La información de este artículo está actualizada para el ejercicio fiscal 2025 (declaraciones presentadas en 2026).
If you filed Form 4868 to get a tax extension this year, the new deadline to file your 2025 federal income tax return is October 15, 2026. But there’s one important detail you need to keep in mind; an extension only gives you more time to file, it does not give you more time to pay. Any tax you owed was still due back on April 15th, and interest has been accruing daily since then. Here’s what extension filers need to know before the clock runs out
When Is the Tax Extension Deadline?
The extended deadline for individual returns (Form 1040) is October 15, 2026. Act now because there’s no second extension after this date and you’re subject to failure-to-file penalties.
An Extension to File Is Not an Extension to Pay
This is the single most misunderstood part of the process. Filing Form 4868 pushes back your paperwork deadline, but any tax you owed for 2025 was due on April 15, 2026. If you didn’t pay in full by then, you’ve been accruing:
- Interest on the unpaid balance, compounding daily (7% for Q3 2026)
- A 0.5% monthly late-payment penalty on the unpaid amount
Filing your return by October 15 stops the failure-to-file penalty from kicking in, but it doesn’t erase interest or late-payment charges that started back in April.
What Happens If You Miss the October 15 Deadline
Missing the extended deadline triggers a separate, steeper penalty on top of what’s already accruing.
| Penalty | Rate | Cap |
| Failure-to-file | 5% of unpaid tax per month (or part of a month) | 25% of unpaid tax |
| Failure-to-pay | 0.5% of unpaid tax per month | 25% of unpaid tax |
| More than 60 days late | Lesser of $525 or 100% of unpaid tax | — |
When both penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount for that month, so you’re not charged the full 5.5% twice. But the math still adds up fast: on a $600 balance filed more than 60 days late, the IRS charges the $525 minimum penalty plus accumulated interest — more than 100% of the original tax owed. Filing on time, even with a balance you can’t fully pay, avoids this entirely.
5 Tax Tips for Extension Filers Before October 15th
1. File now if you’re due a refund.
There’s no penalty for filing late when the IRS owes you money, but there’s also no reason to wait. The sooner you file, the sooner your refund shows up. Most returns can be completed with ezTaxReturn in 30 minutes or less with our simple step-by-step guidance.
2. Pay what you can now, even if it’s not the full amount.
Partial payments reduce the balance the late-payment penalty and interest are calculated on. Paying something before October 15th costs you less than paying nothing.
3. Set up an IRS payment plan if you can’t pay in full.
An approved installment agreement cuts the late-payment penalty in half, from 0.5% to 0.25% per month. It won’t stop interest, but it meaningfully slows the penalty side of the equation.
4. Gather your documents once — don’t let round two stall you.
Missing paperwork is the most common reason people extend in the first place. Use our tax prep checklist to pull together W-2s, 1099s, mortgage interest statements, and receipts for deductions in one sitting so you’re not restarting the search every time you sit down to file.
5. Adjust your withholding or estimated payments so this doesn’t repeat.
If you owed a large balance in April, that’s a signal your tax withholding or quarterly estimates are off. Adjusting now means less scrambling and a smaller bill next season.
Special Situations
Military members and combat zone service
Military members serving in a combat zone get automatic extended deadlines beyond October 15th. Generally, they have at least 180 days after leaving the combat zone to file and pay any tax due, plus the number of days they had left to file when they entered the combat zone.
Federally declared disasters
If the IRS has declared a disaster in your area, you may automatically qualify for additional filing and payment time beyond Tax Day, without needing to request it separately. Check IRS disaster relief announcements for your state and county.
Federal extension doesn’t always cover your state return
Filing IRS Form 4868 extends your federal deadline only. Some states automatically grant a matching extension when you file the federal one, but others require a separate state extension form with its own deadline. Check your state’s department of revenue site before assuming you’re covered.
Preguntas frecuentes
Do I have to pay a penalty if I’m getting a refund?
No. There’s no failure-to-file or failure-to-pay penalty if the IRS owes you money. Filing late delays your tax refund, but it doesn’t cost you anything in penalties.
What’s the penalty for filing after October 15?
The failure-to-file penalty is 5% of your unpaid tax per month (or part of a month), up to 25%. If you file more than 60 days late, the minimum penalty is the lesser of $525 or 100% of what you owe.
Can I get another extension past October 15?
No. October 15th is the final deadline for individual returns. There’s no second extension available for most filers, aside from specific exceptions like military combat zone service or federally declared disasters.
Does a federal extension automatically extend my state deadline?
It depends on your state. Some states extend automatically when you file federal Form 4868; others require a separate state extension request. Confirm the rule for your state before your state deadline passes.
What if I can’t pay my full tax bill by October 15?
File your return on time regardless, then request an IRS payment plan. Filing without full payment avoids the much larger failure-to-file penalty, and a payment plan can cut your ongoing late-payment penalty in half.
File Your Extended Return in Minutes
Whatever’s been holding you back, the fastest way to stop penalties and interest from growing is to just file. ezTaxReturn walks you through your extended return step by step, and most filers finish in 30 minutes or less.
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