Key takeaways
- The engagement letter defines your fee obligation, exclusivity period, and tail period — all three are negotiable before you sign
- Success fees on middle market transactions typically range from 1.5% to 3.5% of enterprise value using modified Lehman formulas
- The first 6–8 weeks of an engagement are almost entirely internal prep: CIM drafting, data room build, and management presentation coaching
- What the banker needs from you — clean financials, management availability, and fast document response — is the single biggest process variable you control
- Tail provisions mean fee obligations can survive 12–24 months after you terminate an engagement
In this article
What Most Founders Get Wrong When Hiring a Banker
Most founders hire an investment banker once. The relationship has a specific lifecycle, a defined set of deliverables, a fee structure that is partly negotiable, and a set of obligations that fall squarely on the founder — obligations that determine how fast the process moves and how well buyers perceive the business. Understanding what you are signing before you sign it, and what the next six to nine months will look like, is the foundation of a productive banker relationship.
The common misconception is that hiring a banker transfers the work of selling. It does not. A banker brings buyer relationships, process design expertise, document production capacity, and negotiating leverage. The business still has to perform during the process, management has to be available and responsive, and the financial narrative has to hold up under scrutiny. Founders who understand this going in are better positioned to use the relationship effectively.
The Engagement Letter: What You Are Signing
The engagement letter is a binding contract that defines your relationship with the banker for the duration of the process and potentially beyond it. Most founders review it quickly and sign. The five provisions that matter most are the fee structure, the exclusivity clause, the tail period, the expense reimbursement terms, and the termination rights.
Engagement Letter Provisions That Are Negotiable
Success fee percentage and formula: Negotiable — particularly the base rate and incentive tier thresholds
Retainer amount: Negotiable — ranges from $10K–$50K per month depending on firm and deal size
Retainer creditability against success fee: Push for full credit of retainer payments toward the close fee
Tail period length: 12 months is standard in first drafts but 6–9 months is achievable with leverage
Tail trigger definition: Negotiate "introduced" to mean direct conversation — not just teaser distribution
Expense cap: Set a hard cap on out-of-pocket travel and document reproduction expenses
The tail provision deserves specific attention. A tail means that if you terminate the engagement and then close a transaction within the tail period with any buyer the banker introduced, you owe the full success fee. Tail periods of 18–24 months are common in first drafts. If the process fails or you lose confidence in the banker, you cannot simply walk away and hire someone else without potentially owing two success fees. Negotiate the tail period down and define "introduced" narrowly.
The most overlooked risk in engagement letters is broad tail language. If the banker sends a teaser to 40 potential buyers, every one of those buyers may be covered for 18 months. Require that a qualifying introduction involve a direct conversation — not just receiving a teaser — before triggering the tail obligation.
How Banker Fees Are Structured
Banker compensation in the middle market combines a monthly retainer during the engagement and a success fee paid at close. The success fee is calculated as a percentage of enterprise value, and most middle market bankers use some variation of the Lehman formula or the double Lehman formula with a minimum floor.
Fee Structure
For a $20M enterprise value transaction, total banker compensation including retainer (often credited at close) and success fee typically lands between $400K and $700K. These are large numbers, but the spread improvement from running a competitive process — which a banker is positioned to create — typically exceeds the fee. DIY seller data consistently shows represented sellers achieve better outcomes. The fee is not the cost of the process; it is the cost of competitive tension.
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Schedule a conversation →The First Eight Weeks: Internal Preparation
The period between signing the engagement letter and the first buyer conversation is almost entirely internal preparation. This phase sets the quality ceiling for the entire process. The CIM, the data room quality, and management presentation readiness all get determined here.
The banker needs historical financial statements (typically three years of P&Ls, balance sheets, and cash flow statements), a current management account package, customer revenue by year, headcount data, key contracts, and any existing financial models. In most middle market engagements, getting these materials from the founder is the single biggest source of delay. Founders who have invested in management reporting quality before engaging a banker move through this phase in four to five weeks. Founders who have not spend eight to ten weeks on cleanup.
The CIM is the primary marketing document. It runs 40–80 pages and covers the investment thesis, business overview, financial history, growth opportunities, and management team. The banker writes it, but the founder reviews and approves it. Pushing back on language that overpromises or undersells the business at this stage matters — buyers will test everything the CIM claims during diligence.
CIM Development Process
Management Presentations and the Marketing Phase
Once the CIM is approved, the banker distributes a one-page teaser (no company name) to the targeted buyer list. Buyers who express interest sign an NDA and receive the full CIM. The banker then manages a structured process — an IOI deadline, a management presentation phase, and an LOI deadline. This controlled sequence is how competitive tension gets created. Buyers know they are competing and that the timeline is fixed.
Management presentations run 90–120 minutes, in person or by video. The banker prepares a structured slide deck and runs rehearsals. Expect four to eight presentations with qualified buyers. The questions are predictable: why are you selling now, how does the business sustain growth without you, what does the management team look like, where are the risks. Preparing honest, confident answers to these questions — especially the owner dependency question — is where most management presentation coaching time should go.
Your job during the marketing phase is to be responsive, available for presentations, and consistent in messaging. Inconsistencies between what management says and what the CIM says are one of the most common sources of buyer skepticism. Bankers who have run many processes will brief you on this. Founders who go off-script create buyer uncertainty that shows up in LOI pricing.
What the Banker Cannot Do For You
Bankers create process and competitive tension. They do not create a better business. If the company has three customers representing 70% of revenue, a management team that depends entirely on the founder, or financial statements that do not match the narrative — no process design fixes that. Bankers can frame a business, but they cannot reframe one that buyers will see through in diligence.
The founder is also the primary point of contact for management presentations, team retention during the process, and the ongoing operation of the business while the process is running. Processes that drag past nine months create fatigue, increase the risk of key employee departures, and give buyers time to find more problems. Moving fast in every phase you control — document delivery, management availability, decision-making — is one of the most practical things a founder can do to protect the outcome.
Common Questions About Investment Banker Engagements
Frequently asked questions
How long does a typical middle market M&A process take from engagement to close?
Most middle market processes run six to nine months from engagement signing to close. The internal prep phase takes six to eight weeks. Marketing and management presentations take six to ten weeks. Diligence and purchase agreement negotiation after LOI selection takes eight to fourteen weeks. Deals with complex structure, regulatory requirements, or buyer financing contingencies can extend past twelve months. Deals where the seller has pre-prepared materials and a responsive management team close faster.
How do I know if the success fee is reasonable?
The standard test is whether the effective fee rate falls between 1.5% and 3.5% of enterprise value. Smaller deals (sub-$15M EV) carry higher effective rates because the absolute fee needs to justify the time. Larger deals (above $75M EV) carry lower effective rates. The more important question is whether the fee is success-only or requires a retainer that does not credit at close. Push for full credit of retainer payments against the success fee.
What happens if the process fails and no deal closes?
If no deal closes, you owe no success fee but you do owe any retainer paid and any reimbursable expenses. Review the tail provision carefully before restarting with a new banker — if the first banker introduced buyers during the engagement, a successful deal with one of those buyers within the tail period triggers the full fee even if the formal process has ended.
Can I talk to buyers directly without the banker?
Typically no — the engagement letter requires all buyer communications to go through the banker. This protects you as well, since uncoordinated founder conversations with buyers create inconsistent information and can inadvertently collapse competitive tension. The exception is buyers you had a pre-existing relationship with before the engagement, which some engagement letters carve out explicitly.
Disclaimer: Financial figures and case studies in this article are illustrative, based on representative middle market assumptions, and are not guarantees of outcome. Statistical references are drawn from cited third-party research; individual transaction and operational results vary based on business characteristics, market conditions, and deal structure. This content is for informational purposes only and does not constitute legal, financial, or investment advice. Consult qualified advisors for guidance specific to your situation.
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