Invoices issued in the current month must be included in the income of the current month, and shall not be advanced or delayed.
Generally speaking, the agent bookkeeping will send all the invoices and attachments of last month to the bookkeeping company during the period of 1- 10 every month, and there will be no great lag.
Internal accounts don't matter. After all, it is an account that reflects the internal profits of your own company. Just do as the leader says.