You don’t need to file Form 4868 if you make a payment using the IRS
electronic payment options.
===
You can pay all or any part of your estimated income tax due and **indicate that the payment is for an extension** using Direct Pay, the Electronic Federal Tax Payment System, or using a credit or debit card. Your extension is then automatically granted and you will receive a confirmation number for your records.
Any amount, even $10 will do the trick.
---
If you e-file Form 4868 and mail a check or money order to
the IRS for payment, use a completed paper Form 4868 as a
voucher. Please note with your payment that your extension request
was originally filed electronically.
