Business Broker & M&A Advisor Fees · What Owners Pay · 2026
What Business Owners Pay a Broker or M&A Advisor: 2026 Fee Guide + Calculator
Den Unglin11 min read
The fee you pay a business broker or M&A advisor is the most misunderstood cost in any business sale. Owners routinely overestimate it on small deals and underestimate it on large ones. Buyers assume they pay nothing — and are occasionally surprised to find they pay indirectly, or directly if they have hired their own 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 cost at any deal size. Plus: who actually writes the cheque, when fees are due, what is genuinely negotiable, and the red flags that should make you walk away from an engagement.
The number that usually surprises owners: On a $2M business sale with 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 under a Modified Lehman formula, the fee is $60,000. Knowing which structure applies to your deal size is the most valuable 10 minutes of research you can do before signing an engagement letter. (8–12% main street rate: BizBuySell, IBBA.)
1. Why Understanding the Cost Matters
The fee reduces your net proceeds as an owner — directly. On a $1.5M business with a 10% commission, the fee is $150,000, leaving $1,350,000 before tax. It is the second-largest cost of the transaction after the capital-gains liability itself.
As a buyer, the fee matters because it sits inside the seller's asking price. A seller who needs $1.5M net after a 10% commission will list at roughly $1.67M. The same seller using a flat-fee broker charging $40,000 can list at $1.54M for the same net outcome. Understanding the fee structure helps a buyer see how much of the price reflects advisory cost rather than business value.
The structure also affects tax. A $25,000 retainer paid upfront is treated differently from a $25,000 credit against the success fee at closing. Discuss the tax treatment of the 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 at the same time as the balance to the seller. The buyer never writes a cheque to the seller's broker.
Why the seller paysThe listing broker represents the seller and is paid for successfully marketing and closing the sale. The commission is built into the asking price, but is legally the seller's obligation under the listing agreement.
Indirect buyer impactThe buyer pays indirectly because the 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 the fee — so the buyer pays a price that reflects the advisory cost.
Buyer pays (buy-side advisory)
When the buyer pays directlyA buyer who hires their own buy-side advisor — representing only the buyer's interests — pays that advisor directly. Common in lower-middle-market deals ($5M+) where buyers want exclusive representation. Rare at main street sizes.
Buy-side fee structureA monthly retainer plus a success fee of 0.5%–2.0% of transaction value at closing — typically lower than the sell-side fee (DealRoom). Some buy-side advisors work success-only on narrow search mandates.
Dual agencyWhen the listing broker also assists the buyer (dual agency), the seller typically pays the full commission regardless. The buyer gets assistance at no direct cost — but dual agency weakens the broker's advocacy for both sides.
3. Sell-Side Fee Structures Explained
Flat percentage — main street standard
A single percentage applied to the total transaction value. Main street businesses (under $1M) typically pay 8–12%, with most brokers charging 10%; the rate steps down for larger deals (BizBuySell; IBBA). It is simple and easily understood, but less equitable across sizes — 10% on $100K ($10K) barely covers the broker's time, while 10% on $5M ($500K) can exceed market rates for the work involved.
Minimum fees
Almost every listing agreement includes a minimum success fee — typically $10,000–$25,000 — regardless of deal size (Morgan & Westfield). This protects the broker on small deals where the percentage alone would be too low. A $20,000 minimum on a $150,000 sale is a 13% effective rate, which is legitimate: representing a $150K business takes nearly the same work as a $500K one.
The Lehman formula (5-4-3-2-1)
The original Lehman Brothers structure, from the 1970s, still used as a reference point. It charges 5% on the first $1M, 4% on the second, 3% on the third, 2% on the fourth, and 1% above $4M. On a $3M deal: $50K + $40K + $30K = $120,000 (4.0% effective). Designed for $1M–$10M deals; rarely used as-written below $1M or above $10M today (Founders Advisors).
The Double Lehman formula (10-8-6-4-2)
Doubles each Lehman rate. Common for main street and smaller LMM deals where Lehman rates would produce a fee too small to justify the work. Worked example: a $5M deal = $100K (10% on the first $1M) + $80K + $60K + $40K + $20K (2% above $4M) = $300,000 (Morgan & Westfield). This is the basis for the "10% on small deals" convention.
Modified Lehman (3-3-2-1-1) — the current LMM standard
The most common structure for deals above $5M. Larger tranches, lower percentages: 3% on the first $5M, 3% on $5M–$10M, 2% on $10M–$20M, 1% above $20M. On a $10M deal: $150K + $150K = $300,000 (3.0% effective). On a $20M deal: $500,000 (2.5% effective) (Auxo Capital Advisors).
Retainer (work fee) + success fee
For LMM deals ($5M+), advisors charge a monthly retainer — commonly $10,000–$50,000/month over a 3–6 month engagement — on top of the success fee, usually credited against it at closing (Auxo Capital Advisors). The retainer covers significant upfront work and screens out owners who are not serious. It is also called a work fee, engagement fee, or upfront fee (Founders Advisors).
4. The Business Broker & M&A Advisor Fee Calculator
Interactive tool — 2026 fee estimates
What Will the Fee Cost You?
Enter your deal size (transaction value)
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Select fee structure
Estimates only. Flat-tier breakpoints are a composite of cited ranges (BizBuySell, Morgan & Westfield) and vary by broker. Modified Lehman + retainer figures: Auxo Capital Advisors.
5. What a Buyer Pays
The "who pays" question has a second side: the buyer. It is a smaller share of transactions, but it is the same cost question — what does hiring representation cost the person who hires it — so it belongs here, kept separate from the seller-pays case above.
At main street sizes, the buyer usually pays nothing directly
At $100K–$2M, buyers almost never pay a direct broker fee. The listing broker represents the seller, is paid from the seller's proceeds, and may still help the buyer understand the deal — at no direct charge. If the broker assists both sides (dual agency), the seller typically still pays the full commission.
Buy-side advisory at LMM and above ($5M+)
For deals above $5M — private-equity buyers, corporate acquirers, search funds — buyers frequently hire their own buy-side advisor to find targets, manage the process, and negotiate exclusively on their behalf. Typical cost: a monthly retainer (deal-size dependent) plus a success fee of 0.5%–2.0% of transaction value at closing, generally lower than the sell-side fee (DealRoom). Some buy-side advisors work success-only 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 taking a pure success fee on a search are either very confident in the pipeline or accepting a lower fee in exchange for removing the buyer's downside. Most established buy-side advisors require at least a minimum retainer, because acquisition searches often run 12–24 months and the engagement needs to be funded regardless of outcome.
Engagement signingRetainer (if any) — upfrontMain street brokers usually charge no upfront retainer. LMM advisors charge $10,000–$50,000/month from signing, for 3–6 months, covering preparation and marketing work, credited against the success fee at closing (Auxo Capital Advisors).$0 (main street) · retainer credited at close (LMM)
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Marketing phaseNo new fee payments — retainer continues if applicableDuring marketing (typically 3–9 months) no additional fee is due. Some brokers pass through specific costs — listing-site fees, data-room costs, information-memorandum production. These should be disclosed in the engagement letter.$0 commission · pass-through costs disclosed upfront (flag)
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Closing — the success feeSuccess fee paid from escrow at closingThe success fee is the bulk of the cost — paid at the closing table from escrow, at the same time as the seller's net proceeds, calculated on transaction value per the formula in the engagement letter. Any retainer already paid is credited against it.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 — part of the price contingent on future performance — the fee percentage typically applies to earnout payments as they are received, years after closing. This should be addressed explicitly in the engagement letter.Fee % × earnout payment when received
7. Broker vs M&A Advisor: Fee Differences
The terms are used inconsistently. In practice the split is deal size and sophistication: "business brokers" handle main street and small businesses ($100K–$5M); "M&A advisors" handle the lower-middle-market and above ($5M–$500M+). The cost structures differ.
Business brokers (main street): flat 8–12%, no monthly retainer, minimum fee $10,000–$25,000, paid entirely at closing. Provide basic valuation but not sophisticated financial models. CBI (IBBA) is the recognition mark.
M&A advisors (LMM, $5M–$50M): monthly retainer $10,000–$50,000 plus a Lehman/Modified Lehman success fee (effective ~2–5%). Prepare full Confidential Information Memoranda, financial models, buyer outreach, and manage diligence. Higher total cost for a more involved service. CM&AA or CBI typical credentials.
Investment banks (middle market, $50M+): monthly retainer plus success fees that can reach $1M–$5M+ on a closed deal. Full institutional service with analyst teams and auction processes — beyond the scope of most individual brokers.
8. How to Negotiate the Fee (Without Losing a Good Advisor)
Fees are negotiable — but not infinitely, and not every element equally. Knowing which parts have legitimate flexibility keeps the conversation productive rather than adversarial.
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Legitimate: lower the success-fee rate in exchange for exclusivityBrokers will reduce the percentage when the engagement is exclusive — you commit not to sell independently or through another broker during the term. Offer a 90–180 day exclusive for a half-point reduction. Commonly accepted.
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Legitimate: a price-threshold kickerInstead of cutting the base rate, propose a lower base + higher rate above a target price. Example: 7% base instead of 10%, but 15% on proceeds above the agreed asking price. Aligns the broker with getting you more, not just closing. Most professionals prefer this to a flat cut.
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Legitimate: the retainer credit and the minimumFor LMM engagements, push for 100% of retainers credited against the success fee (some advisors credit only 50%). The minimum fee is negotiable in proportion to deal size — a $25,000 minimum on a $200,000 business is reasonable; $50,000 is not.
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Not negotiable: marketing and third-party costsListing-site fees, data-room subscriptions, information-memorandum production and legal review of marketing materials are pass-through costs, not broker margin. Asking the broker to absorb them pushes toward lower-quality tools. They should be disclosed upfront, not negotiated out.
9. Red Flags and Hidden Costs to Watch For
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Large upfront fee with no track record or credentialsA legitimate retainer comes from an established advisor with verifiable closed deals and credentials. A broker asking $10,000–$25,000 upfront with no closed-deal history and no credentials (CBI, CM&AA, or state licence where required) is the most common scam pattern. Verify closed-deal history before paying any retainer.
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Fee calculated on gross proceeds, not netIf the letter says the fee is on "gross proceeds" or "enterprise value," confirm whether that includes assumed debt, inventory adjustments and working capital. A "$2M total consideration" deal with $400K of assumed seller debt nets $1.6M before fees. 10% on $2M gross is $200,000; 10% on $1.6M net is $160,000. Negotiate the fee onto net proceeds to seller.
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Long tail provision with a broad definitionThe tail (post-termination fee entitlement) protects the broker if you fire them and then sell to a buyer they introduced. 12–24 months for buyers introduced during the engagement is standard. Watch for: tails over 24 months, vague "introduced buyer" definitions, or tails that cover buyers you found yourself. Negotiate the definition and period before signing.
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Hidden marketing pass-throughs not disclosed upfrontSome brokers bill listing-site subscriptions, data-room access, printed materials and photography — discovered only when the invoice arrives. These should be specified in the engagement letter as a capped pass-through or included in the commission. Silence on marketing costs leaves you open to surprise charges.
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Non-refundable retainer with no performance milestoneA retainer is appropriate for LMM work requiring significant upfront effort. A non-refundable retainer with no stated deliverables — paid before any meaningful work — is just a deposit with no obligation. Legitimate retainers are tied to deliverables (CIM, buyer outreach, management presentations).
10. Fee Comparison Table — $300K to $25M
All four structures compared at key deal sizes. Figures are the success fee at close (before any retainer credit), calculated directly from each formula and matched to the live calculator above.
← 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.
$15,0005.0% eff. (min fee)
$500,000
$50,00010.0% eff.
$50,00010.0% eff.
$25,0005.0% eff.
$15,0003.0% eff. (min fee)
$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.
$300,0006.0% eff.
$150,0003.0% eff.
$150,0003.0% eff.
$10,000,000
$500,0005.0% eff.
$400,0004.0% eff.
$200,0002.0% eff.
$300,0003.0% eff.
$25,000,000
$1,250,0005.0% eff.
$700,0002.8% eff.
$350,0001.4% eff.
$550,0002.2% eff.
Read it this way: Modified Lehman produces the lowest fee at any given size, but is generally only offered on $5M+ deals — so below $5M your real choice is between flat percentage and Double Lehman, which converge near 9–10% on sub-$2M deals. Above $10M, a flat-percentage broker charging 5% costs noticeably more than an advisor on Modified Lehman. Knowing the crossover lets you ask for the structure that fits your size.
Selling Your Business? Know the Fee Before You Sign.
The structure you accept in the engagement letter decides how much of your sale proceeds you keep. If you are preparing an exit in the $1M–$50M range and want the fee, retainer, credit and tail terms structured in your favour from day one, UNGLIN advises owners through that process directly.
If you paid a retainer, it is typically non-refundable whether or not the deal closes — it compensates the advisor for time during preparation and marketing. The success fee is only due if and when a deal closes. If no retainer was paid and the business doesn't sell, you typically owe nothing. If you later sell to a buyer the broker introduced, check the tail provision in your engagement letter for the timeline.
A buyer can contribute to or cover the fee as part of a negotiated structure, but it is uncommon — buyers who offer to do so usually want a matching reduction in price, so the seller pays indirectly anyway. More common in dual agency: the broker is paid the full commission by the seller while also assisting the buyer at no extra charge. Disclosed dual agency with proper consent allows this — see the dual agency guide →
Broker commissions paid by the seller are generally treated as a selling expense that reduces the amount realised from the sale — reducing the taxable capital gain rather than being deducted as a business expense in the year of payment. The specific treatment depends on whether the sale is an asset sale or stock sale and how the price is allocated across asset classes. Consult a qualified tax advisor for your transaction.
On a $2M business: flat percentage (8%) = $160,000; Double Lehman = $180,000; standard Lehman = $90,000; Modified Lehman (uncommon at this size) = $60,000. The most common 2026 structure for a $2M deal is a flat 8–10%, so $160,000–$200,000. Minimum fees of $15,000–$25,000 apply but are irrelevant at this size — they matter mainly below $300,000.
Ask for: (1) a list of closed transactions in the last 3 years — business type, approximate price, time from engagement to close; (2) references from sellers on at least 2 closed deals; (3) verification of credentials (CBI number with IBBA, CM&AA with AMAA, or state real-estate licence number where applicable). Credentials are publicly verifiable. A broker unwilling to provide closed-deal history and 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 calculator reflects real fee structures used in current US and international practice. The comparison-table figures are computed directly from each formula and cross-checked against published benchmarks (BizBuySell, Morgan & Westfield) — not approximated.
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.
