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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.
Mandatory
B2G Status
Voluntary
B2B Status
#E-Invoicing Status
B2G and B2B electronic invoicing requirements
B2G (Business to Government)
Mandatory
Effective: January 1, 2021
Electronic invoicing requirements for transactions with government entities.
B2B (Business to Business)
Voluntary
Electronic invoicing requirements for transactions between private businesses.
#Platform & Formats
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