President Donald J. Trump has moved again to recalibrate U.S. tariffs on foreign steel, aluminum, and copper, signing a new proclamation that trims duties on certain metal‑intensive machinery while preserving, and in some cases reinforcing, the aggressive 50 percent levy he imposed on core strategic metals last year. The White House says the latest changes are designed to “more effectively address national security threats” while easing cost pressure on U.S. farmers, homebuilders and manufacturers that rely on imported equipment, underscoring how tariffs have become a central tool of both industrial and economic policy under Trump’s second term.
What the new proclamation does
According to a June 1 White House fact sheet, Trump’s latest proclamation “adjusts certain metals tariffs to more effectively address national security threats, spur investment in American agriculture, housing, and manufacturing, and facilitate U.S. production of related products.”
The key changes include:
- Lower tariffs on some equipment: Duties on a range of agricultural machinery, such as combines and harvesters, and “certain other equipment” are cut from 25 percent to 15 percent, a shift the White House says will “support U.S. farmers and the construction sector while keeping pressure on foreign metals.”
- Expanded 15 percent category: An existing category of industrial equipment subject to a 15 percent tariff is widened to cover mobile industrial equipment including bulldozers and forklifts, when imported from “trade deal countries” that qualify for that preferential rate.
- Incentives for using U.S. metals: Products made abroad that incorporate at least 85 percent U.S. steel or aluminum by weight — “melted and poured” or “smelted and cast” in the United States — can qualify for a 10 percent duty rate, rather than the standard 50 or 25 percent tariffs.
- Temporary window: These reduced rates are explicitly temporary, lasting until December 31, 2027, to encourage near‑term investment decisions that “rebuild the Nation’s industrial base.”
The proclamation does not unwind Trump’s broader metals‑tariff regime. Articles made “entirely or almost entirely” of steel, aluminum or copper remain subject to a 50 percent tariff, and derivative products still face a 25 percent duty unless they fall into the newly defined 15 percent or 10 percent categories.
How we got here: Tariffs ratcheted up, then refined
The June 1 adjustment builds on a series of moves Trump has made since returning to office to tighten and broaden Section 232 metals tariffs, which are justified under U.S. trade law on national‑security grounds.
A April 2026 proclamation fundamentally changed how those tariffs are calculated:
- Instead of applying only to the value attributed to the steel, aluminum or copper content of derivative products, the tariffs now apply to the full customs value of imported goods, including non‑metal components.
- The move was accompanied by a detailed re‑mapping of tariff lines, shifting hundreds of products between categories, and removing tariffs from items with metal content of 15 percent or less by value.
Trade‑law firm White & Case notes that as of April 6, 2026, the U.S. applies:
- A 50 percent tariff on “articles made entirely or almost entirely” of steel, aluminum, or copper, mostly in Harmonized Tariff Schedule chapters 72, 73, 74 and 76.
- A 25 percent tariff on derivative articles “substantially made” of those metals.
Those higher rates were layered on top of a June 2025 decision to double the base Section 232 steel and aluminum tariff from 25 percent to 50 percent, and a July 2025 proclamation that added copper to the Section 232 regime at the same 50 percent rate.
In February 2025, Trump had already scrapped “hundreds of thousands of product‑specific exceptions and country‑specific exemptions” that he said had accumulated during the Biden administration, arguing that carve‑outs had hollowed out the original national‑security purpose.
The latest adjustment is therefore best seen as a fine‑tuning of an already high‑tariff environment, not a reversal.
The stated rationale: National security and industrial policy
Both the April and June fact sheets stress that Trump views steel, aluminum, and copper as “strategic metals” whose domestic production is essential to national security. The White House says his tariffs are meant to:
- Shield U.S. mills and smelters from “low‑priced foreign imports” that threaten to undermine their financial viability and capacity.
- Support sectors deemed critical for national resilience, including defense manufacturing, the electric grid, housing construction, agriculture, and transportation.
- Encourage foreign manufacturers who want access to the U.S. market to source more inputs from American steel and aluminum producers, by offering lower duties on products built with U.S. metal.
A Commerce Department “What They Are Saying” roundup published April 12 features praise from industry groups and some labor leaders, who argue that stronger metals tariffs are already prompting new investment in U.S. mills and helping restore capacity idled during decades of import competition.
Relief for farms and factories, but with strings attached
The new 15 percent tariff tier for agricultural and industrial equipment reflects mounting concern in farm states and manufacturing hubs about the cost of imported machinery under the higher tariff regime.
International trade lawyer Mark Warner told Canadian television that the changes “appear to be a bit of a pivot,” lowering penalties on some derivative products such as agricultural machines and mobile industrial equipment from 25 percent to 15 percent, even as new items, including steel racks and aluminum lithographic plates, are added at a 25 percent rate.
The White House insists that the relief is narrow and conditional:
- Only certain tariff lines listed in an annex, including combines, harvesters, bulldozers, and forklifts, qualify for the 15 percent rate.
- The reduced rate is generally limited to imports from “trade deal countries” entitled to such treatment under existing agreements.
- The 10 percent “reward” rate is reserved for products that can document 85 percent or more U.S. content in the relevant metals.
For U.S. farmers and builders, that may translate into somewhat lower prices on imported equipment over the next 18 months, but still far above pre‑Trump tariff levels, and subject to change again if the administration further revises the schedule.
Trade partners and legal complexity
Abroad, the updated tariffs are likely to intensify long‑running trade frictions. Canada, the European Union and other allies have repeatedly objected to using Section 232 national‑security powers against their metals exports, and some responded to earlier Trump tariffs with retaliatory duties on U.S. goods.
The move to apply tariffs to the full customs value of derivative products, regardless of non‑metal content, adds new complexity for importers and foreign producers. White & Case warns that companies will need to “very carefully review” the updated annexes to determine which tariff level applies, especially for products that contain multiple metals or fall under overlapping tariff actions; the proclamation specifies that such items should pay only one of the three Section 232 tariffs, but not all at once.
There are also timing issues. The April proclamation took effect at 12:01 a.m. EDT on April 6, 2026 with no exception for goods already in transit, meaning shipments en route to U.S. ports suddenly became more expensive upon arrival. That pattern continued with the June adjustments, which lawyers say underscores the risk of regulatory whiplash for global supply chains.
Domestic debate: Protection vs. price pain
At home, Trump’s metals strategy has drawn strong support from many steel, aluminum, and copper producers, but concern from industries that rely on those metals as inputs.
Manufacturers of autos, appliances, construction materials and machinery warn that higher tariffs raise their costs and can erode their competitiveness against foreign firms that pay world market prices for steel and aluminum. Economists skeptical of broad tariffs argue that any jobs preserved in steel mills may be offset by job losses in downstream sectors and that higher input prices can feed into consumer inflation.
The administration counters that a strong domestic metals industry is a cornerstone of economic security, and that targeted relief, like the new 15 percent tier for equipment and the 10 percent rate for gear made with U.S. metals, shows it is calibrating tariffs to avoid unnecessary damage.
With the latest proclamation, Trump is signaling that his metals policy is entering a new phase: less about ratcheting up headline rates, more about fine‑tuning incentives and exceptions to direct capital exactly where his team wants it, in domestic mills, U.S.‑content supply chains, and politically important sectors like agriculture and construction.
For businesses that buy or sell steel, aluminum and copper, the message is equally clear: tariffs will remain a central feature of U.S. trade policy for the rest of this term and keeping up with the footnotes may matter as much as the headline 50 percent.