Joint Account Interest Income: Tax Apportionment for Couples' Joint Savings

For a married couple in Hong Kong holding a joint savings account, the Inland Revenue Department (IRD) does not automatically split the interest income 50/50. The default position under the Inland Revenue Ordinance (Cap. 112) is that the person who is beneficially entitled to the interest is the one chargeable to tax. This seemingly straightforward rule creates a recurring compliance puzzle for Hong Kong’s middle-class couples, particularly as the 2025/26 tax year sees the basic allowance rising to HKD 136,000 and the marginal tax band widening. With Hong Kong’s deposit base exceeding HKD 7.8 trillion (HKMA, 2024), even a modest HKD 500,000 joint savings account yielding 4% interest generates HKD 20,000 in annual income. The IRD’s practice, outlined in Departmental Interpretation and Practice Notes (DIPN) No. 44 (Revised), requires a factual analysis of beneficial ownership—not a mechanical split. For the 2025/26 tax return filing season, understanding how to correctly apportion this income can mean the difference between a tax-free allowance and an unexpected salaries tax assessment.

The Statutory Framework: Beneficial Ownership Over Nominal Ownership

Section 8(1) of the IRO: The Charge to Salaries Tax

The charge to salaries tax under Section 8(1) of the IRO applies to “income arising in or derived from Hong Kong” from any employment, office, or pension. Interest income from a savings account, however, falls under the broader definition of “income” chargeable under Part IV of the IRO, specifically Section 14 (Profits Tax) or, in the case of individuals not carrying on a trade, as a separate head of income. The IRD’s position, as clarified in DIPN No. 44, is that interest on a joint account is assessable on the person who is beneficially entitled to the interest. The IRD does not presume a 50/50 split. This is a critical distinction from jurisdictions like the United States, where the Internal Revenue Service (IRS) generally presumes a 50/50 split for joint accounts held by spouses under community property rules.

The Burden of Proof: Who Owns the Funds?

The IRD will examine the source of the funds deposited into the joint account. If one spouse contributed 100% of the capital, the IRD is likely to assess 100% of the interest to that spouse, absent evidence to the contrary. This position is consistent with the Board of Review decisions, such as D39/01 (2001), where the Board held that the beneficial ownership of the interest follows the beneficial ownership of the capital. For a couple where one spouse is a high earner and the other has minimal income, this creates a potential tax planning opportunity—but only if the legal ownership of the capital is genuinely shared. The IRD’s anti-avoidance provisions under Section 61A of the IRO can recharacterize any arrangement where the dominant purpose is tax avoidance. Simply depositing funds into a joint account without a corresponding change in beneficial ownership will not shift the tax liability.

The 50/50 Presumption: When Does It Apply?

A 50/50 apportionment is only acceptable to the IRD if both spouses can demonstrate equal beneficial entitlement to the capital. This is typically evidenced by:

• Equal contributions to the account from each spouse’s separate funds.
• A written agreement (e.g., a deed of trust or a joint account agreement) stating equal beneficial ownership.
• A consistent pattern of withdrawals and deposits that reflects shared control and benefit.

Without such evidence, the IRD may assess the interest in proportion to each spouse’s contribution to the capital. For the 2025/26 tax year, a couple with a joint account holding HKD 1,000,000 at 4% interest (HKD 40,000 per annum) could face a tax bill of HKD 6,000 (at the 15% standard rate) if the entire amount is assessed to the higher-earning spouse. If properly apportioned 50/50, each spouse would report HKD 20,000, potentially falling within their respective tax-free allowances (HKD 136,000 for 2025/26), resulting in zero tax.

Practical Scenarios for Hong Kong Couples

Scenario A: One Spouse Provides All Capital

This is the most common scenario. Spouse A, the higher earner, deposits HKD 500,000 into a joint account. Spouse B contributes nothing. The account earns 4% interest (HKD 20,000). The IRD will assess the HKD 20,000 entirely on Spouse A. Spouse B cannot claim any portion of the interest income, even if the account is held in joint names. The IRD’s view is that the joint name is merely for convenience (e.g., for estate planning or ease of access). The key takeaway: a joint account does not automatically create a joint tax liability.

Scenario B: Both Spouses Contribute Equally

Spouse A and Spouse B each deposit HKD 250,000 from their separate savings. The account earns HKD 20,000. The IRD will accept a 50/50 split, provided both spouses can document their respective contributions. This documentation can include bank statements showing the source of each deposit, salary slips, or a written agreement. In this scenario, each spouse reports HKD 10,000 in interest income. For the 2025/26 tax year, if both spouses have no other income, each would be below the basic allowance (HKD 136,000), and no tax would be payable.

Scenario C: Mixed Contributions with Ongoing Deposits

This is the most complex scenario. Over time, both spouses deposit varying amounts. Spouse A deposits HKD 300,000 in Year 1, Spouse B deposits HKD 200,000 in Year 2, and they make joint deposits in Year 3. The IRD will require a running calculation of the beneficial ownership of the capital. This is often impractical for the average taxpayer. The IRD’s practice note DIPN No. 44 suggests that taxpayers should maintain a clear record of contributions. In the absence of such records, the IRD may apply a default apportionment based on the most recent contributions or the initial contributions. For the 2025/26 tax year, this scenario is best handled by maintaining a simple spreadsheet tracking each spouse’s contributions and withdrawals.

Filing Requirements and Practical Steps

Form BIR60: Reporting Interest Income

Interest income from a Hong Kong savings account is reported on the “Interest” line of the BIR60 (Individual Tax Return). For a joint account, the taxpayer should report only their share of the interest, based on their beneficial entitlement. The IRD does not require a separate schedule for joint account interest, but it is advisable to attach a brief explanation if the apportionment is not 50/50. The IRD’s assessment cycle for the 2025/26 tax year will begin in April 2026, with returns due by early June 2026.

Documentation to Support Apportionment

Taxpayers should retain the following documents for at least seven years (the IRD’s standard statute of limitations):

• Bank statements showing the opening of the joint account and all deposits/withdrawals.
• A written record of each spouse’s contributions.
• Any written agreement between the spouses regarding beneficial ownership.
• Correspondence with the bank confirming the account’s terms.

For the 2025/26 tax year, the IRD’s audit cycle is shifting towards greater scrutiny of passive income, including interest, as part of its broader focus on “tax gap” analysis (IRD Annual Report 2023-24). Proper documentation is the best defense against an IRD enquiry.

The Role of the Joint Account Agreement

A formal joint account agreement, signed by both spouses, can provide strong evidence of beneficial ownership. The agreement should state:

• The proportion of capital contributed by each spouse.
• The proportion of interest income each spouse is entitled to.
• The rights of each spouse to withdraw funds.

While not legally required, this agreement can be decisive in an IRD enquiry. For Hong Kong couples, this is a low-cost, high-value document. A sample agreement can be drafted by a solicitor for a few thousand dollars.

Interaction with Other Tax Heads

Property Tax and Joint Property Ownership

For couples who own rental property jointly, the IRD’s practice is similar: the property tax (Section 5B of the IRO) is assessed on the beneficial owner of the rental income. If a property is held as joint tenants, the IRD will generally assess 50% of the rental income to each spouse, unless evidence shows otherwise. This is consistent with the treatment of joint savings accounts. For the 2025/26 tax year, a couple with a joint rental property generating HKD 240,000 per annum (after rates and deductions) would each report HKD 120,000, potentially falling within their respective allowances.

Salaries Tax and the Married Persons Allowance

The Married Persons Allowance (MPA) for the 2025/26 tax year is HKD 264,000 (combined with the basic allowance of HKD 136,000 per person). If one spouse has no income, the other spouse can claim the MPA, effectively doubling their allowance. However, if the non-working spouse has interest income from a joint account, this income is still assessable on them, potentially reducing the benefit of the MPA. For a couple where one spouse is a high earner (e.g., HKD 1,200,000 per annum) and the other has HKD 40,000 in interest income, the MPA is still available, but the interest income is taxed at the non-working spouse’s marginal rate (which, if they have no other income, is 2% on the first HKD 50,000 under the 2025/26 progressive rates).

Profits Tax and Self-Employed Couples

For self-employed couples (e.g., a husband-and-wife partnership), the treatment of interest income from a joint business account follows the same beneficial ownership principle. If the partnership agreement states that profits are split 70/30, the interest income on the partnership’s bank account should be split accordingly. The IRD will cross-reference the partnership return (Form BIR51/52) with the individual returns. For the 2025/26 tax year, a couple running a small trading business with HKD 100,000 in interest income should ensure their partnership agreement reflects the beneficial ownership of the capital, not just the profits.

Actionable Takeaways

• For the 2025/26 tax year, maintain a written record of each spouse’s contributions to any joint savings account, as the IRD does not presume a 50/50 split absent evidence of equal beneficial ownership.
• If one spouse provides all the capital, the interest income is assessable solely on that spouse, regardless of the joint account name—plan accordingly to avoid an unexpected tax bill.
• For couples with equal contributions, a simple spreadsheet tracking deposits and a signed joint account agreement will support a 50/50 apportionment in an IRD enquiry.
• Interest income below HKD 136,000 per spouse (the 2025/26 basic allowance) is tax-free, but the IRD still requires it to be reported on the BIR60.
• Review the interaction with the Married Persons Allowance: a non-working spouse’s interest income is taxable at their own progressive rate, not the high earner’s rate.

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