... Tax authorities adopt a wide variety of capital gains tax rules and tax capital gains either at the progressive marginal income tax rate (for example, in Canada, Australia, and short-term gains in the U.S.) or at a proportional tax rate (Finland, Japan or long-term gains in the U.S.). 1 As capital gains are taxed upon realization, individuals are able to lower their effective tax burden by postponing realization. This " lock-in effect " and the effect on trading decisions and asset prices has been addressed in theoretical (see, among others, Constantinides, 1983; Auerbach, 1989 Auerbach, , 1991 Klein, 1999; Poterba, 2002; Shackelford and Verrecchia, 2002; Auerbach and Bradford, 2004) as well as empirical studies (for example, Burman and Randolph, 1994; Lang and Shackelford, 2000; Seida and Wempe, 2000; Poterba and Weisbenner, 2001; Ivkovi´cIvkovi´c, Poterba, and Weisbenner, 2005; Dai, Maydew, Shackelford, and Zhang, 2008; Sialm, 2009 for the U.S. and Daunfeldt, Praski-Ståhlgren, and Rudholm, 2010 for Sweden). Despite general agreement that taxes affect individual portfolio decisions, little is known about the impact of different tax regimes on individual capital gains realizations over the individual's life cycle, and the heterogeneity in capital gains elasticities across individuals. ...