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Mark Summers, Partner

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

Mark Summers, Partner

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Private Client


Mark advises wealthy individuals and family offices as well as the private banks and fiduciaries that service them. He is expert in structuring clients’ affairs where they are affected by complex multi-jurisdictional tax and legal issues. He is particularly noted for innovative solutions for clients with US or European connections. Mark is also expert on matters of UK taxation as it relates to individuals and their wealth holding structures.

He regularly advises on the remittance basis of taxation for non-domiciliaries, matters of UK tax residency and the taxation of UK real estate. He also advises on the regularisation of untaxed assets particularly where there is a multi-jurisdictional dimension. Mark is a member of STEP, the IBA and the ITPA and is a member of the STEP Zurich branch committee.

"He's a fantastic lawyer, he's the go-to for everyone - including me - for a problem with UK trusts" Chambers HNW, 2018, Private Wealth Law

"Mark advises on UK law, but what makes him special is that he knows the situation from a Swiss point of view, people like him are really rare." Chambers HNW, 2016

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.

Experience highlights

  • Advised a European family office on a complete resettlement of a $ billion structure comprising operating businesses, real estate, aircraft and portfolio investments; the solution involved resettling assets via the unmarried next generation who were all resident and addressed issues of wealth protection, succession and taxation
  • Advised a US family office on acquisition and tax efficient structuring of residential and commercial real estate in the UK where the development and renovation of the property was largely at the instigation of a UK resident family member
  • Advised on US/UK tax implications for beneficiaries of US trusts resident in the UK and advising US persons resident in the UK on tax efficient estate planning for both jurisdictions
  • Advised a leading Swiss private bank on implementing a new investment platform for UK resident non-domiciled clients and provided training for its staff