TurboTax Fees: No, the processing system is limited to one credit card, so you won't be able to use two cards to pay.
IRS Tax Payment: You won't be able to use two different cards to make a credit card tax payment through Turbotax, but you can use the IRS site to make two separate payments (you will also save some money on the CC service charge with this method). You can use the link below to make payments by credit card. Inside TurboTax, you should select “pay by check” during the filing process. It will produce a payment voucher for you, which you can then ignore and make the credit card payments online later.
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