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Olivier Thevoz

Founding Partner

US and International Tax Attorney-at-law
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Olivier Thevoz is an attorney specializing in U.S. and international tax law, licensed to practice in New York, Texas, and Switzerland. As the founding partner of THEVOZ & Partners, a law firm with offices in Switzerland (Lausanne) and the United States (New York, Austin, TX, and Honolulu), he advises prominent European families and international groups on structuring and securing their investments in the United States.

His areas of expertise include:

  • International tax planning (for corporations, individuals, and trusts)
  • Transatlantic tax matters (residency, compliance, inheritance and wealth transfer)
  • Tax audits, litigation, and administrative proceedings
  • Structuring high-value cross-border investments and transactions
  • He also serves as a strategic legal and tax advisor to financial institutions, providing an integrated perspective on governance and international expansion. In addition, he is an active member of the Committee on Civil Practice Law and Rules of the New York Bar Association and the Committee on Tax of the Vaud Bar Association.

    As founder of THEVOZ & Partners, and with offices strategically located in Switzerland and the United States, Attorney Thevoz provides legal solutions to local clients who live and work in a global financial market.

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    • LL.M., Business Law, University of Texas School of Law (2021)
    • Master of Law in Private Estate and Tax Law Litigation - summa cum laude (University of Lausanne, 2011)
    • Bachelor of Law, University of Lausanne (2009)
    • Federal Certification as Accounts Expert, (Accounting and Tax Expert) (2006)
    • Federal Certification as Accountant Agent (2003)

  • US tax law
  • International tax law
  • Trust and estate planning
  • New York
  • Texas
  • United States Tax Court
  • Switzerland (all courts)
  • New York (2023)
  • Texas (2021)
  • Switzerland (2013)
  • English
  • French
  • Member, New York City Bar Association (2026 - present)
  • Member, Swiss-American Chamber of Commerce (2026 - present)
  • Member, New York Bar Association (2023 - present)
  • Member, Texas Bar Association (2021 - present)
  • Member, American Bar Association (2018 - present)
  • Member, Vaud Bar Association (2013 - present)
  • Member, Swiss Attorneys Federation (2013 - present)
  • Member, International Fiscal Association (IFA) (2011 - present)
  • 2022

  • US Tax Implications for Swiss Residents Investing in US Stocks, Expert Focus 2022/10, p. 477 ss.
  • §1782(a) – Obtention des moyens de preuve aux Etats-Unis (“§1782(a) – Obtaining evidence in the United States”) Revue de l’Avocat FSA (Swiss Bar Association) 6/7 2022, p. 285 ss.
  • 2019

  • Analyse des défit pour la Suisse au regard du droit fiscal international. Les futurs défis qui attend la Suisse après l’adoption de sa réforme fiscale de 2019 (Analysis of the challenges for Switzerland regarding international tax law. The future challenges for Switzerland after the adoption of 2019 tax reform), Expert Focus 2019/11, p. 885 ss..
  • 2018

  • Baisse d’impôts, un cadeau empoisonné pour les actionnaires américains? (Reduction of taxes, a poisoned gift for US shareholders?), Journal Le Temps, November 19, 2018.
  • Règles professionnelles applicables aux activités atypiques (Professional regulations on atypical activities), Revue de l’Avocat FSA (Swiss Bar Association) 10/18, p. 450 ss.
  • 2016

  • Transparence des personnes morales et publicité des participations. Conséquences pratiques liées aux obligations d’annonce des actionnaires (Transparency of legal entities and publicity of shareholdings. Practical consequences of shareholder reporting obligations), Expert Focus 2016/8, p. 574 ss.
  • “OpenLux: un scandale fiscal de plus?” (“OpenLux: one more tax scandal”), Interview on Bilan (February 22, 2021)

    “Mieux vaut payer ses impôts en avance plutôt qu’en retard” (“Better to pay the taxes in advance than late”), Interview on Radio Suisse Romande (RSR) (April 6, 2016)

    October 9, 2020 Lector and organizer of the seminar at Royal Savoy, in Lausanne (CH) “Evolution de la fiscalité internationale : Conséquences pratiques en Suisse”

    Translation: “Evolution of international taxation: Practical consequences in Switzerland”

    November 15, 2019 Lector of the seminar at Capital Factory, in Austin (TX) “Digital data and how to build a business in the U.S.”

    May 9, 2019 Lector of the seminar at Austin Board of REALTORS Headquarters, in Austin (TX) “Planning the Sale Before the Purchase”

    June 11, 2018 Lector and organizer of the seminar at Espace CDPQ, in Montreal (CAN) “La Suisse : Championne mondiale de l’innovation et de la compétitivité”

    Translation: “Switzerland: World champion of innovation and competitivity”

    May 8, 2017 Lector and organizer of the seminar at Hôtel Métropole, in Geneva (CH) “Effects of the Tax Treaty between the U.S. and Switzerland”

    April 6, 2017 Lector and organizer of the seminar at the Swiss General Consulate, in Montreal (CAN) “La Suisse, une fiscalité attractive ? Quels sont les grands pièges à éviter ? Comment créer sa société en Suisse ?”

    Translation: “Switzerland, an attractive tax system? What are the big pitfalls to avoid? How to create your company in Switzerland?”

    December 2, 2016 Lector of the seminar at Hôtel Aquatis, in Lausanne (CH) “Responsabilité pénale des mandataires. Les nouvelles obligations d’annonce pour les actionnaires et associés de sociétés suisses”

    Translation: “Criminal liability of agents. The new announcement obligations for shareholders and partners of Swiss companies”

    October 4, 2016 Lector of the seminar at Beau-Rivage Palace, in Lausanne (CH) “Impôts sur les successions et donations dans le canton de Vaud”

    Translation: “Inheritance and gift taxes in the canton of Vaud”

    June 3, 2016 Lector and co-organizer of the seminar at Hôtel de la Paix, in Lausanne (CH)

    June 2, 2016 Lector and co-organizer of the seminar at Hôtel Mandarin Oriental, in Geneva (CH) “Le client, votre meilleur ennemi : comment pallier les risques de responsabilité ?”

    Translation: “The client, your best enemy: how to mitigate liability risks?”

    April 28, 2016 Lector and co-organizer of the seminar at Hôtel de la Paix, in Lausanne (CH)

    April 27, 2017 Lector and co-organizer of the seminar at Swissôtel Métropole, in Genève (CH) “Responsabilité pénale fiscale des mandataires et des administrateurs des sociétés offshore”

    Translation: “Criminal tax liability of the professional consultants and the directors of offshore companies”

    Novembre 12, 2015 Lector and co-organizer of the seminar at Swisshôtel Métropole, in Geneva (CH)

    November 10, 2015 Lector and co-organizer of the seminar at Hôtel de la Paix, in Lausanne (CH) “Secret bancaire et échange automatique d’information”

    Translation: “Banking secrecy and automatic exchange of information”

    October 6, 2015 Lector of the seminar in Aubonne (CH) “Fiscalité – L’imposition des prestations de retraite”

    Translation: “Taxation of pension benefits”

    October 2, 2014 Lector and co-organizer of the seminar at Hôtel Beau-Rivage Palace, in Lausanne (CH) “Nouveautés dans les relations fiscales franco-suisses”

    Translation: “Developments in Franco-Swiss tax relations”

    May 13, 2009 Lector and organizer of the seminar in Lausanne (CH) “La nouvelle loi fédérale sur la simplification du rappel d’impôt en cas de succession et sur l’introduction de la dénonciation spontanée non punissable ; La nouvelle loi portant modification de la procédure de rappel d’impôt et de la procédure pénale sur la soustraction d’impôt d’imposition directe ; L’évolution de la jurisprudence en matière de soustraction fiscale.”

    Translation: “The new federal law on the simplification of the additional tax assessments for inheritance and on the introduction of non-punishable spontaneous denunciation; The new law amending the tax assessments procedure and the criminal procedure on the direct tax evasion; The evolution of the jurisprudence on tax evasion.”

    April 23, 2008 Lector and co-organizer of the seminar at Casino de Morges, in Morges (CH) “La nouvelle loi sur la réforme de l'imposition des entreprises II et ses implications pratiques”

    Translation: “The new law on corporate tax reform II and its practical implications”

    January 18, 2007 Lector of the seminar at Centre Patronal, in Paudex (CH) “Présentation de l’art. 321 code pénal et du nouveau droit de la Sàrl”

    Translation: “Presentation of the art. 321 of the criminal law and the new law of the LLC”

    October 4, 2006 Lector of the seminar at Refuge de Bussigny, in Bussigny (CH) “Le réviseur et ses obligations s’il constate des violations de la loi lors de ses travaux d’audit et les moyens de pressions par la justice sur les réviseurs”

    Translation: “The auditor and his duties if he discovers violations of the law during his audit work and the ways to pressure justice on the auditors”

    January 18, 2006 Lector of the seminar at Centre de formation du Domaine de Greybin, in Molondin (CH) “LFus – nouveautés”

    Translation: “Mergers Act – development”

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