Anexo B (Annex B) IRS Portugal: Complete Field-by-Field Guide in English for Freelancers (2026)

Anexo B is the tax annex every freelancer in Portugal must submit alongside their IRS Modelo 3 return. It covers Category B income — self-employment and professional activity. The form is entirely in Portuguese on Portal das Financas, and there is no official English translation. This guide translates every field and walks you through filling it out correctly.

What is Anexo B?

Who needs to file Anexo B?

Before you start: what you need

How to access Anexo B on Portal das Financas

Field-by-field guide to Anexo B

How the simplified regime tax calculation works

Common mistakes on Anexo B

Anexo B for international clients only

After submitting: what happens next

IRS Automatico: can freelancers use it?

Quick reference: Anexo B checklist

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