According to Matt Jones, a senior editor at Edmonds website, there is a limit to how much money you can pay using your credit card when buying a car. There are different laws at each state on the subject, and dealers put limitations as well. “Dealer financing can be as low as six months at 0.9 percent interest, and even with credit card perks, that’s hard to beat,” explains Jones. When a customer uses a credit card, the dealer has to pay a transaction fee to the credit card company and that gets in the way of the profit. Make sure that you don’t get to pay that transaction fee, as you may be asked to do so by the dealer.