Portugal requires structured e-invoices for public procurement, and from January 2026 the rule covers businesses of every size. Invoicier gets you sending and receiving in minutes.
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Is e-invoicing mandatory in Portugal?
For the public sector, yes, and expanding. Large companies have had to send structured e-invoices to public bodies since 2021, and from 1 January 2026 the obligation extends to small, medium, and micro-enterprises. Domestic B2B invoicing is governed by certified software, ATCUD, and SAF-T rather than a clearance mandate.
Peppol (Pan-European Public Procurement On-Line) is the standard network for exchanging structured electronic invoices across Europe. In Portugal, Peppol is one of the accepted channels for sending e-invoices to public bodies through accredited access points, alongside the government's FE-AP platform operated by eSPap.
Public-sector e-invoicing has been mandatory for large companies since 2021. After several extensions, the obligation extends to small, medium, and micro-enterprises from 1 January 2026, so every supplier to the Portuguese public sector must send structured e-invoices. The national format is CIUS-PT, the Portuguese profile of EN 16931, implemented as UBL 2.1 or UN/CEFACT CII XML.
Domestic B2B in Portugal is not a real-time clearance model. Instead, invoices must be issued from certified billing software and carry an ATCUD unique document code and a QR code, with data reported to the tax authority through SAF-T(PT). Connecting to Peppol keeps you ready for public tenders and for cross-border e-invoicing across Europe.
Portuguese e-invoices are exchanged as structured XML. Invoicier generates and validates these formats for you.
On the Peppol network, Portuguese businesses are addressed by a participant identifier built from their official tax number.
Large companies must send structured e-invoices to public-sector bodies.
All invoices must carry an ATCUD unique document code and a QR code, issued from certified software.
Small, medium, and micro-enterprises must also send e-invoices to the public sector.
PDF invoices must carry a Qualified Electronic Signature (QES) to be accepted as valid e-invoices.
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