Short answer: customs values your goods on the total economic value of the import, not just the invoice price. If you supplied materials, tooling, or designs to your factory for free or at reduced cost (assists), their value gets added to dutiable value. If you pay royalties or license fees as a condition of buying the goods, those get added too. Missing these additions understates your declared value, which is a valuation violation with penalties that scale to the duty shortfall.
Dutiable value is bigger than the invoice
Most importers think of dutiable value as the price they paid the factory. Customs thinks of it as the full value of the goods as imported, which includes value you contributed outside the invoice. The logic is straightforward: if you gave the factory $50,000 of tooling and paid $100,000 for the finished goods, the goods are worth $150,000 of your economic input, and duty applies to all of it. The invoice is evidence, not the definition.
This is where growing brands get surprised. Early on, the factory supplies everything and the invoice is the whole story. As the brand matures, it starts supplying its own fabrics, its own molds, its own designs, and signing license agreements for branded components. Each of those moves value off the invoice and into the additions that customs expects to see declared. The valuation gets more complex exactly as the volumes get bigger, which is when the penalties hurt most.
Assists: the value you supplied yourself
An assist is anything you provide to the manufacturer for use in producing the imported goods: materials, components, tooling, molds, dies, engineering work, designs, or artwork done outside the country of production. If you supplied it free of charge or at reduced cost, its value is added to the dutiable value of the goods it went into. The addition is apportioned across the shipment the assist was used for.
The practical difficulty is valuation and tracking. A mold that cost $30,000 and produces 100,000 units adds $0.30 per unit, but only if someone tracks which shipments used that mold. Brands that manage assists informally, a tooling invoice here, a fabric shipment there, with no linkage to finished-goods imports, cannot compute the addition when customs asks. The fix is a register: every assist logged with its cost and the production runs it served, maintained as routinely as the purchase orders themselves.
Royalties and license fees: the conditional addition
Royalties and license fees are added to dutiable value when they are a condition of the sale of the imported goods. The classic case: you license a character, logo, or patented technology, pay a royalty per unit to the licensor, and the factory cannot sell you the goods without the license. The royalty is part of what the goods cost you, so it is part of dutiable value. This applies whether you pay the royalty to the factory, to a third-party licensor, or to a related party.
The boundary cases are where disputes arise. A royalty paid for the right to resell the goods in your market, after importation, is generally not dutiable. A royalty tied to the manufacturing process or embedded in the product design generally is. The documentation that decides it is the license agreement: what the royalty is for, when it is payable, and whether the sale could happen without it. Brands should review license agreements for customs language at signing, not at audit.
The documentation customs expects
When customs examines valuation, they ask for the paper trail that connects the additions to the goods: assist registers with costs and apportionment calculations, tooling invoices, license agreements with royalty terms, and the transfer-pricing documentation if any party is related. The standard is contemporaneous records: documents created in the ordinary course of business, not reconstructed after the inquiry arrives.
The most defensible position is a written valuation policy that states how your company identifies assists, apportions them, and treats royalties, applied consistently across shipments. Inconsistent treatment is what turns an adjustment into a penalty: if you added the mold cost in Q1 but forgot it in Q3, customs reads that as negligence at best. Consistency is evidence of reasonable care, and reasonable care is what keeps an adjustment from becoming a fine.
Do assists apply if the factory is a related party?
Yes, and related-party transactions get extra scrutiny because the invoice price itself may not be arm's length. With a related factory, customs examines both whether the price is acceptable and whether all assists and additions were captured. Transfer-pricing documentation and customs valuation documentation should tell the same story.
What if the assist was used for goods sold over multiple years?
Apportion it over the production it served, using a reasonable method: units produced, or value of shipments. A $30,000 mold used for three years of production is apportioned across all three years' imports, not expensed against the first shipment. Document the method and apply it consistently.
Can we just increase the invoice price instead of declaring additions?
No. Rolling assist value into a higher invoice price without documentation obscures the valuation method and creates mismatches with your own books, where the tooling is capitalized separately. Declare the additions transparently with the apportionment shown. Transparency is what survives an audit.