Erik M. Jensen


In Polar Tankers, Inc. v. City of Valdez, the Supreme Court in 29 struck down a City of Valdez levy that was in form a personal-property tax, but that primarily reached oil tankers using Valdez’s ports, on the ground that the levy violated the Tonnage Clause of the Constitution (“No State, shall, without the consent of Congress, lay any Duty of Tonnage”). The Tonnage Clause, part of the constitutional structure intended to ensure federal primacy in regulating commerce, was once a staple of litigation, but Polar Tankers was the first Supreme Court case decided under the Clause since 1935. Polar Tankers provides the opportunity to revisit a clause that might now seem quirky, but that was unquestionably important in the first century of the Republic, that raises many intriguing interpretive issues, and that can still (as this case shows) have significant effect.


Polar Takers, Inc. v. City of Valdez, Tonnage Clause, Constitutional Law, Commerce, Import-Export Clause, Export Clause, Statutory Drafting

Publication Date


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Place of Original Publication

George Mason Law Review

Publication Information

18 George Mason Law Review 669 (2011)


COinS Erik M. Jensen Faculty Bio