Web portals for TIN (NIF) validations
To facilitate the process of validating the NIF included in the tax residence declaration, the following portals are provided where you can consult the information for each country in relation to the issuance, obtaining and, where applicable, structure and operation of the corresponding NIF:
Tool to validate TIN structure and syntax in EU of natural persons List of TIN structure of EU countries TIN structure in AEOI portal