Chris William Sanchirico (Pennsylvania) has posted Optimal Tax Policy and the Symmetries of Ignorance on SSRN. Here is the abstract:

What government-observable characteristics should determine the taxes that an individual pays and/or the transfers that she receives? This article focuses on a specific aspect of this fundamental question of tax policy: the implications of policymakers’ uncertainty regarding the outcomes of tax policy choices

More specifically, the article identifies and questions two implicit premises in policy-uncertainty-based arguments against including taxable attributes other than labor earnings in the base. The first is that greater uncertainty surrounds the optimal taxation of non-labor-earnings attributes than surrounds the optimal taxation of labor earnings. The second is that tax policymakers ought to follow a kind of precautionary principle under which uncertainty regarding an attribute counsels base exclusion. I show that both premises are flawed.