Return on Equity is one of the most commonly tested financial metrics in banking, PE, and equity research interviews. It measures how effectively a company uses shareholders' capital to generate profit. This guide covers the formula, the DuPont decomposition, practical interpretation, and the interview questions you'll face.
What Is ROE?
Return on Equity measures the net income a company generates as a percentage of shareholders' equity:
ROE = Net Income / Shareholders' Equity × 100
If a company earns £20m of net income on £100m of equity, its ROE is 20%. This means the company generated £0.20 of profit for every £1 of shareholder capital invested.
ROE is a measure of capital efficiency. All else equal, a higher ROE indicates a business that's better at converting equity capital into profit.
'What's a good ROE?' There's no universal answer – it depends on the industry and capital intensity. Banks typically target 10–15% ROE. Capital-light tech companies can exceed 30%. Capital-intensive industrials might earn 8–12%. Compare ROE to the company's cost of equity: if ROE exceeds cost of equity, the business is creating value for shareholders. If it's below, the business is destroying value.
The DuPont Analysis
The DuPont framework decomposes ROE into three component drivers, which is far more useful than looking at the single ratio:
ROE = Net Profit Margin × Asset Turnover × Equity Multiplier
Or in formula terms:
ROE = (Net Income / Revenue) × (Revenue / Total Assets) × (Total Assets / Shareholders' Equity)
Each component tells you something different:
Net Profit Margin (Net Income / Revenue): How much of each pound of revenue the company keeps as profit. Driven by pricing power, cost control, and operating efficiency.
Asset Turnover (Revenue / Total Assets): How efficiently the company uses its assets to generate revenue. A high ratio means the company generates a lot of revenue per pound of assets.
Equity Multiplier (Total Assets / Shareholders' Equity): A measure of financial leverage. A higher multiplier means more debt relative to equity. This is where things get interesting – leverage can boost ROE without any improvement in underlying business performance.
How Leverage Affects ROE
This is the critical insight that interviewers test: leverage amplifies ROE in both directions.
Consider two identical businesses, both earning £10m EBIT on £100m of total assets. Company A has no debt (£100m equity). Company B has £60m debt at 5% interest and £40m equity.
Company A (no debt): Net Income ≈ £7.5m (after 25% tax). ROE = £7.5m / £100m = 7.5%.
Company B (60% leverage): Interest = £3m. Pre-tax income = £7m. Net Income ≈ £5.25m. ROE = £5.25m / £40m = 13.1%.
Company B has nearly double the ROE – not because it's a better business, but because it's using debt to amplify returns on a smaller equity base. If the business declines, that leverage amplifies losses just as aggressively.
'Company A has an ROE of 25% and Company B has an ROE of 12%. Is Company A a better business?' Not necessarily. If Company A is achieving 25% ROE through 5x leverage and Company B is achieving 12% ROE with no debt, Company B might actually be the stronger underlying business. Always decompose ROE using DuPont before drawing conclusions.
ROE vs ROCE vs ROA
ROE measures returns to equity holders only. It's affected by capital structure (leverage).
ROCE (Return on Capital Employed): Measures returns on all invested capital (equity + debt). Uses EBIT in the numerator and total capital employed in the denominator. Better for comparing companies with different capital structures.
ROA (Return on Assets): Net Income / Total Assets. Measures how efficiently all assets generate profit, regardless of how they're financed. Useful for comparing companies within the same industry.
The relationship: if a company has no debt, ROE ≈ ROA. As leverage increases, ROE rises above ROA (assuming the business earns more on its assets than it pays in interest).
Common Interview Questions
'How can a company increase its ROE?' Using DuPont: increase net margins (raise prices, cut costs), increase asset turnover (generate more revenue from existing assets), or increase leverage (take on more debt). The first two are fundamental improvements. The third is financial engineering.
'Why might a high ROE be misleading?' High leverage, one-time gains inflating net income, or a very low equity base (which can happen after large buybacks or accumulated losses). Always look at what's driving the number.
'How does a share buyback affect ROE?' Buybacks reduce equity (cash goes out, shares are retired). If net income stays the same, ROE increases because the denominator shrinks. This is why some companies use buybacks to 'manage' ROE – it's financial engineering, not operational improvement.
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