How to File a Tax Extension With the IRS (And Why You Should Still Pay by the Deadline)

Every year, millions of taxpayers file for an extension — and every year, millions of taxpayers misunderstand what an extension actually does. If you're not going to be ready to file by the April deadline, an extension is a legitimate and easy option. But there's one critical piece that often gets overlooked, and it can cost you.

What a Tax Extension Actually Does

Filing a tax extension gives you an additional six months to submit your completed tax return to the IRS. For most individual taxpayers, the standard deadline is April 15th. An approved extension moves your filing deadline to October 15th. There are no penalties for filing late if you have an approved extension and your return is submitted by the extended deadline.

What an Extension Does NOT Do

A tax extension is an extension to file, not an extension to pay. If you owe taxes for the year, that payment is still due by the original April 15th deadline — even if you're not filing your return until October. If you don't pay by April 15th, the IRS will charge interest and a failure-to-pay penalty on the amount owed, regardless of whether you have an extension.

How to File for an Extension

You'll need to file Form 4868 — "Application for Automatic Extension of Time to File U.S. Individual Income Tax Return." There are a few ways to do it:

• IRS Free File: If your income is $79,000 or below, you can file Form 4868 for free at IRS.gov through the Free File program
• Tax software: Most major tax software programs allow you to file an extension directly through the platform
• Through a tax preparer: If you're working with a professional, they can file the extension on your behalf
• By mail: You can print, complete, and mail Form 4868 — it must be postmarked by the April deadline

The extension is automatic — the IRS does not send you an approval notice. As long as Form 4868 is filed correctly and on time, the extension is granted.

Making an Estimated Payment With Your Extension

Since any taxes owed are still due by April 15th, the standard practice is to make an estimated payment at the same time you file the extension. You don't need to know the exact amount — just make a reasonable good-faith estimate.

• Pay online through IRS Direct Pay at IRS.gov (free, no account required)
• Pay by debit or credit card through an IRS-authorized payment processor
• Mail a check with your Form 4868 if filing by paper

If you overpay, the excess will be applied to your refund when you file your return. It's generally better to pay a little more than you think you owe than to underpay and face penalties.

Who Should Consider Filing an Extension?

• You're still waiting on documents (late 1099s, K-1s from partnerships or S-corps)
• You had a major life event — a move, marriage, divorce, or loss — that disrupted your preparation
• Your tax situation is complex and you need more time to work with a professional
• You simply haven't had time to get organized and don't want to file a rushed, potentially incorrect return

Filing an inaccurate return on time is worse than filing a correct return a few months late.

When It Makes Sense to Work With a Professional

Filing Form 4868 itself is straightforward. But figuring out how much to pay with your extension — especially if you're self-employed, have multiple income sources, or experienced significant income changes — is where things can get tricky. A tax professional can review your situation, estimate your liability accurately, help you determine the right payment amount, and file the extension on your behalf.