The NDIA determines what services and supports a person will be funded for under their NDIS Plan [National Disability Insurance Scheme Act 2013 (Cth) ('NDIS Act') s 34]. This decision must be consistent with the provisions of the NDIS Act, National Disability Insurance Scheme Rules and National Disability Insurance Scheme Guidelines ('NDIS Guidelines').

The services and supports that the NDIS can fund include those relating to education, employment, social participation, independence, living arrangements, and health and wellbeing [National Disability Insurance Scheme (Supports for Participants) Rules 2013 (Cth)].

For a service or support to be funded, it must be considered to be reasonable and necessary to assist the particular person.

Section 34 of the NDIS Act defines what is meant by a reasonable and necessary support:

For plans approved or varied after 3 October 2024, a reasonable and necessary support must also be a support that is necessary to address the needs of the participant arising from impairments that meet either the disability [s 24] or early intervention requirements [s 25] of the NDIS, or both.

Additional guidelines apply to the provision of particular types of supports, such as assistive technology, vehicle modifications, home modifications, and others. For more information see NDIS Guidelines: Including specific types of supports in plans.

In some instances, a participant may not be happy with the supports funded in their Plan or may disagree with a decision as to what is considered a reasonable and necessary support. They are able to seek a review of this decision [s 99], see: Review of NDIA decisions.