The positive side of employment during studies is the increase of net investments in human capital. The main objective of this paper is to discover factors influencing the work of students in Serbia, Bosnia and Herzegovina and Montenegro and to compare students' employment in these three Western Balkan countries. Quantitative analysis based on binary logistic regression has been performed using datasets from fifth wave of EUROSTUDENT survey. The models were built on the basis of seven predictors which describe opportunity structure in higher education and socio-economic background of students. The entered set of predictors is significantly influencing the students' employment during study terms. The significant predictor of working status in all three countries is the age of students. Additionally, the significant factor in Serbia is the level of studies, in Montenegro the level and field of studies, while in Bosnia and Herzegovina the educational level of parents.