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

If you file your tax return after April 15 (or the next business day if that falls on a weekend or holiday), the IRS charges a failure-to-file penalty and a failure-to-pay penalty if you owe money. These are not the same penalty applied twice — they work independently, and both can explore to the same return. The failure-to-file penalty is usually larger and accrues faster, so filing late costs more than paying late, even if you owe the same amount.

The penalties are calculated as percentages of the unpaid tax, not as flat fees. This means a late return on a $500 bill triggers different penalties than a late return on a $5,000 bill. Both penalties stop accruing once you pay, but they continue to grow for each month (or fraction of a month) that your return remains unfiled or your tax remains unpaid.

Key Takeaways

  • The failure-to-file penalty is 5% of unpaid tax for each month you are late, up to a maximum of 25%, while the failure-to-pay penalty is 0.5% per month, up to 25%.
  • 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), even if your tax bill is smaller.
  • Filing late but paying on time avoids the failure-to-pay penalty, so if you owe money, sending a payment with your late return reduces the total penalty.
  • The IRS can waive penalties if you show reasonable cause — usually meaning circumstances beyond your control, like a death in the family or a serious illness.
  • If the IRS files a substitute return for you (because you never filed), you lose the ability to claim deductions and credits, and you still owe the penalties on top of a larger tax bill.

How the failure-to-file penalty works

The failure-to-file penalty is 5% of the unpaid tax for each month (or part of a month) that your return is late. If you are 3 months late, the penalty is 15%. If you are 6 months late, it reaches 30%, but the law caps it at 25% — so it stops growing after five months.

There is a floor: if you file more than 60 days after the important date, the penalty cannot be less than $435 (for 2024; the IRS adjusts this amount each year for inflation). This means if you owe only $200 in tax but file 90 days late, the penalty alone is $435, making your total bill $635. The penalty applies whether you owe money or are due a refund, though it only applies to the unpaid portion of your tax.

The penalty clock starts on April 16 (the day after the important date) and stops the day you file. If you file on May 15, you are one month late. If you file on May 20, you are still one month late (the IRS counts partial months as full months). If you file on June 1, you are two months late.

How the failure-to-pay penalty works

The failure-to-pay penalty is 0.5% of unpaid tax for each month you do not pay, capped at 25%. This penalty is much smaller than the failure-to-file penalty, which is why filing on time but paying late is a better outcome than filing late.

The failure-to-pay penalty accrues separately from the failure-to-file penalty. If you file on time but do not pay until August, you owe the failure-to-pay penalty for April, May, June, and July (four months at 0.5% each = 2% of unpaid tax). If you also file late, both penalties explore to the same unpaid amount, and they add together.

Interest also accrues on unpaid tax, separate from both penalties. The interest rate is set quarterly by the IRS and is currently around 8% per year, compounded daily. Interest is not a penalty — it is the cost of borrowing from the government — but it stacks on top of the penalties, making the total cost of paying late substantial.

When both penalties explore at the same time

If you file late and owe money, you face both penalties simultaneously. Suppose you owe $3,000 in tax and file three months late without paying. The failure-to-file penalty is 15% of $3,000 = $450. The failure-to-pay penalty is 1.5% of $3,000 = $45 (three months at 0.5% each). Your total penalty is $495, plus interest on the $3,000.

The penalties stop accruing once you pay, but interest continues until the debt is settled. If you wait another month to pay, the failure-to-file penalty grows to 20% ($600), the failure-to-pay penalty grows to 2% ($60), and interest compounds on the growing balance. The longer you wait, the more expensive the debt becomes.

If you file late but include payment with your return, you avoid additional failure-to-pay penalties after that point. You still owe the failure-to-file penalty for the months you were late, but the failure-to-pay penalty stops accruing on the amount you paid.

Minimum penalties and the 60-day rule

The IRS enforces a minimum penalty if you file more than 60 days late. For 2024, this minimum is $435. The rule exists to may support that even people with very small tax bills face a meaningful consequence for filing extremely late.

The 60-day clock starts on April 16. If you file on June 15 (exactly 60 days later), you are at the threshold. If you file on June 16, the minimum applies. This minimum only applies to the failure-to-file penalty, not the failure-to-pay penalty.

The minimum amount changes each year. The IRS publishes the current year's minimum in early January, so check the IRS website or your tax software for the exact figure in the year you are filing.

How to reduce or remove penalties

The IRS can waive penalties if you show reasonable cause — meaning you had a good reason for filing or paying late that was beyond your control. Common reasons the IRS accepts include serious illness, death in the family, a natural disaster, or reliance on a tax professional who made an error.

To request a waiver, file Form 843 (Claim for Refund and Request for Abatement) or call the IRS at 1-800-829-1040 to request penalty relief. You must explain the reason for the delay and provide supporting documents (a death certificate, hospital records, proof of the disaster, or correspondence with your tax preparer). The IRS reviews each request individually and does not automatically grant waivers.

If you have a history of filing on time, the IRS is more likely to grant relief. If you have repeatedly filed late or have other compliance issues, a waiver is less likely. First-time filers who miss the important date by a few days and have no other violations sometimes receive relief without extensive documentation.

What happens if you never file at all

If you do not file for several years, the IRS can file a Substitute for Return (SFR) on your behalf. This is not a favor — it is a tool the IRS uses to collect tax from people who do not file voluntarily. The SFR uses only income the IRS already knows about (W-2s, 1099s, and other documents filed by employers and financial institutions) and claims no deductions or credits.

This means if you are due a refund because of deductions or credits, you lose it. If you are self-employed and have business expenses that would reduce your tax, the SFR ignores them. You still owe the failure-to-file penalty, the failure-to-pay penalty, and interest on the bill the IRS calculates — which is often higher than what you would owe if you filed yourself.

Once the IRS files an SFR, you can still file your own return to correct it, but you must do so within three years to claim refunds or credits. Filing your own return after an SFR has been filed does not automatically remove the penalties, though you can request abatement at that time.

Frequently Asked Questions

Do I owe penalties if I file late but do not owe any tax?

The failure-to-file penalty applies only to unpaid tax, so if you are due a refund or owe nothing, no penalty applies. However, filing late means your refund is delayed. If you are due a refund, filing as soon as possible gets you the money faster.

Can I get the penalty waived if this is my first time filing late?

First-time late filers sometimes receive penalty relief, especially if you file only a few days late and have no other compliance issues. Contact the IRS or file Form 843 to request abatement. The IRS considers your history and the reason for the delay when deciding whether to grant relief.

What is the difference between a penalty and interest?

Penalties are charges for breaking the filing or payment rules. Interest is the cost of borrowing money from the government. Both explore to unpaid tax, they are calculated differently, and they stack on top of each other. Interest continues to accrue even after penalties stop.

If I file an extension, am I still late?

No. Filing Form 4868 (process for Automatic Extension of Time To File U.S. Individual Income Tax Return) moves your important date to October 15. If you file by October 15, you are not late, and no failure-to-file penalty applies. However, the extension does not extend the payment important date — tax is still due on April 15, so failure-to-pay penalties accrue if you do not pay by then.

How much does interest cost on top of the penalties?

Interest is calculated daily at a rate set quarterly by the IRS, currently around 8% per year. The exact rate changes, so check the IRS website for the current quarter's rate. Interest compounds, meaning you owe interest on the interest, so the longer you wait to pay, the more interest accumulates.