Tariffs complicate procurement

A U.S. buyer can now import a steel bolt, an aluminum panel, or a copper-heavy component and face three different tariff questions before the shipment even reaches the dock. An April 2, 2026 presidential proclamation rewrote how Section 232 tariffs apply to many metal products and their “derivatives,” which are finished goods made from those metals. (whitehouse.gov) The biggest change is that many derivative products are no longer taxed only on their metal content. The new rule applies the Section 232 tariff to the full customs value of the imported product, which means the duty can hit the whole machine, fitting, or assembly instead of just the steel, aluminum, or copper inside it. (jdsupra.com) That sounds technical, but the math is simple. If an imported air-handling unit contains $8,000 of metal inside a $40,000 finished product, the tariff question used to center on the $8,000 metal share; now, for covered derivative goods, the tariff can attach to the entire $40,000 customs value. (jdsupra.com) The rates are already high before you get to that broader base. Legal summaries of the April changes say primary steel and aluminum articles generally remain subject to 50% Section 232 tariffs, while derivative-product treatment depends on the annexes and country-of-origin rules tied to the proclamation. (jdsupra.com) Copper is the newer piece of the puzzle. The White House says copper was added to the Section 232 program in July 2025 at the same 50% rate as steel and aluminum, so procurement teams that used to focus mostly on rebar, beams, and curtain wall now also have to watch wire, tubing, and copper-intensive assemblies. (whitehouse.gov) This is why companies are reopening bills of materials, which are the line-by-line ingredient lists for a product. If a rooftop unit, elevator package, or fabricated assembly crosses into a tariffed derivative category, the exact share of steel, aluminum, or copper and the exact tariff code assigned at customs can change the landed cost by thousands of dollars. (constructiondive.com) The tariff code matters because Section 232 is enforced through Harmonized Tariff Schedule classifications, which are the product categories customs uses like a giant warehouse map. United States Customs and Border Protection says steel derivative products entered under certain classifications can qualify for an exemption if they are made from steel exclusively melted and poured in the United States. (cbp.gov) That exemption language creates a second procurement problem: proof. A contractor or distributor now needs supplier certifications showing where steel was melted and poured or where aluminum was smelted and cast, because a missing document can turn a claimed exemption into a 50% duty bill. (jdsupra.com) Some importers had expected broad relief for machinery that only contains a modest amount of metal, but the April revisions were narrower than that. Trade lawyers say some products were removed from the tariff lists, several dozen new products were added, and many finished goods still got only partial relief rather than a clean carveout. (jdsupra.com) Construction firms are feeling this unevenly because a concrete subcontractor buying domestic cement may see little change while a mechanical contractor importing packaged equipment can get hit twice, once by the product’s classification and again by the full-value rule for derivatives. Construction Dive reports contractors expect project impacts to vary widely by material type and embedded metal content. (constructiondive.com) The practical response is moving upstream into contracts. Buyers are rewriting purchase orders to pin down tariff responsibility, require origin documentation, and set price-adjustment rules before fabrication starts, because the surprise is no longer just the cost of metal itself but whether customs decides the whole imported product belongs on a Section 232 list. (constructiondive.com)