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Purpose – The purpose of this paper is to analyze the moderation effect of over-commitment in the job crafting–well-being relationship, in the elderly care sector in Spain.

Design/methodology/approach – A cross-sectional design was implemented and a final sample of 353 participants were assessed using the Job Crafting Questionnaire, an adaptation of the Over-commitment Scale from the Effort-Reward Imbalance Questionnaire, and the General Health Questionnaire (GHQ-12).

Findings – A positive interaction between relational and task crafting and over-commitment is observed in the prediction of well-being levels. Specifically, the effect of over-commitment in the task crafting–well-being relationship proved to be statistically significant when opposed to low, medium and high levels of over-commitment. Additionally, the effect of over-commitment in the relational crafting–well-being relationship proved to be statistically significant only when opposed to medium and high levels of over-commitment. Finally, a direct and simple effect was observed between cognitive crafting and well-being, not moderated by over-commitment.

Research limitations/implications – Implementation of non-behavioral measurements, and a non-longitudinal design are suggested. The development of behavioral measures for job crafting is encouraged, along with the implementation of longitudinal designs sensitive to changes in over-commitment. Possible over-commitment results are biased by an economically contracted environment.

Practical implications – Job crafting training, over-commitment early detection and further research on job crafting strategies’ preferences are suggested.

Originality/value – The moderating role of over-commitment in the job crafting–well-being relationship in the elderly care sector represents one of these attempts to better understand evidences of how work-related efforts modify a worker’s psychological functioning and adaptation, which is the reason why, specially in contexts of uncertainty, its study becomes relevant.