New Tiered Steel & Aluminum Tariffs Roll Out on Liberation Day Anniversary

One year after President Trump's "Liberation Day" speech reshaped U.S. trade policy, the administration has moved to overhaul how steel and aluminum tariffs work. A presidential proclamation signed April 2, 2026 establishes a new tiered tariff framework under Section 232, effective April 6. The changes restructure duties on steel, aluminum, and — for the first time — copper imports into five rate tiers, while shifting the tariff calculation to the full customs value of each imported product. For contractors, fabricators, and distributors across the mechanical, electrical, and piping trades, this means the cost pressures that defined 2025 are about to intensify.

The revised Section 232 framework replaces the blanket 50% duty on raw metals with a graduated five-tier system that extends duties deeper into the supply chain:

Tier 1 — 50%: Articles made entirely or almost entirely of steel, aluminum, or copper. This covers primary metals and most products classified under HTS Chapters 72 (iron and steel), 73 (steel articles), 74 (copper — newly added), and 76 (aluminum articles). Raw steel coil, structural beams, copper rod, aluminum sheet — all stay at the full 50% rate.

Tier 2 — 25%: Derivative articles "substantially made" of covered metals. Think finished pipe fittings, prefabricated ductwork, certain valves, and assembled steel components where the metal content is dominant but the product includes other materials or significant fabrication.

Tier 3 — 15% (transitional through 2027): Certain metal-intensive industrial equipment and electrical-grid equipment. This carve-out is directly relevant to electrical contractors and utilities-scale work — transformers, switchgear, and grid infrastructure components get a temporary reduced rate, acknowledging the national push to modernize aging grid infrastructure.

Tier 4 — 10%: Derivative products manufactured abroad using American-origin steel, aluminum, or copper. This is designed to incentivize the use of domestically produced metals even when final fabrication happens overseas.

Tier 5 — 0% (exempt): Products where covered metals account for less than 15% of the article's weight are no longer subject to Section 232 metals tariffs.

Perhaps the most consequential change isn't the rate tiers — it's how the tariff is calculated. Under previous rules, importers could in some cases argue that duties should apply only to the metal content portion of a product's value. The new proclamation eliminates that. Section 232 duties now apply to the full customs value of the imported product, regardless of how much of that value comes from metal versus fabrication, finishing, or assembly.

In practical terms: a $500 imported stainless steel valve that's 60% metal by value used to see duties calculated on $300. Now the 25% derivative tariff applies to the full $500 — a $125 duty instead of $75. That's a 67% increase in the actual tariff paid, with no change in the posted rate.

The administration also shifted the reference point to the U.S. spot price of covered metals rather than importer-declared values, explicitly aiming to prevent artificial underpricing at the border.

The cumulative impact of a year under escalating trade policy is now showing clearly in the data.

Material costs are climbing again. Prices for goods used in new residential construction were up 3.4% year-over-year as of late 2025 — the largest annual increase since early 2023. But the averages mask sharper spikes in metal-heavy categories. Producer price indexes for aluminum mill shapes surged 33.0% and steel mill products rose 20.7% from January 2025 to January 2026, according to AGC — the steepest year-over-year jumps since early 2022. Copper is up roughly 36% year-over-year, hammering electrical and mechanical contractors.

Housing is taking a hit. Single-family housing starts fell 6.9% in 2025, totaling 943,000 units — down from over 1 million the prior year. Single-family construction spending dropped to roughly $419.6 billion, a 3.1% decline from 2024. NAHB estimates that tariffs have added approximately $10,900 per home in material costs, based on its April 2025 builder survey, with more than 60% of builders reporting direct cost increases.

Manufacturing construction is falling off a cliff. Total construction spending on manufacturing facilities declined from roughly $220 billion in early 2025 to $196.2 billion by January 2026, according to U.S. Census Bureau data. The decline began in late 2024 after a peak of $240.1 billion in August of that year.

Construction input prices are outrunning bids. The AGC reported that construction costs rose at their fastest rate since January 2023 through late 2025 — and crucially, those cost increases are outpacing what contractors can recover in their bid prices. Margins are getting compressed from both sides.

The tariff expansion isn't an abstract policy story — it's hitting every corner of the trades.

HVAC and mechanical contractors are among the hardest hit. The administration added 407 new product categories to the 50% Section 232 tariff over the past year. Coil-based steel products surged as much as 50% in the first half of 2025, while Midwest aluminum premiums spiked 54% after tariff announcements. Fabricators across the country have signaled 10–12% price increases, with additional hikes expected as the April 2026 changes ripple through.

Electrical contractors face a double squeeze. Copper wire, conduit, bus bar, and panel components are all subject to the new tariff tiers — and the addition of Chapter 74 (copper) to the Section 232 regime means these duties aren't going away. The 15% transitional rate on electrical-grid equipment offers some temporary relief for utilities-scale work, but that expires after 2027.

Structural steel and ironworkers remain at the top of the exposure chain, with raw structural steel firmly in the 50% tier. ENR data shows the 20-city average yearly price for structural steel rose 11.9% by the end of 2025.

The cost increases aren't just shrinking margins — they're killing projects. Many contractors report commercial and industrial jobs that have been cancelled, rebid, or significantly scaled back after updated steel, aluminum, or switchgear quotes exceeded original budgets by 10–15%. When metals and controls can represent 20–30% of a project's hard costs, a 10–15% swing in those categories can add 3–5% to total project costs — often more than the contractor's entire profit margin.

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