20 speakers of the 22nd General Assembly of IOTA write in this publication about digitalisation in tax administrations: reinventing tax administrations, modernising internal processes and improving the relations with taxpayers. Authors are Commissioners and senior managers from many of our member countries; Armenia, Belgium, Estonia, Finland, France, Italy, Norway, Portugal, Slovakia, Spain, Russia, Ukraine, United Kingdom, our international partners such as OECD, CIAT and Australia and representatives of the business community; PWC, Accenture, Bureau van Dijk.