## Notes Three types of tax ID numbers (Número de Identificación Fiscal) - Número de Identidad de Extranjero (NIE) - ID number for all foreign residents and non-residents living or conducting tax-related business in Spain - Documento Nacional de Identidad (DNI) - ID number for Spanish nationals - Business NIF - tax ID for companies - Número de Seguridad Social (SSN) - for work or for accessing social security ## References - [ID Numbers in Spain - Expatica](https://www.expatica.com/es/living/gov-law-admin/nie-number-in-spain-849449/#businessid)