The client letter is usually the last document anyone drafts and the first thing clients ever see of your sale. That ordering is wrong in one direction only: the drafting should start earlier, but the sending should stay exactly where it is, after the deal is certain. Most of the damage owners do to their own transactions comes from getting that second part wrong, telling clients about a sale that then changes shape or falls over.
This article covers when clients must be told, what data protection and consent actually require in a transfer, how ongoing service agreements move across through novation, what the FCA expects of the communication itself, and what a good letter does. It sits alongside telling your staff, which has its own timing logic, and the rest of the people and clients pillar.
When clients must be told, and when they merely should be
Start by separating two questions that owners tend to blur: when are you legally or regulatorily required to tell clients, and when is it commercially sensible to tell them. The answers are different, and the gap between them is where your discretion lives.
The requirement side turns on what is actually happening to the client. If their adviser, the firm holding their agreement, or the arrangements around their money are changing, they need to know before the change takes effect, in time to object or make other arrangements. In a share sale where the authorised firm continues unchanged, the same company still holds the client agreements, and the immediate regulatory need to notify can be modest; the ownership above the firm has changed, not the client's contractual counterparty. In an asset sale or a client bank sale, the client's agreement is moving to a different legal entity, and that cannot happen properly without the client being informed and, for ongoing service agreements, without their agreement to the transfer. If you have not yet read asset sale or share sale, the distinction matters more here than almost anywhere else in the process.
The commercial side is simpler to state: clients should hear about the sale from you, in your words, before they hear about it from anyone else. Once completion has happened, the news will travel. Staff talk, buyers announce, paperwork arrives with a new letterhead. A client who learns of the sale from a platform statement or a rumour has been told, in effect, that they were not important enough to tell. The window between exchange or completion and the client letter should be measured in days, not weeks.
Consent and data protection in a transfer
The data protection position is less frightening than owners expect, but it is not nothing. Client files are personal data, often including special category data such as health information gathered for protection advice. UK GDPR governs both the due diligence stage, when a prospective buyer wants to see the client bank, and the transfer itself.
During due diligence, the working answer is minimisation and control. A buyer assessing your client bank does not need names, addresses and national insurance numbers to value it; anonymised or pseudonymised data, aggregate breakdowns of FUM, recurring income, client ages and product types, will carry the valuation work. Identifiable data comes later, under a non-disclosure agreement, shared only to the extent the transaction genuinely requires. Sharing the full client file with a party who might still walk away is a data protection failure and a commercial one at the same time.
At transfer, the lawful basis for moving client records to the buyer is usually legitimate interests or the performance of the client's contract, not consent in the UK GDPR sense. That surprises people, because consent does appear in the process, just in a different place. Data protection consent and contractual consent are separate things. The client's records can generally move with the business under a properly documented lawful basis, with the client informed of the change of data controller. What the client must actively agree to is the contractual question: whether their ongoing service agreement, and the adviser charge that funds it, moves to the new firm.
Novation: how the ongoing agreements actually move
In an asset sale, the recurring income the buyer is paying for exists as a set of individual client agreements, each one a contract between the client and your firm. Those contracts do not transfer automatically. They move by novation: the client, your firm and the buyer agree that the buyer replaces your firm as the party to the agreement, or the client signs a fresh agreement with the buyer that supersedes the old one.
This is the point where the client letter stops being a courtesy and becomes the mechanism of the deal. The novation exercise is usually run as a communication programme: a joint letter from seller and buyer explaining the change, a clear statement of what the client needs to do, and a defined treatment of non-responders. Some structures use positive consent, where the client must sign or confirm before their agreement moves. Others use a negative consent or objection process, where the client is told the transfer will happen on a stated date unless they object. Which approach is available depends on the terms of the existing client agreements, the product wrappers involved and the buyer's compliance position, and it is settled in the sale agreement, not improvised afterwards.
Sellers should care about novation mechanics for a hard financial reason: in most asset sales the consideration, and in nearly all of them any earn-out or deferred element, is calculated on the income that actually transfers. Every client who does not novate is money off your price. The quality of the client communication is therefore not a soft issue. It is a direct input to your proceeds, which is one reason why deals collapse so often traces back to client attrition assumptions that the letter, and the handover behind it, failed to support.
What the FCA expects
The FCA has set out its position on client bank sales directly, in its published expectations of firms selling client banks, first published in December 2023 and updated in January 2025. The points that touch client communication are worth taking in their own terms. The client bank is the firm's asset, and the regulator will act where client banks are sold with redress liabilities left behind; firms must hold adequate financial resources for potential redress; and a sale that could affect the firm's risk profile, value or resources needs a SUP 15 notification to the regulator. The FCA also recognises that there are entirely legitimate reasons to sell, retirement and merger among them. Selling is not the problem; selling badly, with clients and liabilities treated as someone else's problem, is.
The thread running through that guidance is consumer outcome, and Consumer Duty gives it teeth on the communication itself. Clients must be able to understand what is changing, what it costs them, and what their options are. A letter that buries the change of firm in paragraph six, or that presents the transfer as a done thing with no route to object where an objection route exists, sits poorly against a duty to support client understanding and avoid foreseeable harm.
The FCA's multi-firm review of consolidation in the advice and wealth management sector, published on Fri 31st Oct 2025, reinforces the same theme from the buyer's side: consolidation can support efficiency and sustainable growth, but poorly managed integration risks poor consumer outcomes. The client communication is the front edge of integration. A seller who insists on a proper communication plan is not being precious; they are aligned with the regulator's stated concern.
What good wording does
A good client letter is short, and it answers the three questions every client actually has before they think to ask them.
First, continuity. What stays the same: the ongoing service, the review cycle, the phone number that gets answered. If the service proposition is changing, say so plainly and say when, because the client will find out anyway and the letter is your one chance to frame it honestly.
Second, their adviser relationship. Named human beings matter more to clients than corporate structures. If their adviser is staying through a handover period, say so and say for how long in general terms. If their adviser is retiring, introduce the person taking over by name and background, and explain how the handover will work. The single strongest predictor of client retention through a sale is whether the client feels they were handed to a person or dropped into a pool.
Third, their money. Clients need to hear, explicitly, that the sale of the firm is not a movement of their investments. Their pensions and ISAs sit with platforms and providers, not in the firm's bank account, and the change of firm does not move them. This sentence feels obvious to advisers and is the paragraph clients reread. Leaving it out invites the panicked phone calls the whole letter exists to prevent.
Beyond the three questions, good wording is joint where possible, seller and buyer signing together; it gives a named contact and a real phone number; it states any action required and the deadline for it; and it never oversells. The letter is not a marketing document for the buyer. Clients forgive a plain letter; they do not forgive discovering that the "exciting next chapter" meant a new adviser they never met and an increased fee.
The sequencing mistake: telling clients before the deal is certain
The most expensive communication error in practice sales is telling clients too early. It feels like transparency. It behaves like self-harm.
Deals change and deals die. Heads of terms are not a transaction; due diligence reshapes price and structure; funding falls through; a buyer's board says no late in the day. How long a sale takes is consistently underestimated, which stretches the window in which an early announcement can go stale. A client told in month two about a sale that completes, differently, in month eleven has spent nine months in uncertainty. Some will have moved. The ones most likely to move are the engaged, higher-value clients with options, exactly the ones the buyer priced.
The damage is asymmetric. If the deal completes, early disclosure gained you nothing that disclosure at completion would not have given you. If the deal fails, you now own a client bank that believes you are leaving, a workforce that knows you tried to sell, and a valuation problem for the next buyer, who will hear about the attrition and ask why. You cannot untell people.
The working rule: clients hear when the deal is certain, meaning exchanged or completed, with the novation programme agreed and the buyer's onboarding ready to receive them. Before that point, the circle of knowledge stays as small as the transaction allows: you, your advisers, key staff under confidentiality when the process genuinely requires them, and the buyer. Drafting the letter early is good practice. Sending it early is how firms turn a completed sale into a smaller one.
None of this is complicated, but all of it is sequenced, and the sequence is unforgiving in one direction only. Late communication costs you some goodwill; early communication can cost you the deal and part of the price. If you are weighing what that price might be in the first place, the free IFA valuation calculator will give you a range to react to and explain the factors affecting it.