> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.anchorless.io/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Why do I need a Portuguese Birth Certificate?

If you are a dual citizen or were born outside Portugal to Portuguese legal guardians, you'll need your Portuguese birth certificate to request a NIF.

Portuguese citizens must present their Portuguese birth certificate to request their NIF, as without it Finance (Finanças) won't accept your request.

[Start my Birth Certificate application now](https://anchorless.io/product/get-your-birth-certificate/apply/init)