Net Profit Margin
Net income divided by revenue. The bottom-line profitability ratio, after every operating, financing, and tax effect.
When to use: The most-cited profitability number, but also the most distorted — interest expense, one-time charges, tax credits, and accounting policies all affect it. Pair with operating margin for a cleaner read on core profitability.
Formula
Variables
| Symbol | Name | Description | Unit |
|---|---|---|---|
| NetMargin | Net Profit Margin | Net income divided by revenue | % |
| NetIncome | Net Income | Bottom-line profit after all expenses, interest, and taxes | $ |
| Sales | Annual Sales | Annual revenue (net sales) | $ |
Real-Life Examples
Example 1: Levered Industrial
Net income $250M, revenue $2,000M.
Given
Step-by-Step
12.5% net margin. Combined with the 20% operating margin example above, the gap (7.5pp) reflects interest expense plus taxes. A capital-light, debt-free version of the same business would show a net margin much closer to operating margin.
Frequently Asked Questions
Interest expense and taxes. Heavily levered firms often show net margins meaningfully below operating margins. The gap quantifies the "drag" of capital-structure and tax decisions.
Often. Restructuring charges, asset impairments, gain/loss on sale, tax-rate changes — all hit net income but not operating income. Adjusted (or "core") net margin filters these out for a cleaner trend.