How to Read a Commercial Invoice for China Imports

U.S. Customs and Border Protection requires a commercial invoice for every formal entry into the United States. It’s not a formality. CBP uses it to decide what duties you owe, whether your shipment gets flagged for exam, and whether your declaration is truthful.

Getting the invoice right before your goods leave China is one of the few things you can control in international shipping. Getting it wrong can delay your clearance by days or weeks, trigger a penalty, or land you in a fraud investigation.

What CBP Uses the Commercial Invoice For

The commercial invoice is CBP’s primary document for two purposes: classification and valuation.

Classification means assigning an HTS (Harmonized Tariff Schedule) code to your goods. That code determines the duty rate. CBP’s officers use your invoice description to verify or challenge the HTS code your broker submitted. If your description says “electronic components” but your actual goods are finished wireless earbuds with a 0% duty rate claimed, the vague description invites scrutiny.

Valuation means determining what your goods are worth so CBP can calculate duties. Most duties are ad valorem, meaning they’re a percentage of the declared value. If you declare a lower value than the goods are actually worth, you pay less duty, but you’re also committing customs fraud.

The invoice also tells CBP the country of origin, which determines whether your goods are subject to Section 301 tariffs (most electronics from China are) and whether any trade agreement duty reductions apply.

Your customs broker uses the commercial invoice to file your entry. Their accuracy is only as good as the document you hand them.

Required Fields on a US-Compliant Commercial Invoice

CBP doesn’t use a single mandated invoice format, but every invoice must contain specific information. Missing any of these fields can hold up your clearance.

The seller’s complete name and address. This is the exporter, typically your Chinese factory or trading company. The address must be their actual physical business address, not a PO box. CBP cross-references this against known entities, and an address that doesn’t match their records raises flags.

The buyer’s complete name and address. This is you, the importer of record. Make sure your legal business name and address on the invoice match exactly what you file with CBP.

The date of exportation. This is the date the goods left China, not the invoice date, not the payment date.

The country of manufacture. For electronics, this is almost always China. If any component was manufactured elsewhere and simply assembled in China, it gets complicated. Ask your supplier to confirm where the goods were actually made, not just shipped from.

A complete description of the merchandise. This is where most commercial invoice problems start. “Electronic parts,” “accessories,” or “consumer goods” are not acceptable descriptions. CBP needs enough detail to classify the goods independently. A good description for a USB-C charger would be: “USB-C Wall Charger, 20W, for consumer electronics, plastic housing, Model XB-20.” Include the product function, material, and key specifications.

Quantities. Units, not just weight. If you bought 5,000 earbuds in 500 boxes of 10 units each, list both the unit count and the carton count.

Unit price and total value. Show the price per unit, then multiply by quantity for a line total. If you bought multiple SKUs, list each as a separate line item with its own price and quantity.

Currency. State the currency explicitly. Most China import invoices are in USD, but if you paid in RMB or another currency, that must be noted and a conversion applied.

Port of loading. Which Chinese port the goods were exported from. Shanghai, Shenzhen/Yantian, Ningbo, Guangzhou, and Qingdao are the main ones for electronics.

Port of destination. The US port where CBP will clear the goods.

Terms of sale (Incoterms). FOB, CIF, EXW, DDP. This affects whether shipping and insurance are included in the declared customs value, which CBP will check.

If your supplier knows the HTS code, it’s helpful to include it on the invoice, though not strictly required. Most suppliers don’t know it, which is fine.

Common Invoice Problems That Delay Customs Clearance

After reviewing plenty of China import entries, the same problems come up repeatedly.

Vague merchandise descriptions are the top problem. “Electronic accessories” could be anything from phone cases to EV components. CBP needs to classify your goods, and if they can’t tell what you imported from the invoice, they’ll examine the shipment. That means your container gets pulled, physically inspected, and cleared on CBP’s schedule rather than yours. Physical exams at major ports can add 5-15 business days to your clearance time.

Value discrepancies from previous shipments. If you imported the same USB hubs three times before at $4.50 each, and this shipment declares them at $2.00 each, CBP notices. Their systems flag statistical outliers. You’ll need to explain the difference, and if you can’t, they’ll assess duties on what they believe the correct value is.

Wrong currency or missing currency notation. If the invoice says “100,000” with no currency symbol, CBP can’t process it. This seems basic, but it’s a common error on invoices from smaller factories.

Missing country of origin. Required by law. Not optional.

Seller address that doesn’t match their actual location. Factories sometimes use a trading company’s address on invoices when the relationship is more complex. If CBP runs the address and it doesn’t map to a known entity in their system, it’s a flag.

The Undervaluation Problem

Some Chinese suppliers will offer to write a lower value on your invoice to reduce the duties you pay. This is an attractive offer. It also exposes you to serious legal and financial consequences.

Customs fraud is the technical term for what this is. The importer of record, meaning you, bears the legal liability. Not the factory. Not the freight forwarder. You signed the entry documents certifying the declared value is accurate.

CBP isn’t naive about this practice. They have access to trade databases that show typical transaction values for specific goods. They know what a 20W USB-C charger from Guangdong normally sells for on Alibaba. If your declared value is 40% below that, it gets flagged.

The consequences aren’t hypothetical. CBP can assess retroactive duties on the correct value, plus interest. They can also issue penalties up to the full value of the goods for negligent violations, and up to four times the unpaid duties for fraudulent violations. For an intentional scheme with a pattern of undervaluation, the matter can be referred to Homeland Security Investigations.

The math on undervaluation rarely makes sense once you include the risk. Section 301 tariffs on electronics run 7.5-25%. Saving 20% on duties sounds meaningful until you calculate what a penalty of the full goods value would cost.

If your supplier insists on invoicing below the actual transaction price, walk away from that request. Document your actual purchase price and declare it.

Assists and What They Mean for Customs Value

An “assist” is anything of value you provided to the foreign seller free of charge or at reduced cost that helped them produce the goods you’re importing. CBP regulations require you to add the cost of assists to your declared customs value.

The most common assists for electronics importers:

Tooling and molds. If you paid for the injection mold that produces the plastic housing for your product, and you gave that mold to the factory, its cost is an assist. If the factory made 10,000 units with that mold, CBP will typically prorate the mold cost across all units and add it to the unit value.

Engineering design work. If you hired a US engineering firm to design a circuit board and gave the design files to the factory, that design work is an assist.

Materials provided free of charge. If you shipped components to China for your factory to incorporate into the finished goods, those components are assists.

Most importers working with ODM (off-the-shelf product from the factory) don’t have assists. But OEM importers who are paying for tooling or custom development often do, and failing to disclose them creates liability.

Talk to your customs broker before your first shipment if any of these apply to your situation.

Packing List vs Commercial Invoice

These are two different documents that both travel with your shipment. Importers sometimes confuse them.

The commercial invoice is the financial document. It shows what you paid, the terms of sale, and the declared value for customs purposes.

The packing list is the physical document. It shows how many cartons are in the shipment, the dimensions and weight of each carton, and which items are in which carton. CBP uses the packing list to reconcile the physical shipment against what was declared. Your warehouse uses it to receive and count inventory.

Both documents are required for formal entry. You’ll also need the bill of lading and, for most electronics, a certificate of conformity or other compliance documentation depending on the product.

Before you release final payment to your supplier, compare the commercial invoice to your purchase order line by line. Check that quantities, SKUs, unit prices, and descriptions all match. Check that the total matches what you authorized. Errors on the invoice are your problem to fix before the goods arrive, not after.

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