The Supreme Court’s new ruling represents a significant step forward in ensuring equal tax treatment between residents and non-residents with regard to wealth. It reinforces the need to interpret domestic regulations in accordance with the principles of free movement of capital and non-discrimination.
The Supreme Court has established a highly significant precedent in the area of international wealth taxation by recognizing that taxpayers who are not resident in Spain cannot be excluded, solely on the basis of their tax residence, from the application of the joint wealth tax limit.
This legal doctrine, set forth in the rulings of October 29 and November 3, 2025, has already been reflected in legislation through Order HAC/277/2026, which adapted the tax return form to this new jurisprudential standard.
Until recently, the application of the total tax liability limit provided for in Article 31.1 of Law 19/1991 of June 6 on Wealth Tax was understood to apply only to taxpayers subject to the tax by personal obligation, that is, to residents.
In other words, the law aims to prevent a person from having to allocate an excessive portion of their annual income to the combined payment of personal income tax and wealth tax. Therefore, if the sum of both taxes exceeds 70% of the income earned during the year, the wealth tax liability may be reduced, although such a reduction cannot exceed 80% of that tax.
The purpose of this rule is to prevent the combined taxation of income and wealth from resulting in disproportionate outcomes. The issue is that this legal protection previously applied only to tax residents in Spain, even though non-residents subject to taxation by actual obligation may also bear a significant wealth tax burden on their assets and rights located in Spanish territory. The novelty of 2025 lies in the fact that the Supreme Court has rejected this difference in treatment.
The legal doctrine has been established in two Supreme Court rulings, dated October 29, 2025, and November 3, 2025, both issued in appeals. The Administration has accepted the scope of these rulings, to the extent that the Wealth Tax return form has been expressly adapted to this criterion.
The new criterion is that habitual residence, whether in Spain or abroad, does not justify the differential treatment consisting of denying non-residents the application of the limit on the total tax liability provided for in Article 31 of the Wealth Tax Law.
The significance of these rulings extends beyond their immediate practical effect. The reasoning used is particularly relevant. The Supreme Court links the issue to the free movement of capital and relies on the case law of the Court of Justice of the European Union, in particular the judgment of September 3, 2014, Case C-127/12, which declared the less favorable tax treatment afforded in Spain to non-residents in the area of Inheritance and Gift Tax to be contrary to EU law.
That same judgment led to legal amendments to align the treatment of residents and non-residents in matters of wealth.
The central idea is clear: if the objective of the limit is to prevent excessive taxation of wealth relative to income, that purpose does not automatically disappear simply because the taxpayer is a resident or non-resident in Spain.
The significance of this doctrine is evident: first, it will affect future self-assessments of the Wealth Tax, as the jurisprudential criterion has been incorporated into the official tax return form.
Second, it opens the possibility of reviewing past situations in tax years not yet time-barred where the non-resident taxpayer was taxed without applying the now-recognized limit.
It should be noted that this case law may have implications beyond the Wealth Tax.
