Fiscal subject related
Portuguese authorities have announced another postponement for the mandatory use of B2G (business-to-government) electronic invoicing by small, medium, and microenterprises. Initially required from January 1, 2025, a new decree—Decree-Law no. 13-A/2025—extends the deadline, giving businesses more time to comply.
Until December 31, 2025, these companies can continue using alternative invoicing methods instead of the structured CIUS-PT e-invoicing format. This decision provides additional flexibility for affected businesses as they transition to the new system.
Other news from Portugal
End of intra-model European electronic invoice and new rules introduced
Starting July 1, 2030, the EU will eliminate the Intra models for VAT reporting, replacing them with mandatory electronic invoicing under Directive 516/2025. The new system, part of the VIDA 2030 Package, will require businesses to issue standardized e-invoices for all intra-EU B2B transactions, with data transmitted to VIES for cross-border VAT monitoring and fraud prevention. This shift aims to... Read more
Understanding the Digital Services Act
The Digital Services Act (DSA) is an EU regulation designed to ensure safer and more transparent online environments by imposing new responsibilities on digital service providers, including those outside the EU. It applies to a broad range of online platforms, with stricter obligations for very large platforms, but also key requirements for medium-sized businesses, such as EU representation, transparency, and content moderation reporting. Read more
The SAF-T file for April can be sent until the 7th of May due to an interruption in electricity supply.

Due to a major electricity outage on April 28 that disrupted tax portals and invoice systems, the Portuguese tax authorities have extended the SAF-T file submission deadline for April 2025 to May 7, 2025. No penalties will apply for submissions made by this new deadline, as system recovery efforts are still ongoing. Portuguese tax authorities have announced an extension for the submission... Read more
New document was uploaded: S4F backoffice patch
S4F backoffice patch is intended for users who have already installed S4F backoffice and are intended to update existing installations to latest version. To do so apply only patches that are marked with version number that is newer than your currently installed instance of backoffice. Read more
New document was uploaded: S4F backoffice patch
S4F backoffice patch is intended for users who have already installed S4F backoffice and are intended to update existing installations to latest version. To do so apply only patches that are marked with version number that is newer than your currently installed instance of backoffice. Read more
TLv6 Implementation Marks Significant Shift in EU’s Trust List Format
A new EU Trust List format, TLv6, will officially replace TLv5 in May 2025 as part of the updated eIDAS Regulation (EU 2024/1183). It introduces key technical changes like a new URI field, updated signature format, and optional phone number support. Organizations must update their systems to avoid signature validation failures and service disruptions, as TLv5 will no longer be valid once TLv6 take... Read more
New Certifying Entity to Issue Digital Certificates for Software Producers and Economic Operators in Portugal

The Portuguese Tax and Customs Authority announced that a new Certification Authority will go live on May 31, 2025, requiring Software Producers and Economic Operators to use 4096-bit RSA certificates for accessing AT web services. Read more