What Is a Retainer Fee?
A retainer fee is a fixed monthly payment made to an M&A advisor during the advisory engagement, before any transaction closes. It compensates the advisor for the substantial upfront work involved in preparing a business for sale: building the CIM and teaser, constructing the buyer list, managing outreach, coordinating management presentations, and running the bid process.
Retainers typically run USD 5,000 to USD 25,000 per month for mid-market transactions, depending on the advisor’s seniority and the deal’s complexity. For a detailed breakdown of all M&A advisory fee components — including retainer, success fee, expense reimbursement, and tail provision — see M&A Advisory Fees: What Sellers Actually Pay.
How Retainers Are Structured
The retainer is governed by the engagement letter — the formal agreement between seller and advisor. It typically:
- Commences on signing of the engagement letter and runs monthly throughout the process
- Is credited against the success fee at closing, so the seller does not pay both in full
- Does not refund if no deal closes — the advisor retains retainer payments even if a transaction fails to complete
The credit mechanism is the most important retainer term to negotiate. A USD 10,000 monthly retainer over a nine-month process represents USD 90,000 in total cost. If that amount is credited against a USD 600,000 success fee, the seller pays USD 510,000 at closing — the retainer reduces total cost. If there is no credit, the seller pays both the USD 90,000 in retainers and the full USD 600,000 success fee.
Typical Retainer Ranges by Deal Size
| Deal Size (Enterprise Value) | Typical Monthly Retainer |
|---|---|
| Under $10M | USD 3,000–8,000 |
| $10–25M | USD 5,000–12,000 |
| $25–50M | USD 8,000–18,000 |
| $50–100M | USD 12,000–25,000 |
| $100M+ | USD 20,000–50,000+ |
Source: APAC mid-market advisory practice benchmarks.
Retainer vs. Success-Fee-Only: The Core Comparison
Traditional M&A advisors charge both a retainer and a success fee. Boutique advisors increasingly offer success-fee-only arrangements.
| Model | Retainer | Success Fee | Who Bears Upfront Risk |
|---|---|---|---|
| Traditional (retainer + success fee) | Yes ($5K–$25K/month) | Yes (1–5% EV) | Seller pays monthly regardless of outcome |
| Success-fee-only | No | Yes (1–5% EV) | Advisor bears all upfront resource cost |
The argument for retainers: Long, complex transactions require significant advisor resources over 9–18 months. The retainer provides cash-flow cover and ensures the advisor does not deprioritise a difficult mandate in favour of easier deals.
The argument against: A retainer reduces alignment. An advisor who earns USD 10,000 per month regardless of outcome has a different incentive from one who earns nothing unless a transaction closes. For business owners, the retainer represents real cash cost during an already-stressful process — cost that is at risk if the deal does not close.
“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.”
— Daniel Bae, Founder & CEO, Lyndon Advisory, with over US$30 billion in transaction experience.
Lyndon Advisory charges no retainer — a success fee only, at 2% of enterprise value capped at US$300,000, with no monthly charges and no expense recharges.
What to Negotiate
Every retainer term is negotiable. Business owners should address the following before signing:
- Credit against success fee — insist the retainer is fully credited at closing; resist any partial-credit or no-credit structure
- Retainer amount — compare across two or three advisors; amounts vary significantly and are not standardised
- Start date — negotiate a grace period before the retainer commences if preparation is expected to take several weeks
- Cap on total retainer payments — useful if you are uncertain about timeline; caps protects against a prolonged, expensive process
- Treatment if deal fails — clarify whether partial retainer payments are refundable under any circumstances (they usually are not)
The Tail Provision and Retainer Interaction
A tail provision entitles the advisor to a success fee if the business is sold to a buyer the advisor introduced, within 12–24 months of the engagement ending. During the tail period, there is no retainer — the advisor earns only if a transaction closes with a specific set of identified buyers.
The interaction between retainer and tail matters for deals that do not close. If an engagement runs for 12 months (generating USD 120,000 in retainers) but does not close, and the business then sells under the tail provision 18 months later, the advisor typically earns the full success fee — without crediting the earlier retainer payments, as the credit mechanism applies only to the original engagement.
This can result in the seller paying both the historical retainers and a full success fee. Negotiate the tail provision to define clearly which buyers are covered, and consider whether the retainer credit should carry forward into any tail transaction.
APAC Retainer Conventions
Retainer structures in Asia Pacific broadly track Western conventions, with regional variation:
- Hong Kong and Singapore — Western-style retainer plus success fee is standard for mandates above USD 20 million; success-fee-only is more common for smaller deals
- Japan — retainers tend to be higher and processes longer (12–18 months is typical), reflecting relationship-based deal dynamics; a USD 15,000–30,000 monthly retainer is not unusual for a mid-market Japanese mandate
- Australia — the most transparent and standardised APAC market; fee structures are comparable across boutique advisors, with retainers in the USD 8,000–20,000 range for mid-market deals
- Southeast Asia — Singapore-headquartered advisors use Western structures; local advisors may use simpler flat-fee or reduced-retainer models, particularly for sub-USD 10 million transactions
For full APAC-specific benchmarks by market, deal size, and advisor type, see M&A Advisory Fees: What Sellers Actually Pay.