It is always a good idea to keep low balances on your credit card but did you know that by carrying cards with zero balances can actually hurt your credit rating? The reason for this is because if you have too much available credit, when you apply for a loan such as a mortgage, the credit rating agencies can lower your score because they feel that you might run up the balances once you get a home for furniture or to help you out if all of your available cash is going to the mortgage payment.Be careful!