Closing inventory appears in more than one part of a simple trading business’s financial statements. It is an asset remaining at the reporting date, and it also affects the calculation of cost of sales.
That connection explains why an inventory valuation error can change both reported profit and assets. If closing inventory is overstated, cost of sales is understated and gross profit is overstated, assuming the other figures remain unchanged.
To understand the direction, begin with the flow of goods rather than memorising “higher inventory means higher profit.” This guide uses original simplified examples. For lessons on trading accounts and financial statements, see O Levels Accounting at Abeel Eschool.
Distinguish goods bought from goods sold
A business may buy goods during a year without selling every item by the year-end. Charging all of those purchases as the cost of goods sold would include goods that are still available for future sale.
Opening inventory consists of goods carried into the year. Purchases add goods acquired during the year. Closing inventory removes the goods still held at the end from the period’s cost-of-sales calculation.
In a simplified periodic system, cost of sales is opening inventory plus net purchases and relevant inward costs, less closing inventory. Use the exact components and adjustments required by the question.
Do not automatically include every business expense in inventory cost. Rent, selling costs and equipment purchases have different roles, and the exercise may state how particular costs should be treated.
Work through a simple cost-of-sales calculation
Suppose opening inventory is PKR 20,000 and purchases are PKR 80,000. Assume no purchase returns, carriage or other adjustments for this example. Goods available for sale at cost total PKR 100,000.
If closing inventory is PKR 10,000, cost of sales is PKR 20,000 + PKR 80,000 − PKR 10,000 = PKR 90,000.
With sales revenue of PKR 150,000, gross profit is PKR 150,000 − PKR 90,000 = PKR 60,000. Further operating expenses would then be considered in arriving at the appropriate profit figure.
The closing PKR 10,000 has not been ignored. It remains as inventory in the statement of financial position while being excluded from this period’s cost of goods sold.
Understand cost and net realisable value
In the introductory inventory rule commonly examined, inventory is valued at the lower of cost and net realisable value. Net realisable value is the expected selling price less the relevant costs of completion and sale.
Suppose an item costs PKR 800, is expected to sell for PKR 950 and requires PKR 100 of relevant selling costs. Its net realisable value is PKR 850. The lower amount is cost, so the inventory value is PKR 800.
Now suppose another item costs PKR 600, is expected to sell for PKR 550 and needs PKR 30 of relevant selling costs. Net realisable value is PKR 520, so the inventory value is PKR 520.
The expected selling price alone is not the same as net realisable value when further relevant costs must be deducted. Read what is needed to make the sale.
Do not recognise an unsold gain by marking inventory up
If an item’s expected net selling amount exceeds cost, the lower-of-cost-and-net-realisable-value rule does not increase inventory above cost in these examples.
The first item remains valued at PKR 800 even though its estimated net realisable value is PKR 850. The anticipated margin is not added to closing inventory merely because a higher selling price seems likely.
When net realisable value falls below cost, the lower amount is used. For the second item, the reduction from PKR 600 to PKR 520 reflects a write-down of PKR 80.
Do not offset an unsupported upward valuation of one item against a required reduction of another. Apply the grouping or item-by-item approach required by the question and the accounting framework being studied.
Apply quantities as well as unit values
An inventory question may provide units and per-unit figures. Calculate the appropriate value per unit, then multiply by the quantity held.
If ten identical units each have cost PKR 600 and net realisable value PKR 520, the total inventory value is PKR 5,200 under the lower-value rule. The total write-down from their PKR 6,000 cost is PKR 800.
A common mistake is to compare total cost with a per-unit net realisable value, or to apply the quantity twice. Label columns as unit cost, unit net realisable value, quantity and total valuation.
Check whether damage or a special selling cost applies to all units or only some. A mixed condition can require separate calculations for affected and unaffected stock.
Damaged and obsolete goods need realistic estimates
Goods may still exist physically while having a lower recoverable selling amount. Damage, deterioration, outdated designs or changing demand can reduce what the business expects to realise.
Use the estimate and completion or selling costs supplied in the exercise. Do not automatically value every damaged item at zero if it can still be sold for a positive net amount.
Equally, do not retain full cost simply because the original purchase invoice is available. The lower-value test considers whether that cost remains supported by net realisable value at the relevant date.
The purpose of the calculation is a realistic inventory valuation within the stated rules. It is not a prediction that every estimated selling price will necessarily be achieved.
Closing-inventory overstatement increases reported profit
Return to the simple trading example. Correct closing inventory is PKR 10,000, giving cost of sales PKR 90,000 and gross profit PKR 60,000.
If closing inventory is incorrectly recorded as PKR 14,000, cost of sales becomes PKR 86,000. Gross profit rises to PKR 64,000. Profit and inventory assets are each overstated by PKR 4,000, assuming all other figures and expenses remain unchanged.
Follow the calculation rather than treating the direction as a slogan. Closing inventory is subtracted in cost of sales, so a larger subtraction makes cost of sales smaller.
An understated closing figure has the opposite effect. If it were recorded as PKR 7,000, cost of sales would be PKR 93,000 and gross profit PKR 57,000 in the same simplified example.
Opening-inventory errors affect the next period differently
A closing-inventory balance normally becomes the following period’s opening inventory. An overstatement carried forward can therefore increase the next period’s cost of sales, all else equal.
Suppose opening inventory in the next year is overstated by PKR 4,000 while that year’s purchases and closing inventory are correct. Cost of sales is then overstated by PKR 4,000 and gross profit understated by PKR 4,000.
This is the opposite period effect from overstating the previous year’s closing inventory. It does not mean the original error is acceptable; each period’s statements can still be wrong.
When a question spans two years, label the year beside every balance. “Inventory error” is too vague to determine the effect without knowing whether the amount is opening or closing for the period being analysed.
A physical count and a valuation answer different questions
A physical inventory count establishes quantities under the procedures used. Valuation determines the amount assigned to those quantities. An accurate count does not ensure that every unit has been priced correctly.
The inventory record can also be wrong if goods are counted twice, omitted or included despite not belonging to the business under the stated facts. Read any information about goods held for others, ownership and transaction timing.
For an O Level exercise, follow the ownership and cut-off details provided rather than inventing complicated conditions. Identify which goods belong in the closing inventory, then apply the relevant valuation to those goods.
A clear working separates quantity adjustments from value adjustments. Combining them too early can make it difficult to explain why the final balance changed.
Keep inventory distinct from equipment and supplies
A business’s goods for resale are inventory in the trading examples discussed here. A machine used to operate the business is generally a non-current asset instead of goods sold through normal trading.
The same physical object can have a different classification in a different business. A computer retailer may hold computers as goods for resale, while a tutoring business may use a computer as equipment.
Read the purpose for which the business holds the item. Classifying every purchase as inventory would distort cost of sales and the asset balances.
Likewise, do not assume all supplies are resale inventory. Follow the syllabus terminology and the question’s description of how the items are used.
Build a worksheet that reveals the direction of an error
Use separate columns for opening inventory, purchases, closing inventory, cost of sales and gross profit. Change one inventory figure while keeping the others fixed and observe the result.
For valuation questions, use another small schedule for cost, selling price, relevant further costs, net realisable value and the selected lower figure. Label quantities and units clearly.
Explain your result in a sentence: “Closing inventory is overstated by PKR 4,000, so cost of sales is understated by PKR 4,000.” That reasoning supports the final profit statement.
Use Abeel’s Cambridge past-paper guide to practise the calculation inside full questions. The parent progress guide can help focus a review on explained workings and corrected errors.
Choose the next practice task from your actual weakness
If your arithmetic is correct but the direction is wrong, rebuild cost of sales from goods available and goods remaining. If the lower-value rule is the issue, practise a few separate unit valuations before returning to a full statement.
If you confuse opening and closing figures, use two adjacent years on a timeline. Trace how one year’s closing balance becomes the next year’s opening balance.
Explore Abeel Eschool and its course catalogue for relevant learning options. Ask about Accounting coverage through admissions and FAQs, making your topic and intended examination session clear.
Frequently asked questions
What is net realisable value?
It is the expected selling price less the relevant costs of completion and sale. Use the amounts and assumptions supplied in the question.
Do I value inventory at selling price?
Not simply at selling price under the rule discussed here. Compare cost with net realisable value and use the lower appropriate amount.
Why does higher closing inventory increase gross profit?
Closing inventory is subtracted when calculating cost of sales. An overstatement reduces cost of sales and increases gross profit, all else equal.
Does a correct physical count prove the valuation is correct?
No. Quantities and valuation are separate checks. Prices, further selling costs and inclusion of the correct goods also matter.
Does opening-inventory overstatement have the same profit effect?
No. Opening inventory is added in cost of sales. An overstatement increases cost of sales and reduces gross profit for that period, all else equal.
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