Payment networkCredit cardsDebit cardsInternational payments American Express 1.45% — — Mastercard 0.72% 0.20% 1.99% Visa 0.75% 0.40% 1.99% For example, if your tax bill is $3,000 and you’re paying with a Mastercard credit card, there will be a $21.60. » MORE: What’s the differen...