This is a very good question and thanks for asking it! When it comes down to it, most credit cards will come with a minimum finance charge. In this case it looks like your minimum finance charge is $2.45. I know that this comes on a balance that was only there for a couple days after the grace period but the way minimum finance charges work is, if there is a balance at the end of a grace period, it will be charged. I would say for more information, look at your card member agreement. It will tell you a bit more about your grace period and minimum finance charges. Also, I would like to invite you to my website, www.JemCreditcards.com for more financial help articles! If you don't mind me asking, what bank is it that is charging you an interest rate of 14% even this is rare with US based banks, I may be able to direct you to a great balance transfer account with a lower long term rate as well. Take a look at the Discover more card or the Chase slate card at JemCreditCards.com/discover-credit-cards.html or JemCreditCards.com/chase-credit-cards.html also, follow me if you would like, I will be writing an article about compounding interest rates and minimum finance charges soon!