Tax analysis: In CATS North Sea Limited v HMRC, the Upper Tribunal (UT) held that the deemed separate trade created by section 279 of the Corporation Tax Act 2010 (CTA 2010) applies across the corporation tax code, including the capital allowances regime, and is not confined to the computation of ring-fence profits. Consequently, the trade transfer provisions in CTA 2010, Pt 22 applied only to the part of Amoco’s ring-fence trade that remained ring-fence activities in CATS North Sea Ltd (CNSL), significantly reducing the balancing charge. The decision clarifies the wider effect of statutory deeming provisions and has important implications for oil and gas groups undertaking intra-group reorganisations, particularly where transfers may alter the ring-fence status of activities or affect capital allowances and balancing charges. Produced in partnership with Jake Landman of Pinsent Masons.