Introduction
A few months ago, in this article, we analysed a court judgement that corrected the Spanish Tax Authority’s (Hacienda) interpretation regarding family businesses and the Wealth Tax (el Impuesto sobre el Patrimonio, “IP”) exemption. This ruling already touched on a fundamental point that must be kept in mind: when the reality of the business is clear, tax interpretation cannot be based on rigid formalities that ultimately render the tax benefits, designed precisely to protect the continuity of the family business, meaningless. Well, the taxation of family businesses is once again at the centre of the debate.
This time, it is the Third Chamber of the Spanish Supreme Court that has reaffirmed and strengthened the same doctrinal approach, this time in relation to the Inheritance and Gift Tax (Impuesto sobre Sucesiones y Donaciones, “ISD”). And it does this in an area of high practical relevance for many family businesses: the application of the 95% reduction in the taxable base of the ISD, a tax benefit that was in fact designed to preserve the continuity of family business assets.
The recent Spanish Supreme Court (Tribunal Supremo) rulings no. 167/2026 of the 17th February and no. 186/2026 of the 19th February 2026 establish an important doctrine of practical relevance, strengthening legal certainty for taxpayers and, once again, curbing the Tax Agency’s overly formal interpretation.
Legal framework
The ISD Act, in Article 20.6, provided for a 95% reduction for inter vivos transfers of shareholdings in entities to, among others, descendants, provided that the exemption set forth in Article 4.8.2 of the Wealth Tax Act applies. In turn, this provision refers to the Personal Income Tax Act (Ley del IRPF, “LIRPF”) to determine whether economic activity exists and whether the assets are allocated to that activity.
Specifically, with regard to the leasing of real estate, Article 27.2 of the LIRPF establishes specific criteria requiring a minimum organisational structure, particularly the requirement to have a full-time employee with an employment contract in order to establish that economic activity is taking place. Below, we will analyse the dispute and interpretations of the Tax Authority and the Supreme Court in this regard.
The dispute: The Tax Authority artificially fragments the reality of the family business.
The dispute at the heart of the two aforementioned Supreme Court rulings stemmed from the granting, in December 2014, of ten shares in AMB Corporación Empresarial, S.L. by a married couple to two of their children.
The recipients of the shares filed their self-assessment returns, applying the reduction to which they were entitled under Article 20.6 of the aforementioned ISD Act.
The Tax Agency’s Inspection Office in the Region of Murcia (the “Inspection Office”) partially denied this reduction, on the understanding that one of the subsidiaries of the group (hereinafter, the “Subsidiary”), which was engaged in the leasing of agricultural land, was not carrying out any economic activity because it did not directly employ a full-time worker (Article 27.2 of the LIRPF). On that basis, it classified part of the holding company’s assets as not connected with the economic activity, applied the proportionality rule and reduced the exempt percentage to 74.67%, issuing an additional tax assessment.
The Administration’s argument was simple but deeply contrived: even though the actual management of the business was centralised in other entities belonging to the group, the fact that the business leasing the agricultural land had hired the worker directly was decisive for applying the tax reduction.
This fragmented vision of business reality goes against the commercial and organisational logic within which the majority of corporate groups operate, as well as being contrary to the purpose of the tax benefit, since, when the leasing company is effectively and functionally integrated in the group’s economic activity, the workforce comes to serve the group as a whole, regardless of which specific company is formally listed as the employer of the staff.
The Supreme Court’s ruling: The economic reality of the group prevails when there is effective joint organisation of resources.
The Supreme Court corrects that approach. And it does so with a very clear idea: what matters most is not which business is employing the worker full-time, but whether an “effective joint organisation of resources” exists.
In the case in question, the business at the centre of the controversy, the Subsidiary, was responsible for leasing agricultural land, with or without irrigation heads installed. However, the Supreme Court emphasised that this activity could not be viewed in isolation nor as merely the passive leasing of land. From the contracts examined by the Inspection Office, it emerged that in addition to leasing the land, the tenants also undertook to contract a series of complementary services linked to the agricultural operation: in some cases, through companies belonging to the same group, such as a subsidiary that invoiced them for a water fee and, in other cases, they were provided by third-party companies, for example for the supply of seeds or for the provision of qualified technicians and irrigation workers. Furthermore, the group employed more than forty workers in total, so the fact that the leasing Subsidiary had no employees of its own did not in any way negate the existence of a genuine economic activity organised at the group level.
Thus, the Supreme Court holds that the activities of said Subsidiary cannot be analysed in isolation or reduced to mere real estate leasing, but must be viewed as an integral part of the overall set of resources, assets and services organised by the group to carry out a genuine economic activity. And it is this functional integration in the group’s activities, rather than the formal nature of the employment contract, that leads the chamber to conclude that the requirement of Article 27.2 of the LIRPF must be deemed satisfied for the purposes of applying the 95% reduction in ISD.
However, the Supreme Court does not hold that mere formal membership in a group of companies is sufficient, but rather, it requires that the company in question be effectively and functionally integrated into the economic activity carried out by the group as a whole.
The purpose of protecting generational succession in family businesses
The Supreme Court introduces another interesting aspect in its judgement, adopting a clearly purposive approach: the Third Chamber links the interpretation of the tax benefit to the purpose of protecting family businesses and to European recommendations aimed at avoiding obstacles to generational succession through tax burdens or unnecessary bureaucratic requirements. In this vein, it emphasises that the organisational structure chosen to ensure business continuity should not be penalised for tax purposes when genuine activity exists. The Chamber is especially categorical in its rejection of a “purely formal and isolated” interpretation of the law. And it is quite right. Turning a technical requirement into a tax-raising pitfall, while ignoring the group’s genuine structure and operations, undermines the purpose of the tax system for family businesses and creates legal uncertainty for taxpayers.
Practical implications
The main practical lesson from these rulings is that, when it comes to family businesses, it is not enough to consider each of the group’s companies in isolation. Rather, one must take into account the reality of the economic activity carried out by the group as a whole. The doctrine applied in these rulings strengthens the position of family groups that centralise administrative, financial, or managerial functions in specific companies belonging to the group, sharing staff, facilities and resources. From now on, the Administration should not automatically deny the reduced ISD rate and, by extension, Wealth Tax exemptions simply because a company belonging to the group does not have its own workforce, so long as it can demonstrate genuine functional integration in the group’s economic activity.
The conclusion is clear: the Supreme Court emphasises once again that taxation cannot be based on formal fictions when the economic reality says otherwise. It is undoubtedly an important decision for family businesses. Likewise, decisions serve as an important check on the tax authorities who, too often, opt for the interpretation that is most burdensome on the taxpayer, relying on the fact that only those with the time, resources and determination will take their case to court to ensure an application of the law that is consistent with its true purpose.
Julio González
Vilá Abogados
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13th March 2026
