This paper analyzes the determinants of post-migration investments in education by adult immigrants using survey data for Australia. OLS, logit and multinominal logit analyses are employed. Post-migration educational attainment varies negatively with age at arrival and positively with respect to duration in the destination, pre-immigration schooling and pre-immigration occupational status. The effects of country of origin and visa category at entry are also analyzed. The positive (“complementary”) relation between pre- and post-migration schooling in these data. where both are directly measured, suggests that the “substitute” relation found in studies for the United States may be the spurious result of measurement error.