Background: The integrated motivational-volitional model of suicidal behaviour (IMVM) postulates an influence of entrapment upon suicidal ideation depending on motivational moderators such as perceived burdensomeness (PB) or thwarted belongingness (TB). However, little is known about the short-term and longitudinal relationship in real time and in regard to a clinically relevant sample. Therefore, this study aims to investigate whether it is possible to predict concurrent suicidal ideation as well as suicidal ideation over time according to the IMVM and whether motivational moderators influence these associations individually differently. Methods: An ongoing ecological momentary assessment study examining networks of various symptoms (depression, suicidal ideation, and related risk factors) before and after CBT will be presented. Psychotherapy outpatients (N = 69) were assessed 10 times a day over a period of 7 days. Associations between entrapment and suicidal ideation as well as cross-level interactions with PB and TB were analyzed. Results: Preliminary results before CBT show that entrapment is associated with suicidal ideation at the same assessment and the change in suicidal ideation since the last assessment. We find no significant associations with (the change in) suicidal ideation at the next assessment and no significant cross-level interactions with PB or TB. However, significant random slopes models (for all models) indicate individual differences for the relation between entrapment and suicidal ideation. Participants with higher suicidal ideation show larger associations than participants with lower suicidal ideation. Discussion: In line with the statement of the IMVM, we found an association between entrapment and concurrent suicidal ideation as well as suicidal ideation over time. Although entrapment was not found to have prospective predictive power when controlling for suicidal ideation, participants reporting higher suicidal ideation showed stronger associations between entrapment and (the change in) suicidal ideation at the next assessment. Implications for clinical practice and future research will be discussed.