Tax Calendar 2026: Key Tax Obligations for Businesses

Meeting your tax obligations on time is essential to avoid penalties, interest charges, and other unnecessary costs. Understanding the 2026 Tax Calendar enables businesses to plan the year with greater confidence and ensure compliance with all applicable tax obligations.

Some changes take effect as early as January, while others have been postponed. Nevertheless, it is important to be aware of these developments so that your business can prepare and adapt accordingly.

Below, we highlight the key tax developments for 2026.

Tax Calendar 2026: Key Information

It is essential for all taxpayers to stay informed about changes to tax legislation.

For business owners and company directors, however, this is particularly important to ensure that no tax obligations are overlooked.

This is why working with a trusted Certified Accountant is so valuable. An experienced professional can help your business adapt to legislative changes and remain fully compliant with Portuguese tax regulations.

Some of the measures applicable in 2026 are not entirely new. Although they were announced several years ago, their implementation was postponed due to the impact of the COVID-19 pandemic.

Below are some of the most significant changes included in the 2026 tax agenda.

Changes to VAT Exemption Codes

The Portuguese Tax and Customs Authority (Autoridade Tributária e Aduaneira – AT) has standardised the VAT exemption codes to support the automatic reporting of electronic invoices.

As part of this process, new exemption codes have been introduced, together with updated services for reporting:

• Invoices and customer advance payments;
• Working documents;
• Document status updates (“Normal”, “Invoiced”, and “Cancelled”);
• Cash VAT receipts.

Self-Employed Individuals: Higher VAT Exemption Threshold

For the 2026 tax year, the VAT exemption threshold for self-employed individuals is €15,000.

Electronic Invoicing in Public Procurement

Electronic invoicing has been mandatory for SMEs and micro-enterprises supplying goods or services to the Portuguese public sector since 1 January 2023, and its implementation continues throughout 2026.

For the complete monthly tax calendar, please consult the Portuguese Tax and Customs Authority’s Tax Calendar in this link.

Would you like to know whether your business is affected by these changes? Contact us to find out how the 2026 tax agenda may impact your company and how we can help you remain fully compliant.