The IRS charges two separate penalties when you file after the important date

If you file your tax return after the April 15 important date (or October 15 if you got an extension), the IRS charges a failure-to-file penalty and a failure-to-pay penalty if you owe taxes. These are calculated differently, stack on top of each other, and accrue interest on top of both. The penalty amounts depend on how much tax you owe and how late you file.

The failure-to-file penalty is 5% of your unpaid taxes for each month or part of a month that your return is late. The failure-to-pay penalty is 0.5% of your unpaid taxes for each month or part of a month that the tax remains unpaid. If you file more than 60 days late, the failure-to-file penalty has a minimum of $435 (as of 2024, though this amount changes yearly). The IRS also charges interest on all unpaid taxes, compounded daily at a rate that changes quarterly.

Key Takeaways

  • Filing late triggers a failure-to-file penalty of 5% per month, with a minimum of $435 if you file more than 60 days late.
  • If you owe taxes, a failure-to-pay penalty of 0.5% per month also applies on top of the filing penalty.
  • Interest accrues daily on all unpaid taxes at a rate the IRS sets quarterly, separate from both penalties.
  • Filing your return even if you cannot pay right away stops the failure-to-file penalty from growing, though the failure-to-pay penalty and interest continue.
  • The IRS may waive penalties if you have reasonable cause, such as a serious illness, death in the family, or reliance on a tax professional's bad information.

How the failure-to-file penalty works

The failure-to-file penalty is calculated as 5% of your unpaid tax liability for each month or partial month your return is late. This means if you owe $2,000 and file one month late, you owe a $100 penalty. If you file two months late, the penalty is $200. The penalty caps at 25% of your unpaid taxes, so it stops growing after five months.

If you file more than 60 days late, the penalty has a floor: you owe at least $435 (or 100% of your unpaid tax, whichever is smaller) even if the 5% calculation would be less. This means filing 61 days late on a $100 tax bill costs you $435 in penalties alone. The IRS updates this minimum amount each year for inflation.

How the failure-to-pay penalty works

The failure-to-pay penalty is 0.5% of your unpaid taxes for each month or partial month the tax stays unpaid. Unlike the failure-to-file penalty, this one does not have a cap — it can keep growing as long as you owe money. If you owe $2,000 and do not pay for six months, the failure-to-pay penalty is $60.

The failure-to-pay penalty applies whether you file on time or late. The key difference is that filing on time stops the failure-to-file penalty from growing, but the failure-to-pay penalty continues until you actually pay the tax. This is why filing your return even if you cannot pay when ready is important — it limits the total penalties you face.

Interest compounds daily on unpaid taxes

Beyond the two penalties, the IRS charges interest on any tax you do not pay by the important date. The interest rate changes every three months and is based on the federal short-term rate plus 3%. As of late 2024, the rate is around 8% annually, but check the IRS website for the current quarter's rate since it changes.

Interest is compounded daily, meaning you owe interest on the interest that has already accrued. Over time, this can add significantly to what you owe. For example, if you owe $5,000 and do not pay for a year, interest alone could add $400 or more to your bill, depending on the rate that quarter.

What happens if you file late but do not owe taxes

If you file late but the IRS owes you a refund, you do not face a failure-to-file or failure-to-pay penalty. You straightforward receive your refund, though it may take longer to process than a timely return. However, you lose the right to claim that refund if you wait more than three years from the original important date to file.

This is one reason to file even if you think you will owe money — if you are wrong and actually have a refund coming, you preserve your right to receive it. The IRS will not send you a refund for a year you did not file a return for, no matter how much tax was withheld from your paychecks.

How to request penalty relief from the IRS

The IRS can waive penalties if you have reasonable cause — a legitimate reason you could not file or pay on time. Common reasons include serious illness or injury, death in the family, unavoidable absence, reliance on a tax professional who gave you wrong information, or a first-time penalty in the last three years. You do not need to provide documentation for some reasons, but the IRS may ask for proof depending on what you claim.

To request relief, file your return (if you have not already) and include a written explanation of why you filed or paid late. You can also call the IRS at the number on your notice if you have already received a penalty bill. The IRS reviews each request individually, and approval is not may provide, but many requests are granted, especially for first-time penalties or genuine hardship.

How filing an extension affects penalties

If you file Form 4868 (process for Automatic Extension of Time To File U.S. Individual Income Tax Return) before April 15, you get an automatic six-month extension to file your return, moving the important date to October 15. Filing an extension stops the failure-to-file penalty from accruing, but it does not extend the important date to pay taxes.

This means if you owe taxes, you should pay as much as you can by April 15, even if you file an extension. Any tax you do not pay by April 15 will accrue the failure-to-pay penalty and interest, even though you have until October 15 to file the return itself. Paying by the original important date, even if you file late, minimizes the total penalties and interest you owe.

Frequently Asked Questions

How much will I owe in penalties if I file three months late?

If you file three months late and owe $1,000 in taxes, the failure-to-file penalty is 15% ($150), and the failure-to-pay penalty depends on how long you go without paying. If you pay when ready after filing, the failure-to-pay penalty is minimal. If you wait another three months to pay, add another 1.5% ($15) for that penalty, plus interest on the $1,000 at the current quarterly rate.

Can the IRS forgive penalties if I have a good reason?

Yes, the IRS considers reasonable cause requests, which include serious illness, death in the family, or reliance on a tax professional's incorrect information. You must file your return and explain your reason in writing. The IRS reviews each case individually, and approval is not may provide, but many requests are granted, especially for first-time penalties.

What if I file on time but pay my taxes late?

Filing on time stops the failure-to-file penalty from growing, but the failure-to-pay penalty of 0.5% per month still applies to any unpaid balance. Interest also accrues daily. You avoid the larger failure-to-file penalty by filing on time, even if you cannot pay the full amount when ready.

Do I still owe penalties if I get a refund?

No. If you file late but the IRS owes you a refund, you do not face failure-to-file or failure-to-pay penalties. You straightforward receive your refund, though processing may take longer. However, you must file within three years of the original important date to claim the refund.

Does an extension give me more time to pay taxes?

No. Filing Form 4868 extends your filing important date to October 15, but taxes are still due April 15. Any unpaid tax after April 15 will accrue the failure-to-pay penalty and interest, even if you file the return in October. Pay what you can by April 15 to minimize penalties.