Although the association between working alliance and outcome is a consistent ﬁnding in voluntary psychotherapy research, there is a lack of knowledge of the signiﬁcance of this concept in mandated treatment. This study examined the relationship between the oﬀender-rated working alliance and recidivism in a sample of 199 oﬀenders mandated to community supervision. Working alliance was disentangled in trait-like and state-like components. Cox regression analysis was used. The working alliance subscales were measured by the Working Alliance with Mandated Clients Inventory (WAMCI). When controlling for crime history or risk level, the state-like change patterns of the working alliance subscale Trust predicted general and serious recidivism during the four year follow-up period. When controlling for crime history, the trait-like early alliance subscales Trust and Reactance predicted serious recidivism. These ﬁndings imply that the concept of the working alliance and speciﬁcally the facet Trust deserves more attention in the training of Probation Oﬃcers.