Practice Areas
- International and European Tax Law
- Domestic Luxembourg Taxation
- Tax planning and restructuring
- Corporate
- Private Equity
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Education and Professional Experience
- Lawyer, admitted to the Bar in Luxembourg (2020)
- University of Saarbrücken and University of Metz, Bachelor in German and French law
- University of Metz, Master in cross-border Business law
- University of Trier, LL.M. in German law with an emphasis in International and European Tax law
- Traineeship at a law firm and an advisory firm in the area of International Tax law
- Traineeship at the High Court of Justice of Saarbrücken
Languages
- English, French, German
Memberships
- Luxembourg branch of the International Fiscal Association (IFA)
Publications
- Ostertag, M. and Kleinschmidt, A. (2024). Luxembourg: The Chambers Global Practice Guide – Tax Controversy 2024, London: Chambers and Partners, pp. 2-25.
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2023). Luxembourg: The Legal 500 Country Comparative Guide – Luxembourg: Tax, 8th ed. London: Legallease, pp. 2-14.
- Ostertag, M. and Kleinschmidt, A. (2022). Luxembourg: The Chambers Global Practice Guide – Tax Controversy 2023, London: Chambers and Partners, pp. 5-24.
- Schumacher, C., Schiffmann, K., Kleinschmidt, A. and Schneider, S. (2023). Bill of Law: Modernising the Luxembourg Investment Funds Toolbox. GSK Update. Available at: https://www.gsk-lux.com/en/bill-of-law-modernising-the-luxembourg-investment-funds-toolbox/
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2022). Luxembourg:The Legal 500 Comparative Legal Guide – Luxembourg: Tax 2022, 7th ed. London: Legallease, pp. 2-13.
- Ostertag, M. and Kleinschmidt, A. (2022). Luxembourg: The Chambers Global Practice Guide – Tax Controversy 2022, London: Chambers and Partners, pp. 4-22.
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2021). Luxembourg: Tax. The Legal 500 Comparative Legal Guide, 6th ed. London: Legalease.
- Ostertag, M. and Kleinschmidt, A. (2021). Luxembourg: Chambers Global Practice Guide – Tax Controversy 2021, London: Chambers and Partners, pp. 4-17.
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2020). Implementation of DAC 6 into Luxembourg law: recent amendments to the draft bill. GSK Update. Available at: https://www.gsk-lux.com/en/implementation-of-dac-6-into-luxembourg-law-recent-amendments-to-the-draft-bill/
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2020). New tax measures in response to the COVID-19 state of emergency. GSK Update. Available at: https://www.gsk-lux.com/en/new-tax-measures-in-response-to-the-covid-19-state-of-emergency/
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2020). Updated: New tax measures in response to the COVID-19 state of emergency. GSK Update. Available at: https://www.gsk-lux.com/en/updated-new-tax-measures-in-response-to-the-covid-19-state-of-emergency/
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2020). Updated: Tax measures during the state of emergency. GSK Update. Available at: https://www.gsk-lux.com/en/updated-tax-measures-during-the-state-of-emergency/
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2020). Luxembourg: Tax. The Legal 500 Comparative Legal Guide, 5th ed. London: Legalease.
- Ostertag, M. and Kleinschmidt, A. (2019). First social security treaty signed between Luxembourg and China: what to expect? GSK Update. Available at: https://www.gsk-lux.com/en/gsk-update-first-social-security-treaty-signed-between-luxembourg-and-china-what-to-expect/
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2019). Bill implementing ATAD 2 in Luxembourg domestic law and 2020 budget law voted on 19 December 2019. GSK Update. Available at: https://www.gsk-lux.com/en/bill-implementing-atad-2-in-luxembourg-domestic-law-and-2020-budget-law-voted-on-19-december-2019/
- Ostertag, M., Schiffmann, K. and Kleinschmidt, A. (2019). Luxembourg: Tax. The Legal 500 & The In-House Lawyer Comparative Legal Guide, 4th ed. London: Legalease.