Transfer Pricing Basics, Part 1 of 3. You are here: what transfer pricing is and what it covers. Part 2: how an arm's length price is proven — the five methods, comparables and the range. Part 3: who has to file documentation — tiers, thresholds and penalties.
Two clarifications before the rules. Transfer pricing in the tax sense is not the internal charge a controller sets to steer divisional behaviour, and it is not funds transfer pricing, the bank technique for allocating interest margin between a treasury and its business units. The words are shared; the discipline is not. And the transfer pricing rules are not an accusation. They apply in a group of eight people and in one of eighty thousand, whether or not anyone gave tax a moment's thought — because the test is objective.
What actually counts as transfer pricing?
Two conditions have to be met. The parties must be associated — in treaty language, one participates directly or indirectly in the management, control or capital of the other, or the same persons participate in both. And there must be a commercial or financial relation between them: a transaction.
That covers almost everything crossing an intercompany line, and the OECD Guidelines route each category to its own chapter.
What sits outside the concept is narrower than most people expect. A transaction between two unrelated companies is not a transfer pricing question, however aggressive the price. A purely domestic intercompany transaction usually is not one either, since Article 9 addresses enterprises of two different states — though several jurisdictions apply their rules domestically as well, and the UK has just legislated an explicit exemption for qualifying UK-to-UK provision in the Finance Act 2026.
Why do two tax authorities care about the same invoice?
Because the alternative would be to let each group decide, by invoice, where its profit appears.
The international system treats a multinational as a collection of separate taxpayers rather than one business. Each state taxes the profit of the entity resident in it. If a German manufacturer sells to its French distribution subsidiary at a price 10 % above the arm's length level, profit moves from France to Germany with no operational change at all. Multiply by a group's transaction volume and the mispricing is worth more than most tax planning.
The correction rule sits in Article 9(1) of the OECD Model Tax Convention, quoted in the OECD Transfer Pricing Guidelines at paragraph 1.6:
[Where] conditions are made or imposed between the two [associated] enterprises in their commercial or financial relations which differ from those which would be made between independent enterprises, then any profits which would, but for those conditions, have accrued to one of the enterprises, but, by reason of those conditions, have not so accrued, may be included in the profits of that enterprise and taxed accordingly.
The consequence practitioners underrate is that the risk runs both ways. If one state adjusts profit upwards, the other does not automatically release the corresponding amount. Article 9(2) provides for a corresponding adjustment and Article 25 for a mutual agreement procedure, but both take years. Which is why the pre-emptive route matters: an advance pricing agreement fixes the treatment of specified future transactions with both administrations before they happen — in Germany under section 89a of the Fiscal Code, on application, for a period that should not normally exceed five years.
Since the BEPS project the same numbers are read for more than one purpose. Country-by-country reports give administrations a group-level map for risk assessment, and the global minimum tax reads benchmarking results from a different angle. One weak analysis now surfaces in several places at once.
What the arm's length principle actually asks for
The principle is easy to state and hard to apply, because a comparison needs something to compare with. Paragraph 1.6 explains that by adjusting profits by reference to the conditions that would have obtained between independent enterprises in comparable transactions and comparable circumstances, the arm's length principle treats members of a group as separate entities rather than inseparable parts of one business — and that the resulting analysis of controlled against uncontrolled transactions, the comparability analysis, "is at the heart of the application of the arm's length principle".
So the first task is not pricing. It is delineating the transaction accurately, on five economically relevant characteristics set out at paragraph 1.36:
- the contractual terms of the transaction;
- the functions performed by each party, taking account of assets used and risks assumed;
- the characteristics of the property transferred or services provided;
- the economic circumstances of the parties and of the market;
- the business strategies pursued by the parties.
The contract is the starting point, not the conclusion. Where conduct diverges from the written terms, conduct governs — a distributor described in the agreement as limited-risk but which in fact carries inventory and bad-debt risk is not a limited-risk distributor for these purposes. A transfer pricing policy that says one thing while the operating model does another is a liability rather than a defence.
This is the step that decides everything downstream, which is why our article on the arm's length principle in tax law spends its length on the functional analysis rather than on formulas.
Where this leaves you
Three questions follow from the principle, and they have to be answered in order. What is the transaction, really? What price or margin would independent parties have agreed for it? And what has to be on file to show it? Part 1 answered the first. The second is a method question and, underneath that, a data question — the subject of Part 2. The third is a compliance question with national answers, and it carries the penalties: Part 3.
One thing is worth saying at the outset. Financing is the category where the answer is most often observable: interest rates have a market, so arm's length interest rates are a price comparison under Chapter X rather than a margin exercise, and credit spreads and synthetic ratings do most of the work. Everywhere else, the answer has to be built from third-party data — which is where the next part starts.
Next in this series: Part 2 — How Is an Arm's Length Price Proven?
References
- OECD Transfer Pricing Guidelines for Multinational Enterprises and Tax Administrations 2022 — Ch. I para. 1.6 (authoritative statement of the arm's length principle, quoting Art. 9(1) OECD Model Tax Convention; separate-entity approach; comparability analysis) and para. 1.36 (economically relevant characteristics); chapter allocation by transaction type: Ch. VI (intangibles), Ch. VII (intra-group services), Ch. VIII (cost contribution arrangements), Ch. IX (business restructurings), Ch. X (financial transactions)
- OECD Model Tax Convention — Art. 9(1) (associated enterprises), Art. 9(2) (corresponding adjustment), Art. 25 (mutual agreement procedure)
- Germany: § 1 Abs. 1 Satz 1 Außensteuergesetz (arm's length principle); § 89a Abgabenordnung (advance pricing agreements — specified transactions not yet realised, period normally not exceeding five years)
- United Kingdom: Finance Act 2026, Sch. 6 — new s. 164A TIOPA 2010, exemption for qualifying UK-to-UK provision
Related pages
- Transfer Pricing Benchmarking & TNMM Analysis — the module, the profit level indicators and the calculation log on live data
- Part 2 — How Is an Arm's Length Price Proven? — the five methods, the tested party and the arm's length range
- Part 3 — Who Has to File Transfer Pricing Documentation? — the three tiers, the German and UK thresholds and the penalties
- The Arm's Length Principle in Tax Law — the functional analysis behind every method choice
- Determining Market Interest Rates Using the Arm's Length Method — the one category where a price comparison usually works
- Credit Spreads & Interest Rates — synthetic ratings and intercompany loan pricing under OECD Chapter X
