Failure to Pay Penalty

The Failure to Pay Penalty is an IRS penalty assessed when taxpayers don’t pay the full amount of taxes owed by the due date shown on their tax return or IRS notice. This penalty accrues monthly at 0.5% of the unpaid tax balance, with a maximum penalty of 25% of the unpaid amount. While often confused with the failure-to-file penalty, the failure-to-pay penalty specifically addresses late payment rather than late filing.

The penalty begins accruing the day after the tax filing deadline (typically April 15) or the date shown on an IRS notice demanding payment. It continues accumulating until the tax is paid in full or the 25% maximum is reached. If you file your return on time but don’t pay, you’ll only face the failure-to-pay penalty. However, if you both file late and pay late, you’ll face both penalties simultaneously, though the failure-to-file penalty is reduced by the failure-to-pay penalty amount for overlapping months.

The penalty rate increases to 1% per month if the tax remains unpaid 10 days after the IRS issues a final notice of intent to levy, or to 1% per month after the IRS issues a notice and demand for immediate payment. Conversely, if you establish an installment agreement by the return due date, the penalty rate reduces to 0.25% per month while payments remain current.

To avoid the failure-to-pay penalty, pay your full tax liability by the due date, file Form 4868 and pay at least 90% of your tax liability by the original deadline (reducing penalties on the unpaid portion), or establish an installment agreement if you cannot pay in full. Interest also accrues on unpaid tax from the due date, compounding the total amount owed.

You can request penalty abatement based on reasonable cause if circumstances beyond your control prevented timely payment, such as serious illness, natural disasters, or unavoidable financial hardship. First-time penalty abatement is also available for taxpayers with clean compliance history. The failure-to-pay penalty is assessed separately from tax and interest, appearing as a distinct charge on your account statement.