The workshop organised by the Robert Schuman Centre for Advanced Studies (RSCAS) on 24 April 2015, is part of a joint research project of the European Parliament and European University Institute (EUI), on the History of Budgetary Powers: Institutional conflicts and achievements. This workshop follows the approach of the RSCAS, offering a platform for policy reflections between academics and practitioners. Its aim is not to give policy advice, but to stimulate an open discussion on the problems of the EU's own resources problems, which have not only an economic but also an important institutional dimension. This publication, gathers the contributions of the various participants.