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Peter Dempsey

International Private Client, Private Client Tax, International

Peter is a senior lawyer in our International department at Cubism Law. 

He advises UK and international individuals and families on asset protection, succession planning, UK and international taxation, and on the establishment and operation of trusts.

Peter is a senior lawyer who specialises in advising  individuals and families on complex, high value matters including multijurisdictional asset protection, succession planning, UK and international taxation, and on the establishment and operation of trusts.

He advises on succession and estate issues and helps families to avoid disagreements and represents parties if matters become contentious. Much of Peter’s work involves cross-border issues often where three or more jurisdictions are involved.

Most of Peter’s clients are of non-UK origin. They include individuals who utilise the UK’s non-domicile system of taxation and come from a range of professional arenas including private equity executives, art dealers, bankers, investors and other lawyers.

Originally from Ireland, Peter was tax partner at PwC and has worked abroad for over 25 years living in Brussels, Prague and London. He is often called upon to provide fly-in advice and expertise on matters across Europe and the USA.

Having spent over 20 years advising corporate clients, Peter became a Private Client lawyer in 2005,  focusing on advising individuals. He is passionate about helping individuals address complex financial and legal challenges and working across borders.

In 2013 whilst a member of a niche Private Client law firm, Peter made reports to the Police and the Solicitors Regulation Authority (SRA) concerning certain suspicions about the activities of another member of the same firm.

The individual in question subsequently sued Peter and the case went to the High Court in London.  The SRA intervened in the case believed to be the first time this had occurred. The solicitor whom Peter reported was prosecuted by the SRA before the Solicitors Disciplinary Tribunal (SDT), and in May 2018 at the conclusion of a lengthy trial, the SDT found the individual guilty of multiple counts of serious dishonesty and ordered that the individual be struck off the roll.

Peter comments on his experience: “I believe that a client should be able to trust their lawyer, but sadly I have been involved in a situation where I had to make a report and, having blown the whistle, retaliation came next. I am grateful to Cubism and my colleagues for their support during that time. Although the process took a long time, it is a relief to have been vindicated and to see the public protected from a dishonest solicitor.”

As well as being a Solicitor in England & Wales, Peter is a Barrister (Rep of Ireland) and a member of the Irish Tax Institute. In 2012 he was inscribed at the Paris Bar. He speaks French and German fluently and advises clients in those languages.


  • Tax
  • Private Client
  • Wills
  • Trusts
  • Probate
  • Tax and legal advice in numerous domestic and cross-border corporate structuring and restructurings
  • Advice to families on challenges to Wills both on the Claimant and Defendant side
  • Specialises in long-term asset and tax planning for wealthy families and individuals
  • 2013 to date Cubism Law
  • 2005 Qualified Solicitor in England & Wales (Advising Private Clients)
  • 1982 Tax & Legal, PwC Dublin (Advising corporate clients) became a partner in 1989
  • 1981 Tutor in the Law Faculty
  • 1981 Graduated in law from University College Dublin
  • Barrister (Republic of Ireland)
  • Solicitor (England & Wales)
  • Member of the Irish Tax Institute
  • Inscribed at the Paris Bar