Start-up packages vary enormously, particularly across institutions, and not all faculty know what items they may negotiate for to support their probationary period. To demystify this part of the hidden curriculum, we discuss the components of start-up packages and other benefits that may be provided to new faculty at the time of hire. We focus on five broad topics: compensation and personal support, general support, research support, teaching support, and service and professional development. Drawing on the results of a survey of tenure-track assistant political science professors in the United States, we also provide an overview of the prevalence of a variety of items at different types of institutions and discuss other considerations in the negotiation process to close the knowledge gap for candidates during negotiations.