Fiduciary Duty: Definition and Application in Swiss Finance

Definition

Fiduciary duty is the legal obligation of a person or institution entrusted with the management of another’s assets to act solely in the best interests of the principal, exercising the standard of care, diligence, and loyalty that the relationship demands. In Swiss financial services, fiduciary duty is a foundational principle governing the conduct of banks, asset managers, trustees, and other financial intermediaries in their relationships with clients.

Legal Basis in Switzerland

Fiduciary duty in Swiss law arises from several sources:

Contract law (Code of Obligations). The relationship between a wealth manager and client is typically governed by a mandate agreement (Auftragsrecht, Articles 394-406 CO). Under Swiss mandate law, the mandatary (the wealth manager) owes the mandator (the client) a duty of diligent and loyal performance. The mandatary must act in the client’s interest, follow the client’s instructions, and account for the management of the mandate.

Financial Services Act (FinSA). The Swiss Financial Services Act codifies specific conduct obligations that give effect to fiduciary principles, including duties of information, suitability assessment, best execution, and conflicts of interest management.

Financial Institutions Act (FinIA). The FinIA imposes governance and organisational requirements on financial institutions that support the exercise of fiduciary duties, including requirements for risk management, compliance, and internal controls.

Industry codes of conduct. Professional associations — including the Asset Management Association Switzerland (AMAS) and the Swiss Bankers Association (SBA) — publish codes of conduct that articulate fiduciary standards for their members.

Components of Fiduciary Duty

Duty of Care

The duty of care requires the fiduciary to exercise the level of skill, diligence, and prudence that a competent professional would apply in similar circumstances. In the context of portfolio management, this encompasses:

• Conducting thorough analysis before making investment decisions
• Maintaining adequate diversification appropriate to the client’s risk profile
• Monitoring portfolio positions and market conditions on an ongoing basis
• Implementing and maintaining robust operational and risk management processes

The standard of care is objective — it is measured against what a qualified professional would do, not against the subjective judgment of the individual manager. Specialist knowledge and expertise may raise the applicable standard.

Duty of Loyalty

The duty of loyalty requires the fiduciary to subordinate personal interests to those of the client. This duty prohibits:

• Self-dealing. Transactions in which the fiduciary benefits at the client’s expense
• Conflicts of interest. Situations in which the fiduciary’s interests or obligations to third parties could compromise the quality of service to the client
• Undisclosed compensation. Receipt of payments, commissions, or other benefits from third parties in connection with the management of the client’s assets without the client’s informed consent

Under FinSA, financial service providers must take organisational measures to prevent conflicts of interest from adversely affecting clients and must disclose conflicts that cannot be avoided.

Duty to Inform

The fiduciary must provide the client with the information necessary to make informed decisions about the management of their assets. This includes:

• Reporting on portfolio composition, performance, and risk
• Disclosing all costs and fees associated with the management relationship
• Informing the client of material developments affecting their investments
• Providing clear and accurate documentation of the services provided

Duty to Follow Instructions

Under Swiss mandate law, the mandatary must follow the client’s instructions, provided they are lawful and consistent with the terms of the mandate. In a discretionary mandate, the client delegates investment decisions to the manager within agreed parameters — but the manager remains bound by the investment strategy, risk profile, and any specific restrictions defined in the mandate agreement.

Practical Implications

Fiduciary duty has significant practical implications for the Swiss wealth management industry:

Investment suitability. Portfolio managers must ensure that investment decisions are suitable for the specific client, taking into account their financial situation, investment objectives, knowledge and experience, and risk tolerance. This is codified in the suitability assessment requirements of FinSA.

Fee transparency. The duty of loyalty and the duty to inform require full transparency on all fees, commissions, and inducements. Retrocessions — payments received from product providers — have been a particular area of legal and regulatory scrutiny in Switzerland, with Swiss Federal Supreme Court case law establishing that retrocessions must be disclosed to and may be claimed by the client.

Conflicts management. Financial institutions must maintain organisational structures and policies that identify, prevent, and manage conflicts of interest. This includes Chinese walls between advisory and proprietary trading functions, restrictions on personal dealing by staff, and governance of product selection processes.

Liability. Breach of fiduciary duty may give rise to civil liability for damages suffered by the client. Swiss courts have held portfolio managers and banks liable for losses resulting from inadequate diversification, failure to monitor positions, and breach of investment guidelines.

Fiduciary Duty and Discretionary Mandates

The fiduciary relationship is most fully expressed in discretionary mandates, where the client delegates comprehensive investment authority to the manager. In this context, the manager’s fiduciary obligations extend to all aspects of portfolio construction, trading, and monitoring.

The scope of fiduciary duty in discretionary mandates is defined by the mandate agreement, the agreed investment strategy, and any specific client instructions or restrictions. The manager is expected to exercise professional judgment within these parameters, applying the duty of care and loyalty to every decision affecting the client’s assets.

Comparison with Other Jurisdictions

The concept of fiduciary duty in Swiss law shares common ground with Anglo-American fiduciary principles but differs in important respects. Swiss fiduciary duty is rooted in contract law (mandate) rather than trust law, and the remedies available for breach differ from those in common-law jurisdictions. However, the substantive content — loyalty, care, prudence, and transparency — is broadly consistent across systems, reflecting universal principles of fair dealing in financial relationships.

Donovan Vanderbilt is a contributing editor at ZUG FINANCE, the Swiss private banking and fintech intelligence publication of The Vanderbilt Portfolio AG, Zurich. He covers wealth management, institutional finance, and regulatory affairs across the Swiss financial centre.