Your credit score affects your ability to get loans and favorable interest rates. A credit card with no balance can help improve your credit score, so consider the benefits of keeping it that way. Payment History Your payment history accounts for 35 percent of your FICO score, the most widely used credit score. A credit card with no balance remains on your credit history, even until seven years after you close it, according to the Motley Fool, so unused cards do contribute to good credit. Credit Ratio The credit limit of your card...