Frank Hirth




Customer types




Frank Hirth

FRANK HIRTH (FH) is the largest tax practice in the UK to specialise in both US and UK tax. Our offering makes us unique in the industry, and our truly bespoke tax advisory service sets us apart from our competitors. The firm was established in 1975 to support US and UK businesses expanding overseas, as well as expatriates and non-residents of both countries, to understand and comply with their dual tax obligations while minimising taxes. It is now clearly established as being the largest private client US/UK tax advisory firm.

We have flourished over the past 40 plus years, guided by our passion for building lasting relationships with our clients based on trust, understanding and technical excellence. We are now currently listed as the 31st largest accountancy firm in the UK with offices in London and Wellington (New Zealand).


• Bringing US and/or UK taxes up to date

• Doing business in the US or the UK

• Estate and inheritance tax planning

• Foreign Account Tax Compliance Act (FATCA) and withholding taxes

• Matrimonial tax planning

• Owner-managed, and privately owned businesses

• Full tax compliance and consultancy services

• Philanthropy and cross-border charitable giving

• Private equity and hedge funds

• Tax advisory and compliance

• UK tax planning for non-domiciles

• US expatriation

Within those areas, Frank Hirth provides compliance services, tax planning and advice on tax structures.

Our service is bespoke, targeted and efficient for every client’s situation, whether they are a private individual, a multi-national corporation or an owner-managed business looking for advice across their business and personal finances. Increasing global scrutiny of tax arrangements and frequent changes to tax rules in the UK and the US mean that over the past few years we have seen a surge in demand for our services.

We have always been a tax-led business. Our offices operate as a single business with integrated teams split across all locations, reflecting the international profile of many of our clients. This structure differentiates us from the vast majority of our competitors, and we believe it helps support our philosophy of providing the best possible service to our clients.

Our integrated teams of highly trained professionals in London and Wellington are committed to offering our clients their expertise and insight to guide them through the dense labyrinth of regulations across borders.

We will work with clients to examine the whole picture, from personal circumstances to any relevant business relationships, in order to properly identify any potential problems and ultimately provide them with a bespoke, meaningful and efficient solution.

More specifically, our tax specialists are well equipped to handle the arising complexities from the changing tax rules for non-domiciles in the UK and the strict offshore compliance requirements for US taxpayers.

Our approach to service delivery is based on technical expertise combined with a personal service. We are able to achieve this through our deep specialisation in cross-border tax issues, our wealth of international tax expertise and our commitment to the highest standard of technical training.

The structure and size of our business also enables us to give clients access to our most senior partners, directors and managers for a fraction of the cost of the larger international firms.

1. We work across departments and with our clients’ other professional advisers to offer a smooth and joined-up service, always putting the client first.

2. Tax has been our business for over 40 years, with clarity, transparency and friendliness being watchwords in how we conduct our business.


US and UK Tax compliance; Private client advisory


United Kingdom


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