A one percent monthly charge exists in the Internal Revenue Service’s failure-to-pay rules, but it does not attach to a taxpayer simply because a balance went unpaid. It switches on only after the agency sends a notice of its intent to levy and ten days pass without payment. Before that point the penalty runs at half the pace, and a late payer who settles or arranges a plan early never meets the higher tier.
Half a percent is the rate most late payers actually face
The IRS states the baseline plainly on its failure-to-pay penalty page: the penalty is 0.5 percent of the unpaid taxes for each month or part of a month the tax remains unpaid. That figure is the standard rate. A taxpayer who owes a balance after the filing deadline and has received no levy warning is being charged at 0.5 percent, not 1 percent.
The distinction matters because the doubled figure is easy to read as a general rule. It is not. Headlines and forum posts that quote “1 percent a month” without the trigger describe a conditional escalation, one that follows a specific piece of agency correspondence and a specific waiting period.
The trigger: a levy notice and ten silent days
According to the same IRS page, if tax goes unpaid for 10 days after the taxpayer receives a notice stating the agency’s intent to levy, the failure-to-pay penalty becomes 1 percent per month or partial month. Two conditions therefore have to be met together. The IRS must have issued the intent-to-levy notice, and ten days must have elapsed since the taxpayer received it with the balance still unpaid.
A levy is the legal seizure of property to satisfy a tax debt, and the notice of intent is the formal warning that one may follow. The penalty change is therefore tied to the enforcement ladder rather than to the age of the debt. A balance that is three years old but has never produced a levy notice stays at 0.5 percent per month, while a much newer balance that has reached the notice stage and passed the ten-day mark moves to 1 percent.
The IRS page does not describe the step as retroactive, and its wording speaks of the rate that applies once the ten days pass. Months already charged at 0.5 percent are not restated under the new rate on the language of that page.
A partial month is billed as a whole one
Timing quirks make the escalation costlier than the headline rate suggests. The IRS says it applies full monthly charges, even if the taxpayer pays the tax in full before the month ends. Under the 1 percent tier, a payment made two days into a new month still draws the entire month’s charge.
The arithmetic below is illustration, not an IRS figure. If a balance sat unpaid at 0.5 percent for eight months and then moved to 1 percent for three more, the accumulated penalty would be 4 percent plus 3 percent, or 7 percent of the unpaid tax. The rate applies to the unpaid tax, so any payment that reduces the balance reduces the base on which later months are computed.
The 25 percent ceiling and how fast each tier reaches it
The IRS says the failure-to-pay penalty will not exceed 25 percent of the unpaid taxes. At 0.5 percent a month, reaching that ceiling takes 50 months. At 1 percent a month, it takes 25. The levy-notice tier therefore halves the time to the cap for a balance that stays unpaid, though the cap itself does not change.
The penalty is also not the whole cost. The IRS posts separate underpayment interest rates, and the agency’s quarterly interest rate page lists 7 percent for the quarter running October 1 through December 31, 2026, drawn from Internal Revenue Bulletin 2026-36. Interest and penalty accrue as distinct charges on a balance that remains open.
What keeps a balance out of the higher tier
The agency’s rules carry an offsetting provision. For an individual who filed the return on time and has an approved payment plan, the failure-to-pay penalty is reduced to 0.25 percent per month. The 1 percent tier is triggered by an unanswered levy warning, not by the existence of a balance alone.
The failure-to-file side interacts with all of this. The IRS’s failure-to-file penalty page explains that when both penalties apply in a month, the filing penalty is reduced by the payment penalty for that month. A taxpayer who both filed late and ignored a levy notice carries both calculations, each with its own 25 percent cap.
What the IRS pages establish and what they leave out
The failure-to-pay page, last reviewed or updated on June 5, 2026, supports every rate in this report: the 0.5 percent baseline, the 1 percent tier after a levy notice and ten days, the full-month rule, the 25 percent ceiling and the 0.25 percent plan rate. It names no individual official, so the claims rest on the Internal Revenue Service as an institution. It also does not forecast how many taxpayers reach the levy-notice stage in a year, and no such figure is asserted here.
A notice decoder and trace steps for refund-side IRS letters
Penalty and levy letters are one kind of IRS mail. A separate pile concerns refunds: checks that never arrived, refunds held or reduced, and returns never filed at all. Readers in that second group face a different problem, which is working out what a refund notice is asking and what the next step is.
The IRS Refund Recovery Kit is a 13-page kit that includes a notice decoder, the refund-trace steps (Form 3911) and a refund status tracker spreadsheet for keeping those letters and dates in order.
Walk through the Form 3911 refund-trace steps in The IRS Refund Recovery Kit →
This article was produced with AI assistance and checked against the IRS pages cited above before publication.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
