Sebastiaan is specialized in Dutch and international tax matters with a focus on US multinationals active in the energy and tech sectors. He has broad experience in advising clients on cross-border restructurings, M&A, financing and holding structures and other corporate tax related matters. Sebastiaan also frequently advises on EU and OECD tax developments, including Pillar 2. He is a member of our Participation exemption knowledge group.

Sebastiaan is a member of our US region team. In 2023, he was seconded to a large international American law firm in their offices in Boston, Silicon Valley and San Francisco where he advised US clients on their European matters.

Expertises
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Memberships

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Dutch Association of Tax Advisers (NOB)
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American Bar Association (ABA)
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International Fiscal Association (IFA)
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Qualifications

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US International Taxation, International Tax Center Leiden, 2022
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US Corporate Taxation, International Tax Center Leiden, 2022
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MSc Fiscal Economics, Erasmus University Rotterdam, 2019 (cum laude)
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BSc Fiscal Economics, Erasmus University Rotterdam, 2017 (cum laude)
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Publications

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Claessen, S.C.A., & Tijl, S.A. (2022). Enkele knelpunten bij liquidatieverliezen in tussenhoudstersituaties. Weekblad Fiscaal Recht 2022/207, 1310-1317.

Sebastiaan Claessen

Senior Associate - Tax Adviser

sebastiaan.claessen@loyensloeff.com

New York

Dutch, English

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<p>Sebastiaan Claessen, tax adviser, is a member of the International Tax Services team. Sebastiaan is seconded to our New York office for the period April 2023 - May 2024.</p>

Sebastiaan is specialized in Dutch and international tax matters with a focus on US multinationals active in the energy and tech sectors. He has broad experience in advising clients on cross-border restructurings, M&A, financing and holding structures and other corporate tax related matters. Sebastiaan also frequently advises on EU and OECD tax developments, including Pillar 2. He is a member of our Participation exemption knowledge group.

Sebastiaan is a member of our US region team. In 2023, he was seconded to a large international American law firm in their offices in Boston, Silicon Valley and San Francisco where he advised US clients on their European matters.