Getting a NIF (Número de Identificação Fiscal) number in Portugal for non-residents is essential for various legal and financial activities, such as opening a bank account, purchasing property, or starting a business. Non-residents can obtain an NIF by visiting a local tax office or through a representative in Portugal. You'll need to provide identification, proof of address, and possibly other documents depending on your situation. The process is straightforward, and the NIF is required for anyone engaging in activities that require formal interaction with the Portuguese tax system.