What buy-side M&A advisors charge in 2026

Fee conversations on the buy side are shorter than on the sell side and worse informed. A seller talks to four bankers and reads four proposals. A buyer engages a search firm once, negotiates against nothing, and finds out afterwards what the market rate was.

The underlying grammar is stable and reasonably well documented. What follows is what the survey data says, why buy-side pricing sits where it does, and the three clauses that matter more than the headline percentage.

Effective rates fall as deals get larger

The single most reliable fact about advisory fees is that they are regressive: the effective percentage falls as transaction value rises. This is not a volume discount. It reflects the work, which does not scale with price. Building and working a target universe for a $10M acquisition consumes broadly the same senior hours as one for a $40M acquisition.

The Firmex/Axial survey of 189 US middle-market advisors puts effective sell-side fees at approximately:

• 6.3% at $5 million
• 3.9% at $20 million
• 2.0% at $100 million

Axial’s 2026 sample of 331 advisors lands in the same place: roughly 3.4% at $20 million, compressing to about 2.0% by $100 million.

Buy-side rates sit below these. DealRoom’s 2026 summary gives 2–3% for transactions of $10–50 million, 1.5–2.5% for $50–250 million, and 1–2% above that. As a rule of thumb, a buy-side fee runs at roughly three quarters to four fifths of the sell-side equivalent at the same size.

Why buy-side is cheaper, and why that is correct

The discount is not a comment on difficulty. It is a comment on scope. A sell-side mandate carries work that simply does not exist on the buy side:

• normalising EBITDA and preparing for a quality-of-earnings review;
• writing a confidential information memorandum;
• assembling and running a competitive process against a buyer list;
• managing a data room and a Q&A log across multiple bidders;
• defending the number through to signing.

A buy-side mandate replaces all of that with origination, outreach, qualification and negotiation support. It is a different job, and it is priced as one. An advisor charging sell-side rates for buy-side scope should be asked which of the above they are doing.

The Lehman scale and its descendants

Just over half the advisors in the Firmex sample — 51% — use a declining scale, the descendant of the Lehman Formula. The classic version charges 5% on the first million of consideration, 4% on the second, and so on down to 1% above five million. “Double Lehman” doubles the entry rates, starting at 10% and settling at 2%. In practice almost nobody uses either unmodified.

About a third of advisors use a flat percentage regardless of size. It has one real advantage — a client can compute it — and one real defect: at the top of a range it is expensive, and at the bottom it is uneconomic for the advisor, which is why flat scales almost always come attached to a minimum.

A declining marginal scale is the better instrument, provided it is genuinely marginal. Ask explicitly whether each rate applies to the whole transaction value or only to the portion inside its tier. A “banded” scale where 2.5% applies below $25 million and 2.0% above it produces the absurdity that a $25.1 million deal costs less in fees than a $24.9 million one. Marginal scales have no such cliff.

Retainers, and what “credited” means

Three quarters of US middle-market advisors charge some form of engagement fee. The structure has shifted: monthly retainers now dominate, where one-off upfront retainers used to. Two thirds of advisors charging monthly are in the $5,000–$10,000 band; buy-side search programmes at the larger firms run considerably higher, commonly $5,000–$15,000 per month on a six to twelve month commitment.

The word to interrogate is credited. A retainer credited in full against the success fee is a cash-flow instrument: it funds the work before there is a fee, and it disappears from the economics when a deal closes. A retainer that is not credited is simply an additional fee. Both are legitimate; they are not the same thing, and the engagement letter will say which without drawing attention to it.

Minimums

Minimum success fees are standard in the middle market and exist for an unglamorous reason: below a certain transaction value, the fee does not cover the work, and an advisor without a minimum will quietly deprioritise the small mandate rather than lose money on it. A published minimum is a commitment device.

Documented examples from 2025–26 engagement letters cluster at $100,000 and $150,000. Below roughly $100,000 you are generally looking at business-broker territory and transactions under $2 million. Above $150,000, a buyer working in the lower middle market should ask what is being priced.

The minimum only bites at the bottom of a scale. On a 4%-entry buy-side ladder, a $150,000 minimum is exceeded by any transaction above about $3.75 million — so for a mandate with a $5 million floor it functions as a floor, not as a charge.

The three clauses that matter more than the rate

The fee base. The percentage is meaningless until “transaction value” is defined. Assumed debt, rollover equity, escrow, seller notes and earn-outs can move the base by thirty per cent or more. Earn-outs deserve particular attention: a fee payable on the maximum earn-out at closing charges you for money you may never pay. The correct treatment is that contingent consideration is fee-bearing only if, as and when it is actually paid.

The tail. If the engagement ends, for how long afterwards is a fee still owed on a company the advisor introduced? Eighteen to twenty-four months is standard and reasonable. What matters is that the tail attaches to a written, dated register of named companies that you have seen, not to a vague category of “opportunities identified”. Without that register the clause is unbounded.

Non-circumvention. The fee should be due whether the transaction is completed by you, an affiliate, a portfolio company, a co-investor or a special purpose vehicle. Buyers occasionally read this as a trap. It is the opposite: it is the clause that makes a success-fee model possible at all, and its absence tells you the advisor expects to be paid another way.

What to ask before signing

1. Is the scale marginal or banded, and can you show me the effective rate at three deal sizes?
2. Is the retainer credited in full, in part, or not at all?
3. What exactly is included in transaction value, and how are earn-outs treated?
4. What is the tail, and where is the register of introduced companies?
5. Are you paid by anyone else in this transaction — the target, the seller, a lender, anyone?

The fifth question is the one that changes the answer to all the others.

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Figures cited are market benchmarks from the sources listed above, not a quotation. Our own scale is published in full on the fees page.