Briefing: treaty access between Hong Kong Cayman

The Cayman Islands has no income tax treaty network, which means a holding structure that routes income through a Cayman entity towards a Hong Kong operating company cannot claim treaty relief directly. The operative question – one that recurs every time a distribution, royalty or interest payment crosses the corridor – is whether Hong Kong's treaty network can be accessed legitimately at the Hong Kong layer, and whether the substance conditions attached to that access are met.

What the development is and why it matters now

The trigger here is not a single legislative change with a single effective date. It is a pattern of tightening scrutiny that has accumulated across several years and now bears directly on Cayman-over-Hong Kong structures at every review cycle.

Hong Kong operates a territorial tax system. Under the Inland Revenue Ordinance (Hong Kong's principal tax statute), only profits that arise in or derive from Hong Kong are chargeable. That territorial basis is what makes Hong Kong attractive as a holding and treaty-access layer above a Cayman vehicle. But the foreign-sourced income exemption (FSIE) regime – in force from 1 January 2023 and since amended – imposes economic-substance conditions on passive income (dividends, interest, royalties, gains on disposal of equity interests) received in Hong Kong by a multinational group entity. Passive income that does not meet those conditions is brought into charge in Hong Kong, removing the expected exemption.

Simultaneously, the global Pillar Two minimum tax framework – under which Hong Kong's domestic minimum top-up tax and income-inclusion rule apply to in-scope groups for fiscal years beginning on or after 1 January 2025 – changes the effective tax cost calculation for structures where the Cayman layer produces a low or zero effective rate. Groups with consolidated revenue at or above EUR 750 million are in scope. For those groups, a Cayman holding layer with no local substance and no tax may now generate a top-up charge elsewhere in the group.

These two developments interact directly with treaty access. If the Hong Kong entity lacks the substance to be the true beneficiary of an income stream – and therefore lacks the substance to claim Hong Kong's treaty position – then neither the FSIE exemption nor the treaty relief operates as intended.

Who is affected across the Hong Kong – Cayman corridor

Any group that uses a Cayman entity above a Hong Kong opco (operating company) or holds investments through a Cayman fund-level vehicle with Hong Kong portfolio companies should review its position. The practical risk sits at the Hong Kong entity: does it have adequate substance to be the beneficial owner of the income it receives, and does it perform the economic activity that substantiates its treaty position?

The concern is not hypothetical. In our cross-border practice, we see structures where a Hong Kong intermediate holdco was inserted primarily for treaty access, with minimal staff, no local decision-making, and no genuine commercial function. That configuration is precisely the fact pattern that attracts scrutiny under the FSIE substance conditions and under the principal purposes test (a general anti-avoidance rule embedded in Hong Kong's treaties with many counterpart jurisdictions).

Groups that are not in scope for Pillar Two are not insulated. The FSIE regime applies regardless of group size where the entity is a member of a multinational group receiving passive income in Hong Kong. Parties should verify the current perimeter before acting.

The immediate action

The sequence for any group operating a Cayman-over-Hong Kong structure is the same whether the review is prompted by a filing deadline, a transaction, or an internal audit.

First, map each income stream that crosses the corridor. Identify whether each payment is passive income under the FSIE regime and whether it relies, explicitly or implicitly, on a Hong Kong treaty position.

Second, assess substance at the Hong Kong layer. The Inland Revenue Ordinance and the IRD's published guidance on the FSIE regime set out the relevant substance conditions. Substance means real economic activity: local personnel with genuine authority, local decision-making, and local assets commensurate with the function. A registered office and a nominee director do not suffice.

Third, consider the Pillar Two exposure if the group is in scope. The Cayman layer's effective tax rate feeds into the global anti-base-erosion calculation; groups with zero-tax Cayman vehicles may face top-up charges in other group jurisdictions even if Hong Kong's own position is sound.

We regularly advise international groups on the substance and treaty-access position of Hong Kong intermediate entities, working alongside locally licensed firms on Hong Kong-law elements. For a structured assessment of your Cayman–Hong Kong structure and the filing position it creates, write to us at info@lockhartyip.com.

Related practices

Tax Positions – source, substance and treaty analysis for cross-border groups in Hong Kong
Holding Structures – reviewing and restructuring holding layers across Hong Kong and offshore centres

Frequently asked questions

What are the main risks in treaty access between Hong Kong and the Cayman Islands?

The principal risk is that the Hong Kong entity through which treaty access is claimed lacks sufficient economic substance to be treated as the beneficial owner of the income. Where that is the case, the FSIE exemption may not apply, the treaty position may be denied under the principal purposes test, and a tax charge arises in Hong Kong. A secondary risk for larger groups is a Pillar Two top-up charge triggered by the Cayman layer's low or zero effective tax rate. Both risks require a substance review at the Hong Kong layer before any distribution or filing.

What documents are needed for treaty access between Hong Kong and the Cayman Islands?

Treaty access claims rely on demonstrating that the Hong Kong entity is a Hong Kong tax resident and the beneficial owner of the income. The practical file should include: a certificate of residence issued by the Inland Revenue Department, evidence of local substance (board resolutions made in Hong Kong, records of local personnel and their authority, local office arrangements), and documentation of the commercial rationale for the structure. For FSIE purposes, the IRD may also require evidence of the specific economic activity performed in Hong Kong. Parties should verify current IRD guidance before preparing the file.

What does the route look like for treaty access between Hong Kong and the Cayman Islands?

Because the Cayman Islands has no treaty network of its own, treaty access must be obtained at the Hong Kong layer. The route runs from the payer jurisdiction through its applicable treaty with Hong Kong, with the Hong Kong entity claiming relief as resident and beneficial owner. The Cayman entity above the Hong Kong layer is treaty-transparent only if the structure is designed and substantiated correctly. Each income stream – dividend, interest, royalty – must be analysed separately, as the substance conditions under the FSIE regime differ across income categories. See also our related analysis at tax review before a Cayman Islands exit or distribution and our further analysis on the same corridor.

Speak with Lockhart & Yip

For a scoped view of your matter, contact info@lockhartyip.com. Discuss your matter →

This publication is general information and does not constitute legal advice. For advice on your situation, contact info@lockhartyip.com.

Briefing: treaty access between Hong Kong and the Cayman Islands

What the development is and why it matters now

Who is affected across the Hong Kong – Cayman corridor

The immediate action

Frequently asked questions

Speak with Lockhart & Yip

Related