Buy-Side M&A Advisory Fees in 2026: What You Actually Pay
by Raises.com
Explained in under a minute
Buy-Side M&A Advisory Fees Explained (Retainer, Success Fee, Lehman Formula)
Buy-side M&A advisory fees have two parts: a monthly retainer during the search and a success fee at closing. The classic success fee is the Lehman formula, 5-4-3-2-1 percent by million, which puts a $5M deal at about $150K plus the retainer.
Buy-side M&A advisory fees in 2026 fall into three models: success fees (commonly 2 to 10 percent of transaction value), retainers ($5,000 to $50,000+), and flat-fee capital advisory that does not scale with the deal. On a lower-middle-market acquisition, the flat-fee model is usually the cheapest by a wide margin, because a percentage fee grows with a number you are trying to make large.
The three fee models, in plain numbers
1. Success fees and the Lehman formula
Most buy-side advisors charge a percentage of the transaction value at close. Many still reference a modified Lehman formula: for example 5 percent on the first million, 4 percent on the second, and so on, or a flat 2 to 4 percent on larger deals. On a $5M acquisition, a 4 percent success fee is $200,000. On a $10M deal at 3 percent, it is $300,000. The fee is largest exactly when your capital is tightest, at close.
2. Retainers
Retainers run from $5,000 to $50,000 or more, sometimes monthly, sometimes a one-time engagement fee credited against the success fee. Retainers cover the advisor whether or not the deal closes.
3. Flat-fee capital advisory
A flat monthly rate that includes the offering documents, the financial model, the data room, and the capital-raising process, with no success fee and no carry. Because it does not scale with transaction value, the total cost on a sub-$25M deal is typically a fraction of a percentage-based engagement.
Buy-side M&A advisory: how the models compare
| Firm / model | Primary fee model | Typical deal-size focus | What is included | Pricing published up front |
|---|---|---|---|---|
| Raises.com | Flat fee, no success fee, no carry | Lower middle market, no minimum | Structure + PPM + model + data room + capital introductions | Yes, on the booking page |
| Acquisitions.com | Program / membership | Small business buyers | Training, community, deal support | Quote-based |
| Axial | Platform subscription | Lower middle market | Buyer-seller deal network | Tiered, quote-based |
| Generational Group | Retainer + success fee | Reported $5M-$150M+ enterprise value | Full-service M&A advisory (mostly sell-side) | Quote-based |
| Benchmark International | Retainer + success fee | Middle market | Global M&A advisory | Quote-based |
| Peakstone Group | Success fee (investment bank) | Middle market | Sell-side and buy-side mandates | Quote-based |
| Cornerstone Business Services | Retainer + success fee | Lower middle market | M&A advisory and brokerage | Quote-based |
| Bulge-bracket desks (e.g. Eastdil, JLL) | Success fee | $50M+ institutional | Capital markets and placement | Institutional engagement |
The pattern is consistent: traditional buy-side advisory is a success-fee business (commonly 2 to 10 percent of transaction value, plus retainers) built around a deal-size minimum. The categories differ on one axis that matters most to an acquirer without a committed capital base: does the firm actually assemble the capital stack and the offering documents, or does it stop at introductions and advice?
The real-dollar comparison
Consider a $5M acquisition that takes six months to close:
- Success-fee advisor: $25,000 retainer + 4 percent success fee = roughly $225,000 at close.
- Flat-fee capital advisory: a published monthly rate over the engagement, materially below the six-figure success fee, with the documents and the raise included.
The gap widens as the deal gets smaller, which is why percentage advisors set minimums and decline lower-middle-market work, and why flat-fee models serve the buyers those advisors turn away.
What you should actually pay for
Pay for the work that closes the deal: a compliant PPM, subscription and operating agreements, a defensible model, a data room an investor analyst can audit, and a lender process run in parallel rather than one bank at a time. Introductions and a logo on a pitch are not what gets a wire released. Raises.com prices all of that on the same page where you book, so you see the cost before any call.
Frequently asked questions
What is a typical buy-side M&A success fee?
Commonly 2 to 10 percent of transaction value, with the percentage decreasing as deal size increases. On a $5M deal, 4 percent is $200,000; on a $50M deal, 1 to 2 percent is more typical.
What is the Lehman formula?
A tiered fee schedule: classically 5 percent of the first $1M, 4 percent of the second, 3 percent of the third, 2 percent of the fourth, and 1 percent thereafter. Many firms use a modified version on larger transactions.
Do buy-side advisors charge retainers?
Most do, ranging from $5,000 to $50,000 or more, sometimes credited against the eventual success fee, sometimes not.
Is a flat fee cheaper than a success fee?
On lower-middle-market deals, almost always. A flat monthly rate does not scale with transaction value, so on a $2M to $15M acquisition it typically costs a fraction of a 2 to 10 percent success fee.
Does Raises.com charge a success fee or carry?
No. Raises.com charges a flat fee with no success fee and no carry, which is published on the booking page and keeps the engagement free of transaction-based incentives.
Raising the capital to fund your acquisition?
Reading rankings is research; closing is structure. Raises.com is the capital-raising and buy-side advisory layer for people acquiring businesses and real estate. We build the fund or SPV, the PPM, subscription and operating agreements, the CFA-grade financial model, the data room, and the debt and equity investor introductions, for a flat fee with no success fee and no carry. A client closed a Texas services platform this year on institutional senior credit plus structured seller financing, covered by Yahoo Finance and AP News.
Next step: how we fund acquisitions, our services and pricing, the platform comparison hub, or book a strategy call.