This study contributes to an emic understanding of how different types of social obligations may help or hinder the formation of initial organizational trust within collectivist cultures. We extend prior social categorization insights by challenging the expectation that in-group favouritism automatically facilitates higher levels of initial trust among collectivists. We theorize and test the asymmetric effects of two different types of social obligations toward members of distinct social categories (kinship and friendship in-groups) on the formation of initial organizational trust. Using a quasi-experimental research design in a collectivist culture (Japan), we hypothesize and show that in ambivalent situations, voluntary social obligations toward members of friendship in-groups encourage early trust in trustees' organizations; however, involuntary social obligations toward members of kinship in-groups discourage early trust development toward the organization these trustees represent. The effects of (in)voluntary social obligations on initial organizational trust are contingent on how collectivists perceive each encounter: voluntary social obligations are more conducive to trust-building at lower levels of perceived opportunity; involuntary social obligations have stronger effects on initial organizational trust at higher levels of perceived risk.