M&A Advisor Fees and Engagement Terms: How to Choose and Pay an Advisor

Hiring an M&A advisor is usually the first significant decision in a sale, and one of the few made before you know what your company will fetch. The engagement letter you sign in month one governs how a fee in the high six or seven figures is calculated in month nine, what you owe if the deal collapses, and whether you can walk away if the relationship is not working. Owners often spend weeks debating valuation and an afternoon on the engagement letter. The proportions should be closer.

This guide explains who the different types of sell-side intermediaries are, how they are paid, how the common fee formulas work in dollars, which engagement terms are standard and which deserve negotiation, and how to evaluate the people pitching for your mandate. The figures are indicative ranges drawn from typical practice in the US lower middle market; your own quotes will vary with deal size, sector, complexity and market conditions.

Business brokers, M&A advisors and investment banks

The labels overlap and nobody polices them, but in practice three broad types of intermediary represent sellers of private companies. They differ mainly in the size of company they serve, the kind of buyer they reach and the depth of the process they run.

• Business brokers typically handle main-street and small businesses, often under $5M in revenue and under $1M in earnings. They tend to market listings to individual buyers through online marketplaces, run several engagements at once and work on a success fee with little or no retainer.
• M&A advisors, sometimes called boutique investment banks, typically serve the lower middle market: companies with roughly $5M–$150M in revenue and $1M–$25M in EBITDA. They run a structured, confidential process aimed at strategic acquirers, private equity firms, family offices and independent sponsors.
• Middle-market investment banks typically take on larger companies, often above $25M in EBITDA, with bigger teams, broader capital-markets capabilities and higher minimum fees. Some also provide financing, fairness opinions and public-market services.

The right choice depends less on the label than on fit. A $3M-revenue local services company will rarely attract a middle-market bank and may not need one. A $60M-revenue manufacturer with a credible private equity audience will usually leave value on the table with a listing-style process. The middle is where judgment matters most: ask each candidate how many recent engagements resembled yours in size and sector.

Licensing and the securities question

In the US, the sale of a company can be a securities transaction, most clearly when the buyer acquires stock or membership interests rather than assets. As a general rule, a person who receives transaction-based compensation for effecting securities transactions must be registered with the SEC as a broker-dealer and be a member of FINRA, or fit within an exemption. This is why many M&A advisory firms either are registered broker-dealers, conduct securities activities through an affiliated or unaffiliated registered broker-dealer, or structure their work to rely on an exemption.

Federal law now contains an M&A broker exemption, added to the Securities Exchange Act in 2023, which covers certain intermediaries facilitating the transfer of ownership of an eligible privately held company to a buyer that will control and actively operate it. Eligibility turns on size thresholds measured in the year before engagement (EBITDA or gross revenue limits that are periodically adjusted for inflation) and a list of conditions, including restrictions on handling funds or securities, on shell companies and on public offerings, and disclosure and consent requirements if the intermediary represents both sides. Before the statute, the SEC staff had addressed similar activity through a 2014 no-action letter.

States regulate broker-dealers separately. A number of states, California among them, have adopted their own M&A broker exemptions or similar provisions, and their conditions do not always match the federal one. Some states, again including California, have also historically treated brokering the sale of a business opportunity as an activity that can require a real estate license, which is why many main-street business brokers hold one.

How advisors are paid: the building blocks

Almost every sell-side engagement letter combines some of the same five components. Understanding each one separately makes it easier to compare proposals that look very different on the surface.

Retainers

A retainer is a fixed payment made regardless of outcome, either upfront, monthly, or tied to milestones such as completion of the confidential information memorandum. In the lower middle market it is commonly a few thousand to the low tens of thousands of dollars per month, or a one-time amount in the tens of thousands. A retainer signals commitment from both sides and covers part of the advisor’s preparation work if the owner decides not to proceed. The key question is whether retainer payments are credited against the success fee; in most competitive proposals they are, fully or in part.

Success fees

The success fee is the bulk of the advisor’s compensation and is paid at closing, usually out of the sale proceeds through the funds flow. It can be a flat percentage of transaction value, a declining percentage schedule such as the Lehman formula, a fixed dollar amount, or a structure with accelerators above a target price. Its size depends heavily on how “transaction value” is defined, which is covered below.

Minimum fees

A minimum fee guarantees the advisor a floor if the deal closes at a lower price than expected. It is entirely standard; a sell-side process takes roughly the same work at $8M as at $15M. The figure deserves attention because, at smaller transaction values, the minimum rather than the percentage often determines what you pay. If a proposal quotes 3% with a $500K minimum, the effective rate on a $10M deal is 5%.

Expense reimbursement

Advisors commonly bill out-of-pocket expenses such as travel, data room fees, database subscriptions specific to the engagement and outside counsel for the advisor. Reasonable practice is a cap, often in the low tens of thousands of dollars, with pre-approval required above it. Watch for open-ended expense clauses and for marked-up internal charges billed as expenses.

Other fees

Some letters add fees for raising debt or equity financing, for fairness opinions, for minority or partial transactions, or a share of any break-up fee the seller receives if a buyer walks away. None of these is unusual on its own, but each should be explicit, priced and tied to work the advisor actually performs.

Lehman, double Lehman and modified Lehman

The Lehman formula is named after Lehman Brothers, which is commonly credited with popularizing it decades ago. It applies a declining percentage to successive slices of transaction value: 5% of the first $1M, 4% of the second, 3% of the third, 2% of the fourth and 1% of everything above $4M. On any deal larger than $4M, the first four tranches always produce $140K, and the rest is 1% of the excess.

Because those percentages were set when a million dollars bought much more, the original Lehman schedule is rarely used unmodified for lower middle market sell-side work. The double Lehman simply doubles each rate: 10%, 8%, 6%, 4%, then 2% above $4M, so the first $4M produces $280K and every dollar above it 2%. Modified Lehman is a catch-all for any custom schedule: tranches of $5M or $10M instead of $1M, different rates, or a Lehman schedule combined with a minimum fee.

Two things stand out. First, the effective rate falls as the deal grows, which is the point of a declining schedule. Second, the minimum fee dominates at the low end: in the modified example, the percentage schedule alone would produce $300K on a $10M deal, but the $400K floor applies. When comparing proposals, always compute the dollar fee at three prices: your realistic low case, your expected case and your stretch case.

Indicative success-fee ranges by deal size

Effective success-fee rates decline as transaction value rises, because the work involved does not scale linearly with price. The ranges below are typical of what owners see in practice, expressed as an all-in effective rate on transaction value including the effect of minimum fees. They are wide on purpose: complexity, sector, the number of likely buyers and whether the owner already has an interested party all move the number.

Always translate a fee formula into dollars at your low, expected and stretch prices before comparing proposals.

Accelerators: paying for price, not just for closing

A flat or declining fee rewards the advisor for closing, and only weakly for closing at a better price. On a 2% fee, an extra $3M of enterprise value is worth $60K to the advisor and $3M less fees, taxes and costs to you. An advisor working several mandates may rationally prefer a quick close to another round of negotiation. An accelerator, sometimes called a ratchet or incentive fee, narrows that gap by applying a higher rate to value above a target.

Accelerators work best when the threshold is anchored to the advisor’s stated valuation view at the start of the engagement. An advisor confident in a high range should be comfortable with a threshold near it. One who resists any threshold close to the number they pitched has told you something useful about that number.

What counts as transaction value

The percentage is only half the formula; the other half is the base it applies to. Most engagement letters define transaction value broadly as the total consideration paid or payable to the company or its owners, including debt assumed or repaid. Each component below can move the fee materially and is worth reading line by line.

• Cash at closing and debt assumed or repaid by the buyer are almost always included.
• Escrows and holdbacks are usually included at closing; ask whether the fee on an escrow amount is refunded if the escrow is later released to the buyer.
• Earnouts and contingent payments are the most negotiated item. Seller-friendly language pays the advisor its percentage only when and if earnout payments are received; advisor-friendly language pays on an estimated value at closing.
• Seller notes are often treated like earnouts, with the fee paid as principal is collected.
• Rolled equity in a private equity deal is commonly included at its deal value, because the advisor negotiated that value; a lower rate on rollover is a reasonable ask.
• Employment, consulting and non-compete payments to owners can be included if they are disguised purchase price; market-rate compensation for real future work usually should not be.
• Real estate sold or leased separately to the buyer should be addressed explicitly; owners often exclude it or agree a lower rate.
• Working capital adjustments and cash left in or swept out of the business can change the base by a meaningful amount; agree which figure the fee is computed on.

Engagement letter terms: what is market and what to negotiate

Beyond fees, a handful of provisions decide how much flexibility you keep. Most of them protect the advisor against a real risk, so the goal is not to strike them but to size them sensibly.

Exclusivity

Nearly every sell-side letter gives the advisor exclusive rights to represent the company in a sale for a defined term, commonly six to twelve months, often continuing month to month afterward until either side terminates. Exclusivity is reasonable; the advisor cannot run a confidential process if another intermediary is calling the same buyers. What matters is the scope: a sale of the company is fair, but exclusivity over every financing, joint venture or minority investment for the term is broader than a sell-side mandate needs.

Tail provisions

A tail entitles the advisor to its success fee if a transaction closes within a period after termination, commonly twelve to eighteen months and occasionally twenty-four. The protection is legitimate: without it, a seller could terminate the advisor after a buyer is found and close directly. The negotiation is about who the tail covers. Seller-friendly drafting limits it to parties the advisor contacted or introduced during the engagement, listed by name at termination. Advisor-friendly drafting covers any transaction with anyone. The first is fair; the second can mean paying a full fee on a deal the advisor never touched.

Termination

Look for the right to terminate on short written notice, commonly thirty days, after an initial period. Retainers paid are usually non-refundable, and the tail survives termination. Pay attention to any clause that converts termination into a fee obligation, and to whether termination for cause, such as a material breach, shortens or eliminates the tail.

Indemnification, liability and the rest

Advisors routinely ask the company to indemnify them against third-party claims arising from the engagement, except where caused by their own gross negligence or willful misconduct. This is market and rarely movable, but it should be mutual where possible and should not extend to claims brought by the company itself. Also look for a right of first refusal on future transactions, which you can usually strike, and for confidentiality, conflicts and governing-law clauses that your counsel will review.

What “results-based” really means

Many firms describe their fees as results-based, success-based or contingent. The phrase generally means the large majority of compensation is paid only if a transaction closes, so the advisor carries most of the risk of a failed process. It does not necessarily mean there is no retainer, no minimum fee or no expense reimbursement, and it does not by itself guarantee aligned incentives.

A useful test is to ask two questions. First, what will you pay in total if no deal closes? That number, combining retainers and expenses, shows how much risk the advisor really carries. Second, how does the advisor’s fee change if the price rises by 10%? If the answer is “by a small fraction,” the structure rewards closing more than price, and an accelerator may be worth discussing. Results-based compensation aligns advisor and owner on getting a deal done; aligning them on price, terms and certainty takes deliberate drafting.

How to evaluate an advisor

Fees are the easiest part of a proposal to compare and rarely the most important. A 0.5% difference in fee on a $25M deal is $125K; a weak process can cost multiples of that in price, terms or certainty of closing. Four things deserve most of your diligence.

1. The team that will actually work the deal. Ask who will draft the materials, call buyers, run management meetings and negotiate the letter of intent, and how many active engagements each of them carries. The senior banker who pitches should be visibly present through closing.
2. Buyer reach. Ask how the buyer list will be built, how many parties are likely to be contacted, how strategic and financial buyers will be balanced, and how the advisor finds acquirers beyond the usual private equity databases.
3. The valuation view. Ask for a range and the reasoning behind it, including comparable transactions and the adjustments to EBITDA a buyer is likely to accept. An advisor who simply agrees with your number is not doing the work.
4. References. Speak with at least two former clients, ideally including one whose deal did not close or closed below expectations, and ask what the advisor did when the process hit trouble.

Red flags when choosing an advisor

• A valuation well above the others with no supporting analysis. Sometimes called buying the mandate, it wins the engagement and is walked back once buyers respond.
• Large upfront fees that are not credited against the success fee, or a retainer structure that pays the advisor well whether or not a deal closes.
• Claims of buyers “ready to write a check” before the advisor has seen your financials.
• A senior pitch team that disappears after signing, replaced by junior staff you never met.
• An open-ended tail covering any transaction with any party, or exclusivity that reaches every future financing.
• Pressure to sign quickly, or reluctance to let your counsel review the engagement letter.
• No clear answer on licensing or on how the firm complies with securities rules.
• Representing both buyer and seller in the same transaction without full written disclosure and consent.
• Unwillingness to put the expected fee in dollars at your realistic price range.

Putting it together

Run a short, disciplined selection: meet three advisors whose recent work resembles your company in size and sector, ask each for a written proposal and a valuation view, compute every fee in dollars at three prices, and have M&A counsel mark up the preferred engagement letter before you sign. Focus negotiation on the definition of transaction value, the minimum fee, the scope of the tail and exclusivity, and an accelerator tied to a price that would genuinely please you. Then judge the people as carefully as the terms, because they will represent your company to every buyer who sees it.

Laurent Capital’s fees are results-based, so our compensation is tied to the outcome we are hired to deliver. Our sourcing platform, LC Scout, LC Enrich and LC Outreach, refreshes our coverage of strategic and financial buyers daily, which lets owners see the breadth of the likely audience before committing. If you are evaluating advisors for a sale, recapitalization or buyout, we are glad to walk through our terms alongside the others you are considering.