Portugal has no general B2B e-invoicing clearance mandate, but it has strict digital tax controls. Invoices must be issued through AT-certified software, include ATCUD and QR codes, and be reported monthly via SAF-T Billing. B2G structured e-invoicing is mandatory for all public-sector suppliers, and from 1 January 2027, PDF invoices in B2B and B2C will require a Qualified Electronic Signature.
Portugal E-Invoicing: No B2B Clearance Mandate, But Strict Digital Tax Controls
Public
Portugal
Author: Ljubica Blagojević
Category:
Fiscal subject related
General information
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56
Content accuracy validation date:
27.05.2026
Content accuracy validation time:
08:42h
Portugal is often misunderstood as a country without a real e-invoicing mandate. In a narrow sense, this is correct: Portugal does not currently have a general B2B structured e-invoicing obligation, no SDI-style clearance platform, no mandatory Peppol B2B model, and no real-time invoice approval by the tax authority. However, this does not mean that Portugal is a low-compliance jurisdiction. Its system is based on a strict post-issuance reporting model, where invoices are issued first and then controlled through certified software, ATCUD, QR codes, hash integrity, and SAF-T reporting.
Every invoice issued in Portugal, whether paper, PDF, or XML, must generally be produced through AT-certified software. It must include the software certification number, an ATCUD code, and a QR code, while invoice data must be reported to the Portuguese tax authority through monthly SAF-T (PT) Billing by the 5th day of the following month. These requirements apply not only to Portuguese businesses, but also to non-resident businesses VAT-registered in Portugal.
The main compliance layers are:
- Certified invoicing software
Invoicing software must be certified by the Portuguese Tax Authority. Using non-certified software may result in significant penalties. - ATCUD and QR code
Since 2023, invoices must include an ATCUD, while QR codes have been mandatory since 2022. These elements support invoice traceability and tax audit controls. - SAF-T reporting
Businesses must submit SAF-T Billing monthly. SAF-T Accounting has been postponed and is expected to become mandatory in 2028 for FY 2027 data. - B2G e-invoicing
Suppliers to Portuguese public authorities must issue structured e-invoices in CIUS-PT format. This obligation already applied to large companies and was extended to SMEs and micro-enterprises from 1 January 2026. - Qualified Electronic Signature for PDFs
PDF invoices remain valid without a Qualified Electronic Signature until 31 December 2026. From 1 January 2027, PDF invoices in B2B and B2C transactions will require a QES, unless another accepted electronic format or certified EDI model is used.
In practice, Portugal should not be described simply as a country without e-invoicing. A better description is that Portugal has no general B2B clearance mandate, but it has a highly developed digital tax control framework. The most important point for businesses is that invoice format may be flexible, but the compliance process is not. Certified software, ATCUD, QR codes, SAF-T reporting, and, soon, QES for PDFs are mandatory elements that must be considered together.
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