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The metric that isolates a business's true operating profitability, before financing and tax effects — and why it's usually a more stable, reliable measure.
Operating Margin is operating profit (revenue minus direct operating costs, before interest and tax) divided by total revenue, as a percentage. It measures how much of every dollar of revenue remains as profit from the core business operations themselves.
Net margin (after interest and tax) is affected by a company's financing structure (how much debt it carries) and by tax rates that can shift year to year for reasons unrelated to business performance. Operating margin isolates the more important question: is the core business itself profitable, without the noise of financing decisions and tax accounting.
Operating margins that are stable or rising over time signal a real competitive advantage (pricing power, operational efficiency) — versus margins that gradually erode, which can point to rising competition or costs the company isn't able to pass on to customers.
Operating-margin stability is part of the Quality category (10% of the score) — together with ROIC, it checks whether a company is run with real efficiency, not just whether it's profitable at a gross level.
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The information in this guide is intended for general educational purposes only and does not constitute investment advice. Full details on the disclaimer page.