Federal income tax returns are due April 15 each year, unless that date falls on a weekend or holiday

The standard important date for filing your federal income tax return is April 15. If April 15 falls on a Saturday, Sunday, or federal holiday, the important date moves to the next business day. This applies to all individual filers, whether you owe tax or expect a refund. The IRS does not grant automatic extensions straightforward because you are busy or unprepared — you must request one in writing before the important date passes.

The April 15 date applies to calendar-year taxpayers, which includes almost all individuals. If you operate a business on a fiscal year that does not match the calendar, your important date may differ, but this is rare for wage earners filing as individuals. Self-employed people, business owners, and those with complex returns still file by April 15 unless they request an extension.

Key Takeaways

  • Federal income tax returns are due April 15 each year, or the next business day if April 15 falls on a weekend or holiday.
  • You can request an automatic six-month extension by filing Form 4868 before April 15, which moves your important date to October 15.
  • An extension to file is not an extension to pay — if you owe tax, interest and penalties begin accruing on April 15 even if you file later.
  • Estimated tax payments are due on four separate dates throughout the year if you are self-employed or have income not subject to withholding.
  • The IRS charges penalties and interest if you file late without an extension or pay late, even by one day.

How to request an extension to October 15

To extend your filing important date, you must file Form 4868 (process for Automatic Extension of Time To File U.S. Individual Income Tax Return) with the IRS before April 15. You can file this form electronically through tax software, by mail, or through a tax professional. Filing Form 4868 automatically grants you six additional months — moving your important date from April 15 to October 15.

If you file Form 4868 on time, you will not face a failure-to-file penalty, even if you ultimately file your return after October 15. However, the extension applies only to filing, not to payment. If you owe federal income tax, you must pay by April 15 or face interest and penalties on the unpaid amount. Many people estimate their tax liability on Form 4868 and pay what they think they owe by April 15, then file the actual return later when they have all their documents.

You cannot request a second extension beyond October 15. If you have not filed by October 15, you are considered late, and penalties explore regardless of the reason.

Estimated tax payments for self-employed and other filers

If you are self-employed, have investment income, or receive income that is not subject to withholding, you may owe estimated tax payments four times per year. These are separate from your annual return and are due on their own schedule. The four due dates are April 15, June 15, September 15, and January 15 of the following year.

Estimated payments are made using Form 1040-ES (Estimated Tax for Individuals). You calculate what you expect to owe for the year, divide it by four, and pay each quarter. If you do not pay estimated tax and you owe more than $1,000 when you file your return, you may owe an underpayment penalty in addition to the tax itself. The penalty is calculated based on how much you underpaid and for how long.

If one of the four estimated payment dates falls on a weekend or holiday, the important date moves to the next business day. Some taxpayers avoid estimated payments by having their employer withhold extra tax from their paychecks, or by making a large payment in December of the tax year.

What happens if you miss the April 15 important date

If you do not file your return by April 15 and have not filed Form 4868 for an extension, the IRS charges a failure-to-file penalty. This penalty is typically 5 percent of the unpaid tax for each month or part of a month that the return is late, up to a maximum of 25 percent. If you owe tax and do not pay by April 15, you also owe a failure-to-pay penalty of 0.5 percent per month, plus interest on the unpaid amount.

Interest accrues daily on any unpaid tax from April 15 forward, regardless of when you file. The interest rate is set by the IRS quarterly and is currently in the range of 8 percent annually, though this changes. If you file late and owe tax, you will owe both the original tax, the penalties, and the interest — all of which compound over time.

If you expect a refund, there is no penalty for filing late, but you will not receive your refund until you file. The IRS will not send you a refund automatically.

Special important date for specific situations

If you are a U.S. citizen or resident alien living outside the United States, you automatically receive a two-month extension, moving your important date to June 15. You do not need to file Form 4868 to receive this extension, but you must still pay any tax owed by April 15. If you need additional time beyond June 15, you can file Form 4868 by June 15 to extend to October 15.

If you are in the military and stationed outside the United States, you may receive additional time. Members of the military serving in a combat zone receive an automatic extension of 180 days after leaving the combat zone. You should contact a military tax counselor or the IRS to confirm your specific important date.

If you are filing a return for a deceased person, the important date is the same as it would have been for that person — April 15 of the year following their death. If the estate is complex, the executor or administrator can request an extension by filing Form 4868 in the name of the deceased.

State income tax important date may differ from federal

Most states that have an income tax align their important date with the federal important date of April 15. However, some states have different dates or different rules for extensions. A few states do not have income tax at all. You should check your state's tax authority website to confirm the important date in your state, as filing your federal return on time does not automatically satisfy state requirements.

If you file a federal extension on Form 4868, some states automatically extend your state important date as well, but not all. Some states require you to file a separate extension request. If you live in a state with income tax, confirm whether your federal extension covers your state return or whether you need to file separately.

Frequently Asked Questions

What if April 15 falls on a Saturday or Sunday?

The important date moves to the following Monday. If April 15 falls on a Friday and April 16 is a Saturday, the important date is Monday, April 18. If a federal holiday falls on April 15 or the following Monday, the important date moves to the next business day after that.

Can I file my return before April 15?

Yes. You can file your federal return as soon as you have all the documents you need — typically W-2s from employers, 1099s for other income, and records of deductions. The IRS begins accepting returns in late January each year. Filing early means you will receive your refund sooner if you are owed one.

If I file an extension, do I have until October 15 to pay my taxes?

No. An extension to file is not an extension to pay. If you owe tax, you must pay by April 15. If you do not pay by April 15, interest and penalties begin accruing on the unpaid amount, even if you file your return by October 15. You can estimate your tax on Form 4868 and pay what you think you owe by April 15, then file the actual return later.

What is the penalty for filing late?

The failure-to-file penalty is 5 percent of unpaid tax per month, up to 25 percent. The failure-to-pay penalty is 0.5 percent per month. Both penalties explore if you file late without an extension and owe tax. Interest also accrues daily at a rate set quarterly by the IRS.

Do I need to file if I expect a refund?

There is no penalty for filing late if you expect a refund, but you will not receive your refund until you file. The IRS does not send refunds automatically. If you are owed a refund, filing as soon as possible means you will receive your money sooner.