UK Tax Changes 2026: Transfer Pricing, Permanent Establishment and Diverted Profits Tax

From 1 January 2026, important UK tax changes have affected transfer pricing, permanent establishment and Diverted Profits Tax rules. The reforms are intended to simplify the UK’s international tax framework, align domestic law more closely with OECD principles, and ensure that profits connected with UK economic activity are taxed appropriately in the UK.

These changes are relevant for UK companies with overseas operations, foreign companies trading in the UK, multinational groups, funds, investment managers, and businesses with cross-border financing, intellectual property or management arrangements.

Although described as simplification measures, the reforms should not be treated as minor technical updates. They may affect transfer pricing documentation, UK permanent establishment risk, and how former Diverted Profits Tax concepts are managed within Corporation Tax.

What are the UK tax changes 2026?

The UK tax changes 2026 cover three connected areas: transfer pricing, permanent establishment, and Diverted Profits Tax.

The reforms apply for accounting periods beginning on or after 1 January 2026, with some transitional provisions for financing arrangements and exchange gains and losses. HMRC has published official guidance on the reform of transfer pricing, permanent establishment and Diverted Profits Tax.

They affect foreign companies with UK permanent establishments, UK resident companies within transfer pricing rules, and groups previously within the scope of Diverted Profits Tax. The wider direction is clear: HMRC wants profits to be aligned with real economic activity, genuine decision-making and properly supported pricing.

UK tax changes 2026 and transfer pricing reform

Transfer pricing rules require connected-party transactions to be priced as if they were made between independent businesses. This matters because multinational groups can move profits through management charges, royalties, intra-group loans, intellectual property transfers, cost-sharing arrangements and risk allocation.

The 2026 reforms amend several areas of the UK transfer pricing regime, including the participation condition, intangible fixed assets, UK-to-UK transactions, financial transactions and interpretation by reference to OECD principles.

Participation condition

The participation condition determines whether parties are sufficiently connected for transfer pricing rules to apply.

The new rules introduce a form of direct participation where two persons are subject to an agreement for common management and it is reasonable to suppose this creates a prescribed alignment of economic interests. There is also an anti-avoidance rule where arrangements have a main purpose of avoiding the participation condition.

Businesses should not assume transfer pricing only applies where there is a simple shareholding relationship. Management influence, aligned commercial interests and wider control arrangements may also become relevant.

Intangible fixed assets

The reforms simplify the valuation approach for intangible fixed assets. Where cross-border transactions between related parties fall within UK transfer pricing rules, the arm’s length price will apply. In other cases, the market value will apply.

This matters for companies transferring or licensing intellectual property, software, brands, customer relationships, know-how or other intangible assets. Where assets move across borders, pricing should be supported by commercial reasoning and valuation evidence.

UK-to-UK transfer pricing and OECD interpretation

Domestic UK-to-UK transactions will be exempt from transfer pricing where there is no risk of tax loss. This may reduce compliance for wholly UK groups in low-risk cases, although companies should still consider whether a potential UK tax loss exists.

The legislation also clarifies that the OECD Model Tax Convention and OECD Transfer Pricing Guidelines can be used as interpretative aids, whether or not a double tax treaty applies. Documentation should explain who performs key functions, who controls risk, where assets are used, and why the pricing reflects what independent parties would have agreed.

UK tax changes 2026 and financial transactions

The reforms include changes for guarantees, implicit support, excessive borrowing and exchange gains and losses.

A key issue is group support. A subsidiary may receive better borrowing terms because lenders assume the wider group would support it, even without a formal guarantee. The new rules distinguish implicit support from explicit guarantees and align the UK approach more closely with OECD transfer pricing principles.

Explicit guarantees will be considered where they are arm’s length. Implicit support must also be taken into account when applying UK transfer pricing rules.

This is relevant for groups with intra-group loans, cash pooling, external borrowing supported by group strength, or UK companies borrowing from connected parties. Before 2026, businesses should check whether financing arrangements remain commercially supportable and properly documented.

UK tax changes 2026 and permanent establishment

A permanent establishment can bring a foreign company within the UK Corporation Tax net where it has a sufficient taxable presence in the UK.

The 2026 reforms align the UK domestic definition of permanent establishment with Article 5 of the 2017 OECD Model Tax Convention. Profit attribution rules are also being revised to align more closely with Article 7 and related OECD guidance.

Foreign companies with UK activity should review whether their UK presence creates a permanent establishment and, if so, how much profit should be attributed to it.

Relevant factors include where contracts are negotiated or concluded, where senior employees or agents are based, whether UK personnel play the main sales role, whether UK premises are used as a fixed place of business, and where key risks, assets and decisions sit.

For UK/UAE businesses, this can be especially relevant where a UAE company has UK-based founders, directors, sales staff or strategic decision-makers. Incorporation outside the UK does not automatically prevent UK tax exposure if the facts show meaningful UK activity.

This also links to corporate residence and substance. Tax authorities often look beyond incorporation to where key management decisions are made, who controls bank accounts, where directors are based and where operations take place. In some jurisdictions, similar risks may be described as corporate residency challenges or “esterovestizione”. The terminology differs, but the core principle is consistent: international structures should reflect real management, control and economic substance.

Investment Manager Exemption changes

The UK tax changes 2026 also update the Investment Manager Exemption.

The reforms make the exemption operate more clearly as a safe harbour rather than a mandatory alternative to the general agent exemption. They also expand the exemption to cover a wider range of fund transactions, include investment advisers as well as investment managers, remove Condition D, commonly known as the 20% rule, and remove a related charging provision that HMRC considers no longer necessary in practice.

These changes may help funds, investment managers and advisers using UK-based personnel. However, businesses should still confirm whether their arrangements meet the relevant conditions and whether UK activity creates wider tax exposure.

What happens to Diverted Profits Tax from 2026?

One of the most significant changes is the repeal of Diverted Profits Tax as a standalone tax. Instead, the legislation introduces a Corporation Tax charge for Unassessed Transfer Pricing Profits within Part 4A of TIOPA 2010. In practical terms, diverted profits concepts are being brought into the Corporation Tax framework rather than removed entirely.

The new rules retain important features of Diverted Profits Tax, including a notice-based process, but remove the notification requirement. They also retain two gateway tests: the effective tax mismatch outcome and the tax design condition, previously known as the insufficient economic substance condition.

Businesses should not treat the repeal of Diverted Profits Tax as a relaxation of HMRC’s approach. Groups with low-substance arrangements, aggressive transfer pricing positions or structures that allocate profits away from UK activity may still face scrutiny.

Why the UK tax changes 2026 matter for cross-border businesses

The reforms reflect a wider international tax trend: profits should be aligned with real economic activity.

For cross-border businesses, the key questions are whether related-party transactions are arm’s length, documentation reflects what people actually do, UK functions and risks are properly identified, overseas entities have genuine substance, and HMRC could argue that profits have not been properly assessed within Corporation Tax.

For UK/UAE groups, this is particularly important where management, shareholders, clients and staff are split between jurisdictions. A UAE company with UK-based strategic control may still raise UK tax questions. Equally, a UK company using a UAE entity should ensure that pricing, contracts, staffing and decision-making are aligned with reality.

International structures can be effective when properly designed and supported by genuine operations. They become risky when they are tax-led, poorly documented or disconnected from where value is created.

Practical steps businesses should take before 2026

Businesses affected by the UK tax changes 2026 should take five practical steps.

1.      Review transfer pricing policies

Review intra-group pricing for management services, royalties, intellectual property, financing, sales support, procurement and cost recharges. Pricing should reflect actual functions, risks and assets.

2.      Assess UK permanent establishment risk

Foreign companies with UK activity should review whether UK-based people, premises, agents or decision-makers create a UK taxable presence, especially where senior personnel work remotely from the UK or UK teams negotiate contracts.

3.      Revisit financing arrangements

Groups with intra-group loans, guarantees, cash pooling or external debt supported by wider group strength should review implicit support and explicit guarantees.

4.      Check substance and governance

Businesses should ensure that legal structure, management location and operational substance are aligned, including board decisions, director residence, banking control, contracts and staff functions.

5.      Update internal tax governance

The integration of Diverted Profits Tax concepts into Corporation Tax may affect tax risk management. Tax teams should update review processes accordingly.

How WellTax can help

The UK tax changes 2026 create compliance obligations and planning considerations. For some businesses, the reforms may reduce complexity. For others, they may expose weaknesses in transfer pricing, UK activity, overseas structures or substance.

WellTax can support businesses by reviewing transfer pricing documentation, UK permanent establishment exposure, UK/UAE group structures, intra-group financing, intellectual property transfers, diverted profits risk, and substance governance.

The aim should be to build structures that are commercially realistic, properly documented and sustainable under UK and international tax principles.

Conclusion

The UK tax changes 2026 represent a significant reform of the UK’s international business tax framework. Transfer pricing rules are being updated, permanent establishment rules are being aligned more closely with OECD standards, and Diverted Profits Tax is being replaced with a Corporation Tax charge for unassessed transfer pricing profits.

HMRC will continue to focus on economic activity, substance, arm’s length pricing and the correct allocation of profits.

Companies with UK and international operations should review their arrangements. Early preparation can help reduce uncertainty, identify exposure and ensure cross-border structures remain compliant, commercial and defensible.