What Is ROE? A Plain-English Guide for Canadian DIY Investors

Return on equity (ROE) measures how much profit a company earns for each dollar of shareholders’ equity. It’s one of the most quoted quality metrics — and one of the easiest to misread, because debt, buybacks and write-downs can push it up without the business getting any better.

Educational glossary entry — not a recommendation. Examples are hypothetical.

Direct answer

ROE = net income ÷ average shareholders’ equity (for common shareholders, use net income available to common ÷ average common equity). A 15% ROE means the company earned $15 for every $100 of book equity over the year. Higher is generally better if it comes from margins and efficient use of assets rather than from leverage, and if it’s sustainable. Compare ROE with peers in the same industry and over several years; for banks, read it alongside P/B and capital ratios.

The DuPont breakdown

Hypothetical	Company A	Company B
Profit margin	15%	25%
Asset turnover	0.5×	0.05×
Leverage (assets ÷ equity)	2×	12×
ROE	15%	15%

Same ROE, very different risk: Company B’s return depends heavily on leverage, which is normal for a bank and alarming for most industrial businesses.

When ROE misleads

Situation	What happens to ROE	Check instead
Heavy debt	Inflated by leverage	Net debt / EBITDA, ROIC
Large buybacks	Equity shrinks, ROE rises	Per-share growth, ROIC
Write-downs or accumulated losses	Tiny or negative equity makes ROE meaningless	Use ROIC or return on assets
One-time gains	Net income spikes	Adjusted or multi-year average ROE
Acquisitive companies	Goodwill inflates equity, ROE looks low	Return on tangible equity

How Canadian DIY investors use it

• Banks and insurers: ROE is a primary lens; it drives what P/B multiple a bank deserves. See valuation for banks: P/B, ROE and why P/E alone fails and bank operating metrics.
• Quality screens: a multi-year ROE floor is a common filter — see screener literacy.
• Cross-checks: pair ROE with free cash flow and leverage before calling a business “high quality”.

By the numbers in the filings: net income is on the income statement; equity on the balance sheet (average the opening and closing balances). Many Canadian banks report ROE in their quarterly results — check how each defines it, since some use adjusted net income.

Media credits

• Hero: “Water mill wheel at Allerford - geograph.org.uk - 3736159.jpg” by M J Richardson, CC BY-SA 2.0, via Wikimedia Commons. Cropped and resized to 1280×720. Real photograph, not AI-generated.

By Andrew · stocksummarizer.com