Transparency is critical to good governance, but it also imposes significant governance costs. Beyond a certain point, excess transparency acts as a kind of tax on the legal system. Others have noted the burdens of maximalist transparency policies on both budgets and regulatory efficiency, but they have largely ignored the deeper cost that transparency imposes: it constrains one’s ability to support the law while telling a self-serving story about what that support means. Transparency’s true tax on the law is the loss of expressive ambiguity. In order to understand this tax, this Article develops a taxonomy of transparency types. Typically, transparency means something like openness. But openness about what—the law’s obligations? The reason...