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E-Invoicing in Portugal
All public sector suppliers must issue structured e-invoices using CIUS-PT format from January 2026. B2B remains voluntary.
B2G (Business to Government)
Mandatory
Effective: January 1, 2021
Electronic invoicing requirements for transactions with government entities and public sector organizations.
B2B (Business to Business)
Voluntary
Electronic invoicing requirements for transactions between private businesses and commercial entities.
Supported Formats
CIUS-PTUBLEN 16931
Additional Notes
B2B e-invoicing voluntary but widely adopted. SAF-T reporting required.
Open Banking + E-Invoicing in Portugal
Combining e-invoicing with Open Banking creates powerful automation opportunities. Open Banking APIs enable real-time bank transaction access for automated invoice reconciliation, while Payment Initiation Services (PIS) allow instant payments directly from e-invoices.
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Auto-Reconciliation
Match bank transactions with e-invoices automatically
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Instant Payments
Pay invoices with one click via PIS
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Cash Flow Visibility
Combine invoice & bank data for forecasting
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