Operating Expenses (OpEx)
What is Operating Expenses (OpEx)?
Operating Expenses (OpEx) are the ongoing costs of running the business that are not directly tied to producing goods or services (those are COGS). OpEx typically includes SG&A (Selling, General & Administrative expenses), R&D (Research & Development), and depreciation of operating assets. These costs appear on the income statement between Gross Profit and Operating Profit (EBIT).
OpEx is distinct from CapEx: CapEx is spending on long-lived assets (recorded on the balance sheet, expensed via depreciation), while OpEx is immediately expensed in the period incurred. This distinction matters for tax and for understanding the true cash cost of operating the business.
The relationship between revenue growth and OpEx growth is critical to understanding operating leverage. If revenue grows faster than OpEx, operating leverage is positive — margins expand. If OpEx grows faster than revenue (as in aggressive growth investments), margins compress. Most growth company financial models include explicit assumptions about when OpEx will scale more slowly than revenue.
When to use Operating Expenses (OpEx)
Analyse OpEx to understand cost structure and operating leverage. Break it into its components (SG&A, R&D) to understand where the business is investing. Track the OpEx-to-revenue ratio over time — declining ratios indicate improving efficiency; rising ratios require explanation (growth investment vs. cost inflation).
Worked examples
| OpEx component | Typical percentage of revenue | Nature |
|---|---|---|
| Sales & Marketing | 10% – 30% | Variable — scales with growth ambition |
| General & Administrative | 5% – 15% | Semi-fixed — scales slowly with size |
| Research & Development | 5% – 25% | Investment — varies by strategy |
| Depreciation (operating) | 1% – 8% | Fixed — tied to asset base |
Common pitfalls
Companies can temporarily suppress OpEx to boost short-term profitability — by reducing marketing spend, delaying R&D, or cutting headcount. This may improve margins in the short term but damage future growth. When analysing a company's track record, always assess whether margin improvement came from genuine efficiency or from deferred investment.
Frequently asked questions
What is the difference between OpEx and COGS?
COGS covers direct production costs that vary with output (materials, direct labour). OpEx covers overhead and period costs that do not directly scale with units produced (SG&A, R&D). COGS is deducted to arrive at Gross Profit; OpEx is deducted to arrive at Operating Profit.
Is depreciation an operating expense?
Yes, depreciation of operating assets (office equipment, leasehold improvements) is classified as an operating expense. Manufacturing equipment depreciation is often included in COGS. The classification depends on whether the asset is used in production or in overhead functions.
Why is OpEx versus CapEx an important distinction?
OpEx reduces profit immediately in the current period. CapEx does not — it creates an asset that is depreciated gradually. A company can shift spending between OpEx and CapEx to influence reported profit. Cloud computing has shifted many IT costs from CapEx (servers) to OpEx (subscriptions), affecting reported margins.