SPAIN Law and Practice Contributed by: Cristina Alba and José María Rodríguez Hernández, act legal
fication of the action that gives rise, or may give rise, to treaty-inconsistent taxation. This is not uniform across all treaties, however, as the applicable MAP article may set a different time limit. For example, the Spain–Portugal DTT sets a two-year deadline, whereas the Spain–US DTT provides for five years. In practice, the relevant treaty provision should be reviewed at the outset to confirm whether the tax - payer is still within time. 8.3 Mandatory Binding Arbitration Mandatory binding arbitration is provided for in Spain in respect of specific cross-border tax disputes. At EU level, the mechanism may be triggered under the EU Arbitration Convention or the Tax Dispute Resolution Directive if the competent authorities fail to resolve the case within the prescribed time limits. These mechanisms are intended to secure a final res - olution and reduce the risk of double taxation remain - ing unresolved. In addition, Spain has opted to apply Part VI (Arbi - tration) of the MLI, although with reservations. As a result, binding arbitration may be available under cov - ered tax treaties where both contracting jurisdictions have made compatible elections. Spain’s participation is subject to certain reservations, including the exclu - sion of cases that have already or are being decided by domestic courts. Spain has developed a well-established APA pro - gramme ( acuerdos previos de valoración ) designed to provide clarity in advance on whether related-party transactions comply with the arm’s length principle. At its core, the programme allows companies to agree beforehand with the tax authorities on the method - ology used to price intra-group transactions. Spain offers unilateral, bilateral and multilateral APAs. A unilateral agreement may bring comfort domestically, a bilateral or multilateral one adds alignment across borders, which is often where transfer pricing disputes 9. Dispute Prevention 9.1 Advance Pricing Agreements
become most complex. For multinational groups, this makes the APA programme not just a compliance tool, but a strategic instrument for managing risk before it crystallises. The legal framework is primarily set out in the CIT Regulation (Royal Decree 634/2015). Importantly, this regulation goes beyond traditional transfer pricing APAs. It also provides for advance agreements con - cerning the valuation of research and development expenses and the qualification or valuation of income derived from certain intangible assets, including the patent box regime. The Spanish Tax Agency has added extensive proce - dural guidelines to the legal framework. This includes the prerequisites for qualifying, how to file, and an overview of the administrative process. The proceed - ings are handled by teams or Inspection Units desig - nated by the State Tax Agency’s Department of Finan - cial and Tax Audits, specialised in the matter. APAs remain valid for the tax periods specified in the agreement, provided that they do not exceed the four tax periods following the tax period in which the APA is approved. However, it may also be determined that its effects extend to transactions carried out in prior tax periods not affected by the statute of limitations. 9.2 Other Mechanisms Spain has developed several mechanisms designed to reduce tax uncertainty and prevent disputes. Binding Rulings (DGT) Taxpayers can request a written interpretation from the DGT. The ruling is binding not only on the taxpayer who requested it, but also on other taxpayers if there is identity between the facts and circumstances of the taxpayer concerned and those addressed in the ruling. These rulings are particularly useful in international contexts. Companies frequently seek clarification on issues such as whether a permanent establishment exists, how withholding tax should be applied, or whether treaty benefits are available. By obtaining an answer before implementing a transaction, taxpayers may reduce uncertainty and potential audit risk.
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