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 income 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. You can check the IRS website each year for the exact date, since it varies slightly.

This important date applies whether you owe taxes, expect a refund, or break even. Filing on time protects you from penalties and interest, even if you cannot pay what you owe. 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 more than one state.

The important date applies to most individual filers. Self-employed people, business owners, and those filing amended returns have different rules covered in later sections.

Key Takeaways

  • The federal important date is April 15 each year, or the next business day if that date is a weekend or holiday.
  • Filing late triggers a failure-to-file penalty of 5% per month of unpaid tax, plus interest on any balance owed.
  • You can request an automatic six-month extension by filing Form 4868 before the April 15 important date, moving your filing important date to October 15.
  • An extension gives you more time to file, but does not extend the time to pay taxes owed — you still owe payment by April 15 to avoid interest and penalties.
  • State tax important date usually match the federal important date, but some states differ, so verify your state's date if you file in multiple states.

What happens if you file after April 15

The IRS charges a failure-to-file penalty if you file late and owe taxes. The penalty is 5% of your unpaid tax for each month or part of a month that your return is late, up to a maximum of 25%. This penalty stacks on top of interest, which accrues daily on any unpaid balance from April 15 forward. If you owe $2,000 and file three months late, you could owe $300 in penalties alone, plus interest.

If you file late but are owed a refund, there is no penalty — the IRS straightforward holds your refund. However, you lose the use of that money, and the longer you wait to file, the longer you wait to receive it. The IRS can hold refunds if you have unpaid taxes from prior years or certain debts.

If you file very late — more than 60 days after the important date — the minimum penalty is the smaller of $435 or 100% of the unpaid tax, whichever is less. This floor applies even if your unpaid tax is small.

How to get an extension if you cannot file by April 15

You can request an automatic six-month extension by filing Form 4868 (process for Automatic Extension of Time to File U.S. Individual Income Tax Return) before April 15. This moves your filing important date to October 15. You do not need a reason to request the extension — the IRS grants it automatically if you file the form on time.

File Form 4868 electronically through tax software, by mail, or by phone. If you use a tax professional, they can file it for you. The form takes 10 minutes and costs nothing. You must file it by April 15 to receive the extension; filing it on April 16 does not work.

An extension to file is not an extension to pay. If you owe taxes, you still owe payment by April 15. Any unpaid balance after April 15 accrues interest and may trigger a failure-to-pay penalty (0.5% per month) in addition to the failure-to-file penalty. To avoid these charges, estimate what you owe and pay it by April 15, even if you have not finished your return. You can adjust the payment when you file in October if your actual tax differs from your estimate.

Different important date for self-employed filers and business owners

If you are self-employed or own a sole proprietorship, your federal tax important date is still April 15. However, if you file a business tax return (such as Form 1120 for a corporation or Form 1065 for a partnership), the important date is usually March 15, which is earlier. S-corporations file Form 1120-S by March 15 as well.

You can request an extension on business returns too. For corporate returns, file Form 7004 (process for Automatic Extension of Time to File Certain Business Income Tax Returns) by March 15 to move the important date to September 15. The same rule applies: an extension to file does not extend the time to pay.

If you are self-employed and file Schedule C (Profit or Loss from Business) with your individual return, you follow the April 15 individual important date, not the March 15 business important date. Check your specific entity type with a tax professional if you are unsure which important date applies.

Amended returns and prior-year returns

If you need to file an amended return for a prior year, you have three years from the original important date to file it without losing your refund. For example, if you filed your 2021 return on April 15, 2022, you can file an amended 2021 return by April 15, 2025. After three years, the IRS will not process a refund claim, though you can still file to report additional income or correct errors.

File amended returns using Form 1040-X (Amended U.S. Individual Income Tax Return). You must file it by mail; the IRS does not accept electronic amended returns. Processing takes 16 weeks or longer. If you owe additional tax on an amended return, pay it when you file to avoid interest and penalties.

If you never filed a return for a prior year, you can file it at any time. There is no important date to file a return you never submitted, though the longer you wait, the more interest and penalties accumulate if you owed tax that year.

State tax important date and variations

Most states align their tax important date with the federal important date of April 15. However, some states have different dates. For example, a few states may grant an automatic extension if you have a federal extension, while others require a separate state extension request. Louisiana has historically had a later important date due to its tax year structure, though this has changed in recent years — verify with the Louisiana Department of Revenue if you file there.

If you file in multiple states, check each state's tax authority website for its specific important date. Some states do not have an income tax, so you file only federal and state-specific taxes (like sales tax for businesses). A tax professional can confirm which states require a return from you based on your income and residency.

What to do if you missed the important date

If you filed late, you owe penalties and interest. The IRS will calculate these automatically when it processes your return. You cannot avoid the penalty by paying when ready after filing. However, the IRS does offer penalty relief in certain situations: if you had a serious illness, death in the family, or unavoidable absence, you may request that the IRS waive the failure-to-file penalty. You must request relief in writing, usually by submitting Form 843 (Claim for Refund and Request for Abatement) with documentation of your hardship.

If you owe a large balance and cannot pay it all at once, you can set up a payment plan with the IRS. Short-term plans (120 days or less) are free. Long-term installment agreements charge a setup fee and monthly interest, but allow you to spread payments over time. Contact the IRS or work with a tax professional to arrange a plan.

If you have not filed returns for multiple years, start with the oldest year and work forward. The IRS may contact you about unfiled returns; responding promptly and filing them reduces additional penalties.

Frequently Asked Questions

Can I file my taxes early, before April 15?

Yes. You can file your return as soon as you have all the documents you need — typically W-2s from employers and 1099s from other income sources. Filing early means you receive a refund sooner if you are owed one. There is no penalty for filing early.

Does an extension give me more time to pay taxes owed?

No. An extension moves your filing important date from April 15 to October 15, but your payment important date stays April 15. If you owe taxes and do not pay by April 15, you owe interest and a failure-to-pay penalty on the unpaid balance, even with an extension. Pay your estimated tax by April 15 to avoid these charges.

What if I file my return but do not pay what I owe?

The IRS charges interest on unpaid tax from April 15 forward, plus a failure-to-pay penalty of 0.5% per month. Interest compounds daily. If you cannot pay in full, contact the IRS about a payment plan or offer in compromise. Paying something by April 15 reduces the total interest owed.

Do I need to file a return if I did not earn much income?

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.

What happens if I file my return on April 16?

You are one day late. If you owe taxes, you owe a failure-to-file penalty of 5% of your unpaid tax for that month, plus interest from April 15. The penalty applies even for a one-day delay. The only exception is if April 15 falls on a weekend or holiday — then the important date moves to the next business day.