Operating margin is the percentage of revenue remaining after deducting both COGS and operating expenses, representing the profitability of core business operations before interest and tax. It measures how efficiently management converts revenue into operating profit and is a key FP&A performance metric.
Formula
Operating Margin = (Operating Profit / Revenue) x 100In Depth
Operating margin, calculated as EBIT divided by revenue, is perhaps the most useful profitability metric for FP&A teams because it reflects factors within management's direct control. Unlike net profit margin, which is influenced by financing decisions and tax strategies, operating margin isolates operational efficiency.
The formula is: Operating Margin = (Operating Profit / Revenue) x 100, or equivalently EBIT / Revenue x 100. A company with £10M revenue and £1.5M operating profit has a 15% operating margin.
Operating margin improvement is a primary focus for FP&A teams. There are two levers: increasing gross margin (better pricing, lower input costs) or reducing operating expenses as a percentage of revenue (scaling efficiency). The latter is often described as operating leverage — the ability to grow revenue faster than operating costs.
For SaaS businesses, the "Rule of 40" combines revenue growth rate and profit margin (typically operating or EBITDA margin) to assess performance. A company growing at 30% with a 10% operating margin scores 40 — considered good. A company growing at 10% needs a 30% operating margin to reach the same threshold.
FP&A teams should track operating margin by segment, product line, and geography to understand where the business is most and least efficient. This analysis often reveals significant margin differences that inform strategic resource allocation.
UK-specific factors affecting operating margin include employer National Insurance contributions (13.8% above the threshold), the Apprenticeship Levy (0.5% of payroll for companies with pay bills over £3M), business rates, and statutory pension obligations.
Real-World Example
A UK B2B software company tracks operating margin monthly. At £2M ARR, the operating margin is -15% (burning cash to grow). By £5M ARR, margin reaches 5% as revenue scales faster than costs. The FP&A team models that at £8M ARR, operating margin should hit 18% based on the current cost structure, demonstrating the operating leverage inherent in the SaaS model.
Related Terms
Gross margin is the percentage of revenue remaining after deducting the cost of goods sold (COGS). E...
Operating expenses (OpEx) are the ongoing costs incurred in running a business's day-to-day operatio...
EBIT (Earnings Before Interest and Tax), also known as operating profit, measures a company's profit...
Net profit margin is the percentage of revenue that remains as profit after all expenses, interest, ...
Contribution margin is the amount remaining from revenue after deducting variable costs. It represen...
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