Profitability & Returns: ROE, ROA & ROIC

Introduction

The income statement told us about margins — how much profit a company keeps from each pound of sales. That is useful, but it answers only half the question of how good a business is. A company can have lovely margins yet need vast amounts of capital to produce them — and capital is not free. The deeper measure of quality is not profit per sale but profit per pound of capital employed: the return ratios. These — return on equity, return on assets, return on invested capital — reveal how efficiently a business converts the money entrusted to it into profit, and they are among the most powerful tools for separating genuinely excellent companies from merely large ones.

This lesson builds on the income-statement and balance-sheet lessons, because return ratios marry the two — profit from the income statement, capital from the balance sheet. It explains the three main returns, the DuPont breakdown that exposes what really drives them, and the single most important idea in business quality: earning more than your capital costs.

Quick Definition

Return ratios measure a company's profit relative to the capital used to generate it — how efficiently it turns money into more money. The three most important are return on equity (ROE), return on assets (ROA) and return on invested capital (ROIC), each dividing profit by a different measure of the capital employed.

The shift in thinking is from "how much does it earn?" to "how much does it earn on what it uses?" A company earning £100m of profit sounds impressive — until you learn it took £2bn of capital to do it (a 5% return) versus a rival earning the same £100m on £400m (a 25% return). The second is a far better business, and only the return ratios reveal it.

Return On Equity (ROE)

The most widely cited return ratio, return on equity measures profit against the shareholders' own capital:

ROE = Net income ÷ Shareholders' equity.

It answers: for every pound the owners have in the business, how much profit does it generate each year? An ROE of 20% means the company earns £20 of profit annually for every £100 of equity — an excellent figure; a sustained ROE above ~15% generally marks a high-quality business. ROE is intuitive and powerful because, over time, a company that can reinvest its profits at a high ROE compounds shareholder wealth rapidly. But — and this is crucial — ROE has a flaw that the DuPont breakdown below exposes: it can be inflated by debt.

Return On Assets (ROA)

Return on assets widens the lens to all the assets the company uses, however they were funded:

ROA = Net income ÷ Total assets.

Because it divides by total assets rather than just equity, ROA is not flattered by borrowing — a company cannot boost its ROA simply by taking on debt. It measures how efficiently the business uses its entire asset base to produce profit, which makes it especially useful for comparing companies with very different debt levels, and for asset-heavy industries. A high ROA signals a business that squeezes a lot of profit from its assets; a low one, a capital-hungry business that needs a great deal of stuff to make a little money.

Return On Invested Capital (ROIC): The Gold Standard

Many analysts regard return on invested capital as the finest single measure of business quality. It compares the company's operating profit (after tax, before financing) to all the capital invested in the business — both debt and equity:

ROIC = Operating profit after tax ÷ Invested capital (debt + equity).

ROIC's virtue is that it captures the return on the entire capital base the business uses, and — unlike ROE — it cannot be flattered by leverage, because debt is in the denominator. It isolates the quality of the core operation: how well the business turns every pound of capital, whoever provided it, into profit. A consistently high ROIC is the hallmark of a wonderful business and, as we'll see in the moats lesson, is usually protected by some durable competitive advantage. It is the number to watch above all others.

The DuPont Breakdown: What Drives ROE?

A high ROE is good — but why is it high? The DuPont breakdown answers this by decomposing ROE into three distinct levers:

• Net profit margin — profit per pound of sales. A high margin signals pricing power or low costs.
• Asset turnover — sales per pound of assets. High turnover means the assets work hard (a supermarket); low turnover means capital-intensive (a steel mill).
• The equity multiplier (leverage) — assets per pound of equity, which rises with debt.

The lesson is profound. Two companies can report the same 20% ROE for completely different reasons. One might earn it through fat margins and efficient assets — genuine quality. The other might have mediocre operations but borrow heavily, using leverage to inflate the ROE — a flattering number masking real risk. The DuPont breakdown tells you which, and it is why ROE should never be admired in isolation: a high ROE built on debt is fragile, while one built on margins and efficiency is the mark of a great business. (This is precisely why ROIC, which strips out leverage, is the more reliable gauge.)

The Idea That Matters Most: Returns Versus The Cost Of Capital

Here is the deepest concept in all of business quality, and it reframes everything above. Capital is not free — providers of debt and equity demand a return for risking their money, called the cost of capital (often around 7–10% for a typical company). A business creates value for its owners only when its return on invested capital exceeds its cost of capital.

A company earning a 15% ROIC on capital that costs 8% is creating value — every pound it invests earns more than that pound costs to obtain, and the more it can reinvest, the more wealth it builds. A company earning 5% ROIC on 8% capital is destroying value — it would be better off returning the money to shareholders than reinvesting it at a loss, however fast it grows. This is the counter-intuitive truth that escapes many beginners: growth only creates value when the return on the invested capital beats its cost. A rapidly growing company earning sub-par returns is growing itself poorer; a slow-growing one earning high returns is quietly compounding wealth. Return ratios, measured against the cost of capital, are how you tell the difference.

What Good Looks Like

In practice, investors look for:

• High returns — a sustained ROIC and ROE comfortably above the cost of capital, ideally 15%+, year after year.
• Consistency — stable, durable returns rather than a single good year. Erratic returns suggest a volatile or commoditised business.
• Returns that beat the cost of capital — the only ones that actually build value.
• The source of the return — via DuPont, returns driven by margins and efficiency (quality) rather than leverage (risk).
• Durability — and, as the moats lesson explains, high returns that persist usually do so because a competitive advantage protects them from competitors who would otherwise compete them away.

Common Misconceptions

• "A high ROE always means a great company." It can be inflated by debt. Use the DuPont breakdown to see if the return comes from quality or leverage — and prefer ROIC, which debt can't flatter.
• "More profit means a better business." Profit relative to the capital used is what matters. A huge profit on an enormous capital base can be a poor business.
• "Growth always creates value." Only growth funded by returns above the cost of capital creates value. Growing while earning sub-par returns destroys it.
• "Return ratios are all I need." They measure quality powerfully, but say nothing about price. A wonderful business bought too dear is still a poor investment — pair returns with valuation.

Real-World Application

An investor compares two companies, both with a 20% ROE — on the surface, equally excellent. The DuPont breakdown tells a different story. The first earns its 20% through high margins and efficient assets, with little debt; its ROIC is a sterling 18%, comfortably above its ~8% cost of capital, and it has sustained these returns for a decade. The second earns its 20% ROE on thin margins by piling on debt — strip out the leverage and its ROIC is a mediocre 6%, below its cost of capital, meaning the business actually destroys value with each pound it reinvests; the high ROE is a leverage illusion masking a weak operation and real financial risk. Same headline figure, opposite realities. By looking through ROE to its drivers, and measuring the true operating return (ROIC) against the cost of capital, the investor identifies the genuinely high-quality compounder and avoids the leveraged mirage — exactly the discrimination that return ratios exist to provide.

Key Takeaways

• Return ratios measure profit relative to the capital employed — the deeper gauge of quality than margins, which only measure profit per sale.
• ROE (net income ÷ equity) is intuitive but can be inflated by debt; ROA (÷ total assets) isn't; ROIC (operating profit ÷ all invested capital) is the gold standard, hard to flatter with leverage.
• The DuPont breakdown splits ROE into margin × asset turnover × leverage, revealing whether a high return reflects genuine quality or risky borrowing.
• Value is created only when ROIC exceeds the cost of capital — so growth creates value only when the returns beat their cost; growing at sub-par returns destroys wealth.
• Look for high, consistent, leverage-free returns above the cost of capital — and remember return ratios judge quality, not price, so always pair them with valuation.