Jolyon has a predominantly litigation based practice in the fields of direct and indirect tax. He has particular expertise litigating cases involving avoidance, employment tax, intangible property and tax and judicial review.

Important recent cases include:

HMRC v (1) NCL Investments Limited (2) Smith & Williamson Corporate Services Limited [2019] UKUT 111 (TCC)

Professional Game Match Officials Limited v HMRC [2018] UKFTT 528 (TC)

(1) NCL Investments Limited (2) Smith & Williamson Corporate Services Limited v HMRC [2017] UKFTT 495 (TC)

Seven Individuals v HMRC [2017] UKUT 132 (TCC)

Tottenham Hotspur Limited v HMRC [2016] UKFTT 0389 (TC)

Eclipse Film Partners No 35 LLP v HMRC [2016] UKSC 24

Eclipse Film Partners No 35 [2015] EWCA Civ 95

Vaccine Research Limited Partnership [2014] UKUT 389 (TCC)

Icebreaker [2014] UKFTT 416 (TC)

Eclipse Film Partners No 35 v HMRC [2014] EWCA Civ 184

Patrick Degorce [2013] UKFTT 178 (TC)

R (oao Cameron) v HMRC [2012] EWHC 1174 (Admin) 

Eclipse Film Partners No 35 LLP [2012] UKFTT 270 TC

Lower Mill Estate [2011] STC 636 (UT)

Kuehne + Nagel Drinks Logsitics Limited v HMRC [2011] STC 576

Proteus and Samarkand [2011] UKFTT 610 (TC) (FTT)

Halcyon [2010] STC 1125 (CA)

Prudential v HMRC (CA) [2009] STC 2459 

Fleming [2008] STC 324 (HL)

  • Jolyon is one of the leading litigators in matters relating to off-payroll working (IR35). His clients include household names in broadcasting and sport.Recent cases include:
    • Represented Christa Ackroyd in her IR35 appeal before the Upper Tribunal (CAM Ltd v HMRC)
    • Represented football referees in their successful appeal about the employment status of referees (PGMOL v HMRC) “He’s very good at standing up for his client and getting the best deal possible.” – Chambers UK Bar 2020


2019: Honorary Chair in Law at Durham University
2018: Praeses Elit, Ireland; 30th Anniversary Lecture Essex Law School; Gave evidence before the Culture, Media, Sport Select Committee
2017: Founded Good Law Project, Queen Mary University of London Annual Law and Society Lecture
2016: Lawyer Hot 100; International Tax Review Global Tax 50 Influencers
2015: Advisor to the Labour Party on tax policy
2015: Hardman Lecture

Member Advisory Board of Bright Blue, Intergenerational Foundation, Tax Justice UK.

Jolyon is a graduate of the University of Durham (LLB: European Legal Studies, First Class) and Birkbeck College, London (MA: Modern Literature, Distinction) and is a Queen Mother’s Scholar (Middle Temple).

Jolyon is one of only three practising barristers in the Evening Standard’s list of London’s most influential people, 2018.

Shortlisted for Tax Silk of the Year in the Legal 500 UK Bar Awards 2019.

Shortlisted for Lawyer of the Year in the Legal Business Awards 2019.

Shortlisted for Barrister of the Year in The Lawyer Awards 2019.