The book describes the difficulties of the current international corporate income tax system. It starts by describing its origins and how changes, such as the development of multinational enterprises and digitalization have created fundamental problems, not foreseen at its inception. These include tax competition-as governments try to attract tax bases through low tax rates or incentives, and profit shifting, as companies avoid tax by reporting profits in jurisdictions with lower tax rates. The book then discusses solutions, including both evolutionary changes to the current system and fundamental reform options. It covers both reform efforts already under way, for example under the Inclusive Framework at the OECD, and potential radical reform ideas developed by academics.

This paper identifies policy tools that could be used for fiscal consolidation in advanced and emerging economies in the years ahead. The consolidation strategy, particularly in advanced countries, should aim to stabilize age-related spending in relation to GDP, reduce non-age-related expenditure ratios, and increase revenues. Bold reforms are needed to offset projected increases in age-related spending, particularly health care. On the revenue side, measures could include improving tax compliance, for example through better international cooperation, as well as increasing the yield from VAT by eliminating exemptions and reduced rates, further developing property taxes, and increasing excise rates within the range of rates already applicable in comparable countries.