It should not be called a tax bill, but a special seal for invoices.

Special seal for invoice refers to the seal stamped by the unit or individual who uses the ticket with its name, tax registration number and special seal for invoice when issuing invoice. The style of the special invoice seal is determined by State Taxation Administration of The People's Republic of China, People's Republic of China (PRC).

The tax authorities shall keep the impression of the special seal for invoices provided by the units and individuals who purchase invoices for future reference. In other words, you need to go to the tax bureau to record the special seal for invoices.