ABSTRACT Most research on the consequences of school absenteeism has focused on academic achievement rather than post-school outcomes. Using the Scottish Longitudinal Study (n = 2,941), we investigated the link between overall absences, truancy, sickness-related absences, and upper secondary school leavers’ post-school destinations. We also examined how upper secondary school achievement explains these associations. Overall school absences during the first year of upper secondary schooling decreased the likelihood of continuing further and higher education. However, they increased the likelihood of being employed or not being in education, employment, or training (NEET). Sickness absences and truancy also reduced the likelihood of pursuing further and higher education. Truancy did not significantly increase the risk of NEET, but sickness absences did. Both absence types did not significantly influence the likelihood of being employed. Academic achievement mediated 78%-100% of the link between overall absences, sickness absences or truancy and entry into further and higher education versus being employed. While achievement explained 38%–55% of the link between all absences and further and higher education versus NEET, it did not explain the link between absences and NEET versus being employed. The study emphasises the necessity of reducingunexcused and excused school absences and mitigating their effects.