ACC1701B Chap.7 Inventory and Cost of Sales
Inventory and Cost of Sales
Ownership comes before valuation
Inventory work begins by identifying goods the company controls. Physical location alone is not decisive: goods in transit may belong to the buyer or seller depending on the transfer terms, and goods held on consignment remain inventory of the consignor. Resolve ownership at the reporting date before counting units or applying prices.
A flawless cost schedule still misstates assets and profit if it begins with the wrong population.
Cost flow allocates one pool
Beginning inventory plus purchases forms cost available for sale. A cost-flow assumption allocates that same pool between cost of sales and ending inventory. FIFO assigns older costs to goods sold first and leaves more recent costs in ending inventory.
Weighted average combines the available costs into an average unit amount. The assumption need not reproduce the physical movement of each item, but the quantities and total available cost must reconcile under every permitted method.
Rising costs change the statement pattern
When unit costs rise, FIFO normally assigns older, lower costs to expense and newer, higher costs to ending inventory.
Compared with weighted average, this can produce lower cost of sales, higher gross profit, higher inventory and higher equity. The method does not create or remove total cost; it changes when the cost appears as expense.
Before comparing margins across businesses or years, identify the method and whether it changed.
Recoverability caps the asset
Cost cannot remain on the statement of financial position above the amount expected to be recovered. Net realisable value reflects the expected selling amount after costs required to complete and sell the goods.
If that amount falls below cost, reduce inventory and recognise the write-down in profit. Cash does not change at adjustment. Apply the comparison at the level supported by the facts rather than offsetting an impaired item with an unrelated unrealised gain.
Turnover opens a question
Inventory turnover relates cost of sales to average inventory, while days in inventory converts the rate into time.
Higher turnover can indicate efficient movement or stock shortages; lower turnover can indicate weak demand, excess purchases or a deliberate service buffer. Pair the ratio with gross margin, stock availability, write-downs and demand evidence. The accounting equation supplies a final control: cost available must equal cost of sales plus ending inventory.
What this chapter covers
- 01
Inventory ownership
- 02
Periodic and perpetual systems
- 03
FIFO cost layers
- 04
Weighted-average cost
- 05
Net realisable value
- 06
Inventory turnover
- 07
Method consistency and contextual interpretation of inventory speed
- 08
Ownership decisions for transit and consignment
Worked example · free
Reconcile FIFO layers
- 2Compute units available.
- 2Allocate FIFO cost.
- 2Reconcile total cost.
- 2Apply NRV.
Key terms
- FIFO
- A cost-flow assumption assigning earliest costs to sales first.
- Inventory Turnover
- Cost of sales divided by average inventory, indicating how often inventory cycles.
Inventory and Cost of Sales FAQ
Does FIFO require the physical oldest unit to sell first?
No. FIFO is a cost-flow assumption and may differ from physical movement unless specific identification is used. It assigns older available costs to expense before newer cost layers.
What happens when ending inventory is overstated?
Cost of sales is understated, so profit, assets and equity are overstated by the same pre-tax amount. The error reverses in a later period if the overstated goods are then sold.
Is higher turnover always better?
No. Higher turnover can reflect efficient movement or insufficient stock. Interpret it with sales growth, gross margin, stock availability and write-down evidence before deciding whether operations improved.
Exam move
Start every inventory problem with a quantity and ownership schedule. Mark goods in transit and consignments before assigning any unit cost so valuation does not legitimise the wrong population. Build separate columns for date, units, unit cost and total layer cost. Under FIFO, remove the oldest available layers in order; under weighted average, calculate the average from the complete cost pool required by the question.
Reconcile beginning inventory plus purchases to cost available, then prove that cost of sales plus ending inventory equals that same total. If quantities agree but dollars do not, inspect a layer price or average calculation rather than changing the count. Add a rising-cost comparison that states the direction of cost of sales, inventory, gross profit and equity under each method.
Next apply net realisable value item by item using expected selling amount less completion and selling costs, and trace a write-down through inventory, profit and cash. Keep turnover practice separate from valuation arithmetic: define the numerator and average denominator, compute days, and give both an efficiency and a stock-shortage interpretation.
During mixed review, alternate ownership, allocation, recoverability and ratio questions so the order of decisions remains visible. Finish each solution with the total-cost equation and one sentence naming the business evidence needed to interpret the inventory result.
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