Most attorneys who are thinking about selling their practice spend a lot of time on valuation. How much is the book worth? What multiple will the buyer pay? What does the earnout look like? These are fair questions, and the answers matter. But there is a set of questions that will determine whether any of this actually works, and attorneys often underestimate them until they are deep in the process: what do you owe your clients, legally and ethically, when you sell?
The answer is more demanding than most people expect. And getting it wrong does not just create bar complaints. It can unravel a deal.
What Rule 1.17 Actually Requires
The ABA Model Rule 1.17 governs the sale of a law practice, and its requirements are specific. The seller must give written notice to each client whose matter would be transferred. That notice has to include the fact of the sale, the identity of the purchasing attorney or firm, and the client’s right to retain different counsel or take their file elsewhere. The client has to have a reasonable opportunity to act on that information before the transfer goes forward. If a client does not respond, that silence can be treated as consent, but only after a defined waiting period and only if the notice itself was adequate.
Forty-six states have adopted some version of Rule 1.17, though the specifics vary. A handful of states have their own frameworks, or have modified the ABA model in ways that matter. California, for instance, has its own distinct rules around client consent in firm transitions, and practitioners there have learned the hard way that assuming the ABA model applies everywhere is a mistake. Before any deal closes, you need to know exactly which version of the rule governs your practice.
What this means practically is that you cannot treat client notification as a formality that happens at the end. It is a structural element of the transaction. The timeline for client notice, the response window, and the mechanics of file transfer all have to be built into the deal from the beginning. Buyers who have done this before will expect it. Buyers who have not done this before will need you to insist on it.
The Confidentiality Problem You Have to Solve First
Here is where things get complicated in a way that surprises a lot of people going through this for the first time. Before you can give proper notice to clients, you have to disclose information about your practice to a potential buyer. That disclosure happens during due diligence, which means it happens before any deal is final, and often before clients know anything is contemplated.
The standard resolution is a non-disclosure agreement combined with what ethicists sometimes call a “screening” approach to the information shared. You give the buyer enough to evaluate the practice without revealing client-specific confidential information. Matter type, volume, revenue by category, general client tenure, and staff structure can all be shared without identifying individual clients by name or disclosing the substance of their legal matters. The goal is to allow a meaningful evaluation of what you are selling while honoring your obligations under Rule 1.6.
This is not a theoretical concern. In 2019, a Florida Bar opinion examined exactly this tension and concluded that limited disclosure for due diligence purposes is permissible, but that the seller must take reasonable steps to prevent unnecessary exposure of client confidences. The practical implication is that you need protocols in place before due diligence begins, not after. Who sees what, when, and under what terms should be documented.
Continuity Is a Client Protection, Not a Transition Formality
I want to be direct about something. The ethics rules around client notification are often treated as a box to check. Get the letters out, wait the required period, document the responses. But that framing misses what the obligation is actually about.
The clients who built your practice did not hire a firm. They hired you. Many of them have been with you for ten or fifteen years. They trusted you with things that matter: a business sale, an estate plan, a custody dispute, a crisis that came up on a Friday afternoon. When you sell, you are making a decision that affects all of them, and they have a right to know about it in a way that gives them a genuine choice.
That means the notice letter cannot read like a legal disclosure form. It has to communicate, in plain language, what is happening, who will be taking over their work, why you believe that transition serves their interests, and what their options are. The clients who have been with you the longest deserve a phone call before the letter arrives. That is not required by any ethics rule. It is just the right way to do it.
Firms that handle this well, where the client communication is thoughtful and the transition is managed with real care, see dramatically higher client retention through the transaction. In my experience, client attrition in a well-managed succession is typically in the range of 10 to 20 percent. In deals where the notification process was treated as a formality or handled too late, that number climbs. The clients who were surprised, or who felt they had been sold without their knowledge, do not stay.
The Valuation Consequences of Getting This Right, or Wrong
Law firm transactions are predominantly relationship-driven, which is why most earnout structures in this space are tied to client retention. According to research published by the Altman Weil Law Firms in Transition survey, client portability is consistently cited among the top three risk factors in law firm M&A. A buyer paying a multiple of revenue has made an implicit assumption about how much of that revenue survives the transition. If the client notification process is mishandled and attrition is higher than projected, you will feel it in the earnout.
This is not abstract. I have seen deals where the economics looked solid at signing and fell apart in the twelve months after closing because clients felt poorly handled during the transition. The legal work transferred, but the relationship did not. Some of those clients found new counsel. Some consolidated with other firms they already had relationships with. A few were simply upset that they had not been consulted before the decision was made.
The Thomson Reuters Institute’s 2023 State of the Legal Market report noted that client loyalty to individual attorneys, rather than to the firm, remains a defining characteristic of small and midsize firm practice. That report is available at thomsonreuters.com. The implication for succession planning is direct: when the attorney leaves, the client considers their options. Whether they stay depends almost entirely on how the transition was handled.
How to Structure Client Communication in a Law Firm Sale
The mechanics of client notification should be planned alongside the transaction documents, not after them. Here is how I advise clients to approach it.
Start with a segmented client review
Before any notice goes out, categorize your active matters by complexity, relationship depth, and strategic importance to the buyer. Clients with long tenures and large matters need to be handled differently than clients with routine, transactional work. The transition plan for a client you have represented for twenty years in their closely held business matters is different from the plan for a client whose estate plan was completed two years ago and who has had no contact since.
Build the notice period into the closing timeline
Most well-structured law firm transactions include a defined notification period, typically thirty to sixty days, during which clients are notified and given the opportunity to respond. The closing should not occur until that period has run and the results have been reviewed. If a significant portion of your major clients object or choose new counsel, that is material information for the buyer. The deal structure may need to be adjusted.
Do not delegate the difficult conversations
The letters matter, but the phone calls matter more. For your most significant client relationships, the notification should come from you, directly, before the written notice arrives. Those clients deserve to hear your voice and your reasoning. They deserve to ask questions and get honest answers. The attorney handling the call should be you, not an associate and not an intermediary.
The Ethical Floor Is Not the Standard to Aim For
Bar rules set the minimum. They tell you what you must do to avoid professional discipline. But the attorneys I have worked with who transition their practices successfully, who preserve most of their relationships and leave with their reputations intact, do considerably more than the minimum.
They start the client communication process earlier than required. They are transparent with clients about their reasons for the transition. They take the time to personally introduce key clients to the attorneys who will be handling their work going forward. They stay available after the closing to answer questions and smooth the handoff. Some of them structure informal consulting arrangements with the buying firm for precisely this reason.
That level of care is not just good ethics. It is good business. It protects the earnout. It protects the buyer’s investment. And it protects the thing you spent thirty years building, which is a reputation for handling people’s most important matters with integrity.
If you are beginning to think about what a practice transition looks like for you, the client continuity question should be on the table from the first conversation. It is not the last step in the process. It is one of the first things we work through together.
Ready to Think Through Your Transition?
ExitPath Partners advises law firm managing partners on the full range of succession, merger, and exit decisions. If you are beginning to think about what a transition looks like for your practice, including how to handle the client continuity piece correctly from the start, I am happy to have that conversation. There is no obligation, and there is no pitch. It is just a conversation between practitioners about something that matters.
Schedule a confidential consultation at exitpathpartners.com.
You may also find our attorney transition planning overview useful as a starting point, as well as our page on law firm exit planning.