As the end of the current tax cycle approaches and with the commencement of the 2026 tax year, the doctrine consolidated by the Central Economic-Administrative Tribunal (Tribunal Económico-Administrativo Central – TEAC) requires a rigorous reassessment of the criteria governing the determination of tax residence in Spain for 2026, based on an objective evaluation of facts in which “substance prevails over form. Physical presence in Spain constitutes the primary factual element for residence purposes.”
The TEAC’s resolution of 22 May 2025, although formally focused on the inapplicability of a Double Tax Treaty in the context of special foreign tax regimes, confirms a structurally relevant principle: tax residence must be determined primarily under Spanish domestic law, and only subsequently, where appropriate, under treaty provisions. This approach places Article 9 of Law 35/2006 (LIRPF) at the core of the analysis and reinforces the primacy of factual elements over formal residence claims.
The assessment of whether an individual remains in Spanish territory for more than 183 days must be carried out through an objective reconstruction of presence, independent of formal declarations, subjective intent, or foreign residence certificates.
Looking ahead to 2026, it is particularly relevant that the criterion applied by the Spanish Tax Administration is to compute all days of the calendar year in order to determine whether the statutory threshold has been exceeded.
In accordance with the TEAC’s settled case law, this computation does not require continuous or uninterrupted stays, nor a minimum duration of daily presence. Each day of presence that can be objectively established is counted in full. Likewise, days reasonably inferred between proven presences and, where relevant, sporadic absences may be integrated into the overall assessment, in line with the Tribunal’s doctrinal construction of the concept of “permanence”.
This legal framework must now be read together with the strengthening of entry and exit controls at external borders, in particular through the EU Entry/Exit System (EES) implemented at customs and border checkpoints. The EES introduces automated, centralised registration of the dates (and times) of entry and exit of third-country nationals into and out of the Schengen Area. While formally designed for migration and border-management purposes, these records constitute objective, highly reliable evidence of physical presence, which may be used by tax authorities to verify and reconstruct days of presence in Spanish territory.
The coexistence of the TEAC’s evidence-based doctrine and the new customs control mechanisms significantly reduces the margin for uncertainty in residence determinations. From a practical standpoint, it reinforces the Administration’s ability to contrast taxpayer statements against independent, digital and cross-border data sources.
Finally, the 2025 TEAC resolution reiterates that treaty-based residence arguments are subsidiary in nature. Double Tax Treaties and their tie-breaker rules cannot be relied upon to displace Spanish internal law unless the substantive conditions for treaty residence are met. Where such conditions are absent, Spanish law applies autonomously, based on factual presence and economic reality.
In conclusion, for the purposes of determining tax residence for 2026, the decisive reference period is the entire calendar year, assessed through a comprehensive, objective and evidence-driven analysis of physical presence in Spain. The combination of consolidated TEAC doctrine and enhanced entry controls confirms the predominance of substance over form in the Spanish concept of tax residence.
** The information in this article is of a general nature and does not constitute professional advice or consultancy for a specific case, whether legal or tax-related.
https://serviciostelematicosext.hacienda.gob.es/TEAC/DYCTEA/criterio.aspx?id=00/08144/2022/00/00/1
