Civil Law and Fiduciary Duties in Private Relationships in Europe

1. Introduction

Fiduciary duties in private relationships concern situations in which one person is required to act with particular loyalty, honesty, care, or good faith toward another because of a relationship of trust, confidence, dependence, representation, or responsibility.

The concept is especially developed in English common law, where courts recognise fiduciary relationships and fiduciary duties as a distinct body of equitable law. In continental European civil-law systems, there is generally no single, universally applicable category called "fiduciary duty." Similar obligations are instead derived from concepts such as:

• good faith;
• loyalty;
• mandate;
• agency;
• trusteeship or fiduciary arrangements;
• conflicts of interest;
• abuse of rights;
• contractual cooperation;
• duties of disclosure;
• professional obligations; and
• special statutory duties.

Therefore, European fiduciary law is best understood as a comparative field rather than a uniform European doctrine.

2. Meaning of a Fiduciary Relationship

A fiduciary relationship generally exists where:

Person A is entrusted with power, property, discretion, or responsibility affecting the interests of Person B, and B is entitled to expect A to exercise that position loyally rather than for A's unauthorised personal benefit.

Examples can include:

• trustee and beneficiary;
• agent and principal;
• solicitor and client;
• director and company;
• partner and partnership;
• executor and beneficiary;
• investment manager and client;
• guardian and protected person;
• certain professional relationships; and
• certain confidential or dependent relationships.

However, not every relationship involving trust is legally fiduciary.

3. Fiduciary Duties versus Ordinary Contractual Duties

This distinction is fundamental.

Ordinary contractual duty

A contractual party must perform what the contract requires.

Fiduciary duty

A fiduciary may be required to subordinate personal interests to the interests of the person to whom the fiduciary obligation is owed.

For example:

A normal seller may negotiate for the highest price.
An agent selling property for a principal may be prohibited from secretly acquiring the property for personal benefit.

The second relationship contains a stronger loyalty obligation.

4. Fiduciary Duties in Continental Europe

Continental civil-law jurisdictions usually approach these issues through existing legal categories rather than treating "fiduciary law" as one autonomous doctrine.

Important concepts include:

A. Good faith

Parties must exercise contractual rights consistently with good faith.

B. Loyalty

An agent, mandatary, director, partner or other entrusted person may owe duties of loyalty.

C. Mandate

The mandatary acts on behalf of another and must generally follow the principal's instructions and protect the principal's interests.

D. Conflict of interest

A person entrusted with another's affairs may be prohibited from placing personal interests against those of the principal.

E. Abuse of rights

A formally available legal power cannot necessarily be exercised abusively.

F. Restitution

Unauthorised benefits obtained through a fiduciary position may have to be returned.

5. Core Fiduciary Duties

Although terminology differs among European legal systems, the following duties commonly appear.

5.1 Duty of Loyalty

The fiduciary must act loyally toward the protected person's interests.

This may require avoiding:

• self-dealing;
• secret profits;
• competing interests;
• misuse of confidential information; and
• exploitation of the entrusted position.

6. No-Conflict Rule

A fiduciary may be prohibited from placing themselves in a position where:

personal interests conflict, or potentially conflict, with duties owed to another person.

For example, an agent cannot ordinarily use the principal's confidential information to purchase the principal's property for the agent's own advantage.

7. No-Secret-Profit Rule

A fiduciary generally cannot make an unauthorised profit from the fiduciary position.

Examples include:

• secret commissions;
• undisclosed referral fees;
• hidden resale profits;
• unauthorised investment gains; and
• benefits received because of the fiduciary office.

Disclosure and informed consent can sometimes alter the legal position.

8. Duty of Disclosure

A fiduciary may have to disclose material facts.

Disclosure can be particularly important where:

• the fiduciary has a personal interest;
• the fiduciary receives a commission;
• the fiduciary is entering a related-party transaction;
• confidential information creates an opportunity; or
• the fiduciary proposes to obtain a personal benefit.

9. Duty of Care

Some fiduciary relationships also contain duties concerning competent administration.

Examples include:

• investment management;
• management of another person's property;
• administration of an estate;
• professional services; and
• company management.

However, duty of care and fiduciary duty are conceptually distinct. A person can breach a duty of care without necessarily committing a fiduciary breach.

10. Confidentiality

Confidential information obtained because of a relationship may have to be protected.

Examples include:

• client information;
• business plans;
• investment information;
• personal information;
• trade secrets; and
• negotiation strategies.

Misuse of such information can create contractual, tortious, equitable, or statutory liability depending upon the jurisdiction.

11. Fiduciary Duties in Agency

Agency is one of the clearest examples of a relationship involving fiduciary-type obligations.

The agent may be required to:

• follow instructions;
• account for money received;
• avoid conflicts;
• disclose relevant information;
• protect the principal's interests; and
• avoid unauthorised profits.

Continental European mandate law frequently performs functions that English law describes through fiduciary doctrine.

12. Fiduciary Duties in Partnerships

Partners may owe loyalty obligations to:

• the partnership;
• fellow partners; and
• sometimes partnership creditors in specific circumstances.

Problems can arise where a partner:

• diverts a business opportunity;
• competes with the partnership;
• secretly receives commissions;
• uses partnership property;
• misappropriates customers; or
• uses confidential information.

13. Directors and Companies

Directors occupy a particularly important position.

Their responsibilities can include:

• loyalty;
• avoiding conflicts;
• protecting corporate assets;
• acting within authority;
• confidentiality;
• disclosure of interests; and
• acting in the company's interests.

European company laws differ significantly, so the exact source of these obligations depends on national legislation.

14. Lawyers and Other Professionals

Professional relationships may create strong duties of:

• confidentiality;
• loyalty;
• independence;
• conflict avoidance;
• competence; and
• protection of client interests.

A lawyer's obligations can arise from:

• contract;
• professional regulation;
• civil liability;
• procedural law; and
• ethical rules.

15. Fiduciary Duties and Family Relationships

Family relationships can sometimes involve trust and dependency, but family status alone does not automatically create a fiduciary relationship.

Special obligations may arise where one family member manages:

• another person's property;
• an elderly person's assets;
• a child's property;
• an estate; or
• a family business.

Courts generally examine the actual legal relationship rather than assuming fiduciary status merely because the parties are relatives.

16. Fiduciary Duties and Private Investment

Investment relationships can involve fiduciary or fiduciary-like duties where one party exercises discretionary control over another's assets.

Issues may include:

• unsuitable investments;
• undisclosed commissions;
• self-dealing;
• conflicts;
• misrepresentation;
• unauthorised transactions; and
• failure to account.

The precise standard depends on whether the relationship is one of investment management, agency, advisory services, brokerage, or ordinary contractual dealing.

17. Fiduciary Duties and Good Faith

The concepts overlap but are not identical.

Good faith

Generally concerns honest and proper exercise of contractual rights and obligations.

Fiduciary loyalty

Can impose more demanding restrictions on conflicts and personal benefits.

Thus:

Every fiduciary relationship commonly involves loyalty, but not every contractual relationship involving good faith is fiduciary.

This distinction is particularly important when comparing continental European civil law with English equity.

18. European Case Law

Because Europe does not have one unified fiduciary-law system, the following cases illustrate different approaches, particularly the strong English fiduciary doctrine and European human-rights/private-law context.

Case 1: Bristol and West Building Society v Mothew (1998)

Facts

The case involved a solicitor who acted in connection with a mortgage transaction and was alleged to have breached fiduciary obligations.

Principle

The English Court of Appeal provided an influential explanation of fiduciary obligations.

The court distinguished:

• fiduciary duties;
• duties of care; and
• general contractual obligations.

Importance

The case is frequently used for the proposition that the central fiduciary obligation is loyalty, rather than simply a general requirement to act competently.

It is particularly useful in comparative European analysis because it demonstrates how English law conceptualises fiduciary obligations differently from many continental systems.

19. Case 2: Boardman v Phipps (1967)

Facts

A fiduciary obtained a personal benefit from an opportunity connected with the fiduciary position.

Decision

The House of Lords applied the strict no-profit principle.

Importance

The case demonstrates that a fiduciary can be required to account for profits even where:

• the transaction was beneficial;
• the fiduciary acted honestly; and
• no conventional fraud occurred.

This illustrates the strict nature of traditional fiduciary law.

20. Case 3: Keech v Sandford (1726)

Facts

A trustee attempted to obtain a lease connected with trust property after the trust beneficiary could not obtain renewal.

Decision

The trustee was prevented from personally taking the opportunity.

Importance

The case established the strict no-conflict/no-profit approach that became foundational to English fiduciary law.

It remains important when analysing:

• trustees;
• business opportunities;
• self-dealing; and
• conflicts of interest.

21. Case 4: FHR European Ventures LLP v Cedar Capital Partners LLC (2014)

Facts

An agent received a substantial secret commission in connection with a transaction.

Decision

The UK Supreme Court held that a bribe or secret commission received by an agent could be subject to a proprietary remedy for the principal.

Importance

The case significantly strengthened the protection available against:

• secret commissions;
• undisclosed benefits; and
• conflicts of interest.

It is one of the most important modern cases concerning fiduciary profits.

22. Case 5: Regal (Hastings) Ltd v Gulliver (1942)

Facts

Company directors obtained profits from an opportunity connected with their corporate position.

Decision

The directors were required to account for their profits.

Importance

The case illustrates the strict application of the corporate fiduciary no-profit principle.

The central lesson is:

A fiduciary may be required to account for a benefit obtained because of the fiduciary position even when the fiduciary acted honestly.

23. Case 6: Murad v Al-Saraj (2005)

Facts

The case concerned a business venture and undisclosed benefits obtained by a fiduciary.

Decision

The English Court of Appeal applied fiduciary principles concerning unauthorised profits and the consequences of conflicts.

Importance

The case illustrates that fiduciary remedies can be substantial and are not necessarily limited to ordinary contractual damages.

24. Case 7: Pilmer v Duke Group Ltd (2001)

Although an Australian case rather than a European judgment, it is useful in comparative fiduciary analysis because it demonstrates the distinction between:

• fiduciary loyalty;
• professional negligence; and
• ordinary contractual obligations.

For a specifically European case-law list, the preceding English cases should be prioritised.

25. European Human-Rights Dimension

Fiduciary disputes can also intersect with the European Convention on Human Rights.

Relevant provisions may include:

Article 6

Right to a fair hearing.

This can become relevant when fiduciary liability is litigated in court.

Article 8

Protection of private and family life may become relevant to confidential professional relationships.

Article 1 of Protocol No. 1

Property protection may become relevant where courts order:

• restitution;
• disgorgement;
• account of profits; or
• forfeiture of property.

26. Continental European Approach

France

French law generally approaches fiduciary-type obligations through:

• mandat;
• contractual good faith;
• loyalty;
• conflict rules;
• agency;
• corporate law; and
• fiduciary arrangements recognised by legislation.

French law does not simply reproduce the English equitable concept of a universal fiduciary relationship.

Germany

German law relies heavily on:

• Treu und Glauben (good faith);
• contractual loyalty;
• Auftrag;
• Geschäftsbesorgung;
• agency;
• corporate duties; and
• the doctrine of Treuepflicht.

The German concept of Treuepflicht can perform functions comparable to fiduciary loyalty in certain relationships.

Italy

Italian private law uses concepts including:

• buona fede;
• mandato;
• agency;
• loyalty;
• conflict-of-interest rules; and
• corporate duties.

Again, these obligations arise from specific legal relationships rather than from one universal fiduciary category.

Spain

Spanish law similarly uses:

• buena fe;
• mandato;
• agency;
• contractual loyalty;
• conflict-of-interest rules; and
• corporate fiduciary obligations.

27. England Compared with Continental Europe

28. Fiduciary Breach

A breach can occur when a fiduciary:

1. secretly profits;
2. acts for personal benefit;
3. fails to disclose a conflict;
4. misuses confidential information;
5. diverts an opportunity;
6. misappropriates property;
7. acts outside authority;
8. represents competing interests without consent;
9. fails to account; or
10. improperly uses entrusted powers.

29. Consent as a Defence

Fiduciary rules do not necessarily prohibit every transaction involving a fiduciary's personal interest.

A properly informed principal may sometimes provide:

• consent;
• authorisation;
• ratification; or
• contractual permission.

However, the validity of consent depends on:

• adequate disclosure;
• capacity;
• absence of undue influence;
• applicable mandatory rules; and
• the precise relationship.

30. Remedies for Fiduciary Breach

Potential remedies include:

1. Account of profits

The fiduciary may have to surrender unauthorised profits.

2. Restitution

Property or benefits may have to be returned.

3. Damages

Compensation may be available for loss caused by the breach.

4. Rescission

A transaction may sometimes be set aside.

5. Constructive trust

In appropriate common-law cases, property may be held on constructive trust.

6. Injunction

The court may prevent continuing misuse of the fiduciary position.

7. Disgorgement

The fiduciary may be required to surrender benefits obtained through the breach.

31. Causation and Fiduciary Remedies

An important feature of fiduciary law is that some remedies do not operate exactly like ordinary damages.

For example:

A fiduciary may have to surrender an unauthorised profit even where the principal cannot prove an equivalent financial loss.

This is particularly clear in strict English fiduciary cases such as Boardman v Phipps and FHR European Ventures v Cedar Capital Partners.

Continental systems may reach similar economic results through different doctrines, including restitution, unjust enrichment, agency law, or specific statutory rules.

32. Confidentiality and Fiduciary Relationships

Confidentiality can be particularly important in:

• lawyer-client relationships;
• investment management;
• company management;
• agency;
• family businesses;
• partnerships; and
• estate administration.

A fiduciary's misuse of information may result in:

• damages;
• injunction;
• restitution;
• account of profits; or
• other statutory remedies.

33. Fiduciary Duties and Corporate Opportunities

A corporate officer may discover a business opportunity because of their position.

The question becomes:

Can the officer personally exploit the opportunity?

Traditional fiduciary law generally approaches such situations strictly.

The court may examine:

• how the opportunity was discovered;
• whether it belonged to the company;
• whether company information was used;
• whether authorisation was obtained; and
• whether a conflict existed.

Regal (Hastings) v Gulliver remains an important illustration.

34. Fiduciary Duties in Family Businesses

Family businesses create particularly complex relationships.

For example, a family member may simultaneously be:

• shareholder;
• director;
• manager;
• trustee;
• beneficiary; and
• relative.

The existence of a family relationship does not eliminate formal fiduciary duties.

A director managing family-company assets must still comply with the applicable company-law and civil-law rules.

35. Private Wealth Management

Family offices, wealth managers and trustees may exercise significant control over private assets.

Potential disputes concern:

• undisclosed commissions;
• investment conflicts;
• related-party transactions;
• excessive fees;
• unauthorised investments;
• confidential information; and
• misuse of client assets.

The applicable legal characterisation may be contractual, fiduciary, agency-based, professional, regulatory, or a combination.

36. Digital and Modern Fiduciary Relationships

Modern private relationships increasingly involve:

• digital asset managers;
• online investment platforms;
• algorithmic wealth management;
• cryptocurrency custodians;
• digital trustees;
• AI investment advisers; and
• automated portfolio managers.

The fundamental questions remain:

1. Who controls the asset?
2. For whose benefit is it controlled?
3. What authority was granted?
4. Was there a conflict?
5. Was information disclosed?
6. Was the asset or opportunity misused?

European legislation concerning financial services, data protection and digital assets can supplement traditional civil-law principles.

37. Burden of Proof

The burden of proof varies according to the legal system and claim.

Evidence may include:

• contracts;
• mandates;
• company records;
• bank statements;
• correspondence;
• accounting records;
• board minutes;
• emails;
• investment records;
• conflict disclosures; and
• expert evidence.

Once a fiduciary relationship and suspicious transaction are established, particular legal systems may impose additional evidential obligations concerning disclosure or accounting.

38. Limitation Periods

Claims involving fiduciary obligations can be subject to limitation periods.

The applicable period may depend upon:

• the jurisdiction;
• type of claim;
• contractual basis;
• tort/delict basis;
• restitutionary claim;
• fraud;
• concealment; and
• whether the fiduciary relationship remains ongoing.

Therefore, limitation must always be analysed under the applicable national law.

39. Important Distinction: Trust Does Not Automatically Mean Fiduciary Duty

A person may trust another person without creating a fiduciary relationship.

For example:

A customer may trust a shopkeeper, but that does not normally make the shopkeeper a fiduciary.

Courts generally examine whether the defendant actually exercised:

• discretionary power;
• authority;
• control over property;
• representation; or
• a legally recognised position of responsibility.

40. Examination-Oriented Principles

Principle 1

Fiduciary duty is primarily a duty of loyalty.

Principle 2

Conflict of interest is a central fiduciary problem.

Principle 3

Secret profits are generally prohibited in fiduciary relationships.

Principle 4

Consent may permit a conflicted transaction when legally valid and adequately informed.

Principle 5

Civil-law countries frequently achieve fiduciary-type protection through good faith, mandate, agency, loyalty and statutory duties rather than one general fiduciary doctrine.

Principle 6

The existence and content of fiduciary obligations depend heavily on the particular relationship.

41. Key Case-Law Revision Table

42. Conclusion

Civil law and fiduciary duties in private relationships in Europe cannot be understood through one uniform European rule. The major distinction is between the English/common-law fiduciary doctrine, where loyalty, conflicts and unauthorised profits form a highly developed body of law, and continental civil-law systems, where comparable obligations generally arise through:

• good faith;
• loyalty;
• mandate;
• agency;
• corporate law;
• professional obligations;
• conflict-of-interest rules;
• restitution; and
• abuse-of-rights doctrines.

The central concern is nevertheless similar:

A person who receives legally significant power or control over another person's interests should not improperly exploit that position for personal advantage.

The leading cases Keech v Sandford, Boardman v Phipps, Regal (Hastings) v Gulliver, Bristol and West v Mothew, Murad v Al-Saraj, and FHR European Ventures v Cedar Capital Partners demonstrate the development of the strict English approach, while continental European systems generally address comparable problems through their own civil-law institutions.