This paper examines the effects of fiscal devaluations in a model of a monetary union characterized by national fiscal policies and supranational monetary policy. We show that a revenue-neutral permanent tax shift in one country, which raises its consumption tax to finance a cut to labor taxes, increases welfare of the monetary union in the long run. The distribution of gains among countries depends on their degree of financial integration. We also document that price rigidities result in short-run welfare costs.