Abstract: A computer-implemented transaction processing system includes a card reader and a plurality of modules each comprising code that executes in the processor. The card reader transfers credit card data from a credit card of a customer to a memory of the computer. A check presentation module is operative to calculate a sales tax associated with a price of a product sold to the customer. An approval module is operative to obtain an approval against the credit card data in the memory for at least the price of the product and the sales tax and thereby define an approved sale transaction. A revenue settlement module and a tax settlement module are operative to settle respective portions of the sales transaction(s) to different accounts, such that a revenue portion goes to a first account free of any sales tax, and a sales tax portion goes to the other account.