Portugal E-invoicing Regulations

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Latest regulation update

Mandatory e-invoices in Estonia. How will this affect Lithuanian businesses?

From July 2025, B2B e-invoices in Estonia will be mandatory upon request, and by 2027, for all businesses. How will this affect Lithuanian companies, and what steps should they take?

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Electronic invoicing requirements

Unifiedpost Group has a compliant outbound solution.

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Technical requirements

Platform - eSPap for central authorities, decentralised for the rest
Format - CIUS-PT
Archival period - Minimum 10 years

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B2G mandates

Receiving - All public bodies
Issuing - All suppliers of public bodies

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B2B mandates

No existing or upcoming mandates

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Compliance considerations

Monthly SAF-T billing submissions
ATCUD Sequential Number - allocated by AT for batches of invoices prior to their issuance
QR code on paper or PDF invoices
1 January 2026 - Qualified Electronic Signatures (QES) on PDF invoices (confirmation of proposed 2027 postponement pending)

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Electronic invoicing requirements

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