The Ultimate NIE Spain Guide The Ultimate NIE Spain Guide NIE is Spain's foreign identification number required for: ✓ Opening a bank account ✓ Buying property ✓ Signing rental agreements ✓ Paying taxes ✓ Starting a business ✓ Applying for residency procedures 1. What the NIE Actually Is The NIE (Número de Identidad de Extranjero) is the unique identification number assigned to every foreigner in Spain. It is not a card, not a visa, not a residence permit — it is simply a num