Preparing WIP evidence for year-end auditors

Work-in-progress is where manufacturing audits slow down. Auditors need to believe both the quantity on the floor and the cost attached to each stage. Plants that wait until the sample list arrives usually lose a week.

Stage is a claim—prove it

A traveler card, barcode scan history, or signed station checklist beats a verbal “it’s mostly done.” If your process is paperless, export the MES or shop-floor timestamps before the period closes.

Photographs help when tags do not

For large fabrications that cannot be moved to a count cage, dated photos with job numbers in frame are imperfect but useful supporting evidence—especially when paired with a supervisor sign-off.

Cut-off around shipments and receipts

WIP is entangled with finished goods and raw materials. Note shipments left the dock after close, and materials received but not yet issued. A one-page cut-off memo saves repeated email threads.

Tie to the ledger early

Ask costing to freeze a WIP aging by job the morning after close, then reconcile to the GL control account before auditors ask. Differences you find yourself are cheaper than differences they find.

A pre-audit readiness pass often starts here because WIP questions cascade into overhead absorption and margin stories leadership already cares about.