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Why Wynne Should Win, Dan T. Coenen

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In Maryland State Comptroller of the Treasury v. Wynne, the Court could reshape core features of dormant Commerce Clause law. Maryland’s theory in the case is that it can lay an income tax on every penny of an individual resident’s income even if some of that income is earned entirely outside the state and therefore, in keeping with standard state practice, already taxed elsewhere. On its face, this approach exposes interstate income earners to overlapping income taxation. Maryland’s scheme thus violates a cardinal principle of dormant Commerce Clause law, “forbidding” state laws that expose interstate commerce “to the risk …