A foreign company with operations in Spain may face significant financial penalties if it misses the new tax reporting deadlines that took effect in early 2025. Spain's tax authority, the Agencia Tributaria (Spanish Tax Agency), has expanded its information exchange and reporting obligations for non-resident entities. The changes affect a broad range of structures, from permanent establishments to passive income recipients.
Spain's updated tax legislation introduced new mandatory reporting obligations for foreign entities receiving income from Spanish sources or holding assets in Spain, effective from the 2025 tax year. Non-resident companies must now file enhanced disclosure returns alongside their existing corporate income tax and withholding tax declarations. Failure to comply before the applicable filing deadline may trigger automatic penalty proceedings under Spanish tax legislation.
This alert outlines the scope of the change, the business categories affected, and the concrete steps foreign entities should take now.
What has changed and when it applies
Spain's legislature amended its non-resident income tax rules and related reporting obligations as part of a broader push toward fiscal transparency aligned with EU directives on administrative cooperation. The changes apply to fiscal years commencing on or after 1 January 2025.
Three areas have been materially revised. First, the threshold for mandatory disclosure of Spanish-source income has been lowered. Foreign entities that previously fell below the reporting trigger must now assess whether their revised position requires a filing. Second, the information required within each return has been expanded. Entities must now provide granular detail on the nature of payments received, the identity of Spanish-paying agents, and the basis for any tax treaty relief claimed. Third, enhanced due diligence is required around permanent establishment determinations. A foreign entity that disputes PE status must now affirmatively document that position in its annual filing rather than relying on silence.
The Tribunal Supremo (Supreme Court of Spain) has in recent years reinforced a broad interpretation of what constitutes a fixed place of business in Spain. Practitioners note that digital service models and remote-working arrangements have increasingly been scrutinised as potential PE triggers. The 2025 changes codify much of this case law into the reporting rules.
Entities structured through a Sociedad Anónima (SA) or Sociedad de Responsabilidad Limitada (SL) that are majority-owned by non-resident shareholders now face additional disclosure duties regarding intra-group payments and royalty flows. Registration details held at the Registro Mercantil (Commercial Registry) will be cross-referenced against tax filings as part of the Agency's automated compliance checks.
Who is affected: threshold criteria and business categories
The new obligations apply to any foreign entity that falls into one or more of the following categories during the 2025 fiscal year.
- Non-resident companies receiving dividends, interest, royalties, or capital gains from Spanish-source assets above the revised disclosure threshold.
- Foreign entities with a permanent establishment in Spain, whether or not they consider that establishment to be tax-resident.
- Non-resident holding structures that own Spanish real estate directly or through an intermediate vehicle.
- Foreign groups that have designated a Spanish subsidiary as the local filing agent for cross-border arrangements reportable under DAC6 or similar transparency rules.
- Entities claiming full or partial exemption under a tax treaty between Spain and their jurisdiction of incorporation.
The tax residency status of the ultimate beneficial owner is now a mandatory disclosure field. Where an entity cannot demonstrate that its beneficial owner is resident in a jurisdiction with which Spain has an active treaty, the withholding tax rate applied by default is the domestic non-treaty rate. This is a material change for structures interposed between a Spanish asset and an ultimate owner in a high-tax jurisdiction that has historically relied on treaty benefits through an intermediate holding company.
Foreign entities with no physical presence in Spain but receiving passive income – for example, interest payments from a Spanish borrower – are not exempt. The paying agent in Spain bears a secondary reporting obligation, but the foreign recipient remains responsible for its own compliance position.
For a tailored strategy on corporate income tax and non-resident obligations in Spain, reach out to info@ferrazwhitmore.com.
Immediate actions: what international companies must do now
The primary filing deadline for non-resident entities for fiscal year 2025 falls in the first quarter of 2026. Depending on the type of income and the applicable return, the deadline ranges from January to the end of March 2026. Entities that have not yet reviewed their position should treat this as urgent.
The following action items apply to most affected foreign entities.
- Audit existing Spanish-source income streams. Identify every payment received from a Spanish-resident payer during 2025. Categorise each stream by type – dividend, interest, royalty, service fee – and confirm whether the withholding tax applied at source was correct under the applicable treaty or domestic rate.
- Re-assess permanent establishment exposure. If your entity has staff, equipment, or contracts operating in Spain, obtain a formal PE analysis. The documentation threshold under the 2025 rules is higher than before. A Notario-certified corporate resolution alone is no longer sufficient to rebut a PE allegation.
- Review treaty entitlement documentation. Certificates of tax residency must be current – typically dated within the 12 months preceding the filing date. Out-of-date certificates will not support a treaty rate claim and may result in retroactive reassessment at the domestic withholding rate.
- Check Registro Mercantil filings for Spanish subsidiaries. If you hold a Spanish SA or SL, verify that its registered details – address, directors, share capital – are consistent with what will appear in the tax filing. Discrepancies between registry data and tax returns are one of the Agency's primary audit triggers.
- Assess DAC6 and similar cross-border arrangement reportability. If any intra-group arrangement involving a Spanish entity was restructured or entered into during 2025, confirm whether it falls within the mandatory disclosure regime. Late filings under this regime carry separate and substantial penalties.
Companies already working with Spanish tax counsel should request a gap analysis against the 2025 rule changes. Our tax law practice in Spain advises international groups on non-resident compliance, treaty structuring, and Agency correspondence. For broader corporate structuring questions – including the corporate law implications of holding structures and subsidiary governance – our corporate law practice in Spain works alongside the tax team to deliver integrated advice. Companies operating across the Iberian Peninsula should also review the parallel developments covered in our 2025 tax reporting alert for Portugal.
To receive an expert assessment of your non-resident tax position in Spain, contact us at info@ferrazwhitmore.com.
About Ferraz & Whitmore
Ferraz & Whitmore is an international law firm based in Lisbon, advising business clients across 46 jurisdictions. As a law firm in Spain and across the Iberian Peninsula, our team combines Portuguese civil law expertise with English common law tradition to deliver cross-border tax and corporate solutions. Our tax law practice covers non-resident compliance, permanent establishment disputes, withholding tax reclaims, and treaty structuring for international groups with Spanish operations. The firm's Lisbon base provides direct access to both Portuguese and Spanish regulatory systems, while our common law expertise supports enforcement and arbitration strategies in English-speaking jurisdictions. Practitioners on our team have advised international clients before the Agencia Tributaria and in proceedings before the Spanish administrative tax tribunals. Engaging a lawyer in Spain with cross-border experience is particularly important when the new reporting rules touch on treaty positions that span multiple jurisdictions. To discuss your non-resident tax compliance position in Spain, contact us at info@ferrazwhitmore.com.
Disclaimer: This publication is provided for informational purposes only and does not constitute legal advice. The information herein should not be relied upon as a substitute for professional legal counsel tailored to your specific circumstances. Ferraz & Whitmore assumes no liability for actions taken or not taken based on the contents of this material. For advice regarding your particular situation, please contact info@ferrazwhitmore.com.