Tracking Raw Material, WIP and Finished Goods
Most factories have some visibility at the edges: they know roughly what raw material came in and what finished goods went out. The blind spot is everything in between. Work-in-progress (WIP) inventory — stock that has left the raw material store but has not yet become a finished product — is where discrepancies accumulate and costing breaks down.
Why Three Stock Categories, Not One
Manufacturing stock is not a single pool. Each stage has different characteristics and different risks:
| Stage | What it is | Common risk |
|---|---|---|
| Raw Material | Purchased inputs not yet consumed | Over-purchasing, expiry, theft |
| WIP | Material in process on the floor | Loss, yield variance, scrap |
| Finished Goods | Completed units awaiting despatch | Mis-picks, unrecorded transfers |
When these three categories share a single stock bucket, you cannot tell whether a discrepancy happened in the store, on the line, or in despatch. Investigations take days and usually reach no firm conclusion.
How WIP Inventory Gets Lost
WIP losses are rarely large single events. They accumulate through:
- Yield variance — the process consumes 6% more material than the BOM allows, and no one records why
- Rework loops — rejected units re-enter production but are not booked back into WIP correctly
- Informal transfers — a supervisor borrows material from one job to complete another and the paperwork never catches up
- Scrap without recording — off-spec output is binned without a scrap transaction
Each of these, individually, is a rounding error. Cumulatively across a month, they can explain a stock variance that management is attributing to supplier short-shipments or pilferage.
Setting Up Three-Stage Tracking
The mechanics are straightforward. Each production order drives two stock movements:
- Issue — raw material moves from the raw material store into WIP when the job starts (or when material is physically issued to the floor)
- Receipt — finished goods move from WIP into the finished goods store when the job is confirmed complete
The WIP balance at any point is: opening WIP + issues − receipts − recorded scrap. If this figure does not match a physical count, you have an unrecorded event to investigate — and the system gives you a narrow window to look at rather than the entire factory.
Integration With Inventory and Accounting
Wei Yot previously worked at AutoCount before joining Result Marketing. One of the recurring friction points he saw: factories with good physical stock control but no way to push the three-stage picture into their accounts without manual journals.
A linked inventory and warehouse system pushes each stock movement as an accounting entry automatically. Raw material consumed becomes cost of production. Finished goods receipted become inventory value. The WIP balance appears on the balance sheet as a real number derived from transactions, not an estimate.
What Good Looks Like
A manufacturer with three-stage tracking in place can answer these questions from the system, not from memory:
- What raw materials are currently on hand, by bin location?
- Which production orders are open and how much WIP is tied up in each?
- What finished goods are ready to ship, by batch and location?
- What was the scrap rate for the last 30 production runs of Product X?
These are basic operational questions. Surprisingly few Malaysian SME manufacturers can answer all four quickly.
For more on how we build inventory systems for manufacturers, visit /industries/manufacturing.
FAQ
How does WIP inventory tracking affect my year-end stock take?
It reduces the effort significantly. When WIP is tracked by production order, your auditors can reconcile book stock to physical stock by order, not by guessing which stage each pile of material is at.
Can the system handle batch or lot traceability within WIP?
Yes. Each raw material batch that enters production can be traced through to the finished goods lot it produced. This is particularly important for food, pharmaceutical, and regulated-goods manufacturers.
We already use AutoCount for stock — do we need a separate system?
AutoCount handles accounting stock well but is not designed for real-time WIP tracking on the factory floor. A manufacturing layer sits alongside AutoCount and pushes completed transactions into it, so your accounts stay accurate without double entry. Read more about our inventory and warehouse system.
If your stock variances keep appearing but investigations go nowhere, the answer is usually WIP visibility. Chat with us on WhatsApp — we can map your current stock flow in the first call.