Tax systems raise large amounts of revenue for funding public sector's activities, and tax/transfer policy, together with public provision of education, health care, and social services, play a crucial role in treating the symptoms and the causes of poverty. The normative analysis is crucial for tax/transfer design because it makes it possible to assess separately how changes in the redistributive criterion of the government, and changes in the size of the behavioural responses to taxes and transfers, affect the optimal tax/transfer system. Optimal tax theory provides a way of thinking rigorously about these trade-offs. Written primarily for graduate students and researchers, this volume is intended as a textbook and research monograph, connecting optimal tax theory to tax policy. It comments on some policy recommendations of the Mirrlees Review, and builds on the authors work on public economics, optimal tax theory, behavioural public economics, and income inequality. The book explains in depth the Mirrlees model and presents various extensions of it. The first set of extensions considers changing the preferences for consumption and work: behavioural-economic modifications (such as positional externalities, prospect theory, paternalism, myopic behaviour and habit formation) but also heterogeneous work preferences (besides differences in earnings ability). The second set of modifications concerns the objective of the government. The book explains the differences in optimal redistributive tax systems when governments - instead of maximising social welfare - minimise poverty or maximise social welfare based on rank order or charitable conservatism social welfare functions. The third set of extensions considers extending the Mirrlees income tax framework to allow for differential commodity taxes, capital income taxation, public goods provision, public provision of private goods, and taxation commodities that generate externalities. The fourth set of extensions considers incorporating a number of important real-word extensions such as tagging of tax schedules to certain groups of tax payers. In all extensions, the book illustrates the main mechanisms using advanced numerical simulations.

This book provides a comprehensive survey of optimal income tax theory, following the development of research strategy from the basic Mirrlees model through to its refinements, examining how optimal tax rates and the shape of tax schedules are affected by new considerations. Optimal taxtheory has an important contribution to make to tax policy formation, and has become especially pertinent in recent years with the renewal of controversy over whether progressive income tax is in fact desirable or not. The author not only covers the historical background and modern formulations of the theory, but extends his discussion to consider the most important extensions of the model and the interrelation of income tax with other instruments of tax and expenditure policy.

An economist examines the evolution of optimal tax analysis and its influence on tax policy design. Many things inform a country's choice of tax system, including political considerations, public opinion, bureaucratic complexities, and ideas drawn from theoretical analysis. In this book, Robin Boadway examines the role of optimal tax analysis in informing and influencing tax policy design. Scholars of public economics formulate models of optimal tax-transfer systems based on normative principles that reflect efficiency and equity considerations. They use that analysis to form views about the optimal design or reform of actual tax systems that are much more complicated than their models. Boadway argues that there is an important symbiosis between ideas drawn from normative tax analysis and tax policies actually enacted. Ideas germinated by normative analyses have led to the widespread adoption of the value-added tax, the use of refundable tax credits, and various business tax reforms. Other ideas provide rationales for existing features of tax systems, including the tax treatment of retirement savings and human capital investment. Boadway charts the evolution of optimal tax analysis and discusses the lessons it holds for tax policy. He describes the theoretical challenges posed by recent findings in such fields as behavioral economics and social choice and considers how optimal tax analysis might adapt to these new paradigms. His analysis offers a timely assessment of the role that optimal tax theory has played in establishing the principles that continue to inform tax policy.

From the 1980s onward income inequality increased in many advanced countries. It is very difficult to account for the rise in income inequality using the standard labour supply/demand explanation. Fiscal redistribution has become less effective in compensating increasing inequalities since the 1990s. Some of the basic features of redistribution can be explained through the optimal tax framework developed by J.A. Mirrlees in 1971. This Element surveys some of the earlier results in linear and nonlinear taxation and produces some new numerical results. Given the key role of capital income in the overall income inequality it also considers the optimal taxation of capital income. It examines empirically the relationship between the extent of redistribution and the components of the Mirrlees framework. The redistributive role of factors such as publicly provided private goods, public employment, endogenous wages in the overlapping generations model and income uncertainty are analysed.

Based on the findings of a commission chaired by James Mirrlees, this volume presents a coherent picture of tax reform whose aim is to identify the characteristics of a good tax system for any open developed economy, assess the extent to which the UK tax system conforms to these ideals, and recommend how it might be reformed in that direction.

The Theory of Taxation and Public Economics presents a unified conceptual framework for analyzing taxation--the first to be systematically developed in several decades. An original treatment of the subject rather than a textbook synthesis, the book contains new analysis that generates novel results, including some that overturn long-standing conventional wisdom. This fresh approach should change thinking, research, and teaching for decades to come. Building on the work of James Mirrlees, Anthony Atkinson and Joseph Stiglitz, and subsequent researchers, and in the spirit of classics by A. C. Pigou, William Vickrey, and Richard Musgrave, this book steps back from particular lines of inquiry to consider the field as a whole, including the relationships among different fiscal instruments. Louis Kaplow puts forward a framework that makes it possible to rigorously examine both distributive and distortionary effects of particular policies despite their complex interactions with others. To do so, various reforms--ranging from commodity or estate and gift taxation to regulation and public goods provision--are combined with a distributively offsetting adjustment to the income tax. The resulting distribution-neutral reform package holds much constant while leaving in play the distinctive effects of the policy instrument under consideration. By applying this common methodology to disparate subjects, The Theory of Taxation and Public Economics produces significant cross-fertilization and yields solutions to previously intractable problems.

Optimal tax design attempts to resolve a well-known trade-off: namely, that high taxes are bad insofar as they discourage people from working, but good to the degree that, by redistributing wealth, they help insure people against productivity shocks. Until recently, however, economic research on this question either ignored people's uncertainty about their future productivities or imposed strong and unrealistic functional form restrictions on taxes. In response to these problems, the new dynamic public finance was developed to study the design of optimal taxes given only minimal restrictions on the set of possible tax instruments, and on the nature of shocks affecting people in the economy. In this book, Narayana Kocherlakota surveys and discusses this exciting new approach to public finance. An important book for advanced PhD courses in public finance and macroeconomics, The New Dynamic Public Finance provides a formal connection between the problem of dynamic optimal taxation and dynamic principal-agent contracting theory. This connection means that the properties of solutions to principal-agent problems can be used to determine the properties of optimal tax systems. The book shows that such optimal tax systems necessarily involve asset income taxes, which may depend in sophisticated ways on current and past labor incomes. It also addresses the implications of this new approach for qualitative properties of optimal monetary policy, optimal government debt policy, and optimal bequest taxes. In addition, the book describes computational methods for approximate calculation of optimal taxes, and discusses possible paths for future research.