Band 4
Provided by Mathilde Ostertag
Mathilde Ostertag is a partner at AKD who specialises in tax matters, with a strong track record advising on the tax and legal aspects of structured finance, securitisation, capital market transactions, and investment fund structuring in Luxembourg. Her clients include global fund managers, financial institutions, corporates, and private equity investors.
She has significant experience handling domestic and international tax planning, SME M&A deals, corporate reorganisations and ESOPs.
Mathilde is known for her practical, client-driven approach to complex tax structuring and regulatory advice.
Key Recognitions:
Chambers Europe 2025: Band 4 – Tax (Luxembourg)
ITR World Tax: Highly Regarded Practitioner (2024–2025)
IFLR1000: Notable Practitioner (2023–2024)
Legal 500 EMEA: Recommended Lawyer in Tax (2023–2024)
She is a member of the Luxembourg Bar and speaks English, French, German and Portuguese.
Young International Fiscal Association (Young IFA)
International Fiscal Association (IFA)
International Bar Association (IBA)
President of the Ladies in Law Luxembourg Association (LILLA)
Ostertag, M. and Schiffmann, K. (2021) Luxembourg. The International Comparative Legal Guide to Corporate Tax 2022, 18th ed. London: Global Legal Group, Chapter 13, pp. 106-116.
Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2021). Luxembourg: Tax. The Legal 500 Comparative Legal Guide, 6th ed. London: Legalease.
Provided by Chambers
Mathilde Ostertag predominantly advises on the tax aspects of cross-border transactions, with notable strength in fund structuring and acquisitions. She joined AKD in October 2025 after having previously worked at GSK Stockmann.
Provided by Chambers
Mathilde is very knowledgeable of many different legal and tax aspects and is friendly to work with.
Mathilde Ostertag provides a great level of service and we appreciate her strong technical knowledge.
Mathilde Ostertag provides excellent service.
Mathilde is very knowledgeable of many different legal and tax aspects and is friendly to work with.
Mathilde Ostertag provides a great level of service and we appreciate her strong technical knowledge.
Mathilde Ostertag provides excellent service.