Gross Margin

What it measures

The share of revenue that survives after paying the direct cost of delivering your product. It strips out R&D, sales, marketing, and admin overhead and isolates the variable costs that scale with each dollar earned. A 75% gross margin means you keep 75 cents of every revenue dollar to fund operating expenses and profit; the other 25 cents pays to deliver the service.

Why it matters

Gross margin tells you the health of your unit economics before you spend a penny on sales, marketing, or engineering. A 60% gross margin company can afford to spend more on CAC and still be profitable; a 40% one cannot. Investors scrutinize it to judge whether your model is scalable — high margin lets you fund growth without raising more capital, low margin traps you in a margin-versus-growth tradeoff. Operators use it to catch cost creep: are hosting, support, and payment fees staying proportional to revenue, or outrunning it? It also signals pricing power — raising prices without raising COGS lifts margin immediately.

How to read it

Read gross margin as: for every dollar of revenue, this is the percentage you keep to cover operating costs and profit. Track it monthly and compare to the prior month, your plan, and last year — never read a single snapshot in isolation. Improving margin means the business is getting more efficient: costs are shrinking or pricing is rising. Declining margin is a red flag — investigate whether COGS is rising (hosting, support, payment fees) or whether you are discounting to win deals. Decompose COGS into its components to see which cost is driving compression, and pair gross margin with CAC payback and LTV/CAC to judge whether your growth spend is sustainable.

What good looks like

Watch-outs

• Treating Gross Margin as profit. A 75% gross margin is not 75% profit — it is before operating expenses. Spend 40% of revenue on sales, marketing, and R&D and your operating margin is only 35%.
• Ignoring cost inflation by component. If your hosting bill rises 20% while revenue grows 10%, COGS outpaces revenue and margin compresses. Monitor each COGS line separately, not just the total.
• Mixing one-time and recurring COGS. Loading heavy onboarding or professional-services cost into a single period makes margin look artificially low. Separate variable recurring COGS (hosting, support) from implementation COGS.
• Forgetting that margin is a snapshot. One month can be distorted by timing — a large payment bill or a support spike. Use rolling 3-month or 12-month averages to read the real trend.

Worked example