1. Make clear what kind of service water charges belong to, such as living service and public service.
2, according to the nature of water charges, find the corresponding tax code. In China, water charges usually belong to the category of "life service", and the specific tax item code needs to be determined according to local tax regulations.
3 when issuing an invoice, fill in the column of "tax item classification" or "commodity code" of the invoice according to the found tax item code.