The digital tax transformation solution, as outlined in the case study, focuses on enhancing taxation revenue for an APAC-based taxation authority. The primary objectives include detecting tax avoidance, promoting voluntary compliance, and ensuring fair and judicious tax administration. To achieve these goals, the solution employs big data technologies to process vast amounts of data, such as 170 million active PAN card holder records, 5 billion tax return transactions per year, 3.5 billion documents, and data from over 50,000 sources. The solution aims to improve user experience for various stakeholders, including 52,000+ officers, 425,000+ users at reporting entities, 180+ foreign users, and 170 million taxpayers. This is accomplished through user-friendly portals and mobile apps.