Key Features for Portuguese Invoice Compliance
To ensure compliance when creating invoices for Portugal, your invoicing solution must support specific features. All VAT-registered businesses in Portugal are required to use invoicing software certified by the Portuguese Tax Authority (AT) to generate invoices. This software must facilitate SAF-T (Standard Audit File for Tax) compliance, which involves generating and submitting monthly XML files containing detailed invoice data by the 5th day of the following month. Each invoice must clearly include both the supplier's and customer's full names, addresses, and tax identification numbers (NIF/VAT number), with the Portuguese VAT number following a "PT + 9 digits" format.
For B2B transactions, while a general structured e-invoicing mandate isn't yet in place, all invoices (paper or PDF) must feature a QR code and an ATCUD (Unique Document Code) generated by the certified software. From January 1, 2027, PDF invoices will also require a Qualified Electronic Signature (QES) to be legally valid.