On 22 September 2026, the States of Guernsey released updated economic modelling indicating that the proposed tax package is projected to generate approximately £36 million per year in additional revenue once fully implemented. The modelling, conducted by the Government’s Economic Advisory Group in collaboration with external economists, incorporates behavioural responses, international tax developments, and macroeconomic forecasts for the period 2027-2032. The figures represent a significant upward revision from earlier estimates of £28 million, reflecting refined assumptions about the impact of OECD Pillar Two adoption and the introduction of a 15% minimum effective tax rate for in-scope multinational enterprises.
Key Takeaways
- Revenue Uplift Driven by Pillar Two Alignment: The £8 million increase over previous projections stems primarily from the decision to implement a qualified domestic minimum top-up tax (QDMTT) that captures top-up tax revenues locally rather than allowing other jurisdictions to collect them under the GloBE rules. The modelling assumes that 85% of in-scope MNE groups will have effective tax rates below 15% in Guernsey, generating top-up tax liabilities that will be retained by the States.
- Behavioural Assumptions and Sensitivity Analysis: The model incorporates a moderate behavioural response, estimating a 3% reduction in taxable profits due to profit shifting and restructuring. Sensitivity analysis shows revenue could range from £32 million to £40 million annually depending on global effective tax rate trends and the number of MNE groups establishing substance in Guernsey. The Treasury has committed to annual reviews of the modelling assumptions.
- Fiscal Planning and Public Investment: The additional £36 million per year is earmarked for critical infrastructure, healthcare, and education investments under the Government Work Plan 2027-2030. The Policy & Resources Committee has signalled that the revenue will not be used to fund recurrent expenditure but will support capital projects and debt reduction, enhancing Guernsey’s long-term fiscal sustainability.
Disclaimer: This article is compiled and summarized by the AI based on publicly available information and is for general information purposes only. It does not constitute any form of formal tax advice, legal opinion, or basis for performance. Please consult a qualified professional tax advisor or legal counsel for tax advice.
Source: Read Official Announcement