What Questions to Ask an Investment Banker Before Hiring: 15 Must-Ask (2026)

The right answer to what questions to ask an investment banker before hiring is fifteen specific, evidence-based questions across five areas: track record, process, fees, network, and regulatory standing. The goal of every question is to force the banker to produce verifiable numbers, named senior coverage, and recent comparable transactions in your industry and size band, not generic pitch-book claims. Owners who run this checklist before signing an engagement letter avoid the two most expensive mistakes in M&A: hiring a generalist who passes the deal to a junior, and signing a tail clause that quietly costs them a success fee on a buyer they sourced themselves.

Context: Why This Question Matters

An M&A engagement letter is one of the most consequential contracts an owner signs in their lifetime. It binds the seller to a single advisor for six to twelve months of exclusivity, a tail period that can stretch to eighteen months past termination, and a success fee that on a $25M transaction runs $750,000 to $1.5M. According to the SRS Acquiom 2025 Deal Terms Study, owners who run a proper vetting process before signing pay roughly the same fee as owners who sign with the first banker who pitched them, but close at meaningfully better multiples because they end up with bankers who actually have buyer relationships in their vertical.

The problem is that most sellers go through this exercise once. They do not know which questions separate a real sell-side advisor from a generalist with a pitch deck. The 15 questions below come from Capstone Partners 2026 selection-criteria research, the AM&AA member directory standard, and the patterns CT Acquisitions sees when sellers come to a second opinion after a stalled process with the wrong banker.

The 15 Questions to Ask, Grouped by Area

Track Record (Questions 1 to 4)

1. How many sell-side mandates have you closed in the past 24 months in my industry and size band? The answer you want is five or more recent comparables. A banker who closed twelve deals across twelve different industries is a generalist; a banker who closed five HVAC deals between $10M and $40M of enterprise value in the past two years is a specialist. Ask for the buyer name, closing month, and approximate transaction size for each. Capstone Partners 2026 advises sellers to discount any reference older than 24 months because buyer behavior, multiples, and process norms shift quickly.

2. What is your close rate post-LOI? Industry average for competent sell-side advisors is 60 to 70 percent of signed letters of intent that reach close. A close rate above 80 percent often signals weak price discovery (the banker is leaving money on the table to guarantee close). A close rate below 50 percent signals weak buyer qualification, poor diligence preparation, or a tendency to chase optionality at the seller’s expense.

3. What is the average premium captured against your initial pre-engagement valuation estimate? A confident specialist will tell you the truth: the final closing price typically lands 15 to 25 percent above the conservative anchor they gave at pitch. If the banker promises 50 percent above their estimate, they are sandbagging the estimate to win the mandate. If they cannot answer at all, they do not track their own performance.

4. Can I see your deal sheet for the last 10 closed sells? A real deal sheet lists buyer, seller, sector, size, and closing date. Many bankers will redact buyer or seller names under NDA, which is fine, but the sector, size band, and date must be specific. Vague deal sheets (“$10M to $100M industrials, 2023 to 2025”) are red flags.

Process (Questions 5 to 7)

5. Describe a recent competitive auction you ran. How many bidders did you bring to indications of interest, and what was the price discovery range from low IOI to top final bid? A well-run lower-middle-market process produces four to eight indications of interest, narrows to three to five management presentations, and ends with two to three final round bids. The spread from low IOI to top final bid is typically 25 to 40 percent of enterprise value, which is where the seller’s premium comes from. A banker who runs single-buyer “negotiated” deals is not actually creating price discovery.

6. How do you manage the virtual data room and buyer Q&A? The answer should include a named diligence platform (Datasite, Intralinks, Firmex are standards), a defined response service level for buyer questions, a tracker for who has reviewed what, and a weekly process call cadence. If the banker says “we figure that out per deal,” the operational backbone of the process is weak.

7. Who specifically (named senior banker) will run my deal day to day? This is the single most important question in the list. Pitch meetings are run by the head of the practice. Actual deal execution is often handed to a vice president or associate with three years of experience and four other live mandates. The senior banker who signed the pitch should be named in the engagement letter as the lead, with a maximum number of concurrent mandates and a guarantee they personally attend all management presentations and final negotiations.

Fees (Questions 8 to 10)

8. What is the fee structure? Retainer plus success, and how is success calculated? Standard structure is a monthly retainer of $15,000 to $50,000 (creditable against success fee), plus a success fee on close. Success fee on lower-middle-market deals typically follows a Lehman-style or modified-Lehman scale: 5 percent of the first $5M, 4 percent of the second $5M, 3 percent of the next $10M, and 1 to 2 percent on amounts above, per AM&AA 2026 standard practice. Make sure “success” is defined as cash and rollover equity actually received at close, not enterprise value including assumed debt or earnouts that may never pay out.

9. What expenses are reimbursable, and are they capped? Travel, legal review of the engagement letter, marketing materials, and data room hosting are typical reimbursables. Capstone Partners 2026 reports the typical cap for a $20M to $50M deal is $25,000 to $50,000. An uncapped expense clause is a red flag.

10. What is the tail period? If you find a buyer post-engagement, how long do I owe a success fee? Standard tail is 12 to 18 months and applies only to buyers introduced by the banker during the engagement (the “tail list”). The tail list should be a defined, written schedule attached to the engagement letter at termination, not an open-ended claim by the banker that any buyer who later closes was “on our radar.” Negotiate the tail down to 12 months and insist on a finite tail list of named parties.

Network (Questions 11 to 12)

11. Who are your top 10 active PE platforms and strategic acquirer relationships in my industry? A real specialist will name them on the spot: which platform is rolling up which vertical, which strategic just raised a fund for tuck-ins, which family office has a thesis in your size band. Then verify. Call two of the platforms after the meeting and ask if the banker has brought them deals in the past year.

12. Have you worked with any of my top competitors? Are there conflicts? An advisor who recently sold your closest competitor knows the playbook to position you against them, but may also be sitting on confidential information that creates a conflict. Ask the banker to disclose any sell-side mandate they closed for a direct competitor in the past 24 months and how they will wall off that information.

Regulatory and Insurance (Questions 13 to 14)

13. Are you Series 79 registered? Are you CM&AA certified? Series 79 (FINRA Investment Banking Representative) is required for bankers who take success fees on securities transactions, which includes most equity sales. CM&AA (Certified Merger & Acquisition Advisor) is the AM&AA professional credential. Either or both is the baseline. A banker who is neither and is taking a success fee on a stock sale may be operating outside their license, which creates enforceability problems for the engagement letter itself.

14. What errors and omissions insurance do you carry? Want $1M minimum, $5M is better. E&O insurance protects the seller if the banker makes a material error in the marketing materials, mishandles confidential information, or breaches the engagement. A banker who cannot answer this question or carries no E&O is a risk you do not need to take.

Engagement Terms (Question 15)

15. What is the term length and exclusivity? What are the termination provisions? Standard sell-side engagement is 6 to 12 months of exclusive representation, with a 12 to 18 month tail and mutual termination rights on material change (death, disability, force majeure, banker’s senior coverage departs the firm). Avoid terms longer than 12 months without a clear off-ramp at 6 months if the banker has not produced indications of interest. The exclusivity must be exclusivity to that firm, not exclusivity to that firm “or its affiliates,” which is a clause that traps you if the banker leaves and joins a competitor.

Red Flags in the Answers

Specific patterns in how a banker answers the 15 questions above signal high risk of a bad outcome. Watch for the following.

• Cannot name the senior banker who will run your deal day to day. If the pitch lead pivots to “our team will be on it,” the deal is heading to a vice president with limited authority.
• Heavy retainer, light success fee. A $50,000-per-month retainer against a 2 percent success fee misaligns incentives. The banker gets paid whether the deal closes or not. Standard alignment puts 70 to 85 percent of total fees in the success component.
• Thin recent deal sheet. Fewer than three closed deals in your size band in the past 24 months means you are paying a specialist fee for generalist execution.
• “We will figure it out as we go” on process design. Sell-side process is a repeatable engineering discipline, not improvisation. Vague answers mean vague execution.
• Generalist without industry track record. A banker who has never sold a business in your vertical does not know which buyers care about which metrics, which deal structures are normal, or where the diligence landmines are.
• Refuses to provide references. Every legitimate sell-side advisor has at least three recent sellers willing to take a 15-minute reference call. Refusal is disqualifying.
• Pressure to sign immediately. “This week only” pricing or “we have a buyer ready right now” pitches are sales tactics, not advice. A real engagement letter is reviewed by your M&A attorney and signed in 7 to 14 days.

References to Request and Sample Questions to Ask Them

Ask the banker for five references: three sellers who closed in the past 18 months in a similar size and industry, and two private equity or strategic buyers who participated in their recent processes. A banker who cannot produce these references is not the right hire regardless of how good the pitch was.

Sample questions for seller references

• Would you hire them again? The single most diagnostic reference question. Hesitation is the answer.
• Did they deliver the premium they promised at pitch? Look for specifics. “They told us $22M and we closed at $24M” is a real answer.
• How responsive were they during diligence challenges? Diligence is where mediocre bankers disappear and good bankers earn the fee.
• Were there surprise re-trades between LOI and close? Some re-trade is normal; multiple price reductions in the final 30 days signals poor IOI qualification.
• How did they handle buyer questions and Q&A flow? Pace and quality of buyer Q&A is a leading indicator of process control.

Sample questions for buyer references

• Were the marketing materials and management presentations accurate? Inflated CIMs damage buyer trust and slow every deal that banker runs after.
• Was the pricing expectation reasonable relative to the financials? Buyers will tell you if the banker was anchoring at fantasy multiples.
• Was the process transparent and well-run? Buyers remember which bankers run clean processes and which create chaos.

What Most Owners Get Wrong

Mistake 1: hiring based on brand instead of senior coverage. A well-known boutique with a famous founder will pitch you with the founder in the room, then assign your deal to a vice president with four other live mandates. The brand is real but the experience you actually get is not. Always name the senior banker in the engagement letter.

Mistake 2: not negotiating the tail. The default tail clause in many engagement letters is 24 months with an open-ended definition of “buyers introduced.” This is negotiable. Standard outcome after pushback: 12 to 18 months, finite list of named buyers, written at termination.

Mistake 3: paying for a buyer the seller already had. If you have an existing serious dialogue with a strategic acquirer before signing the engagement, that buyer should be carved out of the success fee or charged at a meaningfully reduced rate (1 to 2 percent instead of 5). This is standard and bankers will agree if pressed; many will not raise it themselves.

How CT Acquisitions Approaches This

CT Acquisitions is a buyer-paid sell-side advisor. The seller does not pay our success fee, the buyer does, which removes the fee-versus-premium tradeoff from the equation entirely. The 15 questions above still apply to us, and we answer all of them in writing during the first call. Our senior banker who runs the pitch is the same person who runs the deal through close, which is why we cap concurrent mandates at three per senior.

If you are vetting two or three other bankers in parallel, bring the same 15 questions to each call and grade the answers side by side. The grading exercise is more valuable than any one pitch. Owners who do this consistently end up with the right advisor for their specific deal, not the best presenter.

Related Questions

How long should an investment banker engagement letter be?

Standard sell-side engagement runs 6 to 12 months of exclusive representation with a 12 to 18 month tail. Anything longer than 12 months without a 6-month off-ramp is non-standard. Mutual termination rights on material change should be included. A 24-month exclusive term with no off-ramp is a contract designed for the banker, not the seller.

What is a typical sell-side success fee in 2026?

For lower-middle-market deals between $10M and $50M, the modified Lehman scale produces a blended success fee of 3 to 5 percent of cash received at close, plus rollover equity. Larger deals scale down to 1 to 2 percent. Smaller deals (under $10M) often carry minimum fees of $250,000 to $500,000. AM&AA 2026 fee surveys confirm these ranges as standard.

Do I need a Series 79 banker to sell my business?

If the transaction is structured as a stock sale (rather than asset sale), and the banker is being paid a success fee tied to the transaction, FINRA generally requires Series 79 registration. Asset sales fall into a grayer regulatory area but most reputable sell-side advisors carry Series 79 anyway. A banker without Series 79 taking a success fee on a stock sale creates contract enforceability risk.

How do I check a banker’s deal track record independently?

Cross-reference the deal sheet against PitchBook, Capital IQ, Mergermarket, or industry trade publications. For lower-middle-market deals that are not publicly announced, call the named buyer references directly. The AM&AA member directory verifies CM&AA certification status. FINRA BrokerCheck verifies Series 79 registration and any disclosed disciplinary history.

What if the banker will not name the senior coverage in writing?

Walk. Naming the senior banker in the engagement letter is the single highest-value provision a seller can negotiate. A banker who refuses to commit the senior to your deal in writing is reserving the right to hand you to whoever has bandwidth on the day execution starts. That is exactly the outcome the 15-question vetting process is designed to prevent.

What to Do Next

If you are within 6 to 18 months of selling and currently vetting bankers, use the 15 questions as a written scorecard. Score each banker 1 to 5 on each question, weight track record and senior coverage at 2x, and pick the highest total. Then have an M&A attorney review the engagement letter against the negotiated points (tail length, defined tail list, named senior, off-ramp, expense cap, success-fee definition).