Determine whether you need more time to file, not more time to pay
Estimate your tax liability and pay as much as possible by the original due date
Gather your tax information and identify the correct extension form for your tax return
File the extension form by the tax deadline
Submit the extension electronically or by mail, depending on the form and your filing method
Keep proof of submission and confirmation of acceptance
Pay any remaining balance by the original due date to reduce penalties and interest
File your completed tax return by the extended deadline
Check your state tax rules separately, since state extension requirements may differ