What is the tax classification code? The tax classification and coding of goods and services means that in the upgraded version of VAT invoices, the goods on the face of taxpayers should be related to the tax code approved by the State Administration of Taxation, and invoices should be issued according to the tax rate and collection rate indicated on the classification code. It can also enable tax authorities to count, screen, analyze and compare data, with the ultimate goal of strengthening tax collection management.