ROE
Return on Equity. Net income divided by shareholders' equity, measuring how efficiently a company turns shareholder capital into profit
ROE (Return on Equity) is net income divided by shareholders' equity, expressed as a percentage. It indicates how efficiently a company turns the capital provided by shareholders into profit, and is widely regarded as the central measure of equity returns. The average ROE for Japanese companies stands at roughly 9-10% as of 2024, significantly below the 18-20% average for U.S. companies. The TSE's 2023 request specifically targeted companies with sub-8% ROE for improvement.
Dupont Decomposition
ROE can be decomposed into three components: ROE = net margin × asset turnover × financial leverage. The first reflects core profitability, the second measures asset efficiency, and the third indicates how much total assets a company runs on each unit of equity. Two firms can both report 10% ROE through very different mixes - high margin × low leverage (a high-quality business) versus low margin × high leverage (a thin-margin operator) - so the composition matters at least as much as the headline figure.
ROE and the Cost of Equity
When ROE exceeds the cost of equity (a required return of roughly 8-10%), the company is creating shareholder value. When ROE falls below the cost of equity, shareholders would generally be better served by receiving cash via dividends or buybacks than by leaving it inside the company. Japan's persistently low ROE and traditionally lower payout ratios were the backdrop to the TSE's 2023 capital efficiency request, which has since prompted many large companies to undertake substantial buybacks, compressing equity to mechanically lift ROE.
Limitations and Cautions
ROE has several caveats. First, excessive leverage can superficially boost ROE - the high ROEs at financial institutions before the 2008 crisis are the classic example. ROE should be assessed alongside capital adequacy. Second, share buybacks reduce equity and thus mechanically lift ROE, but if underlying earnings are not improving, the change is accounting in nature rather than a genuine increase in enterprise value. Third, ROE is not meaningful for early-stage or loss-making companies; it is most useful as a measure of mature, profitable businesses with stable earnings.