What Is the IRS Late Payment Penalty and How It’s Calculated?

The IRS late payment penalty is 0.5% of your unpaid tax for each month or partial month the balance sits unpaid, up to a combined maximum of 25%. Interest compounds daily on top of that, running at 7% per year for 2026 with no cap. The clock starts the day after the tax deadline, and filing an extension does not buy you more time to pay — it only extends the paperwork deadline.¹

How the 0.5% Monthly Charge Is Calculated

The penalty runs at 0.5% of your unpaid tax per month, and partial months count as full ones. Pay one day late and you owe the same 0.5% as someone who waited 29 days.² The charge applies to the net amount you still owe after subtracting withholding, estimated payments, and refundable credits, not to your total tax liability before those adjustments.

Making a partial payment during a month does not reduce that month’s penalty. You still get charged the full 0.5% for the month you’re in. The base amount does drop for the following month, though, because the penalty is recalculated against the remaining balance at the start of each new month.³ Sending something in — even a small amount — lowers your charges going forward.

Filing an extension to October does not change your payment deadline. Taxes are still due April 15 (or the next business day if that falls on a weekend or holiday), and the penalty starts the day after.¹

When the Rate Drops to 0.25% or Rises to 1%

The standard 0.5% isn’t fixed. It moves in two directions, and which one applies depends on what you do next.

Installment Agreement Cuts the Rate in Half

If you set up a formal payment plan with the IRS and filed your return on time, the monthly penalty drops to 0.25%. The lower rate stays in place as long as you keep making your scheduled payments.² Over a multi-year payoff, that gap adds up. On a $10,000 balance, you’d save $25 per month in penalty charges compared to the standard rate.

Ignoring a Levy Notice Doubles It

If you ignore IRS collection notices, the penalty jumps to 1% per month. This kicks in 10 days after the IRS sends a formal notice of intent to levy, which is the legal step before seizing wages, bank accounts, or other assets.² At 1% per month, the penalty hits its 25% ceiling in just over two years instead of the four-plus years it would take at 0.5%.

The 25% Cap and What It Doesn’t Cover

The failure-to-pay penalty stops accumulating once it reaches 25% of the original unpaid tax. A $5,000 balance caps at $1,250. Once you hit that ceiling, no additional monthly penalty accrues for that tax year.²

The cap only applies to the penalty itself. Interest keeps running with no maximum, and the IRS charges interest on assessed penalties as well as on the underlying tax.⁴ Even after the penalty stops growing, your total debt can keep climbing.

How Interest Compounds on Top

The IRS sets its interest rate every quarter using the federal short-term rate plus three percentage points. For 2026, the rate for individual underpayments is 7% per year, compounded daily.⁵ Daily compounding means each day’s interest is calculated on the previous day’s total, including all prior interest. On a $10,000 debt, that’s roughly $1.92 per day at the start, accelerating as interest folds back in.

Unlike the penalty, interest has no ceiling. It runs from the original due date until the balance is paid in full, even if you’re on a payment plan.⁴ Over several years, interest regularly grows to become the largest component of a tax debt.⁶

IRS penalties and interest on personal income tax are not deductible on your federal return. The IRS classifies them as nondeductible personal interest, so there’s no tax benefit to offset the cost.

If You Filed Late Too

Missing both the filing deadline and the payment deadline triggers two separate penalties: the failure-to-file penalty at 5% per month (capping at 25%) and the failure-to-pay penalty at 0.5% per month (capping at 25%). For any month both apply, the IRS reduces the filing penalty by the payment penalty amount.²

So the combined charge is 5% per month for the first five months (4.5% filing plus 0.5% payment). After five months, the filing penalty maxes out at 22.5%. The payment penalty keeps running at 0.5% per month until it reaches its own 25% cap. The worst-case combined penalty for someone who never files and never pays is 47.5% of the original balance, plus interest on all of it.

The filing penalty is ten times larger than the payment penalty. If you can only do one thing, file the return on time even if you can’t pay.

Minimum Penalty for Returns Over 60 Days Late

If your return is more than 60 days late, the IRS imposes a minimum failure-to-file penalty. For returns due in 2026, that minimum is $525 or 100% of the tax you owe, whichever is less.⁷ Someone who owes $200 would owe the full $200 as a penalty; someone owing $3,000 would owe at least $525.

Estimated Tax Underpayments Follow Different Rules

If your income isn’t subject to withholding — from self-employment, investments, or rental property — you’re expected to pay estimated taxes quarterly. Falling short triggers a separate penalty calculated under different rules than the failure-to-pay penalty covered above.⁸ It applies the underpayment interest rate (currently 7%) to each missed installment for the period between when it was due and when you paid or filed. It functions more like an interest charge on each late installment than a flat monthly percentage.

You avoid the estimated tax penalty by meeting one of two safe harbors: pay at least 90% of your current-year tax through withholding and estimated payments, or pay at least 100% of the tax shown on your prior-year return. If your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the prior-year safe harbor rises to 110%.⁹

Getting the Penalty Reduced or Removed

The IRS does remove penalties in certain circumstances, and many taxpayers who qualify never ask.

First Time Abate

The simplest option is the First Time Abate waiver, which removes the failure-to-pay penalty (and the failure-to-file penalty, if applicable) for taxpayers with a clean three-year record. To qualify, you must have filed all required returns for the three years before the penalty year, had no penalties assessed during those three years (excluding estimated tax penalties), and filed the current return on time.¹⁰

Request it by calling the toll-free number on your IRS notice. You don’t need specific terminology or documentation; the representative will review your account to see if you qualify.¹¹ If the penalty has already been paid, the IRS will issue a refund or credit.

Reasonable Cause

If you don’t qualify for First Time Abate, you can request penalty relief by showing reasonable cause. The IRS evaluates these case by case, looking at whether you exercised ordinary care but were still unable to pay on time. Circumstances that typically qualify include serious illness, natural disasters, inability to obtain records, and death or incapacitation of an immediate family member.¹²

“I didn’t have the money” generally does not qualify on its own. Documented financial hardship combined with specific circumstances, like job loss followed by a medical emergency, can succeed. Hospital records, insurance claims, court documents, or official disaster declarations all strengthen the request. You can submit a reasonable cause argument by calling the IRS, writing a letter in response to a penalty notice, or filing Form 843.¹³ The claim must generally be filed within three years of the return’s filing date or two years of paying the tax, whichever is later.

Options When You Can’t Pay in Full

Ignoring the debt is the most expensive path. Interest and penalties accumulate, and the IRS eventually escalates to liens and levies. Setting up an arrangement stops the escalation and, in many cases, reduces the ongoing penalty rate.

Short-Term Payment Plan

If you can pay within 180 days, the IRS offers a short-term plan with no setup fee. You still owe interest and penalties each month until the balance is gone, but nothing extra to arrange the plan. This works for balances under $100,000 in combined tax, penalties, and interest.¹⁴

Long-Term Installment Agreement

For balances up to $50,000, you can apply online for a monthly installment agreement. Setup fees range from $22 (online, direct debit) to $178 (phone or mail, non-direct-debit), with fee waivers for low-income taxpayers.¹⁴ As long as you filed your return on time, entering the agreement drops your monthly failure-to-pay penalty from 0.5% to 0.25%.² Interest continues to accrue, but the penalty reduction and the protection from enforced collection make this the right move for most people who need time.

Offer in Compromise and Hardship Status

If your tax debt is genuinely more than you could pay over a reasonable period, the IRS may accept a lump sum less than the full amount through an offer in compromise. The application requires a $205 fee plus an initial payment, both waivable for low-income applicants, and you must be current on all required filings.¹⁵ Acceptance rates are low.

If paying anything would prevent you from covering basic living expenses, you can request Currently Not Collectible status. The IRS suspends levies and garnishments while you’re in this status, but interest and penalties keep accruing on the balance the entire time.¹⁶ It’s a pause on enforcement, not a solution to the debt.

1
Internal Revenue Service. IRS – Need More Time to File, Request an Extension
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
5
Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026
6
Internal Revenue Service. Quarterly Interest Rates
7
Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
8
Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
9
Internal Revenue Service. Form 1040-ES – Estimated Tax for Individuals
10
Internal Revenue Service. 20.1.1 Introduction and Penalty Relief
11
Internal Revenue Service. Administrative Penalty Relief
12
Internal Revenue Service. Penalty Relief for Reasonable Cause
13
Internal Revenue Service. Instructions for Form 843 – Claim for Refund and Request for Abatement
14
Internal Revenue Service. Payment Plans – Installment Agreements
15
Internal Revenue Service. Offer in Compromise
16
Internal Revenue Service. 5.16.1 Currently Not Collectible