This is mostly true. You want to keep your credit under a certain threshold, generally 30% of your credit limit. There is no knowing when you will be polled. It is these polls where your utilization does have memory. If you max your card, you'd want to pay it off immediately. Waiting for your statement, despite not accruing any interest on it, is risky for this reason. Now people can understand credit a little better instead of being shamed for not.