Individual-level explanations of electoral participation typically argue that non-voting is determined by a combination of facilitative and motivational factors. We advance the argument that, beyond individual characteristics, there are pivotal contextual features which enable or impede individual action through specific incentive structures. Thus, contextual factors influence the individual propensity to vote or to abstain. For the first time the data of Selects 2003 allows for the testing of contextual effects, at least on the cantonal level. Several multilevel analyses show that high party competition, compulsory voting, and strong Catholicism foster individual participation. The findings clearly indicate that an individual's propensity to vote is influenced by personal characteristics as well as by cantonal attributes.