Good point Ewan. However,In accounting and finance, earnings before interest and taxes (EBIT) or operating income is a measure of a firm's profitability that excludes interest and income tax expenses.[1]
EBIT = Operating Revenue – Operating Expenses (OPEX) + Non-operating Income
Operating Income = Operating Revenue – Operating Expenses[1]
Operating income is the difference between operating revenues and operating expenses, but it is also sometimes used as a synonym for EBIT and operating profit.[2] This is true if the firm has no non-operating income.
A professional investor contemplating a change to the capital structure of a firm (e.g., through a leveraged buyout) first evaluates a firm's fundamental earnings potential (reflected by Earnings Before Interest, Taxes, Depreciation and Amortization EBITDA and EBIT), and then determines the optimal use of debt vs. equity.
To calculate EBIT, expenses (e.g., the cost of goods sold, selling and administrative expenses) are subtracted from revenues.[3] Profit is later obtained by subtracting interest and taxes from the result.
or, you could just clean enough windows to have some money left at the end of the month. :