Earnings before interest, taxes, depreciation, and amortization, adjusted for non-recurring, non-operating, and owner-related items. The number buyers multiply.
In a sale
Adjusted EBITDA is the figure a buyer multiplies, so every dollar in it counts twice: once in the earnings and again in the price. It is built step by step from the financial statements, and the buyer's accountants will rebuild it in diligence. The number that holds up is the one with documentation behind each adjustment, including the adjustments that lower it.
Where it comes up
The Go-To-Market Analysis (GTMA) builds the file a buyer would build on your business, before a buyer does.