What does Form 4868 do?

Form 4868, Application for Automatic Extension of Time to File U.S. Individual Income Tax Return, gives individual taxpayers an automatic 6-month extension to file their federal income tax return. For the 2025 tax year, filing Form 4868 by April 15, 2026 extends your filing deadline to October 15, 2026. It does not extend your deadline to pay any taxes owed.

Does a tax extension give you more time to pay?

No. This is the most important thing to understand about Form 4868. A tax extension only extends your deadline to file the return — it does not extend your deadline to pay taxes owed. Any taxes owed for the 2025 tax year are still due by April 15, 2026, even if you file an extension. Interest and late-payment penalties apply to any unpaid balance after April 15.

How do I file Form 4868?

You can file Form 4868 electronically through IRS Free File (free for all income levels for extensions), through tax software, or by mailing a paper form. You can also get an automatic extension simply by making a payment online at IRS Direct Pay or EFTPS and designating it as an extension payment. Form 4868 must be filed or your payment made by April 15, 2026 for the 2025 tax year.

What is the deadline for Form 4868 for 2025 taxes?

For the 2025 tax year (returns filed in 2026), Form 4868 must be filed by April 15, 2026. This is the same as the regular filing deadline. Filing Form 4868 by April 15 automatically extends your filing deadline to October 15, 2026. There is no extension past October 15.

Is filing a tax extension a red flag with the IRS?

No. Filing a tax extension is routine — over 19 million taxpayers file extensions each year. The IRS grants extensions automatically without requiring any explanation. Filing an extension does not increase your audit risk or trigger any negative flag with the IRS. It is a legitimate and widely used compliance tool.

What happens if I file an extension but still miss the October deadline?

If you file an extension but then fail to file your return by October 15, 2026, the failure-to-file penalty begins on October 16. The penalty is 5% of unpaid taxes per month, up to 25%. After 60 days the minimum penalty is $525 (for 2026) or 100% of taxes owed, whichever is less. There is no second extension available beyond October 15 for individual returns.

Does a federal extension automatically extend my state return?

Not always. Some states automatically honor a federal Form 4868 extension and grant you the same extended filing deadline. Others require a separate state extension form, and some require payment by the original state deadline regardless. Check with your state tax agency before assuming your federal extension covers your state return.

IRS Form 4868: Tax Extension Guide — More Time to File, Not to Pay (2026)