Acquiring relevant information shows that the tax rates for ordinary invoices in Tianjin in May are 3%, 6%, 10% and 16%. General invoices are composed of industry invoices and special invoices. The former is applicable to a certain industry and business, such as unified commercial retail invoices, commercial wholesale unified invoices, industrial enterprise product sales unified invoices, etc.; the latter is only applicable to a certain business item, such as advertising fee settlement invoices, commercial housing sales invoices, etc.