Tax lawyer

As experienced tax lawyers, we offer in-depth expertise in tax matters for individuals and businesses. Our personalized approach aims to optimize your tax situation while ensuring compliance with current regulations, whether for tax planning, dispute resolution or consulting on complex tax issues.

Tax advice and strategy

  • Analysis of your organization's tax risks and opportunities and proposal of appropriate solutions
  • Helping entrepreneurs and managers structure their professional and personal assets
  • Tax structuring of acquisitions and mergers

Assistance with tax audits

  • Tax audit of your company and operations
  • General assistance with tax audits
  • Support in dealing with tax authorities following reassessments and finding solutions

Tax litigation

In front of French jurdictions

  • Representation before all administrative authorities in the pre-litigation tax phase
  • Representation before French courts (civil and administrative) in tax disputes)

Within a unilateral framework

  • Implementation of administrative assistance procedures under tax treaties (Amiable procedure and arbitration)
  • Resolution of damaging double taxation situations (particularly in the area of transfer pricing).

International taxation

  • Tax structuring of companies (supply chain, analysis of tax regimes, VAT)
  • Transfer pricing implementation and defense (economic analysis and documentation)
  • International mobility of employees and managers
  • International wealth structuring for high-net-worth individuals (HNWI)

AlterTax: Tax lawyer based in Paris 17

Based in the heart of Paris's 17th arrondissement, our tax lawyers in Paris bring their expertise in tax law to a diverse clientele, combining a local approach with global knowledge to respond effectively to your legal needs.

Our working method


We listen to our customers and work with them to find the right technical solutions for the jobs they entrust to us.


We are different in the way we work because we are convinced that the future of our profession lies in the added value of our advice, but also in the experience of our customers.


We believe in the strength of the rule of law and in its respect by both our customers and tax authorities. We are convinced that we can only provide our clients with useful advice if we have a thorough understanding of taxation.


We listen to our customers and work with them to find the right technical solutions for the jobs they entrust to us.

At AlterTax, we are well aware that our customers expect us to deliver high added value in the cases they entrust to us.

We focus all our attention on our customers' satisfaction and invest in the best technological tools on the market to offer them a unique experience based on :

  • Smooth interactions with our teams and partners
  • The availability of our resources and tools to collaboratively build the solutions best suited to their needs and thus keep their fees in check.

Why choose us as your tax lawyer?

Altertax Avocats excels in taxation, focusing on international challenges and complex transactions. Our clear communication and practical advice are the fruit of a wealth of experience and a bilingual team committed to providing customized, effective solutions. Here's our methodology:

What's clear can be seen clearly

We are experts in the field of taxation, which we practice exclusively and on a daily basis, mainly on complex, high-stakes issues of :

  • International corporate and personal taxation
  • Taxation of mergers and acquisitions

The quality of our communication reflects the quality of our advice: clear, practical solutions

Our bilingual (French/English) team is well-versed in both the technical and operational aspects of taxation.

This can be acquired :

  • By working on a wide variety of subjects entrusted to us by our clients over more than 20 years in the various firms where we have practised.
  • By listening attentively and sympathetically to our customers to create solutions tailored to their needs and guide them in their choices.
  • Solving problems by implementing technically sound, sometimes original but always practical solutions
  • By using the best technological tools and databases to ensure that our knowledge in the field is constantly updated a highly evolutionary material. As a result, we have set up a monitoring system to keep abreast of regulatory and legislative developments in the tax issues we deal with, both in French law and in all OECD member countries.

    The AlterTax Plus

    In order to support our French customers in their European and worldwide deployment, we have the most powerful economic analysis tools, enabling us to carry out all transfer pricing benchmarks (sales of goods and services, royalties, financial) and also to partially automate the production of all transfer pricing documentation (Local File and Master File) for the international groups we monitor.

    The quality of our work organization is essential to ensure :


    • The fluidity of exchanges with our customers and interactions between our team members so that everyone can contribute in the most efficient way to developing packaged or turnkey solutions for our customers.
    • The software platforms on the market did not provide a turnkey solution adapted to our needs, so we helped design and develop an innovative platform (to find out more

    The best of technology at the service of our customers :


    • Effectively maintain and update all our know-how and models, so as to avoid repeating the same work over and over again, and develop only what needs to be developed in the often specific circumstances of the assignments entrusted to us .
    • Work with our customers in a secure, confidential and dematerialized way (link to the security page of the legalProd website) by sharing and exchanging all types of documents, while remaining in contact with our customers via a dedicated dematerialized space where they can retrieve all the documents in their file at any time.

      Our offers

      Growth companies
      SME and ETI
      Large groups

      Our rankings

      Altertax law firm admitted to the Paris Bar

      Altertax Avocats is a Paris-based tax law firm specializing in strategic tax advice for a variety of clients, including individuals, start-ups, SMEs and large corporations. Our expertise extends to tax structuring of M&A transactions, management of international flows, and tax auditing. We offer
      customized tax services
      backed by extensive regulatory monitoring and documentation.

      Altertax responds to their customers' complex tax challenges.

      Take an in-depth look at our various services as tax lawyers

      Our tax law firm offers specialized advice and litigation representation for individuals and businesses. We focus on strategic tax planning, dispute resolution and cross-border transactions, ensuring optimal tax compliance and efficient management of your tax issues. Here are some examples of the specific services we provide as tax lawyers:


      Tax lawyer

      As a specialisttaxlawyer, we offer in-depth legal advice to effectively manage your tax obligations and entitlements. Our expertise extends to all aspects of taxation, ensuring a comprehensive approach for both individuals and businesses.

      Tax advice

      We offer strategic tax advice, aimed at optimizing your tax situation while complying with current regulations. Our aim is to help you navigate the complex tax landscape with confidence and clarity.

      Tax audit lawyer

      Asatax audit lawyer, our team offers expert representation to defend your interests. We intervene at every stage of the process to minimize the risks and potential impact on your financial situation.

      International tax lawyer

      Our expertise asinternationaltax lawyers can help you manage the tax challenges associated with cross-border operations. We provide legal advice on how to effectively navigate multiple and complex tax regulations.

      Tax litigation lawyer

      As analawyer specializing in tax litigation, we represent and defend your interests in tax disputes. Our approach is aimed at resolving disputes with the tax authorities effectively, with priority given to amicable solutions or representation before the courts.

      Wealth lawyer

      We offer specialized legal expertise in wealth management, with a particular focus on real estate taxation. We help our customers optimize the tax impact of their real estate assets, whether for management, acquisition or transfer.

      FAQ tax lawyer

      Here are some frequently asked questions about the services of a tax lawyer:

      What areas of expertise does a tax lawyer cover?

      A tax lawyer specializes in a number of areas, including tax planning, tax dispute resolution, tax compliance, and tax issues related to commercial and personal transactions.

      How can a tax lawyer help my company?

      A tax lawyer can help your company by offering strategic advice on minimizing tax burdens, ensuring compliance with tax laws, and representing the company in disputes with tax authorities.

      What's the difference between a tax lawyer and an accountant?

      A tax lawyer concentrates on tax law and legal representation, while an accountant mainly handles the preparation of tax returns and bookkeeping.

      Can I consult a tax lawyer for personal tax matters?

      Yes, tax lawyers also provide advisory and tax planning services for individual clients, helping to manage personal and family tax issues. As is the case with AlterTax.

      How much does a consultation with a tax lawyer cost?

      Fees may vary depending on the complexity of the case and the lawyer's experience. It is advisable to discuss fees during the initial consultation.

      Does your Paris 17 office offer services in other arrondissements?

      Although our firm is established and located in Paris 17, we provide our tax lawyer services in all the arrondissements of Paris, such as Paris 7, Paris 8, Paris 16 and others. We are dedicated to helping our customers throughout Paris, offering them tax expertise tailored to their specific needs, regardless of their location in the capital.

      How does a tax lawyer assist with taxes and foreign investments?

      As masters in tax law, we support companies and individuals in the management of their assets and business affairs. Our practice covers everything from tax optimization to overseas investments, ensuring compliance and preventing tax evasion. Our expertise extends to capital issues and the needs of companies in various commercial fields.

      Can tax lawyers work in other regions or countries?

      As tax lawyers, we can intervene with the tax authorities and the administrative courts without geographical constraints in most tax disputes. We also act for foreign administrations, whether to plead, advise or represent our clients in any city or country.

      Your tax lawyer in France, Paris and abroad

      AlterTax, based in Paris, is your trusted partner for all your French and international tax issues. Our expertise stretches from the capital to the four corners of the country and crosses borders, offering comprehensive tax assistance tailored to your needs, whether you're based in the Paris region, Normandy, or beyond France's borders.

      It's good to be informed, but it's even better to be accompanied by an expert tax lawyer.

      Let's get in touch.