This article examines predictors of the financial well‐being of female college students living in São Paulo or New York, focusing upon the relationship with their credit card use behaviour. The results of structural equation models, based on 784 participants, suggest that financial self‐confidence and social comparison have an impact on the use of credit cards and exercise an influence on financial well‐being. Despite the fact that social comparison is more strongly predictive of credit card use among Brazilian women, credit card use behaviour has a greater impact on the well‐being of American women.