Background: Facial width-to-height ratio (fWHR) is a stable facial structure, and several studies investigated the predictive effects of fWHR on individual traits and behaviors. There is a dearth of data regarding the relationship between fWHR and success in business in terms of income level. The aim of this study was to correlate fWHR with monthly income of traders at kantin kwari market of Kano State. Materials and method: The participants were selected using simple random sampling technique with their consent and their Bio-data (age, sex, marital status, educational achievement, assets and other properties) and monthly income status were enquired for and recorded appropriately. The statistical analysis was performed using SPSS version 20. A Pearson’s correlation was carried out on the entire study population as well as based on the number of children, and number of wives. Results: A significant inverse association between fWHR and income level among participants with ≤ 2 children was obtained (r= -0.29, P= 0.035). Conclusion: the number of children a participant has, is a moderator for the relationship between fWHR and monthly income and higher value for fWHR predicted lower monthly income.