Failure-to-File Penalty: Rate, Cap, and Minimum Charge

The IRS failure to file penalty is 5% of your unpaid tax for each month or partial month your return is late, capped at 25% of what you owe. The cap is reached after five months. If you’re due a refund, the penalty doesn’t apply at all — it’s calculated against a balance due, not against the return itself.¹

How the 5% Monthly Charge Is Calculated

The clock starts the day after your return’s due date passes without the IRS receiving it. For most individuals that date is April 15.

There is no proration within a month. A return filed one day late costs the same 5% as one filed 29 days late. On a $10,000 balance, missing the deadline by a single day triggers a $500 penalty on the spot.²

Each additional month adds another 5% of the original unpaid tax. Two months costs $1,000 on that $10,000 balance; three months, $1,500. The percentage always applies to the tax you owed on the due date, not to a growing penalty balance, so the charge is linear rather than compounding.

The 25% Cap

The penalty stops growing at 25% of your unpaid tax, which it hits after five full months of delinquency.¹ On a $10,000 balance, the ceiling is $2,500, whether you file six months late or six years late.

The cap is applied per tax year. Two years of missing returns produce two separate penalty calculations, each with its own 25% ceiling against that year’s balance.

The Minimum Penalty for Returns More Than 60 Days Late

Once your return is more than 60 days past due, a floor kicks in. For returns due after December 31, 2025, that minimum is $525 or 100% of your unpaid tax, whichever is less.¹

The floor matters for small balances. If you owe $300 and file 65 days late, the penalty is $300, because 100% of the tax is less than $525. If you owe several thousand dollars, the 5%-per-month math already exceeds $525 well before day 60, so the floor never binds. The dollar figure adjusts periodically for inflation; it was $485 for 2024 returns and $510 for 2025 returns.¹

When You Owe Both the Filing and Payment Penalties

Most people who file late also haven’t paid. Both penalties run at the same time: 5% per month for late filing and 0.5% per month for late payment. To keep the combined rate from spiking to 5.5%, the IRS reduces the failure-to-file portion to 4.5% during any month both apply, so the monthly total stays at 5%.³

On a $2,000 balance, the first month’s combined charge is $100 — $90 for late filing and $10 for late payment. After five months the failure-to-file penalty reaches its 25% cap and stops. The failure-to-pay penalty keeps running at 0.5% per month until it reaches its own 25% cap.¹

Add the two ceilings together and the maximum penalty exposure is 47.5% of the unpaid tax: 22.5% for late filing (25% minus the 2.5% offset spread across the five overlap months) plus 25% for late payment. That’s $4,750 on a $10,000 balance, before interest.

Interest Runs on Top

Interest accrues on unpaid tax from the original due date until you pay in full, and it compounds daily. The individual underpayment rate is 7% per year for the first quarter of 2026, and the IRS resets it each quarter based on the federal short-term rate plus three percentage points.⁴

Interest also accrues on the penalties themselves after they’re assessed. Unlike penalties, the IRS has almost no authority to waive interest; it can only shrink if the underlying penalty is removed. That’s why filing and paying as soon as you can matters even when you can’t clear the whole balance — interest has no cap and no relief valve.

The Steeper Penalty for Fraudulent Nonfiling

If the IRS finds that you failed to file with intent to evade tax, the rate triples to 15% per month and the cap rises to 75% of the unpaid tax.² The 75% ceiling is reached after five months, the same window, just at a much steeper slope. This civil penalty is separate from criminal prosecution; the IRS can assess it and still refer the case for charges. Fraud findings are uncommon because the agency has to establish intent rather than negligence.

Getting the Penalty Reduced or Removed

The statute itself waives the penalty when the late filing was due to reasonable cause and not willful neglect.² The IRS decides case by case, asking whether you used ordinary care and were still unable to file on time.⁵

Circumstances the IRS treats as reasonable cause include:

Natural disasters or fires that destroyed records or blocked access to a preparer
Serious illness or death of the taxpayer or an immediate family member
Inability to obtain records needed to complete the return
System issues that disrupted a timely electronic filing

What generally doesn’t qualify: not knowing about the deadline, making a mistake, or not having the money to pay. The IRS treats those as the taxpayer’s own responsibility.⁵

First-Time Abatement

Even without a dramatic excuse, you may qualify for an administrative waiver called First-Time Abate. It applies if you filed all required returns for the three prior tax years and had no penalties during that period, or any prior penalties were removed for a reason other than First-Time Abate.⁶

The fastest way to request it is to call the number on your IRS notice. The agent will check your compliance history on the spot; you don’t need to file paperwork or name the program. If you’d rather put it in writing, mail Form 843 or a signed statement to the address on the notice.⁶

Requesting a Refund If You Already Paid

If you paid the penalty and later realize you qualified for relief, you can ask for it back on Form 843. File a separate form for each tax year, explain why relief is warranted, and attach supporting documentation. The deadline is three years from the date you filed the return or two years from the date you paid the penalty, whichever is later.⁷

A Note on Partnerships and S Corporations

The 5% rate covers individual income tax. Partnerships and S corporations follow a different structure entirely: a flat $255 per partner or shareholder for each month the return is late, up to 12 months, for returns due after December 31, 2025.¹⁸⁹ Because the charge is per-owner and not tied to tax owed, a pass-through entity with no tax liability can still owe a substantial penalty for filing late.

1
Internal Revenue Service. Failure to File Penalty
2
Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
3
Internal Revenue Service. Failure to Pay Penalty
4
Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
5
Internal Revenue Service. Penalty Relief for Reasonable Cause
6
Internal Revenue Service. Administrative Penalty Relief
7
Internal Revenue Service. Instructions for Form 843 – Claim for Refund and Request for Abatement
8
Office of the Law Revision Counsel. 26 USC 6698 – Failure to File Partnership Return
9
Office of the Law Revision Counsel. 26 USC 6699 – Failure to File S Corporation Return