Consumer Credit Regulation: 56(j) Prohibited practices
1. Periodic fees or charges. A card issuer may charge an over-the-limit fee or charge only if the consumer has exceeded the credit limit during the billing cycle. Thus, a card issuer may not impose any recurring or periodic fees for paying over-the-limit transactions (for example, a monthly “over-the-limit protection” service fee), even if the consumer has affirmatively consented to or opted in to the service, unless the consumer has in fact exceeded the credit limit during that cycle.