The banks are required to comply with applicable laws in Spain (Royal Decree 10/2010). After new situationthe tax number is very important because in recent times, they are already sold in the banking products, in which, although not tax resident foreigners coming into contact with the Spanish tax in touch.
These include banking products
- Insurance in Spain
- phone contracts
- current accounts
Traditional investment products are indeed of the Spanish tax exempt (withholding tax), but as mentioned above by the foreigners coming into contact with the Spanish tax tax number is mandatory.
If you with opening a bank account in Spain because of unavailable Spain tax number (NIE Numero de Identificacion de Extranjeros) have problems, ask the bank employees but to open the account and yet submit the tax number.