IRS Late Payment & Filing Penalties

Understanding IRS Late Payment Penalties: Rates, Relief Options, and How to Minimize Them

Missing a tax payment deadline can become costly, but understanding the IRS failure-to-pay penalty—and the steps you can take—helps you limit the impact.

The failure-to-pay penalty applies when you do not pay the full tax owed by the original due date (usually April 15 for individuals). An extension of time to file does not extend the time to pay. The penalty is 0.5% of the unpaid taxes for each month or part of a month the balance remains unpaid, up to a maximum of 25%. Unpaid tax equals the total tax required to be shown on your return minus withholding, estimated payments, and refundable credits.

For example, $8,000 left unpaid for six months would generate a $240 failure-to-pay penalty (0.5% × 6) before interest is added. If the IRS issues a notice of intent to levy and payment is not made within 10 days, the rate increases to 1% per month. Conversely, if you filed on time as an individual and enter an approved installment agreement, the rate drops to 0.25% while the plan is in effect.

Interest accrues separately on unpaid tax (and later on penalties), compounding daily at the federal short-term rate plus 3 percentage points. The failure-to-file penalty is steeper at 5% per month (maximum 25%). When both penalties apply in the same month, the failure-to-file amount is reduced by the failure-to-pay portion for that month.

To minimize costs:

File your return on time even if you cannot pay in full—this avoids the higher failure-to-file penalty.

Pay as much as possible by the due date; partial payments reduce the base on which penalties and interest grow.

Set up an installment agreement through IRS.gov to qualify for the reduced 0.25% rate and ease collection pressure.

Seek relief when eligible. Reasonable cause—such as a natural disaster, serious illness, or inability to obtain records—may allow abatement if you exercised ordinary care (note that lack of funds alone is generally not sufficient). Taxpayers with a strong three-year compliance history may also qualify for administrative relief under First Time Abate or the Automatic Exemption from Penalty (AEP) program that began in summer 2026, which can prevent the penalty from being assessed.

Act quickly. The sooner you address the balance, the less you will ultimately owe.

If you need assistance with any of these matters, please call me, Robert Franko, CPA.

Thank you!

IRS Income Understatement Penalties

Understanding the IRS Penalty for Understatement of Income on Your Tax Return

Accurately reporting all of your income is one of the most important responsibilities when filing a federal tax return. Understatement of income—whether from omitted wages, freelance earnings, investment income, or other sources—can trigger the IRS accuracy-related penalty under Internal Revenue Code Section 6662. This penalty is designed to promote careful compliance and can add a significant cost to any additional tax owed.

The Accuracy-Related Penalty Explained

The accuracy-related penalty generally equals 20 percent of the underpayment of tax attributable to either negligence (or disregard of rules and regulations) or a substantial understatement of income tax. Negligence includes failing to make a reasonable attempt to comply with the tax laws, such as ignoring income reported on Forms 1099 or not maintaining adequate records.

A substantial understatement of income tax exists for most individuals when the understatement exceeds the greater of 10 percent of the tax required to be shown on the return or $5,000. If you claim the Qualified Business Income deduction under Section 199A, the threshold is lowered to the greater of 5 percent of the required tax or $5,000. For corporations other than S corporations or personal holding companies, the understatement is substantial if it exceeds the lesser of 10 percent of the tax required to be shown on the return (or $10,000 if greater) or $10 million.

An understatement is the excess of the correct tax over the amount of tax shown on the return, reduced by any rebates. The IRS often discovers underreported income by matching your return against third-party information returns such as Forms W-2 and 1099.

Related Consequences

In addition to the 20 percent penalty, interest accrues on both the underpayment of tax and the penalty itself. Separately, if you omit more than 25 percent of the gross income stated on your return, the normal three-year statute of limitations for the IRS to assess additional tax extends to six years. (Fraud carries a much steeper 75 percent civil penalty under Section 6663.)

How to Avoid or Reduce the Penalty

Several defenses can reduce or eliminate the accuracy-related penalty. The amount of any understatement is reduced for items for which you have substantial authority, or for positions that have a reasonable basis and are adequately disclosed—typically by attaching Form 8275, Disclosure Statement, to the return.

More broadly, no accuracy-related penalty is imposed on any portion of an underpayment if you can show that there was reasonable cause for the underpayment and that you acted in good faith. The IRS makes this determination based on all the facts and circumstances, with the most important factor being the effort you made to assess your proper tax liability. Reasonable reliance on the advice of a qualified tax professional, when you provided complete and accurate information, can support a reasonable-cause defense.

Protecting Yourself

The most effective protection is accurate reporting from the outset. Carefully review all information returns you receive, maintain thorough records, and seek professional guidance for complex or uncertain tax positions. If you later discover an error, filing an amended return can limit further issues. Should you receive a notice proposing the penalty, respond promptly with documentation supporting reasonable cause.

This article provides general information based on current IRS rules and is not tax advice. Tax situations vary, so consult a qualified tax professional like me for guidance specific to your circumstances.

I’m here to take away the stress from your IRS mess.

Thank you,

Robert Franko, CPA