Tariff complexity rises

The Trump administration did not just raise metal tariffs last week. It rewired them. On April 2, President Trump signed a proclamation that changed how Section 232 tariffs apply to steel, aluminum, copper, and the huge universe of products made from them. The old system tried to tax only the metal content inside mixed products. The new system, effective April 6, taxes the full customs value of many covered goods instead. That sounds simpler. In practice, it creates a new map of winners, losers, and loopholes (whitehouse.gov, globaltradeandsanctionslaw.com). The reason this matters is that the old method had already become a compliance swamp. Since mid-2025, importers of mixed metal and non-metal products had to separate the value of the steel, aluminum, or copper from everything else in the item. Trade lawyers said that exercise produced “considerable confusion” because customs valuation law was never built for that kind of forensic slicing. The April 2 proclamation scrapped that approach and replaced it with tariff treatment based more heavily on tariff classification, metal intensity, and annex lists attached to the proclamation (globaltradeandsanctionslaw.com, whitehouse.gov). That new structure is blunt. Goods made entirely or almost entirely of steel, aluminum, or copper now face a 50 percent tariff on their full value. Many derivative products with substantial metal content face 25 percent. Some industrial and electrical-grid equipment gets a temporary 15 percent rate through the end of 2027. Products made abroad entirely from U.S.-origin metal can get a 10 percent rate. Products with 15 percent or less covered metal are out. Hundreds of low-metal derivatives were removed from coverage, while a smaller set of additional products was brought in or left exposed through the annexes (whitecase.com, ey.com, whitehouse.gov). A rule like that changes behavior fast, because it changes what counts. If a product falls just above or below a metal-content threshold, or lands in one tariff code instead of another, the duty bill can swing wildly. Customs guidance went out on April 3 through CBP’s Cargo Systems Messaging Service, telling importers how to start reporting under the new regime. Trade advisers immediately warned clients to review tariff classifications, origin records, smelt-and-cast documentation, foreign-trade-zone treatment, and drawback claims. When the government says a derivative product will be taxed according to annexes, thresholds, and origin conditions, companies start redesigning paperwork as much as supply chains (cbp.gov, chrobinson.com, thompsonhinesmartrade.com). That is the broader story. High tariffs do not only push factories to move. They also push invoices, routing, and product descriptions to move. The New York Times reported on April 7 that U.S. imports from China appear to have fallen sharply, but that “billions of dollars” of the change looks less like a clean supply-chain migration and more like accounting gimmicks and outright fraud, including misreported origin and other evasive tactics (nytimes.com). That finding fits the incentives. When tariffs hinge on where a product was melted, poured, smelted, classified, assembled, or merely relabeled, the border becomes a contest over documents. The government knows this. CBP said in August 2025 that from January 20 to August 8 of that year it had uncovered more than $400 million in unpaid duties through EAPA investigations and identified 89 cases with reasonable suspicion of evasion. In its biggest case, the agency said 23 U.S. importers and a network of Chinese shell companies routed goods through Indonesia, South Korea, and Vietnam, with more than $250 million in revenue identified for collection (cbp.gov). The metal-tariff rewrite lands on top of that enforcement landscape, not before it. It also lands after a year in which tariffs already reshaped trade data in ways that are easy to overread. New York Fed researchers found that China’s share of U.S. imports fell from nearly 25 percent in 2017 to around 15 percent by 2024, then dropped below 10 percent in the first eleven months of 2025, while Mexico and Vietnam gained share. They also found that nearly 90 percent of the economic burden of the 2025 tariffs fell on U.S. firms and consumers (newyorkfed.org). So when trade flows suddenly look cleaner on paper, there is a good reason to ask whether production moved, or whether the paperwork did. The new metal rules make that question harder, not easier. They remove one kind of valuation guesswork, then replace it with a denser system of annexes, thresholds, exceptions, origin tests, and product-by-product treatment. The White House presented that as clarity. In the real world, clarity that depends on dozens of classification lines and documentary conditions is a different kind of complexity. It begins at 12:01 a.m. on April 6, 2026, when goods already in transit lost the benefit of the old rules and the full-value tariff clock started running (whitecase.com, whitehouse.gov).