The Full-Value Trap: How New Section 232 Rules Double Your Duty Bill

On April 6, a presidential proclamation rewired how Section 232 tariffs are calculated on steel, aluminum, and copper products. If you import anything with metal components — from industrial machinery to kitchen sinks — your duty exposure may have doubled overnight. Here's exactly what changed, which tier your products fall into, and what you need to do this week.

Picture this: you import a $100 industrial valve. It contains $18 worth of steel. Under the old rules, your Section 232 duty was calculated on that $18 of steel content — $9 at the 50% rate. Not great, but manageable.

Under the rules that took effect April 6, 2026, your Section 232 duty is calculated on the full $100 customs value of the valve. At the 25% rate for derivative products, that's $25 in Section 232 duties alone — nearly triple what you paid ten days ago, on the exact same product, from the exact same supplier.

That's the "full-value" shift. And it's hitting importers of finished goods, mixed-material products, and industrial components far harder than anyone importing raw steel or aluminum billets. For those primary metal importers, the rate went up but the calculation method didn't change much. For everyone downstream — manufacturers, distributors, retailers importing products that happen to contain metal — the ground just moved under their feet.

What Actually Changed on April 6

On April 2, 2026, President Trump issued a proclamation restructuring the Section 232 tariff regimes for steel, aluminum, and copper under the Trade Expansion Act of 1962. The changes took effect four days later, at 12:01 a.m. Eastern on April 6.

The proclamation made three fundamental changes:

1. Section 232 duties now apply to the full customs value of covered products — not just the value of the metal content. This is the big one. Since June 2025, importers of derivative products (finished goods containing steel, aluminum, or copper) had been calculating their Section 232 liability based only on the metal portion of the product's value, as reflected on the commercial invoice. That approach is gone. The tariff now hits the entire declared import value.

2. A new tiered rate structure replaces what was effectively a single 50% rate for most covered products. The tiers range from 0% to 50%, depending on metal content and origin.

3. The scope of covered derivative articles has been revised — some products were added, some were removed, and all of them were reorganized into new annexes that determine which rate applies.

The administration described the changes as simplifying tariff administration and closing circumvention loopholes. For importers, it means reclassifying every covered product against the new annexes and recalculating duty exposure from scratch.

The New Tiered Framework: Four Rates, Four Annexes

The proclamation establishes four tiers, each tied to a specific annex of the Harmonized Tariff Schedule:

The 50% tier under Annex I-A is the core list. It covers most HTSUS subheadings in Chapters 72, 73, 74, and 76 — the traditional steel, iron, aluminum, and copper product chapters. If you're importing raw or semi-finished metal, you're here.

The 25% tier under Annex I-B is where the action is for downstream importers. This covers a much broader range of finished products that incorporate metal — everything from automotive parts to household goods to industrial machinery. These are the products that previously had their Section 232 liability calculated on metal content only. Now they pay 25% on the full customs value.

The 15% Threshold: A New Classification Boundary

One of the most consequential provisions in the proclamation is the 15% de minimis threshold by weight. If your product contains less than 15% steel, aluminum, or copper by weight, it qualifies for 0% Section 232 duty under HTS provision 9903.82.03.

This creates a new classification boundary that didn't exist before. Whether your product weighs in at 14.9% or 15.1% metal content is now a question worth tens of thousands of dollars on a large shipment. Importers need to know — precisely — the metal content by weight of every product they bring in that falls anywhere near this threshold.

For products above 15% metal content that appear on Annex I-B, the full 25% rate applies. There's no sliding scale between 0% and 25%. It's a cliff.

Here's what that means in practice: An importer bringing in an industrial pump assembly valued at $5,000 with 20% steel content by weight now owes $1,250 in Section 232 duties (25% of the full $5,000 value). Under the old metal-content-only approach, the same importer would have calculated 232 liability on roughly $1,000 of steel content at 50% — yielding $500. The new framework more than doubles the duty on the same product.

Who Gets Hit — and Who Gets Relief

Biggest losers: importers of high-value finished goods with moderate metal content. If you import products where the metal is a small-to-moderate fraction of total value — think electronics enclosures, appliances, automotive components, industrial equipment — the shift from metal-content-only to full-value calculation amplifies your duty exposure dramatically. The higher the ratio of total product value to metal value, the bigger the hit.

Mixed news: primary metal importers. If you're importing steel coil, aluminum plate, or copper cathode, your product is essentially 100% metal. The shift to "full value" doesn't change your calculation much — your metal content value already was your full customs value. But the base rate for Annex I-A products is now locked at 50%, and the tiered structure means there's no longer a single-rate framework to navigate.

Winners: importers of products with less than 15% metal content. If your products contain small amounts of steel or aluminum — fasteners in a plastic assembly, a thin metal housing on a largely non-metal product — the new 0% threshold is a gift. Under the old rules, even trace metal content in a covered derivative product triggered Section 232 liability on the metal portion. Now, if you're under 15% by weight, you're exempt entirely.

Special case: products made with U.S.-origin metal. The 10% rate under Annex III applies to products manufactured overseas but using at least 95% U.S.-melted, smelted, and poured/cast metal. This incentivizes reshoring the metal supply chain even when final manufacturing stays overseas. It's a narrow category, but for some supply chains — particularly in automotive and aerospace — it could be worth restructuring.

FTZ and Drawback: The Rules Changed Too

The proclamation didn't just change rates. It rewrote the implementation rules for Foreign-Trade Zones (FTZs) and duty drawback.

FTZ entries: Articles entered into a U.S. foreign-trade zone on or after April 6, 2026, may only be admitted under "privileged foreign status" — meaning the duty rate is locked at the time of admission. Products admitted under privileged foreign status before April 6 are subject to the applicable rates under their original HTSUS subheading upon entry for consumption. This eliminates the ability to use FTZ timing strategies to avoid the new rates on goods admitted after the effective date.

Drawback limitations: Manufacturing drawback under 19 U.S.C. § 1313(a)–(b) is available for Annex I-B and Annex III articles — but only if the products originate from a Trade Agreement Partner (currently the UK, EU, Japan, South Korea, Mexico, Canada, and future reciprocal partners), where the metal content was smelted or cast in a Trade Agreement Partner country, and the article is not subject to antidumping or countervailing duty orders. That's a narrow window that excludes most Chinese-origin metal products from drawback eligibility.

Products Removed from Scope

Not everything in the proclamation is bad news. Annex II lists derivative products that are completely removed from Section 232 coverage as of April 6. These products are no longer subject to any Section 232 duties on steel or aluminum.

The catch: unless otherwise excepted, products removed from Section 232 scope become subject to the 10% global tariff under Section 122 of the Trade Act of 1974, which is currently in effect until July 24, 2026. So "removed from scope" doesn't mean duty-free — it means a potential rate reduction from 25–50% down to 10%, at least for the next few months.

Importers should cross-reference their HTS codes against Annex II immediately. If any of your products moved off the 232 list, the duty savings are significant and retroactive to April 6.

What to Do This Week

The new rules are already in effect. Here's your priority list:

1. Map every import line against the four annexes — Pull your HTS codes for any product containing steel, aluminum, or copper. Determine which annex each falls under: Annex I-A (50%), Annex I-B (25%), Annex II (removed), Annex III (10% U.S.-origin metal), or the de minimis 0% tier. Your broker should already be doing this — if they haven't reached out, call them.

2. Weigh your products — Literally. The 15% threshold is by weight, and it's a cliff. If you're importing finished goods near that threshold, get precise weight breakdowns from your suppliers. A product at 14% metal content by weight pays 0% Section 232. At 16%, it pays 25% on the full customs value. Document the metal content in your import records — CBP will ask.

3. Recalculate your landed cost models — Every financial projection, pricing model, and margin analysis that assumed metal-content-only calculation is now wrong. Update them with full-value calculations at the applicable tier rate. For derivative products that moved from metal-content-at-50% to full-value-at-25%, run both scenarios — depending on the metal-to-total-value ratio, you may be paying more or less than before.

4. Review your FTZ strategy — If you're using foreign-trade zones, understand that the privileged-foreign-status requirement limits your ability to defer or reduce duties under the new framework. Consult with your FTZ operator about the implications for inventory currently in the zone.

5. Check Annex II for savings — Cross-reference your products against the list of items removed from Section 232 scope. If any of your imports moved to Annex II, file for the lower Section 122 rate on entries since April 6. This is money on the table.

6. Audit your supplier documentation — The 95% U.S.-origin metal threshold for the 10% rate requires proof of where the metal was melted, smelted, and poured. If any of your supply chains could qualify, start collecting the documentation now. The savings — 10% versus 25% or 50% — justify the paperwork.

What's Coming Next

July 24, 2026: The Section 122 tariff (the 10% global tariff imposed after IEEPA tariffs were struck down) is set to expire. Products removed from Section 232 scope via Annex II will need a new rate determination at that point — watch for an extension or replacement.

New Section 301 investigations: USTR launched two massive Section 301 investigations in March targeting 60 countries on forced labor and excess manufacturing capacity. Public hearings begin April 28. These investigations are widely understood as the mechanism to reconstruct the IEEPA tariff regime under different legal authority. Any resulting Section 301 tariffs would stack on top of the new Section 232 rates.

Derivative product expansions: The proclamation preserves the administration's authority to expand coverage on a rolling basis. Products not currently on Annex I-A or I-B could be added at any time through subsequent proclamations. Monitor the Federal Register.

Classification Just Became a Profit Center

For years, Section 232 was a steel-and-aluminum problem. Raw metal importers paid the tariff, everyone else moved on. The April 6 proclamation changed that. By shifting to full-value calculation and a tiered framework that pulls in derivative products across dozens of HTS chapters, Section 232 is now a concern for anyone importing anything with meaningful metal content.

The 15% weight threshold alone creates a new classification question on thousands of products. Getting it right is the difference between 0% and 25% on the full value of your imports. That's not a compliance exercise — it's a profit-and-loss decision.

TariffLens can map your product catalog against the new Section 232 annexes and flag products near the 15% de minimis threshold, helping you identify which tier applies and where reclassification could reduce your duty exposure.

This article is for informational purposes only and does not constitute legal, tax, or customs advice. Consult a licensed customs broker or trade attorney for guidance specific to your situation.