"\"Reasonable & Necessary\": What It Really Means"

If you spend any time around the NDIS, you'll hear one phrase again and again: "reasonable and necessary." It's the test the NDIS uses to decide which supports it will fund. Yet for all how often it's said, it's rarely explained in plain words.

Understanding it helps you put together stronger requests and feel more confident at plan reviews. So whether you're in St Marys, Mortlake, or anywhere across western and inner-west Sydney, here's a warm, jargon-free guide to what it really means.

The basic idea

In simple terms, a support is more likely to be funded if it is both reasonable (sensible and fair) and necessary (genuinely needed because of a person's disability).

It's not about getting everything you might *want*. It's about funding the supports that genuinely help a person live their life, pursue their goals, and take part in the community — in a way that's fair and good value. If the wider scheme still feels unfamiliar, our plain-English guide to understanding the NDIS is a gentle place to start.

What gets considered

When deciding whether a support is reasonable and necessary, the NDIS generally looks at things like:

• Is it related to the person's disability? The support should connect to disability-related needs, not unrelated everyday costs everyone has.
• Does it help the person pursue their goals? Supports that move someone towards the goals in their plan are central.
• Is it value for money? The cost should be reasonable compared with the benefit and other options.
• Is it likely to be effective? There should be good reason to believe the support will actually help.
• Is it the right thing for the NDIS to fund? Some supports are better provided by other systems, like health, education, or everyday community services.

You don't need to tick these off like a checklist. But knowing what's being weighed up helps you explain *why* a support matters.

What it usually doesn't cover

It also helps to know the kinds of things that generally fall outside "reasonable and necessary":

• Everyday living costs that everyone has, regardless of disability
• Supports that are the responsibility of other systems, such as routine healthcare or schooling
• Anything that could cause harm to the person or others

This isn't about being mean with funding — it's about keeping the scheme focused on disability-related support.

How to make a strong case

When you're requesting a support, a few simple habits make a real difference:

• Link it to the disability. Explain clearly how the support relates to the person's disability-related needs.
• Connect it to a goal. Show how the support helps work towards a goal in the plan, whether that's building skills at home or getting out into the community.
• Bring evidence. Reports from allied health professionals, like an occupational therapist, carry real weight.
• Be specific. "Help to safely shower so I can live independently" is clearer than "more support."
• Show the benefit. Explain what the support will help the person *do* or *achieve*.

For a person in Mortlake working towards independence, or a family in St Marys seeking the right home support, clear and honest explanations make all the difference.

It's about you, not a formula

Here's a comforting truth: "reasonable and necessary" is meant to be individual. What's necessary for one person may not be for another, because everyone's situation, goals, and disability are different.

That means your story matters. The more clearly you can describe daily life, the challenges, and the goals, the easier it is to show why a support is the right fit. You're not arguing against a rigid formula — you're helping paint a true picture of what you need. Our other guides on making the most of your NDIS plan can help you put that picture into words.

A note on language

Don't be put off by the formal-sounding phrase. At its heart, "reasonable and necessary" simply asks: *is this a fair and genuinely helpful support for this person's disability-related needs?* When you frame your requests around that question, you're already speaking the right language.

We'll help you tell your story

Putting together a clear, well-evidenced case can feel overwhelming on your own — but you don't have to do it alone. At Adom Grace Care, we support people with disability and their families across St Marys, Mortlake, and the wider western and inner-west of Sydney, always in plain language and at your pace.

If you'd like help understanding what's reasonable and necessary for your situation, please contact us. You can also explore our NDIS support services to see how we can support you. There's no jargon and no pressure — just a warm conversation whenever you're ready.