NIF (Número de Identificación Fiscal) This is the generic term for the tax ID number for all individuals. For Spaniards, it's the DNI plus one letter; for foreigners, it is your NIE. If you're a nonresident who has to pay taxes in Spain, you may get a NIF issued to you without having a NIE. This, of course, does not mean you get automatic residency in Spain, nor will it make it easier to get residency.