Starting from January 1, 2021, the electronic invoice will change its face, with the introduction of a multiplicity of document types and the proliferation of nature codes. The changes to the XML layout, introduced by the Provision of the Director of the Revenue Agency n. 99922 of 28 February 2020 (specific version 1.6), and subject to subsequent retouching with Provision of 20 April 2020, prot. n. 166579/2020 (version 1.6.1.), Must be used starting from the year 2021, but starting from 1 October 2020 it will be possible to familiarize yourself with the news, given that in the final 3 months of 2020 they will be welcomed by the SDI both the documents prepared according to the current specific version 1.5, and those already compliant with the new indications of the Revenue Agency