Pillar Two and the Hong Kong minimum top-up tax

A multinational group that books significant revenue through Hong Kong or uses Hong Kong as a regional holding hub cannot simply assume its existing structure is Pillar Two-ready. The question is never only the headline rate. It is whether the group's Hong Kong entities carry sufficient economic substance, whether its qualifying income passes the relevant tests under the foreign-sourced income exemption regime, and whether the Hong Kong minimum top-up tax produces a coordinated outcome with the group's top filing jurisdiction. In our cross-border tax practice, the groups that reach us at the most critical juncture are those that have modelled the headline rate correctly but missed the substance-and-source analysis that determines the actual top-up exposure.

Hong Kong introduced a minimum top-up tax and an income inclusion rule for in-scope multinational enterprise groups, effective for fiscal years beginning on or after 1 January 2025, applying to groups with consolidated revenue of EUR 750 million or above in at least two of the four preceding fiscal years. The governing instruments are the Inland Revenue Ordinance as amended to implement the OECD Pillar Two framework, the Foreign-Sourced Income Exemption regime in force since 1 January 2023, and the standard territorial profits tax regime applying 8.25% on the first HK$2,000,000 of assessable profits and 16.5% above that threshold. The interaction of these instruments, not any one of them in isolation, determines a group's Hong Kong exposure.

This service note describes who needs this work, how we run it alongside locally licensed Hong Kong counsel, and what decisions the principal must own before filing season opens.

When does a foreign principal actually need this service?

The trigger is rarely a single event. It is a structural condition that crystallises when one or more of three factors converge: the group crosses the EUR 750 million consolidated revenue threshold for the first time, Hong Kong entities move from passive holding to active trading or treasury functions, or a restructure creates a new Hong Kong intermediate entity whose tax profile has not been mapped against the Pillar Two qualified domestic minimum top-up tax rules.

What foreign principals consistently underestimate is the sequential nature of the analysis. A group cannot address Hong Kong's minimum top-up tax position without first confirming the effective tax rate of each Hong Kong constituent entity under the Pillar Two GloBE (Global Anti-Base Erosion) rules – the OECD framework that defines how taxes are calculated and allocated across jurisdictions. That calculation depends on the substance-based income exclusion, payroll and tangible-asset carve-outs that the GloBE rules permit. Groups with genuine operational substance in Hong Kong fare materially better than holding-only structures. The territorial profits tax system, with no tax on capital gains, no withholding tax on dividends, and no VAT, is well-suited to genuine trading activity – but only if the substance is documented and defensible.

The structural_complexity trigger sharpens further when the group's ultimate parent entity sits outside Hong Kong and must decide which jurisdiction applies the income inclusion rule first. That sequencing question is cross-border work. It sits at the intersection of Hong Kong tax law, the home jurisdiction's Pillar Two legislation, and the group's treaty network. In our practice, we see this most acutely in groups where the UPE (ultimate parent entity) is in a jurisdiction that enacted Pillar Two rules on a timeline different from Hong Kong's.

The sequence above describes the standard position. Your matter turns on the documents, the jurisdictions actually engaged, and the order of steps – which is where the route is won or lost.

To discuss how Hong Kong's minimum top-up tax applies to your group's cross-border structure, contact info@lockhartyip.com.

How does Hong Kong's territorial system interact with the GloBE rules?

Hong Kong taxes profits on a territorial basis: the Inland Revenue Ordinance charges profits tax only on profits arising in or derived from Hong Kong. That boundary – source versus non-source – is the first analytical step in any Pillar Two engagement, because the GloBE rules require the group to compute adjusted covered taxes and GloBE income for each constituent entity on a jurisdiction-by-jurisdiction basis.

For a Hong Kong entity, the effective tax rate under the GloBE rules is not simply the domestic headline rate. It is the ratio of adjusted covered taxes – taxes that qualify for inclusion under the GloBE rules, subject to specific deferred-tax adjustments – to GloBE income, which excludes certain items that the domestic tax system may treat differently. A Hong Kong entity that earns substantial income outside Hong Kong, and therefore pays no Hong Kong profits tax on that income under the territorial system, may show a lower GloBE effective tax rate than the headline 16.5% rate would suggest. That gap is the source of top-up exposure.

The Foreign-Sourced Income Exemption regime – the FSIE regime (Hong Kong's rule requiring economic substance for certain passive income to be exempt from profits tax when received in Hong Kong) – adds a further layer. Since 1 January 2023, the FSIE regime has imposed economic-substance conditions on dividends, interest, gains on disposal of equity interests, and intellectual-property income received in Hong Kong by a multinational enterprise group entity. A group that structures passive income flows through Hong Kong must satisfy FSIE substance conditions or the income becomes taxable at the full profits tax rate. Under the GloBE rules, that taxable income then counts towards the Hong Kong effective tax rate computation. The interaction can cut both ways: FSIE compliance can improve the GloBE effective tax rate, but failing FSIE while expecting an exemption distorts the computation in both the domestic and Pillar Two analyses.

There is no single arithmetic answer here. The calculation depends on the entity's asset base, payroll in Hong Kong, the nature of the income flows, and the group's elections at the global filing level. These are decisions the client must own with full information.

What is the cross-border interface between Hong Kong and the group's home jurisdiction?

The mandatory cross-border dimension of this work is the allocation of filing and top-up obligations between Hong Kong and the UPE jurisdiction. Under the qualified income inclusion rule framework that Hong Kong has adopted, a Hong Kong UPE of an in-scope group applies the income inclusion rule to low-taxed constituent entities of the group outside Hong Kong. Where the UPE is outside Hong Kong, a nominated filing entity in Hong Kong may be required for Hong Kong reporting purposes.

This creates a two-directional exposure. First, if Hong Kong constituent entities of a non-HK-parented group are low-taxed under the GloBE rules, the UPE jurisdiction's income inclusion rule may impose a top-up charge at the parent level – before Hong Kong's own qualified domestic minimum top-up tax applies. The sequence in which these charges are levied is not optional: it follows the agreed OECD ordering rules, and it determines where the tax is paid and by which entity. Groups that model only the domestic Hong Kong position without consulting the UPE jurisdiction's own Pillar Two enacted rules can reach entirely wrong conclusions about net group exposure.

Second, and equally important: Hong Kong's qualified domestic minimum top-up tax operates as a protective mechanism. If Hong Kong's own minimum top-up tax brings the effective tax rate of Hong Kong entities up to the global minimum, the UPE jurisdiction's income inclusion rule should not apply an additional charge in respect of those entities. That protection, however, only works if the Hong Kong domestic minimum top-up tax is correctly computed, correctly filed, and treated as a qualified domestic minimum top-up tax under the OECD framework – a status that depends on how Hong Kong's enacting legislation is assessed by the relevant international peer-review process.

We work on this interface directly. For groups where the UPE is in a jurisdiction outside our international coverage, we coordinate with allied counsel admitted in the relevant jurisdiction. The Hong Kong filing and computation work sits with us and, for lodgement and domestic compliance steps, with the locally licensed Hong Kong firms with whom we work.

How does the engagement run, step by step?

The first step is a scoping call and a document intake. We ask for the group structure chart, the last two consolidated revenue figures in EUR, the list of Hong Kong constituent entities and their function profiles, the current FSIE substance position for any passive income flows through Hong Kong, and the UPE jurisdiction's Pillar Two implementation status. Without these, any preliminary view is provisional.

Step two is a GloBE entity-level effective tax rate analysis for each Hong Kong constituent entity. This is the core analytical work. We apply the GloBE income and tax computations to the entity's financial data, identify the substance-based income exclusion available on Hong Kong payroll and tangible assets, and produce a working ETR figure for each entity. Where the ETR falls below the global minimum rate, we calculate the provisional top-up amount.

Step three maps the cross-border ordering question. We identify where the income inclusion rule applies first – the UPE jurisdiction or Hong Kong's qualified domestic minimum top-up tax – and confirm that the group's filing approach in the UPE jurisdiction is consistent with Hong Kong's domestic computation. This step almost always involves an exchange with the group's home-jurisdiction tax team or allied counsel.

Step four is the substance review. For any entity that is close to the ETR threshold, substance-based income exclusions can move the number materially. We review the actual payroll costs and tangible-asset book values in Hong Kong, confirm that they are properly supported, and assess whether any re-allocation of functions or assets would produce a defensible improvement. We do not advise on artificial arrangements; we advise on whether genuine functions already present are being correctly counted.

Step five is document preparation. This includes the analysis memorandum, the computation workpapers, and the instructions to locally licensed Hong Kong counsel for the domestic filing. The Inland Revenue Department receives the return; locally licensed firms handle the lodgement. We prepare the underlying positions.

Step six is the ongoing monitoring engagement. Pillar Two is not a once-and-done exercise. The substance-based income exclusion percentages under the GloBE rules reduce over a transitional period. The FSIE regime is subject to amendment. Groups in scope need a standing review schedule, not a one-time computation.

Where do locally licensed Hong Kong counsel join the process?

Lockhart & Yip advises on international and foreign law. We do not practise the law of Hong Kong. For this engagement, that means the analysis memorandum, the cross-border coordination, and the substance and source positions are ours. The domestic profits tax return, the Hong Kong minimum top-up tax filing, and any correspondence with the Inland Revenue Department are handled by locally licensed Hong Kong counsel with whom we work.

The handoff point is clearly defined. Once the analysis workpapers are complete and agreed, we brief the local firm on the positions taken, the computations, and any areas where the Inland Revenue Department may seek clarification. We remain engaged through any query stage. The client has a single integrated team across the two layers, not parallel processes that may produce inconsistent positions.

This model avoids the most common structural error we see in large-group Pillar Two work: the international analysis and the domestic filing being handled by separate teams that never compare notes until an IRD query arrives. By the time that query arrives, the window for a clean position is significantly narrowed.

What documents and decisions must the client own?

There are four decisions a principal cannot outsource.

First, the UPE jurisdiction filing position. Whether the group files a GloBE information return in the UPE jurisdiction, and what that return says about Hong Kong entities, determines the consistency test that Hong Kong's domestic filing must satisfy. The group's board or GC must confirm that position before Hong Kong work begins.

Second, the FSIE substance election. For Hong Kong entities receiving passive income that could be characterised as a dividend, interest, disposal gain or IP income, the group must decide whether to assert FSIE exemption or include the income as taxable. That decision has both a domestic tax consequence and a GloBE ETR consequence. It cannot be made by counsel alone; it requires the group's sign-off.

Third, the transition-period elections. The GloBE rules contain certain safe harbours and transitional elections available in early implementation years. Elections made in one jurisdiction may affect the group's position in another. The group must decide whether to use the transitional qualified domestic minimum top-up tax safe harbour for Hong Kong, a decision that requires understanding of how Hong Kong's computation compares to the country-by-country report data on which the safe harbour depends.

Fourth, the entity nomination for local filing. Where the UPE is outside Hong Kong, the group must designate a local filing entity in Hong Kong if a GloBE information return is required to be filed locally. The identity of that entity, and its authority to file on behalf of the group, must be documented and held by the client.

These four decisions are not administrative details. They are positions with multi-year consequences. Our role is to prepare the full analysis that lets the principal make each decision with complete information.

What foreign counsel and in-house teams frequently get wrong

The most common error is treating Hong Kong's effective tax rate as fixed at the headline rate. It is not. The GloBE computation applies specific adjustments to both the numerator and the denominator. Deferred tax adjustments, adjustments for non-qualifying refundable imputation taxes, and the substance-based income exclusion all move the final number. A group that starts from the assumption that its Hong Kong entities are automatically above the global minimum rate because the headline rate exceeds it will miss genuine top-up exposure in entities that earn predominantly foreign-sourced income.

A second frequent error is treating the FSIE regime as a standalone domestic compliance issue unconnected to Pillar Two. In our cross-border practice, we regularly advise groups that have run their FSIE analysis and their GloBE analysis in separate work streams, producing inconsistent characterisations of the same income flows. The Inland Revenue Department receives both the profits tax return and the minimum top-up tax filing. Inconsistency between them is a clear audit flag.

A third error – perhaps the most consequential – is the timing assumption. Many in-house teams assume that because Pillar Two took effect for fiscal years beginning on or after 1 January 2025, there is no urgency until the first filing deadline under the new regime. In practice, the FSIE substance review and the GloBE ETR computation require data that must be assembled before year-end of the first fiscal year in scope. Groups that wait until after year-end to start the analysis are working with historical data and lose the opportunity to make real-time adjustments to substance, asset allocation or income flows that could affect the outcome.

If an earlier filing, structure or enforcement attempt produced an adverse or stalled result, a second read can identify the strategic error and the routes still open. Email info@lockhartyip.com with a description of your current position.

Decision map: situation, instrument, route, and risk

The practical analysis reduces to a set of decision branches that run as follows.

Where a Hong Kong entity of an in-scope group earns primarily Hong Kong-source trading profits and carries genuine operational substance – payroll, management, tangible assets in Hong Kong – the territorial profits tax at up to 16.5%, combined with the substance-based income exclusion under the GloBE rules, is likely to produce an effective tax rate at or near the global minimum. The risk is low, but must be verified on the actual numbers, not assumed. The instrument is the Inland Revenue Ordinance and the GloBE rules as implemented. The route is a standard domestic computation with a GloBE workpaper overlay.

Where a Hong Kong entity is a pure holding vehicle receiving dividends from non-Hong Kong subsidiaries, and those dividends are not brought within the FSIE regime's chargeable scope, Hong Kong profits tax on those dividends may be nil. Under the GloBE computation, low or nil covered taxes on significant income creates a low ETR and potential top-up exposure. The instrument is the qualified domestic minimum top-up tax. The route is a computation of the top-up amount, a check of the UPE jurisdiction's IIR position, and a filing by locally licensed counsel. The risk is misalignment between the domestic computation and the UPE jurisdiction filing if the two work streams are not coordinated.

Where a Hong Kong entity earns interest or IP royalties and relies on FSIE exemption, the risk depends on whether the substance conditions are met. If they are not, the income is taxable at the full profits tax rate. Under the GloBE computation, that creates a higher ETR – which could reduce top-up exposure – but creates a domestic tax liability that the group had not budgeted. The route is a substance review before year-end, not after.

Where the group has no Hong Kong constituent entity but uses Hong Kong as a contractual hub – for example, a foreign group whose contracts are negotiated and concluded in Hong Kong by employees of a foreign entity – the question is whether a permanent establishment exists for Hong Kong profits tax purposes. If it does, that entity becomes a constituent entity for Pillar Two purposes with its own ETR computation. The route is a source-and-substance analysis under the territorial basis, coordinated with the Pillar Two filing position.

Self-assessment checklist before engaging

Before the first call, a group should be able to answer the following questions. If it cannot, the engagement begins by answering them.

Does the group meet the EUR 750 million consolidated revenue threshold in at least two of the four most recent fiscal years?
Which fiscal year is the first year in scope for the Hong Kong minimum top-up tax and the income inclusion rule?
Has the UPE jurisdiction enacted Pillar Two legislation, and does it contain a qualified domestic minimum top-up tax safe harbour provision?
What Hong Kong constituent entities exist, and what functions do they perform – trading, holding, treasury, IP licensing?
For each Hong Kong entity, what is the approximate split between Hong Kong-source and non-Hong Kong-source income?
Is the FSIE substance position for any passive income flows through Hong Kong documented and defensible?
Who is the nominated local filing entity in Hong Kong for GloBE information return purposes?
Are the group's country-by-country report data for Hong Kong consistent with the GloBE computation that would be produced from the entity financial statements?

Groups that can answer all eight questions with documented support are in a strong position to move quickly to the computation and filing stage. Groups that cannot should begin the scoping engagement immediately: the first fiscal year in scope will not wait.

Related practices

Tax Positions – cross-border tax structuring, source analysis and treaty access from Hong Kong
Holding Structures – BVI, Cayman and Hong Kong holding entity design and substance review

Frequently asked questions

How does the cross-border element affect Pillar Two and the Hong Kong minimum top-up tax for a large group?

The cross-border element is the central analytical issue, not a secondary consideration. A Hong Kong constituent entity's effective tax rate under the GloBE rules depends on covered taxes and GloBE income as defined at the international level, not only under Hong Kong domestic law. Where the ultimate parent entity is in a different jurisdiction, that jurisdiction's income inclusion rule interacts with Hong Kong's qualified domestic minimum top-up tax through an ordering mechanism. Coordinating the two filings – and ensuring the Hong Kong domestic computation is consistent with the UPE jurisdiction's GloBE information return – is the core of the cross-border engagement. Groups that manage these two filings as separate domestic exercises consistently produce inconsistent positions that are difficult to defend on inquiry.

How long does Pillar Two and the Hong Kong minimum top-up tax for a large group usually take?

The timeline depends on the complexity of the group's Hong Kong constituent entity profile and the availability of the underlying financial data. A straightforward group with one or two Hong Kong entities and a clean income profile can be analysed, documented and briefed to locally licensed counsel for filing within six to eight weeks of complete document intake. A group with multiple Hong Kong entities, mixed income flows, FSIE substance questions and a UPE jurisdiction that has enacted Pillar Two on a different timetable will require a longer engagement. Parties should verify the current filing deadline with locally licensed counsel before setting the project timetable, as the Inland Revenue Department's deadline for the first returns under the new regime is subject to confirmation.

Which jurisdiction's law applies to Pillar Two and the Hong Kong minimum top-up tax for a large group?

Hong Kong's minimum top-up tax is imposed by Hong Kong law – the Inland Revenue Ordinance as amended to implement the GloBE framework. Hong Kong is the jurisdiction that levies the charge and administers the filing. However, the computation itself follows the OECD GloBE rules, which are an internationally agreed set of definitions and calculations that apply consistently across all jurisdictions that have enacted Pillar Two legislation. The interaction with the UPE jurisdiction's income inclusion rule is governed by that jurisdiction's own enacting legislation. A complete Pillar Two analysis for a Hong Kong constituent entity therefore draws on Hong Kong law, the OECD framework, and the UPE jurisdiction's national legislation simultaneously. That multi-jurisdictional character is the reason a Hong Kong-based international adviser – coordinating with allied counsel where the UPE jurisdiction requires it – produces a more coherent output than a purely domestic approach.

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