Portugal Freelancer Tax Deadlines 2026: The Complete Month-by-Month Calendar

As a freelancer in Portugal, you face deadlines from three separate entities: the tax authority (AT), Seguranca Social, and your own invoicing obligations. Missing any deadline results in fines from EUR 150 to EUR 3,750. This calendar puts every 2026 deadline in one place so nothing falls through the cracks.

How to use this calendar

January 2026

February 2026

March 2026

April 2026

May 2026

June 2026

July 2026

August 2026

September 2026

October 2026

November 2026

December 2026

What happens if you miss a deadline?

First year in Portugal? What applies to you

Recurring monthly deadlines

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