Orientation: Reversed causality is an area that has not commanded major attention within the South African context, specifically pertaining to engagement, burnout and job demands resources. Therefore, this necessitated an investigation to elucidate the potential effects.Research purpose: To investigate the reversed causal hypotheses of burnout and engagement in job demands-resources theory over time.Motivation for the study: Organisations and researchers should be made aware of the effects that burnout and engagement could have over time on resources and demands.Research design, approach and method: A longitudinal design was employed. The availability sample (n = 593) included participants from different demographic backgrounds. A survey was used to measure all constructs at both points in time. Structural equation modelling techniques were implemented with a categorical estimator to investigate the proposed hypotheses.Main findings: Burnout was found to have a significant negative longitudinal relationship with colleague support and supervisor support, whilst the negative relationship with supervisor support over time was more prominent. Engagement showed only one significant but small, negative relationship with supervisor support over time. All other relationships were statistically non-significant.Practical/managerial implications: This study makes organisations aware of the relationship between burnout and relationships at work over time. Proactive measures to promote relationships at work, specifically supervisor support, should be considered in addition to combatting burnout itself and promoting engagement.Contribution/value-add: This study provides insights and information on reversed causality, namely, the effects that engagement and burnout can have over time.