IRS Tax Penalties: Types, Interest, and Relief Requests

IRS tax penalties fall into a handful of categories: filing late, paying late, underpaying estimated tax during the year, filing an inaccurate return, and — at the far end — civil fraud. Charges run from a fraction of a percent per month to 75 percent of the underpayment, and most can be reduced or removed through First Time Abate, reasonable cause relief, or an appeal.

Failure to File Penalty

Missing the filing deadline triggers the steepest of the common penalties: 5 percent of your unpaid tax for each month or partial month the return is late, capped at 25 percent.¹ The clock starts the day after the deadline, so a single day late costs a full month of penalty.

If the return is more than 60 days late, a floor kicks in. For returns due after December 31, 2025, the minimum is the lesser of $525 or 100 percent of the tax owed.² Owe $200, the minimum is $200. Owe $5,000, the minimum is $525. That floor is why the standard advice holds even when money is tight: file on time, then deal with the balance.

Failure to Pay Penalty

When the return is filed but the balance isn’t paid, the IRS adds 0.5 percent of the unpaid amount for each month it stays outstanding, capped at 25 percent.¹ When both the filing and payment penalties apply in the same month, the filing penalty is reduced by the payment penalty, so the combined rate is 5 percent for that month rather than 5.5 percent.

Setting up an installment agreement cuts the rate in half. If you filed on time and have an active IRS payment plan, the failure-to-pay rate drops from 0.5 percent to 0.25 percent per month for the life of the agreement.³ The setup runs through IRS.gov.

An Extension Does Not Extend the Payment Deadline

A filing extension buys six extra months to submit the paperwork. It does not buy extra time to pay. Interest and the failure-to-pay penalty accrue from the original due date on any balance not sent in.⁴ If you need the extension to gather documents, estimate the liability as closely as you can and pay that amount with the extension request.

Estimated Tax Penalty

Income that isn’t subject to withholding — self-employment earnings, investment returns, rental income — is expected to be paid in through quarterly estimated tax. Fall short, and the IRS charges the current underpayment interest rate on the amount you underpaid each quarter, running from each installment due date until you pay or file.⁵ For the first quarter of 2026, that rate is 7 percent per year.⁶

You avoid the penalty entirely if you meet any of these safe harbors:⁷

You owe less than $1,000 after withholding and credits.
Your payments covered at least 90 percent of the tax on this year’s return.
Your payments equaled at least 100 percent of the tax on last year’s return. If prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the threshold rises to 110 percent.

The prior-year safe harbor is the one most self-employed taxpayers rely on, because the number is known before the year begins. If income is climbing quickly, watch the 110 percent rule; it catches higher earners who assume last year’s payments will still cover them.

Accuracy-Related Penalty

Significant errors on a return can bring a flat 20 percent penalty on the portion of the underpayment caused by the mistake.⁸ It applies to underpayments caused by negligence, disregard of IRS rules, a substantial understatement of income tax, or a substantial misstatement of property values.

A “substantial understatement” generally means reported tax was off by more than the greater of 10 percent of the correct tax or $5,000. This penalty targets the quality of the return rather than the timing. You can defend against it by showing reasonable cause: that you acted in good faith and had a legitimate basis for the position taken.⁹

Civil Fraud Penalty

When an underpayment involves deliberate deception rather than a careless mistake, the penalty jumps to 75 percent of the underpayment attributable to fraud.¹⁰ The IRS must prove fraud by clear and convincing evidence, a higher legal bar than the standard for accuracy penalties.¹¹

Once the IRS establishes that any portion of an underpayment was fraudulent, the entire underpayment is presumed to be fraud unless you prove otherwise. On a joint return, the penalty applies only to the spouse whose conduct was fraudulent.¹⁰ Indicators the agency looks for include omitting entire income sources, claiming fictitious deductions, keeping two sets of books, destroying records, and consistently underreporting income across multiple years.¹¹

Information Return Penalties and Bounced Payments

Businesses and other filers required to submit information returns like W-2s and 1099s face separate per-return penalties when those forms are late, wrong, or missing. For returns due in 2026, the amounts scale with lateness:¹²

Up to 30 days late: $60 per return.
31 days late through August 1: $130 per return.
After August 1, or never filed: $340 per return.
Intentional disregard: $680 per return, with no maximum cap.

These add up quickly for employers and financial institutions issuing hundreds or thousands of forms. The intentional disregard tier applies to filers who knowingly ignore the requirement, and it has no ceiling.

The IRS also charges a penalty when a check or electronic payment fails to clear: 2 percent of the payment amount, with a minimum of $25 for payments under $1,250.¹³ It doesn’t apply if you had a good-faith reason to believe the payment would clear.

Interest on Top of Penalties

Interest runs on unpaid tax from the original due date until the full balance is paid. The IRS compounds it daily and resets the rate every quarter based on the federal short-term rate plus 3 percentage points.¹⁴ For the first quarter of 2026, the individual underpayment rate is 7 percent per year.⁶

Interest also accrues on penalties themselves once they’re assessed. The IRS cannot waive interest unless the underlying penalty is removed or reduced, so getting a penalty abated is usually the only way to reduce the interest that came with it.⁹

First Time Abate

If your recent record is clean, First Time Abate is often the fastest way to get a penalty removed. This administrative waiver doesn’t require proving hardship. You qualify if you had no penalties in the three tax years before the penalty year and you’re current on all required filings (or have a valid extension in place).¹⁵

First Time Abate covers failure-to-file, failure-to-pay, and failure-to-deposit penalties. It doesn’t cover accuracy-related penalties, estimated tax penalties, or fraud. For a compliant taxpayer who hit one bad year, this is usually the first thing to check before building a more complex argument.

Reasonable Cause Relief

The broader form of relief requires showing that you exercised ordinary care but still couldn’t meet your tax obligations because of circumstances beyond your control. The IRS decides these case by case, weighing the reason given, your compliance history over the previous three years, how long the noncompliance lasted, and whether the triggering event was something you could have anticipated.¹⁶

Events the IRS recognizes include fires, natural disasters, serious illness or death in your immediate family, and system issues that prevented a timely electronic filing.¹⁷ The question isn’t just whether something bad happened, but whether a reasonably careful person in your situation would have been unable to comply. Hospital records, insurance claims, and similar documentation carry the argument.

How to Request Relief

For straightforward cases, especially First Time Abate, call the toll-free number on your penalty notice and ask for relief over the phone. Have the notice, the specific penalty, and your reasons ready. The representative can approve or deny the request on the call.¹⁸

If the phone request fails, or your case involves reasonable cause with supporting documents, submit a written request on Form 843, Claim for Refund and Request for Abatement.¹⁵ Mail the completed form to the IRS service center listed in the form’s instructions; the address depends on where you live. Use certified mail with a return receipt so you have proof of the submission date.

On Form 843, identify the tax period, type of tax, and specific penalty you’re contesting, and include a written explanation of why the penalty should be removed. For reasonable cause claims, attach the evidence: medical records, insurance documentation, correspondence showing system failures, or anything else that shows you couldn’t comply despite exercising reasonable care.

Appealing a Denied Request

A denial isn’t the end. You generally have 30 days from the date of the rejection letter to request an appeal with the IRS Independent Office of Appeals.¹⁹ Check the letter for your exact deadline, which can vary.

If the total penalty and additional tax for each period is $25,000 or less, you can file a Small Case Request using Form 12203. List the items you disagree with and explain why. For amounts above $25,000, submit a formal written protest.²⁰ Mail the protest to the IRS address shown in the denial letter, not directly to the Office of Appeals, which can delay the process.

Appeals officers have broad settlement authority and can look at a case fresh. If you have new documentation or a stronger argument than what went in the first time, this is where it can move the outcome.

1
Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
2
Internal Revenue Service. Failure to File Penalty
3
Internal Revenue Service. Failure to Pay Penalty
4
Internal Revenue Service. Topic No. 304, Extensions of Time to File Your Tax Return
5
Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
6
Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
7
Internal Revenue Service. Publication 505 (2026), Tax Withholding and Estimated Tax
8
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
9
Internal Revenue Service. Accuracy-Related Penalty
10
Office of the Law Revision Counsel. 26 US Code 6663 – Imposition of Fraud Penalty
11
Internal Revenue Service. IRM 20.1.5 Return Related Penalties
12
Internal Revenue Service. Information Return Penalties
13
Office of the Law Revision Counsel. 26 US Code 6657 – Bad Checks
14
Internal Revenue Service. Quarterly Interest Rates
15
Internal Revenue Service. Administrative Penalty Relief
16
Internal Revenue Service. IRM 20.1.1 Introduction and Penalty Relief
17
Internal Revenue Service. Penalty Relief for Reasonable Cause
18
Internal Revenue Service. Penalty Relief
19
Internal Revenue Service. Penalty Appeal
20
Internal Revenue Service. Preparing a Request for Appeals