Operating Margin

What it is

Operating margin measures what percentage of revenue a company keeps after paying for the cost of its products and the expense of running the business — but before financing costs (interest) and tax. If a company generates £1 billion of revenue and reports £150 million of operating profit, its operating margin is 15%.

It's the number that most directly reflects whether a business has genuine pricing power, cost discipline, and operational leverage.

How to calculate it

Operating profit sits below gross profit (revenue minus direct costs) on the income statement, after deducting selling, general, and administrative expenses (SG&A), research and development, and other recurring operating costs. It is sometimes called EBIT — earnings before interest and tax.

What it tells you about competitive position

Operating margin is arguably the purest financial expression of competitive advantage. A business that can maintain a 25% operating margin over many years — through economic cycles, competitive challenges, and inflationary cost pressures — has something that cannot be easily replicated: either genuine pricing power (customers won't leave regardless of price), or cost advantages (it can produce for less than competitors), or both.

Businesses with strong brands and high switching costs tend to have structurally higher margins. LVMH operates at 25–30% margins. Diageo at 28–32%. Sage Group at 20–25%. These reflect decades of brand investment and customer loyalty that protects against commoditisation.

Conversely, thin-margin businesses in competitive industries — grocery retail, construction, travel — operate at 2–5% margins where a single bad quarter can tip them into loss. These businesses can still be good investments, but they require scale and operational precision to survive.

The margin expansion opportunity

One of the most powerful investment theses in equity analysis is margin expansion: a business improving its operating margin from, say, 10% to 15% over several years. The effect on profits is multiplicative — revenue might grow 5% per year while profits grow 12–15% as the margin base improves.

This can happen through:

• Pricing power being exercised as market position strengthens
• Mix shift toward higher-margin products or services
• Operational efficiency programmes (automation, shared services)
• Revenue growing faster than fixed costs (operating leverage)

A company that appears to be in a structurally improving margin trajectory deserves a premium P/E multiple. The market tends to underestimate how powerful margin improvement compounds over time.

Gross margin vs operating margin

Gross margin (revenue minus cost of goods sold) captures the profit on what the business makes or sells. Operating margin then deducts the cost of running the business. The gap between them is the SG&A ratio.

A company with 60% gross margin but only 10% operating margin is spending heavily on sales, distribution, and administration. That's not necessarily a problem — it may be investing aggressively in growth. But it does mean the business has high operating leverage: if revenue slows, those fixed costs don't disappear.

A company with 30% gross margin and 20% operating margin is running a lean operation with relatively modest overhead. These tend to be highly cash-generative businesses once they reach scale.

Sector benchmarks (approximate, UK/global, 2025)

Not financial advice. Margin analysis should always be considered alongside revenue quality and cash conversion.