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Banking Union Before Euro Adoption: Flak Jacket or Straitjacket?

All European Union members, except Denmark and the United Kingdom, are expected under EU treaties to eventually adopt the euro. Six Central and Eastern EU members – Bulgaria, Croatia, Czech Republic, Hungary, Poland and Romania – are yet to do so.

In the meantime, these countries have a decision to make: Should they opt in to the Banking Union before adopting the euro? Such a move may offer greater insurance against shocks, but at a certain cost to policy flexibility.  In a recent study, we explore some of the trade-offs that countries need to weigh.

Banking Union origins

Rationale: The recent crisis led to the realization that a common currency area needed centralized bank supervision and resolution to overcome financial fragmentation and break the link between bank and sovereign stress.

Elements: The two main arms of the Banking Union are the Single Supervisory Mechanism and the Single Resolution Mechanism. The first aims to raise the credibility and quality of bank supervision by removing the distinction between home and host supervisors. The second aims to sever the links between bank and sovereign stress by unifying the bank resolution and restructuring frameworks across countries and providing a common, industry-funded backstop. The other two elements – a common fiscal backstop and common deposit insurance – are also essential to complete the Banking Union.

Benefits: Once the Banking Union is complete, it is expected to raise the quality of supervision, lower bank compliance costs, remove existing barriers to cross-border banking activity, lower resolution costs, and ultimately, lower bank funding costs.

Missing pieces

Not all key elements of the Banking Union are yet in place. With the SSM and SRM now operational, an effective common fiscal backstop is still needed to break the sovereign-bank links. The European Stability Mechanism (ESM) is currently acting as de facto common fiscal backstop for euro area banks, but its powers are limited and the threshold for access is high. The industry-financed Single Resolution Fund (SRF) will be fully funded and mutualized only by 2024. Finally, there is still no pan-European deposit guarantee scheme.

EUR banking union.figure 1rev

Different rules

Non-euro area members of the Banking Union would not be treated in the same way as the euro area members. Non-euro area countries are not members of the European Central Bank’s (ECB) Governing Council, which is charged with adopting decisions drafted by the SSM. Further, non-euro area opt-ins will not be eligible for direct bank recapitalization by the ESM and would not have direct access to the ECB liquidity facilities. 

EUR banking union.figure 2rev


The calculus of the Banking Union opt-in decision for non-euro area members is complex and there are many moving parts. One way to look at it is whether the support they would get from the Banking Union makes it worthwhile to shift decision powers from the national level:

EUR banking union.chart.rev

Decisive factors  

The cost-benefit analysis could lead to different conclusions for different countries, depending on their fundamentals. It may be the case for some countries that an immediate boost to the quality and credibility of bank supervision and eventually having access to larger backstops would outweigh all other considerations. For others, the attractiveness of early opt-in will likely hinge on the Banking Union’s ability to establish a fully equivalent treatment of euro area and non-euro area members, as well as its credibility and operational excellence.