Failure-to-File Penalty

The failure-to-file penalty is what the IRS charges when a tax return is not filed by its due date, including any extension you obtained. It is the heaviest of the everyday late penalties because it builds faster than the penalty for paying late. This page explains how the failure-to-file penalty is calculated for 2025 returns (due in 2026), how it overlaps with the failure-to-pay penalty, and what options exist if you already have a bill.

What triggers the penalty

The penalty applies when a required return is filed after its due date and tax is still owed. For most individuals with a calendar tax year, the 2025 Form 1040 was due April 15, 2026. An extension of time to file moves the filing deadline, generally to October 15 for individuals, but it does not move the payment deadline. If you miss the extended date, the penalty runs from there.

The same section covers many business returns, such as Form 1120. Partnerships and S corporations are treated differently; see our page on the S corporation and partnership late-filing penalty.

How the penalty is calculated

The base amount is the tax due on the return, reduced by tax you paid on time and by refundable credits you are allowed. Each month or part of a month the return is late adds 5% of that base, up to five months (25%). A return that is one day late and one that is 29 days late both count as one full month.

Example (hypothetical). Your 2025 return shows $10,000 of tax still owed after withholding and credits. You pay nothing by April 15, 2026. You then file and pay on the dates below.

The failure-to-file column stops growing after five months because it hits its cap. The failure-to-pay column keeps growing by 0.5% a month until the tax is paid or that penalty reaches its own 25% limit. Interest is charged on top of both. Added together over a long period, the two penalties can reach 47.5% of the unpaid tax (22.5% plus 25%), not counting interest.

The minimum penalty for very late returns

If a Form 1040 or 1120 is more than 60 days late, the IRS applies a minimum. The minimum is the amount below or 100% of the tax owed, whichever is less. The dollar figure is adjusted over time and depends on the return's original due date, not the extended date:

• Returns due in 2026 (tax year 2025): $525
• Returns due in 2025: $510
• Returns due in 2024: $485

So if you owe $300 on a 2025 return and file it 90 days late, the penalty is capped at the tax owed, $300. If you owe $8,000, the regular calculation for a return more than 60 days late already exceeds $525, so the minimum does not change the result.

When the penalty is much higher

If the IRS determines that a failure to file was fraudulent, the monthly rate is three times the usual rate and the cap is three times as well: 15% a month, up to 75% (section 6651(f)). Fraud means intent, not forgetfulness or disorganization. See our page on the civil fraud penalty.

Failure to file versus failure to pay

The two penalties are separate. When both apply in the same month, the IRS reduces the failure-to-file amount by the failure-to-pay amount, which is how 5% becomes 4.5% plus 0.5%. Filing on time even if you cannot pay is therefore much cheaper than not filing. The failure-to-pay penalty page covers the second half of the picture.

How to avoid it

• File by the due date, even if you cannot pay. A filed return stops the larger penalty and lets you set up a payment plan.
• Request an extension of time to file before the deadline. Pay what you can with it, since interest and the payment penalty still run.
• If you cannot pay in full, ask about an installment agreement. It can reduce future penalties.
• If you have unfiled prior years, start with our page on unfiled tax returns.

Asking for relief

The IRS says it may remove or reduce penalties when you acted in good faith and had reasonable cause. Reasons the IRS lists include fire, natural disaster, being unable to get records, and death, serious illness or unavoidable absence of you or an immediate family member. Relying on a tax professional, not knowing about the requirement, or a shortage of funds is generally not enough by itself, although other facts can matter.

If you have a clean history, ask about first-time penalty abatement. For 2025 returns and later, the IRS has also described an automatic exemption for taxpayers with a clean three-year record, which is explained on that page. Start by calling the number on your notice. If the request cannot be handled by phone, a written request or Form 843 is the usual next step. Our guide on how to request penalty abatement walks through it. Interest on a penalty is removed automatically if the penalty itself is removed.

How we can help

We can review a failure-to-file notice, check whether the amount is calculated correctly, and tell you whether a first-time or reasonable-cause request fits your facts. If returns are missing for several years, we can help prepare them in order. We cannot promise the IRS will remove a penalty, but a well-documented request is the way to give it a fair chance.

Related help includes our individual tax preparation and IRS representation services, or you can contact us.

Frequently asked questions

General information only, not tax, legal or accounting advice for your situation. Rules, limits and deadlines change; confirm the current rules with the official source or a qualified professional before you act. Reading this page does not create a professional relationship with CPA Tax Payroll and Accounting Corp.