Profitability ratio analysis in QCE Accounting Unit 4
“Calculate and interpret profitability ratios (gross profit margin, net profit margin, return on owner's equity, return on assets) to evaluate business performance and inform decisions”
Profitability ratios measure how well a business turns sales and resources into profit. Gross profit margin = gross profit / net sales, showing the trading margin before operating costs. Net profit margin = net profit / net sales, showing the percentage of sales kept after all expenses. Return on owner's equity = net profit / average owner's equity, showing the return the owner earns on their investment. Return on assets = net profit / average total assets, showing how efficiently assets generate profit. Ratios are interpreted by comparing across time (trend), against competitors or against industry benchmarks. A single ratio means little alone; analysis links movements to causes (pricing, cost control, asset use) and to decisions.
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Check against your course. The 2025 QCAA Accounting syllabus describes Unit 4 as the complete accounting processes for a trading GST business and the performance analysis of a public company, with ratios that include EBITDA, earnings per share, price earnings, dividend yield and cash flow ratios. This page covers part of that ground, so check your school's materials for the full list of what is assessed.
What this dot point is asking
QCAA wants you to evaluate how profitable a business is using ratio analysis. You must calculate the key profitability ratios from a set of financial statements, interpret what each ratio means, compare results against prior years or benchmarks, and use the analysis to make and justify decisions about the business.
What profitability ratios do
Profitability ratios express profit relative to the resources used to generate it (sales, equity, assets). They turn raw dollar figures into comparable percentages so that performance can be tracked over time and compared between businesses of different sizes. Each ratio answers a specific question about where profit comes from.
Gross profit margin
Gross profit margin = (Gross profit / Net sales) x 100
This is the percentage of each sales dollar left after the cost of goods sold, before operating expenses. A margin of 45% means 45 cents of every sales dollar covers operating costs and profit. The ratio reflects pricing, purchasing efficiency and product mix. A falling gross profit margin signals rising supplier costs, discounting, or theft and inventory loss.
Net profit margin
Net profit margin = (Net profit / Net sales) x 100
This is the percentage of sales remaining after all expenses. It reflects both the trading margin and how well operating expenses are controlled. If the gross profit margin holds steady but the net profit margin falls, operating expenses (wages, advertising, finance costs) have grown faster than sales.
Return on owner's equity
Return on owner's equity (ROE) = (Net profit / Average owner's equity) x 100
where average owner's equity = (opening equity + closing equity) / 2.
ROE shows the return the owner earns on the money they have invested in the business. It is the headline measure for an owner, because it can be compared with the return available from alternative investments. A business returning 18% on equity is rewarding the owner well if comparable investments return less.
Return on assets
Return on assets (ROA) = (Net profit / Average total assets) x 100
ROA shows how efficiently the business uses its assets to generate profit, independent of how those assets are financed. A business with a high ROA squeezes more profit out of each dollar of assets. Comparing ROA with ROE reveals the effect of borrowing: when ROE exceeds ROA, borrowed funds are earning more than they cost, which lifts the owner's return (favourable gearing).
Interpreting and using the ratios
A ratio in isolation says little. Meaningful analysis compares:
- Over time (trend): is the ratio improving or deteriorating across years?
- Against competitors or industry benchmarks: how does the business compare with similar firms?
- Against the owner's expectations or alternative investments.
Analysis then links the movement to a cause and a decision. A falling net profit margin might lead to a decision to review pricing or cut discretionary expenses. A strong ROE might justify reinvesting profit to grow. The ratios are tools for decisions, so an exam answer should always interpret, not just calculate.
The data
Harbour Trading reports for the year:
Net sales $400,000; cost of goods sold $240,000; net profit $48,000. Owner's equity was $200,000 at the start and $240,000 at the end. Total assets were $300,000 at the start and $340,000 at the end.
Gross profit margin
Gross profit = 400,000 - 240,000 = $160,000.
(160,000 / 400,000) x 100 = 40.0%
Net profit margin
(48,000 / 400,000) x 100 = 12.0%
Return on owner's equity
Average equity = (200,000 + 240,000) / 2 = $220,000.
(48,000 / 220,000) x 100 = 21.8%
Return on assets
Average total assets = (300,000 + 340,000) / 2 = $320,000.
(48,000 / 320,000) x 100 = 15.0%
Interpretation
The business keeps 40 cents of gross margin and 12 cents of net profit per sales dollar. ROE (21.8%) comfortably exceeds ROA (15.0%), so the business is using borrowed funds favourably, the owner's return is amplified by debt that earns more than it costs. The owner should compare the 21.8% ROE against alternative investments before deciding whether to reinvest.
- Using closing equity or assets instead of the average
- Return ratios use average equity or average assets across the period for a fair comparison with profit earned over that period.
- Calculating gross profit margin on net profit
- Gross profit margin uses gross profit (sales minus cost of goods sold), not net profit.
- Quoting ratios without interpretation
- Marks come from explaining what the movement means and what decision follows, not just the percentage.
- Confusing ROA and ROE
- ROA measures profit against assets; ROE measures profit against the owner's equity. The gap between them reveals the effect of gearing.
Exam-style questions
Questions in the style of QCAA exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Practice4 marksUsing Stimulus 2 and 3 and your responses to Questions 12a) and 12b), calculate the following ratios for 30 June 2024: gross profit ratio, net profit ratio, return on owner's equity, and current ratio. Calculations should be rounded to two decimal places. [Health Foods: net sales $60 000, gross profit $43 000, net profit $7 418, current assets $19 800, current liabilities $5 290, owner's equity (closing) $45 310.]Show worked answer →
One mark per ratio. State the formula, substitute, and round to two decimal places.
Gross profit ratio = gross profit / net sales x 100 = 43 000 / 60 000 x 100 = 71.67%.
Net profit ratio = net profit / net sales x 100 = 7 418 / 60 000 x 100 = 12.36%.
Return on owner's equity = net profit / owner's equity x 100 = 7 418 / 45 310 x 100 = 16.37%. (Use closing owner's equity of $45 310, being opening capital $39 892 plus net profit $7 418 less drawings $2 000.)
Current ratio = current assets / current liabilities = 19 800 / 5 290 = 3.74:1.
Note that the gross profit and net profit ratios are well below the industry benchmarks (75% and 30%), showing cost of goods sold and expenses are high relative to sales, while the current ratio of 3.74:1 is comfortably above the 2:1 benchmark.
Practice10 marksRead Case study 2 (Stimulus 9 to 10) in the stimulus book. Analyse and evaluate the performance of The Motel Company to propose two recommendations to improve the profitability of the company. [Stimulus figures, 63.49m fair value gain on investment properties; 2022 industry benchmarks: gross profit ratio 47.28%, net profit ratio 21.65%.]Show worked answer →
Calculate the profitability ratios, interpret the trend against the prior year and the industry benchmark, then give two justified recommendations.
Gross profit ratio = gross profit / sales x 100. 2022 = 36.59 / 91.31 x 100 = 40.07% (down from 50.86 / 89.56 = 56.79% in 2021). This is below the 2022 industry benchmark of 47.28%, indicating cost of sales has risen sharply relative to sales.
Net profit ratio = profit for the year / sales x 100. 2022 = 25.11 / 91.31 x 100 = 27.50% (down from 87.24% in 2021, though 2021 was inflated by a large fair value gain on investment properties of $63.49m, not trading performance). The 2022 net profit ratio of 27.50% is still above the benchmark of 21.65%.
Evaluation: trading profitability has weakened, driven mainly by the falling gross profit ratio. Two recommendations to improve profitability, each justified:
- Review cost of sales (renegotiate supplier costs or adjust room pricing) to lift the gross profit ratio back toward the 47.28% benchmark, because the gap between the gross and net profit margins shows the problem starts at the gross level.
- Reduce or control the largest operating expenses (for example employee and other expenses) so more gross profit converts to net profit, and avoid relying on one-off fair value gains to prop up reported profit.
Markers reward correct ratio calculations, comparison to the prior year and benchmark, and two recommendations that follow logically from the analysis.