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      HM Treasury and HMRC have launched a programme to simplify aspects of the UK’s corporation tax system, including some potentially duplicative rules relating to financing (specifically, restrictions on the deductibility of interest and other financing costs) with the aim of reducing complexity and administrative burdens on businesses. This is likely to be of particular interest to large businesses, particularly in relation to their cross-border activities.

      International tax and financing

      The consultation acknowledges concerns expressed about the cumulative effect of overlapping rules relating to the taxation of international activities and, for financing costs, on complexity and administrative burdens, particularly since the UK has fully implemented Pillar Two rules through its multinational and domestic top-up taxes. Areas identified for simplification include the Controlled Foreign Companies (CFC) rules, the anti-hybrid mismatch rules, the Corporate Interest Restriction (CIR) and unallowable purpose rule for loan relationships.

      Any simplification measures are likely to be targeted on specific details of these rules (for example, aligning CFC exemptions with Pillar Two and possibly excluding those within Pillar Two from some of the anti-hybrid rules), rather than repealing any of these regimes. As the Government has not identified significant simplifications to CIR that would avoid material fiscal cost or risks to that regime's policy objectives, this is an area where businesses may benefit from making suggestions for specific simplifications.

        The consultation also recognises the particular concerns about the uncertain scope of the unallowable purpose rule, and the consequential impact on resources required to assess its application to many situations. It seems likely that any improvements here are likely to be limited to changes to guidance, further examples and greater use of low-risk views linked to the Advance Tax Certainty Service (ATCS), although it is possible that there could be some changes to the rule’s scope and exclusions from it.

        There is also discussion of the recent consultation on simplifying treaty relief from withholding tax on interest, including the proposal for a self-assessed approach (including a simpler process for loans from passported lenders).

        Kashif Javed

        Partner, Head of International Tax

        KPMG in the UK


        Tim Sarson

        Partner, Tax Policy

        KPMG in the UK

        Other aspects of the consultation

        The consultation also holds out the prospect of improvements to incentives, including simplifying Patent Box calculations, clarifying rules for research and development reliefs and capital allowances for large-scale investments and pre-development expenditure, which are included in our separate article “Budget: Unlocking innovation with tax incentives".

        Additionally, the consultation mentions other measures that the Government is taking to encourage business investment which includes the broadening of the ATCS, which allows businesses to apply for a binding clearance from HMRC on the tax treatment of very large investment projects. Previously, the project needed to have at least £1 billion of qualifying UK expenditure over its lifetime in order to qualify. At Budget 2026, it was announced that this threshold would be lowered to £300 million from 4 November 2026, with the aim of allowing a wider range of investment projects to qualify. We covered the basics of the ATCS in an earlier TMD article, along with details of the accompanying HMRC guidance.

        Simplifying reporting and administration

        An area of particular concern for large businesses is the increasing number of reporting obligations, particularly the duplicative nature of some of these. The consultation mentions the International Controlled Transactions Schedule on which the Government has been consulting, and indicates (without detail) that some further changes (including exemptions) are to be made to reduce compliance burdens for those subject to this transfer pricing requirement. Additionally, the consultation mentions the possible repeal of the separate reporting obligation for some international movements of capital of more than £100 million.

        Sitting alongside this consultation is a separate call for evidence which seeks views (including experience of overseas regimes) on, amongst other things, where administrative complexity and duplication arise in practice for large companies and complex groups (including as they expand) and lessons to be drawn from use of software, automation, AI and integrated business systems, with a view to better aligning corporation tax administration with businesses’ governance and assurance processes.

        Large businesses should therefore consider the consultation and call for evidence together and identify where overlapping regimes, reporting requirements or administrative processes create disproportionate cost or uncertainty, supported where possible by practical examples and suggestions for changes. The call for evidence requires responses by 20 January 2027, whereas the consultation takes a phased approach. The first step in which is to sign up (by email to ct.simplification@hmrc.gov.uk) to be considered for one of several, as yet unspecified, working groups by 21 November 2026.

        For further information please contact:

        Our tax insights

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