Transfer pricing documentation refers to the contemporaneous records a taxpayer must prepare and maintain to demonstrate that the pricing of controlled transactions satisfies the arm’s length standard. The legal obligation arises from domestic legislation in each jurisdiction — such as Article 57 of the French General Tax Code, Czech and Polish tax statutes, and equivalent provisions across OECD member and non-member states — and is underpinned by the arm’s length principle in Article 9 of the OECD Model Tax Convention. Documentation serves both a substantive function, establishing that prices were set at arm’s length, and a procedural one, determining where the burden of proof lies when authorities challenge reported prices.

Disputes arise when tax authorities conduct audits and conclude that a taxpayer’s documentation is inadequate, internally inconsistent, or supports a characterisation of the controlled transaction that is incorrect. In the Aisan Industry Czech case, documentation classified the company as a limited-risk contract manufacturer, yet the entity sustained persistent operating losses — a factual inconsistency the authorities successfully exploited. In Issey Miyake Europe, French authorities used the absence of credible benchmarking to apply Article 57. In the Iceland calcareous algae case, the company’s cost-plus methodology was undermined by an improperly defined cost base that excluded payroll and depreciation. In Delmonte Kenya, disputed functional characterisation as a cost-plus manufacturer versus a fully fledged entrepreneur turned on what the documentation actually showed about risk assumption and asset ownership. The Danish C-Advisory Business case illustrates that wholly undocumented or artificially structured arrangements face near-automatic recharacterisation.

The OECD Transfer Pricing Guidelines provide the core framework. Chapter V (paras 5.1–5.32 of the 2022 TPG) sets out the three-tiered documentation standard — master file, local file, and country-by-country report — introduced through the BEPS Action 13 final report (2015). Chapter I addresses functional analysis and the accurate delineation of transactions, which documentation must reflect. Chapter II governs method selection, and Chapter III addresses comparability, both directly relevant where, as in Iceland and Delmonte, the choice of method and cost base are contested. EU Member States are additionally subject to the EU Code of Conduct on transfer pricing documentation and, for dispute resolution, the EU Arbitration Convention and Directive 2017/1852.

Courts assess whether documentation was prepared contemporaneously, whether it accurately reflects the functional and risk profile of the tested entity, and whether the chosen method and comparables are properly applied. The EET Group litigation in Denmark demonstrates that even where documentation exists, an authority may still succeed if the underlying economic analysis is flawed. Key contested questions include the adequacy of the cost base, the appropriateness of the tested party, and whether the documented characterisation matches commercial reality.

Inadequate or flawed documentation materially increases audit risk and shifts the burden of proof to the taxpayer; practitioners must treat documentation as both a technical compliance requirement and the primary line of defence against adjustment.