PhD programmes are considered as transmission channels to provide specialisation and skills to students who will be employed as highly-qualified workers or researchers. Focusing on the Spanish case, they are exerting a positive influence on workers' careers since doctorate holders have a privileged situation in the labour market. This article analyses international mobility's effects on some aspects associated with doctorate holders' careers such as their wages and how their current employment is related to their doctoral studies. The methodology applied consists in developing, on the one hand, a wage econometric specification and, on the other, a probit model, taking into account the possible mismatch between the training acquired in the doctoral studies and the educational requirements of the current job. In both cases, the dependent variables are explained by a set of regressors and a dummy variable showing whether doctorate holders have spent time in another country once completed their doctoral studies.