Assists and Royalties in Customs Valuation: What Must Be Added to Transaction Value

CBP Focused Assessments that find customs valuation errors rarely find companies that falsified invoices. They find companies that declared the invoice price accurately. And stopped there. Under US customs law, the invoice price is just the starting point.

The framework under 19 USC § 1401a defines "transaction value" as the price actually paid or payable plus five categories of mandatory additions. Two of those additions, assists and royalties, account for the vast majority of valuation underpayments that CBP finds in audits, and they go unreported for the same structural reason: the people negotiating the tooling contracts and the licensing agreements are almost never the people preparing customs entries.

The Full Transaction Value Formula

Under 19 USC § 1401a(b)(1), transaction value is the price paid or payable for the imported merchandise plus all of the following, if not already included:

(A) Packing costs incurred by the buyer
(B) Selling commissions incurred by the buyer (buying commissions are excluded)
(C) The apportioned value of any assist
(D) Any royalty or license fee the buyer must pay as a condition of the sale
(E) Proceeds of any subsequent resale, disposal, or use accruing to the seller

Items (A) and (B) are typically handled by brokers as routine matters. Item (E) rarely applies to standard commercial imports. Items (C) and (D) are where most undeclared value sits.

The legal structure of this matters. These aren't discretionary additions that importers can choose to include. They're part of the statutory definition of the value on which duties are calculated. Omitting them is a valuation error, and CBP has the authority under 19 USC § 1504 to assess additional duties up to four years after entry.

Assists: What Counts and What Doesn't

An "assist" is defined at 19 USC § 1401a(h)(1)(A) as anything supplied directly or indirectly by the buyer, free of charge or at a reduced cost, for use in connection with producing or selling the imported merchandise for export to the US. Four categories:

Materials, components, or parts incorporated into the imported goods
Tools, dies, molds, and similar items used in producing the imported goods
Merchandise consumed in producing the imported goods
Engineering, development, artwork, design work, plans, or sketches undertaken outside the US

Category 4 is the one most importers overlook. If a US product development team spent six months working with a foreign factory to develop a product's specifications (circuit board layouts, garment patterns, structural engineering) and that work isn't reflected in the factory's invoice price, it's an assist. The producer got real economic value for free, and the customs declaration doesn't reflect it.

Tooling is the most common assist finding in CBP audits. A furniture importer provides $120,000 in woodworking jigs to a Vietnamese factory. An apparel company ships proprietary die-cutting equipment worth $150,000 to its Bangladesh contract manufacturer. A medical device firm sends custom injection molds valued at $80,000 to a Chinese supplier. In each case, the tooling cost appears on the importer's balance sheet as a capital asset, never touches the invoice, and doesn't get reported on the customs entry.

Under 19 CFR § 152.103(b), the value of an assist must be calculated at cost (what it cost to acquire or produce the assist) and then apportioned across the imported merchandise using generally accepted accounting principles. Apportionment is typically done over the total quantity of units produced using the assist. So if the $120,000 mold was used to produce 240,000 units, the apportioned assist value is $0.50 per unit, and that $0.50 must be added to the declared customs value of each unit.

One thing that's consistently misunderstood: related-party transfers don't escape the assist rules. A US parent company that provides tooling to its wholly-owned foreign manufacturing subsidiary still has an assist. The corporate relationship doesn't change the analysis.

Royalties and License Fees: The Condition-of-Sale Test

The royalty analysis under 19 CFR § 152.103(f) turns on one question: was the royalty or license fee paid as a condition of the sale of the imported merchandise?

If yes, it's dutiable. If no, it isn't.

The test sounds clear. In practice, it produces a lot of disputes.

CBP's position in binding rulings, including HQ 547148 on manufacturing-process royalties and W563354 on third-party license fees, is that a royalty is paid "as a condition of sale" when the buyer could not have obtained the imported merchandise without that royalty being paid. This covers:

Manufacturing-process royalties: the foreign producer holds a license (or the buyer holds it on the producer's behalf) for a patented manufacturing process without which the goods couldn't be made. The royalty is paid because the factory can only operate with it. Dutiable.
Product design royalties: the buyer licenses a patented design that the foreign producer incorporates directly into the physical goods. The factory couldn't produce those specific goods without the license. Dutiable.
Third-party licenses that flow through the transaction: the buyer pays a licensor who has no direct contractual relationship with the foreign seller, but the seller couldn't manufacture without the licensed technology. Dutiable, because the chain still links the royalty to the seller's ability to produce.

What's generally not dutiable: trademark, brand name, or copyright royalties that relate to how goods are marketed or sold in the United States after importation. If you pay a brand licensor for the right to use a name on your domestic packaging and advertising, that's a post-import selling expense. The foreign producer could have made and sold the goods to you without it. CBP has consistently treated this as non-dutiable in rulings on downstream brand royalties.

The difficult middle is design royalties that blend both functions: where the licensed intellectual property is incorporated into the product but also controls how it's sold. A designer label on a garment where the licensor's specifications define both the garment's construction and its retail positioning sits in genuinely ambiguous territory. Getting a CBP binding ruling before committing to a valuation position is the right move for arrangements like this.

A Worked Example

A US company imports consumer electronics circuit boards from a South Korean manufacturer. The commercial invoice is $14 per board, and that's what gets declared.

What's not on the invoice:

The company's US engineering team provided $180,000 in circuit schematic files and technical specifications to the Korean factory. This was work done in the US, provided at no charge so the factory could produce to spec. That's a Category 4 assist under 19 USC § 1401a(h)(1)(A).

The company also pays $96,000 per year to a third-party patent holder for a manufacturing process license. Without that license, the Korean factory cannot legally assemble the boards. That's a dutiable royalty under 19 CFR § 152.103(f).

Annual import volume: 400,000 boards.

Assist value per board: $180,000 / 400,000 = $0.45 Royalty per board: $96,000 / 400,000 = $0.24 Undeclared value per board: $0.69

At a 5% duty rate (a typical rate for electronic assemblies under HTS Chapter 85), the duty shortfall is $0.0345 per board. On 400,000 units, that's $13,800 per year.

Over four years, CBP's lookback window produces $55,200 in additional duties. Add interest at the IRC § 6621 rate (running around 7%–8% in recent periods) and a negligence penalty up to 20% of the duty shortfall: another $11,040. Total exposure from a $276 per-unit assist and royalty omission: approximately $66,000 to $70,000 over the lookback period, before any Section 301 or other additional tariffs calculated on the understated value.

For a high-volume import program with ongoing tooling contributions across multiple suppliers, the numbers scale quickly.

Why Importers Miss These

The structural cause is organizational. Assists and royalties are managed by teams that don't touch customs entries.

Tooling goes through engineering and procurement. The purchase order for the mold is capital expenditure. It appears on the fixed-asset register, not the cost-of-goods-sold line, and no one in the approval chain has customs reporting on their radar. The broker sees only the commercial invoice.

License fees go through legal or finance. The royalty agreement is negotiated separately from the supply agreement, sometimes years apart. The royalty payment appears as a line item in the P&L that nobody maps to the imported goods.

Post-import true-ups compound the problem. When a US importer settles transfer prices with a foreign affiliate at year-end, the adjustment often increases the effective cost of goods that were already imported and entered at a lower value. Under 19 USC § 1401a, the "price actually paid or payable" includes amounts paid after importation if they relate to the sale of the goods for export to the US. That year-end transfer pricing adjustment may be dutiable value. But by the time it's calculated, the entries are months old and may have liquidated.

CBP's Focused Assessment program targets customs valuation directly. Assists and royalties appear repeatedly in Focused Assessment findings, and CBP has published guidance on both through its Informed Compliance publications. Importers who have been through a Focused Assessment know this; those who haven't sometimes assume their valuation is fine because their invoices are accurate.

Four Ways to Fix It

Reconciliation entry — the right tool when an assist or royalty can't be precisely quantified at entry time. File a reconciliation flag on the original entry within 21 months of the entry date through ACE. This extends the valuation determination window, letting you declare the final value in a reconciliation submission once the numbers are known, typically after tooling production is complete or after a year-end true-up is settled. The ACE Reconciliation FAQ on CBP.gov explains the mechanics.

Binding ruling request — appropriate when the royalty situation is legally ambiguous: related-party licensing, royalties that serve both manufacturing and downstream marketing functions, or any situation where you're not confident whether the "condition of the sale" test applies. Submit a ruling request to CBP's CROSS system at rulings.cbp.gov. The ruling binds CBP on your entries from the date it's issued. The binding rulings guide explains the process and timeline.

Prior disclosure — if an internal audit reveals that past entries were undervalued because of unreported assists or royalties, a prior disclosure under 19 USC § 1592(c)(4) filed before CBP commences a formal investigation caps the monetary penalty at interest-only on liquidated entries and zero on unliquidated ones. This is a meaningful mitigation compared to a standard negligence finding of up to 2× the duty loss.

Prospective correction — for situations where the analysis is clear-cut and the fix is straightforward, correct the valuation going forward. Then decide separately, based on the size of the exposure and the current audit clock, how far back to go on past entries. An attorney's opinion on the lookback risk is worth getting before that decision.

Key Takeaways

Transaction value under 19 USC § 1401a is not the invoice price. It includes mandatory additions for assists, royalties, and other elements that importers often don't report.
Assists include tooling (dies, molds, jigs, fixtures), materials, and engineering work provided by the buyer to the foreign producer free of charge or at reduced cost. These must be valued at cost and apportioned across the imported merchandise.
A royalty is dutiable when paid as a condition of the sale, principally when the foreign producer couldn't manufacture the goods without the licensed patent or process.
Trademark and brand royalties for post-import US use are generally not dutiable. Manufacturing-process and product-design royalties generally are.
CBP Focused Assessments specifically target valuation. Assists and royalties are among the most common findings.
The 4-year additional-duty lookback under 19 USC § 1504 means past undervaluation compounds significantly on high-volume programs.
The remediation toolkit includes reconciliation entries (flag within 21 months), binding rulings for ambiguous royalty situations, and prior disclosure for discovered past errors.

Correcting your customs value is the first step; knowing the actual duty rate on the corrected value is the second. The HTS code lookup and landed cost calculator give you the current base duty, Section 301, IEEPA replacement, and AD/CVD rates for any code and country, so you can model the full impact before you file.