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Global Trends

Update on Tariff Stackability, Primarily Related to Imports from Canada and Mexico

May 6, 2025
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On April 29, the Trump Administration published an Executive Order (EO) clarifying which tariffs are subject to a cumulative effect (i.e., which tariffs “stack” on top of one another) for steel and aluminum products from Canada or Mexico.

The exemption for Section 232 tariffs on non-USMCA compliant steel and aluminum imports is retroactive to March 4 and importers will be able to receive a refund “processed pursuant to applicable laws and U.S. Customs and Border Protection’s standard procedures for such refunds”.

Further, the tariffs listed above are still subject to stacking of other tariffs, including (as applicable):

Please see the table below for examples of PMMI inputs and finished goods that are subject to additional tariffs.

Please see below a table of the tariff actions for reference.

Trade Action Executive Order FR Notice
Non-USMCA compliant from Canada/IEEPA Imposing Duties to Address the Flow of Illicit Drugs Across Our Northern Border and any amendments made to the Executive Order 90 FR 11369 – latest amendment
Non-USMCA compliant from Mexico/IEEPA Imposing Duties to Address the Situation at Our Southern Border and any amendments made to the Executive Order 90 FR 11746 – latest amendment
Reciprocal Tariffs Regulating Imports with a Reciprocal Tariff to Rectify Trade Practices that Contribute to Large and Persistent Annual United States Goods Trade Deficits
Aluminum tariffs Adjusting Imports of Aluminum into the United States and any amendments made to the Executive Order 90 FR 11251 – latest amendment
Steel tariffs Adjusting Imports of Steel into the United States and any amendments made to the Executive Order 90 FR 11249 – latest amendment
Tariff on automobiles Adjusting imports of automobiles and automobile parts into the United States 90 FR 14705