The 2013 and 2018 Wittgenstein Centre (WIC) global population projections by age, sex, and level of education considered differential fertility and mortality by educational attainment. However, the educational composition of migrants was not explicitly included in the projections. One of the main differences in the 2023 update is the projection of future immigration and emigration flows by age, sex, and educational attainment. In this paper, we outline the methodology used to estimate the proportions of immigration and emigration flows between 1990 and 2020 by four education levels and 16 age groups for 183 countries. These proportions are used to project age, sex and education specific migration flows to 2100.