Objectives: Concerns raised about the appropriateness of the National Disability Insurance Scheme (NDIS) in Australia for people with mental illness have not been given full weight due to a perceived lack of available evidence. In the Australian Capital Territory (ACT), one of the pilot sites of the Scheme, mental health care providers across all relevant sectors who were interviewed for a local Atlas of Mental Health Care described the impact of the scheme on their service provision. Methods: All mental health care providers from every sector in the ACT were contacted. The participation rate was 92%. We used the Description and Evaluation of Services and Directories for Long Term Care to assess all service provision at the local level. Results: Around one-third of services interviewed lacked funding stability for longer than 12 months. Nine of the 12 services who commented on the impact of the NDIS expressed deep concern over problems in planning and other issues. Conclusions: The transition to NDIS has had a major impact on ACT service providers. The ACT was a best-case scenario as it was one of the NDIS pilot sites.