The "Número de Identidad de Extranjero" (NIE) is an all-purpose ID and tax number in Spain, required to buy property and get a mortgage in Spain.When living abroad, you have three ways to apply for the NIE number:1. In person in Spain2. In person via a Spanish Consulate abroad3. Through a representative in Spain (someone that does it for you that is physically in Spain).You'll need these documents when applying for the NIE number:• Two copies of the Ex-15 application form filled out and signed (found on the website linked below).• An original document (and extra copy) that explains the reason for applying for an NIE number, e.g. a purchase contract for a property, or a mortgage application.• Passport and a photocopy of the main page of your passport (the page with name, photo etc.).If you want to read more about the NIE number application you can find information here: NIE application information. We recommend you to get in touch with your local consulate before proceeding to check the latest guidelines regarding applying for the NIE as processes and instructions may change over time.