Single Rulebook

The banking union in the European Union is the transfer of responsibility for banking policy from the national to the EU level in several countries of the European Union, initiated in 2012 as a response to the Eurozone crisis. The motivation for banking union was the fragility of numerous banks in the Eurozone, and the identification of vicious circle between credit conditions for these banks and the sovereign credit of their respective home countries. In several countries, private debts arising from a property bubble were transferred to sovereign debt as a result of banking system bailouts and government responses to slowing economies post-bubble. Banking union was formulated as a policy response to this challenge.

As of 2014, the banking union mainly consists of two main initiatives, the Single Supervisory Mechanism and Single Resolution Mechanism, which are based upon the EU's "single rulebook" or common financial regulatory framework. The agreement creating the SRM entered into force on 1 January 2016. As of January 2016, all eurozone member states participate in the SRM.

The integration of bank regulation has long been sought by EU policymakers, as a complement to the internal market for capital and, from the 1990s on, of the single currency. However, powerful political obstacles including the willingness of member states to retain instruments of financial repression and economic nationalism led to the failure of prior attempts to create a European framework for banking supervision, including during the negotiation of the Maastricht Treaty in 1991 and of the Treaty of Nice in 2000. During the 2000s, the emergence of pan-European banking groups through cross-border mergers and acquisitions (such as the purchases of Abbey National by Santander Group, HypoVereinsbank by UniCredit and Banca Nazionale del Lavoro by BNP Paribas) led to renewed calls for banking policy integration, not least by the International Monetary Fund, but with limited policy action beyond the creation of the Committee of European Banking Supervisors in 2004.

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