In Comptroller of the Treasury of Maryland v. Wynne, 135 S.Ct. 1787 (May 18, 2015) (5-4), the Court ruled, in an opinion by Justice Alito, that Maryland’s failure to credit the out-of- state taxes paid by Maryland residents when calculating their in-state tax liability violates the dormant Commerce Clause. In an unusual lineup, the four dissenters were Justices Scalia, Thomas, Ginsburg and Kagan.

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