Invoice code is the code given to the invoice by the tax department. When querying the authenticity of the invoice, you need to enter the invoice code, and the receipt invoice code is the code given by the tax department. The code of ordinary invoice, which is often called manual invoice, is 12. The codes of special VAT invoices and general VAT invoices were originally 10, and 10 was adjusted from 20 18 to 1 in October, and the invoice code of new general VAT invoices (discounted tickets) was adjusted from 10 to 12. The number 1 of an ordinary invoice is the tax bureau code (1 national tax 2 local tax), the numbers 2 to 5 are the first four digits of the administrative division code, the numbers 6 to 7 are the year code (the last two digits are taken, of which 2005 is 05), and the number 8 is the invoice industry code.