What Is Return on Equity (ROE)?
Return on equity measures how efficiently a company turns shareholders' capital into profit. It takes the bottom-line earnings available to common shareholders and divides them by the equity those shareholders have invested and retained in the business.
ROE is one of the most quoted profitability metrics because it speaks directly to owners: for every dollar of equity, how many cents of profit did management produce this year?
Formula
The formula is ROE = Net Income / Shareholders' Equity, usually expressed as a percentage. Many analysts use average equity over the period to smooth out mid-year changes from buybacks or share issuance.
The DuPont framework breaks ROE into three drivers: profit margin, asset turnover, and financial leverage. This decomposition matters because a high ROE can come from a genuinely great business or simply from piling on debt, and the DuPont analysis tells you which.
Example
Suppose a company earns $150 million of net income on $1 billion of shareholders' equity. Its ROE is $150 million / $1,000 million = 15%. If the company borrows to buy back shares and equity falls to $750 million while net income stays at $150 million, ROE rises to 20%, but the improvement came from leverage rather than better operations.
Why It Matters
Over long horizons, a company that compounds equity at a high ROE tends to create far more shareholder value than one earning low returns, which is why quality-focused investors screen on it. Consistently strong ROE relative to peers often signals a durable competitive advantage.
In equity research and investment banking interviews, being able to walk through the DuPont breakdown of ROE, and to explain how leverage inflates it, is a classic test of whether a candidate truly understands financial statements.
