The National Disability Insurance Scheme was designed to deliver individualised support to Australians with permanent and significant disability, replacing a fragmented, state-based system that many regarded as inadequate and inequitable. It was one of the most ambitious social policy reforms in Australian history. It has also become the fastest-growing area of Commonwealth expenditure, with annual costs approaching $50 billion and a trajectory that poses a genuine long-term fiscal challenge.
The Growth Drivers
Several factors explain the cost trajectory. The participant base has grown larger than projected: the scheme has attracted participants in categories — particularly autism and psychosocial disability — where assessment is complex and the boundary between eligible and ineligible is contested. Average plan values have risen as participants and their advocates have learned to navigate the system and access higher levels of support. And the market for disability services, which the NDIS funds, has developed in ways that have not always delivered value for money.
The Reform Challenge
The NDIS Review completed in 2023 recommended a fundamental redesign: moving from a scheme that funds individuals to buy support in a market, to one that provides a stronger role for government in coordinating, commissioning, and quality-assuring services. The Review argued this would deliver better outcomes for participants while moderating cost growth. Implementation has been politically contentious, with disability advocates concerned that reforms focused on cost control will reduce support for participants who need it most.
The Fiscal Stakes
If NDIS costs continue growing at current rates, they will consume an ever-larger share of Commonwealth revenue, crowding out other spending — on education, health, infrastructure, and defence — or requiring higher taxes or larger deficits. The government has set a target of moderating growth to 8 per cent per year — still fast growth, but slower than the 14 per cent of recent years. Whether that target can be achieved while maintaining support quality is the central question in Australian disability policy.
