Yaël Sion LAWYERS & ASSOCIATES advises businesses, executives, and individuals on tax and customs law, litigation, and more broadly, high-stakes situations where legal strategy makes all the difference. Based in Marseille, the firm also provides remote services and travels throughout France, depending on the needs of the case.

Maître Yaël Sion, Attorney-at-Law (Marseille Bar)

Maître Yaël Sion is a lawyer, member of the Marseille Bar and founder of Yaël Sion LAWYERS & ASSOCIATES (2015). She is also a lecturer in corporate taxation. Her practice focuses on tax and customs law, tax audits and litigation, distressed companies, and support in administrative law.

An independent law firm, fully focused on your case

The firm is guided by a simple conviction: effective legal support is built on independence, clarity, and responsiveness. Ms. Sion personally oversees all matters entrusted to the firm, ensuring tailored follow-up, a thorough understanding of your situation, and direct communication whenever needed.

Our role is also to make complex issues clear and accessible: helping you understand the situation, make informed decisions, and move forward with a coherent strategy—without unnecessary complexity or superfluous detail.

Our method

Throughout the proceedings, you are kept informed of every key stage: exchanges with the opposing party, responses, explanations, and hearing preparation. If you wish, you may attend the hearing, with prior guidance to ensure you approach this step under the best possible conditions.

Advise

Understanding your situation and building a strategy. The advisory phase begins with what matters most: listening, reviewing your documents, and asking the right questions to quickly identify the legally decisive issues. The objective is to define realistic courses of action and present them to you clearly, taking into account your specific context—not a generic answer found online.

Secure

The firm can also act at an early stage to secure a decision, mediate, draft a deed, contract, or settlement agreement, or assist you in negotiations when you wish to pursue an amicable resolution.

Defend

When an amicable resolution is not possible, or not appropriate, the firm represents you before the competent courts. The approach is based on a strategy developed with you: clarifying the issues at stake, closely monitoring deadlines, selecting the most relevant arguments, and validating all pleadings (petitions or summons) prior to filing.

Marseille office and remote support

The firm is based in Marseille and works by appointment. Remote support can also be organised when appropriate (phone / video conference), with the same standards of follow-up and confidentiality.

Address: 565, avenue du Prado – 13008 Marseille

Get in touch

If you want to briefly present your situation and understand your options, please contact the firm. A first exchange helps clarify your legal position and the most relevant approach.