Common Reasons the NDIS Says No
Common reasons the NDIS says no — not reasonable and necessary, another system's responsibility, not enough evidence — and how to respond to each.
When the NDIS says no, the letter can feel blunt and confusing. But most refusals come down to a handful of recurring reasons — and once you understand which one applies to you, you know exactly what to do about it. This guide walks through the most common reasons, in plain language, and gives you a practical way to respond to each.
Why understanding the reason matters
Not reasonable and necessary
Another system's responsibility
Not enough evidence
Not related to your disability, or better value elsewhere
Turning a no into a next step
Frequently asked questions
Why did the NDIS say no?
Most refusals come down to a few reasons: a support wasn't shown to be reasonable and necessary, it was seen as another system's responsibility, there wasn't enough evidence, or it wasn't sufficiently related to your disability. Your decision letter should state the reason — read it closely.
What does 'not reasonable and necessary' mean?
It means the support didn't clearly meet the NDIS funding test — or wasn't shown to. To respond, show how the support relates to your disability, helps you pursue your goals and take part in daily life, and represents reasonable value, using concrete examples and up-to-date reports.
What does 'another system's responsibility' mean?
It means the NDIA considers the support should come from health, education, housing or another mainstream service rather than the NDIS. It's not a dead end — clear evidence that the need is disability-related and about building your capacity can change how it's viewed.
The NDIS says there wasn't enough evidence — what now?
This is the most fixable reason. Add up-to-date reports from professionals who know you, functional evidence about how your disability affects daily life, and specific real-life examples. Our guide Evidence for an NDIS appeal shows how to assemble a strong case.
How do I respond to a refusal?
Identify the exact reason in your decision letter, gather evidence that answers it directly, request an internal review within the timeframe, and get free help from an advocate or legal aid. A no is often a request for more information, not a final word.
Can I challenge more than one reason at once?
Yes. A decision may raise several points, and your response can address each one — showing the support is disability-related, reasonable and necessary, and backed by evidence. Working through them point by point, with an advocate's help, is a sound approach.