SPAIN Law and Practice Contributed by: Cristina Alba and José María Rodríguez Hernández, act legal
1. Sources and Principles 1.1 Domestic Sources of International Tax Law Spain’s foreign tax system is based on a defined hier - archy of legal sources, such as constitutional princi - ples, local laws, EU law, and a network of treaties. The Spanish Constitution sets out the main charac - teristics of the tax system, which include principles such as legality, equality, economic ability, progressiv - ity, and the prohibition of confiscatory taxation. The Constitution also legislates on how international treaties can become part of domestic law. Once con - cluded, ratified and officially published in the Official State Gazette (BOE), treaties are incorporated into the internal legal framework without necessitating further implementing legislation. The General Tax Law (GTL) establishes the main rules for the interpretation, administration, and enforcement of tax-related issues. Administrative interpretation holds significant importance in Spain, with two clear examples. • Binding rulings issued by the Directorate General of Taxes (DGT): in general, rulings are binding not only on the taxpayer who requested them, but also on other taxpayers if there is identity between the facts and circumstances of the taxpayer concerned and those addressed in the ruling. As such, they are frequently used as guidance to align criteria with the Tax Administration. • Rulings of the Central Economic-Administrative Court (TEAC): the criteria set forth by the TEAC, which are binding on the Tax Administration, play a crucial role in influencing administrative practice and maintaining a level of uniformity throughout the region. EU law is an important feature of the Spanish tax system because the Spanish Constitution recognis - es that some powers can be transferred to the EU. Consequently, EU laws and the basic freedoms of the internal market affect not only cross-border taxation, but also the exchange of information, anti-avoidance
measures, State aid control, and tax dispute resolu - tion mechanisms. Spain has concluded a large number of treaties that involve more than 90 countries around the world and are mostly in line with OECD criteria. These agree - ments play a key role in international tax planning and in managing cross-border risks. The Spanish Tax Agency has an official database of treaty texts and related protocols, which can be accessed here . 1.2 Hierarchy of Sources Once duly concluded and published in the BOE, inter - national treaties in Spain become part of the domestic legal order and, when drafted with sufficient precision, may be directly invoked before Spanish courts and tax authorities alike. Article 7 of the General Tax Law sets out the hierarchy with notable clarity. At the summit stands the Consti - tution. Alongside it are international treaties, including double taxation treaties (DTTs). These are followed by EU and other supranational rules, then domestic tax laws and implementing regulations. Law 25/2014 on treaties strengthens this order. Trea - ties that are duly signed and published are binding on all public administrations and take precedence over conflicting domestic legislation (save for constitutional principles). Where there is conflict between treaties and domestic law, Spanish practice usually gives precedence to the treaty, and courts usually settle such issues by interpreting and applying the relevant treaty instead of allowing more recent domestic leg - islation to prevail. Yet within this layered system resides a legal force that both integrates and transforms it: EU law. In cross- border tax matters within the EU, domestic rules and tax treaties must be applied consistently with EU law, including the principle of primacy and the stipulations derived from directives and the case law of the Court of Justice. EU regulations apply directly; directives, as a rule, require transposition into the Spanish legal system. A recent Supreme Court judgment (12 January 2026) illustrates this interplay in an intra-EU royalty case.
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