Expanding to Portugal: Simplifying Fiscalization with SIGN PT

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21 mai 2026

Portugal’s invoicing regulations are among the most structured in Europe. Every fiscally relevant document must be digitally signed, carry an ATCUD code and a QR code, and be reported to the Portuguese Tax Authority (AT). From 2027, qualified electronic signatures (QES) on PDF invoices become mandatory. If your ERP, POS, or invoicing system serves the Portuguese market, meeting these requirements is not optional — and building the compliance layer from scratch takes months.

SIGN PT is fiskaly’s fiscalization API for Portugal. It handles the full compliance stack so you can focus on your product.

What Portuguese law requires

Portugal’s certified billing framework, governed by Decree-Law 28/2019 and related portarias, defines clear obligations for any software issuing invoices in Portugal:

Digital signing and chaining — Every fiscal document must be cryptographically signed and linked to the previous one to ensure a tamper-evident chain.
ATCUD (Código Único do Documento) — A unique document identifier combining the AT-assigned series validation code with the sequential document number. Mandatory since 2023.
QR code — Structured fiscal data encoded as a QR code, printed on every document. Mandatory since 2022.
SAF-T (PT) reporting — Invoicing data must be reported to the AT, typically monthly, in standardized SAF-T (PT) XML format — or in real time via AT Web Services (WFA/WDT).
Qualified Electronic Signature (QES) — Currently optional for PDF invoices. Mandatory from 1 January 2027.

Non-compliance can result in fines, rejected documents, and audit exposure.

What SIGN PT does

SIGN PT provides the endpoints your system needs to meet all of the above through a single REST integration:

Series registration — Register and manage document series with the AT before use, and retrieve the validation codes needed to generate ATCUD.
Signing and chaining — Sign and chain fiscal documents server-side. No local keys, no hardware dependencies.
ATCUD and QR code generation — Both are computed and returned by the API, ready to embed in your document rendering layer.
SAF-T (PT) export — Generate standards-compliant SAF-T (PT) XML for monthly reporting, without building the export logic yourself.
AT Web Services submission — Submit documents in real time via WFA and WDT where applicable.

Supported document types include Standard Invoices (FT), Simplified Invoices (FS), Invoice-Receipts (FR), and Credit/Debit Notes (NC/ND). Transport Guides (GT/GR) are coming soon. Optional long-term archiving is available through fiskaly SAFE, covering Portugal’s 10-year retention requirement.

Tip: SIGN PT is built on the Unified API — fiskaly’s multi-country architecture. Integrate SIGN PT once, and adding SIGN IT or SIGN FR means changing the payload schema, not rewriting your integration.

QES: get ahead of the 2027 deadline

The qualified electronic signature requirement is the most significant upcoming change in Portuguese fiscal law. From 1 January 2027, all non-EDI PDF invoices must carry a QES issued by a certified trust service provider. SIGN PT is designed to extend natively to this requirement, so your integration is not left behind when the deadline arrives.

Get started

If you are building for the Portuguese market, start with the SIGN PT overview and the Portugal introduction guide to understand the compliance flow end to end. When you are ready to integrate, the SIGN PT integration guide walks you through series registration, document signing, and SAF-T reporting step by step.

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