A family office client called us in late 2024 with a question that surprised us: they wanted to establish a holding structure using a UAE entity, and their current advisors had told them this was still the optimal structure for their European investments. We asked to review the analysis. What we found was a proposal that would have locked this client into a structure already compromised by regulatory changes and about to become substantially worse.
This is not an isolated incident. We are seeing a pattern of advisors continuing to recommend GCC holding structures without adequately accounting for the cumulative effect of several major regulatory developments that have fundamentally altered the calculus. The window for certain GCC-EU structuring approaches is not just narrowing; it is closing, and it will be substantially closed by the end of 2026.
We need to be direct about what is happening, because the consequences of getting this wrong are severe.
The UAE Corporate Tax Revolution
The United Arab Emirates introduced corporate tax at 9% effective from June 1, 2023. This was not entirely unexpected; the UAE had signaled for years that its zero-tax regime was unsustainable in the face of OECD pressure and the Pillar Two framework, but the speed of implementation caught many practitioners off guard. We had expected a transition period of several years. We got eight months.
For structuring purposes, the impact is straightforward: a UAE entity that was previously tax-neutral is now a 9% tax payer. This changes the math of any structure that relied on the UAE entity as a pass-through or low-tax accumulation vehicle. The 9% rate is not high by European standards, but it is not zero, and it applies to the worldwide income of UAE entities, not just UAE-source income.
More significantly, the UAE corporate tax regime includes antiavoidance provisions that target the specific structures that made the UAE attractive for holding company purposes. The participation exemption, which exists to avoid double taxation on dividends and capital gains, has conditions. Substance requirements apply. The treatment of foreign branches and permanent establishments has been clarified in ways that affect multinational structures.
A client came to us with an existing UAE holding company structure that had been designed when the UAE was tax-free. The structure worked as follows: a UAE holdco owned a Dutch BV, which owned operating companies in Europe. The UAE entity did not pay tax. The Dutch BV received dividends from the European operating companies, and those dividends were largely tax-free due to the Dutch participation exemption. The structure was elegant in its simplicity.
The UAE corporate tax changed everything. The UAE entity now pays 9% on its worldwide income, which includes the dividends received from the Dutch BV. The Dutch BV still benefits from the participation exemption, but the UAE entity cannot credit the Dutch tax against its UAE liability because the UAE entity is not the direct recipient of the European-source income. The structure, which previously achieved effective taxation of roughly 3-5% on European earnings, the Dutch withholding tax plus the Dutch corporate tax on the margin, now faces an effective rate of roughly 12-14%: 9% UAE corporate tax plus Dutch withholding tax plus Dutch taxation of the margin retained in the BV.
The structure no longer makes sense, and it will make even less sense when Pillar Two is fully implemented.
OECD Pillar Two and the GCC Position
Pillar Two, the OECD’s framework for a global minimum tax of 15%, has now been enacted or is in the process of being enacted in most major jurisdictions. The European Union implemented Pillar Two through Directive 2022/2523, which required member states to bring the rules into national law by the end of 2023. The United Kingdom, Switzerland, and most other European jurisdictions have either implemented Pillar Two or committed to doing so.
The GCC states have taken a different approach. The UAE, Saudi Arabia, and Qatar have all introduced or committed to domestic minimum tax regimes that align with Pillar Two principles, but the implementation timing and specific rules vary by jurisdiction. The key point for structuring purposes is this: under Pillar Two, the income of a UAE entity that is part of a multinational group with revenue above 750 million euros will be subject to a top-up tax to the extent its effective tax rate is below 15%.
For the UAE structure we discussed above, this means that the 9% UAE corporate tax will trigger a top-up tax of 6% when the Pillar Two rules are fully operational. The effective tax rate on the income retained in the UAE entity will be 15%, not 9%. The structure that was designed to achieve tax efficiency will now achieve tax neutrality at best, and this assumes that the structure survives the other challenges we are about to discuss.
The Pillar Two rules also include a subject to tax rule (STTR) that allows jurisdictions to impose additional tax when payments are made to related parties in jurisdictions with effective tax rates below 9%. This rule has not yet been activated in the EU, but it is expected to be activated in 2026, and its implications for GCC-EU structures are severe. A payment from a European company to a UAE related party that is subject to the 9% UAE corporate tax could trigger the STTR if the STTR threshold is set at or below 9%.
EU Grey Lists, Black Lists, and Treaty Dynamics
The European Union maintains two lists of jurisdictions for tax purposes: the grey list, officially, the list of non-cooperative jurisdictions for tax purposes, and the black list, officially, the list of high-risk third countries. The grey list includes jurisdictions that have made commitments to reform but have not yet implemented those commitments. The black list includes jurisdictions that have not made satisfactory commitments.
The UAE has been on the grey list since 2020, primarily because of concerns about its tax transparency and the substance requirements of its free zones. The grey list status has implications for taxpayers using UAE structures: the benefits of certain EU directives, particularly the Interest and Royalty Directive and the Parent-Subsidiary Directive, may be denied or limited for payments to UAE entities that are structured through grey-listed jurisdictions.
More significantly, the grey list status affects treaty benefits. Several EU member states have implemented “anti-treaty shopping” provisions that deny treaty benefits to payments made to residents of grey-listed jurisdictions. The Netherlands, traditionally the most treaty-friendly jurisdiction in Europe, has implemented such provisions, meaning that dividends, interest, and royalties flowing from Dutch companies to UAE entities may be subject to Dutch withholding tax even where a treaty would otherwise reduce the rate.
The UAE has made substantial progress in addressing EU concerns, and removal from the grey list is expected in 2025 or 2026. However, removal from the grey list does not resolve the underlying substance issues that caused the grey listing in the first place. The EU’s concerns about the UAE were not primarily about tax rates; they were about transparency, beneficial ownership information, and the real economic substance of entities operating in UAE free zones. These concerns persist, and they affect the viability of certain structuring approaches regardless of grey list status.
Free Zone Substance: The Gap Between Promise and Reality
UAE free zones have been marketed aggressively as locations for holding company structures. The marketing emphasizes zero or low taxation, world-class infrastructure, and ease of incorporation. What it does not emphasize, and what we find clients consistently underestimate, is the substance requirement that actually matters for tax purposes.
The free zones that are recognized by the UAE Ministry of Finance for corporate tax purposes, the “qualifying free zones,” have specific substance requirements. To benefit from the 0% tax rate on qualifying income, entities must satisfy these requirements, which include having sufficient employees, incurring adequate expenditure, and conducting core income-generating activities in the free zone.
The gap between the marketing promise and the regulatory reality is striking. Clients come to us with structures that rely on free zone entities that have one or two employees, minimal local expenditure, and no actual business activities conducted in the free zone. These structures are marketed by service providers who promise “free zone establishment with full tax benefits” without explaining that the tax benefits are conditional on actual substance that most such entities do not have.
We have reviewed dozens of free zone structures in the past two years. In our experience, fewer than 20% of the structures we review actually meet the substance requirements that would justify the tax benefits being claimed. The rest are structures that would fail a serious substance audit, exposing the owners to significant tax liabilities and potential penalties.
The problem is compounded by the fact that the UAE tax authorities have substantially increased their audit activities since the introduction of corporate tax. The days of the UAE as a jurisdiction where tax compliance was a formality are over. The authorities are now actively reviewing structures, demanding substance documentation, and assessing additional tax where substance requirements are not met.
What Still Works (and What Doesn’t)
None of this means the UAE is useless for international structuring. It means the UAE must be used with sophistication and realism.
What still works: regional operating structures where the UAE entity performs genuine functions. A trading company that actually negotiates and executes trades, with staff who understand the markets and authority to bind the company. A licensing company that develops and exploits intellectual property, with R&D activity and meaningful decision-making. A family office structure where the UAE entity holds assets and makes investment decisions, with investment professionals based in the UAE.
What does not work: passive holding structures where the UAE entity merely owns shares in other companies without performing active functions. Letterbox structures that exist only to hold assets and collect dividends. Free zone entities that have no employees, no activities, and no substance beyond a registered address.
The distinction is not semantic. It is the difference between a structure that will survive audit and a structure that will not.
For European holdings specifically, the window is narrowing rapidly. The combination of UAE corporate tax, Pillar Two implementation, and EU anti-avoidance rules has compressed the benefits of GCC-EU structures. What was once a significant tax advantage is now, in many cases, a minor benefit or even a disadvantage compared to direct holding or alternative jurisdictions.
The Timeline Pressure: 2025-2026
We are now in the critical period. The UAE corporate tax has been in effect since June 2023. Pillar Two rules are being implemented across Europe, with full effect expected by 2026. The EU grey list review process is ongoing, with UAE removal expected but not guaranteed.
For clients with existing GCC-EU structures, the next eighteen months are critical. Structures that were optimized for the pre-2023 environment need to be reviewed and likely restructured. This is not a project for the fourth quarter of 2026, when the Pillar Two rules become fully effective. This is a project for now, because restructuring takes time and the window for tax-efficient restructuring is closing.
For clients considering new GCC-EU structures, the analysis must be honest about the current environment. The structures that worked five years ago do not work now. The structures that work now may not work in two years. The only structures that make sense are those that create genuine economic value in the UAE, with real substance and real functions, and that are structured to be robust against the regulatory changes that we know are coming.
A client came to us in early 2024 with a proposal from a well-known advisory firm to establish a UAE holding company for a European family business. The proposal showed substantial tax savings based on the 9% UAE corporate tax rate, the Dutch participation exemption, and the treatment of the UAE as a favorable treaty jurisdiction. The proposal was written as if Pillar Two did not exist, as if the EU grey list did not matter, and as if the substance requirements of the free zones could be satisfied by hiring one administrative assistant.
We tore the proposal apart. We showed the client what the structure would actually look like under Pillar Two. We showed them the EU treaty limitations that would apply to payments from European companies to the UAE entity. We showed them the substance requirements they would actually have to meet, and the cost of meeting those requirements.
The client did not proceed with the proposed structure. Instead, we worked with them to develop an alternative approach that created genuine value in the UAE, with real substance and realistic expectations. The tax benefits are smaller than what the original proposal promised, but the structure is real, it is robust, and it will survive the regulatory changes coming in the next two years.
That is the trade-off that all clients must now make: smaller, real benefits, or larger, illusory benefits that will not survive contact with reality.
The window is closing. The question is whether you will act before it closes entirely.