Agricultural equipment and residential HVAC systems now qualify for a temporarily-reduced 15% ad valorem duty rate instead of the standard 25% derivative product rate under an amendment to Proclamation 11021 of April 2, 2026. The modification expands the category of Section 232 derivative products eligible for reduced tariffs, joining fixed industrial machinery and power equipment already covered at the lower rate.
The proclamation maintains the existing three-tier tariff structure established under Section 232: a 50% ad valorem duty on products made of aluminum, steel, or copper; a 25% ad valorem duty on derivative products predominantly composed of these metals; and the 15% temporarily-reduced duty on qualifying equipment categories. This latest expansion specifically targets derivative articles that serve what the Commerce Secretary identified as "productive domestic economic activity."
Mobile industrial equipment and machinery will also receive temporary tariff modifications under the new proclamation. The Commerce Secretary's recommendation cited the need to support American businesses and factories dependent on construction equipment, material-handling equipment, and related industrial products. These categories are currently classified as aluminum or steel derivative articles due to their predominant metal composition.
Classification impact: Products in agricultural equipment, residential HVAC, and mobile industrial equipment categories must be evaluated for derivative article status under Proclamations 9704 (aluminum), 9705 (steel), and 10962 (copper). The "predominantly composed" threshold determines whether the 25% or 15% rate applies.
The amendment also expands product coverage to include aluminum lithographic plates and steel racks, which were not previously subject to Section 232 aluminum and steel tariffs. These additions ensure alignment with Proclamation 11021's derivative product regime. Additionally, the threshold for qualifying as "entirely" made from American aluminum, steel, or copper—an exemption pathway under Proclamation 11021—will be modified.
Rate table updates required: Systems pulling HTS data for agricultural equipment (Chapter 84 subheadings), HVAC components (Chapter 84 and 85), and mobile industrial machinery must account for the new 15% derivative rate. The proclamation does not enumerate specific HTS codes, meaning classification logic must evaluate metal composition against the "predominantly composed" standard and end-use criteria.
The regulatory chain traces back through Proclamation 11021 (April 2, 2026), Proclamation 10962 (July 30, 2025) for copper, and the original 2018 proclamations—9704 for aluminum and 9705 for steel. Compliance systems must reference this full lineage when computing applicable duties, as the base Section 232 rates layer on top of standard MFN duties for covered products.
For trade compliance engineering teams, the absence of explicit HTS enumeration in the proclamation text creates classification ambiguity. Determining whether a specific agricultural machine or HVAC unit qualifies for the 15% rate requires evaluating both metal composition percentage and intended use case—residential HVAC specifically, not commercial. Rate caching strategies should flag these categories for manual review until CBP issues implementation guidance.