Gross Margin and Net Margin are both expressed as percentages of revenue, both commonly tracked, and easy to conflate — but they answer two genuinely different questions about a business, and reading them together reveals things that neither number shows on its own.
What each number actually measures
Gross Margin (Gross Profit divided by Revenue) answers whether the core product or service itself is priced and costed correctly — it only accounts for revenue and the direct cost of delivering what was sold. Net Margin (Net Income divided by Revenue) is the broader question: once every operating expense is included, not just direct costs, is the business actually profitable.
What it means when the two numbers disagree
A healthy Gross Margin paired with a weak Net Margin is one of the more common and specific patterns to watch for — it points toward operating expenses growing faster than the business needs them to, rather than a pricing or product-cost problem. The fix in that situation is almost always in the expense structure, not in what's being charged for the core product.
What it means when both numbers are declining together
When Gross Margin and Net Margin trend downward together, the issue is usually upstream — pricing that hasn't kept pace with rising costs, or a cost of goods sold that's crept up without a corresponding price adjustment. That's a different conversation than an operating-expense problem, and conflating the two often leads to cutting the wrong thing.
Why a single month rarely means much on its own
Both margins fluctuate for ordinary reasons — a large one-time expense, a slow sales month, timing of a bulk purchase. A trend sustained across three or more consecutive months is the signal actually worth acting on; a single off month is usually just noise.