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Junior Associate

Margaux Cauchie

Languages
  • French
  • Dutch
  • English
Social media

Margaux advises clients on tax law matters, particularly in the area of tax litigation. She assists listed companies and SMEs in tax disputes, both at the administrative and judicial stages, notably in complex cases involving issues of principle, procedural challenges and detailed factual analyses.

Margaux was sworn in at the Brussels Bar in October 2023. She has two years’ experience assisting clients in dealings with the tax authorities and handling tax litigation matters.

She holds a Bachelor’s degree in Law from Saint-Louis University Brussels and pursued her studies at the Université catholique de Louvain, where she obtained a Master’s degree in Law with a major in civil and criminal law and a minor in tax law. To further develop her expertise in tax matters, she completed an Advanced Master’s degree in Tax Law at the Université libre de Bruxelles.

Margaux is a native French speaker, is fluent in Dutch and has a good command of English.

She joined CMS Belgium in April 2026 as part of the Tax team.

Relevant experience

  • Management and follow-up of large-scale tax litigation, involving significant procedural and organisational challenges. 
  • Assisting clients during tax audits and proceedings with the tax authorities. 
  • Supporting clients in the context of (Vendor) Due Diligence processes, in particular on tax-related aspects.

Publications

  • G. GALEA, S. HARDY, M. CAUCHIE, “La déclaration pays-par-pays devient (partiellement) publique”, Actualités fiscales, n°2024/40, week of 16 December to 22 December 2024.
  • G. GALEA, S. HARDY, M. CAUCHIE, “Pilier II : extension des délais de notification”, Actualités fiscales, n°2024/27week of  9 September to 15 September 2024.
  • G. GALEA, C. GUERY, M. CAUCHIE, “Paiements et transferts d'actifs vers des paradis fiscaux : une prétendue conformité à la jurisprudence européenne”, Actualités fiscales, n°2024/12week of 1 March 2024.
  • G. GALEA, C. GUERY, M. CAUCHIE, “Harmonisation des procédures de dégrèvement de retenue à la source : proposition de Directive « FASTER »”, Actualités fiscales, n° 2024/11, week of 25 to 31 March 2024. 
  • G. GALEA, C. GUERY, M. CAUCHIE, “Simplification fiscale pour certaines PME européennes : proposition de Directive « HOT »”, Actualités fiscales, n° 2023/38, week of 27 November to 3 December 2023
  • G. GALEA, M., CAUCHIE, “Circulaire 2022/C/86 : déductibilité de certains frais professionnels”, Actualités fiscales, n° 2022/35, week of 31 October to 6 November 2022.

Lectures list

  • September 2025 - Speaker at Infotopics, “Les déductions fiscales des frais”, Brussels 
  • June 2024 - Speaker at Infotopics, “Les déductions fiscales : sujets choisis”, Nivelles

Education

  • 2023 - Bar admission (Brussels, Belgium)
  • 2023 - Université Libre de Bruxelles, ULB - Belgium (Advanced Master’s Degree in Tax Law) 
  • 2022 - Université de Louvain, UCLouvain - Belgium (Master’s Degree in Law)
  • 2020 - Université de Saint-Louis de Bruxelles - Belgium (Bachelor’s Degree in Law)
Practice Areas

Insights by Margaux

CMS Belgium accelerates its Tax practice with the arrival of Geoffroy Galéa and his team

01 Apr 2026 2 min read
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