For decades, the European legislators and the Court of Justice have extended the rights to free movement and cross-border welfare in the European Union (EU). Strong assumptions on the impact of these rules have been posed, by some held to lead to welfare migration and thus to be a fundamental challenge to the welfare state. However, studies of how these rules are implemented and what become the de-facto outcomes hereof remain scarce. We address this research gap, by examining domestic responses to and outcomes of dynamic EU rules. Based on a unique set of administrative data, we do so for all EU citizens residing in the universalistic, tax-financed welfare state of Denmark between 2002-2013. We find that domestic responses have been restrictive and outcomes limited.