Hong Kong–Mainland Tax Residency Conflict: Double Taxation Risk

Introduction

In recent years, the number of Mainland residents relocating to Hong Kong through channels such as the Top Talent Pass Scheme (TTPS), the Quality Migrant Admission Scheme (QMAS) and the New Capital Investment Entrant Scheme (New CIES) has continued to climb. Figures from the Immigration Department show that in 2024 alone, various talent admission schemes granted over 100,000 visa applications. Many applicants, having obtained Hong Kong residency, promptly make arrangements to buy property, run businesses or manage assets in Hong Kong, and naturally assume that becoming a Hong Kong tax resident alone will allow them to break free entirely from the Mainland tax net. However, the Mainland and Hong Kong each have their own complete mechanisms for determining tax residency, and the two are not mutually exclusive. In practice, a large number of migrants, having failed to properly deal with their Mainland household registration (hukou), property and economic interest connections, end up falling under both jurisdictions’ definitions of “tax resident”, triggering the significant risk that their worldwide income is taxed by both places. This article examines the determination criteria of the two jurisdictions, the core scenarios of dual-resident conflict, and the tie-breaker rule and resolution mechanisms provided by the Mainland and Hong Kong Special Administrative Region Arrangement for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion on Income (hereinafter the “Arrangement”), to help cross-border families plan early.

Hong Kong’s Criteria for Determining Tax Residency

The Inland Revenue Department (IRD) adopts two criteria — “ordinary residence” and “number of days of stay” — to determine an individual’s tax residency. Under the Inland Revenue Ordinance (Cap. 112) and the IRD’s interpretation of comprehensive double taxation avoidance agreements/arrangements, an individual is regarded as a Hong Kong tax resident if any of the following conditions is met: (1) ordinarily resident in Hong Kong; or (2) staying in Hong Kong for more than 180 days in the relevant year of assessment, or staying in Hong Kong for more than 300 days in two consecutive years of assessment (one of which is the relevant year of assessment). When assessing “ordinary residence”, the IRD examines together objective facts such as the location of the taxpayer’s family members, principal place of business, and social and cultural ties, before making a comprehensive determination. This determination directly affects whether the taxpayer can claim treaty benefits on cross-border income.

Any taxpayer who needs to prove their Hong Kong tax residency to an overseas or Mainland tax authority must submit Form IR1310A (for individuals) to the IRD to apply for a Certificate of Hong Kong Resident Status (IRD Certificate of Resident Status page). The certificate sets out the residency criteria the applicant meets and the applicable arrangement provisions, and is a key document in cross-border tax planning. It should be noted that holding the certificate is only prima facie evidence of Hong Kong tax residency; the treaty partner (including the Mainland) may still conduct a substantive review.

Determining Mainland Tax Residency: Domicile, 183 Days and Centre of Economic Interests

Article 1 of the Individual Income Tax Law of the People’s Republic of China (State Taxation Administration full-text regulations) divides individuals into “resident individuals” and “non-resident individuals”. Resident individuals comprise two categories: (1) individuals who have a domicile within the territory of China; and (2) individuals without a domicile who reside within the territory of China for an aggregate of 183 days or more within a tax year. The “domicile” in this provision does not refer to owning one’s own property, but to “habitual residence” within the territory of China by reason of household registration (hukou), family or economic interest relations. Article 2 of the Implementing Regulations of the Individual Income Tax Law of the People’s Republic of China further clarifies that habitual residence is the sole criterion for determining domicile; even if the individual resides outside the country for reasons such as study, work or visiting relatives, so long as the above connections are not severed, they are still regarded as a domiciled resident.

For those who have moved to Hong Kong but retain their Mainland household registration, whose spouse and children continue to live in the Mainland, or whose principal source of income and assets are concentrated in the Mainland, Mainland tax authorities are highly inclined to classify them as domiciled resident taxpayers, and their worldwide income — including Hong Kong employment income, property rental, directors’ fees, asset appreciation and the like — is all subject to Mainland tax law. For individuals without a domicile, if they stay in the Mainland for an aggregate of more than 183 days within the year, they are likewise classified as resident taxpayers and must pay tax on income from both within and outside the Mainland, enjoying a five-year relief period only under certain transitional rules. For the 2023 tax year, the top applicable rate on comprehensive income of Mainland resident individuals reached 45%, and since 2019 the reporting of resident individuals’ overseas income has been brought fully into the monitoring system, sharply increasing compliance pressure.

Scenarios of Dual Tax Resident Conflict

The trap most often fallen into by cross-border migrants is that, within the same year of assessment, they meet Hong Kong’s “ordinary residence” or “number of days of stay” threshold while also satisfying the Mainland’s definition of a resident by retaining Mainland household registration or residing for 183 days or more, causing both jurisdictions to assert worldwide taxing rights over them. A typical example: a Hongkonger who has moved from the Mainland and holds a Hong Kong Identity Card (HKID) resided in Hong Kong for about 200 days and in the Mainland for 165 days in 2024, has not cancelled their Mainland household registration, has a spouse working in the Mainland, two children studying in the Mainland, and still owns a self-occupied property in the Mainland under their name. Hong Kong regards them as a Hong Kong tax resident on the grounds of ordinary residence and stay exceeding 180 days; the Mainland, by reason of their household registration, family and principal economic interests being in the Mainland, classifies them as a domiciled resident. The individual’s Hong Kong employment income, share-trading gains, offshore interest and the like in that same tax year must be declared in both Hong Kong and the Mainland; even though Hong Kong does not tax offshore income or capital gains, the Mainland may still tax such income, creating substantive double taxation.

Another high-risk combination is “no Mainland domicile but residing for 183 days or more”. Some migrants have cancelled their Mainland household registration, but if, owing to frequent business travel or family visits, they stay in the Mainland for more than 183 days within a calendar year, they become a Mainland tax resident and must pay Mainland tax on their worldwide income. If in the same year they also meet Hong Kong’s residency criteria, the dual-status conflict arises immediately. Practical data shows that in recent years the number of cross-boundary commuting families in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA) has risen sharply, and cases of crossing the boundary more than twice a week on average have intensified this type of conflict.

The Arrangement’s Coordination Mechanism: The Tie-breaker Rule and Elimination of Double Taxation

The Arrangement signed by the Mainland and Hong Kong on 21 August 2006 (State Taxation Administration full text of the Arrangement), its Article 4 “Resident”, provides a “tie-breaker rule” decisive mechanism for dual-resident cases. When an individual is a resident of both sides, their residency in a single side must be determined strictly in the following sequential order: (1) resident of the side where their permanent home is situated; if they have a permanent home in both or neither side, then (2) the side of their centre of vital interests (that is, the side with which the individual’s personal and economic relations are closer); (3) if the centre of vital interests cannot be determined, the side of their habitual abode; (4) if still unable to determine, the side of their nationality (the place to which their held passport or identity card belongs); and finally (5) resolution through consultation between the competent authorities of the two sides.

Article 22 of the Arrangement also provides a mechanism for eliminating double taxation: tax paid by a resident individual in Hong Kong may be credited against the tax payable in the Mainland on the same income. It must be emphasised, however, that when applying the tie-breaker rule, Mainland tax authorities adopt the principle of “substance over form”; although the Certificate of Hong Kong Resident Status issued by the IRD is an important reference, it is not absolutely binding; the Mainland may raise objections to “permanent home” and “centre of vital interests” and re-determine the place of residence, in which case the taxpayer must bear the burden of proof.

Practical Risks and Compliance Resolution Paths

Dual tax residency brings not only repeated taxation of the same income, but also onerous filing obligations and the risk of surcharges and penalties. The Law on the Administration of Tax Collection of the Mainland provides that for a resident individual’s failure to declare or omission of overseas income, a fine of 0.5 times to 5 times the underpaid tax may be imposed, together with a daily late-payment surcharge of 5/10,000; serious cases may involve criminal liability. Hong Kong’s Inland Revenue Ordinance, section 82, imposes a maximum imprisonment of three years for those who wilfully evade tax.

Migrant families can plan along the following dimensions to reduce risk:

• Day-count control: Calculate precisely the number of days spent in each place in each year of assessment, avoiding staying in the Mainland for more than 183 days in a single year, especially for those who have cancelled their household registration, who can thereby shed resident taxpayer status. However, for those who retain household registration, controlling days alone is insufficient; household registration and economic connections must be dealt with in parallel.
• Severing economic connections: Sell the principal self-occupied Mainland property, terminate Mainland employment relationships, and move the spouse and children to Hong Kong for reunion, gradually shifting the centre of interests to Hong Kong. Throughout the process, retain all supporting documents (property sale and purchase agreements, utility disconnection records, school withdrawal certificates, etc.) for inspection.
• Initiating the mutual agreement procedure: When encountering double taxation, an application for consultation may be made to the IRD or the Mainland tax authority under the Arrangement, and the two authorities will determine the single place of residence under Article 4. Although the process takes longer, it can fundamentally resolve the residency conflict.
• Applying for a Certificate of Resident Status in advance: Before cross-border payments of dividends, interest or royalties, obtain the IR1310A certificate early to show the payer or the Mainland tax authority that the treaty rate applies, avoiding disputes at the point of withholding tax.
• Professional cross-border tax structuring: Engage a tax adviser with credentials in both jurisdictions to assess the asset-holding structure and consider lawful vehicles such as family trusts, insurance structures or offshore companies to compliantly reduce the overall tax burden. At the same time, keep abreast of the 2025 new rules on Mainland tax residents’ overseas income supervision to ensure proactive declaration.

Conclusion

Relocating to Hong Kong is by no means a once-and-for-all solution to tax burden. The tax status of cross-border families is like walking a tightrope — a slight tilt and one falls into the mire of dual residency. The conflict between the Mainland and Hong Kong over tax residency determination stems from the intersection of the independent sovereignty of the two jurisdictions’ laws and their substantive economic connections. Only by thoroughly mastering core rules such as “domicile”, “centre of vital interests” and “183 days”, making good use of the Arrangement’s tie-breaker criteria and consultation mechanism, and consistently managing days of residence and economic bases, can one enjoy Hong Kong’s low-tax environment while avoiding the inadvertent triggering of a cross-border tax storm. This article is for information reference only and does not constitute legal advice; readers should consult a professional cross-border tax adviser regarding their own circumstances.