Fiscal subject related
Those are:
- Monthly SAF-T due by the 5th day of the month as of 2024 (the rule that was announced a month ago but is effective from 2024 until the 8th day of the year 2023 is allowed as a grace period) day of the month following the reporting period.
- From January 1, 2024, PDF invoices in Portugal must include a qualified electronic signature. The Portuguese government has made various adaptations to the fiscal calendar to facilitate compliance with the requirements announced by Decree Law No. 28/2019. which means that Form 2024 PDF invoices without electronic signatures will not be treated as valid.
Other news from Portugal
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
Portugal Delays B2G e-Invoicing for Small and Medium Businesses

Portugal has postponed the mandatory B2G electronic invoicing requirement for small, medium, and microenterprises from January 1, 2025, extending the compliance deadline to December 31, 2025. Until then, businesses can continue using alternative invoicing methods rather than the structured CIUS-PT e-invoicing format. Portuguese authorities have announced another postponement for the mandatory use... Read more
VIDA regulation adopted—what does that mean for business?
The EU adopted the VAT in the Digital Age (ViDA) package on March 11, 2025, introducing major changes to the VAT system starting January 1, 2027. Key reforms include mandatory digital VAT reporting by 2030, new VAT collection rules for online platforms, and expanded One-Stop Shop (OSS) registration to simplify cross-border compliance. Additional measures, such as mandatory e-invoicing, phasing out... Read more