Two ways to frame the question
IAS 1 provides for comparative amounts and includes notes in the complete set of statements. Source: **curr-stat-ias1**, About. Adjacent columns nevertheless do not become comparable for every analytical conclusion automatically. Restatement, acquisition, period changes and classifications require separate checks. Preserve those qualifications instead of erasing them for a smooth chart.
Illustrative revenue and expense structure
In period one, a fictional company has revenue of 1,000, cost of sales of 700 and gross profit of 300. In period two, revenue is 1,200, cost of sales is 900 and profit is 300. Revenue rose 20%, cost of sales rose 28.5714%, gross profit did not change in amount, and its share fell from 30% to 25%.
This set does not prove that purchasing prices caused the result: mix, accounting estimates or business structure may have changed. It does pose a precise question: why did expenses grow faster than sales? Looking only at revenue growth misses it; looking only at margin decline can miss the stable absolute profit.
Choose a sensible denominator
Assets are often used as the total base for balance-sheet structure and revenue for expenses, but the question determines the choice. Short-term debt as a share of all liabilities differs from short-term debt as a share of assets. Both can be useful if labelled. Do not change the denominator silently between periods and interpret the result as a business change.
When the base is zero or negative, ordinary percentage change loses its usual meaning. Describe a move from loss to profit with absolute amounts and causes rather than publishing an impressive percentage with a negative denominator. A small starting amount can also produce a huge rate from a minor absolute change.
Perimeter and restatement
IFRS 10 describes a consolidated group as one economic unit. Source: **curr-stat-ifrs10**, About. If a large business was acquired during the year, consolidated sales growth may reflect the new perimeter. Organic analysis needs separate comparable data. Do not subtract a convenient acquisition estimate and present the remainder as confirmed organic change.
IAS 8 distinguishes policy changes, estimate changes and error corrections. Source: **curr-stat-ias8**, About. If comparative amounts were restated, retain them beside the originally published figures and state which base is used. A common error is to take the beginning of a series from an old publication and the end from a new set without marking the different basis.
A practical protocol
Prepare a passport: period, duration, currency, scale, perimeter, comparative-data edition and line definitions. Then show absolute change, relative change and share in an aligned base. For material deviations, find an explanation in the notes; call the unexplained part a limitation rather than hiding it in a broad sentence.
This material sets no sector norm and does not prove causes through arithmetic alone. Continue with [financial-statement roadmap](/guides/financial-statements-roadmap/), [peer comparison](/guides/peer-comparison/) and [income statement](/guides/income-statement/).
Show the low-base effect separately
If a measure nearly disappeared in a bad year, a return to its usual level can produce an enormous growth rate. The percentage may be mathematically correct, but it does not by itself show a long-term record or durable acceleration. Add absolute amounts and a longer comparable series. Do not choose the starting year merely because it makes the chart persuasive; the base period should follow the analytical question.
Scale also matters in a vertical table. A lower expense share may reflect rapid growth in the denominator rather than lower spending. If sales later return to their former level, the result structure may look different. Read relative and absolute data together rather than taking turns to support the most favourable explanation.
In automated processing, preserve the original unit. Thousands and millions, half-year and full-year, separate and consolidated forms can have nearly identical headings. Check the line passport before searching for an economic story. Technical incompatibility often creates a dramatic jump that disappears after alignment. Correct analysis begins with this unglamorous but necessary check.