The main filing important date is April 15 of the year after you earned income

The federal tax filing important date for most people is April 15 of the year following the tax year. For the 2024 tax year (income you earned from January 1 through December 31, 2024), you must file by April 15, 2025. This date applies whether you file on paper or electronically.

If April 15 falls on a weekend or federal holiday, the important date moves to the next business day. For example, if April 15 is a Saturday, you have until Monday, April 17. The IRS publishes the exact important date each year on its website and on tax software platforms.

This important date applies to federal income tax returns. State income 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 live outside the continental United States or in a territory.

Key Takeaways

  • The federal important date is April 15 of the year after you earned the income, unless that date falls on a weekend or holiday.
  • Filing electronically is faster than mailing a paper return, and the IRS processes e-filed returns within 21 days under normal conditions.
  • You can request an automatic six-month extension, which moves your important date to October 15, but this extends only the filing date, not the payment date.
  • If you owe taxes and miss the important date without an extension, the IRS charges penalties and interest starting the day after April 15.
  • State income tax important date usually match the federal important date, but some states have different dates you should verify separately.

What happens if you file after April 15 without an extension

Filing late without an extension triggers two separate penalties. The failure-to-file penalty is 5 percent of the unpaid tax for each month or part of a month that the return is late, up to 25 percent. The failure-to-pay penalty is 0.5 percent of unpaid tax per month, also capped at 25 percent. Both penalties accrue from the day after the important date.

Interest also accrues on any unpaid tax from the original important date date. The IRS sets the interest rate quarterly; it is currently higher than it has been in years. If you owe $2,000 and file three months late, you will owe penalties plus interest on that $2,000 for the entire three-month period, even if you pay when ready upon filing.

If you do not owe tax — because you had too much withheld or you are due a refund — filing late has no penalty. You straightforward receive your refund later. However, the IRS can hold a refund for up to three years if you do not file at all.

How to request a filing extension to October 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 the April 15 important date. You do not need a reason; the IRS grants it automatically if you file the form on time. Most tax software platforms include a tool to file Form 4868 electronically at no extra cost.

An extension moves your filing important date to October 15, but it does not extend the payment important date. If you owe tax, you must estimate what you owe and pay it by April 15, even if you file the extension. If you do not pay by April 15, you owe interest and penalties on the unpaid amount from April 16 onward, regardless of when you file the return.

To avoid penalties, pay as much as you can by April 15 if you think you will owe. You can amend your return later if you overpaid. Filing the extension form itself costs nothing, and you can file it as late as April 14 if you realize you need more time.

Different important date for self-employed people and business owners

If you are self-employed or own a business, your personal income tax important date is still April 15 unless you file an extension. However, if you file a C corporation tax return (Form 1120), the important date is March 15 of the following year, or September 15 if you file an extension. S corporations and partnerships have a March 15 important date as well.

Estimated tax payments are separate from filing important date. If you are self-employed or have income not subject to withholding, you must make quarterly estimated payments on April 15, June 15, September 15, and January 15. Missing these dates triggers penalties even if you file your annual return on time.

If you operate a business and file a separate business tax return, check the specific important date for that form type. The IRS website lists important date by entity type, and your accountant or tax software can flag the correct dates for your situation.

State income tax important date and variations

Most states with income tax use April 15 as their important date to match the federal important date. However, some states have different dates. Illinois, for example, has historically used a different important date in some years. A few states without income tax (such as Texas, Florida, and Wyoming) have no state filing important date at all.

If you file federal taxes electronically, your state return usually processes on the same timeline. Some states allow you to file state taxes separately from federal taxes, and some require you to file federal first. Check your state's tax authority website or ask your tax software which important date explore to you.

If you moved during the year or worked in multiple states, you may owe tax to more than one state, each with its own important date. Multistate filers should verify each state's important date before April 15 to avoid missing a important date in a state where they earned income.

What to do if you cannot file by the important date

If you realize you cannot meet the important date, file Form 4868 before April 15. This is the fastest way to protect yourself from penalties. You can file it online through the IRS website, through tax software, or by mailing it to the IRS address listed in the form instructions.

If you have already missed April 15 and did not file an extension, file your return as soon as possible. The sooner you file, the sooner the penalty clock stops accruing. If you owe tax, include payment with your return to minimize interest charges. The IRS will calculate penalties and interest and send you a bill if you underpay.

If you cannot pay the full amount you owe, the IRS offers payment plans and other options. You can set up a payment plan through the IRS website, through your tax software, or by calling the IRS directly. Setting up a plan does not eliminate penalties and interest, but it stops the IRS from taking collection action while you pay.

Frequently Asked Questions

What if April 15 falls on a Saturday or Sunday?

The important date automatically moves to the next business day. If April 15 is a Saturday, you have until Monday, April 17. If it is a Sunday, you have until Monday, April 16. The IRS announces the exact important date each year in January or February.

Can I file my taxes early?

Yes. You can file as soon as you have all your documents — usually starting in late January or early February. Filing early does not trigger any penalties or problems. If you are due a refund, filing early means you receive it sooner.

Do I have to file taxes if I did not earn much income?

It depends on how much you earned and your filing status. The IRS sets a minimum income threshold each year below which you do not have to file. However, if you had taxes withheld from paychecks or made estimated payments, you should file to get a refund even if you are below the threshold.

What if I filed late but did not know about the important date?

The IRS can waive penalties in some cases if you show reasonable cause — meaning you made a good-faith effort to file on time but had circumstances beyond your control. You must request the waiver in writing and explain why you filed late. Not knowing the important date is rarely accepted as reasonable cause, but other circumstances (illness, death in the family, natural disaster) may may have access to.

Does an extension give me more time to pay taxes I owe?

No. An extension moves your filing important date to October 15, but your payment important date stays April 15. You must pay any tax you owe by April 15 to avoid interest and penalties, even if you file an extension and submit your return in October.