Transfer Pricing and Customs: Coordination Under a Shifting Tariff Regime

A single intercompany cross-border sale of goods is subject to two separate tax regimes. Income tax authorities apply transfer pricing rules to determine whether the price reflects an arm’s length result. Customs authorities apply customs valuation rules to determine the dutiable value of the imported goods. The two regimes share an underlying interest in market-based pricing, but they are administered by different authorities, follow different valuation hierarchies, and create incentives that often pull in opposite directions. This article addresses the coordination of transfer pricing and customs valuation in the context of cross-border related-party transactions, with particular attention to the current US tariff environment as of early 2026 and to the First Sale for Export rule that remains a significant point of intersection between the two regimes. The discussion is US-led, with brief reference to OECD-aligned international practice where relevant.

Two Regimes, One Transaction

When a US importing entity buys finished goods from a related foreign affiliate, both the income tax and the customs regimes apply to the same transaction. The income tax authority (the IRS) examines whether the import price is consistent with the arm’s length principle under IRC Section 482; the customs authority (US Customs and Border Protection) examines whether the declared customs value is consistent with the customs valuation rules under 19 USC §1401a, which implements Article VII of the General Agreement on Tariffs and Trade and the WTO Customs Valuation Agreement.

The conceptual overlap is real. Both regimes are concerned with whether the price between related parties reflects what unrelated parties would have agreed in comparable circumstances. The customs framework explicitly recognizes that transaction value (the first method in the customs valuation hierarchy) can be used for related-party transactions where the relationship has not influenced the price, and Customs will accept evidence of this in part by reference to test values that approximate arm’s length results.

The differences are also real. Customs valuation focuses on the price actually paid or payable for the imported goods at the time of importation, with specific statutory adjustments. Transfer pricing examines the broader functional and risk profile of the parties and considers a wider range of methodologies, including the Transactional Net Margin Method (TNMM) and the Comparable Profits Method (CPM), which test profit margins rather than prices. A transfer pricing analysis can therefore conclude that the relationship has not influenced the price even where the customs value would be tested differently, and vice versa.

Asymmetric Incentives

The two regimes create incentives that frequently pull in opposite directions. From a customs perspective, a lower import value reduces the duty payable. From an income tax perspective, the direction of pressure depends on the entities involved, but for a US importing entity with a higher tax rate than its foreign supplier, a higher import cost reduces US taxable income and shifts profit out of the US jurisdiction.

A taxpayer is therefore caught between two authorities that may disagree about the correct price for the same transaction, and where intercompany prices set with one regime in mind can create exposure under the other. A price that minimizes customs duty may produce a transfer pricing adjustment in the foreign jurisdiction (where the supplier is now under-compensated relative to its functions). A price that maximizes US transfer pricing comfort may produce a customs challenge if the import value appears inflated relative to comparables.

The practical implication is that intercompany pricing for goods cannot be set with one regime in mind and the other ignored. Coordination between the two functions is required, ideally embedded in the design of the intercompany pricing methodology rather than addressed reactively after an issue has arisen.

Year-End Adjustments and the Customs Treatment Problem

A specific friction arises around year-end transfer pricing adjustments. A multinational group may set provisional intercompany prices during the year and adjust those prices at year-end to align the tested party’s results with the targeted arm’s length range. From a transfer pricing perspective, this is standard practice. From a customs perspective, it raises an immediate question: does the year-end adjustment change the customs value of the goods that were imported during the year?

The answer under US Customs practice depends on the structure of the adjustment. Customs has long taken the position that for an adjustment to be recognized as part of the customs value, the original transaction must have contemplated the adjustment, the adjustment must be objectively quantifiable, and the taxpayer must have committed to the adjustment mechanism in advance of importation. CBP guidance, including its 2012 ruling on transfer pricing post-importation adjustments, sets out the framework. A purely retroactive adjustment that was not foreseen at the time of importation generally does not affect the customs value, leaving the importer in a position where the adjustment has been made for income tax purposes but the customs value remains unchanged. An adjustment that meets the prerequisites can result in either a refund (where the adjustment reduces the value) or an additional duty payment (where it increases the value), but the documentation requirements are specific and the timing matters.

The practical implication is that taxpayers using year-end adjustments should design the adjustment mechanism with customs treatment in view from the outset, including written intercompany agreements that contemplate the adjustment, formula-based adjustment provisions tied to objectively measurable criteria, and contemporaneous records demonstrating that the adjustment mechanism was in place before importation.

The Current US Tariff Environment

The customs side of this analysis has become substantially more consequential since 2025. The Trump administration imposed broad-based tariffs under the International Emergency Economic Powers Act (IEEPA) beginning in early 2025, including reciprocal tariffs on imports from most trading partners and additional tariffs on imports from China, Canada, and Mexico. These tariffs were challenged in the Court of International Trade and on appeal, and on February 20, 2026, the Supreme Court ruled 6-3 in Trump v. V.O.S. Selections that IEEPA does not authorize the president to impose tariffs. The IEEPA tariffs were therefore invalidated. CBP launched the Consolidated Administration and Processing of Entries (CAPE) portal in April 2026 to process refund claims for duties collected under the IEEPA tariffs.

The administration responded immediately to the Supreme Court ruling. A 10% global tariff under Section 122 of the Trade Act of 1974 took effect on February 24, 2026; this authority is limited to 150 days and expires in late July 2026 absent Congressional extension. New Section 232 tariffs on national-security grounds took effect April 2, 2026, with rates of up to 50% on steel, aluminum, and copper, 25% on autos and semiconductors, and up to 100% on certain pharmaceuticals. Two new Section 301 investigations opened in March 2026, one targeting structural excess capacity in roughly sixteen major trading partners and one addressing forced labor enforcement in approximately sixty economies; tariffs resulting from these investigations are expected later in 2026. The pre-existing Section 301 tariffs on imports from China, ranging from 7.5% to 100% depending on the product category, remain in place.

The net effect for a typical US importer is that the headline tariff exposure has shifted substantially over the last twelve months and continues to shift. The legal foundation for tariffs has moved from IEEPA (now invalidated) to a combination of Section 122 (temporary), Section 232 (sectoral), and Section 301 (under investigation). The directional pressure from this environment on transfer pricing and customs coordination is consistent: when tariffs are higher, the value of every percentage point of import-value reduction is greater, the incentive to scrutinize related-party pricing is stronger, and the cost of getting customs and transfer pricing out of alignment is larger.

The First Sale for Export Rule

Among the techniques available to importers managing duty exposure, the First Sale for Export rule remains one of the most directly relevant to transfer pricing. The rule permits an importer to use, for customs valuation purposes, the price paid in an earlier sale in a chain of transactions, provided that the earlier sale was a bona fide sale for export to the United States.

The structure typically involves three parties: a foreign manufacturer, a foreign or related middleman or principal, and the US importer. In a standard intercompany structure, the manufacturer sells to the middleman at one price, and the middleman sells to the US importer at a higher price that reflects additional functions, risks, or markup. Under the default customs rule, the customs value would be the price paid by the US importer to the middleman. Under First Sale, where the prerequisites are met, the customs value can be the lower price paid by the middleman to the manufacturer.

The prerequisites for First Sale treatment are well-established but specific. The earlier sale must be a sale for export to the United States, meaning the goods must have been clearly destined for the US market at the time of that sale. The earlier sale must be conducted at arm’s length, meaning either between unrelated parties or between related parties with the relationship not influencing the price. The middleman must have taken title and assumed risk of loss with respect to the goods. And the documentation must demonstrate the foregoing, including manufacturer-to-middleman invoices and contracts, evidence of US-bound shipping, and records supporting the arm’s length nature of the manufacturer-to-middleman price.

The transfer pricing implications are direct. Where First Sale is applied, the customs value depends on the price between the manufacturer and the middleman. This price must itself be defensible under transfer pricing principles, and the documentation supporting it serves both customs and transfer pricing purposes. A First Sale structure that produces a low manufacturer-to-middleman price for customs purposes but cannot be defended under arm’s length principles is exposed on both regimes simultaneously: the customs claim may be denied for failure of the arm’s length prerequisite, and the transfer pricing position is independently exposed.

In practice, First Sale becomes more attractive as tariffs rise, because the duty saved on each transaction is greater. The current US tariff environment makes the rule more relevant than at any point in recent decades. Multinational groups with multi-tier supply structures and significant US imports should evaluate whether First Sale is available given their existing structure and whether restructuring to enable First Sale treatment is worth the operational cost.

Other Practical Coordination Strategies

Several additional practical strategies arise at the intersection of transfer pricing and customs.

Documentation alignment is fundamental. The transfer pricing file and the customs declarations should tell a consistent story about the same transactions. Inconsistencies between the functional analysis in a transfer pricing study and the description of the import transaction in customs filings are a recurring source of audit issues.

Advance rulings can be used where the customs treatment of a particular structure is uncertain. CBP issues binding rulings on customs valuation questions, and these can provide a degree of certainty that is otherwise difficult to obtain.

Reconsideration of intercompany pricing in light of higher tariffs may be warranted. A pricing structure that was optimal at low tariff rates may not be optimal at higher rates, and the transfer pricing analysis itself may need to consider tariff costs as part of the functional and risk profile of the entities involved. Where a tariff increase substantially changes the economics of a particular intercompany supply arrangement, this can affect the appropriate margin for the tested party.

Coordination across functions within the multinational group is increasingly important. Tax, customs, legal, and supply chain functions historically have operated in separate silos. The current tariff environment, combined with the structural overlap between transfer pricing and customs, makes that separation costly. Groups that have unified or closely coordinated these functions are generally better positioned to respond to tariff developments than those that have not.

A Brief Note on International Practice

Outside the United States, the structural coordination problem between transfer pricing and customs is the same, although the specific rules vary. The WTO Customs Valuation Agreement is the framework adopted by most major economies, and the OECD has acknowledged the interaction with transfer pricing in its work, including a 2015 OECD/WCO joint guidance. Some jurisdictions have moved further toward formal coordination than others, and a small number have advance pricing arrangements that explicitly cover both regimes. For multinational groups with operations in multiple jurisdictions, the practical answer is that the coordination problem must be addressed jurisdiction by jurisdiction, with the United States currently the most active environment given the 2025-2026 tariff developments.

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