Hi, I’m Chris Walton, author of this guide and CEO of Eton Venture Services.
I’ve spent much of my career working as a corporate transactional lawyer at Gunderson Dettmer, becoming an expert in tax law & venture financing. Since starting Eton, I’ve completed thousands of business valuations for companies of all sizes.
Read my full bio here.
💡Below is a breakdown of standard M&A fees. To get specific pricing for our M&A advisory, valuations and transaction opinion at Eton, reach out to us directly here.
Your M&A advisory fees are usually made up of four components.
Those are the:
Which ones, and how much you pay for each, will depend on the advisory firm and the results of your M&A deal.
Your firm will let you know ahead of time which fee types they charge but you can expect to pay at least the retainer and one type of success fee.
If you’re trying to benchmark against average M&A fees, the table below gives a practical reference point by deal size.
Deal Size | Basic Retainer Fees | Success Fees | Fixed Success Fees | Flat Percentage Success Fees |
≤1MM | $5,000 – $10,000 per month | 7 – 10% | $50,000 – $75,000 | 5% – 10% of the deal value |
$1-10MM | $10,000 – $20,000 per month | 5 – 8% | $75,000 – $200,000 | 3% – 7% of the deal value |
$10-30MM | $15,000 – $30,000 per month | 3 – 6% | $200,000 – $500,000 | 2% – 5% of the deal value |
$30-50MM | $20,000 – $40,000 per month | 2 – 5% | $500,000 – $750,000 | 1.5% – 4% of the deal value |
$50+MM | $25,000 – $50,000 per month | N/A | $750,000 and up | 1% – 3% of the deal value |
These ranges reflect typical M&A advisor fees across small, mid-market, and large transactions.
📌 Disclaimer: These cost ranges are based on general industry standards and common practices observed in the M&A advisory field. They’re compiled from various industry reports, expert opinions, and standard pricing models that are typically seen across different deal sizes.
Please note that actual costs can vary depending on specific circumstances, such as the advisor’s reputation, the complexity of the deal, geographic location, and industry specifics.
For the most accurate and relevant information, we recommend you consult directly with M&A advisory firms or review the detailed pricing structures listed on their websites.
If the table doesn’t quite make sense to you yet, don’t worry. Below, I go into detail for each fee column.
📚 You might also like: 7 Top M&A Consultants for Hire in 2024
Key Takeaways
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As noted earlier, the typical M&A advisory fee structure includes both upfront and success-based components. Let’s look at each fee type in turn:
This fee is an upfront payment made to the advisory firm to secure their services and cover initial expenses.
It’s typically a fixed amount or a percentage of the total deal value. Paying this fee helps demonstrate your commitment to the process and ensures the advisor’s availability and dedication from the outset.
M&A success fees, sometimes referred to as M&A commission rates, are contingent upon the successful completion of the transaction. They’re typically calculated as a percentage of the deal value or structured as a predetermined amount.
This fee aligns the interests of the advisor with yours, incentivizing them to work diligently to achieve a favorable outcome.
Negotiating the success fee percentage upfront can help clarify expectations and avoid misunderstandings later on.
Some advisory firms may offer a fixed success fee option, where the fee amount is predetermined regardless of the deal size or outcome.
This can provide predictability in terms of costs but may not always align with the level of effort required for more complex or large-scale transactions. Consider discussing with your advisor whether this option suits your specific needs and circumstances.
Alternatively, advisors may charge a flat percentage success fee based on the deal value. This approach can be more flexible than a fixed fee, adjusting proportionally with the transaction size.
However, it’s important to clarify whether there are any caps or minimum thresholds associated with this fee structure to avoid surprises during the negotiation process.
M&A transaction costs don’t stop at the fees listed above. In fact, there are several other fees you need to consider and budget for depending on your deal.
For example, the larger your deal size, the more people you’ll need to hire to support the process and thus the more you’ll need to pay overall.
Here are some other common factors influencing the price of your M&A advisory:
As I hinted at before, no two M&A advisor fees are the same. Even the standard fee a firm charges you will vary depending on these four factors:
Let me explain.
It seems counterintuitive but the larger your deal size, the lower your advisory fee will be (barring the influence of the other factors). This is often because the firm will rely on the success fee being larger and thus compensating them well for their time.
Because a small deal size won’t bring as much money in success fees, the firm will offset this by charging a higher advisory fee.
So it’s important to take this into consideration. It doesn’t mean a business with a small deal will pay more overall, it simply means the costs will be distributed to different components.
Geographic location can impact advisory fees due to differences in market competitiveness and regulatory requirements.
As a general rule, urban areas with a high concentration of M&A activity will command higher fees compared to rural regions. So a firm based in New York City will likely charge more than one in the middle of nowhere Delaware.
The more complex your M&A, the more it will cost you. This is because it takes more time, resources, and expertise to advise complex situations.
Some examples of complex transitions include:
Small businesses typically involve lower fees due to simpler organizational structures and financial complexities.
Large corporations, on the other hand, with extensive operations and intricate financial arrangements may have higher fees to accommodate the additional diligence and analysis required.
If a deal looks uncertain, advisory pricing usually adjusts.
For example, if a buyer hasn’t secured financing, if there are very few credible bidders, or if one side appears indecisive, the risk of the deal falling apart increases.
To account for that risk, advisors may charge a higher retainer, require a minimum success fee, or structure part of the fee to be paid regardless of closing.
A competitive auction with multiple bidders requires more coordination, more buyer outreach, and tighter management of deadlines. Meanwhile, a one-on-one negotiated deal is generally more straightforward and may involve fewer advisory hours.
More process intensity usually means higher fees.
If your deal includes earnouts, stock consideration, seller financing, or deferred payments, defining the purchase price — and when fees are triggered — becomes more complex.
Advisors will often clarify this upfront in the engagement letter, and in some cases may include additional provisions for contingent payments.
Well-prepared companies reduce advisory workload. Clean financials, organized documentation, and responsive management teams keep the process efficient.
If advisors need to spend extra time cleaning up reporting, rebuilding financials, or chasing information, that additional work can increase overall costs.
If you need a transaction completed quickly, expect fees to reflect that.
Accelerated timelines require more senior involvement and longer working hours to meet tight deadlines. That intensity is typically factored into pricing.
When financing is tight, valuations are volatile, or buyers are cautious, more deals fall apart.
Under those conditions, advisors may rely more heavily on retainers or minimum success fees to manage uncertainty.
Large global investment banks often charge higher fees due to brand recognition and the depth of their teams. Boutique firms may offer more flexible pricing structures while still providing senior-level attention.
When multiple advisory firms compete for a mandate, fee structures can become more flexible.
Some firms may adjust retainers, cap expenses, or modify success fee mechanics to win the engagement.
Advisory fee structures are rarely set in stone. Most firms have room to negotiate, especially if you come prepared.
Here are four ways to improve your terms before signing an engagement letter:
This is where disputes start. If your deal includes earnouts, seller notes, rolled equity, or stock consideration, get the advisor to spell out exactly what’s included in the success fee calculation and when that fee is triggered.
Some fees are due at signing, others at closing, and some only after funds transfer. Nail this down upfront.
If you’re paying a retainer, push to have it deducted from the success fee at closing. You avoid paying twice for overlapping work, and it keeps the advisor’s incentives tied to your outcome rather than just the process.
Note that some advisors, particularly larger firms, won’t budge on this, but it’s always worth asking early in the negotiation.
Travel, meals, lodging, and third-party consultants can accumulate quietly. Request a hard cap on reimbursables, or require written approval for anything above a set threshold. This simple ask can prevent surprise line items.
In deals with deferred or contingent payments, clarify whether fees are triggered on total announced value or only on cash received at close. Many advisors default to fees on announced value and may resist changes to this, so raise it early and expect to negotiate.
The distinction matters, and reasonable adjustments are sometimes possible when addressed before the engagement letter is signed.
Two shifts are worth being aware of as you evaluate advisors and negotiate terms:
Acquirers are increasingly automating parts of the M&A process (diligence, benchmarking, integration planning) and that’s reshaping what they’re willing to pay for.
According to Bain & Company’s 2025 M&A Report, 21% of M&A practitioners currently use generative AI, rising to 36% among the most active acquirers.
As buyers take on more of the analytical workload, they’re also pushing for leaner, more outcome-focused fee structures from advisors.
The regulatory environment has shifted but hasn’t simplified. Some deals are moving faster than they were a few years ago, but others, particularly large, cross-border, or tech-related transactions, still face meaningful delays and scrutiny.
Advisors are responding by building more protection into their fee structures. Announcement fees, charged even if a deal doesn’t close, are becoming more common, as is breakup-fee sharing on buy-side mandates.
If you’re pursuing a complex deal, expect advisors to raise these provisions during negotiations and factor them into your total cost of advice.
At Eton, we’re customer obsessed. We know that an M&A outcome isn’t about us, it’s about you, your company, and your people. Every M&A advisory client gets our full attention and expertise—expertise that comes from working at Big 4 firms.
We can also handle other parts of the M&A process such as valuation of your business or intellectual property. This streamlines the work and minimizes unnecessary back and forth between firms.
Our services are bespoke to your needs and I’m always on hand to answer questions and clear concerns at no additional cost to you.
If you want to learn how we can support your M&A with transparency, expertise, and care, get in touch with me here.
M&A fees are payments made to advisors for their services in managing and facilitating mergers and acquisitions.
These fees vary widely depending on the complexity of the transaction, the customization required, and the specific terms negotiated.
They are often not disclosed upfront due to competitive, confidential, and industry norm reasons, and can include a mix of fixed fees, percentage of the transaction value, or other flexible arrangements.
The average M&A advisory fee percentage typically falls between 1% and 5% of the transaction value.
The exact percentage depends on deal size and complexity. Smaller transactions often carry higher percentages to compensate advisors for their effort, while larger deals, especially those over $100M or in the billion-dollar range, tend to have lower percentages but much higher absolute dollar amounts.
Yes, sell-side and buy-side M&A advisory fees are often structured differently, though both typically combine a retainer with a success fee tied to the transaction value.
In both cases, the final fee structure depends on deal size, complexity, and the level of strategic involvement required.
A typical M&A advisory process usually takes between 6 months to a year, depending on the complexity of the deal, the readiness of the involved parties, and regulatory requirements.
Some transactions may be completed more quickly if the parties are well-prepared and there are few regulatory hurdles, while others might take longer due to negotiations, due diligence, and integration planning.
The success rate for mergers and acquisitions varies widely, but according to Harvard Business Review, around 50% to 70% of M&A deals fail to achieve their intended goals.
The success depends on various factors, including strategic alignment, cultural integration, and effective post-merger integration.
Successful deals are those that enhance value, achieve synergies, and meet strategic objectives.
Schedule a free consultation meeting to discuss your valuation needs.
Chris Walton, JD, is President and CEO and co-founded Eton Venture Services in 2010 to provide mission-critical valuations to private companies. He leads a team that collaborates closely with each client’s leadership, board of directors, internal / external counsel, and independent auditors to develop detailed financial models and create accurate, audit-ready valuations.
