Although partisan bias – when an authority transfers discretionary public resources to a politically aligned receiver − has been extensively studied, less is known about how this practice is affected by the voting regime − compulsory or voluntary voting. In this article, I study partisan bias in Chile, using administrative data of transfers from the central authority to local governments, highlighting two relevant scope conditions: the electoral cycle, and electoral uncertainty caused by the adoption of voluntary voting. I found strong evidence of partisan bias, especially in election years and in electorally riskier municipalities. This suggests that the uncertainty introduced by this electoral reform induced politicians to allocate a large share of resources to risky municipalities, because such resources would play a more significant role in the electoral outcome. Overall, these results imply that voluntary voting has a large impact on the way that resources are allocated across subnational units.
