Understanding M&A Advisory Fees in 2026 — A Guide for Business Owners

If you’re preparing to sell your business, one of the first questions you’ll face is: What should I expect to pay an M&A advisor?

It’s a fair question — and until recently, it was hard to answer with real data. The M&A market has historically lacked transparency around fees. That’s changing.

The 2025/26 Axial M&A Fee Guide — based on 331 advisors across the lower middle market — gives us the most current, comprehensive picture available. Here’s what it means for business owners.

The Benchmark: What Success Fees Look Like Today

Success fees — the commission paid at closing — remain the primary way M&A advisors are compensated. Here are the average effective rates from the guide:

Key takeaway: fees have held firm or crept upward across most brackets compared to 2024. In a market where deals are taking longer and sellers are harder to find, advisors haven’t cut rates — which suggests the market is pricing execution risk correctly.

How Fees Are Structured: Three Common Models

1. Lehman Formula (43% of advisors)

The classic: a declining percentage based on transaction value tiers. Most commonly, the Double Lehman variant:

• 10% on the first $1M
• 8% on the next $1M
• 6% on the next $1M
• 4% on the next $1M
• Negotiable above $4M

2. Flat Percentage (36% of advisors — up from 26%)

A single percentage applied to the entire transaction value. This is the fastest-growing structure — owners increasingly want simplicity and predictability.

3. Accelerator / Hybrid (13%)

The fee percentage increases above a certain valuation threshold. This aligns incentives when an advisor outperforms on valuation.

Engagement Fees: The Upfront Question

70% of advisors charge some form of upfront work fee. Here’s the breakdown:

• Monthly retainer (29%): Most common band is $5K–$10K/month. Notably, the share billing over $25K/month nearly quadrupled (3% → 11%).
• One-time fixed retainer (31%): The $16K–$25K band jumped from 9% to 22%.
• Success-fee-only (29%): Up from 19% last year. More advisors are willing to work without an upfront fee.

What you should know: The vast majority (77%) credit engagement fees against the success fee at closing. So that monthly retainer isn’t an extra cost — it’s an advance against the ultimate commission.

Minimum Success Fees: Nearly Universal

79% of advisors include a minimum success fee in their engagement agreements. This protects the advisor if the transaction is smaller than anticipated — a floor that triggers regardless of deal size.

For owners: this is a standard, reasonable term. The key is understanding where the floor is set and whether it aligns with realistic outcomes.

Capital Raise Fees: A Different Curve

If you’re raising capital rather than selling outright, the fee structure compresses differently:

Notice the shallower decline — capital raise fees hold up better at larger sizes than M&A fees do.

What Drives Fee Levels?

According to the survey, advisors weigh these factors when setting fees:

What jumps out: bake-offs rarely move the needle. Only 9% of advisors say competitive pressure is “very important” in setting fees. The deal itself — its risk, size, and complexity — drives pricing, not how many other firms are pitching.

The Fine Print: Expenses, Timing, and Break-Up Fees

Success fee timing: 50% of advisors are paid in full at closing. 33% use a combination approach. Only 17% tie payment to when the seller actually receives funds (e.g., earnout payments).

Reimbursable expenses:

• Travel & accommodation: 48% reimburse
• VDR fees: 17% reimburse
• 50% reimburse nothing — all costs absorbed by the advisor

Break-up fees: Only 26% of advisors charge a break-up fee if a client rejects a bona fide offer. This is uncommon but worth knowing about.

Market Forces Shaping Fees Right Now

1. Valuation Gaps

The #1 headwind cited by advisors. Buyers remain disciplined; sellers hold to pre-uncertainty valuations. This widens bid-ask spreads and makes closings harder.

2. AI Pressure

For the first time in the survey, AI emerged as a direct fee pressure point. Clients arrive with AI-generated valuations. Some competitors use AI to undercut on pricing. Most advisors remain confident that judgment, relationships, and process management can’t be replicated — but the market is watching.

3. Sell-Side Deal Flow

32% of advisors cited “sell-side deal flow & quality” as their single biggest challenge. There’s a shortage of prepared business owners coming to market. For owners who are prepared, this is an advantage.

What This Means for You

If you’re a business owner evaluating an M&A advisor:

1. Don’t lead with fee. The difference between using a a good advisor and doing it yourself can be 10–40% on valuation and a materially higher close rate. The fee is a fraction of that outcome.
2. Understand the structure, not just the number. A Lehman formula vs. flat percentage vs. accelerator — these produce very different economics at different sale prices. Model it.
3. Ask about the retainer. Whether it’s credited against the success fee and whether there’s a minimum success fee are more important than the retainer amount itself.
4. Consider the whole engagement. Experience, industry fit, chemistry, and process rigor matter more than who’s cheapest.
5. The market rewards preparation. The firms winning mandates today are the ones who can articulate their value proposition clearly and demonstrate a repeatable process. That cuts both ways — owners who come to market prepared get better terms and better outcomes.