Marriage and Tax: A Newlywed's Guide to Combining Allowances

The 2025-26 Budget, delivered by Financial Secretary Paul Chan on 26 February 2025, confirmed no changes to the standard tax rates or the progressive marginal tax bands for salaries tax for the year of assessment 2025/26. However, the Budget did not address a structural inefficiency that has persisted for years: the marriage penalty embedded in Hong Kong’s Inland Revenue Ordinance (Cap. 112). For a newly married couple, the decision to file jointly under “personal assessment” or separately under individual assessment is not a mere administrative formality. It is a tactical choice that can shift thousands of dollars in tax liability depending on the income split, property ownership, and the availability of specific allowances. With the 2025/26 tax return filing season (BIR Form 60 for newly registered taxpayers) opening in April 2025, couples who married in 2024 or early 2025 face their first joint filing decision. This guide provides a structured analysis of how to combine allowances, elect for personal assessment, and avoid common pitfalls that erode the benefits of marriage under Hong Kong’s territorial tax system.

The Mechanics of Joint Assessment vs. Separate Assessment

The first operational decision a married couple must make is whether to elect for joint assessment under personal assessment or to file separate tax returns. The default position under the Inland Revenue Ordinance (IRO) is that each individual is assessed separately on their own income. However, Section 41 of the IRO permits a married couple who are both resident in Hong Kong to elect for personal assessment, which aggregates their total income from all sources (salaries, profits, and property) and then applies the progressive tax rates to the combined assessable income. This election is particularly advantageous when one spouse has significantly less income than the other, as it allows the lower earner’s unused allowances and marginal tax bands to be transferred to the higher earner.

The Progressive Rate Structure and the Tax Bands

For the year of assessment 2024/25 (the return due in 2025), the standard tax rate remains at 15% of net chargeable income, but the progressive tax rates apply as follows:

• First HKD 50,000 at 2%
• Next HKD 50,000 at 6%
• Next HKD 50,000 at 10%
• Next HKD 50,000 at 14%
• Remaining at 17%

A single individual with no dependents receives a basic allowance of HKD 132,000 for 2024/25. If that individual earns HKD 500,000, the tax liability before allowances is calculated on HKD 368,000 (HKD 500,000 minus HKD 132,000). Under progressive rates, this yields approximately HKD 38,460. If that individual marries a spouse with zero income, the couple can elect for personal assessment. The combined basic allowance becomes HKD 264,000 (two individual allowances). The combined net chargeable income is HKD 236,000 (HKD 500,000 minus HKD 264,000). The tax on HKD 236,000 under progressive rates is approximately HKD 14,820 — a saving of HKD 23,640. This is the core marriage benefit.

The Marriage Allowance and Its Interaction with the Basic Allowance

Section 28 of the IRO provides a specific “married person’s allowance” of HKD 264,000 for the year of assessment 2024/25. This is not an additional allowance; it is simply the sum of two basic allowances. Critically, this allowance is only available if the couple elects for joint assessment under personal assessment. If they file separately, each spouse claims their own basic allowance of HKD 132,000. The married person’s allowance is not a bonus; it is a consolidation. The real benefit arises from the ability to use the lower earner’s unused allowances to reduce the higher earner’s tax liability.

The Trap of the Standard Rate Ceiling

A common oversight occurs when the higher earner’s income is substantial enough that the tax under the progressive rate exceeds the tax at the standard rate of 15% on net chargeable income. Under Section 5 of the IRO, the tax payable is the lower of the progressive tax calculation and the standard rate calculation. For a high-income earner (e.g., HKD 2 million in assessable income), the standard rate calculation often produces a lower tax bill. In such cases, joint assessment under personal assessment may not yield a benefit because the allowances are only applied in the progressive rate calculation. If the standard rate applies, the allowances are effectively irrelevant. A couple must model both calculations to determine which election is optimal.

Allowances That Can Be Transferred Between Spouses

Beyond the basic allowance, several other allowances can be transferred from the lower-earning spouse to the higher-earning spouse under personal assessment. The IRO does not permit the transfer of allowances in separate assessment; they must be claimed by the individual who qualifies. Under joint assessment, however, the combined allowances are applied to the aggregate income.

Dependent Parent and Grandparent Allowance

Section 30 of the IRO provides a dependent parent allowance of HKD 25,000 per parent (or HKD 50,000 if the parent is aged 60 or above) and an additional HKD 25,000 if the parent resides with the taxpayer. If one spouse supports their own parents, that allowance is typically claimed by that spouse. Under joint assessment, if the supporting spouse has insufficient income to use the full allowance, the unused portion can be applied against the other spouse’s income. For example, if Spouse A supports two parents aged 70 and 68, the total allowance is HKD 100,000 (HKD 50,000 each). If Spouse A earns HKD 80,000, only HKD 80,000 of the allowance is used. Under separate assessment, the remaining HKD 20,000 is lost. Under joint assessment, it offsets Spouse B’s income.

Single Parent Allowance and Child Allowance

A single parent allowance of HKD 132,000 is available under Section 32 of the IRO for a taxpayer who has sole or predominant care of a child. Upon marriage, if the child is adopted by both spouses, the single parent allowance ceases to be available. Instead, the couple may claim a child allowance of HKD 130,000 per child for the first to ninth child. This allowance can be claimed by either spouse or split between them, but under joint assessment, the full allowance is applied to the aggregate income. The loss of the single parent allowance upon marriage is a specific trap that can increase tax liability by HKD 132,000 in assessable income, which at the 17% marginal rate equals HKD 22,440 in additional tax. Couples should model this transition carefully.

Disabled Dependent Allowance

A disabled dependent allowance of HKD 75,000 per dependent is available under Section 31 of the IRO. This allowance is transferable between spouses under joint assessment. If one spouse cares for a disabled parent or sibling, the allowance can be applied against the other spouse’s income if the caring spouse has insufficient income.

Property Tax and Profits Tax Considerations for Married Couples

Marriage often involves the consolidation of property holdings and business interests. The interaction between property tax, profits tax, and salaries tax under personal assessment becomes a critical planning point.

Rental Income from Jointly Owned Property

Under Section 5B of the IRO, property tax is charged at a standard rate of 15% on the net assessable value of the property (after deduction of rates and a 20% statutory allowance for repairs and outgoings). If a married couple owns a property jointly as tenants in common, each spouse is assessed separately on their share of the rental income. This separate assessment is usually disadvantageous because each spouse’s property tax is calculated at 15% with no allowance for progressive rates or personal allowances. By electing for personal assessment, the couple can aggregate the rental income with their salaries and profits, then apply the progressive rate structure. If one spouse has low overall income, the rental income can be taxed at the lower 2%, 6%, or 10% bands instead of the flat 15%.

Sole Proprietorship and Partnership Profits

A married couple who operate a business as a sole proprietorship or partnership face a similar choice. Under Section 14 of the IRO, profits tax is charged at a flat rate of 16.5% on assessable profits (8.25% on the first HKD 2 million of profits for unincorporated businesses). Under separate assessment, each spouse is taxed on their share of the profits at the profits tax rate. Under personal assessment, the profits are aggregated with other income and taxed at progressive rates. For a business with modest profits (e.g., HKD 500,000), the progressive rate on the combined income may be lower than the 16.5% profits tax rate. However, the election for personal assessment is irrevocable for the year of assessment once made, and it applies to all income of the couple. A couple cannot selectively apply personal assessment to only the rental income or only the business income.

The Loss of the Concessionary Profits Tax Rate

A specific trap exists for businesses with profits below HKD 2 million. Under the two-tiered profits tax regime introduced in 2018, the first HKD 2 million of profits for an unincorporated business is taxed at 8.25%. Under personal assessment, this concessionary rate is lost. The entire profit is aggregated with salaries and rental income and taxed at the progressive rates, which may be higher than 8.25% for a high-income couple. For example, if a sole proprietor earns HKD 1.8 million in business profits and HKD 500,000 in salary, the combined income of HKD 2.3 million under personal assessment would be taxed at the 17% marginal rate on the portion above HKD 200,000 (after allowances). The effective tax rate on the business profits would be approximately 15-17%, compared to 8.25% under the profits tax regime. In this scenario, separate assessment for the business and joint assessment for salaries and property may be preferable, but this requires careful modeling.

Electing for Personal Assessment: Procedure and Pitfalls

The election for personal assessment is made by ticking the relevant box on the tax return (BIR Form 60 for new taxpayers or BIR Form 61 for existing taxpayers). The election must be made jointly by both spouses. Once made, it applies to all income of both spouses for that year of assessment.

The Time Limit for Election

Under Section 41 of the IRO, the election must be made in writing within the time specified in the notice of assessment. In practice, this means the election must be made on or before the filing deadline of the tax return. For a newly married couple, the first joint return is due on the same date as the individual return — typically 2 May for the year of assessment (e.g., 2 May 2025 for the 2024/25 return). Late elections are not accepted. If a couple misses the deadline, they must file separately and cannot retrospectively elect for personal assessment.

The Irrevocability of the Election

Once the election is made and the assessment is finalized, the couple cannot revert to separate assessment for that year. This is a binding decision. If the couple later divorces or separates, they must file separately for subsequent years, but the election for the married year stands. The Inland Revenue Department (IRD) will not allow a retrospective revocation.

The Statute of Limitations for Objection

If a couple believes the IRD has incorrectly applied the personal assessment or missed an allowance, they must object within one month of the date of the notice of assessment under Section 64 of the IRO. The IRD may extend this period in exceptional circumstances, but it is not guaranteed. Newly married couples should review their assessment notices immediately upon receipt and file an objection promptly if errors are identified.

Actionable Takeaways

1. Model both scenarios before filing: Run a side-by-side calculation of tax liability under separate assessment (each spouse filing individually with basic allowances) and joint assessment under personal assessment (aggregated income with married person’s allowance) for the 2024/25 year of assessment before ticking the election box on BIR Form 60.

2. Do not elect personal assessment if the standard rate ceiling applies to either spouse: If either spouse’s income exceeds approximately HKD 1.2 million (the point at which the standard rate of 15% becomes cheaper than the progressive rate), joint assessment may produce a higher tax bill because allowances are not applied in the standard rate calculation.

3. Transfer unused dependent parent allowances by electing joint assessment: If one spouse supports parents but has low income, the unused allowance (up to HKD 100,000 per couple for two parents) can be transferred to the higher-earning spouse only under joint assessment.

4. Beware the loss of the single parent allowance upon marriage: If one spouse previously claimed the HKD 132,000 single parent allowance, marriage eliminates this allowance entirely; model the impact on tax liability, which can increase by up to HKD 22,440 at the 17% marginal rate.

5. Separate business profits from salaries if the two-tiered profits tax rate applies: If a sole proprietor’s business profits are below HKD 2 million and taxed at 8.25%, do not elect personal assessment unless the combined income from all sources is low enough that the progressive rate stays below 8.25% on the business portion.

Disclaimer: 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.