Tax Extension Deadline 2027: Friday, October 15, 2027
The tax extension deadline for 2026 returns is Friday, October 15, 2027 for most people, six months after the April 15, 2027 filing deadline. The IRS says an extension is only for filing the return, so any tax owed is still due April 15, 2027.
Maintained by Archie Chang · Sources checked against IRS and statute text on November 1, 2026 · Methodology & sources
How the extension date is set
The tax code lets the IRS grant an extension and caps it:
“The Secretary may grant a reasonable extension of time for filing any return, declaration, statement, or other document required by this title or by regulations. Except in the case of taxpayers who are abroad, no such extension shall be for more than 6 months.”
The IRS uses 6 months for Form 4868 and measures it from the return’s due date:
“Generally, we can’t extend the due date of your return for more than 6 months (October 15, 2026, for most calendar year taxpayers). However, there may be an exception if you’re living out of the country. See Pub. 54 for more information.”
For a 2025 return that form gives April 15, 2026 and October 15, 2026. For 2026 returns the due date is April 15, 2027, so six months later is Friday, October 15, 2027. The IRS’s Individual tax filing page, last reviewed October 30, 2026, tells filers to get an extension to October 15, and the IRS’s draft 2027 Publication 509 says:
“Then, file Form 1040 or Form 1040-SR by October 15.”
26 U.S.C. 7503 counts any authorized extension of time in finding the last day for an act, so a last day that lands on a weekend or a District of Columbia legal holiday moves to the next day that is not one. The check for 2027, which is our computation:
- April 15, 2027 plus 6 months is October 15, 2027.
- October 15, 2027 is a Friday (calendar), so not a weekend day.
- The IRS draft 2027 Publication 509 lists Monday, October 11 as the only October legal holiday, so October 15 is not a holiday.
- Result: Friday, October 15, 2027.
Extension deadline by year
| Return for tax year | Filing deadline | Extension runs to | Source |
|---|---|---|---|
| 2022 | Tuesday, April 18, 2023 | Monday, October 16, 2023 | IRS Publication 509 (2023), “by October 16”; IR-2023-05 |
| 2023 | Monday, April 15, 2024 | Tuesday, October 15, 2024 | IRS Publication 509 (2024), “by October 15”; the year comes from the calendar |
| 2024 | Tuesday, April 15, 2025 | Wednesday, October 15, 2025 | IRS Publication 509 (2025), “by October 15”; the year comes from the calendar |
| 2025 | Wednesday, April 15, 2026 | Thursday, October 15, 2026 | IRS Publication 509 (2026), “by October 15”; the year comes from the calendar |
| 2026 | Thursday, April 15, 2027 | Friday, October 15, 2027 | IRS Form 4868 rule and draft 2027 Publication 509; our calendar computation |
| 2027 | Tuesday, April 18, 2028 | Monday, October 16, 2028 | Our computation, not an IRS date |
In 2023 the date was October 16 because October 15, 2023 was a Sunday (calendar); IR-2023-05 says taxpayers requesting an extension had until “Monday, October 16, 2023”. See tax deadline 2027 for the filing date and its check.
An extension to file is not an extension to pay
The IRS’s extension page says to pay any tax owed by the April filing date and that the extension is only for filing the return. The Form 4868 instructions say:
“Although you aren’t required to make a payment of the tax you estimate as due, Form 4868 doesn’t extend the time to pay taxes. If you don’t pay the amount due by the due date, you’ll owe interest. You may also be charged penalties.”
The IRS’s interest page adds when interest starts:
“In general, we charge interest on underpayments starting on the due date of the amount you owe and will continue to accrue until the balance is paid in full:
Tax is due on the return filing date; extensions to file do not extend the date for payment of the tax.”
Owing tax by April 15, 2027 and unable to pay it all? The IRS payment plan calculator estimates the cost of a short-term or long-term plan, and the underpayment penalty calculator covers the estimated tax penalty, which is a different penalty.
Penalties and interest, as the IRS states them
| Charge | Rate and limit | Counted from | IRS source |
|---|---|---|---|
| Failure to file penalty | 5% of the tax due (less tax paid on time and available credits) for each month or partial month the return is late, up to 25%; not charged if you show reasonable cause | The due date including extensions: October 15, 2027 with a valid extension | IRS failure to file penalty page; Form 4868 instructions |
| Failure to pay penalty | 0.5% of the unpaid taxes for each month or part of a month, up to 25%; 0.25% a month during an approved payment plan if you filed on time as an individual; 1% a month if you do not pay within 10 days after a notice of intent to levy | The due date of the return, April 15, 2027 | IRS failure to pay penalty page; Form 4868 instructions |
| Both apply in one month | The failure to file penalty is reduced by the failure to pay penalty: 4.5% plus 0.5%, not 5% plus 0.5% | Each month both apply | IRS failure to pay penalty page |
| Interest on unpaid tax | Rates vary and may change quarterly; interest accrues daily. Interest on penalties starts on other dates; see the IRS interest page | The date the tax was due, April 15, 2027 | IRS interest page |
Which date each charge uses
The failure to file penalty counts from the extended due date, October 15, 2027, if you have a valid extension. The Form 4868 instructions say:
“A late filing penalty is usually charged if your return is filed after the due date (including extensions).”
The failure to pay penalty and interest run from April 15, 2027, because the tax was due then. For taxpayers who file late, there is a minimum failure to file penalty, and the IRS counts the 60 days with regard to any extension:
“In the case of any return required to be filed in 2027, the amount of the addition to tax under § 6651(a) for failure to file an income tax return within 60 days of the due date of such return (determined with regard to any extensions of time for filing) will not be less than the lesser of $535 or 100 percent of the amount required to be shown as tax on such return.”
| Return | Minimum failure to file penalty | Source |
|---|---|---|
| Required to be filed in 2027 (tax year 2026, this page’s returns) | The lesser of $535 or 100 percent of the amount required to be shown as tax | Revenue Procedure 2025-32, section 4.52 |
| Row “After 12/31/2025” of the IRS failure to file penalty page | $525.00 (row “After 12/31/2025”). When we checked on November 1, 2026, that was the page’s last row and it had no separate row for returns due in 2027; for 2027 returns this page uses the Revenue Procedure above. | IRS failure to file penalty page, captured November 1, 2026 |
For the late payment penalty, the IRS says you are considered to have reasonable cause for the period covered by the automatic extension if at least 90% of the total tax is paid by the due date of your return and the remaining balance is paid with your return. The rates change, so read the IRS’s own pages for the current figures: failure to file penalty, failure to pay penalty and interest.
Ways to get an extension
The IRS lists these ways to get until October 15:
“There are 3 ways to get until October 15 to file your tax return.
Pay online and check the box
Pay what you owe using an online payment option and check the box that you are paying as part of filing for an extension. You don’t have to file a separate extension form and you’ll receive a confirmation number of your extension for your records.”
- Use IRS Free File to electronically request an automatic tax-filing extension; the IRS says there is no income limit for extensions.
- File Form 4868 by mail, online with an IRS e-filing partner or through a tax professional.
- You do not have to explain why you are asking, and the IRS says it will contact you only if your request is denied.
- The IRS says not to file Form 4868 if you want the IRS to figure your tax or you are under a court order to file by the due date.
Request it by the April due date, April 15, 2027. See the IRS extension page and the Form 4868 instructions.
Special cases
Taxpayers abroad
“If, on the due date of your return, you’re out of the country (as defined below) and a U.S. citizen or resident, you’re allowed 2 extra months to file your return and pay any amount due without requesting an extension. Interest will still be charged, however, on payments made after the due date, without regard to the extension.”
Two months after April 15, 2027 is Tuesday, June 15, 2027, our computation from that rule; the IRS form prints June 15, 2026 for 2025 returns. Form 4868 can add 4 more months for these taxpayers.
Combat zone service
“Special rules may apply if you served or are serving in the Armed Forces in a combat zone or a contingency operation or become hospitalized from an injury while serving. You have at least 180 days after you leave the designated combat zone/contingency operation to file and pay taxes.”
Disaster areas
“If a disaster affected you
You may have more time to file if you were affected by a disaster situation.”
The IRS names the places and the new dates in each announcement; see its tax relief in disaster situations page. This page names no specific postponement.
The same set: Tax Deadline 2027 and When Does Tax Season Start 2027.
Frequently asked questions
What is the tax extension deadline for 2027?
For tax year 2026 returns the extension ends Friday, October 15, 2027 for most people. Form 4868 gives an automatic 6 months, and the IRS says a request is due by the April tax filing due date, April 15, 2027. This date is our computation; the IRS’s Individual tax filing page, last reviewed October 30, 2026, says: “Get an extension to October 15 to file your taxes.”
Does an extension give me more time to pay?
No. The IRS says Form 4868 does not extend the time to pay taxes, and that if you do not pay the amount due by the due date you will owe interest and may also be charged penalties. The extension is only for filing your return. Tax is due April 15, 2027 either way.
How much is the penalty if I file late after an extension?
The IRS says the failure to file penalty is 5% of the tax due, less any tax paid on time and available credits, for each month or partial month the return is late, up to a maximum of 25%. With an extension the penalty counts from the extended due date, October 15, 2027. If the return is more than 60 days late, counted with regard to any extension, Revenue Procedure 2025-32 (section 4.52) sets the minimum at the lesser of $535 or 100 percent of the amount required to be shown as tax, for returns required to be filed in 2027. The IRS says the penalty does not apply if you can show the failure was due to reasonable cause.
What is the penalty if I owe tax and filed an extension?
The failure to pay penalty and interest run from April 15, 2027, not from the extended date. The IRS says the failure to pay penalty is 0.5% of the unpaid taxes for each month or part of a month the tax remains unpaid, and it will not exceed 25%. The Form 4868 instructions say you are considered to have reasonable cause for the period covered by the extension if at least 90% of the total tax is paid by the due date and the remaining balance is paid with your return.
How do I request a tax extension?
The IRS lists 3 ways to get until October 15: pay what you owe using an online payment option and check the box that you are paying as part of filing for an extension, use IRS Free File to request an automatic extension (no income limit for extensions), or file Form 4868 by mail, online with an IRS e-filing partner or through a tax professional. You do not have to explain why you are asking, and the IRS says it will contact you only if your request is denied.
What if I live outside the United States?
The IRS says that if you are a U.S. citizen or resident out of the country on the due date you are allowed 2 extra months to file and pay without requesting an extension, and interest is still charged. For 2026 returns that is Tuesday, June 15, 2027, our computation. Form 4868 can add 4 more months, and the IRS says there may be an exception beyond 6 months for people living out of the country; see Publication 54.
What if I was in a combat zone or a disaster area?
The IRS says special rules may apply if you served in a combat zone or a contingency operation, with at least 180 days after you leave the designated area to file and pay taxes. For disasters, the IRS says you may have more time to file if you were affected by a disaster situation, and the IRS names the places and dates in each announcement.
Was the extension deadline always October 15?
In 2024, 2025 and 2026 yes. In 2023 it was Monday, October 16, because October 15, 2023 was a Sunday, and the IRS’s 2023 Publication 509 and IR-2023-05 give that date.
Related tax pages
See estimated tax due dates for the payments due during the year, and the tax refund schedule for refund timing.
Sources (checked November 1, 2026): IRS: Individual tax filing · IRS: Get an extension to file your tax return · IRS: Form 4868 and instructions (2025) · IRS: When to file · 26 U.S.C. 6081: extension of time for filing returns · 26 U.S.C. 6081: extension of time for filing returns (Cornell LII copy) · 26 U.S.C. 7503: time for performance of acts where last day falls on Saturday, Sunday, or legal holiday · 26 U.S.C. 7503: time for performance of acts where last day falls on Saturday, Sunday, or legal holiday (Cornell LII copy) · IRS: Failure to file penalty · IRS: Failure to pay penalty · IRS: Interest · IRS: Revenue Procedure 2025-32 · IRS: draft 2027 Publication 509, Tax Calendars · IRS: 2026 Publication 509, Tax Calendars · IRS: 2025 Publication 509, Tax Calendars · IRS: 2024 Publication 509, Tax Calendars · IRS: 2023 Publication 509, Tax Calendars · IRS: news release IR-2023-05, IRS sets January 23 as official start to 2023 tax filing season · IRS: Tax relief in disaster situations