this is not true. while yes, it is best to pay off any balance on your credit card each month, especially for cards with a high interest rate, having a very small balance is still good to maintain each month.a couple hundred dollars each month is fine to carry over. it will not hurt your credit score, just as long as it's a low balance. it shows you using the credit you have available, it shows your an active buyer and really, the credit agencies want to see you using your credit limit responsibly.