If you got an extension on your 2025 federal tax return, you must file by Thursday, October 15, 2026. The extension only gave you more time to file, not to pay, so any unpaid tax has usually been building a 0.5%-a-month late-payment penalty plus interest since April 15. File by the deadline even if you can't pay in full: missing it triggers a late-filing penalty of up to 5% of the unpaid tax per month.
Key takeaways
- The extended deadline for 2025 federal returns is Thursday, October 15, 2026. The IRS generally can't extend a return more than six months, so most filers get no second extension.
- Filing late costs 5% of the unpaid tax per month, up to 25%. Past 60 days late, the minimum penalty is $525 or the tax due, whichever is smaller.
- Paying late costs 0.5% of the unpaid tax per month, up to 25%, plus interest at 7% a year (compounded daily) for October through December 2026.
- Can't pay? File anyway and apply for an IRS payment plan online. A short-term plan (180 days or less) has no setup fee.
- IRS Free File stays open through October 15, 2026 for people whose 2025 adjusted gross income was $89,000 or less.
If you asked the IRS for more time to file your 2025 federal income tax return this spring, that time is nearly up. The extended deadline is Thursday, October 15, 2026, and for most people it is final.
The date matters most if you still owe money. An extension, whether you filed Form 4868 or made an online payment marked as an extension, only bought time to file. The IRS’s April 2026 extension reminder (IR-2026-52) is clear that any tax owed was still due April 15.
When is the tax extension deadline in 2026?
| Date | What it means for 2025 returns |
|---|---|
| Wednesday, April 15, 2026 | Original filing deadline, last day to request an extension, and the deadline to pay any tax owed |
| Thursday, October 15, 2026 | Last day for extension filers to file without a late-filing penalty; last day to use IRS Free File |
| November 2026 (exact date announced later) | The IRS stops accepting e-filed returns for the season |
| Monday, December 14, 2026 | 60 days after October 15; a return filed after this date is more than 60 days late and faces a minimum penalty |
The Form 4868 instructions say the IRS generally can’t extend a return’s due date by more than six months, so most filers get no second extension. The main exception is for some people living abroad. Per the IRS e-file dates page, e-filing stays open into November, with the cutoff announced in late October or early November.
What happens if you miss the October 15 deadline?
Two separate penalties can apply, plus interest. The failure-to-file penalty is for a late return. The failure-to-pay penalty is for late payment, and for extension filers it has been running since April 15 on any unpaid balance.
| Failure-to-file penalty | Failure-to-pay penalty | |
|---|---|---|
| Starts | The day after October 15, 2026 (with a valid extension) | The day after April 15, 2026 |
| Rate | 5% of the tax not paid on time, per month or part of a month | 0.5% of the unpaid tax, per month or part of a month |
| Maximum | 25% | 25% |
| Special rules | Minimum of $525 or the tax due (whichever is smaller) if more than 60 days late | Drops to 0.25% a month with an approved payment plan if you filed on time; rises to 1% if unpaid 10 days after an IRS notice of intent to levy |
Sources: IRS failure-to-file and failure-to-pay penalty pages.
How the two penalties combine
When both penalties apply in the same month, the IRS reduces the failure-to-file penalty by that month’s failure-to-pay amount, so the two together cost 5% a month rather than 5.5%. The late-filing penalty maxes out after five months, while the late-payment penalty keeps going.
The minimum penalty for returns more than 60 days late is set by law, and the monthly offset can’t push the late-filing penalty below that floor (26 U.S.C. § 6651). For returns due in 2026, the IRS lists the minimum as $525.
The IRS also charges interest on both unpaid tax and penalties. For October through December 2026, the rate is 7% a year, compounded daily (IR-2026-98). The rate is reset every quarter. Unlike a penalty, interest is charged even if you had a good reason for paying late.
Example: what a $2,000 balance costs
Illustration only, based on the rules above. Jordan filed an extension in April, owes $2,000 for 2025 and has paid none of it. Jordan pays the full $2,000 on January 15, 2027, three months after the filing deadline.
If Jordan files by October 15 and pays on January 15:
- Late-payment penalty: 9 months (April 15 to January 15) × 0.5% × $2,000 = $90
- Late-filing penalty: $0
- Total penalties: $90, plus interest
If Jordan both files and pays on January 15:
- Late-payment penalty: the same $90
- Late-filing penalty using the monthly formula: 3 months × 5% × $2,000 = $300, minus the $30 late-payment penalty for those same 3 months = $270
- But the return is more than 60 days late, so the minimum applies: the smaller of $525 or $2,000 = $525
- Total penalties: $615, plus interest on the tax and the penalties
Filing on time, even without the money, saves Jordan $525. File first, then deal with the payment.
What if you can’t pay what you owe?
File by October 15 anyway and pay whatever you can now. The IRS accepts payments through your IRS Online Account, Direct Pay, the Electronic Federal Tax Payment System (EFTPS), and debit or credit card.
For the rest, you can apply for a payment plan online:
- Short-term plan: pay in full within 180 days. You qualify online if you owe less than $100,000 in combined tax, penalties and interest. The setup fee is $0.
- Long-term plan (installment agreement): monthly payments; you can apply online if you owe $50,000 or less. Online setup costs $29 with direct debit (automatic withdrawals from your bank account) or $69 with other payment methods. By phone, mail or in person, it’s $107 or $178. Low-income applicants pay no fee for direct debit, or $43 otherwise, which may be reimbursed.
Interest and some penalties keep adding up on a plan. But if you filed on time, an approved plan cuts the late-payment penalty to 0.25% a month. A budget calculator can help you choose a monthly payment you can keep up with.
You may also qualify for penalty relief. Under the Form 4868 instructions, you’re considered to have reasonable cause for paying late during the extension period if you paid at least 90% of your total 2025 tax by April 15 and pay the rest with your return. The IRS first-time abate policy can also remove late-filing and late-payment penalties if you filed on time for the prior three years and had no penalties other than for estimated tax, among other requirements. Interest tied to a removed penalty is removed too.
Can you still get a refund if you never filed or extended?
Yes. The IRS says there’s no penalty for filing late if it owes you a refund; the penalties are figured on unpaid tax. But you must file to get the money, and you generally have three years from the return’s due date to claim it. After that, the refund goes to the U.S. Treasury; that window closed for 2022 returns on April 15, 2026 (IR-2026-37).
If you didn’t extend, still haven’t filed and owe tax, your deadline was April 15, so the late-filing penalty has likely already hit its five-month maximum. File and pay as soon as you can, because the late-payment penalty and interest keep growing until the balance is paid.
Does the deadline change if you live in a disaster area?
It can. After federally declared disasters, the IRS often postpones filing and payment deadlines for people in affected areas, which can push them past October 15. Check the IRS Tax Relief in Disaster Situations page for current announcements.
According to the IRS disaster FAQs, relief is coded automatically when your IRS address of record is in a covered county. If you live elsewhere but the records you need are in a covered area, call the IRS disaster hotline at 866-562-5227.
Can you still file for free?
Yes, until the deadline. IRS Free File remains available through October 15, 2026, with free guided software for people whose 2025 adjusted gross income was $89,000 or less. Above that, Free File Fillable Forms is available at any income level if you’re comfortable doing your own return.
What to do now
- Gather your documents, including W-2s, 1099s and the amount of any payment you made with your extension. That payment goes on Schedule 3, line 10 of Form 1040.
- Use Free File if your 2025 adjusted gross income was $89,000 or less.
- E-file by Thursday, October 15, and choose direct deposit if you’re getting a refund.
- Pay what you can through Direct Pay or your IRS Online Account.
- Apply for a payment plan online for any balance you can’t cover.
- Check the IRS disaster relief page if a federally declared disaster hit your area.
- Avoid a repeat next year. Run your 2026 numbers through the income tax calculator, or the self-employment tax calculator if you have freelance income, and adjust your withholding or estimated payments.
Frequently asked questions
Can I get another extension after October 15?
Generally, no. The IRS says it can't extend the due date of a return more than six months, which makes October 15, 2026 the final deadline for most people filing a 2025 return. Some taxpayers living outside the United States may qualify for more time. If the IRS has announced disaster relief for your area, your deadline may also be postponed, so check the IRS disaster relief page.
What is the penalty for filing taxes late after an extension?
The failure-to-file penalty is 5% of the tax you didn't pay on time for each month or part of a month the return is late, up to 25%. If a late-payment penalty applies in the same month, the late-filing penalty is reduced by that amount. For a return due in 2026 that is more than 60 days late, the minimum penalty is $525 or the tax due, whichever is smaller.
What happens if I can't pay my taxes by October 15?
File your return on time anyway and pay what you can, because the monthly late-filing penalty rate (5%) is 10 times the late-payment rate (0.5%). Then apply for an IRS payment plan online. Short-term plans of up to 180 days have no setup fee. Long-term plans cost $29 to set up online with automatic bank payments. Interest and some penalties keep adding up until the balance is paid.
Is there a penalty for filing late if I'm getting a refund?
No. The IRS says there is no penalty for filing after the deadline if it owes you a refund. The penalties are figured on unpaid tax, so with no balance due there is nothing to charge. You still have to file to get the money, though. You generally have three years from the return's due date to claim a refund, and after that the money goes to the U.S. Treasury.
Can I still use IRS Free File to file my 2025 return?
Yes, through October 15, 2026. IRS Free File offers free guided tax software to people whose 2025 adjusted gross income was $89,000 or less. If you earned more, Free File Fillable Forms, a set of electronic IRS forms, is available at any income level for people comfortable preparing their own return, though it doesn't include a state return.