DuPont Analysis: Breaking Return on Equity into Margin, Turnover, and Leverage
October 29, 2026
Return on equity (ROE) measures how much profit a company earns for each dollar of shareholders' equity: net income ÷ equity. A high ROE looks attractive, but it can arise from very different sources. The DuPont analysis splits ROE into three drivers: ROE = net profit margin × asset turnover × equity multiplier, where net margin = net income ÷ sales, asset turnover = sales ÷ total assets, and the equity multiplier = total assets ÷ equity (a measure of financial leverage).
For a company with a net margin of 10%, an asset turnover of 1.5, and an equity multiplier of 2.0: ROE = 0.10 × 1.5 × 2.0 = 30%. The three terms multiply because the intermediate quantities cancel: (NI/Sales) × (Sales/Assets) × (Assets/Equity) = NI/Equity.
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Open the Percentage Calculator →Two Companies, Same ROE, Different Stories
Company A is a supermarket chain with a thin net margin of 2%, but high asset turnover of 5.0 and an equity multiplier of 3.0: ROE = 0.02 × 5.0 × 3.0 = 30%. Company B is a luxury brand with a net margin of 20%, asset turnover of 0.75, and equity multiplier of 2.0: ROE = 0.20 × 0.75 × 2.0 = 30%. Both earn 30%, but A earns it through efficiency and volume with moderate leverage, while B earns it through high margins. A third company, C, has a margin of 4%, turnover of 1.0, and an equity multiplier of 7.5: ROE = 30%, achieved mainly through heavy debt, which is riskier.
The decomposition shows where the strengths and weaknesses lie.
| Company | Net margin | Asset turnover | Equity multiplier | ROE |
|---|---|---|---|---|
| A (supermarket) | 2% | 5.0 | 3.0 | 30% |
| B (luxury brand) | 20% | 0.75 | 2.0 | 30% |
| C (highly leveraged) | 4% | 1.0 | 7.5 | 30% |
| D (our example) | 10% | 1.5 | 2.0 | 30% |
Diagnosing a Change in ROE
Suppose a company's ROE falls from 30% to 24%. DuPont analysis tells you why. If margin fell from 10% to 8% (with turnover and leverage unchanged), costs or prices are the issue: 0.08 × 1.5 × 2.0 = 24%. If turnover fell from 1.5 to 1.2, assets are not generating enough sales, perhaps due to excess inventory or unused capacity. If leverage fell from 2.0 to 1.6 because the company paid down debt, ROE fell but risk fell too. Management can then focus on the right problem, by raising prices, controlling costs, improving inventory management, or reconsidering the capital structure.
Extended Versions and Cautions
The five-step DuPont breaks net margin into the tax burden (net income ÷ pretax income), interest burden (pretax income ÷ EBIT), and operating margin (EBIT ÷ sales), isolating the impact of taxes, financing costs, and operations. Use it carefully: leverage boosts ROE but increases the risk of distress when conditions worsen. A very high ROE can be the result of small or negative equity after share buybacks. Compare ROE with peers in the same industry, since asset intensity differs widely, and look at multi-year trends. Accounting choices influence margins and asset values.
Using It Personally
The same logic applies to a household: return on net worth depends on the profitability of your assets, the efficiency of using them, and your leverage. A homeowner who puts 20% down earns the home's return multiplied by about 5 (before costs), which magnifies both gains and losses. Understanding the drivers helps in decisions about debt and investments.
Frequently Asked Questions
What is the DuPont formula?
ROE = net profit margin × asset turnover × equity multiplier.
What does the equity multiplier measure?
Financial leverage: total assets divided by shareholders' equity.
Why decompose ROE?
To see whether returns come from margins, efficiency, or debt.
Is a higher ROE always better?
Not if it results from excessive leverage or shrinking equity.
What is asset turnover?
Sales divided by total assets, a measure of how efficiently assets generate sales.