Banking Law and Multilateral Financial Governance — Spain

1. Introduction

Multilateral financial governance in Spain refers to the system through which Spanish financial institutions, the Banco de España, the Spanish government and other national authorities operate within a network of European and international financial institutions.

Spain's banking system is not governed solely by domestic Spanish law. Because Spain is a euro-area Member State, its financial governance is closely integrated with:

the European Central Bank (ECB);

the European System of Central Banks (ESCB);

the Eurosystem;

the Single Supervisory Mechanism (SSM);

the Single Resolution Mechanism (SRM);

the European Banking Authority (EBA);

the European Stability Mechanism (ESM);

the European Commission;

the International Monetary Fund (IMF); and

other international financial institutions.

This structure became particularly important after the European sovereign-debt and banking crisis. Spain's 2012 banking-sector assistance programme demonstrated that banking stability could no longer be treated solely as a domestic matter. The crisis contributed to the development of stronger European banking supervision and resolution arrangements.

2. Meaning of Multilateral Financial Governance

Multilateral financial governance means that financial institutions and governments operate within rules established or coordinated by several jurisdictions or international institutions.

For Spain, this produces several layers:

Spanish law

↓

EU banking legislation

↓

ECB monetary and supervisory framework

↓

Banking Union

↓

European financial authorities

↓

International financial institutions

The important point is that these layers do not necessarily replace one another.

They operate simultaneously.

3. Spanish Institutional Framework

The principal Spanish institutions include:

Banco de España

Spain's central bank and national competent authority for numerous banking and financial functions.

Ministry of Economy, Trade and Enterprise

Responsible for important aspects of national financial policy and legislation.

CNMV

The Spanish securities-market supervisor.

FROB

The Spanish resolution authority involved in bank restructuring and resolution.

These institutions operate within the wider European framework.

4. Banco de España and the Eurosystem

Spain is part of the euro area.

Therefore, the Banco de España is a member of the Eurosystem, consisting of the ECB and the national central banks of euro-area countries.

This has major legal consequences.

Spain does not independently determine:

the ECB policy interest rate;

euro-area monetary-policy operations;

the overall Eurosystem monetary stance; or

the euro's central monetary framework.

Instead, Spanish monetary and financial governance operates within the institutional structure created by the EU Treaties and the Statute of the ESCB and ECB.

5. The Single Supervisory Mechanism

The Single Supervisory Mechanism (SSM) is one of the most important examples of multilateral financial governance affecting Spain.

It was established by Regulation (EU) No. 1024/2013.

The ECB directly supervises significant credit institutions, while national authorities such as Banco de España participate in the supervisory system and continue to exercise responsibilities assigned to them under EU law.

The purpose is to reduce fragmentation in banking supervision.

A large Spanish banking group can therefore be subject to decisions by a European institution rather than solely by a Spanish regulator.

6. Why the SSM Matters

Before Banking Union, supervision was largely organized at national level.

That created a potential problem:

European banking activity

but

national supervision.

The financial crisis showed that weaknesses in one Member State's banking system could affect other countries.

The SSM responds by creating common supervisory structures.

For Spain, this means that major banks are supervised within a common European framework.

7. Prudential Supervision

Multilateral governance covers prudential requirements such as:

capital;

liquidity;

leverage;

credit risk;

market risk;

operational risk;

governance;

internal controls; and

risk-management systems.

Spanish banks therefore operate under a combination of:

EU prudential legislation

and

Spanish implementing and supervisory rules.

The Capital Requirements Regulation and Capital Requirements Directive form an important part of this framework.

8. Single Resolution Mechanism

Supervision is only one part of Banking Union.

A bank can be adequately supervised and nevertheless fail.

The Single Resolution Mechanism (SRM) provides a European framework for dealing with failing banks.

The Single Resolution Board (SRB) is the central European resolution authority for institutions within its jurisdiction.

Spain also has FROB, which participates in the national and European resolution architecture.

The objective is to allow failing banks to be resolved while protecting critical functions and reducing the need for taxpayer-funded bailouts.

9. Banco Popular as a Major Spanish Example

The resolution of Banco Popular Español in June 2017 is one of the clearest examples of multilateral financial governance in Spain.

The process involved:

ECB

→ assessment that Banco Popular was failing or likely to fail

SRB

→ adoption of the resolution scheme

European Commission

→ endorsement of the scheme

Banco Santander

→ acquisition through the resolution process.

The litigation that followed produced a large body of EU banking-law jurisprudence. The Court of Justice has continued to examine questions concerning the resolution process, valuations, investor rights, confidentiality and institutional responsibilities.

10. European Stability Mechanism

The European Stability Mechanism (ESM) is another important component.

During the euro-area crisis, Spain received financial assistance for the restructuring of its banking sector.

The programme was not a traditional sovereign bailout in the same form as some other euro-area assistance programmes.

Instead, assistance was directed toward recapitalization and restructuring of the Spanish banking system.

This experience demonstrated how national banking problems could trigger multilateral financial assistance.

11. International Monetary Fund

Spain also participates in the IMF system.

The IMF's role differs from that of the ECB.

ECB

Central bank of the euro area and monetary authority within the Eurosystem.

IMF

International financial institution concerned with international monetary cooperation, surveillance and financial assistance.

ESM

Euro-area financial-stability mechanism.

These institutions therefore have different legal mandates.

12. European Banking Authority

The European Banking Authority (EBA) contributes to the harmonization of banking regulation across the EU.

Its functions include:

developing regulatory technical standards;

issuing guidelines;

promoting supervisory convergence;

conducting stress tests;

monitoring banking risks; and

supporting consistent implementation of EU banking legislation.

The EBA is particularly important because Banking Union does not mean that every aspect of banking supervision is performed by the ECB.

The EBA helps maintain consistency across the wider EU.

13. European Systemic Risk Board

The European Systemic Risk Board (ESRB) focuses on systemic financial risks.

Its perspective is different from that of a supervisor examining one bank.

The ESRB considers risks affecting the financial system as a whole.

Examples include:

housing bubbles;

excessive credit growth;

sovereign-bank connections;

market-wide liquidity risks; and

systemic leverage.

Spain participates in this broader macroprudential governance system.

14. Macroprudential Governance in Spain

Spain's macroprudential framework includes the Consejo de Estabilidad Financiera (CNSF), which coordinates relevant national authorities.

Banco de España also has important macroprudential responsibilities.

Potential tools include:

capital buffers;

borrower-based measures;

sectoral requirements;

systemic-risk measures; and

other prudential instruments permitted by EU law.

This represents a major change from purely institution-by-institution supervision.

15. European Deposit Insurance

Deposit protection is another part of multilateral financial governance.

Spain has a national Deposit Guarantee Scheme, operating within the EU deposit-guarantee framework.

The basic policy is that eligible deposits are protected up to the applicable legal limit.

Deposit protection reduces the risk that the failure of one bank produces widespread panic among depositors.

It also supports financial stability.

16. Bank Recovery and Resolution

EU banking law requires institutions to prepare for possible financial distress.

Banks may need:

recovery plans;

resolution planning;

minimum loss-absorbing capacity;

internal governance arrangements; and

contingency arrangements.

These requirements are designed to ensure that authorities do not have to improvise when a large bank becomes unstable.

17. MREL

The Minimum Requirement for Own Funds and Eligible Liabilities (MREL) is a key resolution mechanism.

The idea is that banks should maintain sufficient liabilities capable of absorbing losses and, where necessary, supporting recapitalization during resolution.

This reduces dependence upon direct public recapitalization.

For Spanish banks, MREL therefore connects ordinary prudential supervision with European resolution planning.

18. Sovereign-Bank Nexus

One major purpose of Banking Union is to reduce the so-called sovereign-bank nexus.

The problem can arise when:

government finances weaken

↓

domestic bank holdings of government debt lose value

↓

bank balance sheets weaken

↓

government is pressured to support banks

↓

government finances weaken further.

The reverse can also occur.

Multilateral financial governance attempts to reduce this feedback loop through common supervision, resolution and capital requirements.

19. Spain and the European Financial Stability Architecture

Spain's modern financial governance can therefore be understood as:

Banco de España

ECB

SSM

SRB

FROB

EBA

ESRB

ESM

European Commission

IMF and other international institutions

The institutions have different powers, so they cannot be treated as interchangeable.

20. Legal Allocation of Powers

A central principle of multilateral governance is that each institution must operate within its legally defined competence.

For example:

ECB

Monetary policy and specified banking-supervisory powers.

SRB

Resolution powers under the SRM Regulation.

European Commission

Specific EU-law responsibilities, including endorsement of certain resolution decisions.

Banco de España

National central-bank and supervisory functions allocated under EU and Spanish law.

FROB

Spanish resolution functions within the European framework.

EBA

EU-wide regulatory and supervisory convergence functions.

This allocation prevents institutional overlap from becoming uncontrolled discretion.

21. Judicial Review

Multilateral financial governance is subject to judicial review.

The EU courts can examine whether:

an institution had legal competence;

procedural requirements were followed;

reasons were given;

proportionality was respected;

fundamental rights were protected; and

relevant legal conditions were satisfied.

The Banco Popular litigation has become a major source of jurisprudence concerning these questions.

22. Case Law

Spain's multilateral financial-governance case law is heavily influenced by EU judicial decisions.

The following cases are particularly relevant.

Case 1 — Gauweiler and Others v Deutscher Bundestag, C-62/14

This Grand Chamber judgment concerned the ECB's Outright Monetary Transactions programme.

The Court considered the boundary between monetary policy and economic policy.

It held that the ECB's programme could fall within monetary policy where its objective and instruments were properly connected to the Eurosystem's monetary-policy mandate, subject to Treaty limitations.

Relevance to Spain

The case establishes an important constitutional principle:

European monetary institutions can exercise only the powers conferred upon them by EU law.

Spain's participation in euro-area financial governance therefore operates within the same legal limits.

23. Case 2 — Weiss and Others, C-493/17

The Weiss case concerned the ECB's Public Sector Purchase Programme.

The Court of Justice examined:

monetary-policy competence;

proportionality;

the prohibition of monetary financing; and

the relationship between ECB measures and EU Treaty requirements.

Importance

The case demonstrates that multilateral financial governance is not unlimited.

European institutions remain subject to Treaty-based legal constraints.

For Spain, this is relevant because Spanish banks and financial markets are directly affected by ECB monetary-policy measures.

24. Case 3 — Landeskreditbank Baden-Württemberg v ECB, C-450/17 P

This case concerned the Single Supervisory Mechanism.

Landeskreditbank argued that it should not be subject to direct ECB supervision because of the characteristics of its business.

The Court rejected the challenge.

Importance for Spain

The judgment confirms the strength of the European supervisory architecture.

A bank's national identity does not automatically determine whether European supervision applies.

For Spanish banks, significant institutions can therefore be subject to direct ECB supervision even though they are incorporated under Spanish law.

25. Case 4 — Commission v SRB, C-551/22 P

This case arose from the Banco Popular resolution.

The Grand Chamber addressed which act in the resolution process was open to challenge.

The Court held that the action brought directly against the SRB's resolution scheme was inadmissible in the circumstances because the legally challengeable act was the Commission's endorsement of the scheme.

Importance

This decision illustrates a fundamental principle of multilateral governance:

Legal accountability follows the institutional structure established by EU law.

It is not enough to identify a decision operationally; one must identify which legal act produces the relevant legal effects.

26. Case 5 — García Fernández and Others v Commission and SRB, C-541/22 P

This 2024 Court of Justice judgment concerned the Banco Popular resolution.

The Court examined issues including:

resolution objectives;

conditions for resolution;

valuation;

confidentiality;

access to documents;

statements to the press; and

obligations of the SRB and Commission.

The Court dismissed the appeal.

Importance

The decision illustrates the legal complexity of multilateral bank resolution.

Multiple institutions may participate, but each institution remains subject to its own statutory responsibilities.

27. Case 6 — Algebris (UK) and Anchorage Capital Group v Commission, T-570/17

This General Court case concerned the Banco Popular resolution.

The Court considered issues involving:

delegation of powers;

reasoning;

good administration;

the right to be heard;

valuation;

and property rights.

Importance

The case shows that financial stability measures remain subject to administrative-law principles.

Even during a banking crisis, European authorities must operate within their legal powers and procedural obligations.

28. Case 7 — Del Valle Ruíz and Others v SRB, Joined Cases T-302/20, T-303/20 and T-307/20

This General Court litigation concerned compensation following the Banco Popular resolution.

The Court examined:

right to property;

right to be heard;

effective judicial protection;

valuation;

and independence of the valuer.

Importance

Resolution does not eliminate legal protection for shareholders and creditors.

The legal system must still determine whether affected parties have received the treatment required by EU resolution law.

29. Case 8 — Banco Santander (Resolution of Banco Popular III), C-687/23

This 2025 Court of Justice case concerned claims by purchasers of Banco Popular capital instruments.

The Court held that certain pre-resolution claims for nullity and damages could be enforced against Banco Santander as universal successor to Banco Popular.

Importance

The judgment illustrates the interaction between:

bank resolution

and

ordinary private-law claims.

Resolution does not necessarily erase every pre-existing legal relationship.

30. Case 9 — ACMO and Others v SRB, T-330/20

The General Court examined the SRB's decision refusing compensation to certain shareholders and creditors affected by Banco Popular's resolution.

The case considered the difference-in-treatment valuation and the independence of the valuer.

Importance

Independent valuation is central to resolution governance.

Affected investors must be assessed under the legal methodology required by the SRM framework.

31. Case-Law Summary

32. Banco Popular as a Governance Model

The Banco Popular episode demonstrates how multilateral financial governance functions in practice.

The sequence was broadly:

ECB

↓

assessment of failing or likely-to-fail condition

↓

SRB

↓

resolution scheme

↓

European Commission

↓

endorsement

↓

Banco Santander

↓

transfer/acquisition

This is fundamentally different from a purely national bank rescue.

Multiple European institutions exercised legally distinct functions.

33. Transparency and Confidentiality

Financial governance requires a difficult balance.

On one side:

transparency

helps affected parties understand government and regulatory action.

On the other:

confidentiality

can be necessary to prevent a bank run or destabilizing disclosure during a resolution process.

The Banco Popular litigation repeatedly addressed this tension.

The Court's case law recognizes that resolution authorities may have legitimate confidentiality obligations, while still remaining subject to legal and procedural requirements.

34. Right to Property

Bank resolution can directly affect shareholders and creditors.

Writing down shares or converting instruments into equity can therefore engage property rights.

European courts have examined whether such measures comply with EU fundamental-rights protections.

The legal framework attempts to balance:

financial stability

against

investor protection.

Neither interest automatically overrides the other.

35. Right to Be Heard

Administrative financial decisions can have major economic consequences.

The right to be heard therefore becomes relevant where EU law requires it.

However, resolution proceedings can be extremely time-sensitive.

A bank may fail within hours or days.

The legal framework therefore has to balance procedural rights against the need to prevent systemic contagion.

Banco Popular litigation has generated extensive discussion of this issue.

36. Valuation Governance

Valuation is particularly important in multilateral financial governance.

A resolution authority may need to determine:

bank assets;

liabilities;

expected losses;

liquidation value;

transfer value; and

whether shareholders or creditors would have received a better outcome under ordinary insolvency.

Errors in valuation can therefore have major legal consequences.

The Banco Popular litigation has produced substantial EU jurisprudence concerning valuation methodologies and the independence of valuation experts.

37. Stress Testing

Multilateral financial governance also relies on stress testing.

European authorities may examine how banks would perform under adverse scenarios involving:

recession;

unemployment;

property-price declines;

interest-rate changes;

market volatility;

credit losses; and

liquidity pressure.

Stress testing helps authorities identify weaknesses before they become actual failures.

38. Cross-Border Banking

Spanish banks operate across multiple jurisdictions.

A Spanish banking group may have subsidiaries or branches in:

other EU Member States;

Latin America;

the United Kingdom;

the United States; and

other regions.

Multilateral governance becomes particularly important because financial problems can cross borders rapidly.

Supervisory colleges, European authorities and international cooperation mechanisms therefore help coordinate oversight.

39. IMF and International Standards

Although the IMF does not supervise ordinary Spanish banks in the same way as the ECB, IMF surveillance can influence the broader financial-policy environment.

Spain also participates in international standard-setting through institutions and bodies dealing with:

banking supervision;

financial stability;

anti-money laundering;

resolution;

accounting; and

systemic risk.

This creates another level of multilateral governance beyond the European Banking Union.

40. Financial Stability and Crisis Management

Multilateral governance is particularly valuable during a crisis.

A major Spanish bank failure could affect:

depositors;

other Spanish banks;

European banks;

sovereign borrowing costs;

payment systems;

investors; and

the wider euro area.

A purely national response may therefore be inadequate.

The Banking Union attempts to ensure that major financial institutions can be managed using common European tools.

41. Interaction with Spanish Law

European governance does not eliminate Spanish banking law.

Instead, Spanish law operates within the EU framework.

For example:

EU Regulation

↓

Spanish implementing legislation

↓

Banco de España / FROB / CNMV

↓

Individual bank

The precise relationship depends upon the particular EU instrument.

EU regulations generally apply directly, while directives require national implementation.

42. Regulatory Coordination

The Spanish system therefore depends heavily upon coordination.

A large Spanish bank may interact simultaneously with:

ECB supervisors;

Banco de España;

SRB;

FROB;

EBA;

CNMV;

European Commission; and

other national regulators.

Effective governance requires these authorities to communicate while remaining within their separate legal mandates.

43. Benefits and Legal Challenges

Multilateral governance can produce:

Greater supervisory consistency

Banks operating across borders are subject to common standards.

Stronger crisis-management capacity

Resolution can be coordinated at European level.

Reduced national fragmentation

Common rules reduce differences between Member States.

But it can also create:

Institutional complexity

Several regulators may participate in one decision.

Accountability questions

It can become difficult for affected parties to identify which institution made which legally effective decision.

Procedural complexity

Litigation may involve multiple EU institutions and national authorities.

Competence disputes

Institutions may disagree about the legal boundaries of their powers.

The Banco Popular cases illustrate several of these challenges.

44. Future Developments

Multilateral financial governance is increasingly affected by digital finance.

Relevant areas include:

digital payments;

crypto-assets;

stablecoins;

artificial intelligence;

cloud outsourcing;

cybersecurity;

operational resilience;

tokenized securities; and

potentially the digital euro.

The ECB and EU institutions are consequently addressing financial stability not only through traditional banking rules but also through digital-finance regulation.

45. Practical Example

Suppose a major Spanish bank experiences severe liquidity problems.

Under a purely national system:

Banco de España → Spanish government → national resolution process

might dominate.

Under the modern European system:

ECB

assesses the bank from the supervisory perspective.

↓

SRB

determines whether resolution conditions are met and designs the relevant resolution action.

↓

European Commission

performs its legally defined role.

↓

FROB

implements or supports national aspects of the resolution process.

↓

National and EU courts

provide judicial review where legally available.

This is multilateral financial governance in practical operation.

46. Overall Governance Structure

Spain's framework can be summarized as:

Each level addresses different financial risks.

47. Conclusion

Banking Law and Multilateral Financial Governance in Spain is fundamentally the law of shared financial authority.

Spain remains responsible for important national banking functions, but its financial system operates within an extensive European institutional framework.

The most important components are:

ECB monetary policy

Single Supervisory Mechanism

Single Resolution Mechanism

Banco de España

FROB

EBA

ESRB

ESM

and broader international financial institutions such as the IMF.

The Banco Popular resolution is particularly important because it demonstrates how these institutions can operate together in a real Spanish banking crisis. The subsequent case law has clarified questions concerning valuation, confidentiality, investor rights, judicial review, institutional competence and the legal effects of resolution decisions.

The principal cases include:

Gauweiler — C-62/14

Weiss — C-493/17

Landeskreditbank Baden-Württemberg v ECB — C-450/17 P

Commission v SRB — C-551/22 P

García Fernández and Others v Commission and SRB — C-541/22 P

Algebris v Commission — T-570/17

Del Valle Ruíz and Others v SRB — T-302/20, T-303/20 and T-307/20

Banco Santander (Resolution of Banco Popular III) — C-687/23

ACMO and Others v SRB — T-330/20

The core legal principle is:

Multilateral financial governance does not eliminate national banking law; it places national banking institutions inside a coordinated European and international system of legally allocated powers, common standards, supervision, crisis management and judicial review.

For Spain, this means that the stability of the banking system is no longer treated exclusively as a domestic matter. European monetary policy, common supervision, common resolution and international financial cooperation form an integrated governance structure, while Spanish institutions remain essential participants in implementing and applying that structure.