Why shrinkage matters to a first-time founder
Lost stock reduces the amount you can sell without reducing the cash already spent buying or making it. If you do not measure shrinkage, your inventory records, gross margin and reorder decisions become unreliable. Tracking it helps you spot theft, damage, supplier shortages and recording errors before they become expensive patterns.
Examples of shrinkage
A shop records 1,000 headphones in its system, but a physical count finds only 970. Ten were damaged, five were stolen and 15 cannot be explained. The missing 30 units create a 3% shrinkage rate by quantity, prompting the founder to improve receiving checks and storage controls.
Common misunderstanding
Shrinkage is not every fall in inventory. Stock sold to customers, deliberately discounted or recorded as obsolete has a known business reason. Shrinkage is the gap between recorded stock and stock actually present because items disappeared, were damaged or were counted incorrectly. Retail sales may also shrink for unrelated reasons.
When to use it
Measure it when you hold physical stock, especially after unexplained margin changes or mismatches between sales and inventory records. Compare regular physical counts with your system, investigate material differences and record known damage separately. A service business with no stock generally does not need an inventory shrinkage metric.