Expenditure taxes,income taxes,and time-inconsistency

Traditional welfare-based comparisons of different tax structures implicitly assume that the government can precommit to its future optimal policy. When optimal tax rates are time- inconsistent, however, such comparisons may be misleading. This paper uses a two-period representative-consumer optimal taxation model to study the implications of time-consistency for the welfare rankings of expenditure and income taxation. I show that the welfare rankings of optimal policies may not be preserved by time-consistent ones.