Margins

A margin, or profit margin, is a measure of profit expressed as a percentage of sales. Each margin takes one subtotal of the income statement, such as gross profit, operating profit or net profit, and divides it by revenue, so that together they are part of a common-size income statement: every line stated as a share of sales[1Source 1Thomas R. Robinson, Elaine Henry, Wendy L. Pirie and Michael A. Broihahn, International Financial Statement Analysis (Wiley, 2020), §4.5.1, “Calculation of Profitability Ratios”, p. 251.].

Gross margin

Gross margin is the percentage of sales left after subtracting the cost of goods sold. It is driven by a company’s direct cost per unit, such as materials, manufacturing and direct labor, costs that largely vary with volume, and a company raises it through better sourcing, pricing power and more efficient production[2Source 2Joshua Rosenbaum and Joshua Pearl, Investment Banking: Valuation, LBOs, M&A, and IPOs, 3rd ed. (Wiley, 2020), ch. 1, “Profitability”, pp. 37–38.]. A corporate finance text puts the same point in one line: gross margin reflects a firm’s ability to sell a product for more than the cost of producing it[3Source 3Jonathan Berk and Peter DeMarzo, Corporate Finance (Pearson, 2019), §2.6, “Profitability Ratios”, pp. 71–72.].

Operating, EBIT and EBITDA margin

A business has expenses beyond the direct cost of what it sells, so the next margin is the operating margin, operating income over sales: how much the company earns before interest and taxes from each dollar of sales[3Source 3Jonathan Berk and Peter DeMarzo, Corporate Finance (Pearson, 2019), §2.6, “Profitability Ratios”, pp. 71–72.]. An accounting text describes it as profitability from the operations of the core business, leaving out the effects of investments, financing and the tax position[4Source 4Gerald I. White, Ashwinpaul C. Sondhi and Dov Fried, The Analysis and Use of Financial Statements (Wiley, 2002), “Return on Sales”, pp. 133–134.].

Analysts often use EBIT in place of operating income. The two can differ, because EBIT strictly includes non-operating items such as dividends received and gains and losses on investment securities; what matters most is to compute the ratio the same way for every company and every year being compared[1Source 1Thomas R. Robinson, Elaine Henry, Wendy L. Pirie and Michael A. Broihahn, International Financial Statement Analysis (Wiley, 2020), §4.5.1, “Calculation of Profitability Ratios”, p. 251.]. Adding depreciation and amortization back gives EBITDAEBITDAEBITDA is earnings before interest, taxes, depreciation and amortization: how it is calculated, why bankers compare firms with it, and why it is not cash flow.Terms and methods · revised 28 September 2026 · 1,060 words · 4 sources · 5 min and the EBITDA margin. One banking text calls the EBITDA and EBIT margins accepted standards for measuring operating profitability, used to frame relative performance among peer companies and across sectors[2Source 2Joshua Rosenbaum and Joshua Pearl, Investment Banking: Valuation, LBOs, M&A, and IPOs, 3rd ed. (Wiley, 2020), ch. 1, “Profitability”, pp. 37–38.].

Pretax and net margin

Below operating profit come the costs of financing and tax. The pretax margin is earnings before tax over sales, after interest; the profit margin, or net margin, is net income over sales, net of all expenses[4Source 4Gerald I. White, Ashwinpaul C. Sondhi and Dov Fried, The Analysis and Use of Financial Statements (Wiley, 2002), “Return on Sales”, pp. 133–134.].

	Earlier year	Later year
Sales	176.1	186.7
Gross profit		33.3
Gross margin (33.3 ÷ 186.7)		17.8%
Operating income	7.1	10.4
Operating margin (7.1 ÷ 176.1; 10.4 ÷ 186.7)	4.03%	5.57%

Source: The worked example in the corporate finance text cited below, restated; amounts as the text gives them, margins as it computes them.

In the example, of each dollar of sales about 18 cents is left after the direct cost of the goods, and under 6 cents after the other costs of operating the business[3Source 3Jonathan Berk and Peter DeMarzo, Corporate Finance (Pearson, 2019), §2.6, “Profitability Ratios”, pp. 71–72.].

What margins are used for

Margins put companies of different sizes on one scale. Comparing operating or EBIT margins across firms within an industry is a way to assess the relative efficiency of their operations[3Source 3Jonathan Berk and Peter DeMarzo, Corporate Finance (Pearson, 2019), §2.6, “Profitability Ratios”, pp. 71–72.], which is why they sit beside the multiples in comparable companies analysisComparable companies analysisComparable companies analysis values a business from the multiples similar public companies trade at: choosing peers, spreading the numbers, picking a range.Terms and methods · revised 28 September 2026 · 1,109 words · 3 sources · 5 min. They are read from the income statement, the first of the three financial statementsThe three financial statementsThe income statement, the balance sheet and the cash flow statement: what each one shows, what period it covers, and the two links that tie them into one model.Terms and methods · revised 28 September 2026 · 1,071 words · 4 sources · 5 min, and none of them says anything of the cash tied up in working capital or spent on equipment.

One margin cannot be read from the statements at all. The contribution margin, sales less variable costs over sales, needs the split between fixed and variable costs, which companies rarely provide[4Source 4Gerald I. White, Ashwinpaul C. Sondhi and Dov Fried, The Analysis and Use of Financial Statements (Wiley, 2002), “Return on Sales”, pp. 133–134.].

@misc{xlsxdev-2026-margins,
  author       = {{xlsx.dev}},
  title        = {{Margins}},
  howpublished = {xlsx.dev Wiki},
  year         = {2026},
  month        = oct,
  url          = {https://xlsx.dev/wiki/margins}
}