Background: Studies have reported difficulties in job acquisition and retention as well as unstable employment status among individuals with intellectual disabilities. Method: Chi-square, one-way ANOVA, and binary logistic regression analysis were employed to investigate the factors that affect the labour market transition of 374 individuals with intellectual disabilities. Results: There were significant differences in sex between the sustained unemployment group and the sustained employment groups; in educational level, between sustained employment and other groups; and in basic living security assistance received, between sustained unemployment and other groups. All psychological factors in the sustained employment group were higher than in the sustained unemployment group. Communication ability significantly affected sustained employment. Conclusions: Greater family support was associated with a lower turnover probability, and a higher educational level and greater family support increased the probability of retention. Developing family support systems may decrease the possibility of turnover and increase retention.