What is the cheapest invoice for maintenance fees

Ordinary invoice. Usually maintenance fees should be issued ordinary invoices, in China, the tax rate of ordinary invoices is 3%, while the tax rate of special invoices is 6%, therefore, if the purchase of goods can be issued ordinary invoices, then choose to open ordinary invoices will be more cost-effective. Maintenance fee is the fee charged for the maintenance and upkeep of a certain equipment, facility or service.