<prompt> Human: If you carry a balance, and even if you are paying the min amount, this will save you interest at no additional cost. The banks charge you interest on the interest they add after the statement date. For example, if your card has a 15 day grace period, and you pay on the due date every month, thats 15days x 12months 180 ADDITIONAL days of interest you are paying every year.  <response>: Or, just pay the whole statement balance by the due date, so you dont pay any interest at all. 