The papers in Tax Policy and the Economy Volume 31 are all directly related to important and often long-standing issues, often including how transfer programs affect tax rates and behavior. In the first paper, Alan Auerbach, Laurence Kotlikoff, Darryl Koehler, and Manni Yu take a lifetime perspective on the marginal tax rates facing older individuals and families arising from a comprehensive set of sources. In the second, Gizem Kosar and Robert A. Moffitt provide new estimates of the cumulative marginal tax rates facing low-income families over the period 1997-2007. In the third paper, Emmanuel Saez presents evidence on the elasticity of taxable income with respect to tax rates, drawing on data from the 2013 federal income tax reform. In the fourth, Conor Clarke and Wojciech Kopczuk survey the treatment of business income taxation in the United States since the 1950s, providing new data on how business income and its taxation have evolved over time. In the fifth paper, Louis Kaplow argues that the reduction in statutory tax rates from base-broadening may not reduce effective marginal tax rates on households.

This volume presents five new studies on taxation and government transfer programs. Alexander Blocker, Laurence Kotlikoff, Stephen Ross, and Sergio Villar Vallenas show how asset pricing can be used to value implicit fiscal debts, which are currently rarely measured or adjusted for risk, while accounting for risk properties. They apply their methodology to study Social Security. Michelle Hanson, Jeffrey Hoopes, and Joel Slemrod examine the effects of the Tax Cuts and Jobs Act on corporation behavior and on firms' statements about their behavior. They focus on for four outcomes: bonuses, investment, share repurchases, and dividends. Scott Baker, Lorenz Kueng, Leslie McGranahan, and Brian Melzer explore whether "unconventional" fiscal policy in the form of pre-announced consumption tax changes can shift durables purchases intertemporally, how it such shifts are affected by consumer credit. Alan Auerbach discusses "tax equivalences," disparate sets of policies that have the same economic effects, and also illustrates when these equivalences break down. Jeffrey Liebman and Daniel Ramsey use data from NBER's TAXSIM model to investigate the equity implications of a switch from joint to independent taxation that could occur in conjunction with adoption of return-free tax filing.

The six research studies in Volume 32 of Tax Policy and the Economy analyze the U.S. tax and transfer system, in particular its effects on revenues, expenditures, and economic behavior. First, James Andreoni examines donor advised funds, which are financial vehicles offered by investment houses to provide savings accounts for tax-free charitable giving, and weighs their effects on donations against their tax cost. Second, Caroline Hoxby analyzes the use of tax credits by students enrolled in online post-secondary education. Third, Alex Rees-Jones and Dmitry Taubinsky explore taxpayers' psychological biases that lead to incorrect perceptions and understanding of tax incentives. Fourth, Jeffrey Clemens and Benedic Ippolito investigate the implications of block grant reforms of Medicaid for receipt of federal support by different states. Fifth, Andrew Samwick examines means-testing of Medicare and federal health benefits under the Affordable Care Act. Sixth, Bruce Meyer and Wallace Mok study the incidence and effects of disability among U.S. women from 1968 to 2015, examining the impacts of disability on income, consumption, and public transfers.

This volume presents five new studies on current topics in taxation and government spending. Mark Shepard, Katherine Baicker, and Jonathan Skinner explore implementation aspects of a Medicare-for-All program, which provides a uniform health insurance benefit to everyone, and contrast it with a program providing a basic benefit that can be supplemented voluntarily. John Beshears, James Choi, Mark Iwry, David John, David Laibson, and Brigitte Madrian examine the design and feasibility of firm-sponsored "rainy day funds," short-term savings accounts for employees that can be used when faced with temporary periods of high expenditure. Robert Barro and Brian Wheaton investigate the impact of taxation on choice of corporate form, on the formation and legal structure of new businesses, and indirectly on productivity in the economy. Jonathan Meer and Benjamin Priday examine the impact of the 2017 federal income tax reform, which reduced marginal tax rates and the incentive for charitable giving, on such giving. Finally, Casey Mulligan analyzes the impact of the Affordable Care Act on whether firms employ fewer than 50 employees, the employment threshold below which they are exempt from the requirement to provide health insurance to their employees.