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Mark Summers

Partner

Mark advises on matters of cross border taxation and international estate planning.

mark-summers

About

Mark advises global wealthy families, their businesses and wealth holding structures, and the institutions that service them. He is most noted advising families resident or investing in multiple highly taxed and regulated jurisdictions such as the US, UK or EU where they are affected by complex multi-jurisdictional tax and legal issues.

Mark also advises on matters of UK taxation, particularly where there are cross border elements of relocation or wealth structuring.

Mark is admitted to practise in England and Wales and as a foreign lawyer to the EU list of the supervisory commission of lawyers for the canton of Zurich and the Swiss Federation. Mark is a member of the IBA and IFA. He is the vice-chair of the STEP Public Policy Committee and a member of the European advisory board to the Institute for Family Governance. He is a Swiss and UK citizen and resides with his family in the canton of Zug.

Experience

  • Advised and large and widely invested Italian-Swiss trust on regularisation where both the trustees and beneficiaries had unwittingly drifted into tax, reporting and regulatory non-compliance in multiple jurisdictions due to complexity of the cross-border rules to which they were subject.
  • Advised the trustees of a multi-billion dollar complex Caribbean trust structure on complex matters of cross-border taxation, trust law, family governance and financial services regulation arising from the family members’, family office’s and trust investments’ connections to multiple jurisdictions including the US, Germany and the UK.
  • Advised several UHNW UK resident business owners and investors on personal relocation options and restructuring of business and wealth holding structures as a result of the abolition of the remittance basis tax regime for “non-doms.”
  • Advised a Latin American global brand business owning family with family members resident in the UK and Spain on cross-border tax regularisation and compliant global wealth restructuring through Swiss and Luxembourg vehicles.
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Recognition

  • SummersMark-Chambers2025
  • Leaders_League_2025_RankedFirm
  • EMEA_Recommended_lawyer_2025
  • CHNW-2024-Mark-Summers
  • handelsblatt-best-lawyers
  • handelsblatt-lawyers-of-the-year
  • legal-500-emea-2024-rec-partner
  • best-lawyers-2024

Our thinking

  • IBA Annual Conference 2025

    Simon Ridpath

    Events

  • Taxing Times Ahead: The impact of the 2025 UK tax changes on trusts

    Alice Martin

    Insights

  • UK tax changes for non-doms, trusts and IHT. What do we know and when we will know more?

    Alice Martin

    Insights

  • New rules for non-doms: (Too) Short and Sweet?

    Alice Martin

    Insights

  • The statutory residence test

    Dominic Lawrance

    Insights

  • Split Year Treatment

    Dominic Lawrance

    Insights

  • Charles Russell Speechlys Swiss lawyers contribute to Private Wealth Chambers Global Practice Guide

    Michael Wells-Greco

    In The Press

  • How Private is Wealth?

    Mark Summers

    Insights

  • Midshore or Midtown? Changing trends in wealth structuring for Latin American clients

    Mark Summers

    Insights

  • Untangling the Atlantic Knot: Tax reporting and compliance for US citizens living in the UK

    Sangna Chauhan

    Podcasts

  • Untangling the Atlantic Knot: FATCA and information exchange [bonus episode]

    Sangna Chauhan

    Podcasts

  • Charles Russell Speechlys further expands its Swiss Private Client team with the hire of Dharshi Wijetunga as Partner

    Mark Summers

    News

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