Debates about tax policy arise every year in Washington, and legislative changes occur almost as often. In just the past decade, corporate tax burdens were dramatically reduced and then subsequently increased. But who really bears the burden of taxation? Finding a satisfactory way to address this question remains one of the biggest challenges for economists. While much research has explored this issue using annual data on household incomes and expenditures, this book considers the multiple effects of taxes on individuals over their entire lifetimes.