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ProfitabilityNPM

What is Net Profit Margin (NPM)?

Net Profit Margin measures the percentage of revenue that becomes profit after all expenses, taxes, and interest. It is the bottom-line profitability metric. Buffett favors companies sustaining net margins above 20% as evidence of pricing power and operational efficiency.

Formula

Net Profit Margin = Net Income / Revenue x 100

Why Net Margin Reveals Competitive Advantage

Net profit margin is the clearest single-number reflection of a business's ability to charge more than it costs to operate. A company with structural pricing power -- a beloved brand, a patent-protected product, a dominant distribution network -- can maintain high margins even as competitors try to undercut it. That is why Buffett uses sustained high margins as a screen for economic moats.

Margin analysis becomes most useful when tracked over time and compared to industry peers. A retailer running 4% net margin may be exceptional in its sector; the same 4% at a software company would signal deep problems. Always normalize for one-time items (asset sales, litigation settlements, restructuring charges) that inflate or deflate reported net income in any single period.

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Frequently Asked Questions

What is net profit margin?+
Net profit margin is net income divided by total revenue, expressed as a percentage. It tells you how many cents of profit a company keeps for every dollar of revenue after all costs -- including cost of goods sold, operating expenses, interest, and taxes -- have been deducted.
What is a good net profit margin?+
Benchmarks vary widely by industry. Software and SaaS companies typically achieve 20-30% net margins at scale. Consumer brands and established industrials range from 10-20%. Retailers commonly operate at 2-5% due to thin spreads and high volume. Airlines typically earn 0-5%, making them highly vulnerable to cost shocks. A margin consistently above 20% in any sector is a strong signal of pricing power.
What is the difference between net margin and operating margin?+
Operating margin excludes interest expense and income taxes -- it measures profitability at the business operations level, before capital structure affects the numbers. Net margin is fully loaded: it deducts all costs including financing costs and the full tax bill. Because operating margin is capital-structure neutral (a company with no debt and one with heavy debt can have identical operating margins), analysts prefer it for cross-company comparisons. Net margin is more relevant when evaluating returns to equity shareholders.
Why is rising revenue with falling net margin a warning sign?+
Scale should improve margins in most business models: fixed costs spread over more revenue units, purchasing power increases, and SG&A as a percentage of revenue typically shrinks. If a company is growing revenue but net margins are compressing, it means incremental revenue is being won at lower profitability -- through price cuts, in higher-cost geographies, or via products with structurally lower margins. This pattern signals the business lacks operating leverage and the moat may be narrowing.

Related Terms

Operating Margin

Profitability before interest and taxes

Return on Equity

Profit generated per dollar of shareholders equity

Gross Profit Margin

Revenue minus cost of goods sold

Return on Assets

Net income relative to total asset base

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