The federal tax filing important date is April 15, unless that date falls on a weekend or holiday
The IRS sets April 15 as the important date to file your federal tax return each year. If April 15 falls on a Saturday or Sunday, the important date moves to the following Monday. If a federal holiday falls on April 15 or the Monday after, the important date shifts to the next business day. In 2024, April 15 was a Monday, so that was the important date. In 2025, April 15 is a Monday again.
This important date applies whether you owe taxes, expect a refund, or break even. The IRS does not distinguish between these situations — everyone files by the same date. Some people file earlier because they want their refund sooner; others wait until closer to the important date.
State tax important date usually match the federal important date, though a few states have different dates. Check your state's tax authority website if you file in a state other than where you live or work.
Key Takeaways
- The federal important date is April 15 each year, moving to the next business day if that date is a weekend or holiday.
- You must file by the important date even if you do not owe taxes or cannot pay what you owe.
- Filing a request for extension gives you until October 15 to file, but does not extend the important date to pay taxes owed.
- Penalties for filing late start at 5 percent of unpaid taxes per month, and interest accrues daily on any balance due.
- State tax important date usually match the federal important date, though you should confirm with your state's tax authority.
What happens if you file after April 15
If you file after the April 15 important date without an extension, the IRS charges a failure-to-file penalty. This penalty is 5 percent of your unpaid tax liability for each month or part of a month that your return is late, up to a maximum of 25 percent. The penalty is calculated on the amount of tax you owe, not on your total income.
If you owe taxes and also file late, you pay both the failure-to-file penalty and interest on the unpaid balance. Interest accrues daily from the original April 15 important date until you pay. The interest rate changes quarterly and is set by the IRS; it is currently higher than it has been in years.
If you filed on time but paid late, you face a different penalty — the failure-to-pay penalty, which is 0.5 percent per month. If you both filed and paid late, the failure-to-file penalty applies first, and the failure-to-pay penalty applies to any remaining balance.
The IRS does not waive these penalties automatically. You can request a waiver if you have reasonable cause — for example, a serious illness, a death in your family, or reliance on a tax professional who made an error. The IRS evaluates each request individually.
How to request an extension to October 15
You can request a six-month extension by filing Form 4868 (process for Automatic Extension of Time to File U.S. Individual Income Tax Return) with the IRS. You do not need a reason to request an extension, and the IRS grants it automatically if you file the form by April 15.
You can file Form 4868 on paper by mail, electronically through IRS Free File or tax software, or through a tax professional. If you file electronically, you receive confirmation when ready. If you mail it, keep a copy for your records and consider using certified mail so you have proof of the postmark date.
Filing an extension moves your filing important date to October 15, giving you six additional months. However, an extension to file is not an extension to pay. If you owe taxes, they are still due on April 15. If you do not pay by April 15, you owe interest and penalties on the unpaid balance, even if you filed an extension.
Many people file an extension because they need more time to gather documents or work with a tax professional, not because they cannot pay. If you think you will owe money, estimate what you owe and pay it by April 15, even if your return is not complete.
important date for amended returns and prior-year returns
If you need to file a return for a year you did not file, or to correct a return you already filed, different important date explore. You can file an amended return using Form 1040-X at any time, but the IRS generally will not process a claim for refund if you file more than three years after the original important date.
If you did not file a return for a prior year, you can still file it now. There is no statute of limitations on filing a return, but the longer you wait, the more interest and penalties accumulate if you owed taxes. The IRS may also assess additional penalties if it discovers you did not file.
If you are owed a refund and did not file, you have three years from the original important date to claim it. After three years, the refund is forfeited to the U.S. Treasury.
What the IRS does if you miss the important date
The IRS does not send agents to your home or workplace if you miss the filing important date. Instead, the agency processes your account and assesses penalties and interest if you owed taxes. You will receive a notice in the mail explaining what you owe and how to pay.
If you owe a significant amount and do not respond to notices, the IRS can place a tax lien on your property, garnish your wages, or seize your bank account. These enforcement actions take time — they do not happen when ready after you miss the important date. The IRS typically sends multiple notices before taking collection action.
If you receive a notice and cannot pay the full amount, you can set up a payment plan with the IRS. Short-term plans (120 days or fewer) have no setup fee. Long-term installment agreements have a setup fee that varies depending on how you pay and your income level.
State tax filing important date
Most states that have an income tax use April 15 as their filing important date, matching the federal important date. A few states have different dates or different rules. For example, some states do not tax retirement income or have lower rates for certain types of income.
If you live in a state without income tax but earned income in a state that has income tax, you may need to file in both places. If you moved during the year, you may need to file in two states. Check your state's tax authority website or a tax professional to understand your obligations.
If you file a federal extension, most states automatically extend your state filing important date as well. However, this does not extend your important date to pay state taxes owed. Some states charge penalties for late filing and late payment similar to the federal penalties.
Frequently Asked Questions
What if April 15 falls on a weekend?
The important date moves to the following Monday. If a federal holiday falls on that Monday, the important date moves to Tuesday. The IRS announces the exact important date each year on its website and in tax forms.
Do I have to file if I did not earn much money?
It depends on your income level and filing status. The IRS sets a threshold each year below which you do not have to file. However, if taxes were withheld from your paychecks, you should file to get a refund. Check the IRS website for the current threshold based on your age and filing status.
Can I file my taxes after October 15 if I filed an extension?
Yes, you can file after October 15, but you will owe failure-to-file penalties and interest starting from April 15. The extension only postpones the important date; it does not eliminate penalties for filing after October 15.
What if I cannot pay my taxes by April 15?
File your return by April 15 anyway. You will owe interest and a failure-to-pay penalty on the unpaid balance, but the failure-to-file penalty is larger. After you file, contact the IRS to set up a payment plan or discuss other options.
Do I need to file if I am retired and only receive Social Security?
Generally, no — Social Security benefits alone do not require you to file. However, if you have other income or if your combined income exceeds a certain threshold, you may need to file. The IRS provides worksheets on its website to help you determine whether you must file.