Alternative to Portugal NIF

https://www.e-resident.gov.ee/
E-residency gives you a personal code which can be used also as a tax number (it will be considered your Estonian TIN). On top of that you can access other digital services, e.g., you can register a company, branch or PE in Estonia.
 
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You need like 65K capital, right? Can it be reduced?
No need for capital, but some substance is required (for the host entity and its establishments in both countries) with reference to Article 7 of the relevant EU directive:

Article 7
1. Member States shall reject an application for an intra-corporate transferee permit in any of the following cases:
(c) where the host entity was established for the main purpose of facilitating the entry of intra-corporate transferees;

Find more information here:
https://eur-lex.europa.eu/legal-con...CELEX:32014L0066&qid=1695031924363#d1e946-1-1