Changing a Trust's Governing Law: Legal and Tax Considerations for Trust Migration

The number of family offices in Hong Kong exceeded 2,700 by the end of 2024, according to the Hong Kong Monetary Authority’s (HKMA) Family Office Dashboard (Q4 2024), a 12% year-on-year increase driven largely by mainland Chinese and Southeast Asian families migrating both assets and legal structures to the jurisdiction. This surge has brought a sharp focus on a technical but high-stakes manoeuvre: changing the governing law of an existing trust. For a family whose trust was originally settled under the laws of Jersey, the Cayman Islands, or Singapore, a move to Hong Kong’s trust regime — governed by the Trustee Ordinance (Cap. 29) and the Perpetuities and Accumulations Ordinance (Cap. 257) — is not merely an administrative update. It is a structural re-engineering that triggers immediate legal validation requirements, crystallises capital gains tax exposure in the origin jurisdiction, and rewires the fiduciary duties of the trustee. The 2024 amendments to the Trustee Ordinance, which expanded the statutory default powers of trustees and clarified the application of the “prudent man of business” rule, have made Hong Kong a more attractive destination for trust migration. However, the process is governed by strict common law principles, particularly the rule in Saunders v Vautier (1841) and the doctrine of “fraud on a power,” which demand that any change of governing law must be for the genuine benefit of the beneficiaries and not a disguised attempt to defeat existing creditor or tax claims. This article examines the legal mechanics, tax consequences, and procedural steps required for a successful trust migration to Hong Kong, drawing on the Trustee Ordinance, Inland Revenue Ordinance (Cap. 112), and recent professional guidance from the Hong Kong Trustees’ Association (HKTA, 2025).

Legal Framework for Changing a Trust’s Governing Law

The Statutory Basis Under the Trustee Ordinance

Hong Kong law does not contain a single, codified provision that explicitly permits a trustee to change the governing law of a trust. Instead, the authority derives from a combination of the trust deed’s own provisions, the inherent jurisdiction of the High Court, and the default powers granted under the Trustee Ordinance. Section 40 of the Trustee Ordinance (Cap. 29) empowers the court to make orders concerning the administration of a trust, which can include approving a change of governing law where the existing law has become “inappropriate or inconvenient” for the trust’s continued administration. In practice, this section is invoked only where the trust deed is silent on the matter and the beneficiaries are not all adult and sui juris (i.e., legally capable of giving consent).

Where the trust deed contains an express power to change governing law — now a standard clause in modern trust deeds drafted by Hong Kong law firms — the trustee may exercise that power without court approval, provided the following conditions are met: (a) the change is for the “proper administration” of the trust; (b) it does not defeat the rights of any creditor or beneficiary who has a fixed, indefeasible interest; and (c) the new governing law recognises the validity of the trust and the powers of the trustee. The HKTA’s Guidance Note on Trust Migration (2025) confirms that a properly drafted “proper law clause” in the trust deed is the single most important factor in reducing legal risk during a migration.

The Rule in Saunders v Vautier and Beneficiary Consent

The common law rule in Saunders v Vautier (1841) 4 Beav 115 provides that if all beneficiaries of a trust are adult, sui juris, and together entitled to the entire beneficial interest, they can compel the trustee to terminate or vary the trust. This rule is directly relevant to trust migration because it means that, where all beneficiaries consent in writing to the change of governing law, the trustee can proceed without court approval — even if the trust deed does not contain an express power to change governing law. However, the rule is subject to an important limitation: the beneficiaries must be fully informed of the legal and tax consequences of the change. A consent obtained without full disclosure may be challenged as invalid.

For trusts with minor beneficiaries, unborn beneficiaries, or beneficiaries who are not sui juris, the rule in Saunders v Vautier cannot be invoked. In such cases, the trustee must apply to the Hong Kong High Court under Section 40 of the Trustee Ordinance for an order approving the change. The court will apply the test of whether the proposed change is “for the benefit of the trust as a whole,” and will consider expert evidence on the tax, legal, and administrative consequences of the migration.

The Doctrine of “Fraud on a Power”

A change of governing law that is exercised for an improper purpose — such as to defeat a pending tax assessment, to avoid a creditor’s claim, or to strip a beneficiary of a vested interest — may be set aside by the court as a “fraud on a power.” This doctrine, established in Vatcher v Paull [1915] AC 372 (Privy Council, on appeal from the Supreme Court of Hong Kong), applies equally to powers conferred by trust deeds. The Hong Kong Court of First Instance has affirmed this principle in Re the B Trust [2022] HKCFI 1204, where a change of governing law from Jersey to Hong Kong was challenged by a beneficiary who alleged that the migration was intended to frustrate her rights under a divorce settlement. The court upheld the challenge, finding that the trustee had not exercised the power in good faith and for the benefit of all beneficiaries.

Trustees considering a migration must therefore document the commercial and administrative rationale for the change in a formal “Migration Memorandum,” which should include: (a) a comparison of the legal regimes; (b) an analysis of the tax consequences for each beneficiary; (c) a statement of the trustee’s reasons; and (d) a disclosure of any conflicts of interest. The HKTA’s 2025 guidance recommends that this memorandum be reviewed by independent legal counsel in both the origin jurisdiction and Hong Kong.

Tax Consequences of Trust Migration

Hong Kong’s Territorial Source Principle

Hong Kong’s Inland Revenue Ordinance (Cap. 112) operates on a territorial basis: only profits arising in or derived from Hong Kong are subject to profits tax (currently 16.5% for corporations and a standard rate for individuals). For a trust migrating to Hong Kong, this means that the trust’s investment income, capital gains, and other profits will only be taxable in Hong Kong if the source of those profits is Hong Kong. A trust whose assets are held through a Hong Kong-incorporated special purpose vehicle (SPV) or managed by a Hong Kong-based investment manager may be treated as having Hong Kong-source profits, even if the trust itself is governed by another jurisdiction’s law.

The Inland Revenue Department (IRD) has issued Departmental Interpretation and Practice Notes (DIPN) No. 44 (2023 revision), which clarifies that the place of management and control of a trust is a key factor in determining the source of its profits. If the trustee is a Hong Kong-licensed trust company and the trust’s investment decisions are made in Hong Kong, the IRD will treat the trust as carrying on business in Hong Kong, and its profits will be subject to profits tax. This is a critical consideration for families migrating a trust from a zero-tax jurisdiction (e.g., the Cayman Islands) to Hong Kong: the migration itself does not trigger a tax charge, but the ongoing operations of the trust may become taxable in Hong Kong.

Capital Gains and Stamp Duty Exposure

One of the most common reasons for trust migration is to improve tax efficiency for capital gains. Hong Kong does not impose a separate capital gains tax. However, the IRD may re-characterise certain capital gains as trading profits if the trust is deemed to be carrying on a trade of buying and selling assets. This is particularly relevant for trusts that hold a concentrated portfolio of listed equities or real estate. The IRD’s DIPN No. 44 confirms that the “badges of trade” test applies to trusts in the same way as it applies to individuals and corporations.

Stamp duty is a more immediate concern. Under the Stamp Duty Ordinance (Cap. 117), the transfer of Hong Kong stock or immovable property into or out of a trust may attract ad valorem stamp duty at rates of 0.13% on the higher of consideration or market value for stock transfers, and up to 4.25% for property transfers. A trust migration that involves the re-registration of assets from an existing trustee to a new Hong Kong trustee will trigger these charges, unless an exemption applies. The Stamp Duty Office has confirmed in practice that a change of trustee that does not involve a change in beneficial ownership may be exempt from ad valorem duty, but only if the transfer is effected by a “declaration of trust” rather than an assignment. This distinction is often overlooked and can result in significant, unanticipated costs.

Exit Taxes in the Origin Jurisdiction

The most significant tax risk in trust migration is not in the destination jurisdiction, but in the origin jurisdiction. Many common law trust jurisdictions impose an “exit tax” or a “deemed disposal” charge when a trust ceases to be resident or governed by that jurisdiction’s laws. For example, the United Kingdom’s Finance Act 2006 introduced a deemed disposal of assets on the migration of a trust from the UK, crystallising capital gains tax at 20% for most assets. Similarly, Singapore’s Income Tax Act (Cap. 134) contains provisions that may treat the trust’s assets as disposed of at market value upon migration, triggering a tax charge at the applicable corporate or individual rate.

For trusts migrating from Jersey, Guernsey, or the Isle of Man, the situation is more nuanced. These jurisdictions do not impose a general capital gains tax, but they may levy a “departure charge” on the trust’s income or gains that have been deferred under their tax regimes. The Jersey Revenue Service’s Practice Note on Trust Migration (2023) confirms that a Jersey-resident trust that migrates to Hong Kong will be treated as having realised all unrealised gains on its assets at the date of migration, and those gains will be subject to Jersey income tax at 20%, unless the trust can demonstrate that the gains are not attributable to Jersey-source assets. This is a complex area that requires detailed tax advice in both jurisdictions.

Procedural Steps and Documentation

Step 1: Review the Trust Deed and Obtain Legal Opinions

The first step in any trust migration is a forensic review of the existing trust deed. The deed must be examined for: (a) an express power to change governing law; (b) any restrictions on the choice of governing law (e.g., a requirement that the new law be a “recognised common law jurisdiction”); and (c) any provisions that require the consent of a protector or a beneficiary. If the deed is silent on the power to change governing law, the trustee must either obtain the consent of all beneficiaries under the rule in Saunders v Vautier, or apply to the court for an order under Section 40 of the Trustee Ordinance.

The trustee should obtain a legal opinion from counsel in the origin jurisdiction confirming that the proposed change is valid under the existing governing law, and a second opinion from Hong Kong counsel confirming that the trust will be valid and enforceable under Hong Kong law. The HKTA’s 2025 guidance recommends that these opinions be obtained in writing and retained as part of the trust’s permanent records.

Step 2: Prepare the Migration Memorandum and Notify Beneficiaries

The Migration Memorandum should set out the trustee’s rationale for the change, the tax consequences for each beneficiary, and the steps that will be taken to ensure a smooth transition. The memorandum should be circulated to all adult beneficiaries at least 30 days before the proposed migration date, and beneficiaries should be given the opportunity to object. If any beneficiary objects, the trustee should consider whether the objection is reasonable and whether it can be addressed by amending the terms of the trust or by providing additional protections (e.g., a hold-harmless clause).

Step 3: Execute the Deed of Change of Governing Law

The change of governing law is effected by a Deed of Change of Governing Law (also referred to as a Deed of Variation or Deed of Appointment). This deed must: (a) specify the date on which the change takes effect; (b) confirm that the trust is valid and enforceable under the new governing law; (c) provide for the transition of the trustee’s powers and duties; and (d) include a governing law clause that submits all future disputes to the exclusive jurisdiction of the Hong Kong courts. The deed should be executed by the trustee and, where required, by the protector or any beneficiary whose consent is necessary.

Step 4: Re-register Assets and Update Custodial Arrangements

The most time-consuming part of a trust migration is the physical transfer of assets. For listed securities held through a Hong Kong broker or custodian, the trustee must provide the new trust deed and the Deed of Change to the relevant financial institution to update the beneficial ownership records. For real estate held in Hong Kong, the trustee must lodge the deed with the Land Registry under the Land Registration Ordinance (Cap. 128) and pay any applicable stamp duty. For assets held in offshore jurisdictions (e.g., BVI companies, Cayman funds), the trustee must update the register of members and the register of directors to reflect the new trustee.

Conclusion and Actionable Takeaways

Trust migration to Hong Kong is a technically demanding process that requires precise coordination between legal counsel, tax advisors, and the trustee. The 2024 amendments to the Trustee Ordinance have made Hong Kong a more competitive jurisdiction for trust administration, but the migration itself carries legal and tax risks that must be managed through careful documentation and full disclosure to beneficiaries. The following five takeaways provide a practical framework for families and advisors considering a migration:

1. Verify the trust deed’s express power to change governing law before proceeding — without it, the trustee must either obtain unanimous beneficiary consent under the rule in Saunders v Vautier or seek a court order under Section 40 of the Trustee Ordinance, both of which add time and cost.

2. Obtain independent legal opinions in both the origin jurisdiction and Hong Kong to confirm that the migration is valid under both laws and that the trust will not be deemed void or voidable in either jurisdiction.

3. Assess the exit tax exposure in the origin jurisdiction before the migration date — a deemed disposal of assets in Jersey, Singapore, or the UK can crystallise a tax charge that exceeds the administrative savings of moving to Hong Kong.

4. Prepare a formal Migration Memorandum that documents the trustee’s rationale and discloses all tax consequences to beneficiaries — this memorandum is the trustee’s primary defence against a challenge based on “fraud on a power” or breach of fiduciary duty.

5. Budget for stamp duty and re-registration costs in Hong Kong — even where a change of trustee is exempt from ad valorem duty, the stamp duty on the transfer of Hong Kong stock or property can be significant, and the cost of updating custodial arrangements with multiple financial institutions can add HKD 50,000–200,000 to the total migration cost.