Background: A health promotion approach to end-of-life (EoL) care is gaining traction internationally. However, there is a lack of evaluations of the impact of this approach, particularly regarding community-based initiatives. Conceptualizations of impact in participatory action research (PAR) may contribute to understanding ways in which impact can be investigated in community-based health promotion approaches to EoL issues. We aim to investigate impact and the process of impact development in our community-based PAR project, Studio DoBra, a Swedish health promotion initiative to engage communities in EoL issues. Methods: We do this through a qualitative framework analysis expanding on Banks et al.'s theory of co-impact in PAR, based on longitudinal empirical data of Studio DoBra. Studio DoBra was developed in partnership with a range of community organizations and engaged children (9 years old) and older adults (most 80+) with topics related to dying, death, and loss through arts activities. The analyzed empirical data reflect the perspectives of community-partners and academic partners from interviews and meetings spanning 4.5 years. Findings: We present a model of impact development consisting of impact on individual and group development, action-oriented impact, and strategy-oriented impact; ways they relate to and evolve from one another; and how they may be affected by contextual influences. Conclusion: Besides contributing to conceptualizations of impact in PAR, findings contribute a community perspective to the limited literature investigating the impact of health promotion initiatives related to EoL issues.