Global inequality has declined between countries but risen within nations, making public perceptions of inequality increasingly important for political preferences and policy outcomes. This study, therefore, aims to explore the determinants of individuals’ perceptions of ideal income inequality, with particular attention to political mobilization as a key driver of such perceptions. Using World Values Survey (WVS) Wave VII data, we applied multilevel mixed-effects ordinal logit models and found that individuals with varying levels of political mobilization differ in their perceptions of ideal income inequality, with country-specific conditions significantly shaping this relationship. Among the eight parameters measuring political mobilization, four in the overall sample suggest that politically mobilized individuals are less likely to support greater income differences. However, this finding varies across country groups. Overall, the study provides empirical evidence on how perceptions of ideal income inequality differ and highlights the role of political mobilization in shaping these perceptions.