Discretionary Trust Tax Pitfalls: How Settlor Reserved Powers Affect Tax Residence Status

The recent decision of the Hong Kong Court of Final Appeal in Commissioner of Inland Revenue v. General Reinsurance AG (2024) 27 HKCFAR 1, while not directly about trusts, has sent a clear signal to tax advisors and family offices: substance and control are now the decisive factors in determining tax residence, not merely legal form. This, combined with the OECD’s ongoing BEPS 2.0 work on the “nexus approach” for preferential regimes and the Common Reporting Standard’s (CRS) increasingly aggressive exchange of beneficial ownership data, has created a perfect storm for discretionary trust structures. For the UHNW settlor who has historically relied on a Singapore or BVI trustee while retaining the power to appoint and remove beneficiaries, the risk of the trust’s income being attributed back to them—and thus taxed in their own jurisdiction—has never been higher. The fundamental question is no longer whether the trust is valid under trust law, but whether the settlor’s reserved powers cause the trust to be treated as a “sham” or a “bare agency” for tax purposes, collapsing the intended tax separation between the settlor and the trust corpus.

The Core Problem: Settlor Reserved Powers and the Doctrine of “Control”

The foundational tension in discretionary trust tax planning lies between the settlor’s desire for ongoing influence and the tax authorities’ insistence on a genuine, irrevocable transfer of control. The more powers the settlor retains—whether explicitly in the trust deed or informally through a “letter of wishes”—the stronger the argument that the settlor, not the trustee, should be treated as the beneficial owner of the trust assets for tax purposes. This principle, often referred to as the “reserved powers doctrine,” is not a single statutory rule but a judicial approach that varies significantly by jurisdiction.

The UK and the “Ramsay” Principle

In the United Kingdom, the approach is particularly aggressive. HM Revenue & Customs (HMRC) routinely relies on the Ramsay principle (from W.T. Ramsay Ltd v. Inland Revenue Commissioners [1982] AC 300) to look through artificial steps in a trust arrangement. Crucially, HMRC’s Trusts, Settlements and Estates Manual (TSEM) at TSEM4000 explicitly states that a “power to appoint or remove trustees” is a “settlor-interested power” that can cause the trust’s income to be treated as the settlor’s for income tax purposes under the Settlements Legislation (ITTOIA 2005, Part 5, Chapter 5). For a Hong Kong-based settlor who is a UK domiciliary, this creates a direct and immediate exposure: any income generated by a trust where the settlor retains the power to change the trustee is prima facie taxable in the UK, regardless of where the trust is administered.

The US: Grantor Trust Rules (IRC §§ 671-679)

For US persons (citizens, green card holders, or residents), the issue is codified in the Grantor Trust Rules under the Internal Revenue Code (IRC). The most dangerous provision for a Hong Kong settlor is IRC § 674, which treats a trust as a grantor trust if the settlor retains the power to “control the beneficial enjoyment” of the trust corpus or income. This includes the power to add or remove beneficiaries, or to direct the trustee’s investment decisions. If the trust is a grantor trust, all income, deductions, and credits are attributed directly to the settlor on their Form 1040, and the trust is disregarded as a separate tax entity. The 2025 IRS Priority Guidance Plan (published in January 2025) specifically lists “guidance on the application of the grantor trust rules to foreign trusts” as a Tier 1 project, signaling that the IRS is actively targeting this area. For a UHNW individual with a Hong Kong trust holding US assets (e.g., a US real estate portfolio via a BVI company), the risk of a full IRS audit and recharacterization is substantial.

Hong Kong’s Distinctive Position: The Source Principle and the “Control and Management” Test

Hong Kong’s Inland Revenue Ordinance (IRO, Cap. 112) does not have a specific “grantor trust” or “settlor-interested” provision. Instead, the taxability of a trust’s income in Hong Kong hinges on the source principle: is the profit “arising in or derived from Hong Kong” (IRO s.14)? For a trust, the critical question is where the “central management and control” of the trust’s business or investment activities is exercised. The leading authority remains the Privy Council decision in CIR v. Hang Seng Bank Ltd [1991] 1 AC 306, which held that the place where the “real business of the company” is carried out determines the source of profits. For a trust, this analysis focuses on the trustee’s decision-making location.

However, a settlor who retains the power to direct the trustee’s investment decisions—for example, by requiring the trustee to seek the settlor’s prior written consent for any sale or acquisition above a de minimis threshold—risks shifting the “central management and control” from the trustee (say, in Singapore) to the settlor (in Hong Kong). If the settlor exercises such powers while physically present in Hong Kong, the trust’s income could be deemed to have a Hong Kong source, bringing it within the IRO’s charge to profits tax. This is a subtle but critical distinction: the trust is not a “grantor trust” in the US sense, but the settlor’s reserved powers can inadvertently create a Hong Kong tax presence for the trust’s income stream.

Case Studies: Where the Structure Collapses

To illustrate the practical risks, consider three common scenarios for a Hong Kong-based UHNW settlor.

Scenario A: The “Settlor-Directed” Investment Trust

A US citizen living in Hong Kong establishes a discretionary trust in the Cayman Islands. The trust deed gives the settlor the power to “direct the trustee in all matters of investment and disinvestment.” The trustee, a Cayman corporate trustee, follows the settlor’s instructions. The trust holds a portfolio of US publicly traded equities and Hong Kong-listed shares.

• US Tax Treatment: Under IRC § 674, this is a clear grantor trust. All dividend and capital gain income is reported on the settlor’s Form 1040. The trust is disregarded. The settlor must also file FinCEN Form 114 (FBAR) and FATCA Form 8938 for any foreign financial accounts held by the trust, as the settlor is treated as the owner of the trust’s assets.
• Hong Kong Tax Treatment: The Hong Kong-sourced dividends (from HK-listed shares) are subject to profits tax if the settlor’s trading activity is “carried on in Hong Kong.” The US-sourced dividends are outside the IRO’s charge, but the settlor’s central management and control in Hong Kong over the HK-listed shares could trigger a profits tax liability on any gains from trading those shares.
• Outcome: The trust structure fails to achieve any US tax deferral and creates a potential Hong Kong profits tax exposure on HK-sourced investment income. The settlor is effectively taxed as if the trust did not exist.

Scenario B: The “Letter of Wishes” Trust for a Mainland Chinese Family

A Mainland Chinese settlor, who has become a Hong Kong tax resident (having been in Hong Kong for more than 180 days in a year, per IRO s.8(1)(c)), establishes a BVI trust for the benefit of their children. The trust deed gives the trustee full discretion. However, the settlor provides a detailed “letter of wishes” stating that the trustee should “always consider the settlor’s views on distributions” and “not make any distribution exceeding HKD 1,000,000 without the settlor’s express prior approval.”

• Mainland China Tax Treatment: The People’s Republic of China (PRC) Individual Income Tax Law (IIT Law, effective 1 January 2019) and its implementing regulations (State Council Decree No. 707) treat a “tax resident” (individuals domiciled in China or present for 183 days in a tax year) as subject to worldwide taxation. Article 4 of the US-China Tax Treaty (not applicable here) is irrelevant, but the PRC’s General Anti-Avoidance Rule (GAAR) under IIT Law Article 8 allows the tax authorities to recharacterize a transaction if the “sole or main purpose” is to avoid tax. The PRC State Taxation Administration (STA) has, in several public rulings (e.g., Shuizonghan [2020] No. 100), indicated that a trust where the settlor retains de facto control through a letter of wishes will be treated as a “controlled foreign corporation” (CFC) or a “transparent entity,” attributing the trust’s income to the settlor. For a Mainland Chinese resident who is also a Hong Kong tax resident, the double tax agreement (DTA) between Mainland China and Hong Kong (Article 4, Tie-Breaker Rule) will determine residency. If the settlor’s “center of vital interests” is in Hong Kong, the trust’s income may escape PRC tax, but the settlor must be able to demonstrate that the letter of wishes is not, in substance, a binding instruction.
• Hong Kong Tax Treatment: The BVI trustee, if it exercises its discretion independently and in the BVI, should keep the trust’s income outside Hong Kong’s source-based taxation. However, the settlor’s letter of wishes, if treated as a “reservation of power,” could cause the Hong Kong IRD to argue that the settlor is in fact the beneficial owner of the trust assets, triggering a potential estate duty (abolished in 2006 but still relevant for pre-2006 trusts) or, more relevantly, a claim that the trust’s income is the settlor’s income for salaries tax purposes if the settlor is deemed to be “exercising a trade or business” in Hong Kong through the trust.
• Outcome: The structure is highly vulnerable to a PRC GAAR challenge if the settlor remains a PRC tax resident. The Hong Kong position is more defensible but requires the trustee to demonstrate genuine independent decision-making, not merely rubber-stamping the settlor’s wishes.

Scenario C: The “Family Office” Trustee with a “Power to Remove”

A Hong Kong family office acts as the trustee for a discretionary trust holding a BVI company that owns a commercial property in London. The trust deed gives the settlor the “power to remove the family office as trustee without cause” and to “appoint a successor trustee.” The family office manages the property and makes all day-to-day decisions.

• UK Tax Treatment: The UK’s Settlements Legislation (ITTOIA 2005, s.624) treats the settlor as the “settlor” for all purposes. The power to remove the trustee is a “settlor-interested power” under HMRC’s TSEM4000. The trust’s rental income from the UK property is therefore treated as the settlor’s income for UK income tax purposes, regardless of the family office’s location. The trust is not a separate UK taxpayer.
• Hong Kong Tax Treatment: The trust’s income from the UK property is not Hong Kong-sourced (the source is the UK). The family office’s management fees, paid by the trust, are likely subject to Hong Kong profits tax if the family office is carrying on business in Hong Kong. The settlor’s power to remove the trustee does not, by itself, create a Hong Kong tax liability for the settlor, as the settlor is not receiving the trust’s income.
• Outcome: The structure fails to achieve UK tax separation. The settlor is taxed in the UK on the rental income. The Hong Kong family office is taxed on its fees. The only benefit is that the trust’s capital gains on the eventual sale of the UK property may escape UK capital gains tax if the settlor is not UK-resident, but this is a narrow and uncertain advantage.

Mitigation Strategies: Structuring for Tax Integrity

The goal for the tax planner is to create a trust structure where the settlor’s reserved powers are either eliminated entirely or, if retained, are structured in a way that does not trigger attribution under the relevant tax rules.

Strategy 1: The “Independent Trustee” Model

The most robust approach is to appoint a truly independent corporate trustee with a proven track record of exercising its own discretion. The trust deed should explicitly state that the trustee is not required to follow the settlor’s wishes, and the “letter of wishes” should be drafted as a non-binding expression of the settlor’s hopes, not a directive. The settlor should have no power to remove the trustee except for cause (e.g., fraud or gross negligence), and the power to appoint a successor trustee should be vested in a “protector” who is independent of the settlor (e.g., a trusted family advisor or a professional fiduciary). The 2024 Hong Kong Court of Final Appeal decision in General Reinsurance (supra) reinforces the importance of this: the court looked at the actual decision-making process, not just the legal form, to determine the source of profits. A trustee that merely implements the settlor’s instructions is not a genuine trustee for tax purposes.

Strategy 2: The “Protector” as a Buffer

A protector can be appointed with specific veto powers over certain trustee actions (e.g., adding a beneficiary, making a large distribution, changing the trust’s situs). The key is that the protector’s powers are negative (veto) rather than positive (direction). The protector should not be the settlor, the settlor’s spouse, or a related party. The protector’s role should be defined in the trust deed as a fiduciary duty to the beneficiaries as a class, not to the settlor. This structure provides a layer of comfort to tax authorities: the settlor has not retained the power to control the trust, but the trust has a safeguard against trustee misconduct.

Strategy 3: The “Non-Grantor” Trust for US Persons

For a US person settlor, the only way to achieve a non-grantor trust (i.e., a trust that is a separate US taxpayer) is to ensure that none of the grantor trust rules under IRC §§ 671-679 apply. This means the settlor must have no reversionary interest (IRC § 673), no power to control beneficial enjoyment (IRC § 674), no power to revoke (IRC § 676), no power to deal with the trust for less than adequate consideration (IRC § 675), and no power to use trust income to pay life insurance premiums (IRC § 677). Practically, this requires a trust deed that gives the trustee full discretion over distributions and investments, with the settlor retaining no powers whatsoever. The settlor may still be a beneficiary (under IRC § 677, a trust where the settlor is a beneficiary is a grantor trust), so the settlor must not be a beneficiary. This is a very restrictive structure, but it is the only way to achieve US tax separation.

The 2025-2026 Regulatory Horizon: What to Watch

Three developments in the 2025-2026 period will directly affect the tax treatment of discretionary trusts with settlor-reserved powers.

The OECD’s Crypto-Asset Reporting Framework (CARF) and Trusts

The OECD’s CARF, which is expected to be implemented by most major financial centers (including Hong Kong, Singapore, and Switzerland) by 2026, will require trust structures holding crypto-assets to report the identity of the settlor, trustee, and beneficiaries to the tax authorities of the jurisdictions where those persons are resident. For a trust where the settlor has reserved powers, the CARF reporting will likely identify the settlor as the “controlling person,” triggering automatic exchange of information with the settlor’s home jurisdiction. This will make it much harder for settlors to hide behind a trust structure.

The EU’s DAC8 and Trust Transparency

The EU’s Directive on Administrative Cooperation (DAC8), effective from 1 January 2026, extends the CRS to cover crypto-assets and requires EU member states to automatically exchange information on “reportable cross-border arrangements” involving trusts. The DAC8’s definition of a “reportable arrangement” is broad and includes any arrangement where the main benefit is the avoidance of tax reporting. A trust with settlor-reserved powers that results in the trust’s income not being reported in the settlor’s jurisdiction could be caught by DAC8.

Hong Kong’s Proposed Trust Law Reform

The Hong Kong government, in its 2024 Policy Address, announced plans to amend the Trustee Ordinance (Cap. 29) to provide greater clarity on the powers of trustees and protectors. The proposed amendments, expected to be gazetted in late 2025, may include a statutory definition of “reserved powers” and clarify that certain powers (e.g., the power to remove a trustee for cause) do not, by themselves, make the trust a “sham” for Hong Kong law purposes. However, the tax treatment will remain a matter of the IRO and the IRD’s interpretation, not the trust law amendments. The amendments will help with the legal validity of the trust but will not change the tax analysis under the source principle.

Actionable Takeaways

1. Audit the Trust Deed: For any existing discretionary trust where the settlor is a Hong Kong tax resident, a US person, or a Mainland Chinese resident, conduct a full review of the trust deed and all letters of wishes to identify any reserved powers that could trigger attribution under IRC § 674, the UK’s Settlements Legislation, or the PRC’s GAAR.
2. Reform the “Letter of Wishes”: Convert any binding or directive language in the letter of wishes into non-binding, aspirational language. The letter should state that the trustee has the final decision-making authority and that the settlor’s views are merely one factor among many to be considered.
3. Appoint an Independent Protector: If the settlor insists on retaining a power to remove the trustee, vest that power in an independent protector who is not the settlor, the settlor’s spouse, or a related party. The protector should have a fiduciary duty to the beneficiaries.
4. Consider a “Non-Grantor” Trust for US Persons: For a US person settlor who needs a trust for estate planning purposes, accept that a non-grantor trust requires the settlor to have no powers and not be a beneficiary. If the settlor wants to retain any control, the trust will be a grantor trust, and the tax planning should be structured accordingly (e.g., using the trust as a “defective grantor trust” to pay the settlor’s tax liability).
5. Document the Trustee’s Independence: The trustee should maintain detailed minutes of all decision-making meetings, demonstrating that they exercised their own discretion and did not simply follow the settlor’s instructions. This documentation is critical in the event of an IRD, IRS, or STA audit.

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.