Most M&A advisors charge a success fee, a percentage of the final sale price paid only when your deal closes, and many also charge a monthly or upfront retainer. The percentage varies with deal size, and the structure matters more than the headline number, because the structure determines whether your advisor is paid to close your deal or just to shop it.
Here is how the pieces work.
Success fees
The success fee is the core of almost every sell-side engagement. It is a percentage of the total transaction value, paid at closing out of proceeds. Smaller deals carry higher percentages and larger deals carry lower ones, because the work of selling a $15 million company is not much less than the work of selling a $150 million company, while the fee base is ten times smaller.
Many firms use a scaled structure. The oldest version is the Lehman formula, which steps the percentage down as deal value steps up. Some advisors invert this with a reverse scale that pays a higher percentage on value above an agreed threshold. That inverted structure is worth paying attention to as a seller, because it rewards the advisor most for the dollars that matter most to you: the ones above your expectations.
Retainers
Retainers are smaller fixed payments, monthly or upfront, usually credited against the success fee at closing. Sellers sometimes bristle at them. In my experience the retainer serves a purpose on both sides. It confirms the seller is serious, which matters when an advisor is deciding where to spend the next six months, and it filters out advisors who make their living collecting retainers on deals they never intend to close. Ask whether the retainer is credited against the success fee. If it is, incentives stay pointed at the closing table.
What alignment actually looks like
A fee agreement is an incentive document. Read it that way. An advisor whose economics come overwhelmingly from the success fee wins when you win. An advisor collecting heavy fixed fees regardless of outcome has already been paid before a single buyer signs anything.
The other alignment signal is selectivity. A firm that takes every engagement is running a volume business. A firm that turns down deals it cannot sell is protecting its closing rate. We say no to mandates we do not believe in, because taking every engagement is how firms end up shopping deals instead of closing them. Ask any advisor you interview what their closing rate is. Then ask how they calculate it.
Questions to ask before you sign
Ask who does the work, whether the retainer credits against the success fee, and how the percentage scales with deal size. Ask what the tail period is (the window after the engagement ends during which the advisor is still owed a fee if you sell to a buyer they introduced) and whether the fee applies to earnouts and seller notes or only to cash at close. Ask what happens if you decide not to sell. None of these are gotcha questions. A good advisor has crisp answers to all of them.
Fees are the wrong thing to optimize
One point from 25 years of doing this: the difference between advisors is rarely the fee percentage. It is the outcome. A specialist who knows every serious buyer in your sector, runs a competitive process, and defends your number through diligence will routinely produce a price difference that dwarfs any spread in fees. We have facilitated over $10 billion across 209+ deals, and I have never seen a seller regret paying a full fee on a great outcome. I have seen plenty regret hiring the cheapest banker in the room.
If you are weighing a sale and want to ground the conversation in numbers, start with our free valuation calculator at 733park.com/tools/portfolio-valuation, or contact us for a confidential discussion of your situation at 733park.com/contact.
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