Setting up in Portugal: the first five steps

From tax number to bank account, the order that saves weeks.

Obtain a Portuguese tax number (NIF); non-residents usually need a fiscal representative.
Choose the company form (e.g. Lda or Unipessoal Lda) with your lawyer or accountant.
Register the company and its activity code (CAE).
Open a business bank account; prepare KYC documents in advance.
Appoint a certified accountant (contabilista certificado) for filings.

General information, not professional advice. Confirm with the relevant authority or adviser.