We just paid our taxes however we notice a service fee which is over $250. What is this fee for? If this is for use of credit card, how can we change payment method?

We chose credit card to pay over $10,000 in federal taxes. On my credit card account it is marked as 'L2G*SERVICE FEE. 

We were not aware that we had to pay an additional service fee, on top of the INTUIT bill, and would like to know what this is for.