According to proclamations released July 20, 2026, an additional 50% tariff under Section 338 of the Tariff Act of 1930 takes effect at 12:01 a.m. EST on August 19, 2026. Three things make this different from existing duties:

1. No USMCA escape. Even goods qualifying under the US-Mexico-Canada Agreement are not excluded. If you assumed free-trade agreement coverage protects you — it doesn’t here.

1. No stacking relief with Section 232. The 50% does not stack with existing steel/aluminum/copper tariffs (already 15%–50%). That means the higher Section 338 rate effectively replaces, not adds to, Section 232 for covered goods — but the net cost is still the highest applicable rate.

1. FTZ lock-in. Goods entering a Foreign Trade Zone must be admitted under “privileged foreign status,” meaning the tariff is locked at entry date — not the usually lower withdrawal-date rate.

Canada is not sitting still. It maintains a 25% counter-tariff on certain US steel, aluminum, and vehicles. The bilateral cost spiral is real.

For procurement teams: if your BOM includes Canadian-origin aluminum, copper, machinery components, or anything routed through a US FTZ — you have 12 days to reclassify, re-route, or re-negotiate. After August 19, the cost profile changes permanently.

Pre-classification and origin tracing isn’t just a China customs exercise. It’s a global one.

Comment ‘guide’ if you’re importing industrial materials into China and want a tariff impact check.

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