Systems and methods for determining a least cost transaction scheme for a merchant is provided according to one embodiment of the invention. The least cost transaction scheme may be determined at a point of sale device or at a host computer system that communicates with a point of sale device. The least cost transaction scheme may depend on a standard industrial classification (SIC) code associated with the merchant and a transaction amount. In one embodiment the transaction amount and merchant ID is sent to a host computer system. Based on the merchant ID and the transaction amount the host computer system determines a fees for a plurality of transaction schemes. From the plurality of transaction schemes, a least cost transaction scheme is selected and a user is prompted to use the least cost transaction scheme to tender the transaction.