When to Process Intercompany Billing
In general, process Intercompany Billing whenever you want to assess the Income Statements of your companies.
For example, if the managers in your enterprise want to see Income Statements on a weekly basis, then you must process Intercompany Billing weekly, because processing Intercompany Billing can affect profit and loss figures. If you have users who access Income Statements throughout the accounting period, you should process Intercompany Billing after every timesheet posting (at a minimum).
You should process Intercompany Billing at least once a month, perhaps as part of your usual month-end procedures. Note that if you make any last-minute adjustments to labor or expenses that affect intercompany transactions, you must process Intercompany Billing again to get accurate data.