Fees charged by credit card institutions. The tax point of credit card swiping is calculated according to a certain proportion of the transaction amount, which is determined by credit card institutions and merchants through consultation, so the tax point will be different between different credit card institutions and merchants. Some credit card institutions will waive the tax point fees for some consumer behaviors. For example, some credit cards are exempt from taxes and fees in supermarket consumption, fuel consumption and catering consumption, and these free policies will be publicized in official website, a credit card institution.