Corporate interest restriction

FORTHCOMING CHANGE relating to corporate interest restriction administration simplification: On 29 April 2025, the UK government announced that it would be engaging with stakeholders on opportunities to simplify and improve the corporate interest restriction administration rules—in particular, around the appointment of reporting companies. Stakeholders with relevant technical expertise were invited to join an HMRC working group to take this forward. See News Analysis: Tax update spring 2025—Tax analysis—Corporation tax and international.

The rules comprising the corporate interest restriction (CIR) were introduced with effect from 1 April 2017 in order to tackle erosion of the UK tax base through the use of interest deductions.

The main rules are found in Part 10 of the Taxation (International and Other Provisions) Act 2010 (TIOPA 2010), with related administrative provisions being found in TIOPA 2010, Sch 7A. HMRC's published guidance on the CIR can be found in its Corporate Finance Manual, starting at CFM95000.

The CIR rules are lengthy and complex. Many of the key operative provisions are heavily calculations-based, and use multiple defined terms. For an introduction to the CIR rules and a more

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Latest Tax News

Tax weekly highlights—19 March 2026

This week's edition of Tax weekly highlights includes: (1) the enactment of Finance Act 2026 on 18 March 2026, (2) HMRC launching a consultation on extending the Uncertain Tax Treatment regime, (3) News Analysis on the Court of Appeal’s decision in Muller UK and Ireland Group LLP that amortisation debits were correctly disallowed by HMRC, (4) News Analysis on the UT’s decision in Putney Power Limited on the issue of whether the appellants had begun to trade by the relevant date for EIS relief purposes, (5) new HMRC guidance on multinational top-up tax and domestic top-up tax reporting software, and (6) News Analysis on the FTT’s decision in Countrywide Partners Limited to uphold a penalty for failure to comply with a stop notice issued under the promoters of tax avoidance schemes (POTAS) rules.

Upper Tribunal denies EIS relief as trade not commenced (Putney Power and Piston Heating v HMRC)

Tax analysis: The Upper Tribunal (UT) has held that the First-tier Tax Tribunal (the FTT) made a material error of law in its approach to determining when a trade has ‘begun to be carried on’ by a company for the purposes of qualifying for Enterprise Investment Scheme (EIS) relief under section 179(2)(b) of the Income Tax Act 2007 (ITA 2007). The FTT had identified a set of principles by reference to factors which were of relevance in previous cases and applied those ‘legal’ principles to determine that neither Putney Power Limited (‘Putney’) nor Piston Hearing Services Ltd (‘Piston’) had begun to carry on a trade by the relevant date of 4 April 2018. The UT set aside the FTT’s decision on the basis that the FTT had sought to apply a principles-based test which did not exist as a matter of law. The proper approach requires a multi-factorial evaluation of all of the circumstances in the case at hand. The UT re-made the decision but ultimately reached the same conclusion as the FTT, dismissing the appeals of both Putney and Piston and holding that neither company had commenced trading by the relevant date. The decision is significant because it clarifies that there is no strict legal test for when a trade commences: the question remains highly fact sensitive and will be determined by reference to the particular facts and circumstances of each case. Written by Kate Ison (partner at Macfarlanes LLP) and Victoria Braid (associate at macfarlanes LLP).

FTT upholds £1m penalty for stop notice breach (Countrywide Partners Ltd v HMRC)

Tax analysis: In Countrywide Partners Ltd v HMRC, the First-tier Tax Tribunal (FTT) upheld HMRC’s £1m penalty on the taxpayer for breach of a stop notice under section 236A of the Finance Act 2014 (FA 2014), holding that the appellant continued to promote the arrangements by organising and managing them (including issuing payslips and making payments) for existing users.

Court of Appeal upholds UT decision disallowing amortisation debits (Muller UK and Ireland Group LLP and others v HMRC)

Tax analysis: In Muller UK and Ireland Group LLP and others, the Court of Appeal dismissed the appellants’ appeals against the Upper Tribunal (UT)’s decision that amortisation debits were correctly disallowed by HMRC.