Two Rules That Prohibit Debit Card Surcharges
That can result in fines, and if the breach of contract continues or is serious enough the merchant risks losing the ability to accept those credit cards. The other restriction is because surcharging on debit card purchases is illegal under federal law.
(a) In a sale of goods or services, a merchant may not impose a surcharge on a buyer who uses a debit or stored value card instead of cash, a check, credit card, or a similar means of payment.