Q&A: How an unexpected credit score drop could signal a serious problem

Dear Liz: I pay off each of my credit card purchases online, usually within a few days. My monthly statement balance is usually $0 even though I use the card frequently. The card is my only open credit account. I saw my credit score recently and it has dipped below 650. It used to be over 800 several years ago. Is my diligence hurting my score? Should I wait to pay off my card until the statement posts? Is there another way to improve my credit?

Answer: A drop that drastic may indicate a more serious problem, such as a late payment or a collection account. Please check your credit reports at all three credit bureaus at AnnualCreditReport.com. (Enter the exact name in your browser as there are many look-alike sites that will try to charge you for what should be free access to your reports. If you’re asked for a credit card number, you’re on the wrong site.) Unexpected credit score drops can be an indication of fraud, so do this as soon as possible.

If you don’t see anything suspicious, then you probably can blame your habit of leaving a zero balance and having only one card. You don’t have to carry credit card debt to have good scores, but a small balance on the statement closing date helps indicate to credit scoring formulas that you are actively using your account. You can and should pay the balance off in full before the due date to avoid interest charges. Adding another credit account or two should further strengthen your scores.

You didn’t mention which score you saw (you have many) or where you got it, but consider monitoring at least one of your scores so you can gauge your progress. Banks and credit card companies often offer free scores. If yours don’t, consider signing up for another service that offers free scores. Discover, for example, offers free FICO scores to everyone, not just its own customers.