United Kingdom Transfer Pricing Policy

The UK rule works by substituting arm’s-length provision for the actual provision where the actual provision confers a potential UK tax advantage on one of the parties. The one-sided framing matters: the rule bites on the advantaged party, which is why a UK file has to identify who is advantaged before it does anything else.

The UK is unusual among major economies in having a genuine statutory exemption for small and medium-sized enterprises rather than only an administrative de minimis. Where the exemption applies, the basic rule’s adjustment provisions are switched off — which is a materially different position from a light-touch documentation expectation.

The exemption is not unconditional and it is not permanent for a growing business, so the SME status test is a live annual question rather than a settled fact. A group that qualified two years ago and has since acquired or grown may be inside the rule without having noticed, and the first year inside it is the year the file has to exist.

The statutory position

• The UK transfer pricing rules are in Part 4 of the Taxation (International and Other Provisions) Act 2010, which is headed "Transfer pricing". The basic rule is in section 147.
• Chapter 3 of Part 4 contains exemptions from the basic rule. Section 166 is headed "Exemption for small and medium-sized enterprises" and provides that section 147(3) and (5) do not apply in calculating the profits and losses of a potentially advantaged person for a chargeable period if that person is a small or medium-sized enterprise for that period.

Those references were read in the primary source — legislation.gov.uk — on 2026-08-19, and they are quoted because they were read. Legislation is amended and guidance is reissued, so confirm the current text before relying on any of it for a filing position.

The UK has no standalone transfer pricing return. The obligation is to have prepared the records needed to demonstrate an arm’s-length result, and to be able to produce them to HMRC on request within the period HMRC allows. The file does its work by existing at the right time.

For larger businesses the UK requires master file and local file documentation in the OECD shape, and country-by-country reporting applies to groups above the reporting threshold. Which of those attach to a particular group depends on its size — the threshold test is the first question, and the answer determines whether the obligation is a formal documentation set or the general record-keeping duty.

The specific size criteria for the SME exemption, the thresholds for the formal documentation requirements and the periods HMRC allows for production are set in legislation and guidance that have been amended. We confirm the current position against HMRC guidance and the legislation itself for the period in question rather than quote a figure here.

The three-tier documentation shape

Almost every regime in this guide organises documentation the way BEPS Action 13 recommended: a master file describing the group, its structure, its intangibles and its financing; a local file describing the local entity’s own controlled transactions and the analysis behind their pricing; and a country-by-country report giving administrations an aggregate view of where the group books revenue, profit, tax and people. That last report is owed only above a size threshold, and the OECD’s agreed figure is EUR 750 million of consolidated group revenue, or a near equivalent amount in domestic currency as of January 2015 (OECD, Action 13 country-by-country reporting (oecd.org)). Each jurisdiction legislated its own local-currency equivalent; those are not repeated on this page, because they were not read from the source.

What we confirm before a United Kingdom file is signed off

• Which tiers of documentation are genuinely due for the period in front of us, checked against what HMRC requires now — not against what it required when the last file was written.
• Whether every intercompany flow has been characterised — the recharge, the guarantee, the seconded employee and the loan are the ones routinely missing from the transaction list.
• That the paperwork tells one story — agreements, invoices, management accounts and the policy the file sets out, all saying the same thing about the same year.
• That the local narrative is consistent with what the group has already reported for United Kingdom anywhere else, because the authority sees both.

The UK applies the arm’s-length principle by reference to the OECD Transfer Pricing Guidelines, which are given statutory force in construing Part 4. That is a meaningful difference from a jurisdiction that merely draws on them: the OECD method set and its guidance on comparability are part of the interpretive framework rather than persuasive material. The recurring UK issue is not method selection but the accuracy of the delineation of the transaction — who did what, who bore what risk — because the Guidelines make that the first step and it is the step most files compress.

The five methods in the OECD framework

Comparable uncontrolled price (CUP)

A like-for-like price comparison against an uncontrolled deal. It carries more weight than any other method when the comparable is real, and it collapses fastest when it is not — which is why it dominates commodity and licensing analyses and is rarely available anywhere else.

Resale price

Works backwards from the onward sale: take what the related reseller got from an unrelated buyer and deduct the gross margin an independent reseller would have earned. It fits a distributor that adds no physical value, and it lives or dies on whether the comparison companies carry the same functions and risks.

Cost plus

Adds an arm’s-length mark-up to the costs the related supplier incurred. The natural fit for contract manufacturing and routine services, and the disputes are almost all about the cost base rather than the percentage — what was included, what was pushed below the line, and whether the accounting stayed the same.

Transactional net margin (TNMM)

Compares a net profit indicator — operating margin, return on costs, return on assets — against independent companies performing similar functions. The workhorse of most documentation because it tolerates product differences, and the method most exposed to a weak comparable set, since the search criteria decide the answer.

Profit split

Allocates the combined profit according to what each party contributed. It is the method for genuinely two-sided situations: both parties bringing something unique and valuable, operations too integrated to price one side in isolation, or risk that both parties genuinely share.

The method matters less than the reasoning behind it. A United Kingdom file that shows which methods were considered, what data was available for each and why one was preferred is defending a decision; one that names a single method is defending an assumption.

A United Kingdom transfer pricing file is a piece of evidence before it is a piece of compliance, and it is read by someone looking for the gap between what the policy says and what the ledger did. That is the gap we work on first.

What a United Kingdom engagement covers

• Transaction mapping and delineation. Every related-party flow into and out of the United Kingdom entity, characterised and reconciled to the ledger, before any analysis begins.
• Functions, assets and risks. What the United Kingdom operation really does, who takes the decisions, and which risks it can actually control. Everything downstream depends on getting this right, and it is the part most files compress.
• Method selection, reasoned on the record. The method chosen for each tested transaction, with the alternatives considered and the reason each was set aside.
• Benchmarking you can audit. The search criteria, every screening decision and every comparability adjustment set out in full, so a reviewer reproduces the result rather than building their own.
• Documentation to HMRC’s expected shape, consistent with the group’s master file and with what has been reported for United Kingdom elsewhere.
• Sourcing, stated. Each threshold, deadline and rate in the finished file is checked against HM Revenue & Customs (HMRC) for the relevant period. Where we cannot confirm a figure, the file explains the mechanism and gives no number.

Advance certainty and dispute resolution

HMRC operates an advance pricing agreement programme and the UK has an extensive treaty network providing the mutual agreement procedure. HMRC also runs a real-time working and risk-review approach with larger businesses, so for many groups the transfer pricing conversation is continuous rather than triggered by an enquiry.

How we work

The fee is agreed in writing before any work starts, and you review the result before anything is filed. Where your United Kingdom entity sits relative to our offices makes no difference to how the file gets built. If you want to talk it through first, the helpline answers 24 hours a day and there is no obligation attached to a call — contact us or read our transfer pricing service page for what a full engagement includes.

What has actually changed in United Kingdom is the starting point of an audit. It used to begin with an information request; it now begins with the group's own exchanged data and a risk assessment already formed. That moves the taxpayer's work earlier — the file has to be persuasive on arrival rather than developed in correspondence.

Where challenges concentrate in United Kingdom

• SME status is treated as a fixed attribute and it is not. Growth, an acquisition or a change in group structure can take a business out of the exemption mid-stream, and the year it happens is the year with no file.
• Intra-group services and management charges between a UK company and its overseas group are the most common enquiry topic in the mid-market, and the weakness is usually that the charge was set as a cost allocation and never tested as a price.
• Because the Guidelines make accurate delineation the first step, a UK file that starts with a benchmarking study has started in the middle. HMRC enquiries frequently unpick the functional analysis rather than the comparable set, and a file that is thin at the front cannot be rescued at the back.

What it costs when the file is not there

When a United Kingdom position fails, it usually fails in more than one place at once: an adjustment here, no corresponding relief there, and a documentation consequence that attaches whether or not the pricing is eventually agreed. The exposure is not the tax on the adjustment — it is the whole chain.

By business size

Owner-managed group

The SME exemption may switch the basic rule off entirely — which makes confirming SME status the single highest-value piece of UK transfer pricing work at this size.

Mid-market group

Outside the exemption, the duty is to hold records that demonstrate an arm’s-length result and to produce them on request. There is no filing to remind you.

Multinational group

Master file, local file and country-by-country reporting engage, and HMRC’s risk-review approach means the file is read as part of an ongoing relationship rather than a one-off enquiry.

By industry

Financial and professional services

Cross-border service delivery, secondments and intra-group funding are the classic UK related-party set, and the secondment is routinely unpriced.

Technology and digital

Development work performed in the UK for group-owned intangibles needs the UK contribution described before any margin is benchmarked.

Distribution and inbound operations

A UK distributor or agent for an overseas group raises the question of what functions and risks actually sit in the UK entity.

Read these as starting points rather than categories. The transfer pricing question is set by the group structure and the intercompany agreements, not by what the business sells — so two United Kingdom companies of the same size in the same sector routinely need completely different files. The sector says where to look; the agreements say what is there.