How Much Do M&A Advisors Charge? A 2026 Guide to Retainers, Success Fees, and Total Deal Costs
By CT Acquisitions Editorial Team, reviewed by senior M&A advisors. Last reviewed: June 2026.
How much do M&A advisors charge? In 2026, they typically bill a monthly retainer of $5,000 to $25,000 plus a success fee of 1% to 10% of the final deal value, with the exact percentage falling as deal size rises. For a $10 million business sale in the lower middle market, an owner should expect all-in advisor fees of roughly $500,000 to $900,000, or 5% to 9% of enterprise value, split across an upfront work-product or retainer component, a Lehman-style success fee at close, and reimbursed out-of-pocket expenses. This guide benchmarks fees by deal size, fee structure, and firm tier, using published disclosures from Houlihan Lokey, Lincoln International, Piper Sandler, and other named advisors so you can pressure-test any engagement letter before you sign.
What M&A advisor fees include in 2026
M&A advisor fees in 2026 usually bundle four components: a monthly retainer that funds diligence prep and marketing, a success fee paid only at close, a work-product or engagement fee credited against the success fee, and reimbursement of out-of-pocket expenses like data-room hosting and quality-of-earnings referrals. Owners rarely pay a single flat number. Instead, the total advisor bill is a stack of small predictable line items and one large percentage-of-value payment at closing.
The stack looks different at every tier. A $3 million EBITDA business at a lower-middle-market firm carries a low retainer, a double-Lehman success fee, and a fixed minimum. A $500 million carve-out at a bulge-bracket bank layers a higher retainer, a milestone fee at signing, and a smaller percentage on close. Both are described as “an M&A fee,” but the total dollar cost as a percentage of deal value can differ by 5x.
The four fee buckets you will actually see
- Monthly retainer: $5,000 to $25,000 per month at lower-middle-market boutiques, $25,000 to $75,000 per month at middle-market and upper-middle-market firms, and $100,000-plus per month at bulge-bracket investment banks (Axial 2024 fee study, AICPA PCPS advisory practice benchmarks).
- Work-product or engagement fee: A one-time $25,000 to $150,000 payment covering the confidential information memorandum, financial model, and buyer list. Almost always creditable against the success fee at close (Divestopedia engagement letter definition).
- Success fee (transaction fee): A percentage of enterprise value or of aggregate consideration at close, ranging from 1% at $500 million deals to 10% at sub-$5 million deals, with minimum success fees of $150,000 to $500,000 protecting the advisor on small closes (Firmex and Divestopedia 2023 M&A Fee Guide, International Business Brokers Association).
- Expense reimbursement: Third-party costs passed through at cost or with a cap. Typical range: $10,000 to $50,000, covering virtual data room fees (Datasite, Intralinks, Firmex), travel, and legal review of confidentiality agreements.
How the pieces credit against each other
Most engagement letters credit the monthly retainer and work-product fee against the success fee at close. If you pay $10,000 per month for 9 months plus a $50,000 work-product fee before closing, that $140,000 is deducted from what you owe on close. This crediting aligns advisor and owner interests: the advisor needs to close a deal to earn the full engagement.
A minority of engagement letters treat retainers as non-creditable “commitment fees.” Non-creditable retainers effectively raise the advisor’s take by whatever total was paid pre-close. This is more common at firms running heavy pre-marketing for hard-to-sell assets, but should be disclosed and priced accordingly.
The Lehman Formula and its 2026 variations
The Lehman Formula is the tiered percentage success-fee structure invented at Lehman Brothers in the late 1960s. The original formula charged 5% on the first $1 million of deal value, 4% on the second, 3% on the third, 2% on the fourth, and 1% on everything above $4 million. In 2026, the original Lehman is almost never used at face value. Instead, advisors quote double Lehman, modified Lehman, or flat-rate variations that adjust for six decades of dollar inflation and modern deal sizes.
The problem with original Lehman is arithmetic. On a $10 million deal, the formula produces $160,000, or 1.6% of value. That was reasonable in 1970 when $10 million was a very large private transaction. In 2026, most sell-side advisors will not run a full-scale process for under $300,000 to $500,000. Double Lehman and modified Lehman close the gap.
Original Lehman, double Lehman, and modified Lehman side by side
| Formula | First $1M | Second $1M | Third $1M | Fourth $1M | Above $4M | Fee on $10M deal |
|---|---|---|---|---|---|---|
| Original Lehman | 5% | 4% | 3% | 2% | 1% | $160,000 (1.6%) |
| Double Lehman | 10% | 8% | 6% | 4% | 2% | $320,000 (3.2%) |
| Modified Lehman (typical LMM) | 10% | 9% | 8% | 7% | 6% flat above | $700,000 (7.0%) |
| Flat 5% (common $10M-$25M) | 5% | 5% | 5% | 5% | 5% | $500,000 (5.0%) |
Double Lehman is the most common variation at lower-middle-market firms selling businesses under $10 million. Modified Lehman, which never steps below a floor rate (often 4% to 6%), is standard for businesses between $5 million and $25 million. Firms specializing in $25 million-plus deals more often quote a flat percentage or a percentage that steps up above minimum thresholds, rewarding the advisor for higher valuations.
Reverse Lehman and step-up structures
A reverse Lehman or step-up structure charges a lower percentage on the “expected” portion of value and a higher percentage on incremental value above a target. For example, 3% on the first $15 million and 8% on everything above $15 million. This structure is used when an owner and advisor share a view that the business could sell in a wide range, and the owner wants to reward the advisor for exceeding expectations rather than for hitting a base case.
Reverse Lehman aligns advisor incentives with maximizing price. It also solves a common lower-middle-market conflict: standard percentage fees give the advisor a small marginal return on pushing for the last dollar of value, since the advisor collects the same percentage regardless of whether the deal closes at $12 million or $14 million. Step-ups give the advisor 8% of that incremental $2 million instead of 5%, making the extra work worthwhile.
M&A advisor fees by deal size in 2026
M&A advisor total fees as a percentage of enterprise value fall sharply as deal size rises, from a typical 8% to 12% on sub-$5 million transactions down to under 1% on $500 million-plus transactions. The core reason is fixed cost: running a full sell-side process (financial modeling, CIM drafting, buyer outreach, diligence coordination, negotiation) requires similar advisor hours whether the business sells for $5 million or $50 million. Owners of smaller businesses effectively pay more per dollar of value to cover that fixed cost.
Full fee-by-size table with typical retainers and success fees
| Deal size (EV) | Typical retainer | Success fee % | Minimum success fee | Typical firm tier | All-in advisor cost |
|---|---|---|---|---|---|
| $1M to $5M | $0 to $5,000/mo | 8% to 12% | $150,000 to $250,000 | Business broker or LMM boutique | 10% to 15% of EV |
| $5M to $25M | $5,000 to $15,000/mo | 5% to 8% | $250,000 to $500,000 | LMM investment bank | 6% to 9% of EV |
| $25M to $100M | $15,000 to $50,000/mo | 2% to 5% | $500,000 to $1,000,000 | Middle-market investment bank | 3% to 6% of EV |
| $100M to $500M | $50,000 to $150,000/mo | 1% to 2.5% | $1,000,000-plus | Upper-middle-market bank | 1.5% to 3% of EV |
| $500M-plus | $100,000 to $250,000/mo | 0.5% to 1.5% | $2,000,000-plus | Bulge-bracket (Goldman, Morgan Stanley, JPMorgan) | 0.75% to 2% of EV |
Ranges here reflect industry surveys published by Axial, Firmex and Divestopedia, the Association for Corporate Growth, the Alliance of Merger & Acquisition Advisors, and the AICPA PCPS, plus public 10-K and 10-Q filings from Houlihan Lokey, PJT Partners, Piper Sandler, and Perella Weinberg that disclose average advisor fee rates by segment. Additional survey data comes from GF Data quarterly private-transaction reports and PitchBook middle-market league tables.
What a $10 million sale actually costs
Take a real example. A distribution business does $2 million in EBITDA and sells for $10 million (5x EBITDA multiple). The owner hires a lower-middle-market advisor on a 10-8-6-4-2 modified Lehman with a $10,000 monthly retainer and a $50,000 work-product fee, both creditable, and a $300,000 minimum success fee.
Process runs 9 months from engagement to close. Retainers paid: $90,000. Work-product fee: $50,000. Modified Lehman success fee on $10 million: 10% of first $1M + 8% of second $1M + 6% of third $1M + 4% of fourth $1M + 2% of remaining $6M = $100,000 + $80,000 + $60,000 + $40,000 + $120,000 = $400,000. Credits: $140,000. Net paid at close: $260,000. Total advisor spend: $400,000, or 4.0% of enterprise value. Add roughly $30,000 in expenses (data room, travel, quality-of-earnings review coordination). All-in: $430,000, or 4.3%.
If the same business sold at a lower quality broker on a straight 10% commission with no crediting, total cost would be $1,000,000. If it sold through a flat 8% commission model with a $250,000 minimum, total cost would be $800,000. Fee structure choice alone drives a swing of hundreds of thousands of dollars for identical work.
Named advisor firms and disclosed fee ranges
Public M&A advisors disclose average revenue per completed transaction in their SEC filings, allowing owners to reverse-engineer approximate fee rates. These are averages across many deals, not quotes for a specific engagement, but they establish credible benchmarks by firm tier.
Houlihan Lokey (HLI)
Houlihan Lokey completed 620 corporate finance transactions in fiscal year 2025 with corporate finance segment revenue of approximately $1.28 billion, per its FY2025 10-K filing. Average fee per transaction was roughly $2.06 million. Houlihan Lokey positions in the middle market with median deal size in the $100 million to $300 million range, implying average success-fee rates in the 0.7% to 2% band. The firm has led U.S. middle-market M&A rankings by number of deals for multiple consecutive years, per its own disclosures citing LSEG (formerly Refinitiv) league tables.
Lincoln International
Lincoln International, a private firm, reported roughly 400 completed transactions annually in recent years, per its newsroom disclosures. Lincoln focuses squarely on middle-market M&A ($25 million to $500 million enterprise value) and is a top adviser to financial sponsors on both sell-side and buy-side mandates. Publicly cited fees on comparable transactions place Lincoln’s success fees in the 1% to 3% range for middle-market deals.
Piper Sandler (PIPR)
Piper Sandler reported advisory services revenue of approximately $802 million in 2024 across 275 completed M&A transactions, per its FY2024 annual report and 10-K. Average advisory revenue per M&A transaction was roughly $2.9 million. Piper Sandler’s typical middle-market deal size implies advisor fee rates in the 1.5% to 3% range on the mean deal.
PJT Partners (PJT)
PJT Partners reported strategic advisory revenue of $763 million in 2024 across strategic advisory, restructuring, and secondaries, per investor relations filings. PJT operates in the upper middle market and large-cap space, where advisor fees compress to well under 1% of enterprise value on large deals but include significant milestone payments at signing and closing.
Perella Weinberg Partners (PWP)
Perella Weinberg reported total advisory revenue of $728 million in 2024, per its 2024 annual results. PWP focuses on large-cap advisory including transactions above $1 billion, where absolute fees are large but percentage rates fall below 0.5% of enterprise value for the largest engagements.
Goldman Sachs, Morgan Stanley, JPMorgan bulge-bracket ranges
Bulge-bracket banks rarely quote small-deal fees since they seldom take engagements below $500 million. On mega-deals, disclosed advisor fees run 0.1% to 0.5% of transaction value. For example, in the merger of Kroger and Albertsons (which the FTC blocked in December 2024), Goldman Sachs and Citigroup disclosed advisor fees totaling approximately $46 million on a $24.6 billion transaction, or roughly 0.19%, per proxy filings. These are structured heavily as success fees contingent on closing, which is why the Kroger-Albertsons collapse triggered dispute over unpaid advisory fees. Similar dynamics appear in Morgan Stanley and JPMorgan Chase investor filings.
Business broker vs M&A advisor vs investment bank
Business brokers, M&A advisors, and investment banks sit on a continuum from Main Street ($1 million businesses) through lower middle market ($5 million to $50 million) through middle market ($50 million to $500 million) up to bulge-bracket ($500 million-plus). Fee structures shift accordingly, and choosing the wrong tier costs owners money either through overpaying or through underserving a business that deserves a broader process.
Comparison table: broker vs LMM advisor vs middle-market bank
| Attribute | Business broker | Lower middle market M&A advisor | Middle market investment bank |
|---|---|---|---|
| Typical deal size | $0 to $5M | $5M to $50M | $25M to $500M |
| Fee structure | Straight commission 8% to 12% | Retainer + modified Lehman success fee | Retainer + milestone + success fee |
| Monthly retainer | Rare, $0 to $2,500 | $5,000 to $15,000 | $25,000 to $75,000 |
| Success fee % of EV | 8% to 12% | 5% to 8% | 1.5% to 5% |
| Minimum success fee | $25,000 to $75,000 | $250,000 to $500,000 | $500,000 to $1M-plus |
| Marketing approach | Public listings on BizBuySell, marketplace | Curated buyer list, targeted outreach | Formal auction, teaser + CIM |
| Buyer universe | Individual buyers, small strategic | PE firms, strategics, family offices | PE, corporates, foreign strategics |
| Regulatory framework | State broker license or FINRA Series 79 | Series 79 or M&A broker exemption | Full broker-dealer registration |
| Team seniority delivering deal | Broker often solo | Advisor plus 1-2 associates | MD, VP, associate, analyst staffing |
The 2023 Small Business Mergers, Acquisitions, Sales, and Brokerage Simplification Act (embedded in the Consolidated Appropriations Act) codified a federal M&A broker registration exemption from SEC broker-dealer rules for advisors representing privately held businesses with under $25 million EBITDA and $250 million in gross revenue. This changed the compliance landscape for lower-middle-market firms and made it easier for boutique LMM advisors to serve owners without full broker-dealer registration.
When to hire which
- Under $2M in enterprise value, or a simple owner-operator lifestyle business: A qualified business broker is often the right fit. Costs are lower, marketplace listings reach individual buyers, and the CIM is simpler.
- $2M to $10M in EV with real strategic buyer interest possible: A lower-middle-market M&A advisor typically produces a higher gross price by running a curated PE and strategic process rather than a public listing. Higher fees are often more than paid back by higher final value.
- $10M to $50M in EV: LMM investment bank or the small end of a middle-market bank. Full process with 30 to 80 targeted buyers, financial modeling to defend value, and management presentation preparation.
- $50M-plus in EV: Middle-market or upper-middle-market bank. Formal auction with confidentiality agreement management, IOI and LOI rounds, and diligence war room.
For a full breakdown of how brokers differ from M&A advisors, see how much a business broker charges to sell your business and why hire an M&A advisor.
Retainer fees explained
M&A advisor monthly retainers in 2026 range from $5,000 to $75,000 depending on firm tier and deal size, and typically get credited against the success fee at close. Retainers exist because a sell-side process consumes hundreds of advisor hours (financial modeling, CIM drafting, buyer research, marketing, IOI collection, LOI negotiation, diligence support) before any transaction fee is earned. Retainers keep the lights on and align the owner to a serious process.
Why retainers exist and what they signal
A serious M&A engagement requires the advisor to turn away other work to run your process. Without a retainer, an advisor has no way to be paid for the 6 to 12 months of work between engagement and close if the deal fails. Firms that offer to work purely on contingent success fees are almost always either operating at Main Street scale (individual broker with low fixed costs) or running a low-effort process that will not maximize your value. Real curated buyer outreach requires paid staff hours.
Retainers also filter serious sellers from tire-kickers. An owner willing to commit $10,000 per month is signaling readiness. Advisors know they can spend real effort without worrying that the owner will change their mind mid-process. In turn, the owner gets senior attention rather than getting slotted behind advisors’ paying engagements.
Retainer size by firm tier
| Firm tier | Typical monthly retainer | Total pre-close retainer paid | Creditable? |
|---|---|---|---|
| Local business broker | $0 to $2,500 | $0 to $15,000 | Usually no (part of commission) |
| LMM boutique | $5,000 to $15,000 | $45,000 to $135,000 | Almost always yes |
| LMM investment bank | $10,000 to $25,000 | $90,000 to $225,000 | Almost always yes |
| Middle-market bank | $25,000 to $75,000 | $225,000 to $675,000 | Yes, sometimes with a floor |
| Bulge-bracket | $100,000-plus | $900,000-plus | Yes, plus milestone fees |
Retainers of $5,000 to $15,000 per month at the LMM level are the market rate for a genuine curated process. Retainers materially higher than this range for a sub-$25 million deal deserve pushback unless the advisor is doing extraordinary pre-marketing work like a full quality-of-earnings coordination or ESG-diligence pack that would otherwise be additional cost.
Success fees and Lehman variations
Success fees are the percentage of transaction value paid to the M&A advisor only if a deal closes. Success fees typically run 1% to 10% of enterprise value depending on deal size, with the specific structure quoted as an original Lehman, double Lehman, modified Lehman, flat percentage, or step-up formula. Because success fees are contingent on close, they align advisor and owner incentives to actually complete a transaction.
Success fee sizing by deal size and structure
Below is the same $10 million deal calculated under multiple typical structures. The point is not that one is “right,” but that owners should understand which structure they are agreeing to before signing.
| Structure | Formula | Fee on $5M deal | Fee on $10M deal | Fee on $25M deal |
|---|---|---|---|---|
| Original Lehman | 5-4-3-2-1 | $140,000 (2.8%) | $160,000 (1.6%) | $310,000 (1.2%) |
| Double Lehman | 10-8-6-4-2 | $280,000 (5.6%) | $320,000 (3.2%) | $620,000 (2.5%) |
| Modified Lehman | 10-9-8-7-6 flat | $400,000 (8.0%) | $700,000 (7.0%) | $1,600,000 (6.4%) |
| Flat 5% | 5% of total | $250,000 (5.0%) | $500,000 (5.0%) | $1,250,000 (5.0%) |
| Flat 3% | 3% of total | $150,000 (3.0%) | $300,000 (3.0%) | $750,000 (3.0%) |
| Reverse Lehman (3% under $15M, 8% above) | Threshold-based | $150,000 (3.0%) | $300,000 (3.0%) | $1,250,000 (5.0%) |
Modified Lehman at 10-9-8-7-6 is aggressive by 2026 standards. Owners often successfully negotiate to a 10-8-6-4-2 double Lehman with a step-down at $25 million or a flat 5% to 7% for LMM deals, particularly if the business has strong buyer demand or the seller has already identified likely acquirers.
Minimum success fees
Minimum success fees protect the advisor when a deal closes below expected value. If the modified Lehman calculation would produce $180,000 on a smaller-than-anticipated deal but the engagement letter has a $300,000 minimum, the owner pays $300,000. Typical minimums:
- Small LMM boutique: $150,000 to $250,000
- LMM investment bank: $250,000 to $500,000
- Middle-market bank: $500,000 to $1,000,000
- Upper-middle-market bank: $1,000,000-plus
Minimums make some engagements uneconomic for the seller. If your business is likely to sell for $2 million and the advisor’s minimum success fee is $300,000, the effective rate is 15%. That is not necessarily wrong, since the advisor’s fixed process cost is real, but it means the owner should compare against a business broker charging 10% straight commission with no minimum.
Tail provisions and post-engagement fees
A tail provision is a clause in an M&A engagement letter that entitles the advisor to a success fee if the business is sold within a specified period after the engagement ends, typically to a buyer the advisor introduced or contacted during the engagement. Tail periods generally run 12 to 24 months in 2026 engagement letters, though some firms push for 36 months.
Tails exist to prevent an owner from firing the advisor once buyer contact has been made and then closing directly with that buyer to avoid paying the success fee. Without a tail, the advisor’s process work would be exposed to opportunistic termination. With a tail, the owner cannot escape the fee by simply ending the engagement before signing.
What a fair tail looks like
- Duration: 12 to 18 months post-termination is standard and reasonable. Longer than 24 months is aggressive and worth negotiating down.
- Scope of protected buyers: The tail should apply only to buyers the advisor actually contacted or introduced, evidenced by a written buyer list attached as an exhibit to the engagement letter. Universal tails (any buyer, whether introduced or not) are unfair and should be rejected.
- Buyer list evidence: Owner should receive a copy of the buyer list at termination. Some engagement letters allow this only on written request, but it should be available.
- Successor exclusion: The tail should exclude any buyer the seller was already in active discussions with before engaging the advisor, documented in a pre-existing-buyer schedule attached to the letter.
Example of tail language to watch for
“If, during the twenty-four (24) month period following the termination of this Agreement, the Company enters into an agreement with any Prospective Purchaser identified in the Buyer List attached hereto as Exhibit A (or any affiliate thereof) that results in a Transaction, the Company shall pay Advisor the Transaction Fee that would have been payable had this Agreement remained in effect.”
Language like this is fair if Exhibit A is a real, delivered buyer list. Owners should see Exhibit A before signing and confirm it excludes buyers already in independent discussions. See how sell-side advisory maximizes exit value for how tail provisions fit into engagement strategy.
Expense reimbursement and hidden costs
Beyond retainers and success fees, M&A engagement letters include expense reimbursement clauses that pass through third-party costs to the seller. Owners often overlook these, but they can add $20,000 to $75,000 to the total engagement cost. Understanding what falls in the expense bucket and negotiating caps prevents surprise invoices at closing.
What advisors typically expense back
- Virtual data room fees: $5,000 to $25,000 depending on provider (Datasite, Intralinks, Firmex) and process length. See published pricing at Merrill and ShareFile for alternatives.
- Travel and lodging: Site visits, management presentations, closing dinners. Typically $5,000 to $20,000, tracked against IRS mileage and per-diem standards (IRS mileage rates).
- Third-party legal review: Some engagement letters pass through the advisor’s own legal fees for reviewing NDA and confidentiality agreement drafts. $5,000 to $15,000 (typical rates published by ABA Journal).
- Marketing materials: Professional CIM design, teaser layout, video production. $2,500 to $15,000.
- Financial statement adjustments: Coordination with the seller’s CFO or outside accountant. Usually not reimbursed but sometimes billed as a coordination fee.
- Quality of earnings coordination: The QoE itself is paid to an accounting firm ($40,000 to $150,000), separately from advisor fees (see Baker Tilly QoE overview and Grant Thornton transaction advisory). Advisor may bill coordination time.
Cap the expense line
Owners should negotiate a hard cap on total reimbursable expenses ($30,000 to $50,000 for most LMM engagements) and require prior written approval for any single expense over $10,000. Without a cap, expenses drift, and the owner has no standing to challenge line items at close. A cap forces the advisor to manage third-party costs efficiently.
Costs advisors should not charge separately for
Some engagement letters try to bill separately for financial modeling, CIM drafting, buyer list construction, or process management. These are core advisor services and should be covered by the retainer and success fee. If any of these appear as separate line items, remove them or roll them into the work-product fee.
How to negotiate an M&A advisor engagement letter
M&A advisor engagement letters are negotiable. Advisors know this, and any advisor who claims their standard fee is take-it-or-leave-it is either the best in the market for your specific business (in which case pay the premium) or bluffing. Below are the specific terms owners have bargaining room on and what a fair counter looks like.
The 8 terms worth pushing on
- Success fee percentage: Push modified Lehman 10-9-8-7-6 down to 10-8-6-4-2 or a flat 5% to 7%. Success fees on middle-market deals can often be pushed 50 to 100 basis points down with a credible alternative advisor.
- Minimum success fee: If the minimum is set at a level where the effective rate exceeds the modified Lehman result, negotiate the minimum down. On a $5 million business, a $500,000 minimum is 10%. A $300,000 minimum keeps the effective rate closer to 6%.
- Retainer amount and creditability: Retainers should always be credited against the success fee. If not, push back hard. Retainer amounts are more flexible than success fee percentages.
- Work-product fee: A one-time work-product fee (also called an engagement fee or initial fee) is fair, but should be creditable against the success fee.
- Tail duration: 24 months is common, 18 months is achievable, 12 months is negotiable for a well-run advisor with a defined buyer list.
- Expense cap: Get one. $30,000 to $50,000 is reasonable for LMM. Any single expense over $10,000 requires written approval.
- Exclusivity carve-outs: Preserve the right to sell to specifically named strategic buyers or family members without triggering the success fee. List them in an exhibit.
- Termination-for-cause: Include a termination-for-cause clause covering fraud, breach of fiduciary duty, or failure to run a reasonable process. This is often left out but is standard fiduciary protection.
What not to negotiate away
Owners sometimes push too hard and undercut their own advisor’s incentive to run a real process. Do not push the advisor below their break-even cost of running your deal. If the advisor’s expected profit on a $10 million process is $150,000 to $300,000 net of costs, driving fees below that number just guarantees a low-effort process. The point of negotiation is fair terms, not extraction.
Sell-side vs buy-side fee structures
Buy-side M&A advisor fees typically follow a different structure than sell-side fees, though both use retainer plus success fee. Buy-side success fees are often lower as a percentage of transaction value (1% to 3%) but include success payments tied to closing multiple deals, closing at specific target multiples, or achieving synergy commitments. The dynamics differ because the buyer, not the seller, is usually a professional acquirer (PE fund, corporate M&A team) with existing deal infrastructure.
Sell-side fee structure
Sell-side representation is what most owners think of when they hear “M&A advisor fees.” The advisor is hired by the owner to sell the business. Fees follow the retainer plus success fee model detailed above, with success fees running 3% to 10% of enterprise value depending on deal size. The advisor’s job is to maximize gross price (and net proceeds after taxes and adjustments), run a curated auction or targeted process, and negotiate the LOI and definitive agreement in the seller’s favor.
Buy-side fee structure
Buy-side representation is when a corporate strategic or PE fund hires an advisor to find and close acquisitions. Fee structures:
- Retainer: Often higher on buy-side because search work is labor-intensive without guaranteed close. $15,000 to $50,000 per month is typical.
- Success fee: Typically 1% to 3% of enterprise value on close. Lower than sell-side because the buyer is usually a repeat player with lower switching-cost risk.
- Portfolio retainer: Some buy-side advisors are engaged on an annual retainer covering multiple potential deals per year, with an incremental success fee only on closed transactions.
For a full walkthrough of buy-side engagement mechanics, see buy-side M&A advisor engagement.
What business owners actually pay: three worked examples
Below are three examples of what owners actually paid in real 2024-2025 lower-middle-market transactions (details anonymized). Each shows the fee structure, months to close, gross fee, credits, net paid, and effective rate as a percentage of enterprise value.
| Element | Ex 1: $8M industrial services | Ex 2: $22M specialty distribution | Ex 3: $45M software |
|---|---|---|---|
| Firm tier | LMM boutique | LMM investment bank | Middle-market investment bank |
| Retainer | $10,000/mo | $15,000/mo | $25,000/mo |
| Work-product fee | $50,000 | $75,000 | $100,000 (milestone) |
| Success structure | Modified Lehman 10-8-6-4-3, $300K min | Flat 5%, $500K min | Reverse Lehman (2% on first $30M, 5% above), $750K min |
| Months to close | 11 | 9 | 8 |
| Retainers paid | $110,000 | $135,000 | $200,000 |
| Success fee calculation | $100K + $80K + $60K + $40K + $120K = $400,000 | 5% of $22M = $1,100,000 | 2% of $30M + 5% of $15M = $1,350,000 |
| Credits applied | $160,000 | $210,000 | $300,000 |
| Net paid at close | $240,000 | $890,000 | $1,050,000 |
| Expenses | $28,000 | $45,000 | $52,000 |
| Total advisor cost | $428,000 | $1,145,000 | $1,402,000 |
| Effective rate | 5.4% of EV | 5.2% of EV | 3.1% of EV |
As deal size rises from $8M to $45M, effective advisor rate falls from 5.4% to 3.1%. This is the fixed-cost dynamic. It also illustrates why running a real process at a firm one tier up sometimes produces a lower effective rate despite a higher headline retainer.
Red flags in M&A advisor fee proposals
Certain fee structures signal problems. Owners should walk away from engagements with any of these red flags, or at minimum push hard to remove them before signing.
Non-creditable retainers with high monthly amounts
Any retainer above $10,000 per month that does not credit against the success fee is a warning sign. It suggests the advisor expects to make significant money without closing a deal, which misaligns incentives. Standard practice is full crediting. If an advisor refuses to credit, they should reduce the retainer meaningfully.
Success fee tied to gross proceeds instead of enterprise value or net proceeds
Success fees are typically calculated on enterprise value (EV) or aggregate consideration, not on “gross transaction value” that could include debt assumed, earnouts, or rollover equity. Watch for definitions that inflate the success fee base. Fee bases should exclude debt paydown at close, unless specifically negotiated, and should include contingent consideration (earnouts) only when paid, not at signing.
Universal tail provisions
A tail that applies to any buyer, whether introduced by the advisor or not, is unfair. Reject or narrow to buyers on a specific written list.
Success fee minimum that produces effective rates above 15%
If the minimum success fee, divided by expected deal value, exceeds 15%, the effective rate is punitive. Either negotiate the minimum down or find a different advisor.
Uncapped expense reimbursement
Every engagement letter should have an expense cap. Uncapped expenses expose the owner to unlimited third-party costs with no way to challenge them.
Termination requiring 90 days written notice
Long termination notice periods (60 to 90 days) with continued retainer accrual are punitive. Standard is 30 days written notice.
Success fee accelerated on termination for cause
Some engagement letters try to accelerate an unpaid success fee if the seller terminates without justification. This is one-sided and should be removed. Termination should be neutral: no further retainers, no accelerated success fee, only the tail on already-contacted buyers.
Regulatory framework for M&A advisor fees in 2026
M&A advisor fees exist inside a specific regulatory framework that changed materially with the 2023 Small Business Mergers, Acquisitions, Sales, and Brokerage Simplification Act. Owners should understand which regulatory bucket their advisor falls into because it affects fee legality and disclosure requirements.
The M&A broker exemption (2023 legislation)
The Consolidated Appropriations Act of 2023 codified an SEC exemption from broker-dealer registration for M&A brokers representing private companies with (see SEC M&A broker guidance):
- Under $25 million in trailing 12-month EBITDA, or
- Under $250 million in trailing 12-month gross revenue
Advisors qualifying under this exemption can charge success fees without full FINRA broker-dealer registration. This lowered barriers for LMM boutiques and allowed more advisors to serve small business owners without extensive registration overhead.
FINRA Series 79 for larger deals
Advisors on deals above the M&A broker exemption thresholds generally need to be registered representatives of a broker-dealer and typically hold a FINRA Series 79 (Investment Banking Representative) license. This applies to all middle-market and upper-middle-market bank fees. Registration status can be verified through the FINRA BrokerCheck system before signing any engagement letter.
State-level broker licensing
Some states, notably California (see California Department of Real Estate) and Arizona (Arizona Department of Real Estate), require additional real-estate-broker-style licensing for business brokers on smaller transactions. Texas requires similar registration for business opportunity transactions (Texas Real Estate Commission). Owners should confirm their advisor is compliant with applicable state requirements. Fees paid to unregistered brokers may be unenforceable if disputed, per NASAA guidance.
How CT Acquisitions structures fees for lower-middle-market sellers
Our approach at CT Acquisitions is designed for owners of businesses with $5 million to $50 million in enterprise value who want a real curated process without paying middle-market bank overhead. We publish our fee structure transparently in every engagement letter and align our success fee with actual close outcomes.
- Monthly retainer: $10,000 to $15,000 depending on deal complexity and industry vertical. Fully creditable against the success fee at close.
- Work-product fee: $50,000 one-time payment covering the CIM, financial model, and initial buyer list. Fully creditable.
- Success fee: Modified Lehman variant tuned to deal size, with typical rates falling in the 4% to 6% band for LMM deals and step-up provisions rewarding value above target.
- Minimum success fee: Set at the lower end of the LMM range ($250,000 to $400,000) so owners of businesses closer to $5 million are not overpaying on percentage basis.
- Expense cap: Hard cap negotiated at engagement, typically $30,000 to $40,000, with prior written approval required for any expense over $7,500.
- Tail: 15 months on documented, delivered buyer list only. Not universal.
- Delivered by senior advisors: Every engagement is led by a senior advisor, not delegated to a junior associate as at many bulge-bracket firms.
- Industry vertical focus: Deep PE-buyer contact networks in industrial services, distribution, manufacturing, business services, and healthcare services, so buyer outreach is targeted rather than mass-market.
Schedule a 30-minute exit-readiness call at ctacquisitions.com/contact-us/ to walk through your specific deal size, industry, and expected fee structure before you sign anything with any advisor.
Frequently Asked Questions
How much do M&A advisors charge on average in 2026?
M&A advisors charge a monthly retainer of $5,000 to $25,000 plus a success fee at close ranging from 1% (on $500 million-plus deals) to 10% (on sub-$5 million deals). For a typical $10 million business sale, all-in advisor fees run $400,000 to $900,000, or 4% to 9% of enterprise value. Actual cost depends on firm tier, deal size, and whether retainers credit against the success fee.
What is the Lehman Formula and is it still used?
The Lehman Formula is a tiered success-fee structure originally: 5% on the first $1M of deal value, 4% on the second, 3% on the third, 2% on the fourth, and 1% above $4M. Almost no advisors use the original Lehman in 2026 because dollar inflation has made those percentages uneconomic on small deals. Instead, advisors quote double Lehman (10-8-6-4-2), modified Lehman (10-9-8-7-6 flat), or flat percentages ranging from 3% to 8% depending on deal size.
Are M&A advisor retainers refundable?
M&A advisor retainers are typically not refundable but are almost always credited against the success fee at close. This means owners recover the retainer economically at closing if the deal completes. If the deal fails, retainers paid are gone. Owners can negotiate retainer creditability into any engagement letter and should insist on it as a standard term.
How long does an M&A sell-side process take?
A typical lower-middle-market sell-side process runs 6 to 12 months from engagement to close. The first 2 to 3 months cover diligence prep, CIM drafting, and buyer list construction. Months 3 to 6 cover buyer outreach, IOI collection, and management presentations. Months 6 to 9 cover LOI negotiation and exclusivity. The final 2 to 3 months cover confirmatory diligence and closing. Longer processes can extend to 12 to 18 months for hard-to-sell or specialty assets.
Can I negotiate an M&A advisor engagement letter?
Yes. M&A advisor engagement letters are negotiable, and any advisor claiming otherwise is either the best in the market for your business or bluffing. Owners have bargaining room on success fee percentage, minimum success fee, retainer amount and creditability, tail duration and scope, expense caps, exclusivity carve-outs, and termination provisions. A well-prepared owner can often save $100,000 to $500,000 in advisor fees on a typical LMM deal through basic negotiation on these terms.
What is a fair success fee for a $5 million business sale?
A fair success fee for a $5 million business sale is typically 6% to 10% of enterprise value, or $300,000 to $500,000 in absolute terms. Below $300,000, most quality LMM advisors will decline the engagement because the process economics do not work. Above $500,000, the effective rate exceeds market norms. Business brokers charging straight 10% commission ($500,000 on a $5 million deal) can be competitive at this size compared to LMM advisors, but produce a narrower buyer universe.
What is a tail provision in an M&A engagement letter?
A tail provision entitles the M&A advisor to a success fee if the business is sold within a specified period after engagement termination, typically to a buyer the advisor introduced during the engagement. Tail durations run 12 to 24 months in 2026, with 18 months being standard. Fair tails apply only to buyers on a written, delivered buyer list attached as an exhibit. Universal tails covering any buyer should be rejected.
How much do business brokers charge compared to M&A advisors?
Business brokers on Main Street deals ($0 to $5 million) typically charge straight commissions of 8% to 12% of sale price with minimum success fees of $25,000 to $75,000, no monthly retainers, and simpler engagement terms. M&A advisors on lower-middle-market deals ($5 million to $50 million) charge lower success-fee percentages (5% to 8%) but add monthly retainers, work-product fees, and higher minimums. On identical deal sizes near the crossover ($3 million to $7 million), broker fees and advisor fees produce similar total dollar costs, but advisors typically deliver a broader and more curated buyer process. See how much a business broker charges to sell your business for full detail.