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Paul Farmer

Work 020 7851 8801
Joseph Hage Aaronson LLP

Work Department

Partner; Tax Disputes


Paul has been a Partner at JHA since its inception in 2013. He is an internationally recognised barrister in the field of EU law, who particularly specialises in international tax law. He is renowned for his dispute resolution experience and he has litigated before all levels of the UK courts and the European Court of Justice (CJEU), where he appears regularly.

Before entering private practice, Paul held senior positions at the CJEU and the European Commission, where he was Head of Direct Taxation. At the CJEU he worked on a wide range of cases covering almost all areas of EU law, including free movement of goods, persons, services and capacity, VAT, state aid, sex discrimination, intellectual property, environment, social security, competition, customs duties, as well as general principles and remedies.

As well as being a leading litigator, Paul’s practice includes advisory work and making representations to relevant EU bodies. He has co-authored a major textbook on EC Tax Law.


Admitted as a barrister in England and Wales

Member of the Institute of Chartered Accountants in England and Wales

Member of Revenue Bar Association

Visiting Faculty Member, International Tax Centre, University of Leiden, the Netherlands


University of Manchester - M Phil

University of Manchester – LLB

London: Dispute resolution

Tax litigation and investigations

Within: Tax litigation and investigations

Tax litigation boutique Joseph Hage Aaronson LLP is noted for its dominant position in the UK tax disputes market, enabled by its concentration of 'star individuals'. The group, which combines expertise from the Bar alongside solicitors and other experts including forensic accountants, handles complex domestic and cross-border tax disputes across a range of industry sectors for clients including Marks & Spencer,  Exxon and Sony. Founding partner Graham Aaronson QC leads the tax litigation tea, and specialises in commercial taxation - with a particular focuses on transfer pricing, oil and gas tax, life assurance office tax, structured finance, EU law and state aid. Vastly experienced Simon Whitehead is often instructed on contentious corporation tax matters, while Paul Farmer stands out for work involving European law and international tax. The group is currently representing British American Tobacco in the test case in the FII Group Litigation, which comprises 25 long-running claims by UK-headquartered multinationals challenging the UK's dividend taxation scheme and related issues. It is also acting for Prudential as the test claimant in the CFC and Dividend Group litigation, challenging the lawfulness of the UK's taxation of portfolio dividends and pension fund income. Other key names include Daniel Margolin QC, Michael Anderson, Ray McCann and 'solution-oriented' senior associate Helen McGhee who is singled out for her expertise in technical trust and offshore company matters. Former associate Philippe Freund joined Fieldfisher at partner-level in July 2018.

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