job cost sheet

Imagine a folder that travels with each order as it moves through the workshop. Every time someone draws wood from the storeroom, that cost gets written in the folder; every time a worker logs hours on this order, that labor gets written in; and a calculated slice of factory overhead gets added too. When the order is finished, the folder shows, in one place, exactly what that order cost to make. That folder — paper or, today, a screen in software — is the job cost sheet.

A job cost sheet is the detailed subsidiary record for a single job under job-order costing. It has three running sections: direct materials (from materials requisition forms), direct labor (from time tickets), and applied manufacturing overhead (computed using the predetermined overhead rate times the actual amount of the allocation base the job used). Add the three and you get the total cost of the job; divide by the number of units in the job and you get unit cost. While the job is still in process, the sheet's balance is part of Work in Process inventory; when the job finishes, that balance moves to Finished Goods; when the goods are sold, it becomes Cost of Goods Sold. So the collection of job cost sheets for unfinished jobs literally is the subsidiary ledger backing the Work in Process control account.

Job cost sheets matter because they are where abstract cost accounting becomes concrete and auditable. They let a manager quote a price with a known cost floor, compare estimated versus actual cost, spot a job that overran, and bill a client for time and materials. The common misconception is that the overhead figure on the sheet is what overhead 'really' cost that job — it is not; it is an applied amount based on a rate set in advance, and any gap between applied and actual overhead shows up later as under- or over-applied overhead, not on the sheet itself.