This paper examines the determinants of gender income inequality in South Africa. The study uses a stacked and harmonised cross-sectional dataset from the Post-Apartheid Labour Market Survey (PALMS) for 2007 and 2017. The investigation also employs the Blinder-Oaxaca Decomposition and Unconditional Quantile Regression techniques. The results concur that, on average, women earn less than men in South Africa. Furthermore, education, occupation, and work experience emerged as important factors explaining the gender wage gap. Women tend to have lower education levels and are more likely to work in lower-paying occupations. Moreover, the gender wage gap is larger among older workers and those with longer tenures. This suggests that women face greater barriers to career advancement. The results emphasise the importance of policies to improve access to education and promote gender equality in reducing gender income inequality in South Africa.