Oliver Marre

Spear’s Review

Oliver Marre is a junior barrister at 5 Stone Buildings who acts in all areas of contentious and non-contentious tax law.

In addition to litigating in private client tax disputes with HMRC, Marre advises individuals, owner-managed businesses and corporates on everything from domicile and residence to cross-border asset transfers.

He is also experienced in family law work and the tax issues that arise in high-value divorces, having litigated several such cases in the High Court. ‘When a very rich person is divorcing another very rich person, they’ve normally got quite complex tax structuring in the background,’ he tells Spear’s. ‘So, the question for me is, if splitting the assets, how is that split taxed?’

Government changes to the non-dom regime are among the biggest concerns for Marre’s clients. ‘I don’t think I’ve ever been busier than I was between October 2024 and July 2025. Almost all of my clients wanted advice on how to leave the country tax efficiently; or, if they stayed, what they could do to minimise things.’