Guardianship of Adults Act 2016 NT: What It Means for Advance Care Planning

What the Guardianship of Adults Act Does

The Guardianship of Adults Act 2016 (NT) governs when and how the Northern Territory Civil and Administrative Tribunal (NTCAT) can appoint a guardian or financial manager to make decisions for an adult who has lost decision-making capacity. It is the safety net — the system that kicks in when an individual has not made their own arrangements through an Advance Personal Plan.

The Act replaced the earlier Adult Guardianship Act 1988 and modernized the Territory's approach to protecting vulnerable adults. Its central principles are that an adult's autonomy should be preserved as far as possible, that any intervention should be the least restrictive option, and that the adult's own wishes — even those expressed informally — should be considered in every decision.

For advance care planning, the Act matters because it defines the boundary between self-determined planning and tribunal-imposed authority. If you have an Advance Personal Plan under the Advance Personal Planning Act 2013, the Guardianship Act generally stays in the background. If you do not, this Act provides the framework for NTCAT guardianship and financial-management orders, while health-care decisions for an adult with impaired capacity are governed by the Health Care Decision Making Act 2023.

How It Interacts With the Advance Personal Plan

The relationship between the two Acts is designed to be complementary. An APP is the proactive instrument — you create it while you have capacity, appointing decision-makers of your choosing and documenting your healthcare preferences. The Guardianship Act is the reactive instrument — NTCAT steps in only when there is no adequate private arrangement in place.

Under the Health Care Decision Making Act 2023, which commenced on 1 July 2024, the three Acts now form an integrated framework. The 2023 Act established a statutory hierarchy of healthcare decision-makers that draws directly from both the APP Act and the Guardianship Act:

1. An appointed decision-maker under an active APP with relevant health-care authority
2. A guardian appointed by NTCAT with healthcare authority
3. A relative recognized under Aboriginal customary law
4. A spouse or de facto partner
5. A non-commercial carer, adult children, parents, siblings, or close friends
6. The Public Guardian

An NTCAT-appointed guardian sits at position two — below an APP decision-maker but above all informal family relationships. This means that if NTCAT appoints a guardian for someone who already has an APP, the APP decision-maker still takes priority for any matters within their appointment. But if the APP does not cover a particular type of decision, or if the APP is found to be invalid, the guardian's authority fills the gap.

When NTCAT Appoints a Guardian

NTCAT will consider appointing a guardian when three conditions are met:

1. The person has impaired decision-making capacity for the relevant type of decision
2. The person's needs are not being adequately met through informal arrangements or an APP
3. A guardianship order is necessary and would be the least restrictive option

Applications are filed on NTCAT Form AG1 (for guardianship matters under the Guardianship Act) or Form AG8 (for matters under the APP Act). Filing is free. The person who is the subject of the application has the right to attend the hearing, to be represented, and to have their views considered.

NTCAT can appoint a private guardian — typically a family member or close friend — or, if no suitable person is available, the Public Guardian. A guardianship order can cover lifestyle decisions, healthcare decisions, or both. It can also appoint a financial manager for the person's property and financial affairs.

The critical point for families: a guardianship order can override an APP decision-maker if NTCAT is satisfied that the decision-maker is acting contrary to the person's interests or has breached their duties. This is rare, but it means the APP is not an absolute shield — it is only as strong as the person appointed to carry it out.

Avoiding Guardianship Through Proactive Planning

The single most effective way to avoid a guardianship order is to create a comprehensive APP while you have capacity. An APP that appoints trusted decision-makers, specifies their authority across financial, lifestyle, and healthcare matters, and includes detailed Advance Consent Decisions about medical treatment leaves NTCAT with very little reason to intervene.

The scenarios where guardianship becomes necessary despite an APP typically involve:

• No APP at all. The person never created one, or created one under a different state's laws that may require review before it is relied on in the NT.
• The APP does not cover the decision needed. A narrowly drafted APP that only appoints a healthcare decision-maker leaves financial matters uncovered.
• The appointed decision-maker is unavailable or unsuitable. The person named in the APP has died, moved overseas, or is themselves incapacitated.
• Abuse or exploitation. NTCAT may revoke an APP and appoint a guardian if the decision-maker is financially exploiting or neglecting the person.

For families with aging parents in the NT, the practical takeaway is that a well-drafted APP with at least one alternate decision-maker substantially reduces the risk of tribunal intervention. The split-document strategy — separate APPs for financial and healthcare matters — is particularly useful here, because it allows different people to be appointed for different types of decisions, reducing the chance of a single-point-of-failure.

The First Nations Dimension

The Guardianship Act's interaction with Aboriginal customary law is one of the most progressive features of the NT's framework. Under the 2023 hierarchy, a relative recognized by customary law or tradition sits at position three — above a spouse or de facto partner and below only an APP decision-maker and an NTCAT-appointed guardian.

This means that for an Indigenous adult in a remote community who lacks capacity and has no formal APP, the community's own kinship structures provide lawful decision-making authority without requiring a tribunal application. The Guardianship Act's safety net is there if those structures fail, but the 2023 reforms ensure it is not the first resort.

What This Means for Your Planning

The Guardianship of Adults Act 2016 is the legislation you want to never need. An APP created under the Advance Personal Planning Act 2013 keeps decision-making authority in the hands of people you have chosen, in the terms you have defined. The Northern Territory Advance Directive & Living Will Kit guides you through creating a comprehensive APP that covers financial, lifestyle, and healthcare decisions — closing the gaps that lead to tribunal intervention and ensuring your plan is robust enough to withstand scrutiny if it is ever challenged.

See more Northern Territory guides →