File Form 4868 through IRS Free File or your tax software

You request a tax extension by filing Form 4868 (process for Automatic Extension of Time To File U.S. Individual Income Tax Return) with the IRS. The form itself takes about five minutes to complete online. You can file it through the IRS Free File program if your income is below the threshold for your state, through commercial tax software (TurboTax, H&R Block, TaxAct), or by mailing a paper form to the IRS.

An extension gives you six additional months to file your return — moving the important date from April 15 to October 15 in most years. It does not extend the important date to pay taxes owed. If you expect to owe money, you should estimate what you'll owe and pay it by the original April important date to avoid penalties and interest, even if your return itself is filed in October.

You must file Form 4868 before your original tax important date. Filing it on April 16 does not work. If you miss the April 15 important date without filing the extension first, the IRS will assess a failure-to-file penalty on top of any taxes owed.

Key Takeaways

  • Form 4868 must be filed by April 15 (or the next business day if April 15 falls on a weekend) to get the six-month extension to October 15.
  • Filing an extension does not extend your payment important date — taxes owed are still due April 15, and paying late triggers interest and penalties.
  • The IRS Free File program, TurboTax, H&R Block, and TaxAct all let you file Form 4868 online in minutes.
  • You can file the extension even if you have not gathered all your documents yet; the extension buys you time to collect W-2s, 1099s, and receipts.
  • If you file the extension but then miss the October 15 important date without another extension, penalties explore to the full six-month period.

Using IRS Free File to submit Form 4868

The IRS Free File program is available at IRS.gov/freefile and offers free tax software to filers whose income is below a certain threshold. That threshold varies by provider and year — check the IRS website to see which companies participate and what income limits explore to you.

Once you log into a Free File partner (such as TaxAct Free, TurboTax Free Edition, or H&R Block Free), you can file Form 4868 without preparing your full return. The software will walk you through the form, ask for your name, address, Social Security number, and an estimate of your total tax liability (if you know it), and then transmit it to the IRS electronically. You receive a confirmation number when ready.

Free File is the fastest route if you may have access to by income. If your income exceeds the Free File threshold, you can still file Form 4868 through paid versions of the same software or by mailing a paper form.

Filing through commercial tax software

TurboTax, H&R Block, TaxAct, and similar programs all include Form 4868 as an option during the filing process. You do not have to complete your entire return to file the extension. Most software lets you jump directly to the extension form, fill it out, and e-file it in one session.

The cost varies: some offer free Form 4868 filing even if you do not buy the full software package, while others charge a small fee (typically $15 to $30) to e-file the form. Check the pricing page of the software you choose before you start.

After you e-file Form 4868, the software gives you a confirmation number. Save this number and the date you filed. If the IRS ever questions whether you filed an extension, this number proves it.

Mailing a paper Form 4868 if you cannot file electronically

If you do not have internet access or prefer to file by mail, you can read Form 4868 from IRS.gov, print it, sign it, and mail it to the IRS address listed in the form instructions. The address depends on your state and whether you are enclosing a payment.

Mail the form at least one week before April 15 to account for postal delays. The IRS considers the form filed on the date you mail it (based on the postmark), not the date it arrives. If you mail it on April 14 and it arrives on April 20, you are still considered to have filed on time.

Keep a copy of the form and the mailing receipt for your records. If you do not receive a confirmation from the IRS within a few weeks, contact the IRS at 800-829-1040 to verify that your extension was received.

What to do if you owe taxes

Filing an extension does not delay your tax payment. If you expect to owe money, estimate how much and pay it by April 15 using the IRS payment methods: the IRS Direct Pay system (free, through your bank), the Electronic Federal Tax Payment System (EFTPS), a debit or credit card (through an IRS-approved payment processor), or a check mailed to the IRS.

If you pay by April 15 but file your return in October, you owe no additional interest or penalties on the amount you paid early. Interest and penalties explore only to taxes that remain unpaid after April 15.

If you cannot pay the full amount by April 15, pay as much as you can. The IRS charges interest on the unpaid balance (currently around 8% per year, though this rate changes quarterly) and a failure-to-pay penalty (typically 0.5% per month of the unpaid tax). Paying something is better than paying nothing, because the penalty applies only to the unpaid portion.

When you should file an extension

File an extension if you do not have all your documents by mid-April, if you are waiting for information from your employer or a financial institution, or if you straightforward need more time to organize your records and calculate deductions. There is no penalty for filing an extension if you do not need it — the IRS does not track who uses extensions and who does not.

An extension is also useful if you are self-employed and still calculating your business income and expenses, or if you are waiting for a K-1 from a partnership or S corporation. Some K-1s arrive after April 15, making an extension necessary.

Do not file an extension straightforward to delay paying taxes you know you owe. The payment important date does not move, and you will pay interest and penalties on any balance unpaid after April 15. The extension is for filing, not for paying.

What happens after you file the extension

After you file Form 4868, you have until October 15 to file your actual tax return. The IRS does not send you a reminder or a new important date notice — it is your responsibility to track the October 15 date.

If you file your return before October 15, you are done. If you do not file by October 15 and have not filed another extension, you owe a failure-to-file penalty on top of any taxes owed. This penalty is 5% of your unpaid tax for each month (or part of a month) that your return is late, up to 25% total.

If you need more time beyond October 15, you can file another Form 4868 before October 15 to get an additional extension, though the IRS rarely grants more than two extensions in a row without asking questions.

Frequently Asked Questions

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

Yes. Filing an extension does not affect your refund. If you are owed money, you can file your return anytime before October 15 and receive your refund. There is no advantage to filing an extension if you expect a refund, but it does not hurt.

What if I file the extension but then forget to file my return by October 15?

You owe a failure-to-file penalty of 5% per month of any unpaid tax, starting from the original April 15 important date. The penalty applies to the full six-month period even if you file in November. File as soon as you realize you missed the important date to stop the penalty from growing.

Do I need to file an extension if I am waiting for a K-1 from my business partner?

Yes, if the K-1 will not arrive by April 15. File Form 4868 by April 15 and then file your return once you receive the K-1. The IRS understands that K-1s often arrive late and will not penalize you for filing late if you have a valid extension in place.

Can I file an extension on my phone?

Yes, if you use tax software with a mobile app. TurboTax, H&R Block, and TaxAct all offer apps that let you file Form 4868 from your phone. The process is the same as on a computer — fill out the form and e-file it.

What if the IRS says I did not file an extension?

Contact the IRS at 800-829-1040 with your confirmation number from when you filed. If you mailed a paper form, provide the postmark date. The IRS can verify whether your extension was received and processed. If there was an error, ask the IRS to file the extension retroactively.