What Is Operating Income?
Operating income measures how much profit a company generates from running its actual business, before the effects of financing decisions and taxes. The formula is Operating Income = Gross Profit - Operating Expenses, where operating expenses include selling, general and administrative costs (SG&A), research and development, and depreciation.
By stopping short of interest expense and taxes, operating income isolates the performance of the business itself from how it is funded. Two identical businesses with different debt loads will report the same operating income but different net income.
Operating Income vs. EBIT and EBITDA
In most cases operating income and EBIT (earnings before interest and taxes) are the same number, though EBIT can differ when a company has non-operating income such as gains on investments. EBITDA goes one step further by adding back depreciation and amortization, the major non-cash expenses.
Operating margin, calculated as Operating Income / Revenue, shows how much of each sales dollar survives all operating costs. It is a standard benchmark for comparing operational efficiency across companies.
Example
A retailer earns $20 million of revenue with $12 million of COGS, giving $8 million of gross profit. After $5 million of operating expenses covering store staff, rent, corporate overhead, and depreciation, operating income is $3 million and operating margin is 15%. Interest and taxes are then deducted below this line to reach net income.
Why It Matters
Operating income is the cleanest income statement measure of whether management is running the business well, since it strips out capital structure and tax effects that can obscure comparisons. Lenders also use it in coverage ratios to test whether operations can support the company's debt.
In valuation work, operating profit is the launching point for NOPAT and unlevered free cash flow, making it a number you will touch constantly as a banking or private equity analyst.
