This research is intended to examine the relationship between the Employment Vulnerability Index (EVI) and labor informality in Ecuador in 2018, 2019, and 2021 (considering both pre- and post-pandemic periods). The EVI was constructed using a polychoric principal components analysis (PCPA), while a logistic regression model and a two-stage least squares linear probability model were employed to evaluate its association with workers' informal status. The findings indicate a positive correlation between employment vulnerability and the likelihood of a worker being engaged in the informal sector, with this correlation being particularly pronounced among individuals with higher EVI scores. Accordingly, policymakers are advised to concentrate their efforts on enhancing workers' conditions by increasing educational attainment and implementing programs designed to incentivize formal employment.