You can e-file your federal tax extension in minutes with TurboTax Easy Extension. However, If you’d rather mail your extension directly to the IRS, simply refer to IRS Form 4868: Application for Automatic Extension of Time to File U.S. Individual Income Tax Return, complete and print the form, and send it to the IRS address for your state.
Form 4868 Line 4—Estimate of Total Tax Liability for 2024 Enter on line 4 the total tax liability you expect to report on your 2024:
• Form 1040, 1040-SR, or 1040-NR, line 24; or
• Form 1040-SS, Part I, line 7. If you expect this amount to be zero, enter -0-.