• Practice Areas
  • Sectors
  • Lawyers
  • Notaries

Mathilde Ostertag
+352 2718 0200

Profession and Position

  • Lawyer, admitted to the Bar in Luxembourg (2008)
  • Avocat à la Cour
  • Local Partner GSK Luxembourg SA

Special Qualifications

  • Licensed specialist for Tax Law (Certificat d’études spécialisées en Droit et fiscalité du commerce international)

Practice Areas

  • Tax, Corporate Tax
  • International Tax Planning
  • Private Equity, Foreign Investments
  • Real Estate
  • Intellectual Property Transactions

Education and Professional Experience

  • Université Robert Schuman, Strasbourg (France) and Freie Universität, Berlin
  • Master’s degree and post graduate degree in corporate and tax law, tax specialisation (DJCE)
  • Practiced within a Benelux and an international law firm in Luxembourg for the past nine years


  • French, English, German, Portuguese


  • Young International Fiscal Association (Young IFA)
  • International Fiscal Association (IFA)


  • Chmiel, Katarzyna und Ostertag, Mathilde: Chapter Luxembourg, in: Comparative Legal Guide to Corporate Tax and Regulations 2019, 163-170. 
  • Ostertag, Mathilde: Le ruling TVA: enjeux et perspective, Ed° Les Collégiales du droit, 2015