DuPont ROE Analysis
Split return on equity into margin, asset turnover, and financial leverage.
Driven mainly by asset efficiency. The DuPont split shows which of the three levers produced this return.
120 ÷ 1500 — how much of each unit of sales survives to the bottom line.
1500 ÷ 1000 — how much revenue each unit of assets generates. Retailers run high, capital-heavy firms low.
1000 ÷ 600 — assets funded per unit of equity. A multiplier of 1 means no debt at all; higher magnifies both gains and losses.
A high ROE built on leverage is not the same achievement as one built on margin. That is the whole point of the decomposition — two firms can report identical ROE for opposite reasons, and only one of them is resilient to a downturn.
DuPont analysis breaks ROE into three drivers: profit margin, asset turnover, and leverage. A firm earning 120 on 1,500 of revenue, with 1,000 of assets and 600 of equity, has an ROE of 20% — from an 8% margin, 1.5× turnover, and 1.67× leverage.
Same ROE, different companies
Return on equity is simply net income divided by equity, and on its own it tells you almost nothing about how a business works. Two firms can both report 20% ROE while operating in completely different ways — one earning fat margins on few sales, another earning thin margins on enormous volume, a third earning ordinary margins amplified by heavy borrowing.
The DuPont identity separates these. It multiplies revenue and assets into the ROE formula in a way that cancels out, leaving three meaningful ratios where there was one opaque number.
What each driver means
Net profit margin is pricing power and cost control — how much of each sale survives to the bottom line. Asset turnover is operational efficiency — how much revenue the asset base generates. The equity multiplier is leverage — how many units of assets each unit of equity supports, which is 1.0 for a debt-free firm and rises with borrowing.
The first two multiply to give return on assets, which measures the business itself. Leverage then scales that up. This is the key distinction: ROA reflects operating quality, while the gap between ROA and ROE reflects nothing but financing.
Revenue and assets cancel, leaving net income ÷ equity. The decomposition changes nothing arithmetically — it just makes the sources visible.
Worked example: 20% ROE
Compute each driver, then confirm they reproduce ROE:
- 1 Net profit margin. 120 net income ÷ 1,500 revenue = 8%. Eight cents of every sales dollar reaches the bottom line.
- 2 Asset turnover. 1,500 revenue ÷ 1,000 assets = 1.5×. Each dollar of assets generates 1.50 of sales.
- 3 Equity multiplier. 1,000 assets ÷ 600 equity = 1.67×. Assets are 1.67 times equity, so debt funds the rest.
- 4 Multiply the three. 0.08 × 1.5 × 1.667 = 0.20, or 20% ROE.
- 5 Cross-check directly. 120 ÷ 600 = 20%. The decomposition must reconcile, which is a useful arithmetic check.
- 6 Separate operations from financing. ROA is 8% × 1.5 = 12%. The remaining 8 points of ROE come purely from leverage.
Three routes to the same 20% ROE
Each column is a plausible business, and all three report identical ROE for entirely different reasons.
| Driver | Luxury brand | Discount retailer | Levered utility |
|---|---|---|---|
| Net profit margin | 20.0% | 2.5% | 8.0% |
| Asset turnover | 0.50× | 4.00× | 0.50× |
| Return on assets | 10.0% | 10.0% | 4.0% |
| Equity multiplier | 2.00× | 2.00× | 5.00× |
| Return on equity | 20.0% | 20.0% | 20.0% |
Why the distinction matters
Read the table's third column carefully. That firm has a return on assets of 4% — its underlying operations are less than half as productive as the other two — yet it reports the same 20% ROE because it carries five times its equity in assets. In a good year the leverage flatters it. In a downturn, the interest bill does not shrink with revenue, and the same multiplier works in reverse.
This is the practical use of DuPont: when ROE improves, the decomposition tells you whether the business got better or merely borrowed more. An ROE rising on margin or turnover is genuine progress. An ROE rising purely on the equity multiplier is increased risk wearing the costume of improved performance.
Two technical notes. The figures here use period-end assets and equity; many analysts prefer averages of opening and closing balances, particularly where the balance sheet moved substantially during the year. And an extended five-step DuPont splits margin further into a tax burden, an interest burden, and operating margin, isolating how much of the result comes from tax planning versus operations.