NDIS annual cost
â An alternative way to think about the saving to the NDIS is that the NIIS eventually will provide care and support to around 30,000 people at an annual cost of care and support of around $70,000 to $100,000 per person.â The NIIS is prospective, and there are expected to be around 30,000 people in a mature scheme.f you restrict consideration to those in severity category 5 and above (minimum cost of about $25,000 pa â perhaps a minimum of about 10 hours of care per week), this gives a weighted average annual cost of around $70,000 for care and support.