Prepayment of value-added tax means paying taxes in advance, that is, paying taxes in advance before the actual tax payment time. Value-added tax is a turnover tax levied on the basis of the value-added generated in the process of commodity circulation. From the tax principle, value-added tax is a turnover tax levied on the added value of many links such as commodity production, circulation and labor services or the added value of commodities. Extra-price tax is implemented, that is, it is borne by consumers, and tax is levied only if there is value added, and tax is not levied if there is no value added.

Value-added tax is a tax levied on the value-added of units and individuals who sell goods or provide processing, repair and replacement services and import goods. Value-added tax has become one of the most important taxes in China, accounting for more than 60% of all taxes in China, and it is the largest tax. Value-added tax is collected by the State Taxation Bureau, and 50% of the tax revenue comes from the central government and 50% from local governments. The import value-added tax is collected by the customs, and all the taxes are the central fiscal revenue.