What happens if I miss the April 15, 2026 tax deadline? What are the penalties?

Missing the April 15 deadline triggers two separate penalties if you owe taxes, and they stack on top of each other:

Failure-to-file penalty:

• 5% of your unpaid tax for each month (or partial month) that your return is late
• Maxes out at 25% of your unpaid balance
• If you're more than 60 days late, the minimum penalty is the lesser of $510 or 100% of the tax you owe (for returns due in 2026)

Failure-to-pay penalty:

• 0.5% of your unpaid tax per month, starting April 16
• Also maxes out at 25%
• If both penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount

Interest on top of penalties:

The IRS charges interest on unpaid tax from the due date until you pay. For 2026, the rate is approximately 7-8% annually, compounded daily. Interest runs on both the unpaid tax and accumulated penalties.

If you're owed a refund, there's no penalty. The IRS doesn't penalize late filers who are due money back. However, you have 3 years from the due date to claim your refund before it's forfeited.

What to do if you can't file on time:

• File Form 4868 by April 15 for an automatic 6-month extension to October 15
• The extension gives you time to file, but it does not extend your time to pay
• If you can't pay, file anyway. The failure-to-file penalty (5%/month) is 10 times worse than the failure-to-pay penalty (0.5%/month)
• Consider an IRS installment agreement (Form 9465) or request a short-term payment plan online at IRS.gov

Bottom line: always file on time, even if you can't pay. You can negotiate payment later, but late-filing penalties add up fast.