Contentious Tax | Fieldfisher
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Why choose our Contentious Tax team?

We have deep understanding and experience of all of the circumstances in which companies and individuals may find themselves in disagreement about their tax position with tax authorities or with previous professional advisers. We are described in Legal 500 as having 'total domain expertise'. That expertise spans tax disclosures, enquiries, lobbying, ADR, litigation before the First -tier Tribunal (Tax), Upper Tribunal (Tax and Chancery Chamber), in the High Court and Court of Appeal, in Judicial Reviews, in restitution and rectification claims, in litigation before the EU courts, and in professional negligence claims.

The vast majority of contentious tax matters on which we are instructed settle, often on advantageous terms for our clients. Where settlement cannot be achieved, we litigate and have an excellent record of success.

We have considerable expertise in advising on cross-border tax issues, particularly in the EU, and have had conduct of many references to the CJEU. We are multi-lingual, advising in English, French, German, Polish and Romanian. In conjunction with our network of European offices, we also advise clients on tax matters in Belgium, France, Germany, Italy, Luxembourg and Spain.

We have grown to become one of the largest teams of lawyers advising exclusively on contentious tax of any UK law firm. We are consistently highly-ranked in Chambers and Legal 500. Clients praise us for our knowledge of HMRC's procedures and processes, our technical expertise and our understanding of our clients' drivers. 

We also offer a range of funding options for contentious tax clients, including fixed fees and contingent arrangements.


Notable Deals
Sunrise Medical Limited & Electric Mobility Limited v HMRC
Fieldfisher won the first round of litigation on the customs classification of mobility scooters in November 2020. The decision was that scooters are 'carriages for the disabled' and liable for customs duty at 0%. That litigation involved the FTT, CJEU, Upper Tribunal, Court of Appeal and Supreme Court. HMRC then said that an EU regulation means that mobility scooters imported more recently attract higher customs duty. In July 2024, the FTT allowed the claimants' appeal against HMRC's exaction of customs duty in this regard.
Exchequer Solutions Limited v HMRC
UT decision in January 2024 - this is the leading case in a current wave of litigation on the tax treatment of expenses by umbrella companies. Umbrella companies employ very large numbers of temporary workers across construction, transport and hospitality. Involving thousands of workers as part of the underlying fact-pattern, this appeal involved a key issue of principle in employment tax disputes: what level of employer obligation creates an overarching contract of employment? Commercially, this has significant bearing on the temporary work sector.
The Eclipse Settlement Opportunity
Announced in September 2021, eight years of persistent hard work and innovation by the Fieldfisher team caused HMRC to issue the Eclipse Settlement, accepting Fieldfisher's submission that the Eclipse transaction was 'a nothing' for tax purposes. HMRC gave up its claims to approximately £1.6 billion of tax and interest from 715 individuals as a result. Fieldfisher has spent the last two and a half years working with HMRC to implement the settlement for 376 of the Eclipse members.

Most of our matters are settled without recourse to the courts and remain confidential. Recent examples of such work, and current matters, include: 

  • advising on and conducting tax-related professional negligence claims;
  • advising businesses and individuals in relation to IR35;
  • advising businesses and individuals in relation to disclosures to HMRC of offshore tax irregularities;
  • advising businesses in relation to HMRC sectoral investigations into employment issues;
  • advising SRA and FCA regulated individuals in relation to COP8 and COP9 investigations into their personal tax affairs;
  • appeals against HMRC's imposition of tax charges in respect of 'avoidance schemes';
  • advising in respect of Accelerated Payment Notices and Follower Notices;
  • assisting businesses during HMRC searches under warrant at their offices; and
  • assisting (including at interviews under caution) individuals who have been accused of cheating the public revenue.
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