Impact of Brexit on voting power in Council of the European Union

Abstract

The United Kingdom has left the European Union on 31 January 2020. Discussions that preceded such a move were conducted in three dimensions: they pertained a post-Brexit relationship between the UK and EU, future conduct within the UK and the one within the EU. Whilst public discourse has been dominated by the first two, this paper approaches the third one – on how Brexit has affected relationships between remaining 27 EU Member States. Stemming from the calculation of Banzhaf indices, it assesses the impact of Brexit on the voting power of remaining Member States in the Council of the EU – arguably the most important body within the EU institutional architecture – and identifies which countries are going to record the most significant gains and losses in this respect.