What is Return on Equity (ROE)? Definition, Formula, and Example
Return on equity measures how much profit a company generates for every dollar of shareholder equity, calculated as net income divided by shareholders' equity.
What Is Return on Equity?
Return on equity (ROE) measures how efficiently a company converts shareholders' invested capital into profit. It answers a direct question: for every dollar shareholders have tied up in the business, how many cents of profit does the company generate per year? A high ROE signals a business that doesn't need much capital to grow — it can reinvest earnings at a high rate of return rather than raising new equity or debt. ROE is the core metric behind Warren Buffett's preference for capital-light, high-margin businesses over capital-intensive ones with the same growth rate.
Return on Equity Formula
ROE = Net Income ÷ Shareholders' Equity
Shareholders' equity (also called book value) comes from the balance sheet — total assets minus total liabilities. Analysts often use *average* equity (beginning-of-period plus end-of-period, divided by two) rather than a single point-in-time figure, since equity moves throughout the year from buybacks, dividends, and retained earnings. ROE is also decomposed via the DuPont formula to show what's actually driving it:
ROE = Net Profit Margin × Asset Turnover × Equity Multiplier (leverage)
The DuPont breakdown matters because two companies can post identical ROE for very different reasons — one from superior margins, another from simply carrying more debt (leverage inflates ROE by shrinking the equity denominator without improving the underlying business).
Worked Example: Apple's Return on Equity
AAPL's fiscal 2024 (ended September 28, 2024) balance sheet reported:
- Net income: $93.74 billion
- Total shareholders' equity: $56.95 billion
ROE = $93.74B ÷ $56.95B ≈ 164.6%
That figure is not a typo, and it's a textbook DuPont case: Apple's ROE is inflated far above what its margins alone would produce because more than a decade of aggressive buybacks has shrunk its equity base while net income kept growing. A "normal" high-quality large-cap ROE runs 20-30%; Apple's number is a leverage-and-buyback artifact, not proof the underlying business is 5x more efficient than peers.
When Traders Use Return on Equity
ROE is a first-pass quality screen — value and quality investors use a floor (commonly 15-20%) to filter for capital-efficient businesses before doing deeper diligence. It's used to compare companies within the same industry where capital intensity is roughly comparable, since ROE without industry context is close to meaningless (a bank's normal ROE range looks nothing like a software company's). ROE also feeds directly into the PEG ratio and DCF-adjacent valuation work, since a business earning a high, durable ROE can compound book value faster and justify a premium multiple.
Limitations of Return on Equity
ROE can be artificially inflated by leverage or buybacks — as the Apple example shows, a shrinking equity base mechanically pushes ROE up even if net income is flat, which means a rising ROE isn't automatically a sign of an improving business. It's also distorted by one-time items in net income (asset sales, tax adjustments, litigation settlements) that don't reflect recurring earnings power. Negative shareholders' equity — common for companies that have bought back more stock than their retained earnings, or that are unprofitable and burning through equity — makes the ratio undefined or nonsensical (a negative ROE from negative equity looks identical on the surface to a negative ROE from a genuine net loss). ROE also ignores the composition of that equity — no adjustment for cash sitting idle versus equity actively deployed in the business.