Operating Income
Operating income is the profit a company generates from its core business operations after deducting both cost of goods sold and all operating expenses — including selling, general and administrative costs, research and development, and depreciation and amortization — but before subtracting interest expense and income taxes.
Operating income, also called earnings before interest and taxes (EBIT), occupies the middle section of the income statement and serves as the primary measure of a company's operational profitability independent of its capital structure and tax jurisdiction. Because it excludes interest expense, operating income allows investors to compare the core profitability of businesses with different debt loads — a heavily leveraged company and a debt-free competitor will show the same operating income if their operational performance is identical, even though their net incomes will differ significantly.
The path from gross profit to operating income involves subtracting operating expenses. The primary categories are: selling expenses (sales force compensation, marketing, advertising, and distribution costs), general and administrative expenses (corporate overhead, executive salaries, legal, accounting, and occupancy costs), research and development expense, and depreciation of property, plant, and equipment plus amortization of intangible assets. Together with COGS, these constitute a company's total operating cost structure.
Operating margin — operating income divided by revenue — measures how efficiently a company converts each revenue dollar into operating profit. High operating margins indicate that either gross margins are strong or that the company achieves significant operating leverage: fixed costs spread over a growing revenue base produce disproportionately growing profits. Software and pharmaceutical companies with high gross margins and scalable cost structures can achieve operating margins of 30 to 40 percent at scale. Capital-intensive businesses with high fixed depreciation charges and narrow gross margins may operate at margins of 5 to 10 percent.
Operating leverage is the key dynamic linking revenue growth to operating income growth. A company with 70 percent of its cost base fixed (facilities, headcount, technology infrastructure) and 30 percent variable will see operating income grow much faster than revenue when volumes expand, because incremental revenue primarily flows through to operating profit. The same leverage works in reverse during downturns, amplifying operating income declines relative to revenue declines.
Adjusted EBIT or adjusted operating income strips out non-cash items (stock compensation, amortization of acquired intangibles) and non-recurring charges to show the underlying operating profitability. This adjusted figure is the basis for enterprise value-to-EBIT valuation multiples used in comparable company analysis.