Selling Your Law Practice: Model Rule 1.17 Ethics Requirements Explained

Why Selling a Law Practice Is Different From Selling a Business

If you have spent decades building a solo or small-firm practice, you may be thinking about what comes next. Maybe retirement is on the horizon. Maybe you are transitioning to a different career. Whatever the reason, you want to know: can I actually sell my law practice, and what does it take to do it ethically?

The short answer is yes — you can sell a law practice. But the rules governing that sale are nothing like selling a restaurant, a consulting firm, or a retail store. Because a law practice is built on confidential client relationships, fiduciary duties, and professional obligations, the ethics rules impose guardrails that any seller and purchaser must follow. The American Bar Association's Model Rule 1.17 governs the sale of a law practice in jurisdictions that have adopted it, and its requirements are strict. Texas, however, takes a somewhat different approach — one that every Texas attorney needs to understand before listing their practice for sale.

We have written previously about how to sell a law practice in Texas and about what every attorney acquirer needs to know about due diligence and deal structure. This article goes deeper into the ethics mechanics — what Model Rule 1.17 requires, how Texas rules differ, and what valuation approaches actually work for client-based intangible assets.

The Generational Retirement Wave Makes This Urgent

The legal profession faces a demographic shift that is becoming impossible to ignore. The ABA's Profile of the Legal Profession reports that the number of lawyers aged 65 and older has been growing steadily, and solo practitioners — who make up a significant share of the bar — are disproportionately concentrated in older age brackets. Many of these attorneys will need to wind down or sell within the next decade. Unlike large firms that can absorb partner retirements through succession planning and institutional infrastructure, solo and small-firm attorneys carry the full weight of client continuity on their own shoulders.

Selling — rather than simply closing — preserves value for the seller and continuity for clients. But it must be done right.

ABA Model Rule 1.17: The Core Requirements

ABA Model Rule 1.17, titled "Sale of a Law Practice," permits a lawyer or law firm to sell or purchase a law practice, or an area of practice, if several conditions are met. The rule's comment opens with a foundational principle: "The practice of law is a profession, not merely a business. Clients are not commodities that can be purchased and sold at will."

1. The Entire Practice (or Entire Area) Must Be Sold

Model Rule 1.17(b) requires that the seller's entire practice, or an entire area of practice, be sold to one or more lawyers or law firms. You cannot cherry-pick the most lucrative client files and leave the rest. The rule's comment explains that this prohibition "protects those clients whose matters are less lucrative and who might find it difficult to secure another legal practitioner if a sale could be limited to substantial fee-generating matters." The purchaser must undertake all client matters in the practice or practice area, subject to client consent and conflict screening.

2. Written Notice to Every Client

Under Model Rule 1.17(c), the seller must give written notice to each client regarding:

• The proposed sale;
• The client's right to retain another attorney or take possession of their file; and
• The fact that the client's consent to the transfer of files will be presumed if the client does not take any action or object within ninety (90) days of receiving the notice.

This 90-day deemed-consent mechanism is one of the rule's most important features. It allows the sale to proceed even when some clients are unresponsive — but only after the seller has made a genuine effort to provide actual written notice. If a client cannot be located or given notice, the representation may be transferred to the purchaser only upon a court order authorizing the transfer, as Model Rule 1.17(c) provides. The seller may disclose client information to the court in camera only to the extent necessary to obtain that order.

3. No Fee Increases Because of the Sale

Model Rule 1.17(d) prohibits the purchaser from increasing fees charged to clients by reason of the sale. Existing fee arrangements between the seller and the client must be honored by the purchaser. This prevents the purchaser from recouping the purchase price by passing the cost along to inherited clients — a practice that would undermine the fiduciary nature of the attorney-client relationship.

4. The Purchaser Must Be a Licensed Attorney

The rule requires that the practice be sold to "one or more lawyers or law firms." A non-lawyer cannot purchase a law practice. This restriction flows from the broader prohibition on fee-sharing with non-lawyers under Model Rule 1.5 and the prohibition against aiding the unauthorized practice of law under Model Rule 5.5.

5. Confidentiality and Conflicts Must Be Addressed

The rule's comment clarifies that negotiations between seller and prospective purchaser before disclosure of client-specific information do not violate confidentiality rules — similar to preliminary discussions about a possible merger. However, providing the purchaser access to client-specific information and files requires client consent. The purchaser must also screen for conflicts of interest under Model Rule 1.7 and must undertake the representation competently under Model Rule 1.1.

6. Professional Liability Insurance

Model Rule 1.17(e) requires the seller to attest that the seller has made reasonable efforts to ensure that the purchaser has professional liability insurance or has obtained an agreement to provide such insurance. The purchaser must maintain coverage that is reasonably comparable to the seller's coverage or must otherwise satisfy any legal requirements. This protects clients from gaps in malpractice coverage during the transition.

How Texas Rules Differ From the ABA Model

Here is where it gets interesting — and where many Texas attorneys get tripped up. The Texas Disciplinary Rules of Professional Conduct do not include a Rule 1.17 titled "Sale of Law Practice" in the same way the ABA Model Rules do. In Texas's numbering system, Rule 1.17 addresses "Clients with Diminished Capacity" — an entirely different topic.

That does not mean Texas attorneys are free to sell practices without ethical constraints. Far from it. The sale of a law practice in Texas is governed by a combination of:

• Texas Disciplinary Rule 1.04 (Fees) — particularly the prohibition on fee-sharing with non-lawyers in Rule 1.04(g);
• Texas Disciplinary Rule 1.05 (Confidentiality of Information) — which governs what client information may be disclosed to a prospective purchaser;
• Texas Disciplinary Rule 1.06 (Conflict of Interest) — which the purchaser must screen before accepting inherited matters;
• Texas Disciplinary Rule 5.04 (Professional Independence of a Lawyer) — which prohibits non-lawyer ownership and fee-splitting arrangements that would compromise professional judgment; and
• Professional Ethics Committee Opinions — the State Bar of Texas's Professional Ethics Committee issues opinions that guide attorneys on specific ethical questions, including succession and practice transfer.

The practical takeaway: Texas attorneys selling a practice must look beyond a single rule. The sale must comply with multiple disciplinary rules simultaneously, and the absence of a standalone "Sale of Law Practice" rule means there is less procedural safe harbor (like the ABA's 90-day deemed-consent mechanism) built into the Texas rules themselves. Texas attorneys should consult the State Bar of Texas's ethics resources and consider seeking an ethics opinion if the transaction raises novel questions.

If you are also planning for the possibility of incapacity or death — not just a voluntary sale — our guide to the solo attorney's succession plan covers the protective mechanisms Texas attorneys should have in place regardless of whether a sale is imminent.

Valuation: What Is a Client-Based Practice Actually Worth?

Once you understand the ethics rules, the next question is valuation. Law practices are unusual businesses because their primary asset — the client roster — is intangible, relationship-based, and ethically constrained. You cannot simply list your practice on a business-for-sale marketplace and expect a standard valuation formula to apply.

Several valuation methods are commonly discussed, but each has significant limitations for law practices, as experienced law practice appraiser Roy Ginsburg has explained:

Asset-Based Approach

This method adds up tangible assets (furniture, equipment, technology) and subtracts liabilities. For most law firms, physical assets are a small fraction of true value. The most valuable asset — goodwill, client relationships, reputation — is not captured. Relying on this method alone dramatically undervalues a practice.

Market Approach

This method looks at comparable sales: if a similar firm sold for X, yours should be worth Y. The problem is that most law firm transactions are confidential, so reliable data is scarce. "Comparable" firms are rarely truly comparable — a family law practice, an immigration practice, and a personal injury practice generate revenue in fundamentally different ways.

Rule of Thumb (Multiple of Revenue)

This approach values the practice as a multiple of gross revenue (e.g., 1.5x annual revenue). While simple, it assumes all practice areas generate revenue similarly, which is not true. A contingency-fee personal injury practice and an hourly billing estate planning practice operate on entirely different economics. Without a robust database of comparable law firm transactions — which does not exist in any meaningful way — the multiple is pure speculation.

Excess Earnings Method

This method calculates the amount by which the practice's average earnings, less the fair return on physical assets, exceeds the fair compensation of a comparable attorney — then capitalizes that excess. It attempts to isolate the value of intangible goodwill. While more sophisticated, it still relies on assumptions about client retention rates and the risk of clients not following the purchaser.

Discounted Cash Flow (DCF)

DCF projects future cash flows based on historical performance, applies a growth rate, and discounts everything back to present value. The challenge for law practices is that future revenue depends heavily on whether clients actually follow the purchaser — a variable that is hard to predict with the precision DCF demands.

A Practical Alternative: Predictable Future Revenue

Ginsburg's approach, developed over 15 years of appraising law firms, asks a deceptively simple question: When Monday morning comes after the seller leaves, will clients still contact the office and work with the successor? If yes, the next question is how much predictable future revenue a successor could capture in the first few years. Then, thinking about what the seller would expect to receive in referral fees (as a percentage of that revenue) provides a conceptual framework for the purchase price.

This method is admittedly more art than science. But it forces the parties to confront the real variable that matters: client retention. No valuation method can overcome the fundamental reality that clients are not bound to any attorney — they can leave at any time. The ABA Model Rule 1.17 comment itself acknowledges that "all elements of client autonomy, including the client's absolute right to discharge a lawyer and transfer the representation to another, survive the sale of the practice."

Client Consent: The Gatekeeping Mechanism

Under ABA Model Rule 1.17, client consent is the linchpin of any ethical practice sale. The rule's 90-day deemed-consent provision gives the process a defined timeline, but sellers should not rely on silence alone. Best practice — and the approach we recommend to every attorney we counsel — is to:

1. Send written notice early, well before the closing date, so clients have time to make informed decisions.
2. Offer a personal conversation with each client, not just a form letter. A phone call from the selling attorney explaining the transition and vouching for the purchaser goes a long way toward client retention.
3. Honor every objection. If a client objects or asks for their file, comply immediately. The client's right to take their file and retain new counsel is absolute.
4. Document everything. Keep records of notices sent, responses received, and any court orders obtained for clients who could not be located.

In Texas, where there is no built-in 90-day deemed-consent mechanism in the disciplinary rules, obtaining express written consent from each client is even more important. Without the procedural safe harbor of Model Rule 1.17, Texas sellers should err on the side of obtaining affirmative consent to avoid any appearance of improper fee-sharing or unauthorized disclosure of confidential information.

The Fee-Sharing Trap

One of the most common mistakes in practice sales is structuring the deal as ongoing fee-sharing between seller and purchaser. Under both ABA Model Rule 1.5 and Texas Disciplinary Rule 1.04(g), fee-sharing with non-lawyers is prohibited, and fee-sharing among lawyers is permitted only under specific conditions.

Model Rule 1.17 permits the seller to receive compensation for the "reasonable value of the practice" — which can be a lump sum, a structured payout, or even an earnout based on collected revenue from inherited clients. But the payment must be for the practice, not a cut of fees from ongoing client matters that the seller is no longer working on. The distinction matters: a purchase price paid for goodwill and the transfer of client relationships is ethical; an ongoing percentage of fees from clients the seller no longer serves looks like a referral fee disguised as a sale.

Professional Liability Insurance: Do Not Leave a Gap

Both seller and purchaser need to think carefully about malpractice coverage. The seller's policy may not cover acts of the purchaser, and the purchaser's policy may not cover acts that occurred before the purchase. Clients who have claims arising from work done by the seller need to know whom to call. The purchase agreement should address:

• Whether the seller will maintain tail coverage for prior acts;
• Whether the purchaser's policy covers assumed liabilities; and
• How clients will be notified about the insurance transition.

Model Rule 1.17(e) specifically requires the seller to make reasonable efforts to ensure the purchaser has professional liability insurance. In Texas, while the disciplinary rules do not mandate malpractice insurance for all attorneys, the State Bar of Texas requires attorneys who do not carry malpractice insurance to disclose that fact to clients in writing. Any purchaser inheriting clients should be prepared to make the same disclosure if uninsured.

Actionable Next Steps

If you are a solo or small-firm attorney in Texas considering selling your practice, here is what we recommend you do — in this order:

1. Audit your client roster. Identify which clients are active, which are dormant, and which have matters that could create conflicts for a potential purchaser. This is also the first step in any valuation.
2. Get a practice appraisal. Work with someone who specializes in law firm valuation — not a general business appraiser. The intangible nature of a law practice demands a methodology that accounts for client retention risk.
3. Consult an ethics attorney. Before any negotiations begin, understand which rules apply to your situation — especially in Texas, where the framework differs from the ABA Model Rules. If your sale raises novel questions, consider requesting an opinion from the State Bar of Texas Professional Ethics Committee.
4. Identify a qualified purchaser. The purchaser must be a licensed attorney in good standing. Screen for conflicts early — before client-specific information is shared. Consider whether the purchaser's practice areas and fee structures are compatible with your clients' expectations.
5. Plan the client notice. Draft the written notice carefully. In jurisdictions following Model Rule 1.17, the 90-day clock starts on receipt. In Texas, plan for affirmative written consent from every client.
6. Structure the deal ethically. The purchase price should compensate the seller for the value of the practice — not for future fees from clients the seller will no longer represent. An earnout tied to revenue retention can work, but it must be structured as a purchase-price adjustment, not as ongoing fee-sharing.
7. Address insurance continuity. Determine whether tail coverage is needed, whether the purchaser's policy covers assumed liabilities, and how clients will be informed about the transition.
8. Plan for the files. Every client file must be offered to the client or transferred to the purchaser. For clients who cannot be located, follow the appropriate court-order procedure to authorize transfer.

Selling a law practice is one of the most significant professional decisions you will make. Done well, it rewards a career of hard work and ensures your clients are in good hands. Done poorly, it can create ethics violations, malpractice exposure, and disappointed clients. The rules are navigable — but they require careful attention and experienced counsel.