Guernsey Structures Under HMRC Scrutiny: What Advisers Need to Know

Guernsey has built a formidable reputation as an international finance centre, with particular strengths in fiduciary services, insurance, and investment fund administration. The island's regulatory framework, political stability, and proximity to the UK have made it a natural choice for wealth structuring, particularly for UK-connected individuals and families. However, the regulatory and tax environment in which Guernsey service providers operate has undergone fundamental change in recent years. The introduction of economic substance legislation, the expansion of automatic exchange of information under the Common Reporting Standard, and the UK's own legislative reforms — particularly the Finance Act 2025 changes to the non-dom regime — have collectively transformed the risk profile of Guernsey structures with UK connections. For Guernsey's trust companies, law firms, accountancy practices, and private wealth managers, understanding these changes is not optional — it is a matter of professional competence and regulatory compliance. The consequences of failing to appreciate the UK tax implications of the structures they administer include unexpected tax liabilities for clients, professional negligence exposure for advisers, and potential regulatory sanctions from the Guernsey Financial Services Commission.

The implementation of the Common Reporting Standard in Guernsey — through the Income Tax (Approved International Agreements) (Implementation) (Common Reporting Standard) Regulations 2015 — has fundamentally altered the information landscape for Guernsey structures with UK-connected beneficial owners. Financial institutions in Guernsey now automatically report to the Guernsey Revenue Service information about accounts held by, or for the benefit of, UK tax-resident persons, and that information is exchanged with HMRC. The scope of the CRS reporting is broad. It covers not only conventional bank accounts but also custodial accounts, equity and debt interests in investment entities, and cash value insurance contracts. For trust companies, the implications are significant: a Guernsey trust that is classified as a financial institution (because it is an investment entity) must report information about its controlling persons — which, for a trust, includes the settlor, trustees, beneficiaries, protectors, and any other natural person exercising ultimate effective control. The practical consequence is that HMRC now has access to a comprehensive picture of the Guernsey financial interests of UK-resident taxpayers. Where the information received from Guernsey does not match the disclosures made on UK tax returns, HMRC will open enquiries. The failure-to-correct provisions introduced by Finance (No 2) Act 2017 impose severe penalties — up to 200% of the tax at stake — on taxpayers who have failed to correct historical non-compliance in relation to offshore interests. Guernsey accountancy practices and trust companies need to ensure that their clients are aware of these provisions and that the information reported under the CRS is consistent with the UK tax positions adopted. Where discrepancies exist or historical non-compliance is suspected, early engagement with a specialist UK tax barrister can help manage HMRC's response and minimise penalty exposure.

Guernsey's economic substance legislation — the Income Tax (Substance Requirements) (Guernsey) Law 2018 — requires companies tax-resident in Guernsey that carry on relevant activities to demonstrate adequate substance on the island. The legislation applies to companies engaged in banking, insurance, fund management, finance and leasing, headquartering, shipping, holding company, distribution and service centre, and intellectual property activities. Compliance with these requirements is a matter for Guernsey law, but the UK tax implications of substance — or the lack of it — are equally important. From a UK perspective, the question of where a company is effectively managed and controlled determines its UK tax residence under common law principles. A Guernsey company that lacks genuine decision-making substance in Guernsey may be found to be UK tax-resident by HMRC, with the consequence that its worldwide income and gains are subject to UK corporation tax. Even where a company is accepted as Guernsey-resident, the adequacy of its substance may be relevant to other UK tax questions. The transfer of assets abroad provisions (sections 714-751 of the Income Tax Act 2007) can attribute the income of a non-resident entity to a UK-resident individual who has the power to enjoy that income. The closely held company provisions for capital gains tax purposes (section 3 of the Taxation of Chargeable Gains Act 1992) can attribute the gains of a non-resident company to its UK-resident participators. In each case, the existence (or absence) of genuine commercial substance in the offshore entity may be a relevant factor in determining whether the anti-avoidance provisions apply. Guernsey law firms and trust companies establishing or restructuring corporate entities should seek specialist UK tax counsel input to ensure that the substance profile of the entity is sufficient not only to satisfy Guernsey's domestic requirements but also to withstand scrutiny under UK tax law.

The Finance Act 2025 reforms to the non-dom regime have had a profound impact on Guernsey-administered trusts with UK-connected settlors and beneficiaries. The key changes include the abolition of the remittance basis, the introduction of new rules for the taxation of trust income and gains attributed to UK-resident settlors, and the restructuring of the excluded property trust protections for inheritance tax purposes. For Guernsey trust companies, the practical consequences are significant. Trusts that were established by non-domiciled settlors on the assumption that the remittance basis would shield UK beneficiaries from tax on offshore trust income and gains now need to be fundamentally reassessed. The question of whether to distribute accumulated income and gains — and if so, to whom and in what form — requires careful analysis of the transitional provisions and the new charging rules. The temporary repatriation facility introduced by Finance Act 2025 offers a time-limited opportunity for qualifying individuals to bring offshore trust funds to the UK at a reduced rate of tax. For Guernsey trustees administering trusts with UK-resident beneficiaries who wish to take advantage of this facility, the computational requirements are exacting and the procedural steps must be precisely followed. Errors in the calculation or filing can result in the loss of the reduced rate and the imposition of tax at full rates. Guernsey accountancy practices advising on the UK tax returns of settlors and beneficiaries of Guernsey trusts face a particularly challenging environment. The interaction between the new rules and the existing trust taxation framework — including the offshore income gains matching rules, the supplementary charge provisions, and the stock of unrealised gains held by the trust — requires a level of specialist expertise that may exceed the resources of even well-established firms.

Excluded property trusts — trusts of non-UK situs assets established by non-UK domiciled individuals — have historically been a cornerstone of Guernsey's trust industry. The excluded property exemption in section 48(3) of the Inheritance Tax Act 1984 meant that interests in such trusts were outside the scope of UK inheritance tax, regardless of the domicile status of the beneficiaries. The deemed domicile rules introduced in 2017, and now modified by Finance Act 2025, have significantly curtailed the scope of this exemption. Where a settlor has become deemed domiciled in the UK — by virtue of long residence — the excluded property trust protections may be limited or lost. The Finance Act 2025 provisions introduce new conditions that must be satisfied for trust property to qualify as excluded property, including requirements relating to the date of settlement, the nature of additions to the trust, and the domicile status of the settlor at the relevant times. For Guernsey trust companies administering excluded property trusts, these changes create an urgent need for professional advice on the continued effectiveness of the trust structure for IHT purposes. Trust protectors and beneficiaries will expect trustees to have taken appropriate advice, and the failure to do so may constitute a breach of the trustee's duty of care. Private wealth managers and solicitor firms advising clients who are beneficiaries of Guernsey excluded property trusts similarly need to understand the new rules in order to provide informed advice on the implications for their clients' overall estate planning. Daniel Feingold regularly advises Guernsey professionals on these issues and can provide the authoritative analysis needed to support trustee decision-making.

When HMRC opens an enquiry into a UK taxpayer's affairs that involves Guernsey structures, the response strategy must be carefully managed. HMRC's powers to obtain information from UK-resident taxpayers are extensive, and the failure to provide information or documents when required can result in penalties and, in extreme cases, the application of the presumption against the taxpayer in tribunal proceedings. For Guernsey trust companies and law firms, HMRC enquiries involving their clients' affairs can create tension between the duty of confidentiality owed to the client and the need to cooperate with a legitimate tax investigation. The position is further complicated by Guernsey's own data protection legislation and the requirements of the regulatory framework under which Guernsey financial services providers operate. Specialist UK tax counsel can play a valuable role in managing HMRC enquiries involving Guernsey structures. A barrister can advise on the scope of HMRC's information powers, the availability of legal privilege in relation to certain communications, the appropriate level of disclosure, and the strategy for resolving the dispute — whether through negotiation, HMRC's Alternative Dispute Resolution process, or litigation before the Tax Tribunal. Daniel Feingold has extensive experience of HMRC enquiries involving offshore structures, including Guernsey trusts and companies. He understands HMRC's approach to these cases, the evidence that HMRC typically seeks, and the arguments that are most likely to succeed in resolving disputes on favourable terms.

Daniel Feingold provides specialist UK tax counsel services to Guernsey trust companies, law firms, accountancy practices, and private wealth managers. He has a thorough understanding of the Guernsey financial services industry and the UK tax issues that Guernsey professionals encounter in their daily practice. His relevant areas of expertise include the UK taxation of Guernsey trusts and the application of the settlements legislation, the implications of the Finance Act 2025 non-dom reforms for Guernsey-administered structures, economic substance and UK corporate residence, HMRC enquiries and investigations involving Guernsey structures, the UK-Guernsey double taxation arrangement, and the CRS and AEOI compliance obligations. Daniel is readily available for conferences by video call and can visit Guernsey for complex matters or multi-party meetings. To discuss how he can assist, contact the clerks at Burnell Chambers on 020 3576 1203 or at clerks@burnellchambers.co.uk.