Supreme Court Ends Discrimination: The IRPF–Wealth Tax Cap Applies to Non-Residents

Supreme Court ends historic discrimination: the IRPF–Wealth Tax cap now applies to non-residents

The Supreme Court has taken a decisive, long-awaited step towards cross-border taxation that is more consistent with EU law. In two consecutive judgments (STS 1372/2025 and STS 1402/2025), it ended a legal inequality that had placed non-residents at a clear disadvantage under Spain’s Wealth Tax. Its message is clear: the combined personal income tax and Wealth Tax cap cannot be reserved for residents because its purpose is to prevent confiscatory taxation, not to grant a personal benefit based on residence.

The rulings mark a major doctrinal shift and correct a practice that legal scholars and international tax analysts had repeatedly criticised. Spain had remained an anomaly in the EU: one of the few states taxing non-residents on Spanish assets without allowing a safeguard against confiscatory effects where they were taxed under limited tax liability. The Court aligns domestic law with established CJEU case law on the free movement of capital, a freedom that also extends to non-EU countries.

A bold ruling in an area long shaped by administrative inertia

For more than a decade, the Tax Agency maintained an approach that created a different tax scale based solely on residence, at odds with equality and the logic of the tax. The Supreme Court rejects the confusion between “personal tax liability” and the nature of the charge. Residents and non-residents are taxed on the same taxable event: owning assets located in Spain. Denying one group an anti-confiscation mechanism was therefore legally untenable.

The judgments also make a broader point. If Wealth Tax is meant to prevent excessive charges from irrationally absorbing a taxpayer’s income, that objective cannot depend on tax borders. The logic against confiscatory taxation is universal.

Practical impact: legal certainty and equal treatment

This is a significant step forward. International tax experts had long warned that Spain risked reputational damage by maintaining a Wealth Tax burden that could be far higher for a non-resident than for a resident with the same assets. In a property market partly driven by foreign investment—including high-value homes, second residences, commercial premises and financial assets—the new doctrine improves predictability, a key feature of international tax planning.

It also recognises that Spain’s current Wealth Tax design can produce near-confiscatory outcomes, especially for non-productive assets or assets with low returns, and that the rules need safeguards to prevent distortions.

Additional arguments supporting the Supreme Court

Academic studies and specialist publications on European taxation have highlighted several points:

1. Spain was the only EU country requiring non-residents to pay Wealth Tax without giving them an equivalent anti-confiscation cap, raising proportionality concerns under CJEU case law, including Hollmann and other wealth tax cases.
2. Since 2018, the European Commission had identified a risk of discrimination in how Wealth Tax applied to non-residents in several Country Reports, although it did not open formal infringement proceedings.
3. At international forums such as STEP, IFA and the Tax Foundation, analysts have described Spain’s Wealth Tax as poorly aligned with ability-to-pay principles in cross-border situations, partly because non-residents lacked the cap.
4. The OECD report Taxation of Household Savings says wealth taxes should include objective safeguards against excessive burdens on illiquid assets, consistent with the Supreme Court’s reasoning.

The Court appears to reflect these concerns indirectly, while grounding its decision in legal principles.

A step forward, with issues still to resolve

The ruling does not solve every structural problem with Wealth Tax. It corrects clear discrimination but leaves open questions such as:

• Differences in regional rules applicable to non-residents, depending on the territory.
• The coexistence of the state Wealth Tax with the temporary Solidarity Tax on Large Fortunes.
• Uncertainty around the interaction between Wealth Tax and double-tax treaties, particularly where assets include complex corporate holdings.

Even so, the Supreme Court’s doctrine points towards a more reasonable Wealth Tax system with fewer disputes. Above all, it sends a clear message: tax residence cannot be used to justify disproportionate charges under a tax that requires safeguards against confiscatory effects.

Read the original article in Spanish.