“Decree-Law No. 28/2019, of February 15th, brought changes to several levels: billing, archiving, use of computer programs, new mandatory communications, etc. With this article we intend to contribute to the clarification of some concepts and their practical application. Economic agents deal with billing documents, budgets, worksheets, table appointments, receipts, among other documents. It is necessary … Continue a ler Decree-Law No. 28/2019 – some notes