A Quality of Earnings (QoE) is a focused diligence study, usually performed by an accounting firm, that tests whether reported earnings are real, sustainable, and correctly stated. It normalizes EBITDA, scrutinizes the add-backs, and probes revenue recognition, customer concentration, and margin trends. It is not an audit; it is a buyer's deep read of whether the earnings will actually repeat under new ownership.
Why it matters
The QoE is where the number the whole deal is priced on gets validated or cut. Because price is a multiple of Adjusted EBITDA, a QoE that trims EBITDA can move the purchase price by a multiple of the adjustment. It is also where a buyer surfaces the quieter risks, a single customer carrying the margin, revenue pulled forward, or a "one-time" cost that turns out to recur every year.
When the QoE trims EBITDA
Management presents $25M of Adjusted EBITDA. The QoE disallows $2M of aggressive add-backs, leaving $23M. At 6.0x, that finding is worth $12M off the price: the difference between a $150M deal and a $138M deal, identified before signing rather than discovered after.
The common mistake
Relying on management's adjusted figures without independent QoE work, and underwriting a price to add-backs that diligence will not support. The QoE also reaches into the balance sheet, informing the working capital peg and the net working capital assumptions, so a thin QoE leaves risk in both the price and the close-date true-up.