Where substance requirements for a tax position to hold stands now

Substance requirements – the obligation to demonstrate that income is genuinely earned where a group claims it is – have moved from a background concern to the central test applied by tax authorities across Hong Kong, the offshore holding centres and the Mainland alike. The governing regime in Hong Kong is the foreign-sourced income exemption (FSIE) regime (in force from 1 January 2023, as amended), which conditions an exemption from profits tax on demonstrable economic substance in the jurisdiction where income is booked. Alongside it, the Inland Revenue Ordinance continues to apply its territorial-source test, a test that has never been purely formal: where activities that generate profits actually take place decides where those profits are taxed, not where a signing ceremony is held or where a board resolution is passed.

This analysis sets out the current cross-border position – what has changed, where the enforcement risk is sharpest, and what a group or family office with Hong Kong in its structure needs to demonstrate in order for its tax position to hold.

What is actually at stake commercially?

The question at the top of the agenda for any CFO or group general counsel is straightforward: will the tax position survive a revenue examination? For years, many cross-border groups treated that question as theoretical. The structure was in place, opinions had been obtained, and no one had knocked on the door. That era is closing.

The commercial stakes are material. A position that fails on substance grounds does not simply generate an adjustment to the current year's liability. The revenue authority can look backwards across multiple assessment periods. Interest accrues. Penalties can be imposed. In some jurisdictions, the failure to disclose an aggressive position triggers its own consequences, separate from the underlying tax. For a group with a mid-market treasury function or a significant intellectual property holding structured through Hong Kong, the aggregate exposure across open years can be very large relative to the annual benefit the structure was designed to produce.

In our cross-border practice, we see two categories of group most exposed to this risk. The first is the group that designed its structure before the FSIE regime and the global minimum tax entered the picture, and has not updated its substance analysis since. The second is the group that relies on a substance report prepared for another purpose – a transfer-pricing file, or a banking KYC submission – and treats that as sufficient for a revenue enquiry. It is rarely sufficient. Revenue authorities ask for operational records, board minutes, payroll data, local staff profiles and the contracts that govern inter-company flows. A summary opinion without that supporting file will not hold.

The governing instruments and how the territorial test actually works

Hong Kong taxes profits on a territorial basis: profits tax applies to profits that arise in or derive from Hong Kong, under the Inland Revenue Ordinance. That principle sounds simple; its application is not. The question of where profits "arise" depends on where the profit-generating activities – the operations, the decisions, the contracts – are actually located. Courts and the Board of Review have consistently applied an operations test, not a legal-form test. The place of incorporation, the nationality of the directors, or the governing law of a contract answers a different question entirely.

The FSIE regime, which Hong Kong enacted in response to the European Union's assessment of its tax regime and subsequently amended, adds a second layer. Where a group entity receives covered income – dividends, interest, royalties and disposal gains from interests in entities – the income is only exempt from profits tax if one of three conditions is met. The entity must be a qualifying taxpayer meeting the economic-substance requirements for its category of activity; or the income must satisfy the equity-participation exemption conditions; or, for dividends and disposal gains, the holding period and participation thresholds must be satisfied. For most groups that hold intellectual property or run treasury operations through a Hong Kong entity, the substance requirement is the operative test.

What does substance actually require under the FSIE? The Inland Revenue Department has published guidance, but the operative standard is not a fixed headcount or a minimum property cost. It requires that the relevant income-generating activities – for a holding company, the management and oversight of equity investments; for a treasury entity, the treasury decisions; for an intellectual property holding entity, the development, enhancement, maintenance, protection and exploitation of the asset – are carried out by qualified employees in Hong Kong, with adequate physical presence and operating expenditure commensurate with the scale of the activity. The word "adequate" does the heavy lifting, and it is resolved on the facts.

For groups subject to the Hong Kong minimum top-up tax and the income inclusion rule under Pillar Two, which are effective for fiscal years beginning on or after 1 January 2025 for in-scope groups with consolidated revenue of EUR 750 million or more, a further layer applies. The qualified domestic minimum top-up tax mechanism means that a Hong Kong entity within an in-scope group that fails to meet substance thresholds may face top-up tax computed by reference to a 15% floor, applied by the Hong Kong authority before a foreign parent jurisdiction can apply its own top-up. The interaction between the FSIE substance test and the Pillar Two substance-based income exclusion is not yet fully settled in practice. Both operate in parallel; satisfying one does not automatically satisfy the other.

Where the cross-border interface bites: Hong Kong, the Mainland and the offshore layer

Most of the structures we see in cross-border practice are not a single Hong Kong entity in isolation. They involve a Mainland operating company, a Hong Kong intermediate holding or service company, and an offshore entity – in the BVI, the Cayman Islands, or another common-law holding centre – above it. The substance question bites at each level, and the answers interact.

At the Mainland level, the relevant concept is beneficial ownership (實際受益人), applied by the Mainland tax authority to determine whether a Hong Kong entity that receives dividends or royalties from a Mainland entity is the true beneficiary of the preferential rates available under the Arrangement between the Mainland and Hong Kong for the Avoidance of Double Taxation. The Mainland's guidance on beneficial ownership sets out a list of conditions that a Hong Kong entity must satisfy: it must have adequate substance, it must bear genuine economic risk, it must not be a conduit with no discretion over the income, and it must not be obliged to pass the income on within a short period. A Hong Kong holding entity that is merely a pass-through, with no employees, no operational presence and no real management, will not satisfy that test. The preferential withholding rate will be denied; the standard rate applies instead.

At the Hong Kong level, as described above, the FSIE and territorial tests apply. A group that maintains genuine substance in Hong Kong – real employees making real decisions, operating expenditure that reflects the scale of the activity – is well placed to defend both the source position under the Inland Revenue Ordinance and the exemption under the FSIE regime. A group that does not maintain that substance faces a dual problem: the Mainland authority denies the preferential rate on the way in, and the Hong Kong authority may assess profits tax on the income on the way through.

At the offshore level, BVI and Cayman entities are subject to their own economic-substance regimes, which require that a company carrying on a relevant activity – holding business, fund management, intellectual property, headquartering, among others – demonstrate that the relevant activity is directed and managed from the offshore jurisdiction, with qualified employees or management there or in a jurisdiction that has an equivalent regime. The offshore substance tests are not directly enforced by Hong Kong, but they interact with the Hong Kong analysis. A Cayman or BVI entity that fails its own substance test may trigger exchange-of-information reporting to the jurisdiction in which it ought to be resident, which may well be Hong Kong.

The practical result is that a group must maintain a coherent substance narrative across all three layers, not just the layer closest to the revenue authority conducting a review. We have seen matters where the Hong Kong position was defensible in isolation but collapsed because the offshore entity's filing conceded effective management from a third jurisdiction – creating a contradiction that the examining authority used to challenge the entire structure.

For a read on treaty access between Hong Kong and the United Kingdom in this context, see our analysis at Treaty access between Hong Kong and the United Kingdom.

The sequence above describes the standard cross-border position. Your matter turns on the documents, the jurisdictions actually engaged, and the activities your entities genuinely carry out – which is where the substance position is won or lost.

For a structured assessment of your group's substance position across the relevant jurisdictions, write to us at info@lockhartyip.com.

How does the comparative read across jurisdictions differ in practice?

Singapore is the jurisdiction most frequently compared with Hong Kong in this context. The comparison is instructive. Singapore's territorial system is broadly analogous to Hong Kong's, but Singapore applies an exemption for foreign-sourced income under different conditions, with its own economic-substance parameters. For a group choosing between the two jurisdictions as its regional holding hub, the substance test is not materially more demanding in one than the other at the level of principle. The practical difference lies in what each revenue authority scrutinises.

Singapore's Inland Revenue Authority has, in recent years, issued detailed guidance on what it expects from holding entities and service companies: it has published lists of qualifying indicators, minimum staff thresholds for certain categories, and illustrative examples. Hong Kong's Inland Revenue Department has taken a less prescriptive public approach; its guidance sets out principles rather than thresholds. That distinction cuts both ways. A group with a genuinely complex and bespoke operating model may find Hong Kong's principles-based approach accommodating. A group that wants certainty about the minimum it must do to satisfy the test may prefer a more explicit list.

The UAE, which several of our clients consider as a third option after the introduction of UAE corporate tax from 2023, has its own qualifying income and substance regime, particularly for entities in free zones. The UAE position is materially different from both Hong Kong and Singapore in its formal structure, and the substance requirements interact with the free-zone regime in ways that require separate analysis. We do not treat these jurisdictions as interchangeable for substance purposes.

What the comparative read confirms is a directional point: the global trend, driven by the OECD's base erosion and profit shifting (BEPS) work and the Pillar Two minimum-tax architecture, is towards greater substance requirements applied more rigorously. A structure that would have passed scrutiny in 2015 may not pass scrutiny now, and the enforcement tools – automatic exchange of information under Common Reporting Standard (CRS) arrangements, country-by-country reporting filed with the Inland Revenue Department and available for exchange with partner jurisdictions, and the Pillar Two transparency mechanism – have expanded the information available to revenue authorities considerably.

See also our overview of the Pillar Two minimum tax and its interaction with Hong Kong structures at Pillar Two: the Hong Kong minimum top-up tax.

What foreign and offshore-based counsel often misread

The most common error we see from counsel advising from outside Hong Kong – and sometimes from within it – is treating the substance requirement as a one-time box to check at the point of structuring. Substance is not an attribute of a structure; it is an ongoing operational condition. The Inland Revenue Department assesses it as at the time the income is received, not as at the time the entity was incorporated.

This matters because groups change. A Hong Kong entity that was genuinely managed from Hong Kong in year one, with two qualified finance employees and a real office, may by year three have shifted its management upstairs to the offshore parent or offshore to a new regional centre. The entity files the same profits tax return, claims the same position – but the operational reality no longer supports it. The substance file has not been updated. The board minutes are thin. The management decisions are being made elsewhere.

A second common error is conflating the source test and the substance test. They ask different questions. The source test under the territorial system asks where the profit-generating activities took place. The FSIE substance test asks whether an entity meets the economic-substance requirements for its specific category of covered income. A group can fail the source test (and therefore be liable to Hong Kong profits tax) without any FSIE analysis being relevant. Equally, a group can satisfy the FSIE substance test in respect of its covered income, while separately having an exposure on a different income stream that is assessed under the territorial source rules. The two analyses run in parallel, not in sequence.

A third error is treating transfer-pricing documentation as a substitute for a substance analysis. Transfer-pricing files document the arm's-length character of inter-company pricing; they do not, by themselves, demonstrate that an entity has economic substance. A revenue authority conducting a substance review will ask for the transfer-pricing master file and local file, but it will also ask for the operational records, the staff contracts, the office lease, the management accounts and the board papers. If those documents tell a different story from the transfer-pricing characterisation, the transfer-pricing position becomes harder to defend as well.

A micro-scenario: where the substance gap surfaces

Consider a European-headquartered industrial group that restructured its Asia-Pacific holding through a Hong Kong intermediate company in the years before the FSIE regime. The Hong Kong entity received dividends from a Mainland operating subsidiary at the preferential treaty rate and passed them upward to a Cayman holding company. The Hong Kong entity had one local director – a nominee – one bank account, and filed a nil profits tax return on the basis that it had no Hong Kong-source income.

When the Mainland subsidiary's tax file was examined, the reviewing authority applied the beneficial ownership analysis. The Hong Kong entity had no employees, no active management, and no discretion over the dividend: the amount and timing were determined entirely at the Cayman parent level. The authority denied the preferential withholding rate and assessed at the standard rate. That adjustment, applied to several years of dividend flows, produced a material liability.

The group then asked its advisers whether the Hong Kong entity could claim credit for Mainland withholding tax already paid. The analysis of that question – under the Arrangement between the Mainland and Hong Kong for the Avoidance of Double Taxation – depended on whether the Hong Kong entity was the genuine taxpayer. Because the beneficial ownership position had been rejected on the Mainland side, the credit analysis was complicated. The group ended up in a multi-year resolution process involving the Mainland authority, the Hong Kong Inland Revenue Department, and the mutual agreement procedure.

The lesson is not that the structure was wrong in concept. A Hong Kong holding entity between a Mainland operating company and an offshore parent is a well-established and legitimate configuration. The failure was operational: the entity was never given the substance it needed – real employees, real management decisions, real records – to sustain the position it was filing.

Where the enforcement risk sits now and what a group must demonstrate

The enforcement risk for substance positions is materially higher now than at any point in the last decade. The reasons are structural and are not specific to Hong Kong.

First, automatic exchange of financial account information under CRS means that the Mainland authority, the Hong Kong Inland Revenue Department, and the offshore registries in the BVI and Cayman are each receiving information reported by the others' financial institutions. A Cayman entity's bank account information, filed by the Cayman bank, reaches the Mainland authority if the entity's controlling person is a Mainland resident. That information may trigger a review of the entire structure.

Second, country-by-country reporting, required of in-scope MNE groups under the Pillar Two architecture and implemented in Hong Kong, gives revenue authorities a consolidated view of where profit is booked relative to where employees and assets are located. A group that books significant profit in Hong Kong but shows minimal local employment and assets in its country-by-country report is flagging a risk to every authority that receives the report.

Third, the Pillar Two top-up tax mechanism gives the Hong Kong Inland Revenue Department an affirmative financial interest in assessing whether a group entity meets the substance-based income exclusion. The exclusion reduces the effective tax rate computation, and therefore the top-up tax payable. An authority reviewing whether the exclusion is properly claimed will, by necessity, be reviewing the substance of the entity in question.

What must a group demonstrate? In our view, the minimum file for a Hong Kong intermediate holding or service company that receives covered income under the FSIE regime includes: evidence of qualified employees (or contracted qualified persons) in Hong Kong carrying out the relevant activities; records of decisions made in Hong Kong, including board papers and resolutions signed in Hong Kong by directors who are present in Hong Kong at the relevant times; operating expenditure records showing that costs commensurate with the activity are incurred in Hong Kong; and contracts between the Hong Kong entity and its counterparties – both the Mainland subsidiary below and the offshore parent above – that reflect the genuine economic arrangements, not merely a formal flow of funds.

For an intellectual property holding entity, the additional requirement is documentation of the development, enhancement, maintenance, protection and exploitation activities – the DEMPE functions, in transfer-pricing language – that are carried out in Hong Kong. If those functions are carried out by the Mainland operating company and merely licensed upward, the intellectual property holding entity in Hong Kong will have difficulty demonstrating the substance required for FSIE purposes and will likely also face challenge on the beneficial ownership analysis for any royalty flows from the Mainland.

If an earlier structure or filing position has produced an adverse result or a stalled revenue engagement, a re-read of the substance file can identify what is missing and what routes remain open. To discuss your position, write to us at info@lockhartyip.com.

A second micro-scenario: sustaining substance through a corporate reorganisation

A family-office principal with a diversified portfolio across Greater China and Southeast Asia held the portfolio through a Hong Kong company that had been actively managed from Hong Kong for several years. Two qualified investment professionals were employed locally; the investment committee met in Hong Kong; the office lease, payroll and service agreements were all Hong Kong-based. The substance position was defensible.

A reorganisation in the spring of 2026 moved the senior decision-maker to Singapore. The Hong Kong company remained in place, and the two local professionals remained employed. However, the investment committee structure changed: formal meetings were held in Singapore, and the Hong Kong professionals attended by video. Board minutes were drafted and signed by a Singapore-based director.

In the following assessment year, the Inland Revenue Department issued a standard enquiry asking the company to confirm the basis of its FSIE exemption claim. The exemption was for dividend income received from portfolio companies. The enquiry asked: where were the management decisions made? The answer, on the documentation as it stood, pointed to Singapore.

We were instructed to review the position. The operational reality was that the Hong Kong professionals were doing the analytical work; the Singapore director was reviewing and approving in a largely formal capacity. The issue was documentary: the governance records did not reflect where the real management activity was occurring. We worked with the group to reconstruct the record – on the basis of emails, internal analyses and meeting notes – and to amend the committee structure prospectively so that the Hong Kong management activity was clearly reflected in the governance documents. The enquiry was resolved. But the exposure could have been avoided with better contemporaneous records from the point of the reorganisation.

Our read: where the risk sits and what the next move is

Our view, based on the direction of travel in Hong Kong, on the Mainland and across the offshore centres, is that substance requirements are now genuinely non-negotiable. The window in which a group could rely on legal form – the right jurisdiction of incorporation, the right governing law, the right treaty claim – without operational reality behind it has closed. The question is no longer whether a revenue authority can challenge a thin structure. It is whether the group has maintained the file to defend the position it is claiming.

The risk sits in three places. First, in existing structures that predate the FSIE regime and have not been reviewed since. Second, in structures that have been reorganised without updating the substance analysis. Third, in groups that are entering the Pillar Two regime for the first time in fiscal years beginning on or after 1 January 2025 and have not modelled the interaction between the substance-based income exclusion and their FSIE position.

The practical immediate step for most groups is a substance audit: a review of each Hong Kong entity's operational reality against the current standard. That audit should produce, for each entity, a clear statement of the activities carried out in Hong Kong, the employees or contracted persons carrying them out, the operating expenditure incurred, and the governance records that evidence the decisions. Where gaps are identified, the correction is operational – adding local staff, moving committee meetings, amending governance documents to reflect reality – not documentary window-dressing.

For a fuller read on the tax-positions practice and how it sits alongside holding structure and cross-border enforcement, see Tax Positions – Lockhart & Yip.

Objection: is this not over-reading the enforcement appetite?

A common view among groups that have held positions without challenge for several years is that the enforcement appetite is lower than the commentary suggests. The argument runs: our structure has never been questioned; we have received clean assessments for a decade; why should we invest in a substance audit now?

The argument has a surface logic, but it misreads the position for two reasons. First, the FSIE regime and the Pillar Two mechanism are recent additions to the toolkit. A group assessed for years before those regimes were in force was assessed under a different standard. The absence of challenge in the past is not a precedent; it is a feature of a different regulatory moment. Second, the information-exchange architecture described above means that a review of one entity in one jurisdiction can now surface the entire group structure to multiple authorities simultaneously. A position that was never visible to a revenue authority is now visible through CRS and country-by-country reporting. The absence of historical challenge is cold comfort for a forward-looking exposure.

The better framing is not "has anyone challenged us" but "can we demonstrate, today, on the documents and operational records we currently hold, that our position is correct." If the honest answer is uncertain, that is the risk.

Related practices

Related practices

• Holding Structures – structuring offshore and Hong Kong intermediate holding entities across jurisdictions
• Corporate Counsel – governance, Companies Ordinance compliance and Significant Controllers Register obligations
• M&A & Transactions – cross-border acquisitions and disposals with Hong Kong and offshore holding layers

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