The manual is designed to be a useful resource for tax officials, policymakers responsible for domestic revenue mobilization, and IT staff or tax professionals in nations exploring how to establish an integrated platform for managing tax to enhance compliance. The manual explains the foundations of tax ICT in tax administration, the main challenges in taxation, and tax compliance risk management and it describes the most essential components of innovative new technologies, such as AI and Blockchain, from a practical standpoint. In this regard, the key agents involved in the administration of tax obligations from the managerial and operational arenas, such as tax experts and data analysts, can use this manual as a resource to delve deeper into the possibilities offered by ICT and taxation