Business Broker & M&A Advisor Fee Calculator: What Owners Pay in 2026
Den Unglin12 min read
Business broker and M&A advisor fees are the most misunderstood cost in any business transaction. Sellers routinely overestimate them on small deals and underestimate them on large ones. Buyers assume they pay nothing — and are occasionally surprised to find they are paying indirectly, or directly if they have engaged a buy-side advisor.
This guide covers every fee structure currently used in US business brokerage and M&A advisory — Lehman formula, Double Lehman, Modified Lehman, flat percentage, and retainer-plus-success — with a live calculator that shows your specific fee at any deal size. Plus: who actually writes the cheque, when fees are paid, what is genuinely negotiable, and the red flags that should make you walk away from a broker engagement.
The number that usually surprises sellers: On a $2M business sale using a standard 10% flat-fee broker, the commission is $200,000 — 10% of what is often the largest single financial transaction of someone's life. On the same deal with a Modified Lehman formula, the fee drops to $60,000. Understanding which fee structure applies to your deal size is the most valuable 10 minutes of research you can do before signing an engagement letter.
1. Why Understanding Fees Matters
Broker fees reduce your net proceeds as a seller — directly. On a $1.5M business with a 10% commission, the broker earns $150,000. Your net before tax is $1,350,000. The fee is not a minor line item — it is the second-largest cost of the transaction after the capital gain itself.
As a buyer, fees matter because they affect the seller's asking price. A seller who needs $1.5M net after a 10% commission will list at $1.67M. The same seller who uses a flat-fee broker charging $40,000 can list at $1.54M for the same net outcome. Understanding broker fee structures helps buyers assess whether they are paying seller markup that reflects broker cost, not business value.
For sellers, the specific fee structure also determines what portion of your proceeds is subject to capital gains versus ordinary income treatment — particularly when retainers are involved. A $25,000 retainer paid upfront is treated differently for tax purposes than a $25,000 credit against the success fee at closing. Discuss the tax treatment of your broker's fee with your accountant before signing.
2. Who Pays a Business Broker?
Seller pays (80%+ of cases)
Standard arrangementThe seller pays the broker's success fee from sale proceeds at closing. The fee is wired from escrow to the broker simultaneously with the balance to the seller. The buyer never writes a cheque to the seller's broker.
Why sellers payThe listing broker represents the seller and earns their fee for successfully marketing and closing the sale. The commission is factored into the seller's asking price — but is legally the seller's obligation under the listing agreement.
Indirect buyer impactBuyers pay indirectly because the seller's asking price accounts for the commission. A 10% commission on a $1.5M asking price means the seller needs $1.5M to net $1.35M after fees — so the buyer is paying a price that reflects broker cost.
Buyer pays (buy-side advisory)
When buyers pay directlyBuyers who engage their own buy-side advisor — a broker representing only the buyer's interests — pay that advisor directly. This is common in LMM deals ($5M+) where buyers want exclusive representation. Rare at main street deal sizes.
Buy-side fee structureTypically a retainer ($10,000–$50,000) plus a success fee of 1–3% of enterprise value at closing. Some buy-side advisors work on a flat fee or success-only basis for specific search mandates.
Dual agency impactWhen the listing broker also assists the buyer (dual agency), the seller typically pays the full commission regardless. The buyer gets broker assistance at no direct cost — but the dual agency compromises the broker's advocacy for both parties.
3. Sell-Side Fee Structures Explained
The Lehman Formula (5-4-3-2-1)
The original Lehman Brothers fee structure for M&A advisory, developed in the 1970s and still used as a reference point. It charges 5% on the first $1M, 4% on the second $1M, 3% on the third, 2% on the fourth, and 1% on everything above $4M. On a $3M deal: $50K + $40K + $30K = $120,000 (4.0% effective). The Lehman formula was designed for deals in the $1M–$10M range. At today's deal sizes, it is considered generous to the seller on smaller deals and is rarely used as-written below $1M or above $10M.
The Double Lehman Formula (10-8-6-4-2)
Doubles each Lehman percentage. Common for main street businesses and smaller LMM deals where the absolute fee at Lehman rates would be too small to justify the broker's time. On a $1M deal: 10% flat = $100,000. On a $2M deal: $100K + $80K = $180,000 (9.0% effective). The Double Lehman is the basis for the "10% on small deals" convention most people have heard.
Modified Lehman (3-3-2-1-1) — The Current Standard for LMM
The most common structure for deals above $5M in the lower-middle-market. Uses larger tranches with lower percentages: 3% on the first $5M, 3% on $5M–$10M, 2% on $10M–$20M, 1% on amounts above $20M. On a $10M deal: $150K + $150K = $300,000 (3.0% effective). On a $20M deal: $150K + $150K + $200K = $500,000 (2.5% effective). See the full M&A advisor income guide →
Flat Percentage — Main Street Standard
A single percentage applied to the total transaction value. Common rates: 12–15% for deals under $300K, 10% for deals $300K–$1M, 8% for $1M–$2M, 6–7% for $2M–$5M. Simpler than the Lehman formula, easily understood by sellers and buyers, but less equitable across deal sizes — a 10% fee on $100K ($10K) is barely worth the broker's time; a 10% fee on $5M ($500K) may significantly exceed market rates for the work involved.
Minimum Fees
Almost all listing agreements include a minimum success fee — typically $15,000–$30,000 — regardless of the deal size. This protects the broker's economics on smaller deals where the percentage fee would be insufficient to justify time investment. A minimum fee of $20,000 on a $150,000 business sale represents a 13% effective rate. This is legitimate — representing a $150K business requires nearly the same work as a $500K business.
Retainer + Success Fee
M&A advisors for LMM deals ($5M+) typically charge a monthly retainer — commonly $10,000–$30,000/month for a 3–6 month exclusive engagement — in addition to the success fee at close. The retainer is usually credited against the success fee at closing (not an additional cost). Retainers serve two purposes: they ensure advisor compensation for the significant upfront work required before a deal closes, and they screen out sellers who are not serious (a seller willing to pay a retainer has genuine exit intent).
4. The Business Broker & M&A Advisor Fee Calculator
Interactive tool — 2026 fee estimates
Business Broker Fee Calculator
Enter your deal size (transaction value)
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5. Buy-Side Fee Structures
Do buyers usually pay? (Spoiler: rarely at main street)
At main street deal sizes ($100K–$2M), buyers almost never pay a direct broker fee. The listing broker represents the seller, earns their fee from the seller's proceeds, and may also assist the buyer in understanding the deal — but the buyer pays nothing directly to the listing broker. If the broker assists both sides (dual agency), the seller still typically pays the full commission.
Buy-side advisory at LMM and above
For deals above $5M — particularly PE acquisitions, corporate acquisitions, and search fund deals — buyers frequently engage their own buy-side advisor. The buy-side advisor's role is to identify target companies, manage the acquisition process, and negotiate exclusively on the buyer's behalf. Typical buy-side advisory fees: monthly retainer of $10,000–$50,000 for the search phase, plus a success fee of 1–3% of enterprise value at closing. Some buy-side advisors work success-fee-only for well-defined acquisition mandates where the search scope is narrow.
The "no win, no fee" buy-side search
Success-fee-only buy-side mandates exist but are uncommon — advisors willing to take a pure success fee on an acquisition search are either very confident in the deal pipeline or are taking a lower fee in exchange for removing downside risk for the buyer. Most established buy-side advisors require at least a minimum retainer to ensure the engagement is funded regardless of outcome, because acquisition searches frequently take 12–24 months.
6. When Are Fees Paid?
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Engagement signingRetainer (if any) — upfrontMain street brokers typically charge no upfront retainer. LMM M&A advisors typically charge $10,000–$30,000/month from signing, for 3–6 months. Retainers cover advisor time during the preparation and marketing phase and are credited against the success fee at closing.$0 (main street) · $30K–$180K (LMM advisor, 3–6 month retainer)
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Marketing phaseNo direct fee payments — retainer continues if applicableDuring the marketing period (typically 3–9 months), no additional fee payments are made. Some brokers charge for specific marketing expenses — listing site fees, virtual data room costs, information memorandum production — as pass-throughs separate from the commission. These are typically $1,000–$10,000 and should be disclosed in the engagement letter.$0 commission · Pass-through costs $1K–$10K (some brokers)
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Closing — the success feeSuccess fee paid from escrow at closingThe success fee is the primary compensation — typically 80–100% of total broker compensation. It is paid at the closing table directly from escrow, simultaneously with the seller's net proceeds. The success fee is calculated on the total transaction value per the fee formula in the engagement letter. Retainers previously paid are credited against the success fee.Full success fee per formula · Less any retainer credited
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Post-closingTrailing fees on earnouts and deferred paymentsIf the deal includes an earnout — a portion of the purchase price contingent on future performance — the broker typically earns their success fee percentage on earnout payments when they are received. This means the broker's commission on the earnout portion is paid years after closing, as earnout milestones are hit. This should be explicitly addressed in the engagement letter.Fee % × earnout payment when received
7. Broker vs M&A Advisor: Fee Differences
The terminology is confusing because it is used inconsistently. In practice, the distinction is primarily deal size and sophistication: "business brokers" typically handle main street and small businesses ($100K–$5M), while "M&A advisors" or "investment bankers" handle lower-middle-market and above ($5M–$500M+). The fee structures differ substantially.
Business brokers (main street): Flat percentage of 8–12% typical, no monthly retainer, minimum fee of $15,000–$25,000. Paid entirely at closing. Represent the seller in the transaction, may provide basic valuation but do not prepare sophisticated financial models. IBBA membership and CBI credential are the industry recognition marks.
M&A advisors (LMM, $5M–$50M): Monthly retainer of $10,000–$30,000 plus Modified Lehman success fee (effective rate 2–4%). Prepare full-length Confidential Information Memoranda, financial models, buyer outreach campaigns, and manage due diligence. More sophisticated service with correspondingly higher total cost. CM&AA credential from the Alliance of M&A Advisors or CBI from IBBA are the typical credentials.
Investment banks (middle market, $50M+): Monthly retainer plus success fees that can reach $1M–$5M+ per closed deal. Full institutional service with analyst teams, detailed management presentations, auction processes. Beyond the scope of most individual brokers or advisors.
8. How to Negotiate Broker Fees (Without Losing a Good Advisor)
Broker fees are negotiable — but not infinitely, and not every element is equally negotiable. Understanding which parts of the fee structure have legitimate flexibility and which do not makes negotiations productive rather than adversarial.
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Legitimate: Negotiate the success fee rate in exchange for exclusivityBrokers are more willing to reduce their success fee percentage when the engagement is exclusive — meaning you commit not to sell independently or through another broker during the engagement period. Exclusive mandates reduce the broker's risk of doing significant work without a commission. Offer a 90–180 day exclusive in exchange for a half-point reduction in the success fee. Reasonable ask, commonly accepted.
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Legitimate: Request a price threshold kicker structureRather than negotiating the base success fee down, propose an alternative structure: lower base rate + higher rate above a target price. Example: 7% base instead of 10%, but 15% on any proceeds above the agreed asking price. This aligns the broker's incentive with getting you more money, not just closing a deal. Most professional brokers prefer this to flat rate reductions.
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Legitimate: Negotiate the retainer credit and minimumFor LMM advisory engagements, negotiate that 100% of retainers paid are credited against the success fee (some advisors only credit 50%). Negotiate the minimum fee amount — a $25,000 minimum on a $200,000 business is reasonable; a $50,000 minimum on the same business is not. The minimum fee is genuinely negotiable in proportion to deal size.
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Not negotiable: Marketing and third-party costsListing site fees, virtual data room subscriptions, information memorandum production costs, and legal review of marketing materials are pass-through costs, not broker margin. Asking a broker to absorb these costs pushes them toward lower-quality marketing tools. These are typically $2,000–$10,000 total and should be disclosed upfront, not negotiated out of the engagement.
9. Red Flags and Hidden Costs to Watch For
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Large upfront fee with no track record or credentialsA legitimate broker who charges a retainer is typically an established M&A advisor with verifiable closed deals and professional credentials. A broker asking for $10,000–$25,000 upfront with no track record, no verifiable closed transactions, and no professional credentials (CBI, CM&AA, or state licence where required) should be evaluated very carefully. Upfront fee + no results = the most common business broker scam pattern. Verify closed deal history before paying any retainer.
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Success fee calculated on gross proceeds, not netIf the engagement letter says the success fee is calculated on "gross proceeds" or "enterprise value," confirm whether that includes assumed debt, inventory adjustments, and working capital. A deal structured as "$2M total consideration" but with $400K of assumed seller debt means the seller nets $1.6M before fees. A 10% fee on $2M gross is $200,000; a 10% fee on $1.6M net is $160,000. The difference matters. Negotiate to have the fee calculated on net proceeds to seller.
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Long tail provision with broad definitionThe tail provision (post-termination fee entitlement) in most engagement letters protects the broker if you fire them and then sell to a buyer they introduced. Standard tail periods of 12–24 months for buyers introduced during the engagement are reasonable. Watch for: (a) tail periods exceeding 24 months, (b) vague definitions of "introduced buyer" that could include anyone who saw any marketing material, (c) tail provisions that apply to buyers you found independently after the engagement. Negotiate the tail definition and period before signing.
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Hidden marketing pass-throughs not disclosed upfrontSome brokers charge for listing site subscriptions, virtual data room access, printed presentation materials, and professional photography — costs the seller only discovers when the first invoice arrives. These should be explicitly disclosed in the engagement letter, either as a capped pass-through or included in the commission. Any engagement that does not specify how marketing costs are handled leaves you open to unexpected charges during the marketing period.
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Non-refundable retainer with no performance milestoneA retainer is appropriate for LMM advisory engagements where significant upfront work is required. A non-refundable retainer with no stated deliverables or performance milestones — paid before any meaningful work has been done — is a different proposition. Legitimate retainers are tied to specific deliverables (preparation of the CIM, buyer outreach, management presentations). A retainer payment with no corresponding obligation from the advisor is effectively a non-refundable deposit with no performance commitment.
10. Fee Comparison Table — $500K to $10M
All four fee structures compared at key deal sizes. Numbers shown are the success fee at close (before any retainer credit).
← scroll to see all columns
Deal size
Flat % (main street)
Double Lehman (10-8-6-4-2)
Lehman (5-4-3-2-1)
Modified Lehman (3-3-2-1-1)
$300,000
$36,00012.0% eff.
$30,00010.0% eff.
$15,0005.0% eff.
$9,0003.0% eff. (min fee applies)
$500,000
$50,00010.0% eff.
$50,00010.0% eff.
$25,0005.0% eff.
$15,0003.0% eff. (min fee applies)
$1,000,000
$100,00010.0% eff.
$100,00010.0% eff.
$50,0005.0% eff.
$30,0003.0% eff.
$2,000,000
$160,0008.0% eff.
$180,0009.0% eff.
$90,0004.5% eff.
$60,0003.0% eff.
$5,000,000
$300,0006.0% eff.
$340,0006.8% eff.
$180,0003.6% eff.
$150,0003.0% eff.
$10,000,000
$500,0005.0% eff.
$480,0004.8% eff.
$230,0002.3% eff.
$300,0003.0% eff.
$25,000,000
$1,250,0005.0% eff.
$780,0003.1% eff.
$380,0001.5% eff.
$550,0002.2% eff.
The crossover point where Modified Lehman becomes more expensive than flat-percentage is around $7M–$10M. Above $10M, flat-percentage brokers charging 5% are significantly more expensive than LMM advisors using Modified Lehman. Below $5M, the flat percentage brokers charging 6–10% are consistently more expensive than Modified Lehman — but Modified Lehman is rare below $5M because most brokers at that deal size don't use LMM structures.
Surprised by What Brokers Earn? There's Another Side of This Transaction.
The fee calculator above shows what brokers earn per deal: $50,000–$300,000+ in success fees on mid-market transactions. Business brokers and M&A advisors earn these fees without putting any capital at risk, without a personal guarantee, and without owning the business. The Career Strategy Session maps your existing network to the first mandate where you are the one earning the fee — not paying it.
If you paid a retainer, that retainer is typically non-refundable regardless of whether the deal closes — it compensates the advisor for time invested during the preparation and marketing phase. The success fee is only paid if and when a deal closes. If the business does not sell and no retainer was paid, you typically owe nothing. If the business does not sell but you received a buyer introduction from the broker and later sell to that buyer outside the engagement (after the tail period expires), you also owe nothing — check the tail provision in your engagement letter for the specific timeline.
Legally, a buyer can contribute to or pay all of a broker's fee as part of a negotiated deal structure. In practice, this is uncommon — buyers who offer to pay the broker's fee typically do so in exchange for a reduction in the purchase price, which means the seller pays indirectly anyway. What is more common in dual-agency situations is the broker earning the full commission from the seller while also assisting the buyer at no additional charge. Disclosed dual agency with proper consent allows this structure — see the dual agency guide →
Business broker commissions paid by the seller are generally treated as a selling expense that reduces the seller's amount realised from the sale — reducing the taxable capital gain rather than being deducted as a business expense in the year of payment. The effective tax impact is similar: the commission reduces the gain subject to capital gains tax. The specific treatment depends on whether the sale is structured as an asset sale or stock sale, and how the purchase price is allocated across asset classes. Consult a qualified tax advisor for the specific treatment in your transaction.
For a $2M business, typical success fees: Flat percentage (main street broker) at 8% = $160,000. Double Lehman = $180,000. Standard Lehman = $90,000. Modified Lehman (uncommon at this deal size, but available) = $60,000. The most common structure for a $2M deal in 2026 is a flat percentage of 8–10%, producing a success fee of $160,000–$200,000. Minimum fees of $15,000–$25,000 apply but are irrelevant at this deal size. The minimum fee matters more for deals under $300,000 where the percentage fee would otherwise be less than the minimum.
Ask for: (1) a list of closed transactions in the last 3 years — business type, approximate sale price, and time from engagement to close; (2) references from sellers on at least 2 closed deals; (3) verification of professional credentials (CBI number with IBBA, CM&AA with AMAA, or state real estate licence number where applicable). Professional credentials are publicly verifiable. IBBA CBI holders can be verified at the IBBA member directory. State real estate licences are publicly searchable through each state's licensing board. A broker unable or unwilling to provide verifiable closed deal history and professional credentials should not receive a non-refundable retainer or an exclusive engagement.
About the Author
Den UnglinBroker · M&A Adviser
These are the fee structures Den uses and negotiates on active deals.
The fee calculator reflects real fee structures used in current US and international business brokerage practice. The comparison table figures are verified against the formula calculations — not approximated. The negotiation section reflects actual engagement letter negotiations, not general principles.
Den is a practising business broker and M&A exit adviser with 18+ years of direct P&L experience across 50+ business types and 12 markets.
