The article analyses the factors that have had a differential effect on the labour trajectories of individuals up to 40 years old during the economic and employment crisis in Spain. To this end, the study speciﬁcally examines labour trajectories in the period 2007–2011 using data from a longitudinal panel for Catalonia. First, it uses cluster analysis to classify the types of labour trajectory that were developed by the population aged under 40. Second, it uses a multinomial logit model to distinguish the individual, sectoral and familial characteristics inﬂuencing the development of a particular trajectory. The results show the importance of traditional lines of segmentation of the Spanish labour market, such as age and gender. However, they also highlight the importance of variables associated to social background (parents’ educational level and occupation). It is concluded that the factors linked to the different types of labour trajectories are similar to those identiﬁed in the literature for previous periods, although the role of family background seems to be more important than in the past, especially in trajectories marked by temporary employment.