Voting in the Council of the European Union

The procedures for voting in the Council of the European Union are described in the treaties of the European Union. The Council of the European Union (or simply "Council" or "Council of Ministers") has had its voting procedure amended by subsequent treaties and currently operates on the system set forth in the Treaty of Lisbon.

This section presents the former qualified majority voting systems employed in the Council of the European Union, and its predecessor institutions. While some policy areas require unanimity among Council members, for selected policy areas qualified majority voting has existed right from the start. All major treaties have shifted some policy areas from unanimity to qualified majority voting.

Whenever the community was enlarged, voting weights for new members were defined and thresholds re-adjusted by accession treaties. After its inception in 1958, the most notable changes to the voting system occurred:

All systems prescribed higher thresholds for passing acts that were not proposed by the Commission. Member states have to cast their votes en bloc (i.e., a member state may not split its votes). Hence, the number of votes rather describes the weight of a member's single vote.

The analysis of the distribution of voting power under different voting rules in the EU Council often requires the use of complex computational methods that go beyond a mere calculation of vote share, such as the Shapley-Shubik index or the Banzhaf measure.

According to Article 148 of the Treaty establishing the European Economic Community (EEC Treaty), acts of the Council required for their adoption:

The values above are related to the EU-6, the founding member states. The treaty allocated the votes as follows:

Under this system, Luxembourg had no voting power for acts proposed by the Commission.

Article 148 of the EEC Treaty, specifying the qualified majority voting system of the Council, was amended by Article 8 of the Accession Treaty regulating the enlargement of the community by Denmark, Ireland, and the United Kingdom. Acts of the Council now required for their adoption:

...
Wikipedia