Selling a Professional Practice: Valuing a Client or Patient Base

Quick answer. Selling a professional practice is above all transferring a client or patient base, whose value is often estimated as a percentage of annual revenue, adjusted for the profession and client loyalty. The sale is lawful provided the client's or patient's free choice is preserved. The professional capital gain can be fully exempt up to 500,000 euros under Article 238 quindecies of the French Tax Code, subject to a seniority condition.

In a liberal profession — health, law, accountancy, consulting, engineering — the central asset is neither inventory nor a factory: it is the client or patient base, a recurring flow of business attached to a professional and a place. It is this intangible that the successor buys, sometimes complemented by premises, equipment and contracts.

The liberal specificity lies in the personal nature of the relationship: the client or patient freely chooses their professional. The sale cannot therefore "deliver" a client base as one transfers inventory; it organises the introduction of the successor and the handover of trust. Case law has accepted this: the sale of a civil client base is lawful provided the client's or patient's free choice is safeguarded. This logic echoes that, more broadly, of buying a patient base.

The most common method relates the value of the base to a percentage of annual revenue, or to a multiple of the surplus generated. The percentages vary greatly by profession, revenue regularity, dependence on the practitioner and transferability of the relationship.

The percentages of revenue sometimes cited by profession are only indicative starting points, to be adjusted case by case as in any valuation exercise. A base highly dependent on the departing practitioner will be worth far less than one carried by a team: this is why reducing dependence on the practitioner before the sale increases value.

The sale of a professional client base generates, for the seller, a professional capital gain. Several exemption regimes may apply; the most structuring for a practice sale is Article 238 quindecies of the Tax Code.

This article exempts gains realised on the transfer of a sole proprietorship or a complete branch of activity, which covers the sale of a professional practice, provided the activity has been carried on for at least five years. The exemption is total when the value of the transferred items does not exceed 500,000 euros, and partial when it lies between 500,000 and 1,000,000 euros; beyond that, the gain is taxed under ordinary rules. These thresholds were raised by the 2022 finance act.

Other schemes may combine or substitute, notably the exemption tied to the seller's retirement (Article 151 septies A of the Tax Code) or the one based on revenue (Article 151 septies). Choosing the most favourable regime depends on the seller's precise situation and is prepared upstream with tax advice.

The sale of a professional practice rests on a few decisive clauses:

1. The client-introduction clause: the seller undertakes to actively introduce their successor and foster the handover of the relationship, without being able to guarantee retention of the base.
2. The non-compete or non-re-establishment clause: it protects the buyer from the seller returning nearby, within proportionate limits of duration and area.
3. The support period: a transition during which the seller introduces the successor secures the handover of trust.
4. The payment terms: a vendor loan is common, sometimes with a price-revision clause based on the base actually retained.

The transfer of a professional practice is ideally prepared one to two years before departure. The more personal the relationship with the client base, the more preparation matters, because it is what turns a base attached to a person into a transferable client base.

1. Make revenue reliable: clear accounts and regular revenue reassure the successor and support value.
2. Structure the organisation: delegate, formalise files and, where possible, associate a colleague who could become the successor.
3. Introduce the successor gradually: an introduction spread over time secures the handover of trust far better than an abrupt changeover.
4. Anticipate the tax: check eligibility for Article 238 quindecies and, where relevant, align retirement with Article 151 septies A.

The post-sale support period, often a few months, plays a decisive role in relationship professions: it lets the seller introduce their clients or patients, pass on the specifics of the files and establish the successor's legitimacy. A vendor loan, sometimes with a revision clause based on the base actually retained, aligns interests and eases the buyer's financing. Finally, remember that the value of a professional practice is also a matter of reputation and file quality: a satisfied client base, up-to-date files and a stable team are worth far more than a mere revenue stream. It is this patient preparation that distinguishes a successful transfer from a simple cessation of activity.

Health professions. The patient's free choice is a matter of public order; the sale organises the introduction, never a guarantee of the patient base. Professional-body rules frame the successor's establishment.

Liberal-profession companies. Where the activity is held in a company, the sale concerns the shares: taxation shifts to the share-sale gains regime, and Article 238 quindecies does not apply in the same way.

Group practice. In a group practice, the value of the sold share depends on the agreements between partners and the base actually attached to the departing professional.

• Distinguish a client-base sale from a share sale: the tax regime differs radically depending on whether you sell an individual client base or the shares of a professional company.
• Check eligibility for Article 238 quindecies: at least five years of activity, value of transferred items within the 500,000 and 1,000,000-euro thresholds.
• Respect free choice: no clause can guarantee retention of the client or patient base.
• Anticipate dependence on the practitioner: too personal a base transfers poorly; preparation increases value.

Recently, a liberal professional was considering selling her client base after more than twenty years of practice. By preparing the transfer a year ahead — structuring the team, formalising the files, gradually introducing the successor — we both supported the value of the base and secured the Article 238 quindecies exemption, the value of the transferred items remaining below the total-exemption threshold. The seller handed over calmly, with no tax on the gain attached to the base.

Selling a professional practice is not selling an ordinary business: the personal dimension of the relationship demands method and anticipation. Our role as chartered accountant is to value the base on defensible grounds, optimise the exemption regime and secure the introduction and support clauses.

Ultimately, selling a professional practice transfers a relationship of trust as much as an asset. This is why we also support our clients on the human side, helping them choose the right successor and organise a handover respectful of both their clients and their own professional history.

Hayot Expertise advice. Prepare the sale of your practice one to two years ahead: structure the organisation to reduce dependence on your person, document the value of the base and check eligibility for Article 238 quindecies. We value your base, optimise the tax and secure the sale deed.