What evidence does the NDIS need? Functional impact explained

When you apply for the NDIS, a diagnosis is only part of the picture. The National Disability Insurance Agency (NDIA) also wants to know how your disability affects everyday life. This is called functional impact, and it is often where applications are weakest.

This guide explains what NDIS evidence the NDIA asks for, what functional impact means, and how you and your health professionals can describe it clearly. It is general information, so please speak with a qualified professional about your own situation.

Why a diagnosis alone is usually not enough

Two people with the same diagnosis can have very different lives. One may need help every day. The other may need very little. This is why the NDIS focuses on how your impairment affects what you can do.

The NDIA keeps lists of conditions to help with decisions. Its Applying to the NDIS guideline says that if you have a condition on List A, the NDIA will likely decide you meet the disability requirements. For conditions on List B, the NDIA will likely accept the impairment is permanent, but you still need to show that it substantially reduces your ability to do everyday tasks.

For most people, then, functional evidence is what the decision turns on.

What functional impact means

Functional capacity is your ability to do everyday activities without help from other people, or with only commonly used equipment. The NDIA’s disability requirements ask whether your impairment substantially reduces your ability in one or more of these areas.

The applying guideline describes substantially reduced capacity as usually needing disability-related support to take part in or complete these activities. That support may be help from other people or assistive technology.

What good NDIS evidence looks like

The NDIA says supporting evidence should cover four things:

1. your disability and impairment
2. the impact of your disability on different areas of your life
3. previous treatments and what happened
4. future treatment options.

The NDIA also says good evidence is recent and comes from a treating health professional relevant to your primary disability. Its guidance on gathering evidence says evidence should be original and specific to you, from a professional registered to practise in Australia or New Zealand who has treated you for at least 6 months.

Informal evidence counts too

You do not always need a formal report. The NDIA accepts a completed supporting evidence form, existing reports and assessments, or a letter or email from your professional. You, your family and your carers can also describe how your disability affects your daily life.

Standardised assessment tools

A standardised assessment compares your results with a large group of people and follows set instructions. This makes results easier to compare and harder to misread. The NDIS lists example assessment tools for different disabilities, including:

• Vineland Adaptive Behavior Scales (Vineland-III), WHODAS 2.0 and PEDI-CAT for intellectual disability and autism
• the Care and Needs Scale (CANS) and WHODAS 2.0 for acquired brain injury in people aged 17 and over
• LSP-16, HoNOS and WHODAS for psychosocial disability.

Cognitive tests, such as intelligence and memory tests, can also show how an impairment affects learning, memory and problem-solving. Test scores are most helpful when the report links them to real tasks in your life. For example, a report might explain how slow processing speed affects following instructions at work.

How to describe daily life clearly

General statements are easy to write but hard for the NDIA to use. Specific examples show what support you actually need. Here are some examples of the difference.

These examples are made up to show the style. Your evidence should describe your own life. Useful details include:

• what you can and cannot do in each area
• how often you need help, and who gives it
• what happens when help is not there
• how things look on harder days, not just good days
• any safety risks.

Be honest and accurate. Evidence that overstates or understates your needs does not help you in the long run.

Common gaps in NDIS evidence

Applications are often delayed or refused because something is missing, not because the person has no disability. Common gaps include:

• A diagnosis with no detail about daily life. A letter that only names a condition does not show functional impact.
• No treatment history. The NDIA needs to know what has been tried and whether more treatment is likely to help.
• No comment on permanence. Your professional should say whether the impairment is likely to be lifelong, and why.
• Reports that disagree. If one report says you manage well and another says you need daily help, explain why, for example a recent change.
• Only describing good days. Many people downplay their needs. Describe a typical week, including the harder days.

If the NDIA asks you for more information, it will tell you what it needs and how long you have to provide it.

Changes to NDIS access from 2028

The NDIS laws changed in October 2024 and again in August 2026. Under the Securing the NDIS for Future Generations changes, the NDIA says access decisions for new applicants will be based on a new standardised, evidence-based assessment of functional capacity from 1 January 2028.

How that assessment will work is still being designed. Until then, the current evidence guidance applies. Check the NDIS website for updates before you apply.

Invictus Health 能提供哪些協助

Our psychologists and neuropsychologists provide NDIS assessments and reports using standardised tools. Reports describe how an impairment affects everyday tasks across the six areas the NDIA looks at.

Where thinking skills are a concern, a neuropsychological assessment can measure memory, attention, planning and learning. Our NDIS 申請 service can help you understand which evidence you already have and what may be missing.

An assessment adds information. It does not guarantee NDIS access or funding. The NDIA makes that decision. See our fees page for costs.