Return on equity (ROE): formula, DuPont analysis and pitfalls

Return on equity (ROE) measures how much profit a company earns for each dollar of capital its shareholders have in the business, as recorded on the balance sheet. It is net income divided by shareholders' equity. A company that earns $15 a year on $100 of equity has an ROE of 15%.

ROE is popular because it speaks directly to owners: it is the accounting return on their stake. It is also one of the easiest ratios to misread. The denominator, book equity, is not the money shareholders paid in or what their shares are worth today. It is an accounting residual that shrinks every time a company buys back stock or pays a dividend, and can even turn negative. A very high ROE can therefore mean a superb business, a heavily indebted one, or one that has handed most of its equity back.

Apple Inc. is the textbook case. Its fiscal 2025 ROE was 171.4%. This page shows how that number is built, splits it into three drivers with DuPont analysis, and explains when a high ROE deserves applause and when it is a warning.

The formula

Net income is earned over a whole year, while equity is a snapshot on one day. Averaging the opening and closing balance sheets matches the two better. Many data services divide by ending equity instead, which is simpler but distorts the result whenever equity changes a lot within the year. Apple's did: it rose from $56,950 million to $73,733 million.

For fiscal 2024 the same method gives 93,736 ÷ ((62,146 + 56,950) ÷ 2) = 157.4% on average equity. That year's net income was depressed by a one-time $10.2 billion tax charge, which the Profit margins: gross, operating and net margin explained page walks through.

DuPont analysis: three drivers of ROE

Finance staff at the DuPont company developed, early in the twentieth century, a way of breaking a return ratio into parts so managers could see which lever was moving it. The three-part version used today multiplies three ratios whose middle terms cancel out:

• Net margin is profitability: profit per dollar of sales.
• Asset turnover is efficiency: sales per dollar of assets.
• Equity multiplier is leverage: assets per dollar of equity. A multiplier of 5 means only one-fifth of the assets are financed by shareholders' equity; the rest by liabilities.

The split shows where the 171% comes from. A 27% net margin is high but not unique among large technology companies, and turning assets over 1.15 times a year is ordinary. The multiplier of 5.54 is the outlier. Without it (a multiplier of 1, meaning no liabilities at all) Apple's ROE would equal its return on assets, about 30.9%, covered in Return on assets (ROA): how to calculate and compare it.

A five-part DuPont version further splits net margin into a tax burden (net income ÷ pretax income), an interest burden (pretax income ÷ operating income) and operating margin. For Apple the tax burden is 112,010 ÷ 132,729 = 0.84 and the interest burden 132,729 ÷ 133,050 = 1.00, so neither changes the story.

Why buybacks inflate ROE

Shareholders' equity grows with net income and shrinks with dividends and repurchases. Apple returns almost everything it earns. In fiscal 2025 its equity went from 56,950 to 73,733 after adding 112,010 of net income and 13,246 of stock-based compensation, but subtracting 90,052 of repurchased stock and 15,413 of declared dividends. The Statement of shareholders’ equity: reading Apple’s equity roll-forward page lays out the full roll-forward.

Each buyback dollar leaves the numerator untouched (except for lost interest on the cash) while cutting the denominator by a dollar. So ROE rises.

That does not make the buybacks good or bad; Stock buybacks: how share repurchases work and what they do covers how to judge them. It means Apple's ROE mainly records a capital-return policy. It says much less about how the business compares with one that kept its earnings.

When a high ROE is a warning

The equity multiplier rises with any liability, including borrowed money. A company that borrows to fund operations or buybacks can lift ROE without earning more on its assets.

So read every high ROE alongside the Debt-to-equity ratio: formula, versions and when it misleads and Interest coverage ratio: can earnings pay the interest bill?. Apple's leverage is mostly from operating liabilities such as supplier payables, and its $98.7 billion of debt is less than its $132.4 billion of cash and securities. Company B's high ROE would rest on borrowed money that must be serviced.

Negative equity: when ROE stops working

If a company has bought back or paid out more than its accumulated earnings and paid-in capital, or has piled up losses, its book equity can fall below zero. Then ROE breaks down:

• A profitable company with negative equity shows a negative ROE, which reads as if it were losing money.
• A loss-making company with negative equity shows a positive ROE, two negatives multiplying to a positive.
• As equity crosses zero the ratio swings toward infinity, so even small changes produce huge numbers.

Several large, mature US companies with steady cash flow have run with negative book equity for years after heavy buybacks. For them, analysts drop ROE and use return on assets or Return on invested capital (ROIC): NOPAT, capital and WACC, which keep a positive denominator. Apple's equity has stayed positive, but its accumulated deficit of $14.3 billion shows how far down the buybacks have pushed the retained-earnings column.

How to read ROE

• Compare within an industry. Banks run high equity multipliers by design; asset-heavy utilities earn modest margins. As a rough rule of thumb, mid-teens ROE is often treated as solid for a company with moderate leverage. A reading above about 40% almost always has a balance-sheet explanation worth finding.
• Track it for five or more years. A steady ROE built on stable margins means more than a spike from one big write-down that shrank equity.
• Run the DuPont split. If ROE rose, find out which factor did it. Margin and turnover gains come from the business. Multiplier gains come from financing.
• Pair it with price-to-book. ROE and the Price-to-book ratio (P/B): book value, buybacks and ROE share a denominator. Apple's P/B of about 51 at the end of fiscal 2025 is the same low-equity story told from the price side.

Comparison: ROE versus its neighbours

The three return ratios side by side are drawn on the Return on assets (ROA): how to calculate and compare it page.

How Finabase does it

The summary page for a stock, for example Apple, lists Return on equity in Key statistics. It is a trailing-twelve-month figure passed through from the data provider, so its denominator and period may differ from the fiscal-year calculation above.

The Valuation tab shows ROE in its Profitability group as a ten-year annual chart, alongside ROA and ROIC, from FMP data. Its "Financial health" card also includes an FMP rating whose sub-scores include ROE. To rebuild the ratio yourself, the Financials tab has Net Income and shareholders' equity rows, annual or quarterly; click a row to chart its history and watch equity shrink through the buyback years. Finabase's screener does not filter on ROE.

Frequently asked questions

What is a good return on equity?

It depends on the industry and on leverage. Mid-teens is often treated as solid for a moderately financed company, but always check the DuPont split: a high ROE from borrowing is riskier than one from margins.

Why is Apple's ROE over 100%?

Because its shareholders' equity is very small relative to its profit. Apple has bought back far more stock than its retained earnings, leaving $73.7 billion of book equity against $112.0 billion of fiscal 2025 net income.

Should I use average or ending equity?

Use average equity when the balance changed a lot during the year, because it matches a full year's profit to the capital in place across that year. Apple's ROE is 171.4% on average and 151.9% on ending equity.

Can ROE be negative?

Yes, in two ways: a company with positive equity can lose money, or a profitable company can have negative equity. In the second case the ratio is not meaningful, and ROA or ROIC is the better gauge.

Summary

Return on equity divides net income by shareholders' equity, preferably the average of the opening and closing balances. DuPont analysis splits it into net margin, asset turnover and the equity multiplier, which shows whether a high reading comes from the business or from the balance sheet. Apple's fiscal 2025 ROE of 171.4% is mainly a multiplier of 5.54, the product of years of buybacks that kept book equity small. Treat any very high ROE as a question, check leverage and coverage before reading it as quality, and switch to ROA or ROIC when equity is tiny or negative.