# How Do You Keep Inventory Counts Accurate When a Shipment Arrives Short?

> Published: 2026-08-03
> Updated: 2026-08-03
> Author: Mathias Nielsen
> Category: Manage
> Canonical: https://finalpos.com/blog/keep-inventory-counts-accurate-short-shipment

A short shipment breaks your inventory records the moment someone receives it on faith. Here is the receiving routine that keeps counts accurate: check against the purchase order, count first, adjust the same day.

You keep inventory counts accurate by counting what actually arrived, comparing that count to what you ordered, and adjusting stock to the real number before anything reaches the shelf. The packing slip (the supplier's list of what they say they shipped) never sets your stock number. Your count does.

Short shipments are routine, not rare. Suppliers short cases, substitute sizes, split orders across deliveries, and occasionally just miscount. A store receiving a few deliveries a week will see all of these in a year. The stores that keep accurate counts anyway are the ones with a receiving routine that treats every box as wrong until someone proves otherwise.

## Why do short shipments corrupt inventory counts?

Because most small stores receive on faith. The delivery lands during a busy morning, someone glances at the packing slip, and the system gets credited with the full ordered quantity. If the supplier shipped 20 units against an order of 24, your POS now believes in four units that do not exist.

That is phantom stock (inventory your system shows but your shelf does not have), and it compounds:

- You oversell. Any channel that promises stock, from online orders to phone holds, is promising units you cannot deliver.
- Reordering stalls. The system thinks you are covered, so nothing flags for replenishment until the shelf is already empty.
- Shrink gets misdiagnosed. When a count finally surfaces the gap months later, the missing units look like theft, and the supplier's claim window closed long ago.

Theft gets the headlines, and it did account for about 65 percent of retail shrink (inventory lost to theft, damage, and error) in the NRF's 2023 security survey[¹](https://nrf.com/media-center/press-releases/shrink-accounted-over-112-billion-industry-losses-2022-according-nrf). That still leaves roughly a third of shrink coming from process failures and plain errors. Receiving on faith sits squarely in that bucket, and unlike theft, it is entirely under your control.

![Shop owner counting delivered cases at the back door against the purchase order](https://hy9joxwes0n0bta4.public.blob.vercel-storage.com/media/43399b6a-0d29-48b6-84dd-88ef01fcb193/generated/51f1bc676b316318-receiving-count-at-door-inline.png)

## What does proper receiving from a purchase order look like?

A purchase order, or PO (your record of exactly what you ordered and at what cost), is what turns receiving into a check instead of a guess. Without one, the packing slip grades its own homework: the supplier tells you what they shipped, and you have nothing independent to compare it against. Whether your PO lives in an ordering system, an email thread, or a spreadsheet, the routine is the same five steps:

1. Pull up the PO before opening a box. Receiving needs a source document you produced, not one the supplier did.
2. Count the physical goods without reading the quantities off the packing slip first. Knowing the "right" number nudges the counter toward finding it, the same blind-count principle behind [cycle counts](/blog/cycle-counts-vs-annual-inventory).
3. Compare all three numbers: what you ordered, what the slip claims, what is in the box. The pattern tells you what happened. Ordered 24, slip says 24, box holds 20: the order was short-picked, file a claim. Slip says 20: the supplier knowingly shipped short, so check for a back order before you pay for 24.
4. Adjust stock to the counted number, the same day.
5. Report the shortage while the claim window is open. Most suppliers set a deadline for shortage claims in their terms, and it is usually tight. Same-day reporting is the only habit that never misses it.

![Opening a delivery box with the packing slip on top before counting the contents](https://hy9joxwes0n0bta4.public.blob.vercel-storage.com/media/43399b6a-0d29-48b6-84dd-88ef01fcb193/generated/0a6e66d73b718efa-packing-slip-open-box-inline.png)

## What should you do the moment a shipment arrives short?

Separate the two problems a short shipment creates. There is a money problem (you paid, or are about to pay, for units you did not receive) and a data problem (your stock records are about to be wrong). Fix the data problem immediately and chase the money problem on its own timeline.

Adjust the count first. Then photograph the delivery, keep the packing slip, and note the counted quantity on it with a date and initials. That is your evidence for the supplier claim and your audit trail for the stock adjustment.

What you should not do is leave the system at 24 units while the dispute drags on. Every day the record stays wrong, checkout, reorder points, and reports are all working from fiction. A supplier credit makes you whole financially; it does nothing to fix your counts.

## How do you stop short shipments from wrecking counts long term?

Track each supplier's fill rate (the percentage of ordered units actually delivered). A supplier who consistently delivers 92 percent of what you order is giving you data: pad your order quantities, reorder earlier, or move volume elsewhere. You only see the pattern if every variance gets recorded at receiving.

Then keep the routine boring. One person receives each delivery, the same way, against the PO, every time. A five-minute check on every delivery beats a thorough audit on some. If stock also moves between your locations, the same mark-it-received discipline applies to [stock transfers](https://finalpos.com/help/transfer-stock-between-outlets).

Finally, back the routine with counting. Receiving discipline catches shortages at the door; scheduled cycle counts catch whatever slips past. None of it works if the number you are checking against is stale, which is the case for real-time stock tracking made in [From Stock Chaos to Control with POS Inventory Management](/blog/from-chaos-to-control-with-pos-inventory-management). In Final POS, stock on hand is tracked per outlet in the Merchant Hub, and [turning on stock tracking is one toggle when you add a product](https://finalpos.com/help/add-a-product), so the number you correct at the back door is the same live number checkout draws down.

![Empty shelf gap in a stockroom while a worker adjusts the stock count on a tablet](https://hy9joxwes0n0bta4.public.blob.vercel-storage.com/media/43399b6a-0d29-48b6-84dd-88ef01fcb193/generated/5d7e923cf86fd1f9-stock-adjustment-shelf-gap-inline.png)

## So, how do you keep inventory counts accurate when a shipment arrives short?

Count what arrived, check it against the purchase order rather than the packing slip, adjust stock to the counted number the same day, and chase the supplier credit as a separate problem. The rule of thumb: **the packing slip never sets your stock number; your count does.** If half these terms are new to you, start with [30 POS terms every new merchant should know](/blog/pos-terminology-30-terms-new-merchants).

## FAQ

**Q: What is phantom stock?**
A: Inventory your POS shows on hand that is not physically on the shelf. Short shipments received at the full ordered quantity are one of the most common causes, alongside unlogged damage and mis-scans.

**Q: What is the difference between a purchase order and a packing slip?**
A: A purchase order is your record of what you ordered and at what cost. A packing slip is the supplier's record of what they say they shipped. Proper receiving checks the physical delivery against your purchase order, not just the slip.

**Q: Should I adjust stock before the supplier resolves a shortage claim?**
A: Yes. Adjust to the counted number the same day so checkout, reordering, and reports stay accurate, and pursue the credit separately. A supplier credit fixes the money, not your counts.

**Q: What is a supplier fill rate?**
A: The percentage of ordered units a supplier actually delivers. Tracking it per supplier shows you who ships short repeatedly, so you can pad orders, reorder earlier, or move volume to a better supplier.

**Q: How long do I have to report a short shipment?**
A: Most suppliers set a claim window for shortages in their terms, and it is often short. Report shortages the same day you receive the delivery and you will never miss a window.