What Is a Success Fee?
A success fee is an M&A advisory fee paid only when a transaction closes successfully. It is the primary compensation mechanism for sell-side M&A advisors, calculated as a percentage of the enterprise value (or occasionally equity value) agreed at closing.
The success fee is distinct from a monthly retainer — which is charged regardless of outcome — and from expense reimbursement, which covers out-of-pocket deal costs. While most traditional advisory firms charge both a retainer and a success fee, a success-fee-only model is increasingly common among boutique advisors, where the advisor earns nothing unless a deal closes at an agreed price.
Understanding success fee structures is essential before signing an engagement letter. For a full breakdown of all advisory fee components, benchmarks, and how to negotiate them, see M&A Advisory Fees: What Sellers Actually Pay.
Lyndon Advisory charges a success fee only — 2% of enterprise value, capped at US$300,000 — with no retainer, no monthly fees, and no expense recharges.
How Success Fees Are Calculated
Success fees are expressed as a percentage of deal size, applied to enterprise value at closing. The percentage declines as deal size increases, reflecting the greater complexity of larger transactions without a proportional increase in advisory workload.
| Deal Size (Enterprise Value) | Typical Success Fee Range |
|---|---|
| Under $10M | 4–6% |
| $10–25M | 3–5% |
| $25–50M | 2–4% |
| $50–100M | 1.5–3% |
| $100M+ | 1–2% |
Source: APAC mid-market advisory practice benchmarks.
Fee Basis: Enterprise Value vs. Equity Value
Whether the success fee applies to enterprise value or equity value can be a material difference for businesses with significant debt. A company with $50 million in enterprise value and $10 million in debt has an equity value of $40 million. A 3% success fee on enterprise value is $1.5 million; on equity value it is $1.2 million — a $300,000 difference on a single transaction.
Always confirm the fee basis in the engagement letter before signing.
Success Fee vs. Retainer: The Core Comparison
| Model | Retainer | Success Fee | Who Bears Risk |
|---|---|---|---|
| Traditional (retainer + success fee) | Yes ($5K–$25K/month) | Yes (1–5% EV) | Seller bears upfront cost; advisor has lower financial risk |
| Success-fee-only | No | Yes (1–5% EV) | Advisor bears all upfront resource cost |
A retainer is sometimes argued as compensation for sustained resource investment on complex, long-running mandates. However, for most business owners, a success-fee-only model is preferable — the advisor’s financial incentive is entirely aligned with completing a deal at the best price.
“The test for any advisory fee structure is alignment. An advisor who earns a monthly retainer regardless of outcome has a different incentive from one who earns nothing unless a transaction closes. At Lyndon Advisory, we only get paid when you do.”
— Daniel Bae, Founder & CEO, Lyndon Advisory, who has advised on over US$30 billion in transactions globally.
The Lehman Formula: A Common Framework
The Lehman formula is the most widely used framework for calculating success fees in investment banking. The original structure:
- 5% of the first million
- 4% of the second million
- 3% of the third million
- 2% of the fourth million
- 1% of everything above $4 million
For modern mid-market transactions, the Modified Lehman (scaled to tens of millions) is more common:
- 5% of the first $10 million of enterprise value
- 4% of the second $10 million
- 3% of the third $10 million
- 2% of the fourth $10 million
- 1% of the remainder
The Lehman formula and its variants are detailed in the full Lehman formula glossary entry.
Negotiating the Success Fee
Every component of the success fee arrangement is negotiable. Business owners who approach fee negotiations strategically can significantly reduce their total advisory cost.
What to negotiate:
- Percentage and basis — Push for the lowest percentage and confirm whether it applies to enterprise value or equity value
- Minimum fee — The floor below which the fee cannot fall; important if a deal closes at a lower-than-expected price
- Retainer credit — If there is a retainer, insist it is fully credited against the success fee at closing
- Tail provision scope — Negotiate the narrowest possible definition of which buyers are covered and the shortest reasonable duration (12 months is preferable to 24)
- Trigger events — Confirm exactly which transaction types trigger the fee: asset sale, share sale, merger, recapitalisation, or all of the above
Sellers who obtain fee proposals from two or three advisors gain meaningful negotiating leverage on all of these terms.
The Engagement Letter and Success Fee Triggers
The success fee is governed by the engagement letter — the formal agreement between seller and advisor. Before signing, independent legal counsel should review the trigger events (which transaction types activate the fee), the tail provision scope, the fee basis, and any minimum fee provisions.
The difference between a well-negotiated and poorly-negotiated engagement letter can run to hundreds of thousands of dollars on a single transaction. Do not sign an engagement letter without understanding every fee component.
APAC Success Fee Benchmarks
Success fee structures in Asia Pacific broadly track Western conventions, with market-specific variations:
- Hong Kong and Singapore — retainer plus success fee is standard for larger mandates; success-fee-only increasingly common for sub-$50M deals
- Japan — higher retainers reflect longer advisory periods (12–18 months) typical in relationship-driven Japanese M&A processes
- Australia — the most standardised APAC market; fee structures are transparent and comparable across most advisory firms
- Southeast Asia — Singapore-headquartered advisors use Western structures; local advisors in Indonesia, Vietnam, and Thailand may use simpler flat-fee models
For APAC-specific benchmarks by market and deal size, see M&A Advisory Fees: What Sellers Actually Pay.