Synergies: the number that justifies the premium
By SuperdayReps · Wharton MBA · ex-Greenhill · investment banking interview coaching
6 min read · updated July 2, 2026
Here's the question that hangs over every acquisition: why is the buyer paying more than the target is worth on its own?
The answer is almost always synergies, the extra value the combined company can create that neither side could alone. A buyer pays a control premium (typically 20% to 40% above the unaffected share price) and then has to earn that premium back. Synergies are how. If the buyer can't point to real synergies, it's just overpaying with a story attached.
The premium is the price. The synergies are the justification. A deal only makes sense if the present value of synergies is worth more than the premium you paid. Miss that and you've transferred wealth from your shareholders to theirs.
The two flavors, and why one is trusted more
There are two kinds of synergies, and interviewers care a lot that you know the difference in credibility.
Cost synergies are the savings from cutting duplicate stuff. Two head offices become one. Two finance teams, one. Overlapping factories, distribution centers, back-office systems, board seats: you don't need two of each. These are inside the buyer's control. You can put a name and a dollar figure on each cut before you sign. That's why they're credible and why they show up fast, usually within the first year or two.
Revenue synergies are the extra sales the combined company hopes to generate. Cross-sell the acquirer's product to the target's customers. Bundle. Enter a new region using the other side's sales force. The logic sounds great in a pitch. The problem is that revenue synergies depend on customers behaving the way you predict, and customers don't take orders from a deal model. They churn. They renegotiate. Sales cycles run long.
Trusting revenue synergies as much as cost synergies. They are not the same animal. Cost cuts are things you do to yourself; revenue synergies are things you hope other people (customers) do for you. Seasoned buyers and their boards heavily haircut revenue synergies, often to zero for deal-justification purposes, and treat them as upside rather than the reason to do the deal. If a banker leans on revenue synergies to make the math work, that's a red flag, not a green light.
Keep reading
The rest of this lesson is free with an account
There's about 3 more minutes of Synergies: the number that justifies the premium below this, plus every other lesson in M&A. Free account, no card.
Any partner school .edu
Frequently asked
- What are synergies in M&A?
- Synergies are the extra value a combined company creates that neither side could alone, and they are what justify the control premium a buyer pays. There are two kinds: cost synergies from cutting duplicate overhead, which are credible and near-term, and revenue synergies from new sales, which are softer and get heavily discounted.
- Why are cost synergies trusted more than revenue synergies?
- Cost synergies are things you do to yourself: cut duplicate head offices, finance teams, and factories. You can name each cut and a dollar figure before signing, so they show up fast. Revenue synergies depend on customers behaving the way your model predicts, and customers churn and renegotiate, so seasoned buyers haircut them hard.
- How do synergies justify the premium a buyer pays?
- A deal only makes sense if the present value of synergies is worth more than the premium you paid. Pay a 300 premium and capture 400 of synergy value, and you keep the 100 difference. Pay the whole synergy value away in the price and you took all the risk and captured nothing.
LearnAI