This study provides an evaluation of the impact of Korea's stratified labour market on the gaps in wages and social security coverage using the raw data from the supplementary surveys conducted by the Korean National Statistics Office. The study confirms the existence of a labour market stratified by employment type/gender/unionised or non‐unionised/firm size. The labour market structure is not only reflected in the distribution of wages but also in the social security coverage. The empirical result suggests that gender and employment type are the key variables determining the likelihood of social security exclusion. With the other conditions controlled, the female worker has a 65 per cent likelihood of exclusion, and the non‐standard worker has a 40.9 per cent likelihood. For female non‐standard workers, the situation is worse. Their likelihood of exclusion from social security soars to 80.1 per cent. The empirical results with respect to other fringe benefits not mandated by law exhibit the same pattern of social security exclusion. The empirical results emphasise the limitations of gender policy intended to rectify gender discrimination or exclusion alone and suggest a matrix policy that takes into consideration the complex labour market structure.