First Sale Rule: How to Lower Your Customs Value Legally

What Is the First Sale Rule?

Under US customs law, the default method for valuing imported goods is “transaction value” — the price actually paid or payable for the goods when sold for export to the United States. In a simple two-party transaction (factory → importer), the transaction value is straightforward: it's what you paid the factory.

But many supply chains involve intermediaries — trading companies, sourcing agents, or distributors. In a three-tier chain (factory → trading company → importer), there are two sales: the factory's sale to the trading company (the “first sale”) and the trading company's sale to you (the “last sale”). By default, CBP uses the last sale price as the transaction value — the higher price you paid the trading company.

The first sale rule allows importers to request that CBP instead use the first sale price — the lower factory price — as the transaction value for duty calculation purposes. The result is a lower dutiable value and a lower duty bill.

When Does First Sale Apply?

First sale valuation is available when all of the following conditions are met:

• Multi-tier supply chain: There must be at least two sales in the chain — a sale from manufacturer to middleman, and a sale from middleman to you (the importer of record)
• Sale for export to the US: The first sale (factory to trading company) must have been made for export to the United States — not a domestic sale in the country of manufacture
• Ascertainable price: The first sale price must be a real, documented transaction between unrelated parties at arm's length (or if related parties, the price must satisfy CBP's related-party test)
• No adjustments would be required that cannot be documented: Any statutory additions to transaction value (assists, royalties, etc.) must be calculable

The most common scenario: you buy through a Hong Kong or Shanghai trading company. The trading company purchases from a Guangdong factory. You can declare the factory's invoice to the trading company as your customs value, provided you can document it.

How Much Can First Sale Save?

The savings depend on the margin between the factory price and the trading company price. Typical trading company markups range from 10–30%. Applied to China-origin goods with a total effective duty rate of 45%+, the math can be significant:

For high-volume importers, first sale valuation can save tens of thousands of dollars per year — without changing your product, your supplier, or your HTS classification.

Documentation Requirements

This is where most importers fail. CBP will not accept a first sale claim without adequate documentation. At minimum, you need:

Required documents

• Factory invoice to the trading company: Shows the actual price paid in the first sale. Must be a real commercial invoice, not a document created after the fact.
• Trading company invoice to you: The second sale in the chain, showing the markup.
• Proof of payment for both invoices: Bank wire records, letters of credit, or payment confirmations for both transactions.
• Evidence that the first sale was destined for US export: Bill of lading, packing lists, purchase orders, or other documents referencing the US as the final destination at the time of the first sale.
• Proof that the goods were not substantially transformed between the first sale and importation: The factory invoice and import must be for the same goods.

Supporting documents (not always required but helpful in an audit)

• Purchase orders from you to the trading company, and from the trading company to the factory
• Trading company's role: are they an agent (working on commission) or a principal (buying and reselling on their own account)? This affects how CBP evaluates the transaction.
• Any assists you provided: tooling, design files, raw materials supplied to the factory at no charge
• Proof of unrelated-party status (or related-party test documentation if related)

How to Claim First Sale

First sale is not automatic. You must proactively declare it. Here's the process:

• Step 1: Identify shipments where you buy through a middleman and can obtain the factory invoice
• Step 2: Assemble the required documentation for at least the first shipment where you intend to claim first sale
• Step 3: Instruct your customs broker to declare first sale valuation on the entry (line 5 of the CF 7501)
• Step 4: File the entry using the first sale (factory) value as the declared value, attach or retain supporting documentation
• Step 5: Maintain all documentation for at least 5 years — CBP can audit entries within 5 years of liquidation

If you have any uncertainty about eligibility, consider requesting a binding ruling from CBP before implementing first sale across a large volume of entries. A binding ruling (filed through CBP's CROSS system) gives you legal certainty before you claim the valuation.

The Nissho Iwai Decision and Its Significance

The legal foundation for first sale valuation in the US comes primarily from Nissho Iwai American Corporation v. United States, 786 F. Supp. 1002 (Ct. Int'l Trade 1992), affirmed by the Federal Circuit. In that case, the court held that the “transaction value” standard in 19 U.S.C. § 1401a can be applied to the first sale in a multi-tier chain if the goods were clearly destined for US export at the time of that sale.

Subsequent cases, including Generra Sportswear Co. v. United States and various CBP ruling letters (searchable in the CROSS database), have refined the requirements for documentation and established that the “clearly destined for US export” standard is fact-specific and must be demonstrated through contemporaneous documents.

First Sale vs. Other Duty Reduction Strategies

First sale reduces the dutiable value of your goods. It works multiplicatively with HTS classification — a lower value at a lower rate produces the maximum savings. When combined with HTS reclassification (moving from List 3 to List 4A for Section 301 purposes), the compounded savings can be substantial.

If you're paying significant duties, it's worth auditing both your HTS classification and your valuation methodology together. Run a free HTS audit to identify classification opportunities, and discuss first sale eligibility with your customs broker simultaneously.