What Is Return on Equity (ROE)? How to Use It Properly

Written by Jim Norris · NorrisAI AlphaLens · Updated August 2026

Quick answer: Return on Equity (ROE) measures how much profit a company generates for every dollar of shareholders' equity — what's left of the business after subtracting all liabilities. A 20% ROE means the company earns $0.20 of profit for every $1 of equity capital. ROE is one of Warren Buffett's most-cited metrics for evaluating business quality, but it must be interpreted carefully: high ROE driven by leverage is very different from high ROE driven by genuine business superiority.

How ROE is calculated

ROE = Net Income ÷ Shareholders' Equity

Or expressed as an annual percentage: if a company earned $200 million in net income and has $1 billion in shareholders' equity, its ROE is 20%.

Return on Invested Capital (ROIC) is a related and often more useful metric — it measures return on all capital (debt plus equity), removing the effect of leverage. ROIC = Net Operating Profit After Tax ÷ (Debt + Equity). Comparing ROE and ROIC reveals how much of a company's apparent return is from genuine business economics vs financial leverage.

What high ROE actually signals

A company sustaining 20–25%+ ROE over many years without excessive leverage is demonstrating genuine competitive advantage — it's earning significantly above-market returns on the capital it employs. The sources of sustainably high ROE are the same as the sources of durable moats: brand strength, switching costs, network effects, or structural cost advantages that allow above-normal profitability.

This is why Buffett has called ROE — or more precisely, return on equity without unusual leverage or accounting gimmicks — the most important single metric for evaluating management and business quality.

The leverage problem with ROE

ROE can be artificially inflated by debt. Here's why: adding debt increases assets and therefore earnings (if the borrowed money earns more than its cost), while reducing equity (debt goes on the liability side, reducing the equity denominator). Both effects make ROE look better — without the underlying business improving at all.

A company with 40% ROE but a debt-to-equity ratio of 5x is a fundamentally different (and riskier) investment than one with 25% ROE and no debt. The high-debt company's ROE would collapse if interest rates rose or earnings fell.

The DuPont analysis decomposition — ROE = Net Margin × Asset Turnover × Financial Leverage — separates the three drivers of ROE and reveals how much comes from operational efficiency vs financial engineering.

Warren Buffett has written that his preference is for businesses that can sustain high returns on equity without the need for unusual leverage. The businesses that earn 20%+ ROE year after year without relying on debt are the ones compounding real value — the leverage just hides it or amplifies it temporarily. He views consistently high unlevered ROE as one of the strongest signals of durable competitive advantage.

ROE vs ROIC — which to use

For comparing companies with similar capital structures: ROE works well. For comparing companies with very different debt levels, or for understanding true economic returns: ROIC is superior. ROIC is also more relevant for capital allocation decisions — it directly measures whether reinvesting in the business creates or destroys value relative to the cost of capital.

A company with a 25% ROIC and a 10% cost of capital is creating substantial economic value with every dollar reinvested. One with a 9% ROIC and a 10% cost of capital is destroying value — better to return cash to shareholders than reinvest at below-cost returns.

Professor Aswath Damodaran of NYU Stern Business School places ROIC at the center of value creation analysis — a company creates value only when it earns returns above its cost of capital. ROE without this cost-of-capital comparison is incomplete. High ROE on cheap equity is still value-creating; high ROE on expensive equity might not be. — Investment Valuation, Wiley

Common ROE pitfalls

Comparing across sectors. Capital-light businesses (software, financial services) naturally achieve higher ROE than capital-intensive ones (manufacturing, utilities). Cross-sector comparison is misleading.

Ignoring the leverage source. Always check how much of ROE comes from financial leverage before drawing conclusions about business quality.

Single-year snapshots. A cyclical business may show exceptional ROE at the top of its cycle and poor ROE at the bottom. Multi-year average ROE through a full cycle is more informative.

How AlphaLens uses ROE and ROIC

The Management Quality Scorecard (framework #12) evaluates ROE and ROIC as primary measures of capital allocation effectiveness — did management earn above-cost returns on the capital they deployed? The Full Company Breakdown establishes the business model context. The Fair Value Stress Test uses sustainable ROIC assumptions as inputs to intrinsic value estimates. The DuPont decomposition is built into the earnings analysis to separate operational quality from financial leverage.

Where to go deeper

For a detailed walkthrough of each research framework, see the complete guide to all 15 AlphaLens frameworks.

For definitions of investing terms, see the AlphaLens investing glossary.