Did you pay taxes owed with a credit card? If so, there is a service fee which is charged by the card processor. Did you pay through TurboTax (which uses a third-party processor), or did you go to the IRS website and were linked to the processor's website?
See this FAQ on credit card payments:
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When you use a card to make a purchase from a store or online, the merchant pays a credit or debit card processing fee (which is usually a percentage of the purchase amount).
However, the IRS is forbidden by law to pay this, so the fee must be charged to you. This is not a TT fee.