When is my credit card payment considered to be late?
Under the law, a credit card company generally cannot treat a payment as late if it was received by 5 p.m. on the day that it was due. If the due date was not a day on which the card company receives or accepts mail (for example, Sunday or a holiday), the card company cannot treat a mailed payment as late if it was received by 5 p.m. on the next business day.