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Worked example
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Since April 6, 2026, the Section 232 duty on steel, aluminum and copper goods is charged on the full customs value of the product, not on its metal content. That one sentence from Proclamation 11021 changes the landed cost of many US entries, and many costing sheets have not caught up.
Here is what changed. From June 4, 2025, Proclamation 10947 set the steel and aluminum duty at 50%. For articles in Chapter 73 it applied only to the steel content, and for Chapter 76 only to the aluminum content. Importers declared the metal content value and paid 50% of that. A $40,000 entry with $12,000 of steel paid $6,000.00 in Section 232 duty.
The April 2, 2026 proclamation replaced that basis. For goods entered on or after April 6, 2026, the duty applies to the full customs value, regardless of metal content. The rates were split into tiers. Annex I-A goods (aluminum and steel articles, most copper articles, certain derivatives) pay 50%. Annex I-B goods (certain copper articles and derivatives) pay 25%. UK products with UK-melted steel or UK-smelted aluminum pay 25% or 15%. Derivatives made from metal melted or smelted in the US pay 10%. Annex III goods pay whatever brings the Column 1 rate plus the 232 duty to 15% in total, until December 31, 2027.
A second proclamation on June 1, 2026 added Annex I-C from June 8, 2026: 25%, or the 15% total rule for products of the EU, Japan, Korea, the UK, Switzerland, Taiwan and five other partners. It also lowered the bar for "US metal" to 85% of the metal by weight.
Take the sample entry again: customs value $40,000, $12,000 of steel, Annex I-B 25% tier, MFN 3.4%, freight $2,800, 800 units. On full value the Section 232 duty is $10,000.00. The old content basis gave $6,000.00. The sample pays $4,000.00 more per entry, or $5.00 more per unit. Add the $1,360.00 MFN duty and the freight and the landed cost is $67.70 per unit. Duty is 20.97% of landed cost.
Put the same entry in the 50% tier and the 232 duty is $20,000.00, landed cost $80.20 per unit. Switch on the 15% total rule instead and the 232 rate drops to 11.60%: $4,640.00 of 232 duty, $6,000.00 of total duty and $61.00 per unit.
What a costing error costs: if an entry is filed on the old content basis, the duty CBP should have collected is the gap. Under 19 U.S.C. 1592(c)(3) a negligent violation can cost up to the lesser of the domestic value or 2x the lost duties. In the sample that ceiling is $8,000.00 on one entry line. Even if your broker files correctly, a price list built on the content basis is $5.00 per unit too low on every unit you sell.
The free calculator on our page takes 8 entries: customs value, metal content value, Column 1 rate, 232 tier, the 15% total rule, any other Chapter 99 duty such as Section 301, freight and insurance, and units. It returns 12 results, including the old content-basis duty next to the new one, so you can see the gap in dollars. It runs in your browser and nothing is uploaded.
What it does not do: it does not tell you which Annex your HTS code is in. Look that up in the current HTSUS chapter 99, then pick the tier. It does not split USMCA non-US content either; that rule is listed in the workbook's tier sheet.
The workbook is for keeping records: the same 12 live formulas, plus a sheet with the 9 Section 232 rate tiers in force, each tied to its proclamation clause. Copy the tab once per entry line and hand the file to your broker or accountant.
Check your own entry before you set next month's prices.
15 seconds — what it actually does
Questions people ask
What does this Section 232 tariff calculator work out?
It takes one entry line and applies the Section 232 steel, aluminum and copper duty to the full customs value, as required for goods entered on or after April 6, 2026 under Proclamation 11021. It adds the Column 1 duty and any other Chapter 99 duty, compares the result with the old metal-content basis, and gives landed cost per unit.
Who is it for?
US importers of record, Amazon and Shopify sellers and small manufacturers who bring in steel, aluminum or copper goods and must set prices and check their broker's entry. If your product is in Annex I-A, I-B, I-C or III of the 2026 proclamations, the 232 duty now runs on the whole value.
Why not use a free duty calculator or a chatbot?
Most free tools and chatbots still apply the 2025 rule: 50% on the steel or aluminum content only. Since April 6, 2026 the duty is on the full customs value, with 25%, 15% and 10% tiers and a 15% total rule for Annex III goods, so the old method under-states the duty.
What is free?
The whole check for one entry line runs free in the browser: you type 8 entries and see all 12 results, including the 232 duty, the shortfall against the content basis, the 2x penalty ceiling and landed cost per unit. Nothing is hidden or locked, and you see your own answer before you pay anything.
What does a mistake cost compared with the $21 workbook?
Under 19 U.S.C. 1592(c)(3) a negligent under-declaration can cost up to 2x the lost duty. In the sample entry the content basis under-pays $4,000.00, so the ceiling is $8,000.00. The $21 workbook is a one-time payment, not a subscription, and keeps a dated copy for every entry line.
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