Is credit card surcharging legal in South Dakota?

Usually yes, with conditions. South Dakota allows a credit card surcharge but attaches rules you have to meet. South Dakota permits credit card surcharges but its Consumer Protection division publishes firm conditions. The surcharge may not exceed what the merchant actually pays to accept credit cards, it must be disclosed at the store entrance and the point of sale — or on the home page for an online seller — and the dollar amount must appear on the transaction receipt. The disclosure has to identify the merchant as the source of the fee and state that it does not exceed the merchant's processing cost. We did not find a dedicated South Dakota statute; these requirements are published as consumer-protection guidance.