Background Nurses' understanding of their scope of practice is essential for coordinating safe and optimal home-based care for older people with complex needs. Contextual modulators, workload pressures, and limited opportunities for clinical leadership may hinder enactment of core aspects of this scope. Uncertainty regarding nurses' scope of practice persists, particularly in home-based care. The aim of this study was to explore how nurses experience their own and each other's scopes of practice, and what characterises their scope of practice in home-based care. Methods A qualitative descriptive design using focused individual interviews was employed with eight registered nurses and eight non-registered nurses from three home-based nursing teams in south-east Norway. Although interviews were conducted individually, data were analysed dyadically using an adapted Framework Method to enable systematic comparison of perspectives. Results Nurses' scope of practice was characterised by ongoing clinical observation, assessment, and response to change, supported by continuity of visits and in-depth knowledge of service users. Activities ranged from household chores and basic care to advanced clinical procedures, with substantial overlap between the nurses. Registered nurses articulated greater analytic depth and system-level accountability. Despite shared conceptual understandings, nurses experienced a parallel scope of practice with divergent responsibilities. Registered nurses assumed primary accountability in acute, complex, and transitional care situations, and tensions were evident regarding responsibility distribution and decision-making. Conclusions Scope of practice in home-based care was dynamic and context-dependent, enacted through an embodied nursing process reflecting rapid, experience-based cognition and analytic decision-making. Although nurses described shared understandings, enactment involved overlapping activities alongside distinct responsibilities. Registered nurses' scope of practice extended beyond direct care to coordination, clinical leadership, and accountability for care completion. These findings highlight risks of implicit responsibility shifting and emphasise the need to clearly define and empirically ground nurses' scope of practice to support safe practice, leadership, workforce sustainability, and future research on continuity, responsibility, and decision-making in complex care settings.