This publication sets out considerations for policymakers embarking on planning and implementing a digital transformation of tax administration. Digitalization can play a key role in helping tax authorities lower compliance and administrative costs, collect more revenue more efficiently, enhance transparency and service to taxpayers, and accommodate big data flows. This report explores how tax administrations can use technology and how risks can be identified and reduced. It provides an assessment framework to support policymakers as they begin the planning process and outlines considerations for effective implementation of the tax administration of the future.