How Customs Valuation Works for Electronics Imports from China

Duties are calculated as a percentage of your shipment’s customs value. Get the valuation wrong and you either overpay duties or expose yourself to fraud penalties. For electronics importers from China, customs valuation is one of the areas where well-intentioned importers get into serious trouble without realizing it.

What Customs Valuation Actually Means

Customs value is the number CBP uses to calculate how much duty you owe. It’s not always the price you paid. It’s not always the number on your invoice. CBP has specific rules for how to arrive at this number, and those rules apply whether you know them or not.

Duties are ad valorem, meaning they’re a percentage of the declared value. If your electronics shipment carries a 3.5% MFN duty rate plus a 25% Section 301 tariff, you’re paying 28.5% of the customs value. On a $50,000 shipment, a $10,000 undervaluation costs the government about $2,850 in duties. CBP notices patterns like this.

The customs value also affects other things: merchandise processing fees (MPF), harbor maintenance fees, and your import bond. All of them are tied to declared value.

The Six Valuation Methods

CBP uses six methods of valuation, applied in a specific order. The first method applies in the vast majority of real-world transactions.

The first and most common method is transaction value. This is the price actually paid or payable for the goods when sold for export to the United States. For most direct imports, this is your commercial invoice price.

If transaction value can’t be used (for example, there’s no sale between buyer and seller, or the parties are related and the price isn’t arm’s-length), CBP moves to transaction value of identical merchandise. This uses the price of similar goods recently imported from the same country.

If that doesn’t work, transaction value of similar merchandise applies. Same concept, with somewhat more flexibility on what counts as “similar.”

Fourth is deductive value, which works backward from the US resale price. CBP takes what you sell the goods for in the US, subtracts commissions, profit, transport costs, and duties to arrive at an import value.

Fifth is computed value, which builds the value up from the cost of production: materials, fabrication, profit, and overhead at the factory.

Sixth is the fallback method, used when none of the above work. CBP uses “reasonable means” consistent with the principles of the General Agreement on Tariffs and Trade.

In practice, for straightforward electronics imports with a purchase order and commercial invoice, transaction value handles almost every case. The other methods matter primarily for related-party transactions, inter-company transfers, or unusual ownership structures.

Transaction Value: What Gets Added

Transaction value starts with the price on your invoice, but several categories of costs get added to that base price.

Packing costs are added to transaction value. If your supplier charges you separately for export packaging, inner cartons, or palletizing, those amounts are included in the customs value even if invoiced separately.

Selling commissions are added. If you pay a buying agent or sourcing agent who earns a commission from the seller (not just from you), that commission adds to the customs value.

Royalties and license fees get added when they’re related to the imported goods and are a condition of the sale. If you’re paying a royalty to use a brand name or technology that’s built into the electronics you’re importing, CBP may add those royalties to the declared value.

Proceeds of resale matter too. If you’ve agreed to share some of your US resale revenue with the Chinese supplier, that share adds to the customs value.

What Assists Are and Why They Trip Up Importers

An assist is anything you provide to the foreign producer free of charge, or at a reduced cost, that’s used in producing the goods you’re importing.

Common examples in electronics manufacturing: you supply the tooling or molds for injection-molded plastic parts. You provide custom firmware or software loaded on the devices. You supply materials like specialized packaging or branded components that the factory incorporates into the product.

The value of assists must be added to the customs value. If you paid $15,000 to have injection molds made and shipped to your Chinese factory, CBP expects that cost to be apportioned across the goods produced using those molds.

Many importers who work on private label electronics projects supply molds and artwork without reporting these as assists. This is a customs violation. The amounts aren’t trivial. A set of injection molds for a consumer electronics product can easily run $20,000-80,000.

If CBP audits your import activity and finds you’ve supplied tooling to factories without declaring assists, they can assess back duties on the assist value plus interest and penalties.

The practical fix is simple: tell your customs broker when you supply anything to the factory. They’ll help you calculate the prorated assist value and declare it correctly.

Invoice Fraud: A Risk That Falls on You

This is worth addressing directly, because it comes up constantly in China sourcing.

Some Chinese suppliers routinely offer to undervalue the commercial invoice. They’ll write $8,000 on the invoice when you paid $20,000. Their pitch is that you’ll pay lower duties and save money. It sounds like a shared benefit. It isn’t.

Invoice undervaluation is customs fraud. The fraud is committed by the importer, not the supplier. The Chinese factory faces no legal exposure in the United States. You do.

The penalties for customs fraud under 18 USC 542 (importing goods by false statement) include civil penalties up to four times the unpaid duties, criminal penalties up to $250,000, and possible imprisonment. CBP doesn’t need to catch you on every shipment. They can find one instance and audit backward.

CBP has multiple ways to detect undervaluation. They compare your declared values against databases of transaction prices for similar goods imported from China. They can request your bank wire transfer records. They can examine your bank statements, supplier contracts, and email communications. If your declared value is consistently 40% below what similar goods from the same supplier category sell for, it flags for review.

A single electronics shipment undervalued by $30,000 at a combined duty rate of 28.5% represents $8,550 in unpaid duties. Civil penalties can push that to $34,200 plus the original duty. The customs attorney fees to resolve it run $5,000-15,000 minimum.

Don’t do it. And if a supplier proposes it, take that as a signal about how they conduct business generally.

The First Sale Rule

The First Sale rule is a legitimate, CBP-approved method for reducing your customs value when you import through a trading company or intermediary.

Here’s the situation it addresses: a trading company in Shenzhen buys electronics from a factory for $50,000, then sells them to you for $65,000. Normally, you’d declare $65,000 as the transaction value and pay duties on that amount.

Under the First Sale rule, you can declare $50,000 as the customs value, which is the price at the first sale in the supply chain (factory to trading company). The duty savings on a $15,000 difference, at a 25% tariff rate, is $3,750 per shipment.

To use First Sale, you need documentation. You need the factory invoice to the trading company, proof that the goods were destined for US export at the time of that first sale, and records showing the relationship between the parties. Your customs broker can advise on what CBP needs.

For importers buying through trading companies or agents with markup, First Sale is worth calculating on each shipment. At high Section 301 tariff rates, the savings add up fast.

Related-Party Transactions

If you have ownership or control in your Chinese supplier (a joint venture, a direct investment, part ownership), CBP considers you a related party. Related-party transaction values get more scrutiny because the price can be set artificially.

CBP will want to verify that the related-party price reflects arm’s-length market rates, meaning it’s the price you’d pay if you were buying from an unrelated supplier. You can demonstrate this by comparing the price to identical or similar goods sold to unrelated importers, or by showing the value covers production costs plus a reasonable profit.

For importers who have equity stakes in Chinese factories, this is a compliance issue worth getting legal advice on before problems arise.

Proper Invoice Requirements

Your commercial invoice needs to support the declared customs value. CBP has minimum requirements for what a commercial invoice must contain.

The invoice should show the seller name and address, buyer name and address, place and date of sale, country of origin, an itemized description of the goods (not generic categories), the unit price and extended value for each line item, the currency, and the total value.

For electronics, add the model number, SKU, or part number for each line item. Invoices that list “electronic accessories” or “electronic goods” without further description create problems at entry and invite examination.

If your supplier gives you a proforma invoice for payment and a different commercial invoice for customs, those values must match. CBP can request both documents. Inconsistencies are a red flag.

How CBP Reviews and Questions Your Declared Value

CBP doesn’t manually review every entry. Their automated systems flag shipments for examination based on risk scoring. Factors that can trigger a valuation review include declared values well below trade data averages for similar goods, a history of prior valuation questions on your account, inconsistent values across shipments from the same supplier, and entry errors that suggest unfamiliarity with trade regulations.

If CBP questions your declared value, they can issue a CF-28 (Request for Information) or CF-29 (Notice of Action). A CF-28 asks you to provide documentation supporting your declared value. A CF-29 is CBP notifying you they’re changing the value and collecting additional duties.

Respond to CF-28s promptly and completely. Your customs broker handles this. Slow or incomplete responses escalate the situation.

For most straightforward electronics imports with clean documentation, you won’t see these forms. But if your valuations are accurate and your records are organized, responding to one is not catastrophic. The problem comes when the accurate documentation doesn’t exist because the declared value wasn’t accurate.

FAQ

What is customs valuation for electronics imports from China?

Customs valuation is the value CBP uses to calculate import duties. For direct factory imports, this is typically your commercial invoice amount plus any packing costs, assists, royalties, or commissions that CBP rules require to be added.

Is it illegal to ask a Chinese supplier to undervalue the invoice?

Yes. Importing goods on a falsely undervalued invoice is customs fraud. The liability falls on you, the importer, not the Chinese supplier. Civil penalties can reach four times the unpaid duties. CBP detects undervaluation by comparing your declared values against trade databases and requesting bank wire records.

What is an assist in customs law?

An assist is anything you provide to the manufacturer free of charge or at below-market cost that’s used to produce your imported goods. Molds, tooling, software, firmware, and branded packaging you supply to a Chinese factory are all examples. Their value must be declared. Failing to declare assists is a violation.

How does the First Sale rule reduce customs duties?

It lets you declare the factory’s price to the trading company as your customs value, instead of the higher price you paid the trading company. You need documentation showing the factory invoice and evidence the goods were destined for US export at that point.

What does CBP do if they think my declared value is too low?

CBP issues a CF-28 asking for supporting documents like purchase orders and payment records. If not satisfied, they issue a CF-29 to adjust the value and collect additional duties. Serious cases can lead to civil or criminal penalties.

Does customs value include shipping costs?

For US imports, duties are assessed on the FOB value, which excludes international freight and insurance. If your invoice is CIF, your broker subtracts freight and insurance to get the dutiable FOB value. Confirm the Incoterms with your broker.