Principles of Trust Deed Interpretation and Ambiguous Clause Resolution

The Hong Kong Court of Final Appeal’s judgment in Lau Kwok Fai v. Chau Luen (2024) 27 HKCFAR 1 has materially altered the landscape for trust deed interpretation, introducing a stricter textualist approach that directly impacts how private trust structures—particularly VISTA and STAR trusts—will be drafted and contested going forward. This shift coincides with the HKMA’s December 2025 circular on enhanced due diligence for complex trust structures (HKMA Circular B1/15C), which explicitly requires trustees to document the “settlor’s objective intention” as expressed in the deed, not as later asserted. For HNW families using Hong Kong as a trust jurisdiction, the convergence of these two developments means that ambiguous clauses—once a source of strategic flexibility—now carry material litigation and regulatory risk. The 2025 SFC annual report noted a 34% year-on-year increase in contested trust matters involving cross-border assets (SFC, 2025), underscoring the practical urgency. This article examines the core principles of trust deed interpretation under Hong Kong law, the mechanics of resolving ambiguous clauses, and the specific implications for private trust structures, drawing on the Lau Kwok Fai decision, the Re Rabaiotti (2000) 2 ITELR 763 precedent from the Jersey courts, and Hong Kong’s Trustee Ordinance (Cap. 29).

The Textualist Turn in Hong Kong Trust Law

The Lau Kwok Fai Standard

The Court of Final Appeal in Lau Kwok Fai v. Chau Luen (2024) established that trust deeds must be interpreted according to their “plain and ordinary meaning,” with extrinsic evidence admissible only where the deed is genuinely ambiguous. This represents a departure from the earlier Tam Tak Chuen v. Khor Kar Kheng (2022) approach, which permitted broader contextual evidence. The court held that the “objective intention” of the settlor is to be derived from the deed’s language, not from subsequent conduct or unexpressed wishes—a principle that directly mirrors the HKMA’s 2025 circular requirement for trustees to document intent at execution.

For VISTA trusts structured under the Virgin Islands Special Trusts Act (Cap. 249), this standard creates a tension. VISTA trusts typically grant directors of BVI companies significant autonomy, with the trust deed often containing “office-holder” clauses that limit the trustee’s intervention rights. Under Lau Kwok Fai, if such a clause is ambiguous—for example, whether “ordinary business decisions” excludes capital restructuring—the court will interpret it strictly against the drafter, potentially exposing the trustee to liability for inaction.

The Re Rabaiotti Influence

The Jersey Royal Court’s decision in Re Rabaiotti (2000) 2 ITELR 763 remains the leading Commonwealth authority on ambiguous trust clauses, and Hong Kong courts have increasingly cited it in post-2024 decisions. The case established the “armchair principle”: the court may place itself in the settlor’s position at the time of execution, considering only facts known to the settlor, not subsequent events. Hong Kong’s Court of Appeal in Ho v. Ho (2025) 3 HKLRD 45 explicitly adopted this principle, limiting the scope of extrinsic evidence to “documents in existence at the date of the deed.”

This has direct implications for STAR trusts (Special Trusts Alternative Regime under the Trusts Law (2022 Revision) of the Cayman Islands) used by Hong Kong families. STAR trusts often include “purpose clauses” that are deliberately broad to accommodate family governance. Under Re Rabaiotti as applied in Hong Kong, a purpose clause stating “to promote family harmony” is likely void for uncertainty unless the deed specifies measurable criteria—a drafting requirement that many existing STAR trust deeds fail to meet.

The Role of the Trustee Ordinance

Section 40 of the Trustee Ordinance (Cap. 29) provides the statutory framework for trustees seeking judicial directions on ambiguous clauses. The 2024 amendment (Ord. No. 15 of 2024) expanded the trustee’s right to apply for directions without fear of costs sanctions, provided the application is made in good faith. Data from the High Court’s Trust List shows 47 such applications in 2025, up from 29 in 2023, with 62% involving cross-border structures (Hong Kong Judiciary Annual Report, 2025).

The practical effect is that trustees of Hong Kong private trusts holding BVI or Cayman assets now have a clear statutory route to resolve ambiguity before acting. However, the HKMA’s circular requires that any such application be disclosed to the relevant bank if the trust holds regulated assets, creating a compliance burden that many family offices have underestimated.

Resolving Ambiguous Clauses: The Three-Step Framework

Step One: The Four Corners Test

The first step in any ambiguity analysis is the “four corners” test, requiring the court to determine whether the clause is genuinely ambiguous on its face. The 2025 Re Lee Family Trust decision (HCMP 1234/2025) clarified that a clause is ambiguous only if it is “reasonably capable of two or more meanings” when read in the context of the entire deed. This excludes “manufactured ambiguity”—where a party argues for a strained reading to achieve a desired outcome.

For VISTA trusts, the most common source of ambiguity is the “reserved powers” clause. A typical clause might state: “The settlor reserves the power to direct the trustee in respect of investment decisions.” Under Re Lee, if the deed also contains a “no duty to monitor” clause, the interaction creates ambiguity: does the reserved power override the no-monitoring duty, or is the trustee entitled to ignore a direction that conflicts with its fiduciary duties? The court held that such a clause is ambiguous and must be resolved in favour of the trustee’s overriding fiduciary duty, absent explicit language to the contrary.

Step Two: Extrinsic Evidence

Where the four corners test reveals genuine ambiguity, the court admits extrinsic evidence under the Re Rabaiotti framework. This evidence is strictly limited to:

• The settlor’s factual matrix at the time of execution (e.g., family structure, asset composition)
• Correspondence between the settlor and the trustee during drafting
• The trust deed’s recitals and schedules

Crucially, evidence of the settlor’s later conduct or statements is inadmissible. The 2025 Ho v. Ho decision rejected a beneficiary’s attempt to introduce WhatsApp messages sent three years after the deed’s execution, stating they “reflect a change of intention, not the intention at formation.”

For STAR trusts, this rule creates a particular challenge. Many STAR trust deeds are drafted with “letter of wishes” that are intended to guide the trustee but are not legally binding. Under Ho v. Ho, a letter of wishes executed after the deed is inadmissible for interpretation purposes, meaning the trustee must rely solely on the deed’s language. This has led to a surge in “pre-execution letters of wishes” being drafted contemporaneously with the deed and annexed as schedules—a practice the HKMA’s 2025 circular explicitly endorses as “best practice.”

Step Three: The Default Rules

If extrinsic evidence fails to resolve the ambiguity, the court applies default rules derived from common law and the Trustee Ordinance. The most important default rules for private trusts are:

• The contra proferentem rule: Ambiguity is resolved against the party who drafted the clause. For most trust deeds, this is the settlor’s legal advisor, but the consequence falls on the beneficiary, who loses the benefit of the ambiguous provision.
• The fiduciary duty override: Any ambiguity that could compromise the trustee’s fiduciary duties is resolved in favour of preserving those duties. This is the holding in Re Lee Family Trust (2025).
• The purpose clause voidness rule: Under Section 103 of the Trustee Ordinance, a purpose clause that is ambiguous to the point of being unenforceable is void, and the trust fund reverts to the settlor’s estate.

The 2025 data from the Hong Kong Trusts Association shows that 23% of contested trust matters involve purpose clauses, with 41% of those resulting in the clause being declared void (HKTA Annual Survey, 2025). For families using purpose trusts for succession planning, this statistic underscores the need for precise drafting.

Practical Implications for VISTA and STAR Trusts

VISTA Trusts: The Office-Holder Clause Problem

VISTA trusts derive their utility from the ability to limit the trustee’s intervention in the management of BVI companies. The standard VISTA trust deed includes an “office-holder clause” that prohibits the trustee from interfering with the directors’ decisions unless the company is insolvent or the directors are acting in breach of duty. However, the 2024 Lau Kwok Fai decision has exposed a critical drafting gap: what constitutes “breach of duty” is itself ambiguous.

The BVI Business Companies Act (Cap. 212) imposes duties on directors to act in good faith and in the best interests of the company. But a VISTA trust deed may define “breach of duty” more narrowly—for example, excluding “business judgment errors.” Under the textualist approach, if the deed does not explicitly define “breach of duty,” the court will apply the statutory definition, which is broader than many settlors intend. The HKMA’s 2025 circular requires trustees to document their understanding of such terms, creating a disclosure risk for families who assumed the VISTA structure provided absolute insulation.

STAR Trusts: The Purpose Clause Precision Requirement

STAR trusts permit non-charitable purpose trusts, but the Cayman Islands Trusts Law (2022 Revision) requires that the purpose be “sufficiently certain” to be enforceable. The 2025 In re Star Trust No. 8 (Cayman Grand Court, unreported) held that a purpose “to maintain the family’s wealth” was void for uncertainty because it did not specify “whether the wealth is measured by net asset value, income generation, or capital preservation.”

For Hong Kong families using STAR trusts as part of a multi-jurisdictional structure, this decision has direct consequences. The trust deed must now specify:

• The precise metric for measuring the purpose (e.g., “maintain a minimum net asset value of HKD 500 million”)
• The time frame for the purpose (e.g., “for a period not exceeding 50 years”)
• The mechanism for varying the purpose if it becomes impossible

The HKMA’s 2025 circular further requires that any purpose clause be “capable of objective verification” by the trustee, effectively eliminating the “family harmony” type clauses that were common in pre-2024 STAR trust deeds.

The Cross-Border Enforcement Challenge

A recurring issue in Hong Kong private trust litigation is the enforcement of Hong Kong court orders against trust assets held in BVI or Cayman entities. The 2025 Re BVI Trust No. 7 (Eastern Caribbean Supreme Court, unreported) held that a Hong Kong court’s interpretation of a BVI trust deed is not binding on BVI courts unless the deed expressly submits to Hong Kong jurisdiction.

This creates a jurisdictional gap: a Hong Kong court may resolve an ambiguous clause in a VISTA trust deed, but the BVI court may reach a different conclusion if the same issue arises in BVI proceedings. The practical solution is to include a “governing law and jurisdiction” clause that expressly submits the trust to Hong Kong law and the exclusive jurisdiction of the Hong Kong courts. The HKMA’s 2025 circular recommends that such clauses be “conspicuously placed” in the deed, not buried in schedules.

Actionable Takeaways

1. Review all existing VISTA and STAR trust deeds by Q2 2026 to identify ambiguous clauses—particularly office-holder clauses and purpose clauses—that may be void or unenforceable under the Lau Kwok Fai (2024) textualist standard.
2. Execute contemporaneous letters of wishes as schedules to the trust deed, not as separate documents, to ensure they are admissible as extrinsic evidence under the Re Rabaiotti (2000) framework.
3. Include express governing law and exclusive jurisdiction clauses in all trust deeds governing BVI or Cayman assets, to avoid cross-border enforcement gaps identified in Re BVI Trust No. 7 (2025).
4. Define all key terms—including “breach of duty,” “ordinary business decisions,” and “family wealth”—with objective, measurable criteria, to avoid the voidness risk highlighted by the HKTA’s 2025 survey.
5. Disclose any ambiguity resolution applications to regulated banks holding trust assets, as required by the HKMA’s December 2025 circular, to avoid regulatory sanctions for non-disclosure.