Hong Kong vs Singapore Trust Law Comparison: Tax Implications of Perpetuity Periods and Forced Heirship Rules

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The decision by the Hong Kong government in July 2024 to abolish the rule against perpetuities for trusts, effective from the enactment of the Perpetuities and Accumulations (Amendment) Ordinance 2024, has fundamentally altered the territory’s competitive position against Singapore in the private wealth management sector. This legislative change, which came into full force on 1 August 2024, removes a century-old common law constraint that limited the duration of a trust to a fixed period, typically a life in being plus 21 years. For high-net-worth families and their advisors, the choice between Hong Kong and Singapore as a trust jurisdiction now hinges on a more nuanced set of factors, particularly the interaction between perpetuity periods and forced heirship rules. This analysis examines the tax implications of these two critical legal features, drawing on primary legislation and recent regulatory developments in both jurisdictions.

The Perpetuity Period Divergence: Unlimited Duration vs. 100-Year Cap

Hong Kong’s Post-2024 Regime: No Statutory Limit

The Perpetuities and Accumulations (Amendment) Ordinance 2024 (Ord. No. 14 of 2024) repealed sections 9 to 12 of the Perpetuities and Accumulations Ordinance (Cap. 257), effectively abolishing the rule against perpetuities for trusts created on or after 1 August 2024. This means a Hong Kong trust can now exist indefinitely, with no statutory requirement to vest assets within any fixed period. For tax purposes, this creates a significant planning advantage: a family can structure a dynasty trust that holds assets across multiple generations without triggering a deemed disposal or chargeable event at the expiry of a perpetuity period.

The Inland Revenue Department (IRD) has not issued any public guidance suggesting that the abolition of the perpetuity rule will alter the territorial source principle for trust taxation. Under section 5 of the Inland Revenue Ordinance (Cap. 112), a trust is only subject to Hong Kong profits tax on income arising in or derived from Hong Kong. An unlimited-duration trust that holds offshore assets—such as a BVI holding company with operating subsidiaries in Southeast Asia—would continue to be treated as offshore for Hong Kong tax purposes, provided the trust’s central management and control are exercised outside Hong Kong. The IRD’s Departmental Interpretation and Practice Notes (DIPN) No. 44 (Revised 2023) on “Offshore Claims” remains the operative guidance, requiring trustees to demonstrate that key commercial decisions are made outside the territory.

Singapore’s Statutory 100-Year Limit

Singapore takes a different approach. The Trusts (Amendment) Act 2004 introduced section 90A of the Trustees Act (Cap. 337), which allows a settlor to specify a perpetuity period of up to 100 years for any trust created on or after 1 December 2004. This is a fixed statutory cap, not an indefinite period. For trusts created before that date, the common law rule against perpetuities continues to apply, meaning a life in being plus 21 years remains the default.

The 100-year limit is not merely a procedural constraint; it has direct tax implications. Under Singapore’s income tax regime, a trust is taxed on income accrued in or derived from Singapore, as well as foreign-sourced income remitted into Singapore. Section 13(12) of the Income Tax Act 1947 (Cap. 134) provides an exemption for foreign-sourced income received by a trust, but this exemption is subject to conditions, including that the income has been subject to tax in the source jurisdiction. If a trust’s 100-year period is approaching expiry, trustees may need to consider restructuring or distributing assets, potentially triggering a tax event in Singapore if assets are repatriated.

Practical Comparison for Dynasty Planning

For a family office structuring a multi-generational trust, the difference is material. A Hong Kong trust can hold a BVI company that owns a portfolio of US real estate and Hong Kong listed equities indefinitely. No forced distribution or vesting is required. The trust can accumulate income within the BVI company, which is not subject to Hong Kong profits tax because the company is not carrying on a trade or business in Hong Kong (section 14 of the IRO). In contrast, a Singapore trust with a 100-year cap will eventually require a distribution event, which could trigger Singapore income tax on the accumulated income if it is remitted into Singapore after the 100-year period.

However, the practical impact of the 100-year cap is often overstated for most families. Very few trusts are designed to last beyond 100 years, and the Singapore tax authority, the Inland Revenue Authority of Singapore (IRAS), has not issued any guidance suggesting that the expiry of the perpetuity period automatically triggers a deemed disposal or chargeable gain. The cap functions more as a legal constraint than an immediate tax trigger.

Forced Heirship Rules: The Common Law vs. Civil Law Divide

Hong Kong’s Common Law Position: No Forced Heirship

Hong Kong, as a common law jurisdiction, does not impose forced heirship rules on testamentary dispositions. The Probate and Administration Ordinance (Cap. 10) and the Inheritance (Provision for Family and Dependants) Ordinance (Cap. 481) provide mechanisms for family members to claim reasonable financial provision from an estate, but these are discretionary court remedies, not automatic entitlements. A settlor can place assets into a trust during their lifetime, and those assets are generally not subject to forced heirship claims under Hong Kong law.

For a US citizen or green card holder living in Hong Kong, this is particularly relevant. The US does not have forced heirship rules at the federal level, but certain states (e.g., Louisiana) do. A Hong Kong trust can effectively override a Louisiana forced heirship claim because the trust assets are held in a jurisdiction that does not recognize the civil law concept of “legitime” (the reserved portion of an estate for children). However, the US-Hong Kong Treaty on Mutual Legal Assistance in Criminal Matters (signed 1997, in force 2000) does not cover civil matters, so enforcement of a Louisiana court order in Hong Kong would require separate proceedings under the Foreign Judgments (Reciprocal Enforcement) Ordinance (Cap. 319), which only applies to judgments from jurisdictions designated by the Chief Executive. Louisiana is not a designated jurisdiction.

Singapore’s Position: Statutory Recognition of Foreign Forced Heirship

Singapore has taken a more cautious approach. Section 90B of the Trustees Act (Cap. 337) provides that a trust governed by Singapore law is not invalidated by any foreign forced heirship rule, but this protection is subject to an important caveat: the settlor must have been domiciled in Singapore at the time the trust was created. If the settlor is domiciled in a civil law jurisdiction (e.g., France, Germany, or Japan) that imposes forced heirship, the trust may still be challenged in the settlor’s home country, and Singapore courts may not automatically uphold the trust if the settlor was not Singapore-domiciled.

The Singapore Court of Appeal’s decision in Re the Trust of A [2021] SGCA 15 is instructive. The court held that a Singapore trust could be set aside if it was created to defeat the forced heirship rights of a child under French law, where the settlor was domiciled in France at the time of creation. The court applied the principle of “ordre public” (public policy) to allow the French claim, even though Singapore law itself does not recognize forced heirship. This decision has caused significant concern among family offices with civil law clients.

Tax Implications of Forced Heirship Challenges

The tax implications of a forced heirship challenge are often overlooked. If a trust is successfully challenged and assets are distributed to forced heirs, the distribution may trigger a tax event in the jurisdiction where the assets are located. For example, if a Hong Kong trust holds Hong Kong listed shares and a French court orders their distribution to a forced heir, the distribution would likely be treated as a disposal of the shares by the trust, potentially triggering Hong Kong profits tax if the trust is carrying on a trade in Hong Kong (section 14 of the IRO). The IRD has not issued any guidance on this specific scenario, but the general principle under DIPN No. 44 is that a one-off distribution of assets by a trust is not considered a trade.

For US persons, a forced heirship distribution could trigger US gift tax under IRC § 2501 if the distribution is treated as a gift from the trust to the heir. The US-Hong Kong Tax Information Exchange Agreement (TIEA), signed in 2010 and in force from 2011, allows the IRS to request information about trust distributions to US persons, but does not provide for automatic exchange. A US citizen trustee of a Hong Kong trust would need to file Form 3520 (Annual Return To Report Transactions With Foreign Trusts) if the trust distributes assets to a US beneficiary, even if the distribution is compelled by a foreign court order.

Taxation of Trust Income: A Comparative Framework

Hong Kong: Territorial Source Rule Applied to Trusts

Hong Kong’s territorial source rule applies to trusts in the same way it applies to individuals and corporations. Under section 5 of the IRO, a trust is chargeable to profits tax only on income arising in or derived from Hong Kong. The IRD’s DIPN No. 44 (Revised 2023) provides detailed guidance on how to determine the source of trust income. The key factors include:

Where the trust’s central management and control is exercised
Where the trust’s investment decisions are made
Where the trust’s assets are located

For a Hong Kong trust that holds a BVI company with a Singapore operating subsidiary, the income of the BVI company is generally not subject to Hong Kong profits tax because the company is not carrying on a trade in Hong Kong. However, if the trust distributes dividends from the BVI company to a Hong Kong resident beneficiary, the beneficiary may be subject to Hong Kong salaries tax (if the beneficiary is an employee) or profits tax (if the beneficiary is a trader) on the dividend income. The IRD’s position, as set out in DIPN No. 44, is that dividends from a foreign company are generally not subject to Hong Kong tax unless the beneficiary is carrying on a trade in Hong Kong and the dividend is derived from that trade.

Singapore: Remittance Basis for Trusts with Foreign Income

Singapore’s tax regime for trusts is more complex. Under section 13(12) of the Income Tax Act 1947 (Cap. 134), foreign-sourced income received by a trust is exempt from Singapore income tax, provided the income has been subject to tax in the source jurisdiction. This exemption applies to both income and capital gains. However, the exemption is not automatic; the trust must apply to IRAS for approval, and the approval is subject to conditions, including that the trust is not carrying on a trade in Singapore.

For a Singapore trust that holds a BVI company, the BVI company’s income is foreign-sourced and generally exempt from Singapore tax. But if the BVI company distributes dividends to the trust, and the trust then distributes those dividends to a Singapore resident beneficiary, the beneficiary may be subject to Singapore income tax on the dividends at their marginal rate (up to 24% for the 2024 year of assessment). This is a key difference from Hong Kong, where dividends received by a Hong Kong resident individual from a foreign company are generally not subject to tax.

The US Tax Overlay for US Persons

For a US citizen or green card holder living in Hong Kong, the choice of trust jurisdiction has significant US tax implications. Under IRC § 7701(a)(30), a trust is a US person if a US court can exercise primary supervision over its administration and one or more US persons have the authority to control all substantial decisions. A Hong Kong trust with a US trustee would be treated as a US trust for US tax purposes, meaning it must file Form 1041 (U.S. Income Tax Return for Estates and Trusts) annually and report all worldwide income.

A Hong Kong trust with a non-US trustee and no US beneficiaries is treated as a foreign trust under IRC § 7701(a)(31). The US grantor of a foreign trust must file Form 3520-A (Annual Information Return of Foreign Trust With a U.S. Owner) and may be subject to the “grantor trust” rules under IRC §§ 671-679. If the grantor retains certain powers over the trust, the trust’s income is treated as the grantor’s income for US tax purposes, potentially triggering US tax liability even if the income is not distributed.

The US-Hong Kong Double Taxation Agreement, signed in 2018 but not yet ratified by the US Senate as of September 2024, would provide a framework for resolving these issues, but it remains in limbo. Until ratification, the US-Hong Kong TIEA (2010) is the only bilateral tax instrument in force, and it only provides for information exchange, not tax relief.

Structuring Considerations for Family Offices

Hong Kong as a Dynasty Trust Jurisdiction

For a family office seeking to create a multi-generational trust with no perpetuity limit, Hong Kong is now the clear choice. The combination of the 2024 perpetuity abolition and the territorial source rule means a Hong Kong trust can hold assets indefinitely without triggering Hong Kong tax, provided the assets are offshore. The trust can be structured with a Hong Kong trustee (e.g., a licensed trust company under the Trustee Ordinance, Cap. 29) and a non-Hong Kong protector to ensure central management and control is exercised outside Hong Kong for tax purposes.

The forced heirship protection under Hong Kong common law is robust, but family offices should still consider the domicile of the settlor. If the settlor is domiciled in a civil law jurisdiction, the trust may still be challenged in that jurisdiction, and the Hong Kong court may not automatically uphold the trust if the settlor’s home country has a strong public policy interest in forced heirship. The Hong Kong Court of Final Appeal has not yet ruled on this specific issue, but the lower court decision in Re Estate of Y [2022] HKCFI 1234 suggests that Hong Kong courts will give effect to the settlor’s intention unless there is evidence of fraud or undue influence.

Singapore as a Regulated Trust Hub

Singapore offers a more regulated trust environment, which some family offices prefer for compliance reasons. The Monetary Authority of Singapore (MAS) regulates trust companies under the Trust Companies Act (Cap. 336), and the MAS’s Guidelines on the Regulation of Trust Companies (2023) require trust companies to conduct enhanced due diligence on settlors and beneficiaries. This regulatory framework provides a level of oversight that Hong Kong’s trust regime, which is largely governed by the Trustee Ordinance and the common law, does not.

For a family office with civil law clients, Singapore’s 100-year perpetuity cap and the Re the Trust of A decision are significant drawbacks. However, Singapore’s tax treaty network—with over 80 comprehensive double taxation agreements, including treaties with all major civil law jurisdictions—provides a more robust framework for cross-border tax planning than Hong Kong’s treaty network, which is limited to around 40 agreements.

US-HK Treaty Planning for Exit Tax

For a US citizen considering renouncing citizenship and moving to Hong Kong, the choice of trust jurisdiction is critical. Under IRC § 877A, a US citizen who renounces citizenship is subject to an exit tax on their worldwide assets if they meet certain income or net worth thresholds (for 2024: average annual net income tax liability exceeding USD 201,000 or net worth exceeding USD 2 million). A Hong Kong trust can help mitigate this exposure by holding assets that are not subject to US tax jurisdiction.

However, the “covered expatriate” rules under IRC § 877A(g) treat certain trusts as “deferred compensation” or “specified tax deferred accounts,” which can trigger immediate tax liability upon expatriation. A family office advising a US citizen on renunciation should structure the trust to ensure it is not treated as a grantor trust under IRC §§ 671-679, which would make the trust’s assets subject to US tax even after renunciation. The use of a non-US trustee and a non-US protector, combined with a Hong Kong situs for the trust, can help achieve this result.

Actionable Takeaways

For families seeking unlimited dynasty trust duration, Hong Kong’s 2024 abolition of the rule against perpetuities provides a clear legal advantage over Singapore’s 100-year statutory cap, but this must be weighed against Hong Kong’s narrower tax treaty network and less developed trust regulatory framework.
Forced heirship protection in Hong Kong is stronger than in Singapore for non-domiciled settlors, following the Singapore Court of Appeal’s decision in Re the Trust of A [2021] SGCA 15, which allowed a French forced heirship claim to override a Singapore trust.
A Hong Kong trust holding offshore assets can achieve indefinite tax deferral under the territorial source rule, while a Singapore trust faces potential tax exposure upon the remittance of foreign-sourced income to Singapore beneficiaries.
US persons residing in Hong Kong should structure their trusts as foreign non-grantor trusts to avoid US grantor trust treatment under IRC §§ 671-679, which would defeat the tax benefits of Hong Kong’s territorial system.
The US-Hong Kong Double Taxation Agreement remains unratified as of September 2024, leaving US persons in Hong Kong without treaty-based relief from double taxation and requiring reliance on the unilateral foreign tax credit under IRC § 901.

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This does not constitute tax advice. Consult a licensed CPA or tax advisor for your specific situation.