This article, based on a thesis defended at the European University Institute in October 2020, pursues a twofold aim: first, to apply the error framework, which is an economic analysis tool used in competition law, to State aid, and to discover what determines the expected cost of error in this area. Second, to reflect on whether this expected cost might be reduced and to provide ideas where improvements might be sought. For this purpose, it verifies whether errors in State aid assessment at the Commission and the national level are rare, cheap and effectively corrected. On the basis of this analysis, which constitutes an original assessment of the reform of Procedural Regulation and of the GBER, it draws useful conclusions and formulates some recommendations as to how to increase accuracy at a reasonable cost.
Keywords: State aid procedure; error in assessment; notification procedure; GBER.