Cross-border operations guide ยท October 30, 2026

Customs value in related party sales: when your supplier is also your family

Customs law accepts related party transaction value where the circumstances of the sale show the relationship did not influence the price, or where the value closely approximates an accepted test value. Both routes are evidence exercises. Circumstances of sale evidence includes how the price was set: price lists applied to all buyers, negotiations documented, pricing formulas used across the group, proof the price covers costs plus a profit consistent with the suppliers overall results.

The test is influence, not relationship

Transfer pricing documentation helps and does not decide. A transfer pricing study answers an income tax question, how profit splits between jurisdictions, while customs asks a different question about the price of these goods at import. The two files overlap in facts and diverge in law, and presenting the tax file as if it were the customs answer is a recognised way to lose an argument that could have been won with the right evidence.

The file assembles itself if someone owns it: the supply agreement, the pricing policy, sample negotiations, the suppliers sales to unrelated buyers of the same or similar goods where they exist, and the cost build up for goods sold only within the group. Where the supplier sells only to the group, the cost plus route, production cost plus a profit consistent with the industry, carries more of the load, and the file should say so rather than pretend a market comparison exists.

Build the file before the questions arrive

Revisit the file when pricing changes, not when a review opens. A mid year price cut between related parties, made for sound cash reasons and documented nowhere, is exactly the fact pattern that converts a routine valuation query into a suspicion that price follows the groups convenience. Contemporaneous paper is the whole defence: a pricing decision explained when it was made reads as business, explained two years later it reads as advocacy.

Related party structures breed the additions to value that arm length trades price openly: tooling paid for by the buyer and supplied free to the factory, designs and engineering provided by the parent, raw materials consigned to the supplier, royalties under a group licence. Each can be an assist or an addition to customs value, whether or not money moved at import, and group accounts are where they hide, labelled as head office costs, management fees, or marketing support.

Assists and additions hide in group arrangements

Walk the intercompany agreements with the customs lens once a year: what does the buyer provide the supplier, in goods, work, or rights, that the invoice price does not reflect. The question is uncomfortable and cheap. The same question asked by an auditor comes with a look back over years of entries and interest on the difference.

Rejection moves valuation down the hierarchy: transaction value of identical goods, then similar goods, then deductive and computed methods, applied in order with limited flexibility. The practical consequence is delay and a value set by a method the importer controls less. A protest or ruling strategy can be built, but the stronger move is earlier: a binding valuation ruling or an advance agreement where the jurisdiction offers one, turning the annual argument into a settled position.

If customs rejects the price

Take counsel or broker advice specific to your structure before adopting any position described generally here. Related party valuation is fact dense law, the amounts compound over every entry in the look back period, and the cost of advice is trivial against a reassessment of three years of imports priced on an assumption.

Keep reading: When should an importer file a prior disclosure with CBP?, How do customs broker errors happen, and who pays when an entry is wrong?.

Frequently asked questions

What is a prior disclosure to CBP?

Yes, where the circumstances of the sale show the relationship did not influence the price, or the value closely approximates an accepted test value. Relatedness alone is not disqualifying. Lack of evidence for the price is what fails.

Can I file a prior disclosure after receiving a Form 28?

No. Transfer pricing answers an income tax question about profit allocation. Customs asks whether the price of the imported goods was influenced by the relationship. The studies share facts but answer different legal tests, and customs is not bound by the tax file.

How far back should a disclosure go?

Something the buyer supplies to the supplier free or below cost that goes into the goods: tooling, designs, materials, engineering. Assists can be additions to customs value whether or not they appear on any invoice, and group arrangements are where they most often hide.

Should new entries keep using the old method while a disclosure is prepared?

The pricing policy, price lists applied generally, documented negotiations, the suppliers sales to unrelated buyers where they exist, and a cost build up where they do not. Evidence created when the price was set carries far more weight than explanations assembled during a review.