International expansion remains a key growth strategy for many UK businesses. Whether entering new markets through overseas branches, establishing local operations or supporting global clients, expanding abroad can offer significant opportunities.
However, forthcoming changes to the UK’s Foreign Permanent Establishment (FPE) regime could have important tax implications for businesses with overseas branch operations and for those considering international expansion in the future.
The Government has announced that the current elective Foreign Permanent Establishment exemption regime will become mandatory, representing one of the most significant changes to the UK’s international tax framework in recent years. For accounting periods beginning on or after 1 January 2027 for most companies, and as of 1 September 2026 for certain oil and gas companies, UK resident companies will no longer be able to choose how foreign branch profits and losses are treated for UK corporation tax purposes.
What is changing and why does it matter?
Under the current rules, UK resident companies can elect into the Foreign Permanent Establishment exemption regime. Once it takes effect, the election is generally irrevocable, so companies cannot switch in and out of the regime each year. Where an election is made, profits and losses arising from overseas branches are generally excluded from UK corporation tax. Alternatively, companies can choose not to make the election, in which case foreign branch profits remain within the scope of UK corporation tax, with double taxation relief where available. Overseas branch losses may then be offset against UK taxable profits, subject to the applicable loss relief rules. This can be particularly valuable during the early stages of overseas expansion when losses are common.
The new regime removes this choice entirely. The exemption will become mandatory, meaning both foreign branch profits and losses will generally be excluded from UK corporation tax calculations, subject to the applicable exclusions and anti-diversion rules. While this creates a more straightforward and territorially focused tax system, it also removes the ability to obtain UK tax relief for overseas branch losses.
For many businesses, this could increase the effective cost of international expansion. New overseas operations often require significant upfront investment before becoming profitable. Historically, losses generated during this start-up phase could potentially be relived against UK profits, reducing the overall tax burden and improving cash flow. Under the new rules, that benefit will disappear.
The Government’s objective is to prevent situations where businesses receive UK tax relief for overseas losses without corresponding UK taxation of future overseas profits. The changes are intended to support a more consistent territorial tax approach while protecting the UK tax base.
The practical impact on growing businesses
For businesses with existing overseas branches that have not already elected into exemption, the immediate impact is likely to be the loss of tax relief for foreign branch losses. Companies that have historically benefited from using overseas losses to reduce UK taxable profits may see higher corporation tax liabilities and increased pressure on cash flow during periods of international investment.
The changes may also influence decisions about how overseas operations are structured. In the past, the ability to access UK loss relief often made branch structures attractive during the initial stages of overseas expansion. Once the new rules take effect, the tax difference between branches and subsidiaries will be reduced, meaning businesses may need to place greater emphasis on commercial, legal and regulatory considerations when determining the most appropriate structure.
For larger groups, there may also be wider considerations around transfer pricing, controlled foreign company rules, double tax relief and Pillar Two global minimum tax requirements. While these issues may primarily affect multinational organisations, they demonstrate how the FPE changes could influence broader international tax planning.
Businesses considering overseas expansion should not assume these rules only affect large multinationals. Many owner-managed businesses and mid-market companies choose to enter foreign markets through branches before establishing standalone subsidiaries. The loss of overseas branch relief could materially affect expansion budgets, investment appraisals and projected returns from international growth initiatives.
Why early planning is essential
Although the legislation is designed to simplify aspects of the UK’s territorial tax regime, the transition will require careful planning. Businesses with overseas branches, particularly those currently generating losses or expecting losses during future expansion projects, should begin reviewing their position will before the new rules take effect.
Areas that may warrant consideration include modelling the impact on future tax liabilities, forecasting cash flow implications reviewing branch versus subsidiary structures and identifying how the transitional restrictions may affect existing overseas losses carried forward into the new regime. The Government has also published proposals for transitional loss restrictions and targeted anti-avoidance rules, which must be considered before taking steps to utilise losses ahead of the change, making timely professional advice even more important.
For many businesses, the key question will be whether their current international structure remains appropriate once tax relief for overseas branch losses is no longer available. A proactive review now could help avoid unexpected tax costs and support better-informed expansion decisions in the future.
International growth continues to present exciting opportunities, but changes such as these demonstrate how quickly the tax landscape can evolve. If your business has overseas branches, is exploring international growth opportunities, or would like to assess the potential impact of these changes, please get in touch. Our team of experts can review your current structure and provide practical advice to ensure your international growth strategy remains both commercially and tax efficient.
