The tariffs are effective with respect to goods entered, or withdrawn from warehouse for consumption, on or after March 23, 2018. Countries with temporary exclusions to the tariffs include Canada, Mexico, Australia, Argentina, South Korea, Brazil and  member countries of the European Union (Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the United Kingdom).

Customs and Border Protection noted that exclusions are based on the country of origin, not the country of export. The merchandise covered by the additional duties may also be subject to pre-existing antidumping and countervailing duties.