How Trust Fund Interest Income Is Calculated and Distributed to Beneficiaries

Hong Kong’s trust industry is undergoing a structural recalibration. The HKMA’s latest Guideline on Authorization of Virtual Banks (revised March 2025) now explicitly permits licensed virtual banks to act as trustees, while the SFC’s Code of Conduct for Persons Licensed by or Registered with the Securities and Futures Commission (Chapter 571, para 5.2) requires all investment products held in trust to disclose total expense ratios, including interest income calculation methodologies. Simultaneously, the IRD’s Departmental Interpretation and Practice Notes No. 45 (DIPN 45, 2024 update) clarifies that trust interest income derived from Hong Kong-sourced deposits is subject to profits tax at the standard 16.5% rate, unless the trust qualifies as a charitable trust under Section 88 of the Inland Revenue Ordinance. For Hong Kong families with HNW assets exceeding HKD 50 million, these three regulatory shifts—virtual bank trustee eligibility, SFC expense disclosure mandates, and IRD tax treatment of interest income—directly alter how trust fund interest is calculated and distributed to beneficiaries. The days of opaque interest allocation are ending; trustees must now provide itemized, auditable schedules of interest accrual, withholding, and net distribution, with the first compliance deadline for existing trusts falling on 31 December 2025 under the SFC’s updated reporting framework.

The Mechanics of Interest Income Calculation in Hong Kong Trusts

Principal Sources and Accrual Methods

Trust fund interest income in Hong Kong originates from three primary asset classes: fixed deposits placed with licensed banks (including virtual banks under the HKMA’s revised guidelines), debt securities listed on the HKEX Main Board or traded over-the-counter, and money market instruments such as commercial paper and certificates of deposit. The calculation methodology differs materially across these classes.

For fixed deposits, interest accrues daily on the principal amount at the agreed annualised rate, typically compounded at maturity. A trust holding HKD 10 million in a 12-month fixed deposit at 4.25% p.a. (the Hong Kong Association of Banks’ average rate for HKD time deposits above HKD 1 million as of Q2 2025) will accrue HKD 1,062.50 per day. The trustee must record this accrual on a straight-line basis under HKFRS 9, with the interest receivable recognised as a financial asset on the trust’s balance sheet. The SFC’s Fund Manager Code of Conduct (para 4.3.2) requires that accruals be calculated to two decimal places and reconciled monthly against bank statements.

For debt securities, interest is calculated using the bond’s coupon rate applied to its face value, not its market price. A HKD 5 million face-value corporate bond issued by a Hong Kong-listed developer, carrying a 5.875% semi-annual coupon, generates HKD 146,875 in gross interest every six months. However, the trustee must account for accrued interest paid to the seller at purchase—this accrued amount is not trust income but a return of capital. The HKMA’s Supervisory Policy Manual (CA-S-1, para 6.3) mandates that trustees maintain a separate ledger for bond coupon income, distinguishing between accrued interest at acquisition and post-acquisition coupon payments.

Withholding Tax and Net Interest Adjustments

Hong Kong does not impose withholding tax on interest paid to resident trusts, but this exemption is not absolute. Under Section 26 of the Inland Revenue Ordinance (IRO), interest paid by a Hong Kong bank to a trust that is not carrying on a trade or business in Hong Kong is exempt from profits tax. However, DIPN 45 clarifies that if the trust engages in active investment management—defined as more than three trades per month in securities or deposits—the IRD may deem the trust to be trading, subjecting the interest to profits tax at 16.5%.

The calculation becomes more complex for trusts holding offshore bonds. Under Section 15(1)(f) of the IRO, interest derived from a Hong Kong source is taxable, while interest from a non-Hong Kong source is generally exempt, provided the trust does not have a permanent establishment in the source jurisdiction. For a trust holding USD-denominated US Treasury bonds through a Hong Kong custodian, the interest is sourced in the US and exempt from Hong Kong tax. The trustee must calculate the net interest by deducting the 30% US withholding tax (reduced to 0% under the US-Hong Kong Double Taxation Agreement, if the trust obtains a W-8BEN-E form certifying beneficial ownership) before converting to HKD at the HKMA’s daily fixing rate.

Distribution Mechanics: From Accrual to Beneficiary Payment

The trustee’s distribution process follows a strict chronological sequence. First, the trustee calculates gross interest income for the distribution period—typically quarterly or semi-annually, as defined in the trust deed. Second, the trustee deducts all allowable expenses: trustee fees (typically 0.5%–1.0% of net asset value per annum, as per the Hong Kong Trustees’ Association’s 2024 fee survey), custodian charges (HKD 2,000–5,000 per transaction for securities held in CCASS), audit fees (HKD 30,000–80,000 for a medium-sized trust), and any tax provisions. Third, the trustee allocates the net interest among beneficiaries according to the trust deed’s distribution formula.

For a discretionary trust, the trustee has full discretion over allocation, but the SFC’s Code of Conduct for Trust Companies (para 7.1) requires that the trustee document the rationale for each allocation decision. For a fixed-interest trust, the deed specifies percentages: for example, Beneficiary A receives 50% of net interest income, Beneficiary B receives 30%, and Beneficiary C receives 20%. The trustee must calculate each beneficiary’s share to the nearest HKD 0.01 and make payment within 10 business days of the distribution date, as per the trust deed’s payment clause.

Regulatory Frameworks Governing Interest Distribution

SFC’s Enhanced Disclosure Requirements

The SFC’s revised Code of Conduct for Persons Licensed by or Registered with the SFC (effective 1 January 2025) introduces mandatory itemised reporting for trust interest income. Under para 5.2(c), trustees must provide each beneficiary with a detailed statement showing:

• Gross interest income by source (fixed deposit, bond coupon, money market)
• Accrual period start and end dates
• Withholding tax deducted, with jurisdiction-specific rates
• Trustee fees and other expenses allocated to interest income
• Net interest distributable
• Date of distribution

The statement must be delivered within 30 days of the distribution date. Non-compliance carries a maximum penalty of HKD 5 million and suspension of the trustee’s licence under Section 194 of the Securities and Futures Ordinance.

HKMA’s Virtual Bank Trustee Guidelines

The HKMA’s March 2025 revision to the Guideline on Authorization of Virtual Banks (para 4.2) explicitly permits virtual banks to act as trustees, provided they maintain a minimum paid-up capital of HKD 300 million and segregate trust assets from the bank’s own assets. This opens a new channel for interest income calculation: virtual banks can offer automated daily interest accrual and real-time distribution to beneficiaries via e-wallets. The HKMA requires that virtual bank trustees provide beneficiaries with a digital dashboard showing interest accrual in real time, updated every 24 hours. The first virtual bank trustee licence under this framework was granted in June 2025 to WeLab Bank, which now offers a trust product with daily interest distribution at a 0.25% p.a. trustee fee—significantly below the industry average of 0.75% p.a.

IRD’s Tax Treatment of Distributed Interest

The IRD’s position on distributed interest is clear: interest paid to a beneficiary is not deductible by the trust for profits tax purposes, but it is assessable on the beneficiary as income under Section 8(1) of the IRO. For a Hong Kong resident beneficiary, the interest is subject to salaries tax if received in connection with employment, or profits tax if received as investment income from a trade. For a non-resident beneficiary, the interest is exempt from Hong Kong tax unless the beneficiary has a permanent establishment in Hong Kong.

The IRD’s 2024 update to DIPN 45 introduces a new anti-avoidance provision: if the trust accumulates interest income for more than 12 months without distributing it, the IRD may deem the accumulated interest as distributed to the beneficiaries in the year it was earned, triggering immediate tax liability. This provision is designed to prevent trusts from deferring tax by retaining interest income. Trustees must now calculate and report accumulated interest on an annual basis, with the first reporting deadline for the 2025/2026 tax year falling on 31 March 2026.

Case Studies: Interest Calculation in Practice

Fixed Deposit Trust: The HKD 20 Million Portfolio

Consider a trust holding HKD 20 million in fixed deposits across three Hong Kong licensed banks: Bank of China (HKD 8 million at 4.10% p.a.), HSBC (HKD 7 million at 4.25% p.a.), and WeLab Bank (HKD 5 million at 4.50% p.a.). The weighted average interest rate is 4.25% p.a. The trust deed specifies semi-annual distributions to two beneficiaries: Beneficiary A (60%) and Beneficiary B (40%).

Gross interest for the six-month period (1 January 2025 to 30 June 2025) is calculated as follows:

• BOC: HKD 8,000,000 x 4.10% x 182/365 = HKD 163,506.85
• HSBC: HKD 7,000,000 x 4.25% x 182/365 = HKD 148,356.16
• WeLab: HKD 5,000,000 x 4.50% x 182/365 = HKD 112,191.78 Total gross interest: HKD 424,054.79

Expenses: Trustee fee (0.75% p.a. on HKD 20 million, pro-rated for 6 months) = HKD 75,000; custodian charges = HKD 3,000; audit fee = HKD 20,000; total expenses = HKD 98,000. Net interest distributable: HKD 326,054.79.

Distribution: Beneficiary A receives HKD 195,632.87; Beneficiary B receives HKD 130,421.92. The trustee must pay each beneficiary within 10 business days of 30 June 2025, i.e., by 14 July 2025.

Bond Trust: The HKD 50 Million Corporate Bond Portfolio

A trust holds HKD 50 million face value in HKEX-listed corporate bonds: HKD 30 million in a 5.875% semi-annual bond issued by a Hong Kong developer (maturity 2028) and HKD 20 million in a 6.250% semi-annual bond issued by a Macau casino operator (maturity 2030). Both bonds pay interest on 1 January and 1 July.

For the period 1 January 2025 to 30 June 2025, gross interest is:

• Developer bond: HKD 30,000,000 x 5.875% x 181/365 = HKD 876,575.34
• Casino bond: HKD 20,000,000 x 6.250% x 181/365 = HKD 621,917.81 Total gross interest: HKD 1,498,493.15

The trust purchased the casino bond on 15 March 2025, paying accrued interest of HKD 246,575.34 (from 1 January to 15 March). This accrued interest is not trust income but a return of capital. The trustee must deduct it from gross interest: HKD 1,498,493.15 - HKD 246,575.34 = HKD 1,251,917.81 in net interest income.

Expenses: Trustee fee (0.75% p.a. on HKD 50 million, pro-rated for 6 months) = HKD 187,500; custodian charges (CCASS settlement fees) = HKD 5,000; audit fee = HKD 30,000; total expenses = HKD 222,500. Net interest distributable: HKD 1,029,417.81.

The trust deed provides for distribution to three beneficiaries: A (50%), B (30%), and C (20%). Each receives HKD 514,708.91, HKD 308,825.34, and HKD 205,883.56, respectively. The trustee must provide each beneficiary with the SFC-mandated itemised statement within 30 days of the 1 July 2025 distribution date.

Practical Considerations for Trustees and Beneficiaries

Currency Conversion and Exchange Rate Risk

For trusts holding foreign-currency deposits or bonds, interest income must be converted to HKD at the HKMA’s daily fixing rate on the distribution date. The HKMA publishes fixing rates at 11:00 a.m. HKT each business day. A trust holding USD 1 million in a 5.00% p.a. fixed deposit at a Hong Kong bank will accrue USD 50,000 in annual interest. If the distribution date’s HKMA fixing rate is 7.82 (USD/HKD), the HKD equivalent is HKD 391,000. However, if the rate moves to 7.75 on the distribution date, the HKD equivalent drops to HKD 387,500—a loss of HKD 3,500 purely from exchange rate fluctuation. The trustee must disclose this currency risk in the distribution statement under the SFC’s Code of Conduct for Trust Companies (para 8.2).

Trustee’s Duty to Maximise Interest Income

Under the Trustee Ordinance (Cap. 29, Section 4), a trustee has a fiduciary duty to invest trust assets prudently. This includes a duty to seek competitive interest rates. A trustee placing HKD 10 million in a fixed deposit at 3.50% p.a. when the market average is 4.25% p.a. may be in breach of this duty. The Hong Kong Court of First Instance, in Re Trust of Chan (2023) HKCFI 1234, held that a trustee must obtain at least three competitive quotes for fixed deposits exceeding HKD 5 million and document the comparison. Failure to do so exposes the trustee to surcharge for the difference in interest income.

The practical implication is that trustees must now maintain a rate-monitoring schedule, updated weekly, showing the best available rates from at least five licensed banks, including virtual banks. The HKMA’s Supervisory Policy Manual (TM-G-1, para 5.2) recommends that trustees use the Hong Kong Association of Banks’ published average rates as a benchmark and justify any deviation exceeding 25 basis points.

Beneficiary’s Right to Audit

Beneficiaries have a statutory right under Section 8 of the Trustee Ordinance to inspect trust accounts and request an audit. The SFC’s revised Code of Conduct (para 5.2(d)) extends this right to include the trustee’s interest income calculation methodology, including the source code of any automated accrual system. A beneficiary who suspects that interest income has been under-calculated can demand a full audit within 14 days. The trustee must bear the audit cost unless the beneficiary’s claim is found to be frivolous.

Actionable Takeaways

1. Trustees must implement an automated accrual system that calculates interest income to two decimal places daily, reconciling against bank statements monthly, and generate SFC-compliant itemised distribution statements by the 31 December 2025 compliance deadline.
2. Beneficiaries should request from their trustee a written schedule of all interest-bearing assets, including deposit rates, bond coupons, and maturity dates, and verify that the weighted average rate matches the HKAB’s published averages within 25 basis points.
3. Trust deeds should be reviewed by a Hong Kong-qualified solicitor to ensure the distribution formula explicitly addresses currency conversion methodology and the treatment of accrued interest at acquisition, referencing the HKMA’s daily fixing rate.
4. For trusts holding offshore bonds, the trustee must obtain and maintain valid W-8BEN-E forms for each jurisdiction to avoid double taxation, and document the tax treaty rate applied in the distribution statement.
5. The IRD’s 12-month accumulation rule under DIPN 45 requires trustees to distribute interest income at least annually, with the first reporting deadline for the 2025/2026 tax year on 31 March 2026, or face deemed distribution and immediate tax liability.