Policy makers often delegate partial decision-making authority to experts. Although monetary transfers can align an expert’s policy choices with the decision maker’s preferences, such transfers are typically not observed in practice. We analyze delegation in a principal-agent model, allowing transfers. The policy maker and expert have identical preferences over state-contingent policy but disagree over the accuracy of the expert’s information. Specifically, the policy maker believes the expert is overconfident in the precision of the signal he receives about the state of the world. The optimal mechanism is a delegation interval, and transfers are not used.