What "substantially reduced functional capacity" means when pain is the primary issue
Observations drawn from published tribunal and court reasons. Not legal advice. Every file turns on its own facts.
The term
Section 24(1)(c) of the NDIS Act requires that the impairments result in substantially reduced functional capacity to undertake, or psychosocial functioning in undertaking, one or more of six activities: communication, social interaction, learning, mobility, self-care and self-management. The thresholds are set out in rule 5.8 of the NDIS (Becoming a Participant) Rules 2013.
Pain is not one of the six. Nothing in this test asks how much pain there is.
The question it actually asks
The scheme is built on function rather than condition, and the cases are unusually clear about it.
In Mulligan v National Disability Insurance Agency [2015] FCA 544 (the first NDIS matter to reach the Federal Court), Mortimer J held that the Tribunal was right to direct itself to the applicant's impairments rather than his diagnoses, and described a legislative scheme based on a functional, practical assessment of what a person can and cannot do. Mr Mulligan had chronic ischaemic heart disease, cardiomyopathy, Conn's syndrome and sciatica, maintained part-time work, used a walking stick and rails, and relied on daily assistance from his wife. The Tribunal had found he did not meet s 24(1). The Court found legal error and remitted the matter.
JLZT and National Disability Insurance Agency [2022] AATA 541 restated the framework at [16]:
Consistent with the scheme of the NDIS Act, which is based on a functional, practical assessment of what a person can and cannot do, the term disability, for the purposes of s 24 at least, refers to the overall effect of a person's impairments on that person's abilities to participate in all aspects of personal and community life, whereas the term impairment, on which s 24 operates, involves the loss of or damage to a physical, sensory or mental function. The assessment to be undertaken is functional and multi-faceted, and it requires a relatively high degree of precision.
That last clause is the most useful sentence in this area of law. A relatively high degree of precision. It is the authority for why "significantly limits activities of daily living" does no work, and why a file full of impressionistic description fails a test it should have satisfied.
What the decisions settled
"Substantially" means considerable or sizeable
JLZT held at [79] that the phrase refers to a considerable or sizeable reduction in the person's functional capacity, or their psychosocial functioning, in undertaking one or more of the listed activities. The Tribunal also observed that "psychosocial functioning" is not given any particular meaning in the legislation: a gap worth knowing about, because it is undefined ground where pain-related cognitive and emotional consequences may be argued.
One activity is enough
The threshold need only be met in one of the six. This matters more than it sounds. A file that tries to establish moderate limitation across all six is weaker than a file that establishes considerable limitation in one and documents it precisely.
Choosing which domain to run is a strategic decision, and it should be made from the evidence rather than from which limitation feels most significant to live with.
Fluctuating capacity can satisfy the test
In JLZT the Tribunal found at [74] that the applicant's impairments fluctuated and were, or were likely to be, permanent, and went on to find the capacity threshold met. Fluctuation is not a barrier to either limb.
A pain case that succeeded, and why
Arnel and National Disability Insurance Agency [2019] AATA 4778 is worth knowing because it went the other way. The Tribunal set the NDIA's decision aside and substituted a finding that the applicant met the access criteria.
The applicant had complex regional pain syndrome, which the Tribunal recorded at [20] as a condition in which the body's pain signalling mechanisms begin to operate in a highly abnormal fashion, in her case following minor surgery, with pain that started in one region and kept spreading.
The NDIA argued at [108] that she had no impairment resulting in substantially reduced functional capacity, and that to the extent she needed supports they were commonly used items or were more appropriately provided by the health system. The Tribunal rejected that at [113]:
Given the findings of permanency, being a severe disability and that the Applicant suffers constant and disabling pain, together with the fact that there are supports that the Applicant will require which cannot be provided by the healthcare system or commonly used items as contended by the Respondent, the Tribunal finds that on the preponderance of evidence the Applicant is likely to require support under the NDIS for her lifetime.
The structure of that finding repays attention. Permanency established, severity established, and then the decisive element: specific supports identified that the health system could not provide. The case was not won by demonstrating that the pain was severe. It was won by naming what was needed and showing where it could not come from.
Future eligibility elsewhere is not a bar
In JLZT the Agency argued that because the applicant, as an Aboriginal person, might become eligible for aged care support at 50 or 55, the lifetime support threshold could not be met. The Tribunal rejected it at [137] as proceeding "on the rather extraordinary basis that any person who may at some point in their life become eligible for the provision of support under the My Aged Care program is to be excluded from the Scheme."
What this means for what has to be on a file
Precision is the standard, and it is a legal standard. After JLZT, vagueness is not a stylistic weakness in a report. Named activity, specific limitation, frequency, and consequence: that is what the assessment is required to be.
Run one domain properly rather than six loosely. Establish considerable or sizeable reduction where your evidence is strongest, and document the others as supporting rather than spreading the case thin across all of them.
Name the supports, and show where they cannot come from. This is the lesson of Arnel set against McFarlane. Establishing that pain exists and is severe does not answer the health-system argument. Identifying particular supports that the health system does not and will not provide does.
Self-management is usually the underworked domain. Medication management, appointment coordination, planning, financial administration and risk recognition all sit inside it, and all are affected by pain, sleep disruption and fatigue in ways that are clinically well recognised and almost never documented.
One thing in motion
There is a legislative proposal that would define "functional capacity" in the Act for the first time, and allow Rules to prescribe both the criteria for assessing it and the tools used to measure it. The evident intention is a standardised assessment replacing reports from treating practitioners, with the possibility of applying it to existing participants.
For fluctuating conditions the risk in any single standardised instrument is obvious: it captures a day. This entry reflects the position as at the date shown and will be revised when the outcome is known.
Where this leaves your file
If your condition is documented and its functional consequences are described impressionistically, the gap is in functional evidence, and after JLZT that is a shortfall against a legal standard, not a matter of style.
If the functional material is present but no domain was ever run properly, the problem is translation. The case may be spread across six activities where it needed to be established in one.
If your file establishes severity but never identifies the supports you need, that is the Arnel point, and it is the most common reason a well-evidenced pain case still fails.
An Evidence Audit identifies which of these applies to you, in writing, with the reasoning set out. If you would rather work out whether that fits your situation by talking it through first, the introductory call is free.
Observations drawn from published Tribunal and Court reasons, current as at the compilations cited. Nothing here is legal advice, and nothing here predicts an outcome. Every file turns on its own facts.