Unbilled WIP — time earned but not yet invoiced

The question: what have we earned and not yet asked for? The Unbilled Time report lists every entry that is approved, billable and not yet billed, grouped by project, and values each one — regular hours at the billing rate, overtime at the rate times the company multiplier. It is the billing worklist as much as a report: work down it by billing the projects it names (§9.5), and watch the total fall. A WIP figure that only ever grows is work being done for free on the instalment plan.