For the 2019 calendar year, the IRS federal tax underpayment penalty interest rates were 6% for the first quarter (January–March) and 5% for the fourth quarter (October–December). The penalty is based on the interest rate on underpayments of tax, which can change quarterly.
The IRS underpayment penalty rate is based on a quarterly-adjusted interest rate (currently 7% for individuals for early 2026, same as late 2025), applied to the amount and duration of your underpayment, plus a separate failure-to-pay penalty of 0.5% per month (up to 25%) on taxes not paid by the due date, increasing to 1% if you ignore a levy notice, and 0.25% if on a payment plan.
Section 6651(a)(1) Penalty
5% net tax liability due for the year, increasing 5% for each additional month the failure to file continued (or fraction thereof), up to 25% of the outstanding net tax liability due.
0.5% of the unpaid tax for each month or part of the month it's unpaid not to exceed 40 months (monthly).
The interest rate determined for fiscal year 2019 in accordance with the above-quoted formula is 2.9176% which adjusted to the nearest 1/8 of 1% is 2-7/8%.
For individuals, the rate for overpayments and underpayments will be 7% per year, compounded daily.
Over the course of 2025, since Trump took office, rates have dropped from 6.96% to a recent low of 6.17%, she added, which explains why the yearly cost of a mortgage has trended lower over Trump's term. The 30-year mortgage rate stood at 6.22% as of Dec.
The IRS underpayment penalty is triggered when you don't pay enough tax throughout the year, typically by failing to meet safe harbor rules: either paying less than 90% of your current year's tax liability or less than 100% (or 110% for high earners) of your prior year's tax, and owing $1,000 or more in tax after credits and withholding, or by paying estimated taxes late. Common causes include insufficient tax withholding from paychecks, underestimating income from self-employment, or not making timely quarterly estimated tax payments.
If you've not paid the right amount of tax. If you've paid too much or too little tax by the end of the tax year (5 April), HM Revenue and Customs ( HMRC ) will send you either: a tax calculation letter (also known as a P800) a Simple Assessment letter.
Avoid a penalty
You may avoid the Underpayment of Estimated Tax by Individuals Penalty if: Your filed tax return shows you owe less than $1,000 or. You paid at least 90% of the tax shown on the return for the taxable year or 100% of the tax shown on the return for the prior year, whichever amount is less.
You might have to pay IRS penalties and interest if you file your federal income tax return after the April deadline, your due date isn't extended, and you end up with a tax bill. First, the IRS charges a 5% penalty per month on any tax due if your return is filed late. The penalty is capped at 25% of the tax owed.
The IRS 3-year rule generally refers to the statute of limitations for claiming a tax refund, which is typically 3 years from when you filed your original return or 2 years from when you paid the tax, whichever is later, for the IRS to process your claim. For an audit, the IRS generally has 3 years from the date your return was filed or due (whichever is later) to assess additional tax, though this can extend to 6 years if you significantly underreport income or omit foreign income.
Taxpayers usually have three years to file and claim their tax refunds. The three-year deadline for filing 2019 returns to claim a refund was in 2022, but the IRS postponed the deadline to July 17, 2023, due to the COVID-19 pandemic.
We may be able to remove or reduce some penalties if you acted in good faith and can show reasonable cause for why you weren't able to meet your tax obligations. By law we cannot remove or reduce interest unless the penalty is removed or reduced. For more information, see penalty relief.
Generally, most taxpayers will avoid this penalty if they either owe less than $1,000 in tax after subtracting their withholding and refundable credits, or if they paid withholding and estimated tax of at least 90% of the tax for the current year or 100% of the tax shown on the return for the prior year, whichever is ...
Failure to file or pay penalties
Fires, natural disasters or civil disturbances. Inability to get records. Death, serious illness or unavoidable absence of the taxpayer or immediate family. System issues that delayed a timely electronic filing or payment.
HMRC's investigations can only go back a certain amount of time based on how serious the situation is, as outlined in the table below: Genuine mistakes - investigate back 4 years. Carelessness - investigate back 6 years. Offshore matters/offshore transfers - investigate back 12 years.
Common reasons for getting a tax bill
Common tax return mistakes that can cost taxpayers
5 Common Mistakes That Lead to Employee Underpayments
The IRS will not charge you an underpayment penalty if: You pay at least 90% of the tax you owe for the current year, or 100% of the tax you owed for the previous tax year, or.
Yes, most economic analyses suggest President Trump's tariffs are hurting the U.S. economy, increasing costs for consumers and businesses, causing layoffs, reducing investment, and creating economic uncertainty, although some sectors see limited gains while facing retaliation, leading to overall negative impacts like higher prices and reduced trade. While the tariffs aim to protect domestic industry, they act as a tax, raising prices and reducing available goods, with studies pointing to job losses in manufacturing and decreased business confidence.
Real GDP growth averaged a robust 3.4% during the first three years of the Biden presidency. The labor market was strong in 2023. The unemployment rate averaged a very low 3.6% in 2023, as it had in 2022; the last year with an average 3.5% unemployment rate was 1969.