Luxembourg holding companies and Italian tax challenges: substance remains the decisive factor

A recent decision of the First Instance Tax Court of Milan provides an important reminder for multinational groups, private equity investors and cross-border holding structures: a foreign holding company should not be disregarded merely because it forms part of an international investment chain. What matters is whether the entity has genuine economic substance, effective decision-making autonomy and a corporate governance framework consistent with the functions it performs.

The case concerned an investment in an Italian company held through two Luxembourg holding companies. The Italian Revenue Agency challenged the structure, arguing that the Luxembourg entities were merely interposed vehicles and that the relevant capital gain should instead be taxed in Italy. In particular, the authorities sought to rely on the Italian rules allowing income formally attributed to one person or entity to be reallocated to another person where the formal holder is considered fictitiously interposed.

The Milan Tax Court rejected that approach. The decision is significant because it confirms that the analysis cannot stop at the legal form of the structure, nor can it be based on a presumption that Luxembourg holding entities are automatically artificial or abusive. Instead, the assessment must be factual and must consider whether the entities involved are capable of carrying out real functions within the investment structure.

The distinction between a holding company and a conduit

The use of holding companies is common in international investment structures, particularly in the private equity sector. Holding entities may be used for commercial, legal, financing, governance and exit-related reasons. However, in recent years, tax authorities across Europe have increasingly scrutinised such entities, particularly where they are located in jurisdictions with favourable treaty networks or established investment fund regimes.

The central question is therefore not whether a holding company exists, but whether it does anything meaningful.

A genuine holding company may have a relatively lean structure. It may not require extensive premises, a large number of employees or the operational footprint of a trading business. This is particularly true where its activity consists of holding and managing participations, making investment decisions, approving distributions, managing financing flows and supervising the investment. However, even a lean structure must still be capable of demonstrating that it has real governance, real functions and real autonomy.

By contrast, a conduit or fictitiously interposed entity is generally characterised by the absence of independent decision-making power, the automatic passing-on of income or sale proceeds, lack of genuine risk assumption, and a disconnect between the entity’s formal ownership and its actual role in the structure.

The Milan decision is useful because it reinforces this distinction. A modest level of physical and organisational substance does not, in itself, mean that a company is artificial. The relevant test is whether the structure is genuine when assessed in light of its purpose and functions.

The factors considered by the Milan Tax Court

In rejecting the Italian Revenue Agency’s position, the court placed weight on several factual elements.

First, the Luxembourg entities had their own offices and staff, even though the structure was not extensive. This is an important point: substance is not measured by size alone, but by adequacy. A holding company does not necessarily need the same resources as a trading company. What it needs is an infrastructure proportionate to its actual activity.

Secondly, the entities held regular board meetings and shareholder meetings. The involvement of experienced professionals, including Luxembourg-resident individuals, supported the view that governance was not purely formal. Properly convened and documented meetings remain a key part of demonstrating that the company’s organs are actually functioning.

Thirdly, the court noted that investment decisions and dividend distribution decisions were taken autonomously by the boards of the Luxembourg companies. This was particularly relevant because it showed that there was no pre-determined or automatic mechanism requiring proceeds to be immediately passed through to another party.

These points are consistent with the wider direction of European tax case law. Courts and tax authorities increasingly focus on where decisions are made, who makes them, whether those individuals have sufficient knowledge and authority, whether the entity bears genuine economic risk, and whether the profits retained are consistent with the functions performed.

Why the decision matters for private equity and multinational groups

The decision is particularly relevant for private equity structures, where investments are often held through intermediate holding companies for reasons connected with fund structuring, investor pooling, financing, regulatory considerations and exit planning.

The ruling should not be read as a general approval of all Luxembourg holding structures. It does not mean that any foreign holding company will automatically be respected for Italian tax purposes. Rather, it confirms that tax authorities must carry out a concrete analysis of the facts and cannot disregard an entity solely because it is a holding company or because its structure is comparatively light.

For multinational groups, the decision is also a reminder that substance should be built into the structure from the outset. It is not enough to prepare documentation only once a challenge arises. Board minutes, internal approvals, local decision-making records, financing documentation, evidence of risk assumption and proof of operational capacity should be maintained contemporaneously.

This is particularly important where the structure gives rise to significant tax outcomes, such as the application of treaty relief, exemption from withholding tax, participation exemption treatment or the allocation of taxing rights on a cross-border disposal.

Substance is no longer a formal checklist

The broader lesson is that substance cannot be reduced to a box-ticking exercise. Having a registered office, local directors or standard board minutes may not be sufficient if the actual decision-making takes place elsewhere. Equally, the absence of a large workforce should not automatically undermine a holding company if its resources are proportionate to its role.

A defensible structure should be able to show alignment between legal form and economic reality. This includes demonstrating that the entity has a clear commercial purpose, appropriate governance, access to competent decision-makers, control over its assets and income, and the ability to make decisions without being subject to automatic instructions from another group entity or investor.

For holding companies, this may require particular attention to the following areas:

• the composition and authority of the board;

• the location and quality of board decision-making;

• the existence of local administrative and accounting support;

• the maintenance of corporate records in the jurisdiction of residence;

• the entity’s ability to assume and manage risk;

• the absence of automatic pass-through arrangements;

• consistency between legal documentation, financial statements, transfer pricing analysis and actual conduct.

Practical considerations

Groups using Luxembourg or other foreign holding companies should review whether their structures remain robust when tested against current substance expectations.

In particular, they should consider whether board decisions are genuinely taken at the level of the holding company, whether directors have access to adequate information before approving transactions, and whether minutes properly record the commercial rationale for investment, financing and distribution decisions.

They should also ensure that any outsourcing arrangements do not undermine the company’s autonomy. Outsourcing administrative, accounting or corporate services is not inherently problematic. However, the holding company must retain the ability to supervise those services and make the key decisions itself.

Where significant disposals or distributions are expected, the position should be reviewed in advance. This is especially relevant in the context of private equity exits, where the quantum of the gain may attract detailed scrutiny from tax authorities.

Final considerations

The Milan Tax Court decision is a positive development for taxpayers using cross-border holding structures, but it is not a safe harbour. It confirms that foreign holding companies can be respected where they are genuine, properly governed and functionally appropriate. At the same time, it reinforces the importance of maintaining evidence that substance exists in practice, not only on paper.

For multinational groups and private equity investors, the key message is clear: international structures remain defensible where they reflect commercial reality. Substance, governance and decision-making autonomy should therefore be treated as essential components of tax risk management, not as administrative formalities.