Merchant Fees and Surcharges - Merchant Fees are the cost charged by a Third-Party Vendor to process transactions paid for by credit cards, generally in the 3% range. Fees are typically a burden to the Business Owner unless passed through to the Customer as a Surcharge (prohibited in Colorado, Connecticut, Florida, Kansas, Maine, Massachusetts, New York, Oklahoma, and Texas). However, you must notify credit card companies of your intention to charge Customers a surcharge.