Aim. To explore barriers to, and incentives for, clients on methadone-maintenance treatment (MMT) in Auckland, New Zealand to transfer from secondary care to general practitioner (GP) care. Design. Surveys (with free text response sections) of MMT secondary care staff, stabilised clinic clients, authorised GPs and GP patients. Results. High response rates from secondary care staff (77%) and GPs (74%). Barriers to stable clients' transfer included financial cost and attitudes of secondary care staff and clients. Incentives for patient transfer included confidentiality, a holistic approach to their care, continuity of care, increased patient control, convenience and avoidance of contact with other opioid-dependent people. Distrust in the quality of care provided by authorised GPs was a major barrier for some secondary care staff and their clients, despite prerequisite training for authorisation. In contrast, patients rated primary better than secondary care with none stating a likelihood to return to the secondary service within 6 months. Conclusions. Progression from secondary to primary care should be incorporated in MMT planning from the outset, with secondary services staff reassured about the quality of primary care. An integrated transition period and exploration of funding options to assist transfer from largely publicly funded secondary to largely privately funded primary care are also recommended. [Sheridan J, Goodyear-Smith F, Butler R, Wheeler A, Gohns A. Barriers to, and incentives for, the transfer of opioid-dependent people on methadone maintenance treatment from secondary care to primary health care. Drug Alcohol Rev 2008;27:178-184]