Synergies
Cost savings or revenue gains expected from combining two companies in an M&A deal — cost synergies (eliminating duplicate functions) are typically more reliably modelled than revenue synergies.
Why Synergies matters in interviews
Synergies are the justification for most of the premium paid in M&A, and interviewers ask about them to see whether you are credulous. The useful candidate is the one who can say which synergies are real and which are the ones that never materialise.
How it works in practice
Cost synergies come from eliminating duplicated functions — overlapping head office, consolidated procurement, shared systems, closed sites. They are quantifiable, controllable and generally realised.
Revenue synergies come from cross-selling, expanded distribution or pricing power. They are far less reliable, arrive later, and are heavily discounted by the market when announced.
Both must be tax-affected before flowing into an accretion/dilution analysis, and set against the one-off cost to achieve them — restructuring charges, severance, system integration — which typically runs at one to two times the annual run-rate synergy.
What candidates get wrong
- Forgetting the cost to achieve. Announced synergies are gross of the spend required to unlock them.
- Treating revenue synergies as equivalent to cost synergies in a model. Practitioners haircut them heavily or exclude them entirely.
- Missing dis-synergies — customer attrition, staff departures, management distraction — which are real and rarely modelled.
Synergies: frequently asked questions
What is the difference between cost and revenue synergies?
Cost synergies remove duplicated expense — overlapping corporate functions, procurement scale, consolidated facilities — and are relatively reliable because they are within management's control. Revenue synergies depend on customers behaving as predicted after the deal, arrive more slowly, and are realised far less often, so acquirers and analysts discount them heavily.
Why do most acquisitions fail to deliver announced synergies?
Because revenue synergies assume customer and market behaviour that integration disruption often undermines, because the cost to achieve is underestimated, and because dis-synergies — attrition of key staff and customers, management distraction — are rarely modelled at all. Cost synergies are delivered far more reliably than revenue ones.
Go deeper
This term comes up constantly in investment banking interviews and on the desk.
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