Operating Income: Before Interest and Tax
Operating income is what remains after cost of goods sold and operating expenses are subtracted from revenue, before interest and tax. Removing financing and tax makes it a better comparison between two companies than net income, because those depend on decisions unrelated to the business itself.
How it works
Revenue, minus cost of goods sold, minus operating expenses. What is left is what the business earned from operating.
Interest and tax come out below it to give net income, which is the number quoted in headlines and the one that mixes three separate stories together.
Why the comparison works
Two companies with identical operations can report very different net income. One borrowed heavily and pays interest; the other did not. One is in a high-tax jurisdiction; the other is not. Neither difference says anything about how well the business runs.
Operating income removes both, which is exactly what you want when the question is “which of these businesses is better at what it does” rather than “which produced more profit for shareholders last year.”
As a percentage of revenue it is the operating margin, which is the comparable form and the one worth tracking across years.
With one caveat that applies to every line on the statement: what counts as operating is partly a classification decision, disclosed in the accounting policies and occasionally changed.
The relatives it is confused with
EBIT — earnings before interest and tax — is usually the same figure and not always. Operating income excludes non-operating items by definition; EBIT is arrived at from the bottom by adding interest and tax back, so it includes anything non-operating that sat above the interest line. On most companies the difference is small; on a company with meaningful investment income or asset sales it is not.
Excluding a one-off asset sale is the feature, not an omission. Selling a building is not the business operating; including it would make a good year look like a good business.
And it is not cash. Depreciation is subtracted before you reach it, and depreciation is an accounting allocation rather than a payment. Adding it back gets you toward EBITDA, which is a different measure with its own problems.
In practice
It amplifies revenue changes in both directions, because the operating expenses beneath it are mostly fixed. A 10% revenue move can be a 30% operating income move, and the same arithmetic runs against you in a weak year.
If the point of reading this is to trade the shares, the cost of acting is separate and fixed: 2% of a median bar’s range per round trip on this site’s shared price history.
A number makes the comparison argument concrete. Two companies each earn 150 at the operating line on revenue of 1,000 — identical 15% operating margins. Company A has no debt and pays tax at 21%: net income is about 119. Company B borrowed to buy its assets, pays 70 of interest and the same rate on what is left: net income is about 63.
Reported profit differs by nearly a factor of two and the operations are identical. Anyone comparing those two on net income concludes one is a far better business; anyone comparing on operating income concludes they are the same business with different balance sheets, which is what is actually true. The financing difference is real and it belongs in a separate question — how much interest cover each has, and what happens to each in a year when operating income falls by a third.
What operating income is not
It is not net income. Interest and tax are still to come.
It is not cash flow. Depreciation is subtracted and working capital movements are not in it at all.
It is not free of judgement. What counts as operating is a classification.
And it is not EBITDA. That adds depreciation and amortisation back and is not a defined accounting measure at all.
When it fails
Operating income can rise while cash falls. Revenue recognised but not collected, inventory built and not sold, capital spending outrunning depreciation — all of it is invisible here and visible on the cash flow statement. Reading one statement alone is the most common and most expensive mistake in company analysis.
The second failure is ignoring the financing that was excluded. A company with the same operating income as a competitor and far more debt is a different investment, and this line deliberately does not show that.
A third is comparing margins across industries. Operating margin describes a business model as much as gross margin does.
A fourth is missing reclassification. A cost moved between operating and non-operating changes this figure without changing the company.
And a fifth is treating one year as the level. Operating leverage means the figure swings, and a single strong year in a cyclical business is not a new baseline.
The original data
Of the 31,760 trading and investing videos in this site’s corpus, 0 have “operating income” in the
title, 0 have “revenue”, and 0 have “gross profit”. “Cash flow” returns 17 videos at a median of 67,134
views; the relative strength index (“RSI”) returns 844 at a median of 3,907. The counts are in research/corpus-coverage.json,
produced by site/measure_corpus.py.
Seventeen videos against 844, with the seventeen earning seventeen times the median views, is worth sitting with. It says the shortage of material about how companies earn money is a supply problem rather than a demand one. For anyone reading a set of accounts, the practical consequence is that the operating line — the one that isolates the business from its financing — is barely discussed in the material a search will surface, and it is the line that answers the question most people think they are asking when they look at profit.
Related
EBIT is the nearly identical measure and where the two differ. Operating expenses is the subtraction immediately above it. And income statement is the full sequence it sits inside.
Operating income is the line I compare across companies, because interest expense tells me about a financing decision and tax tells me about a jurisdiction, and neither says anything about whether the business is any good. Net income mixes all three and is quoted everywhere.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.