Definition
Stock movement refers to any change in the quantity of inventory held by a business. This includes increases in stock (from purchases, returns from customers, or transfers in from another location) and decreases in stock (from sales, write-offs due to damage or expiry, theft, or transfers out). Tracking stock movement accurately gives the business a real-time view of its inventory position.
Automatic Stock Movements via POS
Every time a sale is processed through a POS system, the quantity of each sold item is automatically deducted from the inventory record, creating a stock movement entry. Every time a purchase order is received and verified, those quantities are added. These automatic movements form the majority of inventory activity in most businesses.
Manual Stock Movements
Manual stock movements are also required in some situations. A damage write-off removes units from inventory that are no longer sellable. A stock adjustment corrects an inventory count that does not match the physical stock after a stocktake. An internal transfer records stock moving from a warehouse to a store, or between two store locations.
Stock Movement History as an Audit Trail
Stock movement history provides an audit trail for every change in inventory. If stock levels are lower than expected, reviewing the movement history will reveal whether the discrepancy was caused by a series of small sales, a bulk return that was not entered correctly, or a gap in receiving that was not recorded.
Shrinkage and High-Value Inventory
Shrinkage is the term used for stock loss that cannot be attributed to a recorded movement. It results from theft (customer and employee), supplier short-delivery, administrative error, or product damage that was not written off at the time. Comparing theoretical stock to physical stock quantifies shrinkage and drives investigation.
For businesses managing perishable or high-value inventory, stock movement frequency matters as much as accuracy. A food business needs to know daily how much of a perishable ingredient was used, so that orders can be adjusted to match actual consumption rates.