Tariff planning under scrutiny
Congress is questioning the long‑used “First Sale” customs method that importers use to lower tariff bills, which could raise cost and timing uncertainty for import‑dependent occupiers. Analysts note this sits alongside a broader shift toward enduring tariffs, so importers and 3PLs may rethink inventory and sourcing strategies that currently favor Southern California gateway access. (retaildive.com) (foreignpolicy.com) (cpapracticeadvisor.com) (azernews.az)
The fight is over a dry piece of customs math that suddenly matters a lot. Under the “first sale” method, an importer can base duties on the earlier factory-to-middleman price instead of the higher price the U.S. buyer actually pays. If a manufacturer sells a shirt for $10 to a sourcing company and that company sells it to a U.S. retailer for $15, duties can be charged on $10 rather than $15. U.S. Customs and Border Protection still allows that approach, but only if the importer can show a bona fide earlier sale and prove the goods were clearly destined for the United States (cbp.gov). That rule has been around for decades. What changed is the size of the tariffs sitting on top of it. That is why Congress has started aiming at the rule itself. In February, Senators Bill Cassidy and Sheldon Whitehouse introduced the Last Sale Valuation Act, which would require duties to be calculated on the final sale to the U.S. buyer instead of an earlier one in the chain (whitehouse.senate.gov, govtrack.us). The bill is short. Its effect would not be. It would strip out one of the few legal ways importers still have to shrink the customs value of goods after a year in which tariffs became a structural cost rather than a temporary threat (gtlaw.com). That broader shift is the real story. On April 2, 2025, President Trump ordered a 10 percent baseline tariff on imports from all countries, with higher reciprocal tariffs for countries with large U.S. trade surpluses, using emergency powers under IEEPA (whitehouse.gov, federalregister.gov). Since then, import planning has become less about waiting out a policy cycle and more about building around a permanent surcharge. First sale matters in that world because every dollar shaved off declared value now ripples through a much larger duty bill. Customs compliance has already tightened before any law changes. CBP now requires importers using first sale to affirm that choice at entry, and the agency rolled out a specific declaration requirement and implementation guidance in late 2024 and early 2026 (cbp.gov, govinfo.gov). So even without Congress killing the method, companies are dealing with more paperwork, more audit exposure, and less room for casual use. The method is still legal. It is just no longer quiet. That pressure lands on logistics networks, not just customs teams. When tariffs jumped in 2025, importers rushed cargo forward to beat deadlines, and Southern California’s ports absorbed the surge. The Port of Los Angeles handled 1,019,837 TEUs in July 2025, the busiest month in its 117-year history, and the port said retailers and manufacturers accelerated shipments because they feared higher tariffs later in the year (portoflosangeles.org). The Port of Long Beach then finished 2025 with a record 9.9 million TEUs, its busiest year ever (supplychainbrain.com, polb.com). Those records looked like proof of Southern California’s staying power. They were also a sign of how much traffic was being pulled forward by tariff timing. Now the timing tricks are getting weaker. De minimis treatment has already been narrowed, first sale is under political attack, and 3PL surveys show shippers reworking sourcing, production, and distribution around tariff volatility rather than treating it as a passing disruption (trucknews.com, cpapracticeadvisor.com). That pushes companies toward duller, costlier habits: more buffer inventory, more alternate suppliers, more ports in the mix, and more skepticism about routing everything through the same gateway just because it was optimal in the last trade regime. Southern California still has the scale, rail links, labor pool, and warehouse base that made it the default U.S. import gateway in the first place. But the value of being fast to the biggest port is lower when tariffs are persistent and valuation methods are under attack. A network built to exploit narrow customs advantages starts to look fragile. A network built to survive customs surprises looks different. It carries more inventory. It uses more than one door. It does not assume the $10 shirt will still be dutiable at $10.
