Work in process (WIP) refers to partially completed goods that are awaiting further production steps before being finished and ready for sale. WIP includes the raw materials, labor costs, and overhead that have been incurred so far in the production process. Companies track WIP as a current asset on their balance sheets, and the costs are eventually transferred to finished goods inventory and then to cost of sales when products are complete. Optimal production aims to minimize the amount of goods stuck in WIP status.