Operating Expenses vs COGS

The income statement is built top-down: Revenue minus COGS equals Gross Profit, then minus Operating Expenses equals Operating Income (EBIT). COGS is the first deduction because it's directly tied to the units sold — if a company sells 100 widgets, COGS is the cost of making those exact 100 widgets. OpEx comes next: these are the costs you'd incur whether you sold 100 widgets or 80 — the sales team, the headquarters lease, the R&D lab. This ordering is why gross margin (Gross Profit / Revenue) measures production efficiency, while operating margin (EBIT / Revenue) measures total operating efficiency.

COGS includes raw materials, direct labor (factory workers building the product), inbound freight, and manufacturing overhead like factory utilities and equipment depreciation. For a services business, COGS (often called 'cost of revenue') is the cost of the people directly delivering the service plus hosting/infrastructure. OpEx includes SG&A (executive salaries, corporate rent, legal, accounting), sales and marketing, and R&D. The trickiest item is depreciation: equipment used to make the product is depreciated into COGS, while the corporate office building is depreciated into OpEx. This is why EBITDA adds back D&A from both buckets.

The same total cost can produce wildly different gross margins depending on classification, which is why bankers scrutinize the split when comparing companies. A SaaS business that puts customer-support engineers in COGS will report a lower gross margin than a competitor that buries them in OpEx — even if the businesses are economically identical. In a comparable companies analysis, you must normalize these classifications before trusting margin comparisons. Operating leverage also shows up here: COGS tends to scale with revenue (variable), while much of OpEx is fixed, so a growing company sees OpEx shrink as a percent of revenue.

Software companies have minimal COGS (just cloud hosting and support), driving 70-90% gross margins, but heavy OpEx in R&D and sales. Manufacturers and retailers have large COGS (materials, inventory) and gross margins of 20-40%. A grocery chain might run a 25% gross margin but a razor-thin operating margin after labor and rent. Understanding the typical structure for an industry lets you spot anomalies — an unusually high gross margin for a manufacturer might signal aggressive cost capitalization or a reclassification of costs into OpEx.