Executive Order 14289 addresses what the administration characterizes as excessive cumulative effects created by overlapping tariff measures on imported goods. According to the order, while each tariff action serves "separate and distinct policy purposes," the President has determined that when multiple tariffs apply to the same article, the resulting "stacking" creates duty rates that "exceed what is necessary to achieve the intended policy goals." The order establishes a hierarchy among five specific tariff actions to prevent their cumulative application, while maintaining that each individual tariff measure remains independently valid and enforceable.
The order creates a clear precedence hierarchy among five specific tariff actions: tariffs on automobiles and automobile parts (Proclamation 10908) take highest priority, followed by tariffs addressing drug flows across northern and southern borders (Executive Orders 14193 and 14194 with their respective amendments), while aluminum and steel tariffs (Proclamations 9704 and 9705 with amendments) have lowest priority. Notably, steel and aluminum tariffs are the only measures allowed to be applied cumulatively with each other when the same article is subject to both. The order explicitly states that these five tariff actions may still stack with other duties not listed in the order, including standard HTSUS duties, section 301 duties, duties addressing synthetic opioids from China, and antidumping/countervailing duties.
Implementation responsibility falls primarily to the Secretary of Homeland Security, acting through U.S. Customs and Border Protection and in consultation with Treasury, who must update guidance, systems, and enforcement mechanisms by May 16, 2025. The Commerce Secretary, Homeland Security Secretary, Treasury Secretary, and U.S. Trade Representative are jointly tasked with providing additional guidance for consistent interpretation. Significantly, the order applies retroactively to all entries made on or after March 4, 2025, requiring refunds to be processed according to standard procedures. The administration frames this reorganization of tariff priorities as maintaining the substantive policy purposes of each measure while eliminating what it considers unnecessary excessive duty rates on affected imports.