Effects of material, social, and psychological incentives for giving and volunteering as well as socio-demographic and personality characteristics are studied in a factorial survey (n=1248). Social incentives for giving strongly increase intentions to give money and time. Requests for more efficient ways of contributing as well as requests for contributions to local as opposed to (inter)national organizations are also more likely to be honored. More highly educated and more empathic respondents were more likely to intend giving and volunteering. © 2009 Elsevier Inc.