Understanding “Reasonable and Necessary”

Key Points:

• The NDIS reasonable and necessary criteria is used to decide which supports can be funded under an NDIS plan.
• Supports must relate directly to a participant’s disability, goals, independence, and daily participation to meet NDIS requirements.
• Understanding how funding decisions are made can help participants prepare stronger evidence and navigate reviews more confidently.
• An experienced NDIS plan manager can help participants understand their funding and work effectively with the NDIS system.

Summary

Understanding the meaning of NDIS reasonable and necessary can help participants feel more confident when navigating their plans and funding decisions. The article explains how the NDIS reasonable and necessary criteria influences what supports are approved, declined, or reviewed, and why clear evidence and goal-setting matter. With guidance from an experienced NDIS plan manager and trusted NDIS plan management providers like AIIM  Choices, participants can better understand the system and make more informed decisions about their supports.

Outline:

1. What does “reasonable and necessary” actually mean?
2. Why does “reasonable and necessary” exist?
3. What does the NDIS actually look at?
4. Why this matters more than you think
5. How will this affect you and your plan
6. What this means for you moving forward
7. A quick check – “reasonable and necessary”
8. Successfully navigate “reasonable and necessary” with AIIM Choices Plan Managers

“Reasonable and necessary” – what does this phrase mean exactly?

More jargon… but it has a very important purpose.

There is a moment most people have in the NDIS where they pause and think, “Why do I have to justify this?” Nearly every time, the answer comes back to one phrase from the NDIS: Is it reasonable and necessary.

Let’s walk through what the NDIS reasonable and necessary criteria actually mean, not just in policy terms, but in real life.

What does “reasonable and necessary” actually mean?

“Reasonable and Necessary” means the NDIS will only fund supports that are genuinely needed because of your disability, and that are fair, effective, and appropriate for your situation. It is not about what would be nice to have. It is about what helps you live your life, work towards your goals, and participate more independently. In simple terms, NDIS reasonable and necessary mean that the support needs to be clearly linked to your disability, help you move forward, build your independence, be likely to work, represent good value for money, and not be something everyone is expected to pay for in everyday life.

Why does “reasonable and necessary” exist?

From the NDIS perspective, this isn’t just a guideline (quoting Jack Sparrow – Pirates of the Caribbean), it is the foundation of how every decision is made.

The NDIS is required to take “reasonable and necessary” into account when deciding what supports can be funded. That means every support in your plan must meet a clear set of criteria, not just because it would be helpful, but because it fits within what the scheme is designed to fund.

At its core, the NDIS is there to fund disability-related supports, not everything in your life.

It was designed to make decisions fair and consistent, ensure funding is used for disability-specific needs, and to protect the sustainability of the scheme for everyone.

It’s not there to make things harder.

It’s there to make sure the system works for you, and for the long term.

What does the NDIS actually look at?

When the NDIS decides if something is “reasonable and necessary,” they are not asking whether something is a good idea.

They are asking whether it meets specific criteria.

From the NDIS guidelines, a support must:

• Be directly related to your disability
• Help you work towards your goals
• Support your independence or participation in daily life
• Be effective and likely to benefit you
• Represent value for money
• Consider what support is already available through family, community, or other systems not be a general day-to-day cost unrelated to your disability

This is where it can feel frustrating. We understand something might be helpful… but still may not meet the NDIS criteria. This distinction matters in how decisions are made.

Why this matters more than you think

This isn’t just a checklist sitting behind the scenes. This is what shapes your entire plan. It influences:

• What gets approved
• What gets declined
• How much funding you receive
• How your goals are interpreted
• What evidence you need to provide

Even when a health professional recommends a support, the NDIS still has to assess whether it meets the criteria. NDIS will also take into account the item, therapy or service to ensure it is cost-effective.

So it’s not just about what you need. It’s also about how that need is explained and justified to the NDIS.

How will this affect you and your plan

This is where it becomes real. Since “reasonable and necessary” is not just a concept and will directly impact your day-to-day experience with the NDIS.

You might notice it when:

• A support is approved – because it clearly links to your goals and disability.
• A support is declined – because it’s seen as a general life expense, not disability-specific.
• You’re asked for more reports or evidence because the NDIS needs to understand why something meets the criteria.
• Your plan feels smaller or more structured than expected, because funding must align with these rules.

With recent changes to the NDIS, there is also more structure around what can and cannot be funded. There are clearer boundaries between disability supports and everyday living costs.

This means the system is becoming more defined. Not necessarily less supportive but more structured.

What this means for you moving forward

Understanding NDIS “reasonable and necessary” is not just about the rules. It’s about how you navigate your plan. When you understand this framework, you can:

• Explain your needs in a way that aligns with the criteria
• Connect every support back to your goals
• Prepare stronger evidence for reviews
• Ask better questions when something is unclear
• Feel more confident in conversations with the NDIS

Because you’re no longer guessing how decisions are made. You understand the lens they are using.

A quick check – “reasonable and necessary”

If you’re ever unsure, all you need to do is confirm the following:

• Is this support clearly linked to my disability?
• Does it help me move towards my goals?
• Can I explain why it is needed, not just helpful?

If your answer to these questions is yes, then you are already on the right track.

Regular communication with your NDIS plan manager can help keep on top of your understanding, and can help you make effective decisions that help you reach your NDIS goals. 

Successfully navigate “reasonable and necessary” with AIIM Choices Plan Managers

The NDIS was designed to support independence, participation, and a better quality of life.

“Reasonable and necessary” is the structure that holds that together.

It can feel restrictive at times. But when you understand how it works, it becomes something you can work with.

And that’s where confidence starts to come back into the process. If you have questions about how the NDIS reasonable and necessary criteria may affect your funding, supports, or plan decisions, the team at AIIM Choices Plan Managers is here to help. 

Our experienced NDIS plan management providers support participants across Melbourne, Sydney, Brisbane, Perth, Darwin, and Albury-Wodonga, helping you better understand your plan and make informed decisions with clarity and confidence. 

Reach out to AIIM Choices Plan Managers today and let us help you make the most of your NDIS journey.