PurposeThis study aids to examine the impact of extending the internship period on the transition from school to work of vocational school of higher education graduates and subsequent employment outcomes.Design/methodology/approachWithin the scope of the study, the results regarding the labour market of the vocational school students (experimental group) whose internship period were extended were compared with the results of the vocational school students (control group) whose internship period remained the same. Thus, it is provided to examine the effects of prolonging the internship period. The surveys were conducted five years after graduation.FindingsThe study found that increasing the duration of the internship period and making it a compulsory part of the curriculum facilitates the transition from school to work for graduates. Graduates who participate in the programme with a long internship period find a job in a shorter time and with higher wages than the control group. It is found that those in the experimental group with an extended internship period have higher employment rates and wage levels compared to those in the control group, five years after graduation.Originality/valueAlthough there are publications, in the international literature, on the impact of internship, there are only few publications in which experimental and control groups are formed, as in this article. The second contribution of the study is to measure the impact of internship on employment outcomes five years after graduation. The third important contribution of the study is that it was conducted in Turkey, which has a young population and is an emerging market. This study contributes significantly to the restructuring of vocational higher education, especially in countries that are struggling with youth unemployment.