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A model that integrates and builds on the job demands-resources model and self-determination theory is proposed to better understand the role of work motivation in relation to job resources, occupational commitment and emotional exhaustion. Two forms of motivation were studied: autonomous motivation, in which employees act with volition,; and controlled motivation, in which they act under internal or external pressure. Data were collected at two time points nine months apart from a sample of 586 school principals in Quebec, Canada. SEM analysis results support the hypothesized model. Specifically, job resources had a positive effect on autonomous motivation but a negative effect on controlled motivation. In addition, taking into account the cross-lagged effects of job resources on commitment and exhaustion, autonomous motivation had a negative effect on exhaustion but a positive effect on commitment …