What counts as good evidence of disability for the NDIS?
Good evidence of disability for the NDIS is recent, is completed by a treating health professional who is relevant to your primary disability, confirms that primary disability, confirms how it affects different areas of your life, and describes past and future treatments and their outcomes. In short, it does not just name a condition. It shows the impairment, its impact and whether it is expected to continue. Only the NDIA decides eligibility.
This guide walks through those features one at a time, using the NDIA’s own description of good evidence, so you can look at your documents and see roughly where they stand.
The features of good evidence
The NDIA sets out what good evidence looks like on its page about providing evidence of your disability. Good evidence is:
- Recent. It reflects your current situation, not a snapshot from many years ago that may no longer describe how things are now.
- Completed by a treating health professional relevant to your primary disability. The person writing it should be an appropriate professional for the impairment that affects your life the most.
- Confirms your primary disability. It clearly names and describes the primary disability, rather than leaving it implied.
- Confirms the impacts on different areas of your life. It describes how the impairment affects your everyday activities, not just the diagnosis.
- Describes previous treatments and outcomes. It explains what has already been tried and what happened.
- Describes future treatment options and expected outcomes. It sets out what options remain and what is expected from them.
Reading that list, you can see the shape of what the NDIA is after. It wants a current picture, from someone who knows you, that connects the impairment to real daily impact and explains where things sit with treatment and support over time.
What "primary disability" means
The NDIA uses the term primary disability to mean the impairment that has the greatest impact on your daily life. If you live with more than one condition, the primary disability is the one that affects your everyday activities the most. This matters because the main evidence should come from the professional who is the most appropriate person for that primary disability.
The NDIA also says the treating professional who provides your evidence should have treated you for a significant period, giving at least six months as an example. The idea is that someone who has worked with you over time can describe your situation more fully than a one-off appointment can.
Who can provide it
Evidence usually comes from the treating professionals you already see. The NDIA gives common examples, including a GP, paediatrician, occupational therapist, speech pathologist, neurologist, psychologist, psychiatrist and physiotherapist. There is no single "right" professional. It depends on your primary disability and who is the most appropriate person to describe it.
It is worth remembering something the NDIA states plainly. The person helping you gather your evidence cannot tell you whether you meet the eligibility requirements. Only the NDIA can make that decision.
Your evidence can be documents you already hold
Good evidence does not have to be a brand new report written from scratch. The NDIA says a treating professional can provide evidence by completing its supporting forms, or by providing existing reports, assessments or letters that show the impact of your disability. So an assessment from a while ago, a specialist letter, or a therapy report may already carry a lot of what is needed.
If there is a gap, a treating professional may be able to confirm in writing what they already know about your situation. This is about describing or confirming existing information, not about seeking any new test or assessment.
Connecting evidence to everyday life
The part people most often overlook is the impact across everyday areas. Evidence that confirms a diagnosis but says little about daily life leaves the picture incomplete. Strong evidence describes how the impairment affects things like mobility and motor skills, communication, social interaction, learning, self-care and self-management. We cover this in detail in our guide to functional impact across everyday areas.
If you are still getting your head around what evidence is needed overall, start with what evidence do I need for the NDIS. When you are ready to take stock of your own documents, the NDIS evidence checklist gives you a calm, step-by-step way to do it. You can also browse all of our NDIS evidence guides.
See where your evidence stands
Working out whether your documents cover all of this can be hard to do on your own, especially when you are tired. Our Evidence Alignment report reads the reports and letters you already have against these features and shows where your evidence appears to be strong and where it might be strengthened before external use. It is a way to see where you stand, not a promise about your access. Only the NDIA decides that.
Frequently asked questions
How recent does my evidence need to be?
The NDIA says good evidence is recent, meaning it reflects your current situation. It does not publish a single fixed cut-off here. If a report is older, a treating professional may be able to confirm in writing whether it still describes your current situation.
What is my primary disability?
Your primary disability is the impairment that has the greatest impact on your daily life. If you live with more than one condition, it is the one that affects your everyday activities the most. The main evidence should come from the most appropriate professional for that primary disability.
Does one professional need to write everything?
Not necessarily. The main evidence for your primary disability should come from the most appropriate treating professional for it, but the NDIA also accepts existing reports, assessments and letters that show the impact of your disability. Different documents can cover different parts of the picture.
Can old reports still count?
They can. The NDIA accepts existing reports, assessments or letters that show your impact. Older documents may still be useful, and a treating professional may be able to confirm in writing whether they still reflect your current situation.