How to Register as a Freelancer in Portugal: Abrir Atividade Step-by-Step (2026)

Before you can issue your first invoice (recibo verde) in Portugal, you need to officially register your freelance activity with the tax authority. In Portuguese, this is called abrir atividade (opening an activity). The entire process is done online through Portal das Financas — but the portal is entirely in Portuguese. This guide walks you through every step in English.

What is abrir atividade?

What you need before you start

Step 1: Log in to Portal das Financas

Step 2: Choose your activity code (CAE or CIRS)

Step 3: Choose your tax regime

Step 4: VAT regime selection

Step 5: Submit and confirm

After registration: what happens next

Social security registration (NISS)

Common mistakes to avoid

Skip the Portuguese paperwork. Join the VerdeDesk waitlist — issue recibos verdes, track your income, and stay compliant in plain English.