NIF, 'Número de Identificação Fiscal', 'Número de Contribuinte', or just 'Contribuinte', is the main ID for any resident in Portugal or those seeking to manage assets in the country. It consists of a 9-digit numbe
It's a tax identification number granted by Portuguese tax authorities (aka 'Finanças'), that allows anyone to domicile their taxes in Portugal, and you don't need to be a resident to request one. The NIF is by far the most requested ID for any service in Portugal.
Each person and each company are assigned a NIF, which will last indefinitely.
If you want to live in Portugal or plan to have financial assets here, the NIF will be your main need.
Where will I use a Portuguese NIF?
Besides serving as a governmental ID, the Portuguese NIF is required in the following situations:
First step to becoming a Portuguese resident as an EU citizen