First Sale Can Cut Your Duties. Congress Wants It Gone.
First Sale lets importers duty the lower factory price, cutting every tariff layer. It's never been worth more, and a Senate bill wants to kill it.
When tariffs climb, the customs value underneath them matters more than ever. For importers buying through foreign middlemen, the First Sale rule can legally shrink that value, but only when the transaction and the documentation meet CBP's standards. A bipartisan Senate bill introduced this year would take the tool away.
If your goods pass through a foreign middleman before reaching the United States, you are probably paying duties on a higher value than you have to. Under the First Sale principle, a qualifying importer can declare the earlier manufacturer-to-middleman price as the customs value instead of the later price the importer paid, dropping the middleman's markup out of the dutiable base. In a normal-tariff world that was a nice-to-have. With Section 301, Section 232, and the reciprocal duties stacked on top of the base rate, it is one of the few fully legal levers left to cut a duty bill. But First Sale is not a loophole you elect. It is a customs-valuation methodology with a heavy evidentiary burden.
How First Sale works
US customs law bases transaction value on the price actually paid or payable for merchandise sold for exportation to the United States, under Section 402 of the Tariff Act of 1930 (19 U.S.C. § 1401a), plus statutory additions. In a multi-tier transaction, CBP recognizes that an earlier sale can serve as the transaction value. The principle traces to Nissho Iwai American Corp. v. United States and was addressed by CBP in Treasury Decision 96-87. To use it, the importer generally must show that the first transaction was a bona fide sale, that the merchandise was clearly destined for the United States at the time of that sale, that the manufacturer and middleman dealt at arm's length, and that the documentation supports the entire chain. CBP is explicit that the importer carries the burden of proving the first-sale price qualifies, on every entry where it is used.
Why it is worth more when tariffs are high
The economics are simple, and they scale with the tariff stack. Say a middleman buys from a factory for $80 and sells to the US importer for $100. If the $80 first-sale value qualifies and a 35% ad valorem duty applies, the duty is about $28 on $80 instead of $35 on $100, a $7-per-unit saving. The higher your combined ad valorem rate, the larger the prize, which is exactly why interest has surged as tariffs have climbed. One caution worth stating plainly: First Sale does not automatically shave every part of your landed cost. Its actual effect depends on the tariff classification, the applicable trade measures, and the statutory treatment of each charge, so specific duties, certain fees, and dutiable assists may not move with it.
The paperwork is the real test
This is where most First Sale programs fail. CBP presumes the price you paid is the correct value, and it expects evidence capable of reconstructing the whole commercial transaction to rebut that: manufacturer invoices, middleman invoices, purchase orders at both tiers, contracts, proof of payment along the chain, shipping and transportation records, evidence of US destination, documentation of how title and risk moved, and information about the relationship between the parties. CBP has repeatedly stressed that these determinations are highly fact-specific, and having invoices in hand does not guarantee acceptance. In Ruling HQ H337689, issued October 6, 2025, CBP reaffirmed that standard and made clear that contractual terms and Incoterms alone do not establish commercial reality without corroborating records, and in other rulings, such as H327067, it has denied First Sale outright where the middleman never truly took title or risk. Records must be kept for five years and produced on audit.
Related parties, and the disclosure problem
A related-party structure, where the factory and middleman sit in the same group, is not automatically disqualified. US law permits related-party transaction values when the relationship did not influence the price or when the value satisfies the statutory comparison tests, though CBP can demand substantially more evidence, often including transfer-pricing analysis. For unrelated parties, the obstacle is usually not customs at all. To declare the factory price you need the factory's invoice to your middleman, which means the middleman must disclose its margin. That is a procurement negotiation, and it is the step that most often ends a First Sale project before a single entry is filed.
Congress is moving to close it
The development to watch is S.3841, the Last Sale Valuation Act of 2026. Senators Bill Cassidy and Sheldon Whitehouse introduced the bipartisan bill on February 11, 2026, and it was referred to the Senate Committee on Finance. It would amend the same statute, 19 U.S.C. § 1401a, to define "sold for exportation to the United States" as the last sale that introduces the merchandise into the country, which would eliminate or sharply restrict First Sale. Cassidy framed it as ensuring reciprocal treatment and closing a "loophole," echoing the administration's reciprocal-tariff logic. But the bill is not law. It remains in committee, independent trackers put its odds of enactment near zero for now, and CBP's valuation procedures are unchanged, so First Sale remains fully available where the requirements are met. The direction of travel is the point, not the immediate risk.
What this means for you Find your multi-tier transactions. Identify products bought through foreign trading companies, buying agents, or other intermediaries. Run the savings math first. Compare the first-sale value with what you declare today, apply your actual tariff stack, and remember the threshold: it generally pays off above roughly $30,000 in dutiable value per order. Build the evidence file, not the entry. Start from the commercial transaction and reconstruct the full chain, because this is a continuous obligation, not a one-time filing. Nail US destination and the transfer of title and risk. Those are where CBP denies claims. Solve the disclosure problem as a sourcing term. If your middleman will not reveal the factory price, the strategy is dead before it starts. Put S.3841 on your watchlist, but do not wait on it. Capture the value now with a defensible program, and know that a sloppy claim in today's high-tariff, high-enforcement environment invites retroactive duties and penalties.
First Sale is the rare tariff tool that is entirely legal, materially valuable, and within the importer's control, provided the documentation holds. Customs value has become a strategic question, not an accounting afterthought. It rewards importers who treat it as a discipline and punishes the ones who treat it as a shortcut.
This article is informational and is not legal or customs advice. First Sale eligibility depends on the specific facts, parties, transactions, and documentation, and the law may change. Consult a licensed customs broker or trade attorney before implementing or changing a First Sale program.
SOURCES. US customs valuation rests on transaction value under Section 402 of the Tariff Act of 1930, 19 U.S.C. § 1401a (https://www.law.cornell.edu/uscode/text/19/1401a), and the First Sale principle derives from Nissho Iwai American Corp. v. United States and CBP's Treasury Decision 96-87, with the documentary standard and the finding that contractual terms alone are insufficient reaffirmed in CBP Ruling HQ H337689 of October 6, 2025 (https://www.greenworldwide.com/cbp-reaffirms-first-sale-documentation-standards-in-ruling-hq-h337689/); CBP has denied First Sale where title and risk did not transfer, as in Ruling H327067 summarized by Carra Globe, which also details the three qualifying conditions and the savings math (https://carraglobe.com/first-sale-for-export/). The legislative threat is S.3841, the Last Sale Valuation Act of 2026, introduced February 11, 2026 by Senators Cassidy and Whitehouse and referred to the Senate Finance Committee, per the official record on congress.gov (https://www.congress.gov/bill/119th-congress/senate-bill/3841) and the bill text on GovInfo amending 19 U.S.C. § 1401a (https://www.govinfo.gov/app/details/BILLS-119s3841is); Greenberg Traurig summarizes its mechanics and status (https://www.gtlaw.com/en/insights/2026/2/newly-introduced-congressional-legislation-seeks-to-end-first-sale-valuation-potentially-increasing-duties-for-importers), and Maersk's February 20, 2026 client advisory confirms CBP valuation procedures remain unchanged for now (https://sourcealliance.net/proposed-elimination-of-first-sale-customs-valuation-method/).
