What Is a Tax Penalty? IRS Types, Interest, and Relief Options

An IRS tax penalty is a charge added to your account when you file late, pay late, underreport income, or miss estimated payments. The most common ones are the failure to file penalty at 5% of unpaid tax per month, the failure to pay penalty at 0.5% per month, and the accuracy-related penalty at a flat 20% of the underpaid amount. Interest runs on top of everything and compounds daily. Many of these penalties can be reduced or removed if you have a clean prior record or a legitimate reason for the lapse.

Failure to File

This is the biggest one, and the one people underestimate. If you don’t submit your return by the deadline, the IRS charges 5% of the unpaid tax for each month or partial month the return is late, up to a 25% cap.¹ The cap is reached after five months.

File more than 60 days late and a minimum penalty applies regardless of what you owe. For returns due after December 31, 2025, that minimum is $525 or 100% of the tax owed, whichever is less.²

An extension avoids this penalty, but only if you file the extension request by the original due date. The extension buys you time to file the paperwork, not time to pay.³ If you owe tax, that amount is still due on the original deadline.

Failure to Pay

If you filed on time but didn’t pay the tax you owed, the IRS charges 0.5% of the unpaid balance per month, also capped at 25%.¹ The rate is one-tenth the failure to file penalty, but it grinds on until you clear the balance.

Filed on time and set up an installment agreement? The monthly rate drops to 0.25% while the plan is active.⁴ Both conditions have to hold, timely filing and an approved plan.

When Both Apply

If you file late and pay late in the same month, the IRS caps the combined monthly hit at 5%. In practice that means 4.5% for filing late plus 0.5% for paying late.² The filing penalty stops at five months and 25%. The payment penalty keeps going until it either gets paid off or hits its own 25% ceiling.⁴ A taxpayer who never files and never pays can end up owing 47.5% in penalties on top of the original tax, plus daily interest.

Accuracy-Related Penalty

You can file on time, pay on time, and still get hit with a penalty if your return was wrong. The accuracy-related penalty is 20% of the portion of tax that was underpaid due to negligence or a substantial understatement.⁵ It applies only to the underpaid amount tied to the error, not the whole return.

Negligence means you didn’t make a reasonable effort to follow the rules or keep records. A substantial understatement, for individuals, means the correct tax exceeds what you reported by either 10% of the correct tax or $5,000, whichever is larger.⁵ So on a correct tax of $40,000, understating by $4,000 triggers it; on a correct tax of $30,000, the trigger is $5,000 because 10% is only $3,000.

Estimated Tax Underpayment

If you have income that isn’t withheld from a paycheck, such as self-employment, rental, or investment income, you’re expected to pay tax quarterly. Underpay, and the IRS charges a penalty computed with the quarterly interest rate against the shortfall for each period you missed.⁶

You avoid the penalty by meeting any one of three safe harbors:

Your total unpaid balance for the year is under $1,000 after withholding and credits.
Your withholding and estimated payments covered at least 90% of the current year’s tax.
You paid at least 100% of last year’s total tax, or 110% if your prior-year adjusted gross income was over $150,000 ($75,000 if married filing separately).⁷

The 110% threshold trips up higher earners. If you had a strong income year and just matched last year’s payments, you may still owe a penalty because 100% wasn’t enough for you.

Civil Fraud

The civil fraud penalty is the harshest sanction the IRS can impose short of criminal charges. It runs 75% of the portion of the underpayment attributable to fraud.⁸ On a $50,000 fraudulent underpayment, that’s $37,500 on top of the tax.

Two rules cushion taxpayers. The IRS has to prove fraud by clear and convincing evidence, a much higher standard than the ordinary audit burden.⁹ But once any part of the underpayment is proven fraudulent, the entire underpayment is presumed to be fraud, and it’s on you to rebut that presumption item by item.⁸ Civil fraud and the 20% accuracy penalty can’t both apply to the same underpayment.

Information Return Penalties for Businesses

If you issue Forms 1099, W-2, or similar documents, filing them late, wrong, or not at all carries its own tiered penalty per form. For returns due in 2026:¹⁰

Filed within 30 days of the deadline: $60 per return.
Filed after 30 days but by August 1: $130 per return.
Filed after August 1 or not at all: $340 per return.
Intentional disregard: $680 per return, with no annual cap.

Annual maximums apply at each tier below intentional disregard, and they’re lower for small businesses with average gross receipts of $5 million or less. A small business tops out at $239,000 at the 30-day tier, while larger businesses can be assessed up to $683,000 at the same tier.¹⁰ The same tiers apply separately to failures to furnish correct payee statements to the recipient.¹¹

Interest Is Separate

Interest isn’t a penalty. It’s the time cost of money owed but not paid. The IRS resets its rate every quarter at the federal short-term rate plus three points, and it compounds daily on any unpaid balance, including on the unpaid penalties themselves.¹² The underpayment rate is 7% for January through March 2026 and 6% for April through June 2026.¹³ Interest is rarely abated even when a penalty is removed; it goes only when an IRS employee’s unreasonable delay caused it.

How to Get a Penalty Reduced or Removed

An assessed penalty is not a final answer. Two paths handle most requests.

First Time Abate

This administrative waiver is designed for taxpayers who normally comply and slipped once. It covers three penalties: failure to file, failure to pay, and failure to deposit (a payroll penalty for employers).¹⁴

You qualify if all of these are true:

You filed the same type of return for the three tax years before the penalty year.
You had no penalties in those three prior years, or any prior penalty was removed for a reason other than First Time Abate.
You’ve filed all currently required returns and paid or arranged to pay any tax due.¹⁴

You can request First Time Abate by phone. If the representative can verify your compliance history on the call, the penalty often comes off during the same conversation. Larger or more complex requests may need Form 843 in writing.¹⁵

Reasonable Cause

Reasonable cause relief is for taxpayers who exercised ordinary care and prudence but still couldn’t file or pay on time because of circumstances they couldn’t control.¹⁶ Situations that commonly qualify include serious illness or a death in the immediate family, a natural disaster that destroyed records, and an inability to obtain necessary documents despite reasonable effort. Good-faith reliance on incorrect written advice from the IRS itself is also grounds for abatement.¹⁵

Be specific in your written request. “I was in the hospital” is weaker than a letter with the dates, medical documentation, and evidence that you filed or paid as soon as you were able. The IRS wants to see both what stopped you and what you did once the obstacle was gone.

Appealing a Denial

If the IRS denies your relief request, you generally have 30 days from the date of the denial letter to file an appeal.¹⁷ Send the denial letter, an explanation of why the penalty should come off, and supporting documents such as proof of timely filing, cancelled checks, or evidence of the circumstances that prevented compliance.

If a federal tax lien notice or an intent to levy notice shows up while penalties remain unpaid, you can request a Collection Due Process hearing within 30 days. At that hearing you can raise collection alternatives like an installment agreement or offer in compromise, though your ability to challenge the underlying tax is limited if you had a prior opportunity to dispute it.¹⁸ You can petition the U.S. Tax Court if you disagree with the hearing’s outcome.

1
Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
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Internal Revenue Service. Failure to File Penalty
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Internal Revenue Service. Get an Extension to File Your Tax Return
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Internal Revenue Service. Failure to Pay Penalty
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Internal Revenue Service. Accuracy-Related Penalty
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Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
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Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
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Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty
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United States Tax Court. Rule 142 – Burden of Proof
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Internal Revenue Service. Internal Revenue Manual 20.1.7 – Information Return Penalties
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Internal Revenue Service. Information Return Penalties
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Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
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Internal Revenue Service. Quarterly Interest Rates
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Internal Revenue Service. Administrative Penalty Relief
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Internal Revenue Service. Instructions for Form 843 – Claim for Refund and Request for Abatement
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Internal Revenue Service. Penalty Relief for Reasonable Cause
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Internal Revenue Service. Penalty Appeal
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Internal Revenue Service. Collection Due Process (CDP) FAQs