Significant cases in which Paul has acted include:
- Case C-465/03 Kretztechnik v Finanzamt Linz [2005] ECR I-4357 concerning the legality of the UK rules on VAT on share issues
- Case 446/03 Marks & Spencer v Halsey [2005] ECR I- 10837 concerning the compatibility with EU law of the UK system of group relief
- TNT Post v Commissioners for Her Majesty’s Revenue & Customs [2009] ECR I-3025 concerning judicial review of the Post Office’s VAT exemption
- Autologic Holdings plc & others v Commissioners of Inland Revenue [2005] UKHL 54, [2006] 1 AC 118: concerning the jurisdiction in tax matters of the High Court
- C-374/04 Test Claimants in the ACT Class 4 Group Litigation v Commissioners of HMRC [2006] ECR I-11673: claims challenging the failure to grant treaty credits in certain circumstances under the UK’s imputation system
- C-446/04 Test Claimants in the FII Group Litigation v Commissioners of HMRC [2006] ECR I-11753: claims challenging the UK system of dividend taxation and the incidence of surplus ACT upon UK groups with their sources of profit abroad
- C-524/04 Test Claimants in the Thin Cap Group Litigation v Commissioners of HMRC [2007] ECR I-2107: claims challenging the lawfulness under European law of the UK’s thin capitalization provisions
- C-201/05 Test Claimants in the CFC & Dividend Group Litigation v CIR [2008] ECR I-2875: claims challenging the lawfulness under European law of the UK’s controlled foreign company rules and aspects of their dividend taxation provisions
- Europcar UK Ltd & ors v Commissioners of HMRC [2008] EWHC 1363 (Ch), [2008] STC 2751: considering whether a valid claim in mistake had been made prior to the coming into force of s320 FA04
- MoneyGram Payments Systems v Commissioners for HMRC (Lon/2006/8084) concerning the UK and EU moneylaundering rules.
As referendaire to Advocate General Jacobs Paul worked on a wide range of cases covering virtually all areas of EU law, including free movement of goods, persons, services and capital, VAT, state aid, sex discrimination, intellectual property, environment, social security, competition, customs duties as well as general principles and remedies.