The penalty for paying taxes late is 0.5% of your unpaid federal tax for each month or partial month the balance sits unpaid, capped at 25% of what you owe.1Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax Interest runs on top of that, currently 7% for the first quarter of 2026, and it compounds daily until you pay in full.2Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 Relief is available if you have a clean recent filing record or a legitimate reason for the delay.
How the Late Payment Penalty Is Calculated
The failure-to-pay penalty accrues at 0.5% of your unpaid balance for every month or partial month it remains outstanding.1Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax A partial month counts as a full month, so paying on the second day of a new month costs the same as paying on the thirtieth. The penalty keeps growing until the total reaches 25% of your unpaid tax, which happens after roughly 50 months.
Two things change that rate. If the IRS issues a notice of intent to levy your property and you still haven’t paid within 10 days, the rate doubles to 1% per month.3Internal Revenue Service. Failure to Pay Penalty Going the other direction, if you filed your return on time and have an approved installment agreement in place, the rate drops to 0.25% per month.1Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
Interest on the Unpaid Balance
Separate from the penalty, interest accrues on any unpaid tax from the original due date until the day you pay.4Office of the Law Revision Counsel. 26 USC 6601 – Interest on Underpayment, Nonpayment, or Extensions of Time for Payment, of Tax The rate for individuals is the federal short-term rate plus 3 percentage points, reset every quarter.5Office of the Law Revision Counsel. 26 USC 6621 – Determination of Rate of Interest
For the first quarter of 2026 that rate is 7%. For April through June 2026 it drops to 6%.6Internal Revenue Service. Internal Revenue Bulletin 2026-08 Interest compounds daily, has no ceiling, and also attaches to any unpaid penalties. Even when the IRS removes a penalty, the interest portion is almost never waived.
What It Costs if You Also Filed Late
If you missed the filing deadline on top of missing the payment deadline, a second penalty applies: 5% of the unpaid tax for each month the return is late, up to 25%.1Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax The IRS does not just stack the two charges. For any month both apply, the failure-to-file penalty is reduced by the failure-to-pay penalty, so the combined monthly hit is 5%: 4.5% for the missing return and 0.5% for the missing payment.3Internal Revenue Service. Failure to Pay Penalty
After five months the filing penalty hits its 25% cap and stops. The payment penalty keeps running at 0.5% per month until it too reaches 25% or you pay the balance.7Internal Revenue Service. Failure to File Penalty The practical takeaway: file your return on time even when you can’t pay. The filing penalty is ten times the size of the payment penalty, and it accrues fast.
Returns more than 60 days late also trigger a minimum failure-to-file penalty. For returns due after December 31, 2025, that minimum is $525 or 100% of the unpaid tax, whichever is less.7Internal Revenue Service. Failure to File Penalty
An Extension to File Is Not an Extension to Pay
Filing Form 4868 gives you until October 15 to submit your return and shields you from the failure-to-file penalty during that window.8Internal Revenue Service. Taxpayers Who Need More Time to File a Federal Tax Return Should Request an Extension Your payment is still due in April.9Internal Revenue Service. 10Office of the Law Revision Counsel. 26 USC 6657 – Bad Checks It applies per failed attempt and sits on top of the penalties and interest already running on the underlying balance.
Getting the Penalty Reduced or Removed
The IRS can reduce or eliminate the failure-to-pay penalty under two main programs. Interest usually keeps running even when a penalty is removed.
First-Time Abate
If your recent compliance record is clean, you can request a First-Time Abate waiver. You qualify if you filed all required returns (or valid extensions) for the three tax years before the penalty year and received no penalties during that same three-year window.11Internal Revenue Service. Administrative Penalty Relief The fastest way to request it is to call the number on your IRS notice; many requests get approved on the call. You can also file Form 843 in writing.12Internal Revenue Service. Penalty Relief
Reasonable Cause
Even without a clean three-year record, the IRS can abate the penalty if you can show a legitimate reason you couldn’t pay on time. Circumstances the agency considers include:
- Fires, natural disasters, or civil disturbances
- Inability to obtain records needed to determine what you owed
- Death, serious illness, or unavoidable absence of you or an immediate family member
- System issues that interfered with an electronic payment13Internal Revenue Service. Penalty Relief for Reasonable Cause
Submit your request on Form 843 with a written explanation and documentation that ties the event to the specific period you missed. Hospital records, insurance claims, and FEMA disaster declarations are the kinds of proof the IRS looks for.14Internal Revenue Service. Instructions for Form 843 – Claim for Refund and Request for Abatement
Payment Plans Cut the Rate in Half
If you can’t pay the full balance, setting up an installment agreement doesn’t stop penalties and interest, but it does reduce the monthly penalty rate from 0.5% to 0.25% as long as you filed your return on time.1Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax It also keeps the IRS from levying your bank account or garnishing your wages while the plan is active.
Two options exist. A short-term plan gives you up to 180 days to pay in full and has no setup fee whether you apply online, by phone, or by mail. A long-term installment agreement with monthly payments carries a setup fee between $22 and $178, with the cheapest option being online enrollment with direct debit. Low-income taxpayers can qualify for a reduced fee or a waiver.15Internal Revenue Service. Payment Plans; Installment Agreements
How Long the IRS Can Keep Charging You
The IRS has 10 years from the date your tax is assessed to collect what you owe, including penalties and interest. This limit is called the Collection Statute Expiration Date.16Internal Revenue Service. Time IRS Can Collect Tax Once the window closes, the agency can no longer pursue the debt. Certain actions pause or extend that clock, including filing for bankruptcy or requesting an installment agreement. Over a decade of daily-compounding interest and accruing penalties, a modest unpaid balance can grow substantially.
State Penalties Apply Separately
Most states with an income tax run their own late-payment penalty and interest regimes on top of the federal charges. The structures differ by state, so if you missed a state deadline, check directly with your state tax agency.