Synergy

What it means

In M&A, synergies are the benefits expected from combining two businesses: cost synergies from removing duplicated functions, consolidating sites and renegotiating supplier terms, and revenue synergies from cross-selling, pricing power or market access. The synergy estimate is what allows an acquirer to pay more than the target is worth on a standalone basis and still call the deal value-creating.

How an early estimate becomes the deal

The synergy number is typically produced before diligence begins, because it is needed to justify the offer. From that moment it anchors everything: the premium, the board approval, the announcement to investors. Diligence then reports to a number the deal already depends on, and every downward revision threatens the transaction itself, so revisions meet resistance that has nothing to do with evidence. Cost synergies at least have line items behind them. Revenue synergies rest on customers behaving as the model hopes, and customers were not consulted.

Where the number breaks

• Costs of capturing synergies, integration teams, retention packages, systems consolidation, understated or excluded entirely.
• The same saving counted in two workstreams and discovered only when integration budgets collide.
• Dis-synergies ignored: customers who leave, key people who exit, the year of internal focus competitors enjoy.
• No named owner for delivery after close, at which point the estimate becomes nobody's problem.