Harmonisation of social security systems is back on the agenda of European policy makers. However, the introduction of a harmonised scheme poses severe challenges. In this article, the ‘Centrum voor Sociaal Beleid’ from the University of Antwerp explores some options and difficulties associated with the implementation of a harmonised minimum income protection scheme for the elderly. Their findings confirm that it is one thing to be in favour of a harmonised scheme of minimum income protection, but another to design a realistic and politically feasible proposal.