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Understand, in simple language, when Portuguese law requires a program certified by AT. Updated in November 2025 · Context: Decree-Law No. 28/2019, Ordinance No. 363/2010 (in the applicable wording) and General Regime for Tax Offenses.
Choosing an invoicing program is now a critical decision for any company, sole proprietorship or independent professional. In Portugal, in addition to day-to-day practical issues, there are specific legal requirements that the user must guarantee when selecting and using an invoicing program.
Software certification in Portugal: who needs to certify and when? In the Portuguese context, there is legislation that imposes certification obligations for computer programs, especially for invoicing programs. Below, we analyze the main diplomas, scope and consequences for software producers and users.
SAF‑T (PT) is a standardized file in XML format that contains essential accounting and invoicing information for a company. It was born from an OECD recommendation (“Standard Audit File for Tax Purposes”) and was adapted to the Portuguese reality by the Tax Authority (AT).
Choosing certified online invoicing software for Portugal shouldn't be complicated. Still, many entrepreneurs end up stuck between too basic solutions (which fail the Tax Authority's requirements) and heavy systems, full of menus and options that only make sense in a giant ERP.
Choosing invoicing software is not just an operational decision: it is a compliance decision. The Portuguese Tax Authority defines clear rules for a program to be considered certified. In this article we summarize the main requirements and explain how SimpleSum was designed to meet them.
In recent years, the Portuguese SaaS billing software market has exploded in options. Between older solutions and recent platforms, choosing the right system can be challenging. In this article we compare some of the best-known software and explain why SimpleSum stands out for its simplicity, intuitiveness and focus on the essentials.
