Operating Income
Revenue minus the costs of running the core business (cost of sales + SG&A) — profit that shows the strength of the main business before interest, taxes, and one-off items.
Operating income = Revenue − Cost of revenue − Selling, general & administrative expenses
Steadily rising operating income is a sign that the core business is getting stronger.
In plain terms
Operating income is revenue with only the "costs of running the core business" taken out. On top of the cost of making the product, it also subtracts selling and administrative costs like advertising, employee salaries, and rent. Interest, taxes, and one-time gains or losses have not been subtracted yet.
So operating income shows best "how well this company earns from its main business." It sets aside things outside the core business — such as how much debt it carries (interest) or taxes — and looks purely at how the business itself performs.
What it tells you
Operating income reflects the strength of a company's core business. By excluding items like interest and taxes that differ by company and by country, it allows a fairer comparison of core operations.
Dividing operating income by revenue gives the operating margin, and adding depreciation back gives EBITDA. Many key metrics branch out from operating income.
Formula
Operating income = Revenue − Cost of revenue − Selling, general & administrative expenses (= Gross profit − SG&A)
What high or low means
Steadily rising operating income is a sign that the core business is getting stronger. If operating income grows faster than revenue, the company may be in a phase where efficiency improves with scale (operating leverage at work).
If operating income is positive but net income is negative, it can be read as a sign of heavy interest costs or large losses outside the core business.
Which costs count as "operating" and how far they are included differ somewhat by company. In particular, when a company excludes some costs and separately reports "adjusted operating income," the figure can look better than the actual one, so accounting-standard numbers and adjusted numbers are different values.
Operating income includes non-cash costs such as depreciation. So even when operating income looks good, actual cash flow can differ; the cash-based answer is in operating cash flow and FCF.
One-off costs (restructuring, litigation) can weigh on a particular quarter's operating income and cause the margin to drop sharply. Looking at the trend over several quarters rather than a single quarter shows the real flow.
Metrics to read alongside
See it in real stocks
Search US stocks on Stocklore to see SEC-filing-based financial metrics alongside the sector benchmark.
This explanation is for information and reference only and is not a recommendation to buy or sell any security. Investment decisions and their consequences are your own.