A model focusing on the role of the individual in national and corporate culture clash situations, during post-merger integration, is presented. The theory of psychological contract is adapted to explain different individual expectations in domestic versus international mergers and acquisitions (M&As). It is proposed that expectations on the part of both parties to the merger can act to moderate the effects of culture clash in M&As on acquired management attitudes and behavior, and thereby influence post-merger turnover and integration success. Thus, the model explains the inconsistencies of empirical findings about the different effects of national versus corporate cultural differences on M&A performance. The implications of these ideas for research and practice are discussed.