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As an American citizen myself, I completely understand the stresses and complexities of engaging with the US tax system. That’s why I chose to specialise as a US tax accountant, to remove some of the worry for other American citizens in the UK.

Catherine is Warrener Stewart’s US Tax Manager, responsible for completing and filing clients’ US and UK tax returns, as well as advising partner accountancy firms.

Catherine moved to the UK during the final year of her International Relations degree at Richmond, The American International University in London. After graduating she worked at a global mobility and relocation agency, Saunders 1865, helping employees to relocate internationally for their jobs.

When she saw a US/UK tax trainee role at Warrener Stewart she applied straight away, knowing the impact being a US citizen in the UK can have on personal finances. Today Catherine works with companies and other accountancy practices, advising them on specific UK and US tax situations and helping them understand their obligations to ensure they are as tax efficient and compliant as possible.As well as corporate clients, Catherine also works with private individuals, many of whom have no technical US tax expertise. Their needs range from assisting individuals with the tax considerations of joint property ownership, to helping company directors understand the tax treatment of their shareholdings, then reviewing their company structure is tax efficient across the UK and US tax systems.

Since starting work at Warrener Stewart in 2016 and qualifying as an Enrolled Agent, Catherine’s found the most rewarding part of her job is helping her clients. Accounting for tax can be stressful, yet she enjoys helping to calm people’s nerves and assuring her clients through each step of the process.


“For the past 20 years Warrener Stewart has consistently given good advice... going above and beyond their remit.”
Theo Brehony - London Preparatory School Limited