Hong Kong vs Singapore Estate Planning Tool Comparison: Tax Aspects of Wills, Trusts, and Enduring Powers of Attorney

The decision by the Hong Kong government to table the Inheritance (Provision for Family and Dependants) (Amendment) Bill 2025 for its first reading in January 2025 has sharpened the focus on estate planning inadequacies across the city. Simultaneously, Singapore’s 2024 Budget confirmed no changes to its estate duty regime—maintaining its 2008 abolition—while the Monetary Authority of Singapore (MAS) released updated guidelines on the governance of family offices in July 2024. These parallel developments have created a distinct window for cross-border families to re-evaluate jurisdictional toolkits. For the HNW/UHNW individual with assets spanning Hong Kong, Singapore, and beyond, the choice between these two common law jurisdictions is no longer a matter of convenience; it is a tax-driven structural decision affecting wills, trusts, and enduring powers of attorney (EPA). The operative position is clear: Hong Kong offers a statutory framework for forced heirship protection through its amended inheritance legislation, while Singapore provides a more mature trust ecosystem with explicit GST and income tax exemptions for qualifying structures. Neither jurisdiction imposes an estate duty, but the tax treatment of underlying assets during administration and distribution differs materially.

The Tax Treatment of Wills: Probate, Estate Duty, and Asset Situs

Hong Kong: No Estate Duty but a Territorial Probate Process

Hong Kong abolished estate duty for deaths occurring on or after 11 February 2006 under the Estate Duty (Abolition) Ordinance (Cap. 565). This single legislative act removed the primary tax cost of administering a will in the territory. However, the practical tax implications of probate remain tied to the situs of assets. The Probate and Administration Ordinance (Cap. 10) requires a grant of probate or letters of administration for assets physically located in Hong Kong. For a US citizen or green card holder domiciled in Hong Kong, the interaction with IRC § 2010 (the estate tax unified credit) becomes critical. The US estate tax exemption for 2025 is USD 13.61 million per individual (USD 27.22 million for married couples), indexed for inflation. Assets in Hong Kong—including Hong Kong-listed equities, real property, and bank deposits—are subject to US estate tax if the decedent was a US citizen or resident. The Hong Kong probate process does not mitigate this US exposure; it merely facilitates the legal transfer of title locally.

The Inland Revenue Department (IRD) does not impose a tax on the transmission of assets under a will. But a capital gains tax event may arise on the subsequent sale of inherited assets. Hong Kong has no general capital gains tax, but the IRD may treat gains from the sale of inherited property as trading receipts if the executor engages in a pattern of sales. The leading case is CIR v. N.V. Philips Gloeilampenfabrieken (1988) 3 HKTC 1, which established the “badges of trade” test. For a family office administering a will containing a portfolio of Hong Kong securities, the executor should document the intention to hold for investment, not trade, to avoid profits tax exposure under Section 14(1) of the Inland Revenue Ordinance (Cap. 112).

Singapore: Absence of Estate Duty and the GST on Administration Services

Singapore abolished estate duty for deaths on or after 15 February 2008. The tax landscape for will administration is therefore similar to Hong Kong in that no direct death tax applies. However, a distinct tax cost arises from the Goods and Services Tax (GST) regime. From 1 January 2024, Singapore’s GST rate stands at 9%, up from 8% in 2023. Legal fees, executor’s commissions, and trustee services incurred during probate are standard-rated supplies subject to GST unless the executor is a non-GST registered individual. For a family office using a licensed trust company as executor, the GST on administration fees becomes a real cost to the estate. This is not recoverable if the deceased was not a GST-registered business.

Singapore’s stamp duty on the transfer of shares and immovable property under a will is another consideration. Transfers of Singapore-listed shares to beneficiaries attract stamp duty at 0.2% of the consideration or market value, payable by the transferee. For real property, buyer’s stamp duty (BSD) rates range from 1% to 5% depending on value, and additional buyer’s stamp duty (ABSD) may apply if the beneficiary already owns other residential property. In Hong Kong, stamp duty on a transmission of immovable property by way of a will is generally not exigible, though a nominal fee of HKD 5 may apply for the filing of the grant of probate. This creates a clear cost advantage for Hong Kong wills holding real property.

Cross-Border Situs Conflicts: The US-HK and US-Singapore Angle

For the US citizen or green card holder, the situs of assets determines the availability of the marital deduction under IRC § 2056. A will that leaves assets to a non-US citizen spouse triggers the qualified domestic trust (QDOT) requirement under IRC § 2056A. Neither Hong Kong nor Singapore has a tax treaty with the US that modifies this rule. The US-Hong Kong Tax Information Exchange Agreement (TIEA), signed in 2014, does not address estate tax. The US-Singapore Income Tax Treaty (Article 4) defines residence for income tax purposes but is silent on estate tax. The practical outcome: a Hong Kong will leaving a Hong Kong apartment to a US citizen spouse is straightforward, but leaving the same asset to a non-US citizen spouse requires a QDOT to be established within the estate plan. This is a structural requirement, not an optional optimization.

Trusts: The Core Tax Differentiator Between the Two Jurisdictions

Hong Kong: The Territorial Source Principle and Trust Taxation

Hong Kong’s trust taxation is governed by the Inland Revenue Ordinance, which applies the territorial source principle to all forms of income. For a Hong Kong trust, only income “arising in or derived from” Hong Kong is subject to profits tax (Section 14) or salaries tax (Section 8). Offshore-sourced income—such as dividends from a BVI holding company or rental income from a UK property—is not taxable in Hong Kong, provided the trust’s central management and control is exercised outside Hong Kong. The leading authority is CIR v. Hang Seng Bank Ltd. (1990) 3 HKTC 351, which held that the source of profits is determined by the location of the operations that produced them.

For a family office establishing a Hong Kong trust, the absence of a general anti-avoidance rule (GAAR) specific to trusts is notable. Hong Kong has no statutory trust-specific GAAR, unlike Singapore’s Section 33 of the Income Tax Act. The IRD relies on the general anti-avoidance provisions in Section 61A of the IRO, which applies to “tax avoidance transactions” broadly. In practice, the IRD has rarely challenged Hong Kong trusts on source grounds if the trustee is a Hong Kong-licensed trust company and the trust deed contains a proper power to distribute offshore income. The Hong Kong trust is therefore a tax-neutral vehicle for holding non-Hong Kong assets—a structural advantage for the HNW family with a global portfolio.

The stamp duty cost of transferring Hong Kong assets into a trust is a material consideration. Transfers of Hong Kong-listed shares into a trust attract stamp duty at 0.13% on the buyer and 0.13% on the seller (total 0.26%). For Hong Kong real property, the transfer to a trust is treated as a sale for stamp duty purposes, triggering ad valorem stamp duty at rates up to 4.25% for residential property. The Hong Kong government’s 2024-25 Budget did not introduce any relief for trust transfers, meaning this cost remains a barrier to onshore trust establishment.

Singapore: The Exempt Trust Regime and Section 13O/13U Structures

Singapore offers a more explicit tax framework for trusts through its designated exempt trust structures. The Income Tax Act (Cap. 134) provides for the exemption of specified income of a trust under Section 13(1)(zh) for qualifying funds. For a family office, the Section 13O (onshore fund) and Section 13U (offshore fund) tax incentive schemes are the primary vehicles. These schemes exempt from tax the specified income derived from designated investments, provided the fund meets the minimum asset threshold of SGD 20 million (for Section 13O) or SGD 50 million (for Section 13U) and satisfies the local business spending requirement (SGD 200,000 per annum for Section 13O).

A trustee of a Singapore trust is subject to income tax at the prevailing corporate rate of 17% on trust income not covered by an exemption. However, foreign-sourced income remitted to Singapore by a trust is exempt from tax under Section 13(1)(ja) of the Income Tax Act, provided the foreign tax has been paid in the source jurisdiction at a rate of at least 15%. This is a critical distinction from Hong Kong, where foreign-sourced income is simply outside the tax net regardless of foreign tax paid. For a trust holding US-sourced assets, the US-Hong Kong TIEA does not provide a foreign tax credit mechanism; the Singapore regime does, through a unilateral credit under Section 50 of the Income Tax Act.

Singapore’s stamp duty on trust transfers is more punitive than Hong Kong’s. Transfers of Singapore shares attract stamp duty at 0.2% (unchanged from 2023). For residential property transferred into a trust, the ABSD of 35% applies to the transferee if the trust is treated as a separate legal entity. The MAS guidelines issued in July 2024 clarified that a family office trust that does not meet the Section 13O/13U conditions will be treated as a standard trust for ABSD purposes, eliminating any planning ambiguity.

US Tax Implications: Grantor Trust Rules and PFIC Exposure

For the US citizen or green card holder who is a settlor or beneficiary of a Hong Kong or Singapore trust, the US grantor trust rules under IRC §§ 671-679 override local tax treatment. A trust with a US grantor who retains the power to revoke or control the trust is a grantor trust, and all income is taxable to the grantor at US rates regardless of where the trust is sitused. A foreign trust with a US beneficiary is a non-grantor trust, and distributions to the US beneficiary are subject to the throwback tax rules under IRC § 665, which apply a compounding interest charge on accumulated income.

The passive foreign investment company (PFIC) rules under IRC §§ 1291-1298 are a specific trap for trusts holding non-US investment funds. A Hong Kong unit trust or a Singapore collective investment scheme held within a trust is a PFIC unless the trust elects to treat the fund as a qualified electing fund (QEF). The QEF election requires the trust to report the fund’s pro-rata share of earnings and profits annually—a compliance burden that many Hong Kong trust companies are not equipped to handle. The IRS examination cycle for foreign trusts has increased since the 2023 update to the Foreign Trust Annual Return (Form 3520-A), with the IRS Large Business & International division now reviewing an estimated 8% of filings for compliance with the throwback rules.

Enduring Powers of Attorney: Tax Authority and Decision-Making

Hong Kong: The Mental Capacity Ordinance and IRD Interaction

The Enduring Powers of Attorney Ordinance (Cap. 501) governs EPAs in Hong Kong. The key tax consideration is the authority of the attorney to make tax filings and payments on behalf of the donor. The IRD does not have a specific form for registering an EPA for tax purposes; instead, the attorney must provide the original EPA or a certified copy to the IRD when filing a tax return (e.g., Profits Tax Return, Salaries Tax Return, or Property Tax Return). The IRD’s internal practice, as outlined in the Departmental Interpretation and Practice Notes (DIPN) No. 1 (Revised 2023), requires that the attorney’s authority be “clear and unambiguous” regarding the specific tax matter.

For a US citizen donor, the EPA must explicitly authorize the attorney to file IRS forms, including Form 1040, Form 8938 (Statement of Specified Foreign Financial Assets), and FinCEN Form 114 (FBAR). The IRS does not recognize a Hong Kong EPA as a valid power of attorney for US tax purposes. The attorney must execute IRS Form 2848 (Power of Attorney and Declaration of Representative). This creates a dual-authorization requirement: the Hong Kong EPA for local matters and IRS Form 2848 for US tax matters. Failure to execute both leaves the attorney unable to represent the donor before the IRS during an examination, which can extend the statute of limitations under IRC § 6501(c)(4) if the IRS asserts a deficiency.

Singapore: The Mental Capacity Act and IRAS Registration

Singapore’s Mental Capacity Act (Cap. 177A) provides for a statutory EPA framework. The tax authority, IRAS, requires the attorney to register with IRAS as a “tax agent” for the donor if the attorney will handle tax matters. This registration is done through the IRAS myTax Portal, and the attorney must provide a certified copy of the EPA. The GST implications of an attorney’s actions are more significant in Singapore than Hong Kong. If the attorney sells an asset of the donor, the proceeds may be subject to GST if the donor was GST-registered. The attorney must determine the donor’s GST status before any disposal.

The cross-border tax filing requirement mirrors Hong Kong’s dual-authorization issue. For a US citizen donor living in Singapore, the attorney must execute IRS Form 2848 separately. The US-Singapore Income Tax Treaty does not provide for mutual recognition of powers of attorney. The practical recommendation for a family office managing the affairs of an incapacitated US citizen in Singapore is to establish a revocable living trust in the US to hold the Singapore assets, thereby avoiding the need for an EPA for those assets altogether.

The Practical Gap in Both Jurisdictions

Neither Hong Kong nor Singapore has a statutory framework for “springing” powers of attorney (i.e., an EPA that takes effect only upon incapacity). Both jurisdictions require the EPA to be registered immediately upon execution. This means the attorney has authority from the date of registration, not from the date of incapacity. For tax purposes, this creates a compliance risk: the attorney may be deemed to have authority to file tax returns even before the donor is incapacitated, potentially creating a conflict of interest. The Hong Kong Law Reform Commission’s 2023 report on the review of the EPA system recommended introducing a springing EPA, but no legislation has been tabled as of Q1 2025.

Closing Section: Actionable Takeaways

1. For a US citizen or green card holder, a Hong Kong will must be supplemented by a separate US will for US-situs assets (e.g., US real estate, US brokerage accounts) to avoid ancillary probate in the US and the associated estate tax filing requirement under IRC § 6018.
2. A Hong Kong trust holding offshore assets is tax-neutral, but the stamp duty cost of transferring Hong Kong real property into the trust (up to 4.25%) should be modelled against the Singapore Section 13O alternative, which exempts trust income from tax but requires SGD 200,000 in annual local business spending.
3. The Singapore GST of 9% on executor’s fees and legal costs is an unavoidable cost of will administration; Hong Kong’s absence of a comparable indirect tax makes it the lower-cost jurisdiction for will execution.
4. An EPA executed in Hong Kong or Singapore does not grant authority to file US tax returns; a separate IRS Form 2848 is mandatory for any attorney acting for a US person, and this form must be filed before the IRS examination cycle begins.
5. The 2025 Inheritance (Provision for Family and Dependants) (Amendment) Bill in Hong Kong expands the class of eligible claimants to include stepchildren and cohabiting partners, making it essential to review existing wills and trust deeds for potential challenges that could delay probate and trigger tax filing deadlines under IRC § 6075(a) (nine months from date of death for US estate tax return).

本文不構成稅務建議。涉及個人稅務情況請諮詢持牌會計師或稅務師。 This does not constitute tax advice. Consult a licensed CPA or tax advisor for your specific situation.