DuPont Analysis: How to Decompose Return on Equity

Apple (AAPL) and Walmart (WMT) both earn strong returns on equity — but for opposite reasons: one prints roughly 25% net margins, the other survives on about 2.5% and makes it up on sheer volume. DuPont analysis is the tool that tells them apart.

What is DuPont analysis?

DuPont analysis is a method for breaking return on equity into its underlying parts so you can see why a company earns the returns it does. It was popularized by the DuPont Corporation in the early twentieth century as a way to diagnose performance.

Return on equity on its own is just net income divided by shareholders' equity. It tells you how much profit a company generates per dollar of equity — but not how it got there.

DuPont fixes that blind spot. It shows whether a strong ROE comes from pricing power, operational efficiency, or simply piling on debt.

A raw ROE number tells you the destination; DuPont tells you the route — and the route is what determines how durable the return really is.

How do you calculate the three-step DuPont formula?

You multiply three ratios together. The classic three-step DuPont formula is:

ROE = Net Profit Margin × Asset Turnover × Equity Multiplier

Each piece answers a different question. Net profit margin (net income ÷ revenue) measures profitability. Asset turnover (revenue ÷ total assets) measures how efficiently assets generate sales. The equity multiplier (total assets ÷ shareholders' equity) measures leverage.

Walk through a simple example. If a company has a roughly 10% net margin, an asset turnover of about 1.0, and an equity multiplier of around 2.0, its ROE is 0.10 × 1.0 × 2.0 = 20%.

There is also a five-step version that further splits margin into tax burden, interest burden, and operating margin. That extended form isolates how much of the return comes from operations versus financial engineering — useful when comparing companies with very different tax or debt profiles.

For the broader context on how these ratios fit together, our fundamental analysis hub covers the full toolkit.

What does DuPont look like for real companies?

The power of DuPont shows up when you compare businesses that reach similar returns by completely different paths. The figures below are approximate and rounded to illustrate the mechanics, not exact filings.

Look at Apple (AAPL) versus Walmart (WMT). Apple earns its return on fat margins; Walmart earns a respectable one on razor-thin margins and blistering asset turnover of roughly 2.4 times.

Now look at Microsoft (MSFT) versus Coca-Cola (KO). Microsoft's ROE of about 35% is built on high margins and very little leverage — an equity multiplier near 2. Coca-Cola reaches a similar zone partly through leverage, with a multiplier closer to 4.

Same ballpark ROE, very different quality: Microsoft's comes from the business, while a bigger slice of Coca-Cola's comes from the balance sheet.

What are the most common DuPont mistakes?

The most common mistake is treating a high equity multiplier as a good thing. Leverage boosts ROE in good times, but it also amplifies losses and adds financial risk. An ROE of 40% built on a multiplier of 6 is not the same as 40% built on a multiplier of 2.

A second mistake is ignoring buybacks. When a company like PepsiCo (PEP) repurchases stock, it shrinks its equity base, which mechanically raises both the equity multiplier and ROE — even if the underlying business did not improve.

A third mistake is comparing across industries without adjustment. Retailers naturally run high turnover and thin margins; software firms run the opposite. DuPont is most useful comparing a company to its own history and to direct peers, not across unrelated sectors.

When should you NOT use ROE or DuPont?

Do not use ROE when shareholders' equity is negative or near zero. Aggressive buybacks can push equity below zero — Home Depot (HD) has at times carried negative book equity — and when the denominator goes negative, ROE becomes mathematically meaningless.

DuPont is also weak for banks and insurers, whose balance sheets are dominated by financial assets and regulatory capital rules. For lenders, return on assets and return on tangible common equity usually tell a cleaner story.

Finally, be careful with young or cyclical companies. A firm with volatile or negative earnings will produce erratic ROE figures that swing wildly year to year, making the trend more noise than signal.

For situations where ROE breaks down, pair it with other tools — our guide to investment strategies covers complementary metrics like return on invested capital.

Pro tips for using DuPont like an analyst

Track the components over time, not just the headline ROE. A rising ROE driven by expanding margins is a healthy signal; the same rise driven by a climbing equity multiplier is a warning that the company is levering up.

Compare the equity multiplier to industry norms. If a company's ROE looks great but its leverage is far above peers, you are being paid for taking on balance-sheet risk, not operational excellence.

Use DuPont to interrogate quality. Investors profiled in our super-investors guide — Buffett chief among them — prize high returns on equity that come from durable margins and light debt, precisely because those returns tend to persist.

Finally, cross-check ROE against return on invested capital. When the two diverge sharply, leverage is usually doing the heavy lifting, and that is exactly what DuPont is built to reveal.

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