-on. If you’re dealing with back taxes and missing records, remember the Cohan Rule. It might just be the lifeline you need to turn a potential financial disaster into a manageable situation.
Need more insights or help applying the Cohan Rule to your tax situation? Dive deeper into tax strategies and solutions on my blog or reach out for personalized advice. Don’t let the fear of imperfect records keep you from taking control of your tax destiny.

Andrew Samaniego, EA, CTRC, MSCTA
Andrew Samaniego Tax Planning & Resolution
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