How to Appeal an NDIS Decision in 2026: Step-by-Step Guide

Receiving a decision that cuts your NDIS funding, rejects your access request, or removes a support you depend on is one of the most stressful experiences a participant or family can face. The phone call, the letter, the sinking feeling — and then the question: what do I do now?

The answer is: you appeal. And you are more likely to succeed than you think.

Every year, thousands of NDIS participants challenge decisions made by the National Disability Insurance Agency (NDIA) — and a significant proportion of those challenges result in better outcomes. This guide explains the full appeal process in plain English: what your rights are, which pathway to use, how to build a strong case, and what to do at every step from the first phone call to a tribunal hearing.

What Decisions Can You Appeal?

Not every outcome is formally reviewable, but most significant decisions are. Under the NDIS Act, the following are all reviewable decisions — meaning you have the right to formally challenge them:

• Access decisions: You applied to the NDIS and were told you do not meet the eligibility criteria
• Plan funding decisions: Your approved plan has less funding than you need, or key supports were not included
• Plan review outcomes: You requested a plan review and the new plan is worse than, or the same as, the old one
• Support category decisions: A specific support type was excluded from your plan
• Plan management decisions: You were denied self-management or plan management against your preference
• Unilateral plan changes: The NDIA changed or cancelled your plan without a formal review process
• Registered provider decisions: A provider's registration status was changed in a way that affects your supports

The Three-Stage Appeal Pathway

The NDIS appeal process has three main stages. Most participants start at Stage 1 and only move to later stages if they are not satisfied with the outcome. Each stage is progressively more formal — but also more powerful.

• Stage 1 — Internal Review: The NDIA reconsiders its own decision. Free, relatively fast, and the right first step for almost everyone.
• Stage 2 — Administrative Appeals Tribunal (AAT): An independent tribunal reviews the decision. More formal, but you can represent yourself and it is still free.
• Stage 3 — Federal Court: Only for legal errors in the AAT decision. Very rare. Requires a lawyer.

Stage 1: Requesting an Internal Review

An internal review is where a different NDIA delegate (not the person who made the original decision) looks at the decision again from scratch. It is the fastest, lowest-barrier way to challenge an outcome — and it is where most successful appeals begin.

Step 1: Get the Statement of Reasons

Before you can argue against a decision, you need to understand exactly why it was made. You have the right to request a Statement of Reasons — a written explanation from the NDIA detailing what evidence they relied on and what rules they applied.

Call the NDIA (1800 800 110) or write to them and ask specifically: "I am requesting a Statement of Reasons for the decision dated [date] regarding [your name and NDIS number]." They must provide this within 28 days.

Step 2: Request the Internal Review in Writing

You can request an internal review by phone, but always follow up in writing so you have a record. Send an email or letter to the NDIA stating:

• Your full name and NDIS participant number
• The date of the decision you are disputing
• That you are formally requesting an internal review under section 100 of the NDIS Act 2013
• A brief, clear statement of why you believe the decision is incorrect

Step 3: Gather and Submit New Evidence

The internal review is not just about arguing that the original decision was wrong — it is about giving the NDIA new information they did not have, or better-framed information that clearly shows why you need the supports you are seeking.

The single most common reason NDIS appeals succeed is stronger functional evidence. Here is what to prioritise:

• Functional impact reports from treating therapists: Occupational therapists, physiotherapists, speech pathologists, and psychologists can write functional capacity reports that directly address NDIS funding criteria. Ask them to use the language of "functional impairment" and describe how your disability affects daily activities.
• Specialist medical reports: Your GP's letter is a starting point, but specialist reports (neurologist, psychiatrist, paediatrician) carry more weight for complex or less visible disabilities.
• Carer statements: A detailed written statement from a family member or carer describing what daily life actually looks like — what supports are needed, how long tasks take, what happens when support is not available — is highly persuasive.
• Your own statement: Write a first-person account of how the decision affects your daily life. Be specific: not "I need help with personal care" but "without support, I cannot shower safely or manage my medication schedule, which resulted in two hospital admissions last year."
• Evidence of what happens without the support: Hospital admissions, crisis incidents, documented deterioration in health or wellbeing, school reports, police or emergency service contacts — any documented evidence of the consequences of inadequate support.
• Provider quotes or service agreements: If you are seeking a specific support, get a formal quote or draft service agreement from a provider to demonstrate the real cost.

Stage 2: Applying to the Administrative Appeals Tribunal (AAT)

If you are not satisfied with the internal review outcome — or if 28 days pass without a decision — you can apply to the Administrative Appeals Tribunal (AAT). The AAT is an independent body that reviews government decisions. It is not a court, you do not need a lawyer, and there is no filing fee for NDIS matters.

How to Apply to the AAT

• Apply online at aat.gov.au, or by phone on 1800 228 333, or by post
• You must apply within 28 days of the internal review decision (or 28 days after the 28-day internal review window expires if no decision was made)
• Include your name, NDIS number, the decision you are appealing, and a brief description of why
• You will be assigned a case number and a case manager

What Happens at the AAT

The AAT process has several stages before any formal hearing. Most matters resolve before reaching a full hearing:

• Conciliation: A neutral AAT conciliator brings you and the NDIA together (usually by phone or video) to try to reach an agreed outcome. This resolves many matters. You can bring a support person or advocate.
• Case conference: If conciliation does not resolve the matter, a more formal case conference with an AAT member takes place. The NDIA must produce all documents it relied on.
• Hearing: If no agreement is reached, a formal hearing before an AAT member takes place. Both parties present evidence and submissions. The member then makes a decision that is binding on the NDIA.

Getting Help for Your AAT Appeal

You have the right to be supported throughout the AAT process. Consider reaching out to:

• Disability advocacy organisations: Many state-based advocacy services offer free support for NDIS appeals. Search the National Disability Advocacy Program (NDAP) directory.
• Legal Aid: In most states, Legal Aid provides free legal advice and sometimes representation for AAT hearings involving disability and NDIS matters.
• Your Support Coordinator: If you have one, your support coordinator can help you gather evidence and prepare your case, though they cannot represent you at hearings.
• Community Legal Centres: Specialist disability law services and community legal centres in each state handle NDIS matters regularly.

What Evidence Wins NDIS Appeals

After reviewing hundreds of successful NDIS appeals, a clear pattern emerges. The cases that succeed share certain characteristics. Here is what makes evidence compelling to a reviewer or tribunal member:

Functional, Not Diagnostic

The NDIS funds supports for functional impairment, not for diagnoses. A diagnosis of autism, cerebral palsy, or PTSD does not, by itself, determine funding — what matters is how the condition affects your ability to function in daily life. The strongest evidence describes what you cannot do, how long things take, what help is needed, and what happens without it.

Specific and Quantified

Vague descriptions lose appeals. Specific ones win. Compare these two statements:

• Weak: "John struggles with personal care and needs assistance."
• Strong: "John requires 45–60 minutes of hands-on assistance for showering, dressing, and morning medication management every day. Without this support, he has been unable to leave the house on 12 of the past 30 days, resulting in missed specialist appointments and two urgent calls to his GP for medication management failures."

Corroborated From Multiple Sources

A single report from a GP is easy to question. Evidence from multiple independent sources — an OT functional assessment, a specialist medical report, a detailed carer statement, and your own first-person account — is much harder to dismiss. Aim for at least three independent sources that tell a consistent story.

Directly Linked to the Support Being Requested

Every piece of evidence should connect clearly to the specific support you are asking for. If you are asking for more home-based support hours, your evidence should explain why the current hours are insufficient and what happens when support runs out. If you are asking for assistive technology, your evidence should show why it is the most appropriate solution for your functional need.

Common Reasons NDIS Decisions Are Overturned

Understanding why decisions get overturned helps you frame your appeal correctly from the start. The most common grounds for successful appeals include:

• Insufficient or outdated evidence at the original decision: The planner or delegate did not have the right reports, or relied on reports that did not describe current functioning accurately.
• Misapplication of the reasonable and necessary criteria: The delegate applied the funding criteria inconsistently or failed to consider all relevant factors.
• Failure to consider carer circumstances: Particularly for children and high-needs participants, the carer's capacity and circumstances must be considered — and often is not.
• Incorrect comparison to "typically developing" peers: For children, the NDIS must fund supports relative to what the child needs compared to peers of the same age — not just what is convenient or low-cost.
• Ignoring prior plan history: If a support has been funded in previous plans without incident, removing it without new evidence requires clear justification. Many appeals succeed by pointing to this precedent.
• Procedural unfairness: If the NDIA failed to contact you before making a decision, did not consider relevant evidence, or made the decision without giving you the opportunity to respond — this is a strong ground for overturning it.

A Timeline: What to Expect From Start to Finish

Here is a realistic timeline for the full appeal process if you need to go all the way to the AAT:

• Day 1–7: Receive decision. Request Statement of Reasons. Contact an advocacy service or Legal Aid.
• Day 7–30: Gather evidence — book OT assessment, get specialist reports, write your carer statement and personal statement.
• Day 30 (by day 90): Submit internal review request with all supporting evidence.
• Day 30–58: NDIA completes internal review (28-day timeframe). Outcome delivered.
• Day 58–86: If unsuccessful, apply to AAT within 28 days of internal review outcome.
• Month 3–6: AAT conciliation and/or case conference. Many matters resolve here.
• Month 6–12+: AAT formal hearing, if required. Binding decision issued.

Special Situations: SDA, Access Rejections, and Child Plans

Specialist Disability Accommodation (SDA) Decisions

SDA funding decisions are among the most contested in the NDIS — and among the most frequently overturned on appeal. If you were denied SDA or had SDA funding reduced, the key evidence is:

• An OT assessment specifically addressing SDA eligibility criteria and design categories
• Evidence of extreme functional impairment and the need for specialist housing features
• A housing needs assessment from a specialist SDA advisor
• Evidence that mainstream housing options cannot meet your needs

Access Rejections

If you were told you do not meet the NDIS access criteria, the appeal process is the same — but the evidence focus shifts to demonstrating that your disability is permanent or likely to be permanent, and that it substantially reduces your functional capacity. Early intervention criteria for children have different requirements again.

Child Plans

For children, the most common appeal ground is that the plan does not reflect the child's developmental needs or the evidence of their therapists. Key additional evidence for children includes school reports, early childhood educator observations, and speech pathology or OT reports that describe the gap between the child's current function and age-appropriate expectations.