As of 12:01 a.m. Eastern on June 8, 2026, the rules for Section 232 tariffs on steel, aluminum, and copper changed again. The latest White House proclamation, signed June 1 and in force through December 31, 2027, reshapes how duties apply to metals and the long list of "derivative" products that contain them.
By one estimate, the changes touch roughly $58 billion in imports.
Here is the part that matters for anyone bringing goods into the United States: this round does not move in a single direction. Some products just got cheaper to import. Others just got more expensive. A handful came off the Section 232 list entirely. The only way to know which side of the line your product falls on is to check your specific HTS classification, because that classification now drives almost everything.
What actually changed
There are several moving parts, but these are the ones that affect the most importers.
The reduced 10% rate is easier to reach. A product now qualifies for the 10% rate if at least 85% by weight of its steel, aluminum, or copper content was smelted and cast, or melted and poured, in the United States. That threshold dropped from 95%, which means more manufacturers using mostly American metal can claim the lower rate without changing anything about their supply chain.
The 15% category expanded. Agricultural equipment, residential HVAC systems and components, and certain mobile industrial machinery were added to the temporary 15% bracket, down from the standard 25%. For importers of tractors, harvesters, forklifts, and HVAC units, that is a real reduction.
New products got pulled in at 25%. Aluminum lithographic plates (HTS 3701.30.00) and steel shelving, racks, and parts (heading 9403) are now treated as covered derivatives at the full 25% rate. If you import warehouse racking or printing plates, your duty picture changed overnight.
Very low metal content is now exempt. Products made of 15% or less steel, aluminum, or copper are no longer subject to Section 232 metals tariffs at all. For some finished goods that carried duty only because of a small metal component, that is a clean win.
Why it is trickier than it looks
Since the April 2026 overhaul, Section 232 duties apply to the full customs value of a covered product, not just the value of the metal inside it. A $20,000 machine that is partly steel is taxed on the whole $20,000, not on the steel alone. The June 8 changes keep that methodology, which is why classification matters so much now. Your HTS code, not a metal-content calculation, decides your rate.
Timing matters too. The new treatment applies to goods entered for consumption, or withdrawn from a warehouse for consumption, on or after 12:01 a.m. Eastern on June 8. For a shipment already on the water, the entry date can be the difference between the old rate and the new one. CBP issued filing instructions on June 5 (CSMS #68855869), so customs brokers should already be working from the updated guidance.
There are country-specific wrinkles as well. Goods from the United Kingdom, the European Union, Japan, and South Korea continue to receive reduced rates tied to their trade agreements. For qualifying USMCA goods from Canada and Mexico in the affected categories, the 25% rate applies only to the non-U.S.-content portion of the value. And aluminum tied to Russian primary metal still carries a 200% rate.
What importers should do now
Re-check your HTS classification against the new annexes. The rate follows the code, and a product that was borderline before may sit in a different bracket today.
Test your domestic-content position. If your metal is mostly U.S.-sourced, the lower 85% threshold may now put the 10% rate within reach.
Model your entry timing. For cargo near arrival, confirm whether entering before or after June 8 changes the duty.
Watch the USMCA content method. If you source from Canada or Mexico, the non-U.S.-content calculation can meaningfully lower the bill.
The bottom line
Section 232 has shifted three times in roughly two months, and the trend is toward rules that reward classification precision and domestic content while widening the net for certain derivatives. Eyeballing your exposure is no longer enough.
You can check your own product and origin in minutes with the tariff simulator at tariff.gatewaylines.com. It applies the current stacked rates to your HTS code and declared value, so you see the real number rather than last quarter's number. From there, Gateway Lines helps importers turn that duty figure into a complete landed cost, with freight, duties, and customs handled in one place, so you can plan around the rules as they stand today.
Sources: White House proclamation of June 1, 2026, "Further Adjusting the Tariff Regimes for Imports of Aluminum, Steel, and Copper into the United States"; U.S. Customs and Border Protection guidance, CSMS #68855869 (June 5, 2026); Congressional Research Service, "Section 232 Tariffs on Steel and Aluminum." Importers should verify current rates against the official White House and CBP postings before filing.