Banking Law and Constitutional Procedure in Spain

Introduction

Banking law in Spain operates within a constitutional, administrative, judicial, and European Union framework. “Constitutional procedure” in banking law concerns the procedural safeguards that public authorities must respect when regulating, supervising, sanctioning, restructuring, or resolving banks. It also concerns the procedures through which banks, shareholders, depositors, borrowers, and other affected persons can challenge public decisions.

The Spanish Constitution of 1978 does not contain a separate chapter on banking procedure. Instead, constitutional protection comes from provisions concerning effective judicial protection, legality, property, administrative procedure, judicial review, and judicial independence. Article 24 guarantees effective judicial protection and protection against defenselessness; Articles 103–106 impose legality and procedural requirements on public administration and subject administrative action to judicial control; and Article 117 protects judicial independence.

Spanish banking procedure must also be understood within the EU Banking Union. Major Spanish banks can therefore be affected by decisions of the European Central Bank (ECB), Single Resolution Board (SRB), European Commission, Banco de España, and Spanish courts.

Constitutional and Legal Framework

1. Article 24 – Effective Judicial Protection

Article 24 of the Constitution is particularly important. It guarantees everyone effective protection from courts and tribunals in exercising legitimate rights and interests and prohibits situations of procedural defenselessness. It also protects important procedural guarantees such as access to the legally predetermined judge, defence, legal assistance, evidence, and proceedings without undue delay.

In banking matters, Article 24 can become relevant where a bank, shareholder, customer, director, or other affected person challenges an administrative sanction, judicial decision, enforcement procedure, or another governmental measure.

It does not mean that every adverse banking decision constitutes a constitutional violation. Normally, the claimant must demonstrate that a procedural defect affected a constitutionally protected right.

2. Articles 103 and 105 – Administrative Legality and Procedure

Article 103 requires public administration to serve the general interest objectively and to operate in full accordance with law.

Article 105 is even more directly procedural. It requires legislation to regulate administrative procedures, including participation in the preparation of administrative provisions, access to administrative records subject to specified exceptions, and a hearing for interested parties where appropriate.

Consequently, when Spanish banking authorities exercise administrative powers, procedural fairness cannot simply be ignored because financial regulation is technically complicated.

This principle is especially relevant to supervisory sanctions, authorization decisions, administrative penalties, and certain regulatory measures.

3. Article 106 – Judicial Review

Article 106 establishes another major constitutional safeguard: courts control regulatory powers and the legality of administrative action, including whether administrative powers are exercised for their legally authorized purposes.

Article 106(2) additionally establishes, subject to statutory conditions, a principle of compensation for injury caused by the functioning of public services.

Thus, regulatory independence does not mean freedom from legal accountability.

4. Article 117 – Independent Courts

Article 117 provides that judges and magistrates are independent and subject only to the rule of law. Judicial power to judge cases and enforce judgments belongs to courts determined according to legal rules governing jurisdiction and procedure.

This matters because disputes concerning banking supervision, sanctions, contracts, insolvency, consumer protection, and administrative decisions ultimately depend upon independent judicial determination.

5. Property Rights

Article 33 recognizes private property while allowing legislation to define its content according to its social function.

Property protection can become important where banking measures interfere with shares, securities, investments, or other proprietary interests.

The constitutional property guarantee must now be considered alongside EU fundamental-rights protection, particularly in Banking Union resolution cases.

Banking Administrative Procedure

A simplified Spanish banking administrative process may involve:

Investigation or supervision → administrative proceedings → hearing/representations → reasoned decision → administrative or judicial challenge → constitutional/EU review where applicable.

Different legislation applies depending on the measure concerned. Ordinary administrative procedure is principally governed by Spain's administrative procedural legislation, while banking-specific statutes and EU regulations establish specialized rules.

An important constitutional distinction must therefore be maintained between ordinary administrative legality and fundamental-rights review. Not every breach of an administrative rule automatically becomes a constitutional violation.

Constitutional Procedure and EU Banking Union

Spanish banking constitutional procedure has acquired a significant European dimension.

Following the creation of the Banking Union, responsibilities are divided among national and European institutions. The ECB has important prudential supervisory responsibilities, while the SRB plays the central role in resolution within the Single Resolution Mechanism.

This creates a multilevel system:

Spanish Constitution → Spanish banking/administrative legislation → EU law → EU institutions → Spanish and EU courts.

Consequently, determining the correct institution, procedure, remedy, and court can itself become a major legal issue.

The Banco Popular litigation provides the clearest example.

Important Case Law

1. Banco Popular Resolution Cases – General Court, 1 June 2022

The resolution of Banco Popular Español became one of the most significant procedural disputes arising from the Banking Union.

On 7 June 2017, the SRB adopted the resolution scheme for Banco Popular, which was endorsed by the European Commission. Banco Popular's shares were ultimately transferred to Banco Santander following the resolution measures. Numerous shareholders and investors challenged the process.

In a group of judgments delivered on 1 June 2022—including T-481/17, Fundación Tatiana Pérez de Guzmán el Bueno and SFL v SRB, T-510/17, Del Valle Ruiz and Others, T-523/17, Eleveté Invest Group, T-570/17, Algebris, and T-628/17, Aeris Invest—the General Court dismissed the annulment actions.

These proceedings addressed fundamental procedural questions concerning the right to be heard, property rights, reasons for decisions, judicial challenge, valuation, and the legality of resolution procedures. The litigation illustrates that emergency banking intervention remains subject to legal scrutiny even where regulators must act extremely rapidly.

2. Fundación Tatiana Pérez de Guzmán el Bueno and SFL v SRB, T-481/17

This case deserves separate attention because its stated legal issues directly included the right to be heard, right to property, obligation to state reasons, and application of Articles 18, 20 and 24 of Regulation 806/2014.

The case demonstrates an important principle: banking-resolution procedure involves balancing individual procedural protections against the extraordinary need for authorities to intervene quickly where a bank is failing or likely to fail.

3. Del Valle Ruiz and Others v Commission and SRB, T-510/17

This was another Banco Popular challenge considered by the General Court in the 2022 group of judgments.

The court rejected the challenge to the resolution arrangements. Together with the related cases, it illustrates how EU judicial review provides procedural accountability over decisions affecting Spanish banks when the operative measure comes from Banking Union institutions.

4. Aeris Invest v Commission and SRB, T-628/17

Aeris Invest similarly challenged the Banco Popular resolution arrangements.

Its inclusion among the major Banco Popular judgments is significant because the litigation required the General Court to examine investor challenges within the framework of the Single Resolution Mechanism. The actions were ultimately dismissed.

These proceedings show that constitutional-type guarantees concerning property and procedural fairness increasingly interact with EU Charter rights and EU judicial procedure.

5. Spanish Constitutional Court, STC 179/2023

STC 179/2023 provides a particularly useful Spanish constitutional connection to Banco Popular.

The Constitutional Court recorded that the ECB had considered Banco Popular failing on 6 June 2017, leading to its resolution under Regulation 806/2014 and the eventual transfer of its shares to Banco Santander. The case concerned a later administrative sanction imposed on Santander as successor to Banco Popular for a very serious infringement under Spain's anti-money-laundering legislation.

The decision demonstrates how bank succession and resolution can generate later constitutional procedural questions concerning administrative penalties and responsibility.

6. Spanish Constitutional Court, STC 4/2017

STC 4/2017 of 16 January 2017 arose from an amparo proceeding concerning judicial decisions involving Banco Popular Español.

Its broader importance lies in the constitutional function of the recurso de amparo. Where ordinary judicial proceedings allegedly violate protected fundamental rights, constitutional review may become available once the applicable procedural requirements and remedies have been satisfied.

Therefore, banking disputes are not constitutionally insulated simply because their underlying subject matter is commercial or financial.

Main Constitutional Principles

From these constitutional provisions and cases, several principles can be identified.

First, legality requires banking authorities to exercise only powers conferred upon them by Spanish or EU law.

Second, procedural fairness requires appropriate opportunities to participate or defend interests where the applicable legal framework requires them.

Third, reasoned decision-making is particularly important because affected parties need sufficient information to understand and, where legally available, challenge governmental action.

Fourth, effective judicial protection means access to meaningful judicial mechanisms cannot arbitrarily be eliminated.

Fifth, proportionality becomes important when public intervention significantly affects private economic or property interests.

Finally, financial stability can justify exceptional procedures, particularly in bank resolution. However, urgency does not create a constitution-free zone. The Banco Popular litigation demonstrates that emergency resolution decisions remain reviewable against statutory and fundamental-rights standards.

Constitutional Court and Ordinary Courts

The Constitutional Court should not be treated as an additional ordinary appeal court for every banking dispute.

Ordinary courts primarily resolve questions involving contracts, administrative legality, enforcement, insolvency, consumer disputes, and other conventional banking litigation.

The Constitutional Court intervenes principally where a genuine constitutional question exists—for example, an alleged violation of a fundamental right capable of protection through amparo, or constitutional review of legislation through the procedures established by the Constitution.

At EU level, Spanish courts must additionally respect EU law, and disputes concerning decisions of EU Banking Union institutions may belong before the EU Courts.

This creates an important procedural distinction:

Banco de España or Spanish authority → Spanish administrative/judicial review

versus

ECB/SRB/EU Commission measure → EU-law remedies and potentially EU Courts.

The identity of the decision-maker therefore strongly influences the correct procedural route.

Conclusion

Banking law and constitutional procedure in Spain are closely connected through the principles of legality, procedural fairness, effective judicial protection, property protection, reasoned administrative action, and independent judicial review. Articles 24, 103, 105, 106 and 117 of the Spanish Constitution provide especially important constitutional foundations.

At the same time, Spain's membership in the EU Banking Union means that constitutional banking procedure can no longer be understood exclusively through Spanish law. Decisions concerning major Spanish banks may originate from the ECB, SRB, Commission, or national authorities and therefore produce different procedural and judicial routes.

The Banco Popular litigation, including T-481/17, T-510/17, T-523/17, T-570/17 and T-628/17, together with Spanish Constitutional Court decisions such as STC 179/2023 and STC 4/2017, demonstrates the central principle: financial stability gives banking authorities extensive powers, but those powers remain bounded by legally prescribed procedures, fundamental rights, and judicial review.