How Much Can You Owe the IRS Without Penalty?

You can owe the IRS up to $1,000 at filing time without any underpayment penalty. That is the short answer to how much you can owe the IRS without penalty, but it is not the whole picture. The IRS runs a pay-as-you-go system and looks at what you paid across the year through withholding and estimated payments, not just the balance on your April return. Two safe harbor rules let you owe far more than $1,000 and still avoid the penalty, as long as your payments during the year hit the right benchmarks.¹

The $1,000 Threshold

If the gap between your total tax and what you already paid through withholding and refundable credits is under $1,000, no underpayment penalty applies. The timing of your payments during the year does not matter for this rule. It is the number most people are actually asking about when they want to know how big a balance they can carry into April without consequences.¹

When You Can Owe Any Amount Without Penalty

A separate exception covers taxpayers who had zero tax liability in the prior year. If last year’s return covered a full 12-month period, showed no tax due, and you were a U.S. citizen or resident for the entire year, no underpayment penalty applies this year regardless of how much you end up owing.¹ This often applies to someone who had a gap year with little or no income and then earned substantially more the following year.

Safe Harbors That Let You Owe More Than $1,000

If you expect to owe more than $1,000, the way to avoid the penalty is to satisfy one of two safe harbors. You only need to meet the lower of the two thresholds.

90% of This Year’s Tax

If your combined withholding and estimated payments cover at least 90% of your current-year tax, you are protected. Someone whose total tax comes to $40,000 needs at least $36,000 paid in during the year; the remaining $4,000 due at filing carries no penalty.² This rule tends to be the better fit when your income climbed compared to last year.

100% or 110% of Last Year’s Tax

Alternatively, you can base your required payments on last year’s tax rather than trying to predict this year’s. Payments equal to 100% of the tax shown on last year’s return satisfy the safe harbor, and this is the standard method for freelancers, business owners, and anyone whose income fluctuates too much to estimate reliably.²

Higher earners face a stiffer version. If your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), you need payments equal to 110% of last year’s tax rather than 100%.² If last year’s total tax was $200,000, a high-income taxpayer needs $220,000 paid in during the current year to be fully protected.

Two conditions limit this method. The prior-year return must cover a full 12-month tax year, and you must have actually filed a return for that year. If either condition fails, the prior-year safe harbor is unavailable and you have to rely on the 90% current-year test.¹

What Counts as Your Total Tax

The safe harbor percentages apply to your total tax liability, not just the income tax line on your return. This catches people out. The calculation on Form 2210 starts with the tax from Form 1040 and then adds several items from Schedule 2 that many taxpayers overlook, including the alternative minimum tax, additional Medicare tax, and net investment income tax.³ If you are estimating payments mid-year, build those in or you may miss the safe harbor you thought you had hit.

What the Penalty Costs If You Miss

When you owe $1,000 or more and clear neither safe harbor, the IRS charges what works essentially like interest on each late installment. The rate is the federal short-term rate plus three percentage points and resets every quarter.⁴ For 2026, the rate started at 7% in the first quarter and dropped to 6% in the second.

The IRS treats your annual tax as though it were due in four equal installments on April 15, June 15, September 15, and January 15 of the following year.¹ The charge runs separately on each installment that came up short, from its due date until the earlier of the filing deadline or the date you actually pay. An April 15 shortfall accrues for nearly a full year; a January 15 shortfall runs for about three months.⁵

You usually will not have to do this math yourself. The IRS calculates the penalty and bills you, unless you need to file Form 2210 for a specific reason such as requesting a waiver.⁶

Waivers That Can Erase the Penalty

Even when every safe harbor is missed, the IRS can waive or reduce the underpayment penalty in a few situations.

Retirement or Disability

If you retired after reaching age 62 or became disabled during the tax year or the year before, and the underpayment was due to reasonable cause rather than neglect, the penalty can be waived.⁷ Check the appropriate box on Form 2210 and include an explanation of the qualifying event.

Casualty, Disaster, or Unusual Circumstances

The IRS can waive the penalty when a casualty, disaster, or other unusual circumstance makes it inequitable to impose the charge.¹ In federally declared disaster areas, the IRS typically acts on its own by postponing filing and payment deadlines. If you are in a covered area and receive a penalty notice with an original due date inside the postponement period, calling the number on the notice will usually get the penalty removed.

Reasonable Cause

Outside of retirement, disability, and disasters, the IRS may waive penalties when the taxpayer can show reasonable cause and no willful neglect. Relying on incorrect written advice from the IRS itself often qualifies. A bare claim of financial hardship, without documentation, almost never does. The stronger the paper trail tying the underpayment to circumstances beyond your control, the better the odds.

The Two Bigger Penalties Once April 15 Passes

The underpayment penalty on estimated tax is not the only penalty for owing money. Two others kick in after April 15 and are far more expensive.

Failure to File

If you do not file your return by the deadline (including extensions), the penalty is 5% of the unpaid tax for each month or partial month the return is late, up to 25%.⁸ For returns filed more than 60 days late, the minimum penalty is $525 or 100% of the unpaid tax, whichever is less.⁹ Always file on time, even if you cannot pay. Filing eliminates the most expensive penalty.

Failure to Pay

If you file on time but do not pay the balance, the penalty is 0.5% of the unpaid tax per month, up to 25%.⁸ When both penalties apply in the same month, the failure-to-file rate is reduced by the failure-to-pay amount, so the combined rate is 5% per month rather than 5.5%.

Setting up an installment agreement cuts the failure-to-pay rate in half, from 0.5% to 0.25% per month, provided you filed on time.¹⁰ If you know you will owe more than you can pay in one shot, getting on a payment plan quickly is one of the simplest ways to limit what the balance costs you.

State Penalties Are Separate

Most states with an income tax impose their own underpayment penalties on top of the federal one. Annual interest rates on state underpayments generally range from about 4% to 11%, and the safe harbor thresholds may differ from the federal rules. Meeting the IRS safe harbors will not protect you from a separate state charge, so check your state tax agency’s estimated payment requirements alongside your federal planning.

1
Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
2
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
3
Internal Revenue Service. Instructions for Form 2210 (2025)
4
Internal Revenue Service. Quarterly Interest Rates
5
eCFR. 26 CFR 1.6654-1 – Addition to the Tax in the Case of an Individual
6
Internal Revenue Service. Form 2210, Underpayment of Estimated Tax by Individuals, Estates, and Trusts
7
Internal Revenue Service. Topic No. 306, Penalty for Underpayment of Estimated Tax
8
Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
9
Internal Revenue Service. Failure to File Penalty
10
Internal Revenue Service. Options for Taxpayers Who Need Help Paying Their Tax Bill