Concordance between partner reports of Intimate Partner Violence (IPV) is generally low, but self-reporting of IPV and concordance between partners among expectant parents in marginalized communities has not been explored, nor have associations among each partner’s reports of IPV and their behaviors in observed conflict discussions. This study will examine these gaps. One hundred and thirty-eight low-income, unmarried, Black, coparenting dyads expecting their first child together (136 mothers and 136 fathers) completed the Revised-Conflict Tactics Scale and a video recorded and coded conflict discussion. There was low concordance between parent’s reports of IPV overall with moderate levels of concordance for coparents who were living together and had more harmonious relationships. Linear regression analyses indicated only mothers’ reports of fathers’ psychological and physical IPV but not fathers’ reports of IPV were significantly associated with observed negative communication. Neither coparents’ reports of psychological or physical IPV were associated with positive communication during a conflict discussion. These findings suggest that at the time of parenthood transitions, mothers’ reports of fathers’ IPV behaviors may be more robust in their association with negative/unhealthy couple communication patterns than fathers’ reports and should be used when making safety determinations with families.