M&A Advisor Fees by Deal Size: What Founders Pay in 2026
What M&A advisors actually charge on software deals from $3M to $50M: retainer ranges, success-fee percentages by deal size, and what the retainer buys.
A transparent breakdown of investment banking and advisory fees for software company transactions from $3M to $50M+
M&A advisors rarely publish their fee structures—and for good reason. Fees depend heavily on deal size, complexity, and the likelihood of closing. But as a founder preparing for an exit, you deserve clarity on what to expect.
The ranges on this page reflect what we observe across the 150+ software transactions iMerge has advised. Last reviewed November 2026.
Typical Success Fees by Deal Size
Success fees are paid at closing as a percentage of total transaction value.
| Deal Size | Expected Success Fee | Typical Advisor Type |
|---|---|---|
| $1M – $5M | 8% – 12% | Business Broker |
| $5M – $25M | 4% – 7% | M&A Advisor |
| $25M – $100M | 2% – 4% | M&A Advisor / Investment Bank |
| $100M+ | 1% – 2% | Investment Bank |
Retainer Fees
Most M&A advisors charge an upfront retainer, credited against the success fee at close—typically $50,000 to $250,000, sometimes structured as monthly payments over 4–12 months.
The retainer serves two purposes:
- Covers upfront costs (valuation analysis, marketing materials, buyer research)
- Signals your commitment—advisors are wary of "tire kickers"
Why Higher % for Smaller Deals?
The work required to close a $10M deal is nearly identical to a $50M deal—same buyer outreach, same due diligence, same negotiation complexity.
The percentage compensates for the absolute dollars at stake. A 5% fee on a $10M deal ($500K) represents the same effort as a 1.5% fee on a $50M deal ($750K).
How the Lehman and Double Lehman Formulas Work
Some advisors quote a formula instead of a flat percentage. The original Lehman formula steps down through the first $5M of transaction value: 5% of the first million, 4% of the second, 3% of the third, 2% of the fourth, 1% of the fifth, and 1% of everything above. On a $10M deal that totals $200,000, or 2.0%.
The Double Lehman doubles each step—10%, 8%, 6%, 4%, 2%, then 2% above $5M. On the same $10M deal that totals $400,000, or 4.0%, which lands at the bottom of the range in the table above.
Formulas are most common in the lower middle market, where a flat percentage on a smaller deal would not cover the work. Ask which variant is being quoted; the difference on a $10M transaction is $200,000.
Tiered and Ratchet Success Fees
Rather than one percentage across the whole deal, some engagements step the fee up above a threshold: a base rate to an agreed number, then a higher rate on everything beyond it. An engagement might pay 4% up to $12M and 8% on value above that.
Structured well, this aligns the advisor with the outcome you actually care about. If you believe your company is worth more than the market's opening number, a ratchet is usually worth more to you than a lower flat fee.
Read the threshold closely. A ratchet set above a number nobody realistically expects to reach is decoration, not alignment.
What the Retainer-to-Fee Ratio Tells You
- High retainer, low success fee: The advisor may doubt the deal will close or expects a long timeline
- Low retainer, high success fee: The advisor is confident in your deal's attractiveness and closing probability
- No retainer: Proceed with caution—either your valuation expectations are too low, or the firm isn't selective
Broker vs. M&A Advisor vs. Investment Bank
| Provider | Typical Deal Size | Fee Structure |
|---|---|---|
| Business Broker | Under $5M | 10% – 12% commission |
| M&A Advisor | $3M – $100M | Retainer + 2% – 7% success fee |
| Investment Bank | $50M+ | Retainer + 1% – 2% success fee |
For software and SaaS companies in the $3M – $50M range, a specialized M&A advisor typically offers the best fit. Full comparison: M&A advisor vs. business broker vs. investment bank.
What You Pay If the Deal Doesn't Close
Not every process ends in a sale, and the fee structure decides what that costs you.
The success fee is contingent: no closing, no fee. That is the whole point of the structure, and it is why advisors are selective about which engagements they take.
The retainer is generally not refundable. It paid for work that was genuinely performed—valuation analysis, materials, buyer research—whether or not a buyer signs.
Third-party costs are incurred as you go. Legal fees accrue against work done, and a quality of earnings report is paid for whether or not it is ever handed to a buyer.
The tail provision outlives the engagement. If you close later with a buyer the advisor introduced, the success fee is still owed. Confirm the tail covers only buyers the advisor actually contacted, and ask for the contact list in writing when the engagement ends.
Other Costs to Budget For
Legal Fees
Expect $50,000 – $150,000+ for M&A legal work, including purchase agreement negotiation, disclosure schedules, and closing documents.
Quality of Earnings Report
A QoE report typically costs $30,000 – $80,000. Buyers often require one, and having your own "sell-side QoE" can accelerate due diligence.
Tax Advisory
Structuring your deal for optimal tax treatment can save hundreds of thousands of dollars. Budget $10,000 – $50,000 for specialized M&A tax advice.
What a $10M Software Exit Costs All In
Applying the ranges above to a single transaction, using the full advisor fee band for a $5M–$25M deal:
| Cost | Low | High |
|---|---|---|
| Advisory success fee (4% – 7%) | $400,000 | $700,000 |
| Retainer ($50,000 – $250,000, credited against the success fee) | — | — |
| Legal | $50,000 | $150,000 |
| Quality of earnings | $30,000 | $80,000 |
| Tax advisory | $10,000 | $50,000 |
| Total | $490,000 | $980,000 |
That is 4.9% to 9.8% of transaction value. The spread is wide because it is driven by choices rather than by market rates: a clean data room shortens legal hours, a sell-side quality of earnings report costs money up front but reduces retrade risk, and a competitive process changes the headline number far more than any line in this table.
A minority of advisors charge the retainer on top of the success fee rather than crediting it. If yours does, add the $50,000 – $250,000 back to the table above. Confirm which applies before you sign.
Frequently Asked Questions
Common questions founders ask about M&A advisory fees.
Why won't M&A advisors give me a straight fee quote upfront?
Fees depend on factors that require discovery: your company's complexity, growth trajectory, buyer universe, and realistic valuation range. A responsible advisor needs to understand your situation before quoting—beware of anyone who quotes a fee in the first call.
Should I choose the advisor with the lowest fee?
Rarely. The difference between an experienced advisor and a cheap one often shows up in the final transaction value. A good advisor might cost 1% more but deliver a 15–20% higher valuation through competitive tension, better buyer targeting, and skilled negotiation.
What's a "tail" provision?
The tail protects the advisor if you close a deal with a buyer they introduced, even after your engagement ends. Typical tails run 12–24 months. This is standard and reasonable—just ensure the tail only applies to buyers the advisor actually contacted.
Are fees negotiable?
Somewhat. Retainer structure and success fee tiers are often negotiable, especially for attractive deals. But dramatically undercutting fees may signal that the advisor is desperate or doesn't value their own work—neither is a good sign.
Considering an Exit?
We work with software and SaaS founders on transactions from $3M to $50M. No pressure, no obligation—just a straightforward conversation about your options.
This is part of our coverage on the Synoptic M&A™ process.
Michael Gravel has led 150+ software, SaaS, and AI company exits over 26 years as Managing Partner of iMerge Advisors. He specializes in sell-side advisory for founder-led and bootstrapped SaaS and AI companies in the $3M–$50M ARR range, with particular focus on AI valuation positioning, recapitalizations, and competitive auction processes that maximize founder outcomes. Full bio →
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