According to the ruling 166579/2020, from 20 April 2020, the version 1.6 of the technical specifications of the FatturaPA introduced by ruling 99922/2020 is now applicable as of 1 October 2020 on a voluntary basis and will be mandatory starting on 1 January 2021. Taxable persons may use the schema attached to version 1.5 of the technical specifications until 31 December 2020. The previous deadline, set to 4 May for the voluntary implementation and effectively enforced on 1 October, was postponed as a consequence of the COVID-19 pandemic.