A percentage starts the explanation, not ends it
IAS 1 provides a general presentation structure for financial reporting; IFRS 18 introduces specified new subtotals with mandatory application for annual periods beginning on or after January 1, 2027, with early application permitted. Sources: curr-stat-ias1, About; curr-stat-ifrs18, About. When comparing different periods, check the actual presentation rather than assuming that the same label always means the same base.
A simple price-and-cost bridge
A fictional company sells 100 units at 20 with unit cost 12. Revenue is 2,000, gross profit is 800 and gross margin is 40%. In the next period it sells the same 100 units at 22, while unit cost rises to 14. Revenue is 2,200, gross profit remains 800 and margin is 36.3636%.
Profit in currency units did not change, but its share of revenue fell. The price increase did not increase gross profit because costs rose at the same time. Looking only at revenue growth would be too favourable; looking only at the percentage could hide the unchanged absolute result.
Mix can change the average without improving products
Suppose one product has a higher margin than another. Increasing the first product’s share can raise total margin even when each product’s price and cost are unchanged. To explain the movement, decompose it into price, volume, mix and cost. If data are insufficient, do not call the residual difference precise “pricing power”: it may contain several factors at once.
Inventory cost basis also matters. IAS 2 connects recognition of the carrying amount of sold inventories as an expense with the period of related revenue and provides for write-downs. Source: curr-stat-ias2, About, final paragraph. A write-down can change gross profit without a corresponding fall in cash sales in the same period. This is another reason to read cost movements rather than only the average selling price.
Important expenses remain below gross profit
A company may preserve gross margin while increasing selling, administrative and debt-service expenses. Operating or net margin then changes differently. If net profit improves because of a one-off gain or tax item, do not call it improved operating efficiency without explanation. Reconcile the full chain from revenue to the selected result.
A common error is to say margin rose “by five percent” when it moved from 20% to 25%. The difference is 5 percentage points; the relative increase in the percentage itself is 25%. These quantities differ. Always state whether the comparison concerns points, relative change or absolute profit.
What counts as sufficient verification
Compare like-for-like periods, perimeter, expense composition and accounting principles. Separately note items where gross profit is not presented in the familiar production pattern. Financial institutions and trading models may require a different frame; there is no universal “good margin” level here.
This guide helps build an explanation of change, not a forecast of a company’s price. Continue with the [income statement guide](/guides/income-statement/), [peer comparison](/guides/peer-comparison/) and [return on sales](/glossary/rentabelnost-prodazh/).
Test good and bad periods symmetrically
If an analyst excludes unusual costs when profit falls, favourable periods should be examined for unusual income with the same care. Otherwise “sustainable margin” selects the most favourable presentation every year. Keep the original measure and each adjustment on separate lines. Readers can then reconstruct and accept or reject the analytical basis.
For companies with several products, first compare margin within each business and then the change in shares. Without that step, a mix effect is easily mistaken for improved pricing or lower cost. If detail is unavailable, state several possible explanations; do not turn one convenient explanation into an established fact.
Finally, compare the percentage with capital employed and the cash cycle. A high margin may come with long collection periods or large inventory, while a low margin may turn quickly and use a different financing model. This guide does not combine everything into a universal ranking. It shows why margin is one description of economics that must be supplemented with resource use and cash access before judging business quality.