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U.S. Tariff Stacking Changes Explained

New US EO reshapes tariff stacking for steel, aluminum & IEEPA “Fentanyl” tariffs. Updated FAQ flowchart shows what you must pay.


The recent Executive Order (EO) revising the tariff stacking hierarchy directly impacts customs, compliance, and trade professionals dealing with U.S. imports of steel, aluminum, and products subject to IEEPA “Fentanyl” tariffs. These changes refine how tariffs apply to avoid double taxation on the same goods under overlapping tariff regimes.


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Key Questions Covered in This Blog

  • What is the tariff stacking hierarchy, and why was it revised?

  • How does the new EO change the treatment of IEEPA “Fentanyl” tariffs and Section 232 steel/aluminum tariffs?

  • How are derivative steel and aluminum articles assessed under the new rules?

  • What are the compliance implications for customs professionals and importers?


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