Customs Valuation Beyond the Invoice: Assists, Royalties, and Related-Party Prices

The commercial invoice tells CBP what the buyer paid the seller. It does not, by itself, tell CBP the dutiable value of the goods. Under 19 U.S.C. 1401a, the primary method of appraisement is transaction value, defined as the price actually paid or payable for merchandise sold for export to the United States, plus a fixed list of statutory additions that are not always printed on the invoice. 

Three of those additions are where importers most often understate value and where CBP most often opens a valuation review: buyer-supplied assists, royalties and license fees tied to the sale, and prices set between related companies. Each is treated below under the statute and CBP rulings, along with what happens when transaction value fails and the mistakes that turn a routine entry into a CF-28 request for information.

What Counts as Customs Value Under 19 U.S.C. 1401a

Transaction value starts with the price actually paid or payable, defined as the total payment, direct or indirect, that the buyer makes to or for the benefit of the seller, exclusive of international freight, insurance, and related services. CBP's regulation at 19 CFR 152.103 confirms that this price is taken without regard to how it was derived, so discounts, formulas, and negotiated arrangements are all part of it. Indirect payments count too, such as the buyer settling a debt the seller owes to a third party, even though that never appears as a line item.

To that price, the statute requires five additions when they are not already included and can be supported by sufficient information:

The list is closed: No amount outside these five categories may be added, and every addition must rest on objective, quantifiable data. Transaction value is also only usable when four conditions hold: no disqualifying restrictions on the buyer's use of the goods, no condition of sale whose value cannot be determined, no unadjusted resale proceeds accruing to the seller, and buyer and seller either unrelated or passing CBP's related-party tests. Fail a condition, or lack the information to quantify a required addition, and transaction value drops out, sending CBP down the valuation hierarchy.

How Buyer-Supplied Assists Raise Dutiable Value

An assist is anything of value the buyer supplies to the seller, directly or indirectly, free of charge or at reduced cost, for use in producing or selling the imported goods for export. Because the seller never paid for it, its value is not in the invoice price, which is why the statute pulls it back in. The definition in 19 CFR 152.102 sets out four categories:

• Materials, components, parts, and similar items incorporated in the finished goods.

• Tools, dies, molds, and similar items used to produce the goods.

• Merchandise consumed in production.

• Engineering, development, artwork, design work, and plans and sketches undertaken outside the United States and necessary to produce the goods.

That last category carries a carve-out that trips up importers in both directions. Engineering or design work performed in the United States is generally not a dutiable assist, while equivalent work performed abroad and handed to the factory free of charge usually is. A US company that ships its own tooling or overseas-developed drawings to a contract manufacturer has very likely created an assist.

Valuing an assist depends on how the buyer obtained it. For physical assists bought from an unrelated supplier, the value is the acquisition cost including transportation to the place of production; for assists the buyer produced in-house or through a related party, it is the cost of production. Tools and molds the buyer has used before must be written down for prior use, and a leased asset is valued at the cost of the lease.

Apportionment is where the discipline shows. Under 152.103(e), the assist's value must be spread across the imported merchandise reasonably and consistent with generally accepted accounting principles. CBP's mold example makes the flexibility concrete: if a buyer contracts for 10,000 units and 4,000 have been produced by the time the first 1,000-unit shipment leaves, the importer may apportion the mold's cost over 1,000, 4,000, 10,000, or another GAAP-consistent quantity. The method matters less than the records behind it. Buyer-funded tooling, equipment, and overseas engineering are among the most common triggers for a value adjustment, and each turns on paperwork the importer must produce on demand.

When Royalties and License Fees Are Dutiable

Royalties and license fees are dutiable when they relate to the imported goods and the buyer must pay them, directly or indirectly, as a condition of the sale for export to the United States. The regulation draws a working distinction: royalties for patents covering the process used to manufacture the goods are generally dutiable, while royalties paid to third parties for US use of copyrights and trademarks are generally non-dutiable selling expenses. Dutiability is decided case by case, based on what the fee buys and whether payment conditions the sale.

CBP's analysis, articulated in the Hasbro II General Notice and applied in rulings since, runs a three-part test:

1. Was the imported merchandise manufactured under patent?

2. Was the royalty or license fee involved in the production or sale of the imported merchandise?

3. Could the importer buy the product without paying the fee?

Yes to the first two and no to the third point for a dutiable royalty, because the fee conditions the sale. Two rulings show it: HQ W563404 (royalties on patented thermal cyclers flowing to a US patent holder) and HQ W548692 (royalties on patented technology inside pointing devices paid to an unrelated third party). In each, the goods were manufactured under patent, and the importer could not buy them without paying, so the royalties were dutiable. Where a fee pays for the patent or essential technology without which the goods cannot be made or sold as intended, paying a third party does not save it from duty.

The non-dutiable side looks different. In HQ H174030, a retailer paid an unrelated licensor for trademarks and designs, calculated as a percentage of the invoice cost of goods from unrelated suppliers; CBP held the goods were not made under patent, the royalty paid for US trademark use rather than production, and the importer could buy without it, so it was a non-dutiable selling expense. HQ H077419 reached the same result for fees to sell branded footwear domestically, billed separately from the factory invoices, where the licensor had no say over the choice of manufacturer.

The category stays unsettled at the edges: HQ 546513 found footwear license fees dutiable because licensor approval was required for manufacturers, designs, and sales. A royalty labeled a trademark fee is not automatically safe; what governs is whether paying it conditions getting the goods, not the label on the invoice.

Why Related-Party Prices Face the Closest Review

When buyer and seller are related, CBP does not throw out the invoice price, but it does test whether the relationship influenced it. The statute accepts a related-party transaction value in two ways: the circumstances of the sale show the relationship did not affect the price, or the price closely approximates one of several test values. CBP will not disregard a price solely because the parties are related; it examines how the relationship is organized and how the price was set.

The circumstances-of-sale approach asks whether the related parties dealt with each other as unrelated parties would. CBP looks at whether the price is consistent with normal industry pricing, whether it matches how the seller prices to unrelated buyers, and whether it lets the seller recover all costs plus a profit equivalent to its overall profit on merchandise of the same class or kind. Two rulings mark the boundary. In HQ 546979, a US distributor's transfer pricing had been approved under a bilateral Advance Pricing Agreement that CBP joined at the pre-filing stage; because the buyer's profit fell within the APA's arm's-length range, CBP accepted the transaction value. In HQ 548482, a fruit importer relied on a Comparable Profits Method study without IRS approval and without showing the seller recovered costs plus a normal profit, so CBP declined the price.

The gap between those outcomes is the lesson: a transfer pricing study built for income tax is relevant but not dispositive for customs. Tax authorities test the buyer's profitability; CBP wants to see the seller recover costs plus profit on goods of the same class or kind.

The test-value route offers a second path. An importer can show its price closely approximates the transaction value of identical or similar merchandise sold to unrelated buyers, or a deductive or computed value for such goods, with CBP adjusting for differences in commercial level, quantity, and the statutory additions. No fixed percentage counts as "closely approximates"; the answer depends on the industry, seasonality, and the goods. Related-party pricing is the category where importers most often assume acceptance and most often cannot produce the objective evidence CBP asks for when the CF-28 arrives.

What Happens When Transaction Value Cannot Be Used

When a sale fails the transaction-value conditions, when information to quantify a required addition is missing, or when a related-party price cannot be substantiated, CBP appraises the goods under a fixed hierarchy in 19 U.S.C. 1401a(a):

1. Transaction value of identical merchandise, adjusted for commercial level and quantity.

2. Transaction value of similar merchandise, on the same terms.

3. Deductive value, working back from the US resale price in the greatest aggregate quantity, less profit and general expenses, transport, duties, and any value added by processing.

4. Computed value, built up from materials and fabrication, profit and general expenses, assists, and packing costs.

5. Fallback value, derived from the earlier methods with reasonable adjustment.

An importer may elect computed value ahead of deductive value, but only when computed value can be determined. The fallback method is bounded: it may not rest on domestic prices in the country of export, US selling prices, arbitrary or fictitious values, or minimum values. These methods are not inherently punitive or always higher; each carries its own deductions and can land above or below the invoice price. The real exposure is that thin documentation on assists, royalties, or related-party pricing forces CBP onto a less predictable method.

The Understatements That Trigger a Valuation Audit

The failure patterns behind most valuation adjustments are predictable:

• Treating the invoice as the entered value: The invoice omits assists, dutiable royalties, and certain proceeds of resale by design, a point CBP's Customs Value publication makes at length. Declaring it as-is understates value and invites a broader look at prior entries.

• Leaving out buyer-supplied assists: Molds, tooling, production equipment, and overseas engineering given to a factory free of charge are dutiable even though no money moved, one of the most common and documentable understatements CBP finds.

• Assuming all third-party royalties are non-dutiable: A patent or technology royalty that conditions the sale is dutiable regardless of who receives it.

• Relying on a tax transfer pricing study to prove a related-party price: An IRS-oriented study can support a position, but on its own it does not show the seller recovers costs plus a normal profit, which the circumstances-of-sale test requires.

• Failing to apportion and document: A correctly identified assist or royalty still fails if the importer cannot show a reasonable, GAAP-consistent apportionment on demand.

Each is a candidate for a prior disclosure rather than a discovered error. A voluntary prior disclosure filed before CBP opens its own inquiry caps the exposure an unaddressed valuation gap would otherwise carry. Getting there means knowing which entries actually understated value, a data problem before a legal one, and repricing years of entries by hand to surface undeclared assists and royalties is exactly the slow, expert work a tariff audit workflow is built to run at scale.

That expertise is expensive because it is scarce and slow. "I've paid $500/hr to a consultant for something Gaia did in 10 seconds," an Executive Director of Category Management at a freight company told Gaia, describing the kind of classification and valuation determination that used to mean a specialist's billable hours. Compressing that work lets a compliance team review value across a full catalog instead of spot-checking a few entries and hoping the rest hold.

Getting Ahead of a CBP Valuation Review

Valuation exposure is quieter than a misclassified HTS code, and that is what makes it dangerous. An undeclared assist or a dutiable royalty booked as a selling expense sits invisibly across every entry until a CF-28 surfaces it, and by then the understatement spans years. The importers who come through a review cleanly mapped their assists, tested their royalties against the condition-of-sale question, and built related-party evidence before CBP asked. The same scrutiny is intensifying in adjacent areas, including CBP's pressure on first-sale valuation, where the agency's 2026 questionnaire campaign is testing whether declared values hold up. The invoice is where valuation starts; treating it as where valuation ends is the surest way into the audit queue.

Explore Gaia Dynamics to identify undeclared assists, evaluate royalty exposure, validate related-party pricing, and surface customs valuation risks before CBP does. 

Frequently Asked Questions 

Is an assist dutiable if the buyer provided it for free?

Yes, an assist is dutiable because its value is not included in the invoice price. The buyer's acquisition or production cost is added to customs value and apportioned across the imported goods. Common examples include molds, tooling, and overseas engineering. 

Are royalties paid to a third party ever dutiable?

Yes, if paying the royalty is a condition of the sale. CBP considers whether the fee relates to producing or selling the goods and whether the importer could buy them without paying it. Trademark fees for US marketing rights are generally not dutiable. 

Does CBP automatically reject related-party prices?

No. CBP accepts related-party prices if the relationship did not influence the price or if the price closely approximates an accepted test value. The importer must provide objective supporting evidence. 

Can a transfer pricing study prove customs value?

Not by itself. A transfer pricing study can support a customs position, especially when backed by an Advance Pricing Agreement, but CBP still requires evidence that the seller recovered its costs and earned an appropriate profit. 

Are buying commissions added to customs value?

No. Bona fide buying commissions are not dutiable. Selling commissions paid to the seller's agent are added to customs value if they are not already included in the price.