Although there is a year left to introduce the obligatory National System of e-Invoices, companies should start preparations now. It is a complex and time-consuming process, both from a technological, substantive and procedural point of view. You can consider gradual implementation of the KSeF in the company and, as part of the test, start issuing and / or receiving some invoices earlier under the voluntary system. Janina Fornalik, a tax advisor, writes about it.
Source prawo.pl