Net Profit Margin
Marge bénéficiaire nette in French
Quick definition
Net profit margin is the percentage of revenue left as profit after every cost has been paid: goods, overhead, interest and tax. It is the bottom line expressed as a share of the top line.
From the top line to the bottom line
Net profit margin is net profit divided by revenue. Getting to net profit means walking down the income statement, subtracting each layer of cost in turn. Here is the waterfall with round numbers for a business doing $500,000 in sales:
| Line | Amount |
|---|---|
| Revenue | $500,000 |
| Cost of goods sold | $300,000 |
| Gross profit | $200,000 |
| Overhead (rent, admin, wages) | $140,000 |
| Operating profit | $60,000 |
| Interest and income tax | $20,000 |
| Net profit | $40,000 |
Reading the number
In the example above, net profit margin is $40,000 divided by $500,000, or 8%. Each layer of the waterfall has its own story: gross margin reflects pricing and direct costs, the operating line reflects how heavy your overhead is, and the bottom line adds the effects of debt and tax. Lenders and buyers often strip some of those layers back out, which is what measures like EBITDA try to do.
A thin net margin amplifies every shock. At an 8% margin, a 5% rise in costs or a modest revenue dip can erase most of the profit. A fat margin gives you shock absorbers, but it also tends to attract competition: sustained high margins invite new entrants and price pressure, so few businesses keep them without some durable advantage.
The owner-salary distortion
In small business, net margin has an honesty problem: the owner's pay is a choice, and that choice moves the margin. An incorporated owner who pays herself a modest salary and leaves the rest in the corporation shows a fat margin. The same business paying the owner a full market salary shows a thin one. Neither is wrong, but they are not comparable.
This is why comparing your net margin to published industry statistics without adjusting is misleading: you do not know how the owners in the sample paid themselves. Before comparing, restate your numbers with a realistic market salary for the work you actually do. What is left after that is the true profit of the business itself.
Improving the margin: price, mix, costs
Generally speaking, the levers rank in this order. Price is the most powerful: a small increase flows almost entirely to the bottom line if volume holds. Mix is next: selling more of your high-margin products and services, and less of the marginal ones, lifts the average without changing a single price. Costs come last, not because they do not matter, but because most small businesses have already been squeezed there and the remaining savings are hard-won.
The order matters because owners instinctively reach for cost-cutting first. It feels safe, while repricing feels risky. Yet the math usually favours the price and mix levers by a wide margin.
In Canada
For Canadian corporations, the tax line in the waterfall reflects the combined federal and provincial corporate rate, and active small businesses typically pay the lower small business rate on their first tranche of income, so after-tax margins for comparable businesses can differ across provinces and income levels. Sole proprietors have no tax line inside the business at all: their profit is taxed on the personal return, so their "net margin" is really a pre-tax number. Keep that in mind when comparing across business structures.
Worked example
Marc's incorporated plumbing company shows $50,000 of net profit on $400,000 of revenue, a 12.5% net margin. But Marc pays himself only $30,000 a year, well below what he would have to pay a hired manager and lead plumber. Restated with a $90,000 market salary, the company's true profit is closer to a break-even result. The margin was not measuring a great business; it was measuring an underpaid owner. That distinction matters most when Marc goes to sell, because a buyer will do exactly this restatement.
Related terms
Reviewed by Alexandre Bernier, CFP®, CIM®, PFP®·Updated August 2026