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Last reviewed: September 28, 2026
Extended 2025 federal returns are due Thursday, October 15, 2026: Form 1040, 1040-SR and 1040-NR returns extended with Form 4868, and calendar-year C corporation Form 1120 returns extended with Form 7004. There is no second extension for most filers, so a return filed after October 15 owes a failure-to-file penalty of 5% of the unpaid tax per month (maximum 25%, minimum $525 once it is more than 60 days late) on top of the 0.5% monthly late-payment penalty and daily interest (7% a year in the fourth quarter) that have been running since April 15. Taxpayers in 2026 IRS disaster areas, U.S. citizens living abroad and some nonresident filers have later dates, listed below.
Key takeaways:
The tax extension deadline for 2026 depends on the return. October 15 covers individual and C corporation income tax returns; business returns that pass income through to owners had earlier dates.
| Return | Who files | Extension | Extended due date |
|---|---|---|---|
| Form 1040, 1040-SR, and 1040-NR with U.S. wages | Individuals, including sole proprietors and single-member LLCs | Form 4868 | Thursday, October 15, 2026 |
| Form 1120 (calendar year) | C corporations | Form 7004 | Thursday, October 15, 2026 |
| Form 709 | Donors filing a 2025 gift tax return | Automatic with Form 4868 (or Form 8892) | Thursday, October 15, 2026 |
| FinCEN Form 114 (FBAR) | U.S. persons whose foreign accounts topped $10,000 in aggregate | Automatic, no request | Thursday, October 15, 2026 |
| Form 5500 / 5500-EZ (2025 calendar plan year) | Plan sponsors, including solo 401(k)s with $250,000+ in assets | Form 5558, or automatic with the employer's return extension | Thursday, October 15, 2026 |
| Form 1065, Form 1120-S | Partnerships and S corporations | Form 7004 | Tuesday, September 15, 2026 (passed) |
| Form 1041 | Trusts and estates | Form 7004 (5½ months) | Wednesday, September 30, 2026 |
| Form 990 series (calendar year) | Tax-exempt organizations | Form 8868 | Monday, November 16, 2026 |
| Form 1040-NR (no U.S. wage withholding) | Nonresident aliens | Form 4868 | Tuesday, December 15, 2026 |
Business returns on extension: partnerships and S corporations had until September 15, 2026, and trusts and estates get only 5½ months, which puts their extended returns on September 30, 2026. The partnership tax deadline guide and the trust and estate tax deadline guide cover the late-filing penalties for those returns.
The extension request deadline for all of these was in the spring. The step-by-step guide to filing Form 4868 and Form 7004 walks through how the extension itself works, which matters again when you plan for the 2027 season.
Legal basis: IRC §6081 (extension of time for filing), IRC §6651 (failure to file / failure to pay penalties), IRC §6601 (interest on underpayment)
Save this cheat sheet: the October 15 returns, the other extended dates, and the penalty rates in one image.
October 15 is the extended deadline for individual and C corporation income tax returns. Several related filings and retirement contributions share the date, and two nearby deadlines are easy to confuse with it: extended trusts and estates (September 30) and calendar-year nonprofits (November 16).
The Form 1040 extension deadline in 2026 is October 15. Anyone who filed Form 4868 by April 15, 2026, or made a payment designated as an extension payment, has until then to submit the completed 2025 Form 1040, 1040-SR or 1040-NR. That group includes sole proprietors and single-member LLC owners, whose Schedule C and Schedule SE go in with the return.
Three details from the Form 4868 instructions matter at this stage:
IRS Free File guided software stays open through October 15, 2026 for taxpayers with 2025 adjusted gross income of $89,000 or less, and taxpayers above that limit can use Free File Fillable Forms (IR-2026-101).
The Form 1120 extension due date in 2026 is October 15 for calendar-year C corporations that filed Form 7004 by April 15, 2026. Fiscal-year corporations add six months to their own original due date, except June 30 year-ends whose tax year began before 2026, which get seven. The C-corp tax deadline guide lists the fiscal-year dates.
A C corporation that misses October 15 owes the same §6651 penalties as an individual: 5% of the unpaid tax per month up to 25%, at least $525 (or 100% of the tax, if less) once the return is more than 60 days late, and 0.5% a month for late payment. Partnerships and S corporations that missed September 15 face a different penalty: $255 per partner or shareholder for each month the return is late, up to 12 months, for returns due in 2026 (Rev. Proc. 2024-40).
Four more obligations share the October 15, 2026 date:
Extended Form 1041 returns have an earlier deadline: the Form 1041 extension due date in 2026 is September 30. Form 7004 grants trusts and estates a 5½-month extension from the April 15 due date, per the Form 7004 instructions, so a fiduciary who assumes the individual October 15 date files 15 days late and picks up a full month of failure-to-file penalty (5% of the unpaid tax).
Calendar-year nonprofits that filed Form 8868 by May 15, 2026 have until November 16, 2026 to file Form 990 (the 6-month extension lands on Sunday, November 15, so the deadline shifts to Monday). Organizations with fiscal year-ends count 6 months from their own original date; some land on or near October 15. Verify your organization's dates in IRS Publication 509.
You have an October 15 deadline if you fall into one of these categories:
Individuals who filed Form 4868. This includes anyone who requested an automatic 6-month extension of their individual return. You didn't need a reason: Form 4868 grants the extension automatically as long as it was filed (or postmarked) by April 15.
C-Corporations that filed Form 7004. Calendar-year C-Corps that requested an automatic 6-month extension of their corporate return.
Anyone who made a payment designated as an extension payment. If you made a tax payment by April 15 and indicated it was an extension payment, the IRS treats that as an automatic extension request, even without filing Form 4868 separately.
Missing October 15 triggers two separate penalties plus interest, unless the IRS's new automatic exemption covers you. Here's exactly how each one works.
Rate: 5% of unpaid tax per month (or partial month) the return is late Maximum: 25% of unpaid tax Legal basis: IRC §6651(a)(1)
This is the big one. The late filing penalty is assessed for each month or fraction of a month that the return is late after October 15. If you file on October 20, that counts as one month. File on November 20, that's two months.
Minimum penalty for returns more than 60 days late: The lesser of $525 or 100% of the unpaid tax. The $525 figure applies to returns required to be filed in 2026, per Rev. Proc. 2024-40 and the IRS failure-to-file penalty page, and the 60 days count from the extended due date. For an extended 2025 return, that means a return filed on or after December 15, 2026. The minimum applies even if you owe very little: if your unpaid tax is $200 and you're more than 60 days late, the penalty equals your entire tax bill.
Rate: 0.5% of unpaid tax per month (or partial month) Maximum: 25% of unpaid tax Legal basis: IRC §6651(a)(2)
This penalty has been running since April 15, 2026, not since October 15. The extension extended your filing deadline, not your payment deadline. If you owed $5,000 and didn't pay by April 15, you've been accumulating 0.5% per month ($25/month) in late payment penalties since then, unless you paid at least 90% by April 15 and settle the rest with a return filed by October 15.
Key fact: The failure-to-file penalty is 10 times the failure-to-pay penalty. Filing late costs 5% per month; paying late costs 0.5% per month. This means it's always better to file on time (or as close to it as possible), even if you can't pay the full amount.
When both penalties apply simultaneously, the late filing penalty is reduced by the late payment penalty for any month where both are charged. The combined maximum is still 5% per month for the first five months, then 0.5% per month after that. Total maximum: 47.5% of unpaid tax (25% filing + 25% payment, minus the overlap during the first five months).
Rate: Federal short-term rate + 3 percentage points, compounded daily. For the fourth quarter of 2026 (October through December), the underpayment rate is 7%, unchanged from the third quarter, per the IRS quarterly interest rates (it was 6% in Q2 and 7% in Q1). Legal basis: IRC §6601
Interest accrues from the original due date (April 15) on any unpaid tax, and it compounds daily. Unlike penalties, there's no maximum cap on interest; it runs until the balance is paid in full.
Say you owed $10,000 in tax and filed Form 4868 in April but didn't make a payment. You file your return and pay in full on December 15, 2026, two months after the October 15 extended deadline, and no penalty relief applies.
Filing and paying on October 15 instead would have cost $300 in late-payment penalty plus about $335 of interest, roughly $635. The two-month delay adds about $1,120, most of it the $900 late-filing penalty. Run your own dates through the IRS penalty and interest calculator to see what filing this week versus next month costs.
The IRS's Automatic Exemption from Penalty (AEP), announced July 8, 2026 in IR-2026-83, covers 2025 Form 1040, 1065 and 1120 returns processed after it began this summer. If you filed the same type of return on time for the three prior years (2022 through 2024 for a 2025 return) and no penalties were assessed in those years, with an estimated-tax penalty not counting against you, the IRS doesn't assess the failure-to-file or failure-to-pay penalty on a late 2025 return. You receive a notice saying so and don't need to call or file anything; interest on unpaid tax still runs.
AEP has two limits worth knowing before you count on it. A late 2025 return breaks the three-year record, so AEP won't cover a late 2026, 2027 or 2028 return. And AEP doesn't apply to event-based returns such as Form 709. Taxpayers who don't qualify can request reasonable-cause relief; for 2024 and earlier years, the older First Time Abate still applies, but you have to request it by phone or with Form 843 for penalty abatement.
No, not for most filers. Form 4868 grants one automatic six-month extension, and the IRS has no second extension form for individual or corporate income tax returns, so October 15, 2026 is final unless one of the exceptions below applies.
If a document is still missing, file by October 15 with the best information available and correct the return later with an amended return (Form 1040-X).
The IRS has postponed the October 15, 2026 deadline for extended 2025 returns in the areas covered by its 2026 disaster declarations. As of September 28, 2026, the IRS disaster relief list shows two postponed dates:
| Postponed to | Covered areas (see each IRS announcement for the full county list) |
|---|---|
| February 1, 2027 | Hawaii County, HI (earthquake); 21 Indiana counties (August storms); Chelan, Douglas, Ferry, Okanogan, Spokane, Stevens and Yakima counties, WA, plus the Colville, Spokane and Yakama tribal areas (wildfires); 8 southern Mississippi counties (Tropical Storm Arthur); parts of Nebraska (five spring and summer wildfire and storm declarations); Lewis, Pleasants, Ritchie and Upshur counties, WV; Rota, Saipan and Tinian, Northern Mariana Islands (Super Typhoon Bavi); Oglala Sioux Tribe, SD |
| November 2, 2026 | 37 Michigan counties; 21 Wisconsin counties and the Oneida Reservation; Franklin, Lamar, Lawrence, Lincoln and Wilkinson counties, MS; 9 Louisiana parishes (Tropical Storm Arthur); Northern Islands, Rota, Saipan and Tinian, Northern Mariana Islands (Super Typhoon Sinlaku) |
The relief is automatic for taxpayers whose address of record is in a covered area; others whose records are there can call the IRS disaster hotline at 866-562-5227. Where the disaster began after April 15, 2026, only the filing date moves: the 2025 tax was still due April 15, so interest and the late-payment penalty run from that date. The IRS adds areas as new federal declarations come in, so check the list before assuming October 15 applies to you.
Taxpayers living and working outside the United States can request a discretionary extension to December 15, 2026 by sending the IRS a letter before October 15 that explains why they need the extra two months (Publication 54). The IRS responds only if it denies the request, and the option isn't available to anyone with an approved Form 2350 extension.
Deadlines for service members in a combat zone are extended for the time served there plus 180 days after leaving, and the IRS charges no interest or penalties for that period (Publication 3).
C-Corporations cannot get a second extension beyond October 15 either. A corporation located in one of the disaster areas above gets the same automatic postponement as individuals there.
If you paid at least 100% of your tax liability by April 15, there is no late filing penalty and no late payment penalty for filing after the original deadline, even without an extension.
The penalties under IRC §6651 are calculated as a percentage of the unpaid tax. If there's no unpaid tax, the penalty is zero. The IRS cannot charge 5% of $0.
So if you overpaid your estimated taxes or had enough withholding to cover your full liability, you technically face no penalty for filing late. But you should still file your return for two important reasons:
The statute of limitations doesn't start until you file. The IRS generally has 3 years from the date you file to audit your return (IRC §6501). If you never file, there's no statute of limitations: the IRS can audit you indefinitely.
You can't get your refund. If you overpaid, you're owed a refund. But you must file a return to claim it, and you have only 3 years from the original due date to do so.
If you missed the April 15 original deadline and didn't file Form 4868, your situation is different from someone who extended but missed October 15. Without an extension, the late filing penalty started running from April 16, and by mid-September 2026 it reached its cap: five months at 4.5% net of the payment penalty, or 22.5% of the unpaid tax.
But here's what matters: it is always better to file late than not to file at all.
Once the late filing penalty is capped, what keeps growing is the 0.5% monthly late payment penalty and daily interest, and both stop only when you pay. Filing still matters: it starts the statute of limitations, ends the risk of the IRS preparing a substitute return without your deductions, and makes you eligible for a payment plan.
The minimum penalty of $525 (or 100% of tax owed, whichever is less) applies to returns filed more than 60 days late. If you owe $300, your penalty is $300, not $525. But even small balances face meaningful penalties once you cross the 60-day mark.
For a detailed guide on filing late, see What Happens If You Don't File Taxes. If you have unfiled returns from prior years, the guide to filing back taxes covers how far back to go and how to rebuild missing years.
Under IRC §6501, the IRS has 3 years from the date you file your return to initiate an audit (called an "assessment"). This 3-year clock starts on the later of: the date you actually file, or the original due date of the return.
If you file before the due date (say, you file your 2025 return in February 2026), the 3-year period starts from April 15, 2026, not your actual filing date.
But here's the critical point: if you never file a return, the statute of limitations never starts. The IRS can come back 5, 10, or 20 years later and assess tax on an unfiled return. There is no time limit.
There are also exceptions that extend the standard 3-year period:
This is why filing matters even if you owe nothing or are owed a refund. Filing starts the clock. Not filing leaves it open indefinitely.
This is the single most expensive misunderstanding in the tax extension system. Form 4868 extends your filing deadline to October 15. Your payment deadline was still April 15. If you owe tax and didn't pay by April 15, you've been accruing late payment penalties (0.5%/month) and interest since then, regardless of your extension.
What to do: If you owe and haven't paid, pay as much as possible now. The penalty and interest stop accruing on the date you pay, not the date you file.
Some people think that since they missed the extended deadline, there's no point in filing. This is wrong and costly. The late filing penalty (5%/month) continues to accrue each month you don't file, up to the 25% maximum. Filing now, even in November or December, stops the bleeding.
File as soon as possible. If you can't afford to pay, file the return anyway and set up a payment plan: a balance of $50,000 or less qualifies for an IRS Simple Payment Plan with no financial statement, and the setup fee is $29 online with direct debit ($178 by phone or mail without it). The Form 9465 installment agreement guide covers the application. The late filing penalty is 10 times worse than the late payment penalty.
Most states follow the federal October 15 extended deadline for individual returns, but not all. Some states have their own extension rules, different automatic extension periods, or require you to file a separate state extension form. Don't assume your state deadline matches the federal one.
Check your state's tax authority website for the specific extended deadline and any separate filing requirements.
The IRS does not send reminder notices before the October 15 deadline. You won't get a letter, email, or phone call telling you that your extended return is due. The responsibility is entirely on you. By the time you hear from the IRS, it will be a penalty notice, not a reminder.
Set your own reminders. Put October 15 on your calendar with alerts at 30 days, 14 days, and 3 days before the deadline. Use the tax deadline calendar to track all your dates.
If you extended in April, the hard part of October is reconstructing nine months of finances. Jupid does that continuously: connect your bank accounts and it categorizes income and expenses with 95.9% accuracy, so your Schedule C numbers are organized before you sit down to file. Ask the AI accountant in WhatsApp or iMessage "How much did my business earn in 2025?" and get an answer from your real transaction data in real time, not a guess from memory. Try Jupid.
October 15 is the last stop for millions of taxpayers who extended their returns. Unlike April 15, there's no second extension available: this is the final deadline outside the disaster areas and the special cases above. If you filed Form 4868 or Form 7004, your return needs to be submitted by this date or penalties start stacking on top of any interest that's already been accruing.
The math is straightforward: filing on time (even if you can't pay in full) is always cheaper than filing late. The late filing penalty runs at 5% per month. The late payment penalty runs at 0.5% per month. Filing your return and requesting a payment plan costs a fraction of what the combined penalties would.
If you're reading this and October 15 is approaching, stop putting it off. Gather your documents, calculate what you owe, and file. If October 15 has already passed, file today. Every additional day adds to the cost.
Disclaimer
This article provides general information about the October 15, 2026 extended tax filing deadline and should not be considered tax advice. Penalty calculations, interest rates, and specific deadlines may vary based on individual circumstances, entity type, fiscal year-end, and state of residence. The IRS may adjust interest rates quarterly and may grant relief in certain disaster situations. For advice specific to your situation, consult a qualified tax professional or refer to IRS Publication 509 for the official tax calendar.
Last Updated: September 28, 2026
CEO & Co-Founder
Fintech CEO with 10+ years building accounting and financial technology products. Previously co-founded and scaled an AI-powered accounting platform to $30M revenue and 100K+ business users, achieving 30,000 customers per accountant through automation — recognized by CNBC as a top fintech company. Holds a Master's in Management Information Systems. At Jupid, he leads the development of AI-native bookkeeping, tax, and compliance tools designed for freelancers and small business owners.
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