Understanding M&A Fees: Lehman Formula and Modern Fee Structures Explained

In the world of mid-market business exits, most conversations naturally revolve around enterprise value, EBITDA multiples, and net proceeds. However, there is a critical component of the transaction that often remains shrouded in mystery until the engagement letter is on the desk: the M&A advisor fee structure.

For many founders, the way an investment bank or M&A firm charges for its services can feel opaque. At Fast Forward Business Advisors (FFBA), we believe that transparency is the bedrock of a successful partnership. A misunderstanding of how fees are calculated doesn't just lead to surprises at the closing table—it can fundamentally misalign the incentives between you and your advisor.

This guide is designed to pull back the curtain on understanding M&A fees, explaining the historical roots of the Lehman Formula, and detailing how modern fee structures ensure that your advisor is incentivized to fight for every dollar of your valuation.

1. Why Fee Transparency Matters

When you are preparing to sell a company valued between $5M and $100M, the stakes are incredibly high. This is likely the single largest financial event of your life. While it is tempting to focus solely on the headline sale price, the structure of the fees you pay to get there matters just as much as the amount.

Misunderstanding these fees can erode your net proceeds or, worse, lead to a "transactional" relationship where an advisor is more interested in closing any deal than closing the right deal. At FFBA, we position ourselves as alignment-focused partners. We want our clients to understand exactly how we are paid, why we are paid that way, and how it protects their interests throughout the "Seller’s Journey."

2. How M&A Advisors Typically Get Paid

Most professional M&A advisory engagements are built on a "hybrid" model. This ensures the firm can dedicate the necessary senior-level resources to your project while keeping the "lion’s share" of the compensation tied to a successful outcome.

There are three primary components to how M&A advisors get paid:

A. The Retainer Fee (Commitment Fee)

This is an upfront payment made at the start of the engagement.

• Purpose: It covers the initial heavy lifting, including financial modeling, the creation of the Confidential Information Memorandum (CIM), and buyer research.
• Example: A $25,000 to $50,000 upfront fee to begin the formal "market-ready" process.

B. Monthly Work Fees (Monthly Retainers)

Some firms charge a recurring monthly fee for a set period (e.g., the first 6 months).

• Purpose: This ensures the firm can maintain a dedicated team for your deal, which often takes 6–12 months to close. In many cases, these fees are credited back against the final success fee.
• Example: $5,000 per month for the duration of the engagement.

C. The Success Fee

This is the most significant portion of the compensation. It is a percentage of the total transaction value paid only when the deal successfully closes.

• Purpose: To align the advisor’s goals with the owner's goals: maximizing price and certainty of closing.
• Example: A percentage (e.g., 2% to 5%) of the final sale price.

3. The Original Lehman Formula Explained

If you’ve spent any time researching sell-side advisory fees, you’ve likely heard of the "Lehman Formula." Named after the venerable (and now defunct) Lehman Brothers, this formula was created in the 1960s to standardize fees for corporate finance transactions.

The Classic “5-4-3-2-1” Structure

The original Lehman Formula is a regressive scale. As the deal size increases, the percentage charged on each incremental "slice" of the value decreases.

• 5% of the first $1,000,000
• 4% of the second $1,000,000
• 3% of the third $1,000,000
• 2% of the fourth $1,000,000
• 1% of everything thereafter

Step-by-Step Numerical Example

If you sold your business for $10,000,000 under the classic Lehman Formula, the calculation would look like this:

1. 5% of $1M = $50,000
2. 4% of $1M = $40,000
3. 3% of $1M = $30,000
4. 2% of $1M = $20,000
5. 1% of the remaining $6M = $60,000

• Total Success Fee: $200,000 (Effective rate: 2.0%)

Why It Became the Industry Standard

For decades, the Lehman Formula provided a clear, predictable framework. However, as inflation rose and the complexity of mid-market deals increased, the "1% thereafter" became insufficient to cover the high costs of running a global, competitive M&A process. This led to the modern variations we see today.

4. Modern Lehman Variations

In the current mid-market landscape ($5M–$100M), the "Classic Lehman" is rare. Most firms, including FFBA, use evolved versions to better reflect the effort required in today's regulatory and competitive environment.

The Double Lehman

As the name suggests, this simply doubles the percentages of the original formula (10-8-6-4-2). It is often used for smaller deals (under $10M) where the work required is still significant, but the total deal size is lower.

The Modified Lehman

This is the most common structure in the mid-market. It might look like a "3-2-1" or a flat percentage with a "kicker." For example:

• 2% on the first $20M
• 1.5% on everything above $20M

Flat Percentage Models

Many boutique firms have moved away from "slices" entirely, charging a flat percentage (e.g., 3% or 4%) regardless of the deal size. This is simpler for the owner to calculate but provides less of a "volume discount" as the deal grows.

The "Incentive Scaler" (Hybrid Structure)

At FFBA, we often discuss "scaled" fees. If an owner wants $30M but we believe the market might pay $35M, we might set a base fee of 2% up to $30M, and a "kicker" of 5% on every dollar achieved above that target. This creates ultimate alignment: we only get a premium if we deliver a premium result.

5. What Drives Fee Negotiation in the Mid-Market?

No two businesses are the same, and therefore, no two fee structures should be identical. Several factors influence how M&A advisor fee structures are set:

• Deal Size: Generally, the larger the deal, the lower the percentage. A $5M deal might carry a 5% fee, while a $100M deal might carry a 1% to 1.5% fee.
• Industry Complexity: Selling a high-growth SaaS company with global intellectual property is more complex than selling a local distribution center. Complex deals require more specialized labor.
• Company Readiness: If your books are clean and your management team is strong, the advisor's job is easier. If the advisor has to act as a "shadow CFO" to get the data ready, the retainer or work fees will likely be higher.
• Expected Buyer Universe: Is this a local sale to a competitor, or a global search involving hundreds of Private Equity firms? A broader search requires more resources.

6. Alignment vs. Misalignment: What Smart Sellers Watch

The most common mistake a business owner can make is choosing an advisor based on the lowest fee. In M&A, you truly get what you pay for.

The Danger of the "Cheap" Advisor

If an advisor offers a 1% fee on a $10M deal, they are likely "churning" deals. They cannot afford to spend 80 hours a month on your transaction; they need to close it quickly and move on. This often results in "leaving money on the table." If a better advisor charges 3% but gets you a price that is 15% higher, the "expensive" advisor is actually the more profitable choice for you.

Questions to Ask Your M&A Advisor:

• "How many people will be dedicated to my deal, and what is their experience level?"
• "Is your success fee purely a percentage, or do you have a minimum fee?"
• "Which expenses are reimbursed, and is there a cap on those expenses?"
• "What happens to the fee if the deal structure involves an earn-out or equity roll?"

7. An experienced M&A advisor’s Philosophy on Fee Structures

At an experienced M&A advisor, we don't believe in "cookie-cutter" pricing. Our philosophy is built on three pillars:

• Transparency First: We explain every decimal point before a contract is signed. No hidden "administrative fees" or "marketing surcharges."
• Outcome Alignment: We prefer structures that reward us for exceeding your expectations. If we deliver a "home run" valuation, we want to share in that success; if we don't, our compensation should reflect that.
• Senior-Level Execution: We are a boutique firm. You aren't paying a high fee only to be handed off to a junior analyst. Your fee ensures that a senior partner is leading every negotiation.

8. Common Fee Mistakes Business Owners Make

Avoid these pitfalls when evaluating an M&A engagement letter:

• Fixating on the Percentage: Focus on the net proceeds (Sale Price minus Fees/Taxes). A 4% fee on a $25M sale is better than a 2% fee on a $20M sale.
• Ignoring Minimum Success Fees: Most mid-market firms have a "floor" (e.g., "The fee shall be 3% or $250,000, whichever is greater"). Ensure you know where your floor is.
• The "Tail" Provision: Almost all M&A contracts have a "tail" (usually 12–24 months). If you fire the advisor but sell to a buyer they introduced during the contract, you still owe the fee. This is standard, but you should understand the duration.
• Choosing Brokers Instead of Advisors: Main-street business brokers often charge flat 10% fees but lack the sophistication to handle $10M+ deals involving Private Equity or complex tax structures.

9. Example Scenario: The $25M Exit

Let’s look at how different structures impact a $25,000,000 enterprise value sale.

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The Takeaway: Notice the "experienced M&A advisor Style" hybrid. While the total fee is higher than the Classic Lehman, it reflects a modern market where the advisor is highly incentivized to push the value from $20M to $25M. The owner "pays more" but keeps millions more in their pocket because the advisor was motivated to hunt for the premium.

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Final Takeaway — Fees Should Drive Results, Not Surprises

A sale of your business is a high-stakes chess match. Your M&A advisor is your grandmaster. When understanding M&A fees, remember that the structure exists to ensure your advisor has the resources to build a competitive market for your company.

The best fee structure is one where the advisor only wins when you win "big." Proper alignment increases the likelihood of a premium outcome and ensures that both parties are rowing in the same direction from the first meeting to the final wire transfer.

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M&A advisory fee structures considerations are particularly relevant for business owners across Northeast Ohio — Cleveland, Chagrin Falls, Cuyahoga County, and Geauga County — where a high concentration of privately held businesses in the $1M–$5M revenue range operate across industrial, services, and trades sectors. Owners in this market deserve advisors who understand both the transaction and the regional context in which it occurs.

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Business owners across Northeast Ohio evaluating M&A advisors engage Ben Calkins for a transparent fee conversation — because understanding how an advisor gets paid is the first step in understanding whether their interests are actually aligned with yours.

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Ben Calkins | Fast Forward Business Advisors

M&A Advisory — Northeast Ohio

Call directly: 440-595-4300

Schedule a Confidential Consultation

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