Banking Law and Financial Ombudsman Complaint Systems in Spain

Introduction

Spain has a structured system for resolving complaints between banking customers and financial institutions. Although the expression “financial ombudsman” is often used generally, Spain’s banking complaint framework is not based on a single conventional ombudsman with binding adjudicatory powers. Instead, it operates through a combination of the bank’s own Customer Service Department (Servicio de Atención al Cliente — SAC) or customer ombudsman, followed by the Banco de España’s Department of Conduct of Financial Institutions when the internal procedure does not resolve the dispute.

As of 2026, the Banco de España continues to receive complaints concerning institutions it supervises. Its jurisdiction focuses primarily on banking transparency, customer-protection rules, and accepted good banking practices.

The system is therefore important for consumer protection, while the ordinary courts remain responsible for legally binding determinations on matters such as unfair contractual terms.

Legal and Regulatory Framework

Several Spanish and European rules form the foundation of the complaint system.

Important legislation includes Law 44/2002 of 22 November on Measures to Reform the Financial System, particularly Articles 29 and 30; Order ECO/734/2004 of 11 March, governing customer-service departments and customer ombudsmen of financial institutions; Order ECC/2502/2012 of 16 November, governing complaints before the Banco de España, CNMV and DGSFP; and Law 7/2017 of 2 November, implementing Directive 2013/11/EU on alternative dispute resolution for consumer disputes. Payment-services complaints are additionally influenced by the payment-services framework.

These provisions create a two-stage system: internal consideration by the financial institution followed, where appropriate, by an external complaint before the competent financial supervisor.

Stage One: Complaint to the Bank

A customer generally cannot immediately take an ordinary banking complaint to the Banco de España. The complaint must first be submitted to the institution's SAC or customer ombudsman.

The internal complaint mechanism gives the institution an opportunity to investigate the facts and correct the problem without external intervention.

Current Banco de España guidance states that institutions generally have:

15 working days for complaints concerning payment services, such as cards, transfers and direct debits;

one month where the complainant is a consumer; and

two months for a non-consumer complaint.

If the institution rejects the complaint, accepts it only partially, refuses to process it, or fails to respond within the applicable period, the customer may proceed to the Banco de España.

Stage Two: Complaint to the Banco de España

The Banco de España can consider complaints alleging that a supervised financial institution has harmed the customer's rights or interests through breaches of banking-transparency or customer-protection requirements or through conduct inconsistent with good banking practices.

Complaints may generally be submitted electronically, in person or by post.

After commencement of the proceedings, the financial institution receives the complaint and may submit its allegations. The customer is subsequently given an opportunity to respond. Once the file is complete, the Banco de España generally issues its report within 90 days.

Legal Effect of the Banco de España's Decision

One of the most important features of the Spanish system is that the Banco de España's complaint report is not binding on either party.

The report may support the customer or the financial institution, but it is not equivalent to a judicial judgment. The Banco de España records whether the institution accepts the criterion contained in its report. Once the report has been issued, there is no appeal within this particular complaint procedure.

Consequently, a customer who requires an enforceable order—particularly concerning repayment, damages, contractual invalidity or an unfair term—may ultimately need judicial proceedings or another legally applicable dispute-resolution mechanism.

Scope and Limitations

The Banco de España's jurisdiction is particularly concerned with:

Banking transparency: whether required contractual and financial information was properly provided.

Customer protection: whether banking-specific customer-protection requirements were followed.

Good banking practices: whether the institution behaved responsibly, diligently and respectfully toward the customer, including standards that may extend beyond expressly codified obligations.

However, the Banco de España does not replace the courts. For example, it states that courts are responsible for determining whether contractual provisions such as mortgage floor clauses, mortgage-cost provisions or opening-fee provisions are legally unfair, and for determining the consequences of eliminating such provisions.

Importance in Practice

The complaint mechanism handles a substantial volume of banking disputes. According to the Banco de España's 2025 Complaints Report, published in July 2026, 30,970 complaints were received, with 10,856 admitted. Credit institutions paid approximately €6.8 million to customers as a result of these procedures.

These figures demonstrate that a non-binding complaint mechanism can still have significant practical consequences.

Relevant Case Laws

The following cases are especially useful for understanding the broader consumer-protection principles surrounding banking complaints in Spain. They should not be confused with “ombudsman decisions”: several concern judicial enforcement after or instead of non-judicial dispute resolution.

1. Banco Español de Crédito SA v Joaquín Calderón Camino — C-618/10

The Court of Justice of the European Union examined Spanish consumer proceedings involving an allegedly unfair contractual term.

The Court emphasized the protective purpose of EU consumer law and the responsibility of national courts to examine unfair terms where the necessary legal and factual material is available.

Importance: Financial complaint mechanisms supplement rather than replace judicial protection against unfair banking terms.

2. Aziz v Caixa d'Estalvis de Catalunya, Tarragona i Manresa — C-415/11

This landmark CJEU case concerned Spanish mortgage-enforcement proceedings and unfair contractual terms.

The Court concluded that Spanish procedural arrangements could not make the protection provided by Directive 93/13/EEC ineffective or excessively difficult.

Importance: Effective consumer remedies are a fundamental part of banking consumer protection. An administrative complaint mechanism cannot deprive customers of effective judicial protection.

3. Gutiérrez Naranjo and Others — Joined Cases C-154/15, C-307/15 and C-308/15

These proceedings concerned Spanish mortgage floor clauses and the financial consequences of finding those clauses unfair.

The CJEU held that EU law prevented a national judicial rule from generally limiting the restitutionary consequences associated with a finding that an unfair term was void.

Importance: Ombudsman or supervisory complaint procedures can examine banking conduct, but questions concerning invalid contractual provisions and legally enforceable restitution ultimately involve judicial authority.

4. Banco Santander SA v Demba and Bonet — Joined Cases C-96/16 and C-94/17

These cases dealt with default-interest clauses in Spanish consumer credit agreements.

The CJEU considered whether Spanish judicial principles for assessing potentially unfair default-interest terms were compatible with EU consumer law.

Importance: Banks' complaint departments must operate against the background of extensive EU and Spanish jurisprudence concerning transparency and unfair contractual terms.

5. Gómez del Moral Guasch v Bankia SA — C-125/18

This case concerned a Spanish mortgage agreement using the IRPH reference index.

The CJEU considered transparency requirements applicable to the contractual term and the information necessary for consumers to understand its economic consequences.

Importance: Transparency is also central to the Banco de España complaint framework. A financial institution should provide information enabling customers to understand material characteristics of banking products, although only a court can conclusively determine the legal unfairness of a contractual term.

6. Caixabank SA and Banco Bilbao Vizcaya Argentaria SA — Joined Cases C-224/19 and C-259/19

These proceedings addressed various terms in Spanish mortgage agreements, including costs associated with the establishment and cancellation of mortgages and certain contractual charges.

The CJEU clarified important aspects of the consequences arising from unfair terms under Directive 93/13.

Importance: The cases demonstrate why customers may use both non-judicial complaint channels and courts. Administrative complaint mechanisms can address banking practices, whereas courts can provide binding remedies concerning unfair contractual terms.

7. Caixabank and Others — C-450/22

This litigation concerned a collective action relating to mortgage floor clauses and the transparency assessment applicable to those clauses.

The CJEU's reasoning was subsequently applied by the Spanish Supreme Court. In June 2025, the Supreme Court dismissed appeals by financial institutions in ADICAE's collective litigation and confirmed the lack of transparency of the relevant floor clauses.

Importance: Collective judicial enforcement complements individual complaint mechanisms and provides another route for protecting banking customers where widespread contractual practices are challenged.

Good Banking Practices

An important feature of the Spanish complaint framework is the concept of good banking practices and usages.

The Banco de España explains that good practices may concern conduct that is not expressly imposed by legislation but can reasonably be expected from an institution carrying on financial business responsibly, diligently and respectfully toward customers.

This allows the complaint mechanism to evaluate more than straightforward statutory violations.

The Banco de España also publishes a Compendium of Best Banking Practice Criteria, which consolidates principles developed through complaints and explains how recurring conflicts between banks and customers are addressed. The current publication available in 2026 incorporates criteria updated through April 2026.

Relationship with Other Financial Complaint Authorities

Jurisdiction depends on the financial product involved.

The Banco de España generally deals with banking services and institutions within its supervisory remit. Matters involving securities and investment services generally fall within the sphere of the CNMV, while insurance and pension matters fall within the relevant insurance and pension supervisory framework.

The Banco de España may therefore decline a complaint when another authority has jurisdiction.

This division prevents the banking complaints procedure from becoming a universal financial-dispute tribunal.

Consumer Protection and Access to Courts

The ombudsman-style complaint process and judicial proceedings perform different functions.

The administrative system provides a comparatively accessible way of obtaining an independent assessment of whether a bank complied with transparency rules and good banking practices. Courts, however, possess powers that the Banco de España complaint service does not, particularly concerning binding declarations of contractual invalidity, unfair terms, restitution and enforceable remedies.

This distinction is especially important after the extensive Spanish and EU litigation concerning mortgage floor clauses, mortgage expenses, default interest and transparency.

Conclusion

Spain's financial ombudsman-style banking complaint system operates primarily through internal bank complaint mechanisms followed by the Banco de España's external complaints procedure.

Banks must maintain appropriate customer-service arrangements, while dissatisfied customers may escalate qualifying disputes to the Banco de España after completing the institution's internal procedure. The Banco de España examines compliance with transparency and customer-protection rules and with accepted good banking practices. Its resulting report, however, is non-binding, meaning judicial proceedings remain important when an enforceable remedy is required.

Cases including Banco Español de Crédito, Aziz, Gutiérrez Naranjo, Banco Santander v Demba, Gómez del Moral Guasch, Caixabank (C-224/19 and C-259/19), and Caixabank (C-450/22) demonstrate how the complaint framework exists alongside a powerful body of Spanish and EU consumer-banking jurisprudence. Together, administrative complaint handling, good-practice supervision and judicial review form the broader framework for protecting banking customers in Spain.