Transfer pricing rules for UK businesses

What transfer pricing means for your business

Transfer pricing rules exist to ensure that transactions between connected parties — such as a UK subsidiary buying services from its overseas parent — are priced as if the parties were independent businesses dealing at arm’s length. Without these rules, multinational groups could shift profits out of the UK by inflating or deflating prices on inter-company transactions.

These rules matter strategically because they affect where profits are taxed across a group. Getting transfer pricing wrong can lead to double taxation (two countries taxing the same profits), HMRC enquiries, and significant penalties. Getting it right requires understanding both the legal framework and the commercial rationale behind your pricing decisions.

The UK’s transfer pricing regime is set out in Part 4 of the Taxation (International and Other Provisions) Act 2010 (TIOPA 2010) and broadly follows the OECD Transfer Pricing Guidelines for Multinational Enterprises and Tax Administrations.

The arm’s length principle

The arm’s length principle is the foundation of all transfer pricing rules worldwide. It asks a simple question: would two independent businesses have agreed this price?

In practice, applying this principle requires a structured analysis:

• Functional analysis asks what functions each party performs, what assets they use and what risks they bear.
• Comparability analysis asks what independent parties would charge for a comparable transaction in comparable circumstances.
• Method selection decides which of the OECD’s five approved methods best fits your transaction. The most common are the Comparable Uncontrolled Price method (for commodity-type transactions), the Transactional Net Margin Method (for routine activities), and the Profit Split Method (for highly integrated operations).

The principle applies to all types of inter-company dealings — not just goods and services but also loans, guarantees, licensing of intellectual property, and cost-sharing arrangements. Since April 2004, UK transfer pricing rules apply to both cross-border and domestic transactions between connected parties.

The SME exemption — and when it does not apply

Small and medium-sized enterprises are generally exempt from UK transfer pricing rules. This is a significant relief, because full transfer pricing compliance is costly and resource-intensive.

To qualify as an SME for these purposes, your business must have:

• Fewer than 250 employees, AND
• Either annual turnover not exceeding €50 million, OR a balance sheet total not exceeding €43 million

These thresholds are assessed at the group level, not the individual company level. If your UK company is part of a larger multinational group that exceeds these thresholds, the exemption does not apply even if the UK entity is small.

Three important exceptions

Even if your business qualifies as an SME, the exemption is overridden in three circumstances:

• HMRC can issue a transfer pricing notice under Section 166 of TIOPA 2010, requiring a specific SME to apply arm’s length pricing. This typically happens when HMRC suspects artificial pricing in a particular transaction.
• If your company has elected into the Patent Box regime (reduced 10% rate on qualifying patent income), you must apply transfer pricing rules to all related-party transactions involving patented intellectual property, regardless of size.
• Transactions with connected parties in territories that do not have a qualifying double taxation agreement with the UK may fall outside the exemption. This targets arrangements with entities in low-tax or non-cooperative jurisdictions.

If you are an SME with inter-company transactions, the exemption gives you significant administrative relief. However, you should still price transactions commercially — the exemption protects you from formal compliance obligations, not from HMRC enquiring into transactions that appear artificial.

Documentation requirements

There is no statutory obligation to prepare transfer pricing documentation in the UK. However, for practical purposes, large companies should treat documentation as essential. HMRC expects companies to be able to demonstrate that their inter-company pricing is arm’s length, and having contemporaneous documentation is the most effective way to do so.

Good transfer pricing documentation typically includes:

• a group overview: organisational structure, business operations and the commercial rationale for inter-company arrangements
• a functional analysis of the functions performed, assets used and risks assumed by each party to the transaction
• a comparability analysis showing how you identified comparable transactions and what adjustments were made
• why you chose a particular transfer pricing method and how you applied it
• financial data on the actual results of the transactions, benchmarked against comparables

Documentation should be prepared contemporaneously — that is, at the time the pricing is set, not retrospectively when HMRC asks questions. Retrospective documentation is far less persuasive and may attract higher penalties if adjustments are needed.

The OECD’s three-tiered documentation approach (Master File, Local File, and Country-by-Country Report) provides a useful framework. UK companies that are part of groups with consolidated revenues of €750 million or more are required to file Country-by-Country Reports.

Advance Pricing Agreements

If your business has significant, recurring inter-company transactions, you can apply to HMRC for an Advance Pricing Agreement (APA). An APA is a formal agreement between your company and HMRC (and potentially the tax authority in the other country) on the appropriate transfer pricing methodology for specified transactions.

Key features of APAs:

• An APA typically covers up to 5 years and can be renewed.
• It can cover specific transaction types, such as management fees or royalties, or all inter-company dealings.
• A bilateral APA (agreed with both HMRC and the overseas tax authority) provides the strongest protection against double taxation. Unilateral APAs (with HMRC only) are faster to agree but do not bind the other country.
• APAs require significant upfront investment in professional fees and can take 12–24 months to agree. They are most cost-effective for high-value, complex, or contentious transactions.

Consider an APA if your business has large-value inter-company transactions, if you operate in sectors where comparables are difficult to find (such as financial services or pharmaceuticals), or if you have previously faced HMRC enquiries on transfer pricing.

HMRC enforcement and penalties

HMRC’s approach to transfer pricing enforcement has become increasingly sophisticated. The Large Business Directorate has dedicated transfer pricing specialists, and HMRC participates actively in the OECD’s Joint International Taskforce on Shared Intelligence and Collaboration.

If HMRC determines that a transaction is not at arm’s length, it can make an adjustment to increase UK taxable profits. Standard error penalties apply:

• If you took reasonable care, there is no penalty, though the tax adjustment still applies.
• A careless error carries 0–30% of the additional tax.
• A deliberate error carries 20–70% of the additional tax.
• A deliberate and concealed error carries 30–100% of the additional tax.

Having robust, contemporaneous documentation significantly reduces penalty exposure. If you can demonstrate that you took reasonable care in setting your transfer prices, penalties are unlikely even if HMRC disagrees with your pricing.

Transfer pricing is closely connected to the Diverted Profits Tax (DPT). From 1 January 2026, the DPT is integrated into the Corporation Tax framework, with transfer pricing rules strengthened to achieve similar outcomes, so getting your transfer pricing right matters more.

When to seek professional advice

Transfer pricing is one of the most complex areas of tax law. You should seek specialist advice if:

• Your group has significant cross-border inter-company transactions
• You are considering restructuring your group’s operations or intellectual property arrangements
• HMRC has opened an enquiry or issued an information notice relating to your inter-company pricing
• You want to explore an Advance Pricing Agreement
• Your SME status is borderline or you have transactions with non-qualifying territories