The Government confirmed it will press ahead with a package of transfer pricing reforms, including the introduction of the ICTS (with further consultation on the detailed design to follow) while keeping the small and medium sized enterprise exemption in place for now. For professional services groups, the key practical implications are (i) more standardised reporting on cross border services and financing, (ii) higher expectations on documenting people led value creation and governance, and (iii) proposed changes for financial transactions (including how group support and guarantees are considered) alongside a relaxation for many UK to UK transactions where there is no UK tax risk.

The International Controlled Transactions Schedule is intended to capture standardised factual information about cross border related party transactions and financing, to support automated and manual risk assessment. The Government’s published expectation is that the ICTS would apply for accounting periods beginning on or after 1 January 2027 (subject to final implementing regulations). For firms with high volumes of cross border service flows, the practical challenge is often data mapping and transaction categorisation, alongside ensuring the underlying transfer pricing story and documentation are consistent and supportable.

These rules introduced prescribed record keeping requirements aligned to the OECD’s Master File and Local File model. Broadly, UK entities in multinational groups that meet the CbCR threshold (consolidated revenues of at least €750m) are expected to have an annual Master File and UK Local File in place for relevant periods. The documents are not filed with the tax return, but they form part of the statutory records and should be available to HMRC on request.

This sets out HMRC’s best practice expectations across the transfer pricing lifecycle, with particular emphasis on scoping, governance, controls and keeping helpful evidence. For professional services firms, this is especially relevant where outcomes depend on people, decision making and how matters are run in practice, rather than on easily observable assets.

CbCR has long been used by tax authorities as a high level risk assessment tool, and Pillar Two raises the stakes by making effective tax rates, profits and substance a more operational dataset for many groups. For large groups, Pillar Two processes often build on CbCR (including transitional safe harbour concepts), which increases the importance of having a single, consistent narrative across (i) TP documentation and policies, (ii) CbCR outputs, and (iii) Pillar Two calculations and disclosures. More broadly, the EU and Australia have introduced public CbCR requirements, requiring publication of CbCR data in these territories, increasing transparency of group’s financial information.

A recurring focus for tax authorities is whether contractual allocations of risk, decision making and responsibilities are reflected in actual conduct. In professional services, this can be tested where the firm’s commercial model is genuinely collaborative across offices (e.g., shared origination and delivery, cross border practice leadership, centralised risk/compliance), but inter entity arrangements assume a simpler “lead office/support office” narrative (or vice versa).

These issues are often amplified following lateral partner hires or bolt on acquisitions, where legacy practices, buy in arrangements and earn out mechanics need to be integrated into the group’s existing transfer pricing framework in a way that remains coherent, evidence based and aligned with how the combined business now operates.

Centralised support models are routinely challenged, with scrutiny on whether the services provide a demonstrable benefit, whether there is duplication locally, and whether allocation keys are appropriate and consistently applied across territories.

Nuances exist with partnership models relating to the line between (i) partner stewardship activities and (ii) chargeable services can be blurred in partnership groups, particularly where senior partner time drives leadership and value creation activity across the network. This makes it important to distinguish shareholder/partner activities from genuine services that should be recharged.

Professional services firms often have value drivers that are not represented in statutory accounts but sit at the heart of profitability: brand and reputational capital, client relationships, proprietary know how and precedents, and technology/data platforms. Tax authorities increasingly expect firms to be able to explain where these value drivers are developed, controlled and funded, and to ensure that outcomes align with value creation, consistent with the OECD Transfer Pricing Guidelines.

Transfer pricing in partnership groups is often more complex because partner profit shares and the internal economics of the partnership can interact with, and sometimes unintentionally undermine, entity level transfer pricing outcomes.

Key risk areas include:

• whether partner reward aligns with where value is created (and where it is taxed), 
• whether profits are effectively allocated before/after transfer pricing adjustments (and whether that is coherent and consistently applied), 
• tension between entrepreneurial partnership returns and any transfer pricing model that assumes routine or limited risk outcomes in certain entities.

Many firms are increasingly integrated in how they originate and deliver work across borders. Where multiple entities make unique and valuable contributions, one sided tested party approaches may become harder to support, and tax authorities may expect methods that better reflect multi party value creation.

Cross border financing is common in professional services groups (acquisitions, international expansion, partner capital/work in progress funding, restructuring). Tax authority focus continues to increase on debt vs equity characterisation, arm’s length leverage capacity, implicit support and guarantees. UK reforms and HMRC’s broader compliance expectations also reinforce the need for strong evidence and governance around financial transactions.

Professional services firms can face acute PE risk because senior partners and key staff travel, (specifically as we have recently seen in times of conflict), manage clients and lead teams cross border. Tax authorities increasingly expect consistency between PE analysis and transfer pricing characterisation (i.e., the profit allocation narrative needs to align with where key functions and decision making occur). UK policy developments around PE rules (as part of wider reforms) underline that this remains a live area for internationally active groups.

Authorities are increasingly focused on whether transfer pricing policies are actually embedded into day to day operations, rather than relying on significant year end true ups. HMRC’s GfC7 places strong emphasis on governance, controls and maintaining helpful records through the transfer pricing lifecycle.

For professional services firms, OTP challenges often arise because time recording, matter management and billing systems do not always align neatly with entity level transfer pricing constructs (particularly where matters involve multiple offices and profit share arrangements).

In practice, audits are increasingly focusing less on whether a particular margin falls within an arm’s length range, and more on the quality of the underlying evidence, governance and control framework, including whether firms can demonstrate that their stated transfer pricing approach is understood, applied and monitored in day to day operations.