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Law firm and professional practice acquisition in Austria: client base, data protection and professional rules

Law firm or practice acquisition in Austria: transition models, client and patient base under the GDPR, admission and professional rules.

BRANDAUER Rechtsanwälte
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BRANDAUER Rechtsanwälte

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Every transaction is handled by a coordinated team of lawyers, legal staff and specialists. In company acquisition matters we look at structure, contract, tax and liability together.

2 July 2026 · Mag. Bernhard Brandauer, Rechtsanwalt

The acquisition of a law firm or a professional practice is a special form of business succession. It combines the logic of the classical company acquisition with the particularities of liberal professions: personal trust relationships with clients or patients, professional admissions, professional code requirements and sensitive data sets. Whoever overlooks these layers risks damaging the true value of the inherited unit.

This post explains the cornerstones of a law firm or practice acquisition in Austria. The focus is on transition models from share acquisitions in professional vehicles to a classical sale of a practice, the handling of the client or patient base under the GDPR, the importance of admission and professional rules, employment relationships, premises and ongoing mandates or treatment relationships.

From a lawyer perspective a clean layering of advice matters. Brandauer Rechtsanwälte accompanies the civil and corporate side of such a transaction. The professional law assessment of the relevant codes, such as the Austrian Bar Act, the Notarial Code or medical codes, lies with the competent professional bodies and, where applicable, separate specialised advice. Brandauer does not replace such professional admission.

Classify your takeover

Which form of practice or firm are you taking over?

Answer one or two questions on the profession and the preparation. You receive an initial classification of the most important steps for taking over a law firm or practice.

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01 Question 1

Which type of liberal profession is involved in the takeover?

Law, notary, tax advice, audit or medical and dental practices each follow their own professional and admission rules. The choice of structure is guided by these professional law requirements.

All paths at a glance

Overview of all answers.

01

The preparation is in place; now the clean contractual implementation counts.

If transfer and data protection are prepared, the takeover is well set up. Pay attention in addition to the lease of the premises, to the employment contracts, to ongoing mandates or patient relationships and to the information of the relevant professional authority required by professional law. A deeper view on employee topics is provided by the post on the transfer of business under AVRAG.

A short legal review ensures that the requirements of your professional code and the expectations of the inherited client or patient base are consistently mapped in the contract.

02

The preparation is incomplete; sharpening it is advisable.

If the transfer of the client or patient base remains unregulated, data protection breaches and a loss of trust among those affected loom. Complete the preparation: a clear data protection strategy with a consent or information concept, a communicative accompaniment of the handover and a contractual arrangement with the seller on the existing base. A deeper view on data protection in the M&A context is provided by the post on data protection due diligence.

Have the handover reviewed before signing. An informal transfer of the client or patient base is risky under data protection law.

Transition models: share purchase, sale of practice and gradual admission

Several routes are available for the acquisition of a law firm or practice. A frequent route is the entry into an existing professional vehicle, for example through the acquisition of shares in a law or audit GmbH. Here the share deal logic applies: the company remains in place and the acquirer enters as a new shareholder.

A second possibility is the classical sale of a practice in which a sole proprietorship or a practice is transferred as an economic unit. Structurally this route resembles an asset deal: premises, inventory, ongoing mandates or treatment relationships and the client or patient base are transferred together. The choice of structure should be guided by professional law requirements and tax considerations.

A third variant is the gradual admission: a new partner first enters as an employed practitioner or junior partner and gradually takes on shares, often combined with the later departure of the existing owner. How these routes differ at base is shown by the post on share deal and asset deal. A deeper view on succession is provided by our topic page on business succession.

Client and patient base under the GDPR

The client or patient base is the economic core of a law firm or practice takeover. It consists of personal data whose transfer is governed by the GDPR. A simple handover of files is problematic under data protection law because the seller may pass on the data of those affected for a different processing only under narrow conditions.

Common models inform the clients or patients before the handover and either obtain their express consent to the file transfer or give them an opportunity to object. For sensitive data, such as health data, stricter requirements apply. Professional confidentiality duties also play a role and require that the new practitioner is subject to the same duties.

The acquirer should document the inherited data carefully and integrate them into its own processing activities. A deeper view on the handling of personal data in the transaction context is provided by the post on data protection due diligence.

Professional admission, code rules and confidentiality

Every law firm or practice acquisition requires the acquirer to hold the necessary professional admission. For lawyers this is the entry on the list of lawyers, for notaries the appointment as a notary, for tax advisers and auditors the corresponding appointment. For doctors and dentists the medical licence and, where applicable, the public health insurance contract are needed. The assessment under professional law lies with the competent professional bodies and the respective codes.

In addition, professional codes govern advertising, mandate acceptance, conflicts of interest and confidentiality. They protect the public interest in an integer exercise of the profession and shape the acquisition process. Brandauer Rechtsanwälte accompanies the civil side and the contract design; the assessment of professional code questions in detail, such as advertising restrictions or conflicts of interest in the individual case, is to be aligned with the competent professional body.

In the contract the professional law duties should be expressly observed. Non-compete clauses of the seller, garden leave arrangements and the protection of joint clients or patients are delicate points; they can only be agreed to the extent permitted by the professional codes and competition rules. The concept of non-compete clause is explored in the glossary entry on the non-compete clause.

Three routes of takeover

Share acquisition, sale of practice and gradual admission

The choice of structure depends on the profession, the size of the unit and the time horizon of the handover. The overview shows typical strengths and weaknesses.

Comparison of the three most common routes of a law firm or practice acquisition by contract form, client or patient base and handover speed
Aspect Share acquisition in a professional vehicle Sale of practice as sole proprietorship
Contract form Share deal in the professional company Asset deal with individual assets Specificity of the transferred items required
Client or patient base Remains with the company Transfer requires a GDPR concept Information and right to object of those affected
Professional admission Practice of the company continues Own admission of the acquirer required Code rules and admission rules per profession
Employees Remain with the company Transition under AVRAG on sale of practice Information and transition meetings important
Speed of handover Effective date with a transition phase Effective date and takeover of the location Gradual admission often sensible

The professional law assessment of any structure lies with the competent professional body. Brandauer Rechtsanwälte accompanies the civil and corporate side and does not replace a professional admission.

Caution on the client or patient base: An informal handover of files without a consent or information concept regularly breaches the GDPR and may upset sensitive clients or patients. Have the handover reviewed before signing. Booking an initial consultation (72 euro) can quickly bring clarity.

Employees, premises and ongoing mandates

On a sale of practice the employment relationships of the existing staff transfer to the acquirer under the conditions of a transfer of business under the Employment Contract Law Adaptation Act. On a takeover through a share acquisition the staff remains with the company and thus part of the unit. A well-prepared handover strengthens the bond and stabilises the client or patient base.

The premises of the practice are a topic of their own. On a share acquisition the lease remains with the company; on an asset deal a transfer of contract is needed, which as a rule requires the consent of the landlord. Early clarification of the lease conditions avoids delays at the effective date.

Ongoing mandates or treatment relationships are particularly sensitive. They cannot simply be transferred without involvement of those affected; depending on the profession, special duties apply to the handover of files, to the maintenance of confidentiality and to the continuity of care or representation. An initial assessment of the risks is provided by our M&A transaction risk profile.

Frequent questions

Law firm and practice acquisition in Austria.

Which routes exist for taking over a law firm or practice? +

Common routes are the entry into a professional vehicle via a share acquisition, the takeover as a sale of a practice in the form of an asset deal and the gradual admission as an employed practitioner with a later participation. Which route fits depends on the profession, the size of the unit, the time horizon of the handover and tax considerations and should be aligned with the competent professional body.

What must be observed in respect of the client or patient base under data protection law? +

The client or patient base consists of personal data whose transfer is governed by the GDPR. Common models inform those affected before the handover and either obtain their consent or give them an opportunity to object. For sensitive data, such as health data, stricter requirements apply. Professional confidentiality duties play an additional role.

Do Brandauer Rechtsanwälte also advise on professional code questions in detail? +

Brandauer Rechtsanwälte accompany the civil and corporate side of a law firm or practice acquisition, that is, contract design, employee and lease questions, data protection and the general structural decision. The assessment of the relevant professional codes and admission questions lies with the competent professional bodies and, where applicable, separate specialised advice; Brandauer does not replace such professional admission.

Topics
Practice acquisitionLaw firm acquisitionClient basePatient baseProfessional rules

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