Failure-to-File vs Failure-to-Pay.

In plain English

These are two different IRS penalties that people often blur together. The failure-to-file penalty is 5% of the unpaid tax for each month or part of a month your return is late, up to 25%. The failure-to-pay penalty is much smaller, one-half of 1% of the unpaid tax per month, also capped at 25%. When both apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount, so the combined charge is 5% per month, not 5.5%. Because late filing costs ten times more per month than late paying, filing on time matters even when you cannot pay.

01Why it matters

If you cannot pay your full tax bill, filing on time anyway sidesteps the steep 5% per month late-filing penalty and leaves you with only the much gentler late-payment charge plus interest.

02The math, step by step

You owe $2,000 and file two months late without paying. The failure-to-file penalty is about 5% per month, but reduced by the failure-to-pay penalty in months they overlap, so roughly 4.5% plus 0.5% each month. Across two months that is around $200, versus only about $20 if you had filed on time and just paid late. If a return is more than 60 days late, a minimum failure-to-file penalty also applies: for returns due after December 31, 2025, that minimum is $525, or 100% of the tax owed if that is less.

03What this is NOT

04Receipts

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