Customs Valuation and Related Parties: What the Test Requires and Where the Exposure Sits

Customs valuation related parties is the area of customs compliance where pricing decisions within multinational groups meet an independent and demanding legal standard. When two companies in the same group trade with each other, customs authorities do not accept the internal price at face value. The transaction value method, which applies to over 90% of all commercial importations liable to ad valorem duty, requires the importer to demonstrate that the relationship between buyer and seller did not influence the price. That demonstration requires specific evidence, and its absence is a common and costly compliance gap.

Trade between related companies is estimated to amount to approximately 60% of global trade. The scale of that trade and the compliance challenges it generates make customs valuation of related party transactions a priority area for customs authorities in most major trading jurisdictions.

This article addresses the customs valuation requirements that apply when an importer is related to the seller of the goods. It does not address transfer pricing for direct tax purposes, which is a separate discipline governed by different rules.

Who Is a Related Party for Customs Purposes

The definition of related parties for customs purposes is set out in law and is specific. In the United Kingdom, Regulation 128 of the Customs (Import Duty) (EU Exit) Regulations 2018 defines related persons as those where one is an officer of the other, they are partners in the same business, one is an employee of the other, one controls the other’s business, the same person controls both businesses, they jointly control a third person’s business, or they are members of the same family (HMRC, Customs Valuation Method 1: Transaction Value, GOV.UK, updated April 2026). Control includes holding 5% or more of voting rights. The World Trade Organisation (WTO) Agreement on Customs Valuation contains an equivalent definition at Article 15.4, which applies across WTO member jurisdictions. The EU Union Customs Code applies the same framework under Article 127 UCC DA.

Being related does not automatically disqualify the transaction value. The fact that a buyer and seller are related is not in itself grounds for regarding the transaction value as unacceptable. The examination is triggered when customs has grounds for doubt about the declared price, not as a matter of routine.

A significant practical point established by the Court of Justice of the European Union is that relatedness is a substance-over-form test. In Baltic Master UAB v Muitines departamentas prie Lietuvos Respublikos finansu ministerijos (Case C-599/20, CJEU, 2022), the court confirmed that parties can be treated as related on the basis of de facto control even where no formal ownership link or contractual control relationship exists. Where objective circumstances show a close relationship of trust combined with one party’s actual ability to constrain or direct the other, or a third party’s ability to direct both, customs authorities may treat the parties as related regardless of the absence of documentary evidence of legal control. 

The practical implication is that the absence of a shareholding or a formal control contract does not protect an intercompany pricing arrangement from related party scrutiny if the commercial relationship functions like control in practice. Exclusive distribution agreements, long-term sole-source supply relationships, and closely coordinated commercial operations have all been treated as indicators of de facto relatedness by customs authorities applying this test.

What Customs Authorities Are Looking For

Customs authorities examining a related party transaction are asking one central question: has the relationship between buyer and seller influenced the price, or did the parties trade with each other as though they were not related?

HMRC sets out three ways in which an importer can demonstrate that the price was not influenced by the relationship (HMRC, Method 1 – Transaction Value). The importer can show that they and the exporter trade with each other at arms’ length as though they are unrelated. The importer can show that they pay the same price as unrelated buyers operating at the same commercial level and purchasing similar quantities. Or the importer can show that the price is full value, representing a commercial sale where both parties acted independently without influencing the transaction value.

Additionally, Article 1.2(b) of the WTO Agreement provides a test values route: the importer demonstrates that the declared customs value closely approximates the transaction value of identical or similar goods sold to unrelated buyers, the deductive value based on the resale price in the importing country, or the computed value based on cost of production plus profit (WTO Customs Valuation Agreement, Article 1.2(b)). In practice, this route is rarely available for goods traded within multinational groups because they are frequently unique and not sold to unrelated buyers, making comparable price data unavailable (World Customs Organisation Guide to Customs Valuation and Transfer Pricing, 2018 edition, Chapter 2.2).

The circumstances that lead customs authorities to form doubts about a related party price are illustrated by OGL Food v Direktor na Teritorialna direktsia ‘Mitnitsa Plovdiv’ pri Agentsia ‘Mitnitsi’ (Case C-770/21, CJEU, 2023). In that case, the court confirmed that long-term recurring high-value trading patterns, a declared price materially higher than the standard import value for comparable goods, a loss-making resale pattern further down the chain, and a failure to produce the underlying commercial contract are all relevant factors in assessing whether a relationship influenced the price. Although the case arose within the EU entry-price system for fruit and vegetables, the court’s reasoning, that declared price versus resale economics is a red flag customs authorities can use to challenge pricing, applies more broadly.

The practical implication is that a declared customs value which is commercially inconsistent with the subsequent resale price in the importing country, or which cannot be supported by the underlying commercial documentation, creates grounds for a customs authority to question the price regardless of whether the relationship is formally established. The importer who cannot produce the commercial contract and cannot explain the relationship between the declared price and the resale economics is in a materially weaker position than one who can.

The Importer Carries the Entire Evidential Burden

Before addressing what evidence is required, the allocation of burden must be understood clearly. Customs authorities are not obligated to consider transfer pricing documentation at all in determining customs value. An importer referring to transfer pricing documentation prepared for tax purposes as the basis for the declared customs value is not entitled to have that documentation accepted or even considered. The decision rests entirely with the customs authority, on a case by case basis.

The World Customs Organisation (WCO) Technical Committee on Customs Valuation confirmed in Commentary 23.1 that information contained in a transfer pricing study may be useful to customs when examining related party transactions, on a case by case basis: “the use of a transfer pricing study as a possible basis for examining the circumstances of the sale should be considered on a case by case basis. As a conclusion, any relevant information and documents provided by an importer may be utilized for examining the circumstances of the sale. A transfer pricing study could be one source of such information” (WCO TCCV Commentary 23.1, paragraphs 8–9). HMRC similarly states that it may take account of transfer pricing studies conducted by independent third parties when considering whether a transaction is fully costed, but is not obliged to do so (HMRC, Method 1 – Transaction Value).

The burden is on the importer to identify which information in any documentation submitted is relevant to the customs question and to present it in a form the authority can use. If HMRC has grounds to consider the price was influenced by the relationship, it must tell the importer those grounds and give a reasonable opportunity to respond.

How Customs Valuation and Tax Documentation Differ

Two specific differences between customs valuation requirements and transfer pricing documentation are well established and must be understood before submitting any documentation to support a related party customs value.

Customs requires a correct value for each individual consignment at the time of importation. Transfer pricing documentation often operates at an aggregate level across reporting periods. Where a transfer pricing study covers a range of products or a full accounting period, customs must be satisfied that the information is directly relevant to the specific goods imported and the specific consignment being examined.

Additionally, where an importer’s pricing model is designed to set prices retrospectively, for example where the final price is determined by reference to a target margin achieved after the goods have been sold, there may be no definitive transaction value at the time of importation. In that case Method 1 cannot be used and other valuation methods must be applied.

What Must Be Included in the Customs Value

Whether or not a related party examination is triggered, the customs value must include all elements that form part of the transaction value. These additions apply equally to related and unrelated party transactions and are frequently overlooked in intercompany pricing arrangements.

Transport and insurance costs to the point of entry must be included. Assists, meaning materials, tools, moulds, designs, and development work supplied by the buyer to the seller free of charge or at reduced cost, must be included where they have not already been reflected in the price. Royalties and licence fees related to the goods being valued must be included where they are a condition of sale. Selling commissions, as distinct from buying commissions, must be included.

In related party transactions, management fees, technology fees, shared service charges, and other intercompany charges paid alongside the goods price require specific analysis to determine whether they represent elements that should be included in the customs value or services genuinely delivered to the buyer that are properly excluded. The key distinction is between payments that are a condition of the sale of the goods and payments for services delivered to the buyer that are not connected to the goods transaction.

The importer bears the burden of documenting that distinction with specificity. It is insufficient to rely on a cost allocation agreed for tax purposes. Documentation must identify what was paid for goods, what was paid for services, and among the services, which were delivered to the buyer and which were consumed by the seller in connection with the production of the goods.

Post-Importation Price Adjustments: The Hamamatsu Principle and Its Limits

A specific and frequently overlooked customs valuation consequence of related party pricing arrangements is the post-importation price adjustment. Where the intercompany price is subject to adjustment after importation, the customs valuation implications depend critically on the nature and mechanism of that adjustment. The Court of Justice of the European Union has addressed this directly, and the consequences for multinational importers are material.

In Hamamatsu Photonics Deutschland GmbH v Hauptzollamt München (Case C-529/16), the court addressed an arrangement where a German subsidiary imported optical devices from its Japanese parent under a price structured as a provisional invoiced amount combined with a year-end adjustment under a residual-profit-split methodology. The direction and amount of the year-end adjustment, whether the price would increase or decrease, was not known at the time of importation. It depended on the group’s actual results for the accounting period. The CJEU ruled that such an arrangement cannot form the basis for the customs value. The customs value must be fixed and verifiable at the time of importation. A price that can move up or down depending on results that are unknown at the point of import does not satisfy that requirement.

The implications of Hamamatsu extend well beyond its specific facts. Many multinational groups operate intercompany pricing arrangements that use precisely the mechanism the court rejected: a provisional price at importation, trued up at year-end through a credit note or adjustment invoice to achieve a target margin, with the direction of the adjustment unknown in advance. Hamamatsu establishes that this structure, applied without modification to customs declarations, does not produce a valid customs value. The consequences are post-clearance correction obligations, potential duty assessments for upward adjustments, and an asymmetric risk for downward adjustments: where a downward adjustment reduces the price paid, customs authorities in most jurisdictions do not automatically repay the duty difference, while upward adjustments that increase the price are generally treated as creating additional duty liability. The risk does not therefore balance out.

The CJEU subsequently clarified the boundary of the Hamamatsu principle in Tauritus (Case C-782/23). Where a provisional price is used at importation and the final price is determined by objective criteria agreed by the parties before importation and beyond their control, the transaction value method remains applicable. A supplementary declaration should be filed once the final price is established. The court explicitly distinguished this from Hamamatsu on the basis that the adjustment in that case was driven by a profit allocation determined by one party after the fact, not by pre-agreed objective factors independent of the parties’ commercial results.

The distinction between the two cases provides a practical framework for Finance Directors structuring intercompany pricing arrangements. Where the pricing mechanism is based on objective criteria agreed before importation and determinable by reference to factors outside the parties’ control, the transaction value method can be maintained with a supplementary declaration filed when the final price is known. Where the mechanism involves a retrospective profit allocation or a year-end true-up whose direction is not known at importation, the transaction value method is unavailable and the customs value must be established by alternative means from the outset.

The practical responses available to multinational importers include simplification agreements with customs authorities, provisional and definitive declaration procedures where the jurisdiction permits them, and a review of whether the pricing formula itself can be restructured to produce a determinable price at the time of importation. These are customs procedural decisions that should be addressed before any pricing arrangement is implemented.

Where a downward adjustment to the customs value is established and a refund claim is appropriate, the applicable time limit should be verified against current guidance. A blanket 12-month cut-off is not necessarily valid following X BV v Staatssecretaris van Financiën (Case C-661/15, CJEU, 2017), in which the CJEU declared the 12-month time limit in Article 145(3) of the Implementing Regulation invalid to the extent it conflicted with the longer three-year repayment period available under Article 236 of the Community Customs Code. Claims that might otherwise appear time-barred should be assessed against current guidance before being abandoned.

What Finance Directors and CFOs Need to Have in Place

Three practical actions follow from the customs valuation framework for related party transactions.

The first is a review of what is included in the declared customs value for each related party import. The intercompany invoice price is the starting point, not the endpoint. Assists, royalties, transport, insurance, and selling commissions must be assessed separately and included where required. Intercompany service charges paid alongside goods must be reviewed against the distinction between elements that form part of the customs value and services genuinely delivered to the buyer.

The second is documentation of how the intercompany price was determined. The importer must be able to show that the price was not influenced by the relationship. That documentation should address the specific goods imported and the specific period in question, and demonstrate one of the three routes to acceptability recognised by customs: that the parties traded as though unrelated, that the price matches what unrelated buyers pay, or that the price is full commercial value. The commercial contract underlying the transaction should be available, given that its absence has been identified by the CJEU as a relevant factor in assessing whether a price is reliable.

The third is an assessment of any intercompany pricing arrangements that include post-importation adjustments. Following Hamamatsu and Tauritus, the critical question is whether the final price is determined by objective criteria agreed before importation or by a retrospective profit allocation. Where the mechanism falls into the latter category, the customs valuation approach must be reconsidered before the arrangement is implemented, not after a customs authority has identified the discrepancy.

The burden of evidence in all three areas rests entirely with the importer. Customs authorities are not required to accept or even consider documentation submitted by the importer: the decision rests with the authority on a case by case basis. 

For the full framework of customs valuation methods and where the compliance exposure sits across different transaction types, the Customs Valuation article (in Related Articles below) sets out the detail. For the audit mechanisms through which customs authorities challenge valuation positions and why documentation gaps are the most common source of reassessment, the Customs Audit Risk article addresses those questions directly.

If you would like to assess your customs valuation position for related party transactions, feel free to reach out directly.