Invoices are issued from certified software, carry an ATCUD and a QR code, and are reported through SAF-T.
The facts
| Format | Certified software with ATCUD and QR code, SAF-T (PT) reporting |
| Goes to | Autoridade Tributária e Aduaneira |
| Regime | Post-audit — you issue, then report |
| Invoice number | Stays ours: gap-free, sequential, yours to control |
| Seller tax ID | VAT number |
| Buyer tax ID | VAT number |
| Peppol EAS code | 9946 |
| Integration | Direct, no third-party provider needed |
The part that costs a day
Portugal regulates the software, not the document: the programme that issues invoices has to be certified by the tax authority and each series has to be registered in advance to obtain its ATCUD validation code. That means you cannot simply start a new series on the first of January — you register it first, and an invoice issued on an unregistered series is invalid.
We issue gap-free, sequential numbers that reset on your schedule and are never reused — including for voided documents, which keep theirs. The authority takes the document as numbered.
Never extracted from the gross. The two formulas differ by a cent and the wrong one gets the file rejected. The leftover cent is declared as payment rounding (BT-114), where the standard puts it.
Straight talk
We do not hold your signing certificate, we do not file your periodic returns, and we are not your accountant.
No third-party provider is required: we build and validate the document ourselves, and you can still connect one if your accountant prefers it.
Oltrano