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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.
In recent years, the way companies issue and manage invoices has changed profoundly. Billing programs installed on a single computer or local server are being replaced by cloud solutions, accessible via the internet and updated in real time.
Honest reflection on the true cost of free invoicing software and free or trial versions. If you look for free invoicing software you will find dozens of options, aggressive marketing promises and lots of “forever” in big letters. But is there really 100% free invoicing, with no commitments, no limitations and no risks?
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).
Whenever someone considers changing billing or management software, the same fears almost always arise: fear of being “stuck” with a solution, fear of losing information and the feeling that it is necessary to “take the whole house on your back” to the new platform.
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.
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.
