Why your stock count is always wrong, and what to do about it

You count the shelf, you check the app, and the numbers disagree. The instinct is to assume theft. Usually it is not. Stock drift almost always comes from a small number of ordinary causes, and identifying which one is yours is far more useful than counting more often.

The usual causes, roughly in order

• Sales recorded against the wrong item — two similar products, one barcode scanned by habit.
• Goods received but never entered, because the delivery arrived mid-rush.
• Partial deliveries recorded as complete, so the system believes you have stock the supplier still owes you.
• Breakage, expiry and samples given away, none of which are sales and none of which get recorded.
• Own use — items taken for the household and never rung through.
• Unit confusion, where an item is bought by box and sold by piece with no conversion.
• Theft, which is real but is usually the smallest of these.

Count a few items often, not everything rarely

A full stocktake once a year tells you that you are wrong, twelve months after it started going wrong. By then the trail is cold and there is nothing to learn.

Counting a handful of items every week is more work in total and far more useful, because a discrepancy is days old rather than months. You can still remember the delivery that came in wrong. Start with your fastest-moving and highest-value lines — the ones where drift costs the most.

Fix the cause, not just the number

When you find a discrepancy, resist correcting the count and moving on. The corrected number will be wrong again next month, because the reason is still there.

If two similar items keep getting confused, give them clearly different names or separate barcodes. If deliveries go unrecorded, record them against a purchase order so partial arrivals are visible. If breakage is the cause, record it as an adjustment so it appears in your costs rather than vanishing.

Low-stock alerts are a symptom check

Setting a reorder threshold per item is usually framed as an ordering tool, and it is. But it doubles as a drift detector: an item that hits its threshold much sooner than your sales rate suggests is telling you that stock is leaving without being recorded.

Accept a tolerance

No shop has perfect stock accuracy, and chasing it costs more than it saves. Decide what level of drift is acceptable for each category — tighter for high-value goods, looser for cheap fast-moving ones — and spend your attention where the money actually is.