🇺🇸U.S. Section 338 tariffs of 5% took effect on selected Canadian imports at 12:01 a.m. EDT Saturday.

A senior Trump administration official said additional U.S. tariffs under Section 338 would apply at a rate of 5% to selected Canadian imports. The stated effective time was 12:01 a.m. Eastern Daylight Time on Saturday, August 22.

U.S. Customs and Border Protection issued guidance covering the Section 338 additional tariffs on specified Canadian goods. The supplied messages did not identify the individual products, tariff lines, exemptions, or customs-entry conditions covered by that guidance.

The 5% Section 338 measure was reported separately from messages discussing 50% U.S. tariffs and Canada’s planned dollar-for-dollar response. The source material does not explain the legal or product-level relationship between those two figures, so they cannot be treated as applying to the same set of imports.