You can request a tax extension by filing Form 4868 with the IRS before your tax deadline

A tax extension gives you six additional months to file your federal income tax return. You do not need a reason to request one — the IRS grants extensions routinely. The extension applies only to filing your return, not to paying taxes owed. If you expect to owe money, you should estimate and pay it by the original deadline to avoid penalties and interest.

The most common way to request an extension is by submitting Form 4868 (Application for Automatic Extension of Time To File U.S. Individual Income Tax Return) to the IRS. You can file this form electronically through tax software, by mail, or through a tax professional. The deadline to submit Form 4868 is the same as your regular tax deadline — typically April 15 for most taxpayers.

Key Takeaways

  • Form 4868 must reach the IRS by your tax deadline (usually April 15) to grant you the extension; submitting it after that date does not work.
  • An extension gives you until October 15 to file your return, but does not extend the deadline to pay taxes you owe.
  • If you owe federal income tax, you should pay as much as you can estimate by April 15 to reduce penalties and interest on the unpaid balance.
  • You can file Form 4868 electronically through tax software, by mail, or through a tax professional; electronic filing is fastest and provides immediate confirmation.

How to file Form 4868 electronically

Electronic filing is the fastest way to request an extension. Most tax preparation software (TurboTax, H&R Block, TaxAct, and others) includes Form 4868 and can file it directly to the IRS. You do not need to complete your entire tax return — you only need to provide your name, address, Social Security number, and an estimate of your total tax liability.

When you file electronically, you receive immediate confirmation that the IRS received your form. Keep this confirmation for your records. The extension becomes effective as soon as the IRS accepts your submission, which usually happens within minutes. If you are filing jointly with a spouse, both of you must consent to the extension, and both names must appear on Form 4868.

Filing Form 4868 by mail or through a tax professional

You can also mail Form 4868 directly to the IRS. Download the form from IRS.gov, complete it by hand or print it from tax software, and mail it to the address listed in the form instructions (the address varies by state). Mail your form early — the IRS must receive it by your tax deadline, not just have it postmarked by that date. Mailing typically takes 5 to 10 business days, so send it at least two weeks before April 15.

A tax professional or CPA can file Form 4868 on your behalf. They have access to electronic filing systems and can submit the form immediately. If you are working with a tax preparer, ask them to file the extension while they gather your documents and information for your return.

What happens after you file Form 4868

Once the IRS accepts your Form 4868, your filing deadline moves from April 15 to October 15 (six months later). You do not need to do anything else to maintain the extension — it is automatic once filed. You can file your actual tax return anytime between when your extension is approved and October 15.

The IRS does not send a confirmation letter for Form 4868. Your proof of filing is the confirmation number from electronic filing or the receipt you keep if you mailed the form. If you filed electronically, save the confirmation email or screen. If the IRS has questions about your extension, they will contact you by mail.

Paying taxes owed when you file an extension

An extension to file is not an extension to pay. If you expect to owe federal income tax, you should pay by April 15 even if you have not filed your return yet. You can pay through the IRS website (IRS.gov/payments), by phone, by mail, or through your bank's bill-pay system. When you pay, indicate that the payment is for your 2024 tax return (or whichever year you are extending).

If you cannot pay the full amount owed by April 15, pay whatever you can. The IRS charges interest and penalties on unpaid taxes, but the penalty is smaller if you pay at least some of the amount by the deadline. When you file your return in the fall, you can pay the remaining balance or set up a payment plan for any balance still owed.

Who cannot use Form 4868

Most individual taxpayers can file Form 4868, but there are exceptions. If you are a nonresident alien, you generally cannot use Form 4868 — you must file your return by April 15 or request an extension through a different process. If you are a U.S. citizen or resident alien living outside the United States, you may be may have access to to an automatic two-month extension (until June 15) without filing Form 4868, though filing the form extends you to October 15.

If you are a member of the military on duty outside the United States, you may receive an automatic extension. Check the IRS website or contact a tax professional to determine whether you may have access to for a military extension or must file Form 4868.

What to do if you miss the April 15 deadline

If April 15 passes and you have not filed Form 4868, you have missed the deadline to request an extension. Filing the form after April 15 does not grant you an extension. However, you should still file your return as soon as possible. The penalty for filing late is usually larger than the penalty for paying late, so submitting your return quickly reduces the total penalty owed.

If you owe taxes and file late, the IRS charges both a failure-to-file penalty and a failure-to-pay penalty, plus interest. The sooner you file, the sooner you stop accumulating the failure-to-file penalty. If you are owed a refund, there is no penalty for filing late, but you should file within three years to claim the refund.

Frequently Asked Questions

Do I need a reason to request a tax extension?

No. The IRS grants Form 4868 extensions automatically — you do not need to explain why you need more time. The extension is available to anyone who requests it before the April 15 deadline.

If I file an extension, do I have to pay taxes by April 15?

The extension applies only to filing your return, not to paying taxes. If you owe money, you should pay by April 15 to avoid penalties and interest. You can file your return later, but payment is due on the original deadline.

Can I file an extension if I am expecting a refund?

Yes, but there is no penalty for filing late if you are owed a refund. You can file your return anytime and still receive your refund. However, filing by October 15 (with the extension) is simpler than filing after that date.

What if I file Form 4868 but then do not file my return by October 15?

If you do not file by October 15, you will owe failure-to-file penalties and interest on any taxes owed. The penalty continues to accrue after October 15. File your return as soon as possible to stop the penalty from growing.

Can I file Form 4868 on behalf of someone else?

A tax professional, CPA, or authorized representative can file Form 4868 on your behalf if you give them permission. A spouse can file jointly if both of you consent. A family member without power of attorney cannot file on your behalf.