We describe the preferred taxation regime in a small economy with uncertain institutional quality. We obtain that a preferential taxation regime in which taxes can be matched to the mobility of the tax base may be worse off than a non-preferential taxation regime in which taxes are constant across bases with distinct mobility. Since the small economy takes foreign taxes as given, our result is not driven by a downward pressure on revenues caused by unconstrained tax competition. It is instead related to the ability of a non-preferential taxation regime to credibly convey information about the institutional quality of the small economy. We present some empirical evidence which corroborates our results.