ExpressExtension allows you to choose the payment option for paying the tax amount right when you e-file your extension. You can choose between Electronic Funds Withdrawal (EFW), Electronic Federal Tax Payment System or check or money order.
If opted for EFW, you need to provide your checking or savings account information. For EFTPS, it's your responsibility to visit their portal www.EFTPS.gov to pay your tax dues. For check or money order, you need to make sure that they are payable to the "United States Treasury."
When you file Form 7004 & 8868, you'll come across the payment options EFW & EFTPS, and for Form 4868, you'll have the payment options EFW, Debit/Credit card, and Check or Money Order.
To make payment through Debit/Credit card, visit https://www.irs.gov/payments/pay-your-taxes-by-debit-or-credit-card
To get information about the payment options, click here.