Year after year, professional advisory firms and law firms in Spain are sold or merged into larger firms that are concentrating market share and which, moreover, have teams entirely dedicated to carrying out mergers and acquisitions of professional practices. As a seller of a professional practice, it is advisable to understand the key elements required to properly structure the sale of the professional business you have spent years building, and to successfully negotiate with professionals specialised in the acquisition of law firms and advisory practices.
The sale of a professional practice, whether a tax, accounting, labour advisory firm or a law firm, is a complex transaction that goes far beyond setting a price and signing a contract. As mentioned above, for the seller, proper planning is essential in order to secure a good price in the negotiation and to avoid possible future contingencies, whether employment, tax or corporate, which may arise even after completion of the transaction.
Below, we review a number of key aspects that every seller should analyse before selling their professional practice in Spain.

Written by Abigail Sked
Legal Advisor
1. THE TRANSFER OF EMPLOYEES WHEN SELLING AN ADVISORY PRACTICE
In most cases (where an organised, ongoing business activity is transferred), the sale of a professional office implies the application of the business succession regime set out in Article 44 of the Spanish Workers’ Statute (Estatuto de los Trabajadores). This means that the buyer is automatically subrogated into the existing employment contracts and the existing employment and Social Security obligations.
In order to avoid delays in the transaction, it is important that, as seller, you have your employment matters in order, with no outstanding salary or Social Security debts:
- Social Security contributions must be up to date,
- the contractual conditions of the workforce must be properly documented in order to inform the buyer, including matters such as employee background, leaves of absence, sick leave and other contract suspensions, reductions in working hours, etc.
Any issue that has not been regularised may result in the buyer adjusting the price or applying retentions on the price to cover future contingencies.
It is also important to manage the organisational change and the communication of such an important change of ownership to employees themselves. This is particularly relevant in long-established consulting firms, or even family-run advisory practices or law firms that are closely connected to their staff.
Employment regulations also impose an obligation on the seller to inform the legal representatives of the employees, where they exist, about the main aspects of the transfer: the expected date, the reasons for the transaction, its legal, economic and social consequences, as well as any measures envisaged in respect of the workforce. Proper compliance also helps to reduce employment disputes during the sale process.
In summary, a well-organised workforce in terms of salaries and contracts is an asset from the buyer’s perspective.
2. THE CLIENT PORTFOLIO AS A CRITICAL ASSET IN THE SALE OF A PROFESSIONAL PRACTICE
The main value of a professional practice lies in its client portfolio, but it is also one of the most sensitive elements in the transaction.
The seller should analyse:
- the level of client concentration,
- the recurrence of fees,
- the existence of written contracts,
- client payment defaults,
- and the degree of personal dependence on the selling partner.
The more personal the practice is, the more likely it is that the buyer will make part of the price conditional upon the retention of clients after the sale, or upon the seller remaining involved for a transition period of at least two years to ensure an orderly handover. This often involves negotiating retentions on the agreed purchase price pending confirmation that expected billing targets are met, as well as the seller’s continued involvement within the structure.
The client portfolio, and how it is maintained, is, in summary, a key element in assessing the risk of the transaction.
3. STRUCTURE OF THE TRANSACTION AND WHAT IS BEING TRANSFERRED IN THE SALE OF A PRACTICE
When selling a law firm or advisory practice, it is not the same to sell shares as it is to transfer the assets and liabilities of the business. The structure chosen has direct consequences for:
- the liability assumed by the buyer,
- the continuity of the practice,
- and the tax treatment of the transaction.
From the seller’s perspective, it is essential to precisely define which elements are being transferred (clients, employees, contracts, brand, software, etc.) and to document this correctly. Certain elements of a consulating business may have significant intangible value and may be taken into account and valued in the transaction (such as the brand, the domain name and SEO positioning, certain software configurations, etc.). It is important that these assets are not left undefined in the contract and that what is being sold and what is not being sold is clearly specified in order to avoid unexpected future claims.
It is also important to consider whether, as the seller, you own any real estate associated with the business that you may or may not wish to include in the transaction. This may even increase the overall price of the deal compared to negotiating it separately, as the buyer may be interested in acquiring a property located in a premium area where the advisory firm or practice operates.
In summary, the valuation of the assets will largely determine the price of the transaction.
4. VAT AND THE CONCEPT OF AN AUTONOMOUS ECONOMIC UNIT IN THE SALE OF ADVISORY PRACTICES
From a tax perspective, it is important to differentiate whether an autonomous economic unit is being transferred, given that Article 7 of the Spanish VAT Act excludes from VAT the transfer of a set of elements (tangible and intangible) which together constitute a unit capable of carrying on a business or professional activity by its own means.
Administrative doctrine is clear: transferring isolated assets or merely a client portfolio is not sufficient. In order to fall outside the scope of VAT, there must be an organised structure of material and human resources allowing the acquirer to continue the activity without interruption.
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In other words, if the advisory practice is transferred as an autonomous economic unit, the transaction is not subject to VAT.
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If, on the contrary, only isolated assets or rights are transferred, the transaction will be subject to VAT, similarly to the supply of goods or services, with the corresponding obligation to charge VAT.
An incorrect classification by the seller may lead to tax reassessments, interest and penalties, so this analysis should be carried out before signing.
It should also be noted that transactions subject to VAT are not subject to Transfer Tax (ITP-AJD) under the transfer tax rules, except in the case of real estate exempt from VAT or included within the transfer of a total business estate.
In practical terms, taxes are unavoidable but the tax scenario will differ depending on how the transaction is ultimately structured.
5. TAXATION OF THE GAIN OBTAINED BY THE SELLER WHEN SELLING THEIR PROFESSIONAL PRACTICE
One issue to take into account in the sale of an advisory firm or professional practice is that the income obtained from the sale must be included:
- in Corporate Income Tax, if the seller is a company, or
- in Personal Income Tax, if the seller is an individual.
In this regard, in the case of a company, it is different to sell the client portfolio than to sell the shares of the company. The determination of the gain, the possible application of adjustment coefficients or the classification as savings income or general income may have a significant economic impact. Prior tax planning can make a substantial difference to the seller’s final result.
6. THE SELLER’S CONTINUED INVOLVEMENT AFTER THE SALE OF THE PRACTICE
In many transactions, the buyer requires the selling partner to remain involved for a transitional period in order to facilitate the handover of clients and business know-how.
From the seller’s perspective, it is essential to define the duration of this continued involvement (normally around two years); its legal structure (whether employment, consultancy or hybrid); its tax treatment; and also any protective clauses the parties may wish to agree.
In this regard, it is important to be clear about the basis on which the seller will remain involved: will you continue as a director? Will the contract be protected? Will you have a senior management contract? A general manager contract? A special senior management relationship? Will you contribute under the general Social Security regime or remain under the alternative mutual fund for lawyers? Or as a self-employed worker depending on the position and shareholding you retain?
Continuity does not always work out well. An inadequate structure may create future employment, Social Security and tax problems which are best prevented through proper negotiation in advance.
Ultimately, it is very important to negotiate the conditions governing the seller’s continued involvement or exit as the driving force behind the sale of the advisory firm or law practice.
7. NON-COMPETE CLAUSES FOLLOWING THE SALE OF A LAW FIRM OR CONSULTING PRACTICE
In our sector it is important to understand that what the client is buying is trust. Clients return because they trust that a particular professional will handle their matters well.
Non-compete and non-solicitation agreements are common in these types of transactions and the seller must pay attention to their duration, their territorial scope and their material scope (in other words, which clients, matters or activities are covered by the restriction).
In the negotiation it will be important to agree what compensation is appropriate to offset this restriction on the professional activity in which the seller specialises. For example, it is not the same to agree that one cannot work in the sector at all as it is to agree that one cannot work for any of the clients who were previously clients of the business.
8. DOCUMENTATION AND CONTRACTUAL GUARANTEES IN THE SALE OF A LAW FIRM OR ADVISORY PRACTICE
Proper documentation of the transaction is important in order to facilitate the sale process, because the buyer will have greater confidence if they can quickly understand the position of the business through accounting, employment and corporate documentation presented transparently.
The documentation should accurately reflect, among other matters: the employment and tax situation of the practice; the guarantees provided by the seller; service continuity and transition arrangements; price adjustment mechanisms (very common to prevent the buyer from acquiring something that does not subsequently produce the promised profitability); data protection and professional confidentiality; and the allocation of liability for contingencies arising prior to the sale (as the buyer will carry out their own employment, tax, accounting and corporate due diligence, and will introduce warranty clauses into the sale agreement, potentially adjusting deferred payments to reflect any claims relating to pre-sale issues).
From our perspective as intermediaries, using clear, direct and understandable language, it is important from the outset to understand whether there are any “issues” within the company, whether from a tax, accounting, employment or potential professional liability perspective, because lack of transparency may lead to difficult negotiations or future disputes if the contract is poorly drafted or situations are concealed which the buyer would reject if discovered.
In summary, complete and well-organised documentation will improve both the speed of the process and confidence in the transaction.
9. THE PRICE IN THE SALE OF A LAW FIRM OR CONSULTING PRACTICE
The price is usually the decisive factor in the sale of professional practices. Unless there is urgency due to the seller’s personal circumstances, or professional pride in preserving the firm’s name, price is normally the key element determining the seller’s decision.
We are available to help you assess decisive factors such as sweet equity; investments and costs that the buyer will no longer incur which may increase EBITDA; professional reputation in the sector; internal working procedures that may add value; staff experience as an asset; the structure of the client portfolio; market concentration; and acquisition appetite within the sector.
To assist you, contact us to assess the value of your client portfolio or professional business. We take all these factors and more into account in order to help you achieve the best possible negotiation and sale.
CONCLUSIONS ON THE SALE OF AN ADVISORY PRACTICE OR PROFESSIONAL FIRM
The sale of a professional practice requires detailed analysis of multiple legal, tax and economic factors, as well as effective negotiation with professionals who are usually experienced both in the sector and in negotiating and drafting contracts. Anticipating risks, structuring the transaction correctly and documenting it properly is key to protecting the seller’s interests and ensuring the success of the transaction.
If you are considering selling your professional practice and require assistance with identifying potential buyers or with the legal and tax aspects of the transaction, please do not hesitate to contact us.
Frequently Asked Questions
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At present, experienced employees are an asset for the buyer. Where the sale involves the transfer of an organised business activity in operation, the business succession regime under Article 44 of the Spanish Workers’ Statute (Estatuto de los Trabajadores) applies, and it is standard practice for the buyer to automatically assume the employment contracts together with the same employment and Social Security rights and obligations existing at the time of the transfer.
Where irregular situations exist, it will be necessary to clearly agree the conditions under which the buyer assumes the employees in order to avoid future claims.
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This depends on how the transaction is structured and what exactly is being transferred. If the sale includes a set of tangible and intangible elements that allow the professional activity to continue independently, the transaction may fall outside the scope of VAT pursuant to Article 7 of the Spanish VAT Act.
However, if only isolated assets or rights are transferred (for example, a client portfolio without any supporting structure), the transaction will be subject to VAT.
An incorrect classification may result in tax reassessments, interest and penalties, so it is important to carry out this analysis and decide how and in what manner the transfer will be structured before starting or completing the transaction.
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The tax treatment depends on who the seller is. If the practice belongs to a company, the gain will be included within Corporate Income Tax. If the seller is an individual, it will be taxed under Personal Income Tax (IRPF).
The method of calculating the gain, its classification (as savings income or general income) and the possible application of adjustments or coefficients may have a significant economic impact. Prior tax planning may make a substantial difference to the net result of the transaction.
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Yes, this is very common. In transactions involving professional practices, the buyer will usually require the selling partner to remain involved during a transitional period in order to ensure client continuity, facilitate the transfer of business know-how and help secure the profitability projected at the time of the sale.
This continued involvement may be structured through an employment relationship, a consultancy arrangement or a hybrid model, and its configuration has important legal and tax implications. Properly defining the duration, functions and remuneration is key to avoiding future problems.
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Poor documentation may turn a completed sale into a source of future disputes. The most common risks include claims relating to employment or tax contingencies, unexpected price adjustments, disputes arising from poorly drafted non-compete clauses, or liabilities that have not been properly allocated.
A well-structured agreement, with clear guarantees and adjustment mechanisms, is essential to protect the seller and provide legal certainty to the transaction.
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In most cases, no. In transactions involving the sale of a professional practice, as well as in other structural modifications (business sale, transfer of a line of business, merger, etc.), it is not necessary to obtain the consent of the data subjects in order to transfer their personal data to the buyer.
The legal basis for this data transfer is the legitimate interest of the companies involved and of the data subjects themselves, pursuant to Article 6(1)(f) of the GDPR. In particular, Article 21 of the Spanish Data Protection Act (LOPDGDD) presumes the lawfulness of such processing where it is necessary for the successful completion of the transaction and ensures continuity in the provision of services.
However, the absence of a requirement for consent does not remove the obligation to provide information. The seller must inform data subjects in advance, in accordance with Article 13 GDPR, about the transfer of their data (purpose, legal basis, recipient, rights, etc.), and the buyer must complete this information in accordance with Article 14 GDPR within the applicable time limits.
Furthermore, if the transaction ultimately does not proceed, the potential buyer must immediately delete the personal data received, and the data blocking regime provided for under the LOPDGDD will not apply.
Although the legislation does not expressly require the execution of a data transfer agreement between seller and buyer, this is highly advisable from a compliance and risk management perspective. The Spanish Data Protection Authority (AEPD) itself has highlighted the importance of documenting in writing the conditions of the transfer, the permitted uses of the data and the applicable control mechanisms.
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If you are considering selling your professional practice and would like CONESA LEGAL to assist with identifying potential buyers and advising on the legal and tax aspects of the transaction, the first step is to contact us for an initial and confidential assessment of your situation.
In order to properly analyse your case, it is helpful if you can provide, where possible, the following information about your practice:
- Location of the practice
- Annual turnover for the last five financial years
- Profits for the last five financial years
- Number of employees and their areas of specialisation (tax, accounting, employment, corporate, etc.)
- Characteristics of the client portfolio, indicating the percentage of recurring clients versus occasional clients
- Types of recurring services (tax, accounting, corporate, employment, payroll or others)
- Types of one-off matters typically handled
- Any other relevant information regarding the operation and organisation of the business
- Key aspects to consider in relation to the sale, such as the expected minimum price, payment structure, possible post-sale involvement, or continuity conditions for the practice
All information will be treated with the utmost confidentiality. Following this preliminary analysis, we will be able to introduce you to the most suitable potential buyers.
If you wish, we can begin with an initial exploratory discussion, no strings attached.
What happens to employees in the event of the sale of a professional practice?
Is the sale of a professional practice subject to VAT?
How is the seller taxed on the gain obtained from the sale?
Is it common for the buyer to require the selling partner to remain after closing the deal?
What risks does the seller assume if the transaction is not properly documented?
Is it necessary to obtain consent from clients and employees to transfer their personal data in the sale of a professional practice?
What should I do if I want CONESA LEGAL to help me sell my professional practice?
Author of the article:
Josep Conesa is a lawyer and manager of Conesa Legal, a third generation law firm that has actively participated in purchases, sales, dissolutions and acquisitions of several professional firms and consultancies throughout 30 years of professional practice. He also combines his professional experience with the activity of manager of the firm (from the point of view of marketing and sales; financial and HR), together with the management of operations and coordination of teams in the areas of payroll, tax, accounting and commercial, and teams of labor, civil and criminal lawyers.
