Portugal · Dynamics 365 Finance & Operations

What Portuguese tax rules mean for your D365FO rollout.

Plain-language briefings on Portuguese fiscal obligations and how they land in Dynamics 365. Written from public sources by a developer working on Portuguese fiscal localization in X++.

Recent changes Updated 17 October 2026

12 Oct 2026Service update 10.0.49 starts rolling out to sandbox environments in West Europe. BriefingMicrosoft
8 Oct 2026The 2027 State Budget proposal is delivered to Parliament. It would accept PDF invoices without a qualified signature until 31 December 2027. BriefingParliament
28 Jul 2026The tax authority publishes Ofício Circulado 25120/2026 on rectifying invoices and correcting VAT. Credit notes can no longer be used to cancel an invoice. BriefingAT

Dates are when each change was published. Deadlines and what they mean for D365FO are in the linked briefings, as they stood on the day of writing.

Portugal at a glance Portugal guide

The obligations a global D365FO template has to meet before it can invoice in Portugal. Most of them constrain the software itself, not only the documents it produces. Read the Portugal guide.

Audit file

SAF-T (PT)

A full structured extract of invoicing and accounting data, validated against a published schema.

 Software certification

Certified invoicing

In practice, any company running D365FO must invoice from software certified by the tax authority. Each document is signed into a hash chain per series.

 Every document

Series and ATCUD

Document series are registered with the tax authority before use. The returned code goes into the ATCUD and the QR code.

 Before goods move

Transport documents

Movements of goods are communicated to the tax authority before transport starts, with contingency rules when that fails.

 Ofício 25120/2026

Invoice corrections

Credit and debit notes correct value or VAT. Formal errors are cancelled and reissued.

 PDF invoices

Qualified e-signature

Electronic invoices need a qualified signature or seal, or EDI. The PDF tolerance has been extended more than once.

Latest briefings All briefings

Decree-Law 28/2019 · State Budget 2027

Qualified signatures on invoices: another year, and how ERPs are adapting

The status of the qualified electronic signature requirement for PDF invoices in Portugal, and what ERP vendors and Dynamics 365 are doing about it.

17 October 2026Microsoft · Power Platform admin center

Service updates in unified environments: why developers should test against two versions

How the Power Platform admin center handles Finance and Operations service updates, and what it means for which versions a developer should test.

17 October 2026AT · Ofício Circulado 25120/2026

Credit notes are not for cancelling invoices: what AT Circular 25120/2026 changes

A short reading of the Portuguese tax authority's July 2026 circular on invoice rectification, and the questions it raises for billing systems.

17 October 2026