April 15, 2026 — Deadline to file your 2025 federal tax return, pay any tax owed, and (if you need more time) file for an extension.
October 15, 2026 — Deadline to file your 2025 return if you requested an extension. This is not an extension to pay — any tax owed was still due April 15.
Some taxpayers get automatic extra time without asking:
- U.S. citizens/residents living abroad generally get an automatic two-month extension to June 15, 2026 (interest still accrues on unpaid tax from April 15).
- Taxpayers in federally declared disaster areas often get extended deadlines — check IRS.gov for disaster relief announcements in your area, since these dates vary by location and event.
How to file an extension by April 15
If you can't finish your return in time, request an automatic six-month extension using one of these methods — all must happen by April 15, 2026:
- File Form 4868 electronically through IRS Free File, tax software, or a tax professional.
- Mail a paper Form 4868, postmarked by April 15.
- Make an electronic payment toward your estimated tax due (via IRS Direct Pay, a debit/credit card, or a digital wallet) and indicate it's for an extension — this automatically registers the extension without a separate form.
An extension only pushes your filing deadline to October 15, 2026. It does not extend the time you have to pay. To avoid penalties, estimate your tax liability and pay as much as you can by April 15.
What if you file after April 15 without an extension?
You can still file — the IRS accepts e-filed returns for months afterward — but you'll likely face penalties if you owe tax:
Failure-to-file penalty: 5% of unpaid tax for each month (or partial month) your return is late, capped at 25%. If you're more than 60 days late, there's a minimum penalty of whichever is smaller: $525 or 100% of the unpaid tax.
Failure-to-pay penalty: 0.5% of unpaid tax per month (or partial month), also capped at 25%. If both penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount, so the combined rate is 4.5% + 0.5% = 5% per month rather than stacking to 5.5%.
Interest: Charged on any unpaid balance from April 15 until paid in full, compounding daily. The rate is the federal short-term rate plus 3%, adjusted quarterly.
If you're due a refund, there's no penalty for filing late — but you must file within 3 years of the original due date to claim it, or the refund is forfeited. For 2025 returns, that means filing by April 15, 2029.
Bottom line if you're late and haven't filed an extension: File as soon as you can, even if you can't pay the full balance. The failure-to-file penalty (5%/month) is ten times steeper than the failure-to-pay penalty (0.5%/month), so filing quickly — even with a partial payment or none at all — limits the damage far more than waiting until you have the money.
What if you filed an extension but missed October 15?
The same failure-to-file and failure-to-pay penalties and interest apply, calculated back to April 15 for any unpaid tax (the extension only protected you from the failure-to-file penalty through October 15, not from interest or the failure-to-pay penalty on unpaid amounts). File as soon as possible to stop the failure-to-file penalty from continuing to accrue.
Note: Both our tax software and the IRS's own e-file system shut down for annual maintenance later in the year to prepare for the next filing season. In recent years the IRS shutdown has landed in late November or late December (exact dates vary and are announced closer to the time). Our software sets our own internal cutoff a little earlier than that to leave time for processing. If you're filing after October 15, it's worth checking the software cutoff date and e-filing as soon as you can rather than waiting. If the e-file window has already closed by the time you're ready to file, you'll need to print and mail your return instead.
Options if you owe more than you can pay
- IRS payment plans (short-term or long-term installment agreements) can be set up online at IRS.gov and reduce the failure-to-pay penalty rate while active.
- First-time penalty abatement may be available if you have a clean compliance history for the prior three years.
- Reasonable cause relief can apply for circumstances like serious illness, natural disaster, or other situations beyond your control.
Quick reference
| Situation | Deadline | Penalty if missed |
|---|---|---|
| File & pay in full | April 15, 2026 | None |
| File Form 4868 (extension) | April 15, 2026 | None (but pay estimated tax by April 15 to avoid interest/failure-to-pay) |
| File extended return | October 15, 2026 | Failure-to-file penalty resumes if missed |
| File late, no extension, tax owed | After April 15 | 5%/month failure-to-file + 0.5%/month failure-to-pay + interest |
| File late, refund due | Any time within 3 years | None, but refund lost after 3 years |
This is general information, not tax or legal advice. Check IRS.gov for guidance specific to your situation, since dates can shift for weekends, holidays, or disaster relief.