Banking Law and Financial Misconduct Whistleblowing Systems in Spain

Introduction

Whistleblowing systems are an important part of banking compliance in Spain. Employees, directors, contractors and other persons working with financial institutions may discover misconduct such as accounting manipulation, market abuse, corruption, fraud, money laundering, breaches of customer-protection rules or failures of internal controls.

Spanish law requires many organizations to maintain secure internal reporting systems through which such information can be communicated. The principal modern framework is Law 2/2023 of 20 February, which protects persons who report regulatory infringements and corruption. It implemented the EU Whistleblower Directive into Spanish law and establishes rules concerning internal information systems, external reporting, confidentiality, anonymous reporting and protection against retaliation.

For banks, the general whistleblowing framework operates together with financial-sector legislation, AML rules, employment law, data-protection requirements and supervisory rules administered by bodies such as Banco de España and the CNMV.

Legal and Regulatory Framework

Law 2/2023

Law 2/2023 represents the central Spanish legislation governing whistleblower protection. Its protection extends broadly to persons connected professionally or occupationally with organizations, including current and former workers, trainees, volunteers and persons involved in recruitment processes. Certain persons assisting the informant and persons or companies closely connected with them may also receive protection.

The law regulates an Internal Information System, which consists not merely of an electronic reporting channel but also of organizational responsibility and procedures for receiving, investigating and responding to reports.

The system must provide appropriate:

confidentiality;

accessibility;

investigation and follow-up procedures;

protection of informants;

organizational independence; and

designation of a person responsible for operating the system.

Spanish law also permits anonymous communications.

These requirements are particularly significant for banks because misconduct can involve complex transactions and senior personnel who might otherwise exercise influence over ordinary reporting structures.

Internal and External Reporting

Law 2/2023 generally encourages effective internal reporting because organizations may be able to identify and stop misconduct quickly. However, an employee is not absolutely required to rely upon the institution's internal hierarchy in every situation.

The legal framework recognizes internal and external channels. This is important where an employee reasonably fears retaliation, where senior management may be implicated, or where an internal investigation might otherwise be compromised.

Within securities regulation, the Law 6/2023 on Securities Markets and Investment Services provides additional protection for persons communicating infringements. Article 277 provides, among other things, that qualifying communications do not constitute certain breaches of disclosure restrictions and must not produce unfair or discriminatory employment treatment. The CNMV must also provide information concerning available remedies and procedures for protection against possible harm.

Confidentiality and Anonymous Reporting

Confidentiality is fundamental to an effective banking whistleblowing mechanism.

Banks may possess highly sensitive information concerning customers, employees and commercial operations. A reporting system must therefore balance several interests:

First, the whistleblower's identity requires protection.

Second, personal information relating to persons mentioned in a complaint must be processed lawfully.

Third, the person accused of wrongdoing retains procedural and defence rights.

Fourth, information potentially relevant to criminal, administrative or regulatory proceedings must be appropriately preserved.

Law 2/2023 expressly accommodates anonymous communications, providing an additional mechanism for persons who might otherwise hesitate to report misconduct.

Protection Against Retaliation

Whistleblowing systems cannot operate effectively if employees reasonably expect that reporting misconduct will automatically cost them their employment or professional opportunities.

The Spanish framework therefore protects qualifying informants against retaliation. In the financial-services context, retaliation could potentially appear through dismissal, demotion, discriminatory treatment, denial of professional opportunities or other employment disadvantages.

Protection is nevertheless linked to the statutory conditions. Whistleblower legislation should not be understood as granting unrestricted immunity for knowingly false allegations or unrelated misconduct.

Banking Compliance and Corporate Responsibility

Whistleblowing also interacts with corporate compliance.

A bank's internal controls should allow suspicious conduct to reach compliance personnel who possess sufficient independence to investigate it. Reports involving senior executives require particular safeguards because ordinary managerial reporting lines may create conflicts of interest.

The importance of genuinely effective controls is illustrated by the ongoing BBVA/Tándem proceedings. In February 2026, Spain's Audiencia Nacional confirmed the existence of sufficient indications for former BBVA executives and others to proceed toward trial concerning alleged unlawful engagements. Importantly for compliance systems, the court stated at the procedural stage that there were indications that the bank's prevention and control model was ineffective because certain senior persons could allegedly operate outside the control framework. These remain allegations to be adjudicated rather than final findings of criminal guilt.

This demonstrates why a whistleblowing channel should not merely exist formally. It must operate independently enough to receive concerns involving powerful individuals within an institution.

Relevant Case Laws

Direct Spanish judgments interpreting every provision of the relatively recent Law 2/2023 remain developing. Consequently, banking whistleblowing law should also be understood through cases concerning reporting evidence, financial misconduct, corporate controls and banking compliance.

1. Falciani List Case – Spanish Supreme Court, 2017

The Spanish Supreme Court considered information originally obtained by former HSBC employee Hervé Falciani and subsequently transmitted to Spanish authorities through French authorities.

The Court accepted information from the so-called Falciani List as valid evidence in Spanish tax-crime proceedings and upheld the relevant conviction.

Legal significance: The judgment is important to the wider relationship between insider-supplied banking information, evidence and enforcement. It does not mean that every unauthorized disclosure by an employee is automatically lawful; rather, the legality and admissibility of evidence depend upon the particular circumstances and applicable law.

2. BBVA/Tándem Proceedings – Audiencia Nacional, 2026

The Audiencia Nacional rejected appeals against the decision moving proceedings involving BBVA, former executives and others toward trial concerning alleged bribery and disclosure-of-secrets offences.

The court specifically addressed alleged deficiencies in the organization's prevention and control structure.

Legal significance: Effective compliance requires mechanisms capable of scrutinizing conduct at senior-management level. A reporting system that can easily be bypassed by senior executives may provide inadequate protection against corporate misconduct.

3. ICBC Spain Money-Laundering Case – Audiencia Nacional, 2020

The Audiencia Nacional convicted four former employees of the Spanish branch of ICBC in proceedings concerning laundering money connected with criminal organizations. The proceedings also resulted in measures affecting the Spanish branch of the bank.

Legal significance: Banking personnel and internal systems form an important part of AML compliance. Internal reporting mechanisms can assist institutions in identifying suspicious practices before they develop into serious regulatory or criminal exposure.

4. Banco Popular/Santander Remuneration Disclosure Case – Supreme Court, 2023

The Spanish Supreme Court confirmed a €1 million CNMV sanction for which Santander was responsible as successor to Banco Popular. The underlying infringement concerned omitted or misleading information in Banco Popular's annual reports for 2013–2015 regarding executive-director remuneration and related arrangements.

Legal significance: Accurate internal escalation is particularly important where employees identify possible deficiencies in regulatory disclosures. Whistleblowing mechanisms can complement auditing, compliance and board-level reporting systems.

5. BBVA Unauthorized Transfer Case – Supreme Court, 2016

The Supreme Court ordered BBVA to compensate a customer after the bank processed a transfer without adequately verifying the authenticity of the customer's purported signature. The Court considered that the bank had failed to exercise the professional diligence required in managing and safeguarding the customer's account.

Legal significance: Although this was not a whistleblower-retaliation case, it demonstrates the importance of internal controls and professional diligence. Internal reporting mechanisms should allow employees to escalate weaknesses in authorization and transaction-control procedures.

6. Supreme Court Public-Funds/BBVA Cheque Case

The Supreme Court confirmed a conviction concerning a public employee who unlawfully obtained funds using bearer cheques. BBVA was held subsidiarily liable for part of the compensation because bank employees had paid cheques despite deficiencies that should have triggered necessary verification.

Legal significance: Whistleblowing and escalation systems can form part of the broader control architecture through which employees identify repeated departures from verification procedures.

7. Cantabria Bank-Branch Director Fraud Case, 2025

The Provincial Court of Cantabria sentenced a former branch director to imprisonment and a fine after finding that he had transferred €49,910 from an elderly customer's accounts without her consent. The reported judgment was not final when announced because an appeal remained available.

Legal significance: Misconduct may be committed by individuals occupying managerial positions. Banks therefore require reporting mechanisms through which subordinate employees can raise concerns without having to report exclusively through the manager implicated in the suspected wrongdoing.

How an Effective Banking Whistleblowing System Should Operate

An effective Spanish banking whistleblowing framework should combine the requirements of Law 2/2023 with financial-sector compliance arrangements.

The reporting channel should be accessible while protecting confidentiality. Responsibility for the system should be sufficiently independent, and reports should be documented and investigated objectively.

Where allegations concern senior management, the investigation process should avoid reporting structures controlled by those implicated.

Banks must also coordinate whistleblowing procedures with AML controls, fraud prevention, regulatory reporting, employment protections, cybersecurity and data protection.

Anonymous reports should not automatically be dismissed merely because the identity of the source is unknown. Law 2/2023 specifically accommodates anonymous communications.

Whistleblowing and AML Compliance

Whistleblowing is particularly significant in anti-money-laundering compliance.

Employees working in branches, transaction monitoring, compliance, onboarding and customer due diligence may be among the first persons to identify unusual behaviour.

An institution therefore benefits from having both formal AML escalation mechanisms and broader protected reporting systems. The ICBC proceedings illustrate the serious consequences that can arise when banking operations become associated with money-laundering activity.

However, an internal whistleblowing report does not necessarily replace mandatory reporting to competent authorities under sector-specific legislation.

Data Protection and Rights of Accused Persons

Whistleblower protection must coexist with data-protection and procedural safeguards.

A bank cannot treat an allegation as automatically establishing guilt. Reports require assessment and, where appropriate, investigation. Information should generally be restricted to persons who require access for legitimate investigation and compliance purposes.

The identity of an informant should receive the confidentiality protection established by law, while persons affected by allegations retain applicable legal and defence rights.

This balance is essential because whistleblowing legislation protects reporting mechanisms while maintaining fundamental principles of fairness.

Conclusion

Financial-misconduct whistleblowing systems have become an important component of Spanish banking governance.

Law 2/2023 establishes Spain's general modern framework for internal information systems, confidentiality, anonymous communications and protection against retaliation. Financial-sector legislation, including Law 6/2023, provides additional protections in areas supervised by the CNMV.

The relevant case law and enforcement proceedings—including the Falciani List case, BBVA/Tándem proceedings, ICBC Spain case, Banco Popular/Santander disclosure case, BBVA unauthorized-transfer judgment, the BBVA cheque case and the Cantabria branch-director fraud case—illustrate why banks need effective internal controls and reliable mechanisms for escalating suspected wrongdoing.

The central legal principle is that a whistleblowing system should be independent, confidential, accessible and capable of producing genuine investigation and corrective action. Merely establishing a reporting mailbox is insufficient if employees cannot safely use it or if senior personnel can circumvent the institution's compliance framework.