The IRS extension important date for 2024 returns is October 15, 2024

If you filed Form 4868 to extend your 2024 tax return, your new important date to file is October 15, 2024. This is six months past the normal April 15 important date. The extension gives you more time to file, but it does not give you more time to pay taxes you owe — those were due on April 15 whether you filed or not.

The October 15 date applies to most individual filers. If you live outside the United States or are in the military, you may have already had an automatic two-month extension to June 15, which means your October 15 important date is actually an additional extension beyond that. Self-employed people and business owners who filed extensions have the same October 15 important date for their individual returns, though business returns (like partnership or S-corp returns) follow different schedules.

Missing the October 15 important date means the IRS will treat your return as late, even though you filed an extension. Late filing penalties and interest on unpaid tax will explore from April 15 forward.

Key Takeaways

  • The extension important date for 2024 individual tax returns is October 15, 2024, which is six months after the normal April 15 important date.
  • Filing an extension does not extend the important date to pay taxes owed; taxes were due April 15 even if you did not file by then.
  • If you owe tax and did not pay by April 15, interest and penalties have been running since that date, whether or not you filed an extension.
  • Missing the October 15 important date triggers late-filing penalties on top of any tax owed, so filing before that date matters even if you cannot pay in full.

What happens if you miss October 15

If your return is not filed by October 15, 2024, the IRS will assess a failure-to-file penalty. This penalty is typically 5% of the unpaid tax for each month (or part of a month) that the return is late, up to a maximum of 25%. The penalty clock started on April 15 if you did not file by then, so by October 15 you are already six months behind.

You will also owe interest on any unpaid tax from April 15 forward. The interest rate is set by the IRS quarterly and compounds daily. As of 2024, the rate is 8% per year, though this changes. Interest accrues whether you file on time or late, so the longer you wait, the more you owe.

If you file after October 15 but before the IRS contacts you, you still face both penalties and interest. If the IRS initiates contact first — through a notice or audit — the penalties and interest are the same, but you may also face additional scrutiny of your return.

Paying tax you owe before October 15

You do not have to wait until October 15 to pay. In fact, paying before you file can reduce the interest that accrues. If you owe $5,000 and you pay it in June, you will owe less interest by October 15 than if you wait to pay until you file in October.

You can pay through the IRS website using Direct Pay, a debit or credit card, or an electronic federal tax payment system (EFTPS) account. You can also mail a check with a payment voucher. When you pay before filing, keep a record of the payment — the confirmation number, the date, and the amount. This proof matters if there is a discrepancy later.

If you cannot pay the full amount by October 15, file your return anyway. Filing on time stops the failure-to-file penalty; you will still owe the failure-to-pay penalty (0.5% per month) and interest on the unpaid balance, but that is less than the combined penalties you face if you do not file at all.

Who got an automatic extension and who did not

Most people who filed Form 4868 by April 15, 2024, received a six-month extension to October 15. However, some filers received an automatic two-month extension to June 15 without filing Form 4868. This applies to U.S. citizens and residents who live outside the United States and to members of the military serving outside the U.S. If you fall into either category, your October 15 important date is actually a second extension — you had until June 15 first.

If you live outside the U.S. and filed Form 4868 by June 15, your important date is October 15. If you did not file the form by June 15, you do not have the extension and your return was due June 15.

Residents of Puerto Rico, Guam, the U.S. Virgin Islands, and American Samoa have different rules depending on their bona fide residency status. If you are a bona fide resident of one of these territories, you may file under that territory's tax system instead of the federal system. Check with the territory's tax authority for important date.

Business returns and partnership important date

If you own a business or are a partner in a partnership, your individual return important date is still October 15, 2024. However, your business or partnership return may have a different important date. S-corporations and partnerships typically have a March 15 important date (or six months after year-end if your year does not end December 31), and extensions push that to September 15. C-corporations have a different schedule altogether.

If your business return is not filed by its important date, you cannot file your individual return showing business income until the business return is filed. This can create a cascade of late filings. If you own a business and extended, confirm the important date for your business entity separately — it is not the same as October 15.

What to do if you cannot file by October 15

If October 15 is approaching and you are not ready, file your return anyway, even if it is incomplete or you owe money you cannot pay. Filing stops the failure-to-file penalty and shows the IRS you are complying. You can amend the return later if needed.

If you realize you need more time after October 15 has passed, you can still file. The penalties and interest will be larger, but filing is still better than not filing. The IRS does not grant extensions beyond October 15 for individual returns except in rare cases of disaster or hardship — and those require written request and approval, not automatic.

If you owe tax and cannot pay, the IRS offers payment plans. You can set up an installment agreement online through the IRS website, by phone, or by mail. Short-term plans (120 days or less) have no setup fee; longer plans charge a fee. Interest and penalties continue to accrue on the unpaid balance, but a payment plan stops the failure-to-pay penalty from growing.

Frequently Asked Questions

Can I file my 2024 return after October 15 if I did not file an extension?

Yes, you can file late, but you will owe failure-to-file and failure-to-pay penalties plus interest from April 15. The failure-to-file penalty is 5% per month up to 25%. Filing late is better than not filing at all, but it costs more than filing on time or by October 15.

Does filing an extension mean I do not owe tax until October 15?

No. Tax was due April 15 whether you filed or not. An extension only extends the important date to file your return, not to pay. If you owed tax and did not pay by April 15, interest has been running since then.

What if October 15 falls on a weekend or holiday?

If October 15 is a Saturday, Sunday, or federal holiday, the important date moves to the next business day. In 2024, October 15 is a Tuesday, so the important date is October 15. Check the IRS website if you are unsure whether a particular date is a holiday.

Can I get an extension beyond October 15?

The IRS does not grant routine extensions beyond October 15 for individual returns. You would need to show unusual hardship or circumstances beyond your control, and you would have to request it in writing before October 15. Most requests are denied.

If I file my return by October 15 but cannot pay the tax owed, what happens?

You will owe the failure-to-pay penalty (0.5% per month) and interest on the unpaid balance, but you will not owe the failure-to-file penalty. Filing on time is important even if you cannot pay in full. You can set up a payment plan with the IRS to pay over time.