Succession and Estate Planning 2026

SWITZERLAND Law and Practice Contributed by: Olivier Sigg and Quentin Thorens, Walder Wyss

Walder Wyss is one of Switzerland’s leading law firms, with over 300 legal experts based in offices across Zurich, Geneva, Basel, Bern, Lausanne and Lugano. The firm offers comprehensive legal services across all areas of Swiss law, advising national and interna- tional businesses as well as private individuals. Its Private Client team supports Swiss and international private clients, entrepreneurs and family businesses with every aspect of succession and estate planning, as well as inheritance disputes. This includes cross- border inheritance structuring, matrimonial property

arrangements, family governance, the establishment of trusts and foundations, and tax-efficient wealth transfer. Combining in-depth expertise in private cli- ent, tax, corporate and dispute resolution matters, Walder Wyss is well placed to handle the most com- plex and multi-jurisdictional estates and family busi- ness successions. The lawyers’ integrated approach enables them to provide tailor-made solutions adapt- ed to their clients’ specific needs, guaranteeing them comprehensive support and reliable advice in all situ- ations.

Authors

Olivier Sigg is a partner in Walder Wyss’s Private Client team and heads the firm’s Geneva office. He is known, both in Geneva and in London, as an expert in complex cross-border matters and is regularly instructed by

Quentin Thorens is a senior associate in Walder Wyss’s Private Client team in Geneva and specialises in succession and estate planning, as well as in inheritance disputes. Quentin Thorens gained Bachelor’s

foreign lawyers, in particular from common law jurisdictions. Olivier Sigg’s private client practice includes various estate-planning techniques. In particular, as a TEP expert, he specialises in trusts, foundations, last wills and testaments. He provides advice to international high net worth individuals on estate planning, asset protection, relocation and philanthropy. His private client practice involves international succession litigation and trust disputes.

and Master’s degrees from the Universities of Fribourg and Vienna, was then admitted to the Geneva Bar, and obtained an LLM from New York University. His practice is now primarily dedicated to contentious inheritance matters. He advises and represents numerous clients in disputes involving testamentary provisions, including challenges to wills, annulment proceedings, abatement actions and the division of estates.

Walder Wyss Ltd 14 Rue du Rhône 1211 Geneva 3 Switzerland

Tel: +41 58 658 30 00 Fax: +41 58 658 59 59 Email: reception@walderwyss.com Web: walderwyss.ch

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