The goods have reached the warehouse, but the supplier invoice is not the whole story of what it took to obtain them. Freight, insurance, handling and preparation may follow. Recording only the purchase price can make products look more profitable than they are. Loading every shipment-related payment into inventory creates the opposite problem: period expenses can disappear into an asset awaiting sale.
The task is not to attach as many invoices as possible to an item record. It is to explain each cost: what service did the business receive, and why was it needed to bring the goods to their present location and condition? IAS 2 connects inventory cost with purchase, conversion and other qualifying costs for that purpose. Applying that principle starts with the underlying evidence, not merely the account name.
One shipment, two apparent margins
Consider an illustrative shipment of 500 units with a gross purchase price of SAR 40,000. The supplier grants a SAR 2,000 trade discount. Inbound freight costs SAR 2,500, and handling needed to receive the goods costs SAR 500. Assume these amounts relate to the entire shipment, with no non-recoverable taxes or additional costs in this example.
| Component | Amount in SAR |
|---|---|
| Purchase price before discount | 40,000 |
| Trade discount | −2,000 |
| Freight to the warehouse | 2,500 |
| Receiving handling | 500 |
| Combined cost | 41,000 |
| Unit cost: 41,000 ÷ 500 | 82 |
Selling 100 units for SAR 110 each produces revenue of SAR 11,000 and a cost of goods sold of SAR 8,200. Gross profit is therefore SAR 2,800 before other expenses. Using only the net supplier price of SAR 76 per unit would show gross profit of SAR 3,400. The SAR 600 difference is not better trading performance: it is the sold units' omitted share of freight and handling.
The remaining 400 units carry a cost of SAR 32,800 before any subsequent impairment assessment. Reconciling those amounts also helps detect duplicate charges, such as freight included in unit cost and then charged again to cost of sales without justification.
Why a unit count may be the wrong allocation base
That simple division becomes misleading when a shipment contains unlike products. A carton of heavy equipment and a carton of light accessories might contain the same number of units but consume different amounts of transport capacity. Weight or volume may better explain freight, while insured value may better explain insurance. Choose a base that reflects the service and available evidence, apply it consistently and document the reason.
Imagine SAR 3,000 of freight shared by two product groups. If one group accounts for 70% of the weight used in the allocation, assigning SAR 2,100 to it and SAR 900 to the other is understandable and reproducible. Changing the allocation base each month merely to improve a particular product's reported margin destroys comparability.
A late invoice still has consequences
Some units may be sold before the final freight invoice arrives. The shipment file should distinguish provisional costing from completed costing. When the document arrives, review the difference and its relationship to units still held and units already sold, considering the accounting policy and relevant reporting period. Do not automatically place the entire adjustment in remaining inventory simply because that is easier in the software.
Use a shipment reference to connect the supplier invoice, receiving record and service invoices. Record the allocation base and associated quantities, then reconcile the total allocated cost to the approved amounts. This traceability is more useful than a long spreadsheet that nobody can independently recalculate.
Paying an amount alongside a shipment does not by itself make that amount an inventory cost. Separate payment approval from accounting classification, and assess tax recoverability before including tax in an item's cost.
When a product's margin changes while buying and selling prices appear stable, ask for an explanation. The sales mix may genuinely have changed, or freight costing may still be incomplete. Finding the cause improves pricing decisions; asking sales staff to reduce discounts cannot repair an incomplete accounting number.
Sources & further reading
Visit the original source to explore the concept and its wider context.
General educational content. Appropriate treatment depends on your business and accounting policies; consult your accounting professional when applying it to business records.
