Abstract
We develop a theory of cross-border income shifting in response to subnational personal taxation in a federation and examine its implications for the excess burden of personal taxes. We show how a properly chosen federal tax rate can offset the fiscal externality between states and facilitate decentralization, even in a heterogeneous federation where unitary taxation is suboptimal. Optimal taxes depend on the elasticities of national tax avoidance and of cross-state tax base shifting. We estimate these elasticities around a tax decentralization reform in Canada, finding both to be empirically relevant. We discuss the implications for optimal federalism. (JEL D31, H21, H23, H24, H26, H71, H77)
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