M&A Advisor Retainer vs Success Fee

An M&A advisor retainer is paid before closing, while a success fee is paid when the transaction completes. For owners selling a business, the difference matters because retainers shift process cost to the seller before buyer value is proven. Lyndon Advisory charges a success fee only: 2% of enterprise value, capped at US$300,000, with no retainer, monthly fee, upfront fee, or expense recharge.

Retainers are not always wrong, but sellers should understand the economics before signing.

Retainer vs Success Fee

Feature	Retainer	Success fee
Timing	Paid before or during process	Paid at closing
Seller risk	Pay even if no deal closes	Pay only if value is realized
Advisor alignment	Can reduce closing pressure	More tied to completion
Key protection	Cap and credit against success fee	Clear trigger and fee cap
Main danger	Open-ended monthly cost	Uncapped percentage or broad tail

Axial’s 2025-2026 M&A Fee Guide shows that retainers, engagement fees, minimum fees, expense policies, and success fees can vary widely. Sellers should ask how every dollar is treated if no transaction closes.

When a Retainer Is More Defensible

Retainer feature	Better version
Purpose	Funds named preparation work
Duration	Fixed period, not open-ended
Credit	Fully credited against success fee
Expenses	No recharge or written cap
Deliverables	Teaser, CIM, financial model, buyer map, data-room plan
Termination	Clear rights and narrow tail

If a retainer funds only availability or generic listing work, the seller should be cautious. If it funds real preparation and is credited against the success fee, the economics may be more reasonable.

Corporate Finance Institute’s CIM overview describes the CIM as a core sell-side marketing document. If an advisor asks for pre-closing fees, sellers should confirm those fees are tied to concrete materials and process work.

“The cleanest seller alignment is success-fee-only at closing. If a retainer exists, it should be capped, credited, and tied to real work that improves buyer readiness.”

— Daniel Bae, Founder & CEO, Lyndon Advisory

Lyndon Approach

Item	Lyndon structure
Retainer	None
Monthly fee	None
Upfront fee	None
Expense recharge	None
Success fee	2% of enterprise value
Fee cap	US$300,000
Payment trigger	Closing only

For related pages, read No-Upfront-Fee M&A Advisor, Success-Fee-Only M&A Advisor, and Transparent M&A Advisor Fees.

Practical Next Step

Situation	Best next step
You have a retainer proposal	Compare M&A advisor fee proposals
You want to model retainer drag	Use the fee calculator
You want a closing-only model	Review Lyndon fees