IRS Failure-to-File and Failure-to-Pay Penalties, Explained

The IRS charges two separate penalties on unpaid tax: the failure-to-file penalty is 5% of unpaid tax per month (capped at 25%), while the failure-to-pay penalty is 0.5% per month (also capped at 25%). Not filing costs ten times more than not paying — so file your return even if you can’t pay the balance.

Tax Debt Compass is an independent educational guide. We are not the IRS, not a tax firm, and we do not negotiate with the IRS or prepare returns — we explain how the system works in plain English.

Key takeaways

Failure to file: 5% per month, max 25%. This applies for each month or part of a month your return is late.
Failure to pay: 0.5% per month, max 25%. This applies to the unpaid balance, starting from the payment deadline.
File even if you can’t pay. The 10-to-1 difference means a late return is far more expensive than an unpaid balance.
If both apply in one month, the combined rate is 5%. The failure-to-file portion drops to 4.5% so the total doesn’t exceed 5% — still capped at 25% combined.
Penalties can be reduced or removed. Through first-time abatement or reasonable cause, qualifying taxpayers can get penalties wiped — which is why knowing they exist matters.

The two penalties, side by side

	Failure to file	Failure to pay
Rate	5% of unpaid tax per month (or part of a month)	0.5% of unpaid tax per month (or part of a month)
Cap	25% of the unpaid tax	25% of the unpaid tax
Starts	After the filing deadline passes without a return or extension	After the payment deadline passes with a balance unpaid
Ends	When you file (or hit the 25% cap)	When you pay in full (or hit the 25% cap)

Both penalties are calculated on the unpaid tax — the amount of tax shown on your return (or determined to be due) minus what you already paid through withholding or estimated payments. If you owe nothing, neither penalty applies. If you filed on time but owe a balance, only the failure-to-pay penalty applies.

The failure-to-file penalty in detail

The failure-to-file penalty accrues at 5% of the unpaid tax for each month or part of a month the return is late, up to a maximum of 25%. It reaches that cap after five months. Note the “part of a month” phrasing: one day late counts as a full month, which is why the penalty jumps so fast at the start.

A few details that matter:

An extension to file is not an extension to pay. If you filed Form 4868 and filed by the extended deadline, no failure-to-file penalty applies. But the failure-to-pay penalty still accrues on any unpaid balance from the original payment deadline.
The minimum penalty. If your return is more than 60 days late, a minimum failure-to-file penalty applies — the lesser of a set dollar amount (adjusted periodically for inflation; check the current figure on irs.gov) or 100% of the unpaid tax. This floor can make the penalty surprisingly large on small balances.
Fraudulent failure to file carries a higher rate (15% per month, max 75%), but that requires the IRS to prove fraud — it’s not the standard case.

The failure-to-pay penalty in detail

The failure-to-pay penalty accrues at 0.5% of the unpaid tax per month or part of a month, up to 25% — which takes 50 months to reach at the base rate. It applies whenever tax shown on your return isn’t paid by the due date, even if you filed on time.

This penalty keeps accruing month after month until the balance is paid or the cap is hit. On top of it, interest compounds daily on the whole balance, including on the penalties themselves. The debt grows from two directions at once, which is why an old balance can look so much bigger than the original tax.

When both penalties apply in the same month

If you neither filed nor paid, both penalties run at the same time — but the IRS doesn’t stack them at 5.5%. For any month when both apply, the failure-to-file penalty is reduced from 5% to 4.5%, so the combined rate is 5% per month. The combined penalties are still capped at 25% total.

This combined 5% hits the 25% cap after five months, same as the failure-to-file penalty alone. After the failure-to-file penalty maxes out at 25%, the failure-to-pay penalty continues on its own at 0.5% per month until it too reaches its cap. In practice, someone who neither files nor pays for a long time ends up at the full 25% + 25% = 50% in penalties on the unpaid tax — plus interest.

Special cases: the 1% increase and the 0.25% reduction

Two adjustments change the failure-to-pay rate in specific situations:

It rises to 1% per month if the IRS has issued a notice of intent to levy (such as an LT11 or Letter 1058) or a notice and demand for immediate payment, and the tax remains unpaid 10 days after that notice. This is the IRS turning up the financial pressure alongside its collection pressure.
It drops to 0.25% per month while an installment agreement is in effect. Entering a payment plan literally halves the ongoing penalty rate — one of the concrete financial reasons a formal agreement beats informal partial payments.

An illustrative worked example

The example below uses round numbers and simplified math to show the asymmetry. It is illustrative only — it doesn’t include interest, the 60-day minimum, or the special-case rate changes, and your actual penalty depends on your specific facts.

Assume $10,000 of tax unpaid, with the return filed 5 months late:

Failure to file: 5% × $10,000 = $500 per month × 5 months = $2,500 (hits the 25% cap).
Failure to pay (same 5 months, combined rule): 0.5% × $10,000 = $50 per month × 5 months = $250.
Combined after 5 months: $2,500 + $250 = $2,750 in penalties.

Now compare: if the return had been filed on time with the same $10,000 unpaid, only the failure-to-pay penalty would apply — $50 per month. After 5 months that’s $250 instead of $2,750. The return itself, even with zero dollars attached, is worth $2,500 in avoided penalties in this illustration. That is the whole message of this article in one number.

What penalties attach to

A common point of confusion: these penalties apply to unpaid tax shown on a return (or later determined to be due). They don’t apply to amounts you already paid through withholding or estimated payments. A few clarifications:

If you’re due a refund, there’s no failure-to-file penalty — but there’s also no reason to delay, since you’re leaving your own money on the table (and refunds expire after three years).
The penalties are calculated on the net unpaid tax — total tax minus timely payments.
Interest accrues on penalties too. The daily-compounding interest charge applies to the total balance, penalties included, which is one more reason penalties matter beyond their face amount.

If the penalty amounts on your account look wrong, or you believe you had a valid reason for filing or paying late, read our guide to penalty abatement — first-time abatement and reasonable cause exist precisely for these situations.

Frequently asked questions

I can’t pay my tax bill. Should I still file my return?
Yes — this is the single most valuable action in this guide. Filing stops the 5%-per-month failure-to-file penalty. The 0.5%-per-month failure-to-pay penalty will still accrue on the unpaid balance, but that’s one-tenth the rate. Filing with no payment is always cheaper than not filing.

Does a filing extension stop the penalties?
A timely extension (Form 4868) stops the failure-to-file penalty if you file by the extended date. It does not stop the failure-to-pay penalty or interest — those run from the original payment deadline regardless of the extension.

What if I owe nothing — can I still be penalized for filing late?
If your return shows no tax due (or a refund), there’s no unpaid tax for the percentage penalties to apply to. You’re not penalized for filing late in that case — though if you’re owed a refund, you must claim it within three years of the filing deadline.

Do the penalties stop once I set up a payment plan?
The failure-to-pay penalty rate drops from 0.5% to 0.25% per month while an installment agreement is in effect. It doesn’t disappear, and interest keeps compounding — but the agreement cuts the ongoing penalty rate in half and generally pauses active collection.

Can these penalties be removed after they’re charged?
Sometimes. First-time penalty abatement is available to taxpayers with a clean compliance history, and reasonable-cause relief covers situations like serious illness or natural disaster. Abatement is considered case by case — never assured — and it’s requested after the penalties are assessed. Our penalty abatement guide covers both paths in detail.

Your concrete next step

Pull up your IRS online account or your most recent notice and check two dates for each tax year you owe on: the date the return was filed (or whether it was filed at all) and the payment deadline. If any return is still unfiled, that year’s 5%-per-month penalty may still be running — which makes filing that return the highest-value paperwork you can do this week. Our guide for people who haven’t filed in years walks through getting back into the system without panic. For the full case on why the return matters more than the payment, our guide to filing your return even if you can’t pay breaks down the math behind the 5%-versus-0.5% asymmetry.

Tax Debt Compass publishes general educational information about IRS tax debt. Nothing here is tax, legal, or financial advice for your situation. We are not the IRS, not a tax firm, and we do not negotiate with the IRS or prepare returns. Consult a licensed CPA, tax attorney, or enrolled agent about your specific situation.