Gross margin, for SaaS and for e-commerce

Gross margin is what is left of revenue after the cost of delivering it, before any of the costs of running the company. It is the ceiling on everything else: a business with a 40% gross margin has 40 cents per dollar to pay for sales, engineering, rent and profit. For the definition, benchmarks by model and the mistakes that distort it, see gross margin and its dollar counterpart gross profit.

The formula never changes. Gross margin = (Revenue − Cost of goods sold) ÷ Revenue. What changes, completely, is what belongs in that cost line — which is why the calculator above has two modes instead of one box.

What counts as cost of revenue for software

A software company's cost of revenue is what it spends to keep the product delivered to paying customers: hosting and infrastructure, the support and customer-success time that keeps them running, and third-party services the product depends on or resells.

What does not belong there is the engineering team building new features, sales, marketing or admin. Those sit below the gross margin line. Putting R&D into cost of revenue is the most common way a software company understates its own margin, usually by 10 to 20 points, and it makes every downstream comparison wrong.

Why e-commerce margin is a different calculation

For a physical product, the cost line is landed cost plus everything it takes to get the order to the customer, and then the part most calculators ignore: returns.

• Landed cost is the product plus freight, duty and inbound handling — not the supplier's invoice price.
• Fulfilment is pick, pack, packaging and outbound shipping. You pay it on every order, including the ones that come back.
• Payment processing is charged on the sale and refunded with it, so it follows kept revenue.
• Returns remove the revenue but not the fulfilment cost already spent, and recover the unit cost only to the extent the item can be resold.

That last point is why a 12% return rate costs far more than 12% of margin. The calculator models it explicitly: fulfilment is charged on every order placed, and returned stock is recovered only at the resellable share you enter.

Reading the number

These are ranges, not targets. The useful comparison is your own margin over time and against your own pricing, because the same 45% can be excellent for a reseller and a problem for an own-brand product.

The three mistakes that make the number wrong

1. Mixing cost and retail prices. Both sides of the calculation must be at cost. Comparing revenue against a retail-priced inventory figure inflates margin by roughly the margin itself.
2. Leaving returns out. Returns take revenue away and leave the fulfilment cost behind. A margin calculated on orders placed rather than orders kept is always too high.
3. Sliding costs between the lines. Moving support into operating expenses raises gross margin without changing a thing about the business. Decide where each cost belongs, write it into the chart of accounts, and leave it there.

Where Zinance fits

Gross margin is only as good as the ledger underneath it. If cost of revenue is not separated from operating expenses in the chart of accounts, the number cannot be produced reliably month to month. That separation is part of how we set books up — see bookkeeping, or e-commerce bookkeeping for the inventory and fulfilment side.

Frequently asked questions