The items in the supermarket belong to catering. According to the query of the State Administration of Taxation, the invoice for buying things in the supermarket has a catering service fee because the items in the supermarket belong to catering, and the catering invoice is a special invoice for the catering industry. Invoice refers to all units and individuals in the purchase and sale of goods, provide labor or accept labor, services, and engage in other business activities, provided to the other side of the receipt and payment of the written proof of the financial income and expenditure of the legal vouchers, is the original basis for accounting, but also auditing organs, tax authorities, an important basis for law enforcement checks.