Yes, you can file a tax extension on April 15, and the request is automatic — the IRS grants anyone who asks before midnight a six-month extension to October 15, no explanation required.1Internal Revenue Service. Get an Extension to File Your Tax Return The part that catches people: an extension to file is not an extension to pay. Whatever you owe is still due April 15, and interest starts running the next day.
Three Ways to File Before Midnight
Any of these works right up to 11:59 p.m. on April 15. Pick the one that fits.
IRS Free File
The fastest option is filing Form 4868 electronically through IRS Free File. There is no income limit for using Free File to request an extension — anyone can use it regardless of what they earn.2Internal Revenue Service. File an Extension Through IRS Free File You get an electronic acknowledgment almost immediately. Save it. That confirmation is your proof the extension went through.3Internal Revenue Service. Topic No. 304, Extensions of Time to File Your Tax Return
IRS Direct Pay
If you owe money and want the extension and the payment done in a single step, use IRS Direct Pay. Select “Extension” as the reason for payment, verify your identity, and submit a payment from your bank account. The system registers your extension automatically, so you don’t need to file a separate Form 4868.4Internal Revenue Service. Direct Pay Help Full or partial payments both work.5Internal Revenue Service. Types of Payments Available to Individuals Through Direct Pay
Paper Form 4868 by Mail
You can mail a completed Form 4868. The correct address depends on your state and whether you’re enclosing a payment, so check the IRS list before you send it.6Internal Revenue Service. Form 4868 Addresses for Taxpayers and Tax Professionals Send it certified with a return receipt. The IRS uses the postmark date to determine whether your extension was timely, and certified mail proves that date if it’s ever in question.7Internal Revenue Service. When to File
What You Need to Fill Out Form 4868
The form is short. Have three things ready before you start:8Internal Revenue Service. Form 4868 – Application for Automatic Extension of Time to File US Individual Income Tax Return
- Your Social Security number, plus your spouse’s if you’re filing jointly.
- Your best estimate of your total tax liability for the year, based on income, deductions, and credits.
- The total you’ve already paid through withholding and quarterly estimated payments.
The estimate matters more than most people realize. The IRS requires a good-faith estimate. Lowball the number just to avoid writing a check and the IRS can declare the extension invalid, which drops you back into failure-to-file territory. An honest mistake still counts as good faith. A deliberately unreasonable figure does not. Form 4868 can’t be amended after you file it, so spend a few extra minutes getting the numbers as close as you can.
Your Payment Is Still Due April 15
This is where the extension trap closes on people. The paperwork deadline moves to October 15. The payment deadline does not.8Internal Revenue Service. Form 4868 – Application for Automatic Extension of Time to File US Individual Income Tax Return Any unpaid balance after April 15 starts accruing both interest and penalties.
The failure-to-pay penalty is 0.5% of the unpaid tax for each month or partial month it remains outstanding, capped at 25%.9Internal Revenue Service. Failure to Pay Penalty Interest, set quarterly by the IRS, is charged on top of that and compounds daily.10Internal Revenue Service. Internal Revenue Bulletin 2026-8
There is a way to sidestep the late-payment penalty during the extension window. If you pay at least 90% of your actual tax liability by April 15 and pay the rest with your return by October 15, the IRS waives the failure-to-pay penalty for the extension period.11Internal Revenue Service. Late Filing and Late Payment Penalties You’ll still owe interest on the unpaid portion, but avoiding the penalty is a real savings.
What Happens If You Skip April 15 Entirely
If you neither file a return nor request an extension by April 15, the numbers change fast. The failure-to-file penalty is 5% of unpaid taxes per month — ten times the failure-to-pay rate — and it maxes out at 25% after five months. Returns filed more than 60 days late carry a minimum penalty of $525 or 100% of the unpaid tax, whichever is less.12Internal Revenue Service. Failure to File Penalty
When both penalties apply in the same month, the IRS reduces the failure-to-file penalty by the failure-to-pay amount, so the combined rate is 5% per month rather than 5.5%.13Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges Over time the combined maximum can still reach 47.5% of the unpaid balance. Filing the extension on April 15, even with no payment attached, eliminates the failure-to-file penalty entirely. That alone is worth the five minutes.
If You Cannot Pay What You Owe
Not being able to pay is not a reason to skip filing. The IRS offers payment plans and setting one up is straightforward. A short-term plan gives you up to 180 days to pay in full, with no setup fee for individuals who apply online. For larger balances, a long-term installment agreement lets you make monthly payments; you can apply online, by phone, by mail, or with Form 9465. While a payment plan is pending or active, the IRS generally cannot levy your wages or bank accounts.14Internal Revenue Service. Payment Plans; Installment Agreements Interest and the monthly late-payment penalty keep running on the unpaid balance, so paying as much as you can up front still helps.
When You Already Have More Time Without Asking
Some taxpayers get extra time automatically, without filing Form 4868.
U.S. Citizens and Residents Living Abroad
If you live and work outside the United States, you get until June 15, 2026, to file your 2025 return and pay any tax due, with no form required. If you need still more time after that, you can request a further extension to October 15 by filing Form 4868 before the June deadline.7Internal Revenue Service. When to File Interest on unpaid tax still runs from April 15.
Military Members in Combat Zones
Service members deployed to a combat zone get all tax deadlines suspended for the duration of the deployment plus 180 days after leaving the zone. This covers both filing and payment, and no penalty or interest accrues during that period.15Internal Revenue Service. Extension of Deadlines – Combat Zone Service
Federally Declared Disaster Areas
When the IRS grants relief for a federally declared disaster, affected taxpayers get automatic deadline postponements. No call, no form. Taxpayers affected by severe storms in Washington State in late 2025, for example, received an automatic extension to May 1, 2026, covering returns and payments originally due between December 9, 2025, and April 30, 2026.16Internal Revenue Service. IRS Announces Tax Relief for Taxpayers Impacted by Severe Storms in the State of Washington Check the IRS disaster relief page to see whether your area qualifies and what the specific deadlines are.
Your State Return Is a Separate Question
A federal extension does not automatically cover your state return. Some states grant an automatic state extension when you file federal Form 4868. Others require their own form. State payment deadlines and penalty rates vary too. If you owe state income tax, check your state tax agency’s website before April 15 to see what it requires. Missing a state deadline triggers its own penalties and interest, independent of anything happening at the federal level.