Where Pillar Two and the Hong Kong minimum top-up tax for a large group stands now

The Hong Kong minimum top-up tax, enacted as part of the jurisdiction's implementation of the OECD's Pillar Two global minimum tax, applies to in-scope multinational enterprise groups for fiscal years beginning on or after 1 January 2025. The qualifying threshold is consolidated group revenue of EUR 750 million or above. For a large group with operating entities or holding structures routed through Hong Kong, the question is no longer whether this regime applies – it is where the exposure sits within the existing structure, and how the territorial system interacts with the top-up mechanism.

This analysis maps the current position, identifies where the real commercial risk concentrates, and offers our read on the issues most commonly missed by groups that have run only a headline-rate comparison.

What is actually at stake commercially for an in-scope group?

The headline narrative on Pillar Two is about rates. The commercial reality is about source, substance and the allocation of residual top-up liability across a structure that was never designed with a 15% floor in mind.

Hong Kong operates a territorial profits tax system. Corporations pay tax on Hong Kong-sourced profits only. The two-tier rate sits at 8.25% on the first HK$2,000,000 of assessable profits and 16.5% above that threshold. For a group entity that earns primarily from Hong Kong-sourced activity, the effective rate commonly exceeds 15%. No top-up arises in that scenario.

The exposure appears when a Hong Kong entity earns income that is, under Hong Kong's territorial rules, treated as non-Hong Kong-sourced and therefore not subject to profits tax locally. Under the foreign-sourced income exemption regime – the FSIE rules in force from 1 January 2023 as amended – certain categories of passive income received by Hong Kong-resident entities from offshore are conditionally exempt. That exemption is economically rational under the territorial system. Under Pillar Two, however, the same income may produce a low effective tax rate at the jurisdictional level, triggering a top-up charge either locally or upstream.

This is the core commercial stake: a group that structured its Hong Kong entities around the territorial exemption for offshore income now faces a calculation in which that exemption creates, rather than resolves, a Pillar Two exposure. The legal answer and the tax answer run in opposite directions.

How does the governing instrument work, and where does the cross-border interface bite?

Hong Kong's minimum top-up tax operates under the Inland Revenue Ordinance, as amended to incorporate both a qualified domestic minimum top-up tax (QDMTT) and an income inclusion rule (IIR). The IIR is the mechanism by which a parent entity in Hong Kong charges a top-up tax on the low-taxed income of its constituent subsidiaries elsewhere. The QDMTT is the local self-charge: it allows Hong Kong to collect the top-up on Hong Kong entities before another jurisdiction does so under their own IIR.

The cross-border interface bites in two directions simultaneously.

First, where a Hong Kong ultimate parent holds subsidiaries in jurisdictions that have also enacted a QDMTT, those subsidiaries self-charge before the IIR at the Hong Kong level applies. The group must therefore track the effective rate at every constituent entity level, in every jurisdiction, and determine whether a local QDMTT absorbs the liability or whether the IIR cascades upward to Hong Kong. This is a data and governance problem as much as it is a legal one.

Second, where a group's ultimate parent sits outside Hong Kong – a common pattern for Asian conglomerates that hold a Hong Kong opco beneath a BVI or Cayman intermediate, itself owned by a Mainland or European parent – the IIR in the parent jurisdiction may reach down to the Hong Kong entity. A Hong Kong QDMTT, if validly enacted and in force, protects against that reach. Without it, the top-up is collected elsewhere. The commercial difference is not in the amount: it is in who collects it and under whose compliance and dispute-resolution regime the group sits.

The Mainland China position is a distinct cross-border thread. The Mainland has its own Pillar Two implementation timeline, and large groups with both Mainland and Hong Kong entities must model the interaction between two separate enactments, two separate competent authorities, and the existing Arrangement for the Avoidance of Double Taxation between the Mainland and Hong Kong. Our cross-border tax practice sees groups that have modelled one side of this interface and left the other entirely unaddressed.

What does the comparative read across the FSIE regime and Pillar Two actually look like?

The FSIE regime and the Pillar Two minimum tax are conceptually aligned – both are responses to OECD pressure – but their mechanics diverge at precisely the points that matter most for a holding group.

Under the FSIE rules, the four covered categories of passive income – dividends, interest, royalties and gains on disposal of equity interests – are subject to profits tax in Hong Kong if received by a Hong Kong-resident entity and the entity does not meet the relevant economic-substance requirement. The regime is satisfied by demonstrating substance in Hong Kong: adequate employees, expenditure, decision-making presence. Substance that satisfies the FSIE test does not, however, automatically produce an effective tax rate above 15% for Pillar Two purposes. The substance test and the rate test operate independently.

Consider the scenario in which a Hong Kong holding entity holds an operating subsidiary in a low-tax jurisdiction. The Hong Kong entity satisfies the FSIE substance test and the dividend received from the subsidiary is charged to Hong Kong profits tax at 16.5%. So far, no Pillar Two issue for the Hong Kong entity. But the subsidiary itself may be a low-taxed constituent entity – and the IIR at the Hong Kong parent level must still calculate the effective rate of that subsidiary. The FSIE compliance at the Hong Kong level does not cure the low-tax position at the subsidiary level. The IIR reach runs through the structure.

This is the analysis most frequently missing from early Pillar Two reviews. Groups that completed an FSIE substance review in 2023 and satisfied the IRD on the Hong Kong side have sometimes treated that as a Pillar Two clearance. It is not. The two regimes address different questions.

For groups using a Cyprus–Hong Kong holding route, a further layer arises. Cyprus has its own Pillar Two QDMTT and IIR enactment. Where a Cyprus intermediate holds a Hong Kong entity that itself holds low-tax subsidiaries, the IIR may apply at the Cyprus level before it reaches a Hong Kong ultimate parent. The group must trace the top-down IIR priority rules through the full chain to determine where the top-up is actually collected.

Where does the risk actually sit for a group structured through Hong Kong?

In our cross-border tax practice, the risk concentrates at three points.

Point one: jurisdictional effective-rate miscalculation. The Pillar Two effective rate is calculated on a jurisdictional basis, not an entity basis. A group with multiple Hong Kong entities must aggregate their positions. A highly taxed entity and a low-taxed entity in the same jurisdiction blend their rates. Where blending produces an aggregate rate above 15%, no top-up arises. Where it does not, the shortfall is charged. Groups that have modelled entity by entity, rather than jurisdiction by jurisdiction, often discover a blended rate below 15% that entity-level analysis missed.

Point two: substance as a rate driver, not only a compliance driver. The OECD's substance-based income exclusion (SBIE) carves out a portion of covered income from the top-up calculation based on payroll and tangible asset values in the jurisdiction. A group with genuine Hong Kong payroll and fixed assets – not merely a holding entity on a register – qualifies for a meaningful SBIE. This reduces the income exposed to the top-up calculation. We regularly advise groups that have never quantified their SBIE position for the Hong Kong entities, and the carve-out is, in several cases, material.

Point three: GloBE information return timing. The Pillar Two regime requires a GloBE information return – the consolidated cross-border compliance filing – to be submitted within a defined period after the fiscal year-end. First-year filing deadlines under the transitional rules deserve careful attention. A group that is in-scope from its first fiscal year beginning on or after 1 January 2025 must have its data aggregation, entity mapping and jurisdictional effective-rate calculation in place well before the first return falls due. The window for retrospective correction is narrower than groups expect.

The sequence above describes the standard position under the enacted rules. Your group's specific structure, the jurisdictions of your constituent entities, and the interplay between your FSIE position and the Pillar Two calculation all determine where the exposure actually lands – and that is where the route through is won or lost.

To discuss the Pillar Two and FSIE position for your cross-border structure, write to us at info@lockhartyip.com.

How does a Mainland-headquartered group with Hong Kong entities approach this?

For a group with a Mainland China ultimate parent or intermediate, the Pillar Two analysis runs across two legal systems simultaneously. The Mainland's enterprise income tax regime, the applicable withholding tax on dividends flowing from a Hong Kong entity, and the Mainland's own Pillar Two implementation all interact with the Hong Kong QDMTT and IIR.

The critical sequencing question is: does the Mainland parent's IIR apply to the Hong Kong entity's income before or after the Hong Kong QDMTT discharges the liability? A valid QDMTT in the Hong Kong entity's jurisdiction protects against the parent's IIR. But "valid" carries a specific technical meaning under the OECD's agreed administrative guidance: the QDMTT must be computed in a manner consistent with the GloBE rules, not merely a domestically computed tax that produces a similar number. Groups should verify that the Hong Kong QDMTT as enacted satisfies this condition – and should do so before the first fiscal year falls due, not after.

We have acted on treaty-access matters between the Mainland and Hong Kong that raise structurally similar questions about how two overlapping regimes allocate taxing rights – the CIS–Hong Kong treaty matter illustrates how the cross-border interface between two concurrent regimes can produce unexpected outcomes. Pillar Two adds a third layer to that interface.

For Mainland groups, the practical focus should be on three items: mapping the IIR priority between the Mainland and Hong Kong; verifying the QDMTT validity for the Hong Kong entities; and ensuring that the GloBE information return is coordinated across both competent authorities. These are not tasks that can be delegated to local compliance teams working in isolation on each side of the boundary.

What do groups structured through BVI or Cayman intermediates need to consider?

The BVI and Cayman Islands are common-law jurisdictions widely used as intermediate holding centres above a Hong Kong operating or sub-holding entity. Under Pillar Two, neither jurisdiction has enacted a QDMTT that would protect constituent entities resident there from another jurisdiction's IIR. The consequence is straightforward in principle but operationally significant: the IIR at the ultimate parent's jurisdiction reaches through the BVI or Cayman intermediate to assess the effective rate of the underlying Hong Kong and other entities.

This does not inherently produce a top-up liability. If the Hong Kong entity's effective rate is above 15% on its covered income, the IIR calculation at the parent level finds no shortfall. But the BVI or Cayman entity itself – if it earns any covered income – is a low-taxed constituent entity almost by definition, because neither jurisdiction imposes corporate income tax. A BVI intermediate that earns interest, royalties or management fees creates a Pillar Two exposure at the top of the structure.

The response is not necessarily to collapse the intermediate. Groups may restructure the income flows, ensure that covered income at the BVI or Cayman level is minimal, or accept the top-up at the parent level as a cost of the existing structure. Each choice has a different cost profile and a different interaction with the underlying commercial agreements – intercompany lending arrangements, IP holding terms, and management services contracts all require review.

A micro-scenario: a Southeast Asian manufacturing group with a Cayman intermediate, a Hong Kong sub-holding entity and operating companies across the region came to our desk in early 2025. The Cayman intermediate had been receiving royalties from the operating companies under an IP holding arrangement that pre-dated the Pillar Two discussion by several years. The royalties created a large covered-income exposure at a zero effective rate in Cayman. The Hong Kong sub-holding entity, by contrast, was in full profit-tax-paying mode. The solution required a re-examination of the IP holding arrangement, a quantification of the SBIE at the operating-company level, and a reassessment of whether to onshore the IP into an entity in a jurisdiction with both a QDMTT and a tax treaty network. The outcome was structural and not resolved quickly – but the group had the analysis in place before the first fiscal year filing, which preserved the options.

What is our read on where the Pillar Two risk is heading?

Three developments in the current environment deserve close attention from in-scope groups with Hong Kong exposure.

The first is administrative guidance accumulation. The OECD has issued successive tranches of agreed administrative guidance since the GloBE Model Rules were finalised. Each tranche clarifies – and in some cases modifies – the calculation of covered taxes, the treatment of specific instruments, and the conditions for QDMTT safe harbour. Groups that locked in their Pillar Two analysis in 2023 or early 2024 may be working from an outdated technical baseline. The guidance is not static, and domestic implementation in any given jurisdiction will reflect the guidance as incorporated at the time of enactment.

The second is the transitional country-by-country reporting safe harbour. The OECD introduced a transitional mechanism under which groups can use simplified calculations based on existing country-by-country reporting data to determine whether a Pillar Two top-up arises in a given jurisdiction. This safe harbour is time-limited. Where a group qualifies, it substantially reduces the compliance burden for the transitional years. Where it does not qualify – or where the group has not assessed its eligibility – it is exposed to the full GloBE calculation requirement without the benefit of the simplification. Eligibility should be tested jurisdiction by jurisdiction, not assumed.

The third is enforcement posture. As the first fiscal years under the enacted regime close and the first GloBE information returns fall due, tax authorities are beginning to issue guidance and – in some jurisdictions – opening enquiries. Hong Kong's Inland Revenue Department has a track record of methodical, evidence-based enforcement on cross-border issues. We expect the FSIE and Pillar Two interface to be an area of sustained focus. Groups that have not coordinated their FSIE substance documentation with their Pillar Two effective-rate analysis are exposed to simultaneous enquiry on both fronts.

If an earlier analysis or filing approach produced an uncertain result, a second read can identify where the exposure remains open and what corrective steps are still available.

To discuss the Pillar Two position for your group's Hong Kong and offshore entities, contact us at info@lockhartyip.com.

How does the Pillar Two analysis interact with Hong Kong's broader tax and structuring position?

The interaction between Pillar Two and Hong Kong's broader tax position is not purely technical. It raises a structural question that every large group with a Hong Kong hub should address explicitly: is Hong Kong doing the job in the structure that it was designed to do, and does that job still make sense when a 15% floor applies globally?

Hong Kong's advantages remain real. No capital gains tax. No withholding tax on dividends or interest in the general position. A strong common-law court system, the Court of Final Appeal as the apex court, and well-tested enforcement infrastructure. Access to the Mainland market and the Mainland court system through the Mainland Judgments Ordinance and the arbitral arrangements. A substantial and growing double-tax agreement network. These are structural advantages that do not diminish under Pillar Two.

What changes is the argument that a Hong Kong entity can hold assets or channel income at a low effective rate. That argument was always partially territorial in character – it depended on the source rules treating income as non-Hong Kong-sourced and therefore exempt. Under Pillar Two, the territorial exemption does not shield the income from a global effective-rate calculation. The income is still within the group; the rate must still be measured; and if it falls below 15%, the top-up follows it wherever it is collected.

Our view is that Hong Kong retains its position as a genuine hub for cross-border groups – but the rationale shifts. The efficiency of the Hong Kong holding or sub-holding entity is now measured not by the nominal exemption it produces but by the substance it supports, the treaty access it provides, and the enforcement infrastructure it offers. Groups that have built their Hong Kong presence around substance – real employees, real decision-making, real expenditure – are better placed under Pillar Two than groups that used Hong Kong primarily as a pass-through.

For groups reviewing or rebuilding their holding structure in light of Pillar Two, our tax positions practice covers the full cross-border analysis, from FSIE and substance review through to Pillar Two effective-rate modelling and GloBE information return coordination.

Addressing a common misconception: does the territorial system make Hong Kong Pillar Two-safe?

The most persistent myth in our cross-border practice is that Hong Kong's territorial system, and its relatively modest headline rates, make it a low-risk jurisdiction under Pillar Two. The reasoning goes: Hong Kong taxes its profits; the rate is above 15% in many cases; therefore no top-up arises. That reasoning is partially correct and substantially incomplete.

It is correct that a Hong Kong entity earning fully Hong Kong-sourced, fully profits-taxed income at the 16.5% rate will generally produce a jurisdictional effective rate above 15%. In that confined scenario, no top-up arises at the Hong Kong level.

It is incomplete for three reasons. First, the FSIE exemptions reduce the effective rate for Hong Kong entities with offshore passive income. Second, the IIR operates downward through the group structure: even if Hong Kong's own rate is fine, the Hong Kong parent must still calculate the effective rate of every low-taxed constituent entity below it. Third, the substance-based income exclusion – which reduces the top-up calculation – is only available to the extent that the group has genuine payroll and tangible asset presence. A Hong Kong entity with minimal physical substance may have a smaller SBIE carve-out than one with real operational presence, increasing the covered income exposed to the top-up.

A second micro-scenario: a European group with a Hong Kong regional headquarters came to our desk having been advised by its European counsel that Hong Kong was "Pillar Two-neutral." The European analysis was correct at the Hong Kong entity level. It had not addressed the two Singapore subsidiaries and a Vietnam operating company beneath the Hong Kong entity, all of which were low-taxed constituent entities under the GloBE rules. The IIR at the Hong Kong regional headquarters level reached those entities. The top-up was material. The group's compliance calendar had not allocated time or resources for the GloBE information return at the Hong Kong level, because the assumption was that Hong Kong created no liability. Correcting the position before the filing deadline required an accelerated cross-border analysis across four jurisdictions.

Groups that have received single-jurisdiction Pillar Two advice should consider whether the cross-border interface has been fully mapped.

Self-assessment: what should an in-scope group have in place now?

Seven questions orient the assessment for a large group with Hong Kong exposure.

One: has the group confirmed that it meets the EUR 750 million consolidated revenue threshold and identified every jurisdiction in which constituent entities are resident? The jurisdictional entity map is the foundation of the GloBE calculation.

Two: has the group calculated the jurisdictional effective rate for Hong Kong, including the impact of any FSIE exemptions on covered income? An entity-by-entity analysis is not sufficient.

Three: has the group identified every constituent entity in a jurisdiction without a QDMTT – particularly BVI and Cayman intermediates – and modelled the IIR reach from the ultimate parent?

Four: has the group quantified its substance-based income exclusion at each jurisdiction level, including Hong Kong? The payroll and tangible asset figures feed directly into the SBIE calculation and reduce covered income.

Five: has the group assessed its eligibility for the transitional country-by-country reporting safe harbour, and documented the basis for any safe-harbour claim? Safe-harbour eligibility is not self-certifying.

Six: has the group verified that its Hong Kong QDMTT filing, if applicable, is consistent with the GloBE rules as clarified by OECD administrative guidance – not merely with the domestic IRD calculation?

Seven: does the group have a coordinated GloBE information return process across all relevant jurisdictions and competent authorities, including the Mainland China and Hong Kong authorities if both are engaged?

A "no" or "unsure" on any of these questions identifies an open risk point before the filing window closes.

Related practices

• Holding Structures – reviewing holding chains and offshore intermediates for Pillar Two and FSIE alignment
• Corporate Counsel – entity-level governance and cross-border substance documentation for in-scope groups

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• Tax Positions
• Treaty Access Between Hong Kong Cis Cis Matter
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This publication is general information and does not constitute legal advice. For advice on your situation, contact info@lockhartyip.com.