Differences in Member States' economic development and national social protection systems can translate into significant differences in the substantive social rights of EU migrant citizens. The substantive rights of economically inactive EU migrant citizens are dependent on the ‘export’ of social rights from their country of origin to the Member State of destination, in particular during the initial phase of their residence in a new Member State as a jobseeker or a pensioner. This paper demonstrates that EU citizens' social rights are substantively stratified, not only by economic status, but also according to the Member State of origin and destination. Stratified social rights, it is argued, generate unequal opportunities to free movement and eo ipso challenge the very concept of EU citizenship. The paper concludes with a proposal for a European Minimum Income Scheme to at least partially overcome the shortcomings of existing EU citizenship.