What Sellers Pay Their M&A Advisor, and Why Buyers Should Read the Fee Guide

A buyer looking at a marketed lower-middle-market business is looking at a company whose owner has already made an expensive decision. Understanding what that decision cost, and what it was meant to buy, explains more about the process you are about to enter than anything in the confidential information memorandum.

Axial's 2026 M&A Fee Guide is the most current public benchmark for those costs. It reports responses from 331 North American M&A advisors, investment bankers, and business brokers surveyed in the second quarter of 2026. Two things have to be said before any number from it appears:

Every fee in the guide is charged by an advisor to their own client. Because 91% of respondents work primarily on the sell side, these are effectively fees paid by the business owner. There is not a single buy-side fee figure anywhere in the report.

And every fee level is an average. The guide's methodology says so explicitly — success fee benchmarks are reported as averages across all respondents. It publishes no medians, no percentiles, and no dispersion. Anyone citing a "median advisor fee" from this report is citing something that does not exist in it.

With that established, the numbers are genuinely useful.

The fee curve, from $5 million up

Axial's average effective success fee, by transaction size, paid by the seller:

• $5 million transaction: 5.7%
• $10 million: 4.9%
• $20 million: 4.1%
• $50 million: 3.2%
• $100 million: 2.6%
• $150 million: 2.2%

Each of those is up modestly on the prior year's edition — 5.5%, 4.6%, 3.8%, 3.1%, 2.2% and 2.0% respectively. The chart prints no base for any individual point, so the report gives no way to tell how many respondents stand behind the $150 million average versus the $5 million one.

The curve compresses, as fee curves do. What it means in dollars is less intuitive: on a $5 million transaction the average success fee is around $285,000, and on a $20 million transaction around $820,000. For an owner whose entire liquidity event is the $5 million, the first number is a substantial share of the difference between a comfortable retirement and a very comfortable one.

Retainers are common, and mostly credited back

Roughly seven in ten advisory firms charge something before closing. Axial's breakdown, reported as a share of all firms surveyed: 31% charge a one-time fixed retainer, 29% charge monthly, 29% charge no engagement fee at all, 7% bill on milestones, and 2% hourly.

Among the 96 firms charging monthly, the modal band is $5,000 to $10,000 per month, reported by 55% of them. Among the 102 charging a one-time fixed fee, the most common band is $5,000 to $10,000 (26%), with a second cluster at $16,000 to $25,000 (22%) — a band that jumped from 9% a year earlier.

Most of this is credited back. 55% of firms deduct engagement fees fully from the success fee at closing and another 22% deduct them partially, leaving 23% who do not. So the retainer is, for three-quarters of the market, a commitment device rather than incremental compensation: it makes the owner demonstrate seriousness and keeps the advisor's early work funded, then disappears into the closing statement.

One structural detail matters to a buyer. Half of respondents say the success fee is paid in full at closing, 33% describe some combination depending on the deal, and 17% are paid as the seller receives the purchase price — meaning on earnouts and seller notes as they are collected. That last group is small. For most sellers, an earnout-heavy structure means paying the full advisory fee at closing on consideration they may never receive.

Lehman variants, flat percentages, and floors

Axial's respondents describe four dominant structures. Lehman variants — the standard formula, the double, and modified versions, all of which apply a decreasing percentage as price rises — account for 43%. Flat percentage fees account for 36%, up sharply from 26% the prior year. Accelerators, where the percentage increases above a threshold price, have fallen to 13% from 22%. Hybrids account for 8%, and 1% report no success fee at all.

The move from accelerators toward flat percentages is the interesting shift. An accelerator ties the advisor's incentive directly to price above a target. A flat percentage ties it to closing. In a year where advisors describe deals as harder to complete, the drift toward certainty is not surprising.

Then there is the floor. 79% of firms charge a minimum success fee — described in Axial's own chart as "a floor in the engagement agreement that triggers regardless of deal size." The guide publishes no dollar amount for that floor, so the size of it is unknown from this data. Its existence is not: for the great majority of advisory engagements, the percentage curve above is the fee only when the transaction is large enough for the percentage to exceed the floor.

That is worth holding onto, because it is the quiet reason small companies struggle to get represented at all.

What the fee is supposed to buy

Axial's foreword makes the case for the price, and it makes it in the firm's own voice rather than from survey data:

We know that top M&A advisors can drive a 10 - 40% higher valuation, better close rates, and a higher likelihood of finding the right buyer - one that aligns with the owner's culture and values throughout their partnership and long after owners depart.

That claim appears on a page containing no survey results, carries no footnote or citation, and is not supported by any chart in the report — the guide contains no valuation data of any kind. It should be read as Axial's estimate of what good advice is worth, not as a finding about the market.

The same foreword makes a more surprising admission a few sentences later:

But the difficult reality about M&A advisory engagement letter fees is that they aren't always correlated to advisor quality. Unlike the highest quality lawyers or surgeons, where quality is almost perfectly correlated with price, higher quality advisors can often charge similar to lower quality ones.

An owner choosing an advisor, in other words, cannot read quality off the price. That is Axial's own framing of the market its Advisor Finder service exists to address, and it is more candid than most industry publications manage.

Why this matters on the other side of the table

Three reasons, none of them about the money.

A represented seller has already committed. An owner who has signed an engagement letter, is paying a monthly work fee, and has agreed to a floor that triggers regardless of price has done several of the things Stanford's A Primer on Search Funds lists as indications of genuine seller intent — including "spending their own money on lawyers or other service providers in anticipation of a sale" (p. 33). Representation is expensive and therefore informative. Whatever else is uncertain about a marketed deal, the owner's intention to transact usually is not.

The advisor is paid to run a process against you. This is not adversarial framing; it is the job description. The advisor's compensation is a percentage of price, their client is the seller, and Axial's foreword states plainly what the firm believes good advisors deliver. A buyer entering a represented process should expect a competitive dynamic, a timetable set by someone else, and a valuation supported by prepared materials.

The floor explains where representation stops. With 79% of firms charging a minimum success fee, and with 76% of surveyed firms employing ten people or fewer, advisory capacity concentrates where the percentage clears the floor. One respondent, quoted in Axial's "In Their Own Words" section, put it directly: "We have a record pipeline of new clients. We typically don't negotiate our fees much, but we are increasing the minimum deal size that we'll take on."

Companies below that threshold do not stop existing. They stop being represented — which means they are not marketed, not listed, and reachable only by a buyer who goes to find them.

What advisors say their own hardest problem is

The most useful chart in the guide for a buyer is not about fees at all. Axial asked respondents to name, in free text, the single biggest challenge facing their firm. Of the 237 valid responses:

• 32% named sell-side deal flow and quality
• 18% named deal sourcing and marketing
• 12% named buyer or capital constraints
• 11% named macro and political uncertainty
• 11% named talent and capacity
• 8% named the valuation gap
• 5% named competition and new entrants
• 3% named closing and deal momentum

Half of the professional sell-side market names origination as its hardest problem. Axial's own summary: "advisors cited a wide range of challenges, but finding quality sell-side opportunities stood out as the most common theme. Many respondents pointed to a shortage of prepared business owners coming to market."

A buyer waiting for represented deal flow is waiting on a channel whose participants say its scarcest input is the thing you are waiting for.

Reading the guide without overreaching

A few limits worth respecting if you cite this report:

The methodology states 331 responses, but only three charts in the report print a base of their own: the monthly-retainer levels (96 firms), the fixed-retainer levels (102 firms), and the biggest-challenge question (237 valid responses of 242 received). The success-fee charts print no base at all, so no fee percentage in the guide can be tied to a stated number of respondents.

The guide contains no data on process type. It does not distinguish broad auctions from limited processes from negotiated one-off sales, and the word "auction" does not appear in it. It contains no buyer-outreach counts, no close rates, no time-to-close figures, and no valuation multiples.

It publishes no cross-tabs. Fees are not broken out by advisor type, firm size, or deal volume, so the report cannot support a claim that brokers charge differently from bankers.

And every figure is a pooled average of a sell-side-dominated respondent pool. That is a real benchmark, and it is not the same thing as what any individual owner pays.

The takeaway for someone buying a company

The fee guide describes a well-functioning market for a service that a specific slice of companies can afford. Above a few million dollars of transaction value, a business owner can hire a professional to prepare the company, assemble buyers, and run a process — and the average cost of that, at $5 million, is 5.7% of the price they achieve.

Below that slice, and among owners who have simply not decided yet, the same market provides nothing. Those companies are simply unrepresented, and the only way to reach them is to do the origination work that half of Axial's respondents say is the hardest part of their own job.

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