Protecting minor children is often the primary reason parents create a will. This guide explains how to combine guardian appointments with testamentary trusts to ensure your children are both raised by people you trust and financially protected.
Quick Answer
To protect minor children, appoint a guardian to raise them and create a testamentary trust to manage their inheritance until they are mature, rather than leaving them a large sum at 18.
- Appoint a guardian: Name a primary guardian plus alternates; this is a recommendation the court usually follows when deciding the children's best interests.
- Set up a testamentary trust: It holds the inheritance until a vesting age you choose (typically 21-25) instead of paying out at 18.
- Consider separating roles: For inheritances over $200,000, having different people as guardian and trustee adds accountability over how funds are spent.
- Align super and insurance: Super isn't controlled by your will, so use binding nominations (review every 3 years) so it flows to your estate and trust.
Why You Need Both a Guardian and a Trust
| Protection | Guardian | Testamentary Trust |
|---|---|---|
| Purpose | Who raises your children | How money is managed |
| Handles | Daily care, education, healthcare decisions | Inheritance, investments, distributions |
| Duration | Until children turn 18 | Until age you specify (21-30) |
| Without one | Court decides who raises children | Children get money at 18 |
Key Point: Appointing a guardian without a trust means your children could receive a large inheritance at 18, before they're mature enough to manage it wisely.
Appointing a Guardian
What a Guardian Does
A guardian takes on day-to-day parental responsibilities including:
- Where children live
- Education decisions
- Healthcare choices
- Religious and cultural upbringing
- General welfare and discipline
How Guardian Appointments Work
| Aspect | Details |
|---|---|
| Legal status | Recommendation to the court, not automatic |
| Court's role | Makes final decision based on children's best interests |
| Weight given | Courts give significant weight to parents' wishes |
| When effective | Only if both parents die (surviving parent has automatic rights) |
Choosing the Right Guardian
Consider these factors when selecting a guardian:
| Factor | Questions to Ask |
|---|---|
| Values alignment | Will they raise children as you would? |
| Willingness | Have they genuinely agreed to this responsibility? |
| Capability | Do they have time, space, and energy? |
| Age and health | Can they care for children for 10-18+ years? |
| Location | Would children need to move or change schools? |
| Relationship | Do your children know and trust them? |
Always Appoint Alternates
Name at least two alternates in case your first choice:
- Dies before you
- Becomes unable due to health
- Is unwilling when the time comes
- Circumstances have changed
Setting Up a Testamentary Trust
Key point
A testamentary trust created in your will holds your children's inheritance under a trustee until a vesting age you choose, instead of paying the full amount out at 18.
Why Children Shouldn't Inherit at 18
Without a trust, children receive their inheritance at 18, the age of legal adulthood. Common problems:
| Issue | Real-World Impact |
|---|---|
| Lack of financial maturity | Average 18-year-old isn't ready for large sums |
| No spending guidance | Money wasted on non-essentials |
| Vulnerable to others | Partners or friends may exploit them |
| No asset protection | Exposed to creditors, divorce claims |
How Testamentary Trusts Work
| Element | Details |
|---|---|
| Created by | Your will |
| Managed by | Trustee you appoint |
| Beneficiaries | Your children |
| Vesting age | Age you specify (18-30 or staged) |
| Until vesting | Trustee uses funds for children's benefit |
| Tax benefits | Income taxed at adult rates, not penalty rates for minors |
What the Trust Can Pay For
The trustee can typically pay for:
- Education: School fees, university, tutoring, books
- Healthcare: Medical, dental, therapy, mental health
- Housing: Rent contribution, bond, furniture
- Living expenses: Food, clothing, transport
- Activities: Sports, music, hobbies, school trips
- Capital items: Computer, car when appropriate
Choosing a Vesting Age
| Age | Best For |
|---|---|
| 21 | Smaller inheritances, mature children |
| 25 | Most families, medium inheritances |
| 30 | Large inheritances, maturity concerns |
| Staged | Large estates, e.g., 25% at 21, 50% at 25, rest at 30 |
What Happens to a Child's Inheritance Without a Trust
If you leave assets directly to a minor child and your will does not establish a trust, the child cannot legally take control of the gift while they are under 18. In practice the inheritance is held on their behalf, commonly by your executor or by a public trustee, until they reach adulthood. The full balance is then handed over outright at 18, regardless of whether the young person is ready to manage it.
A testamentary trust changes this in two important ways. First, it lets you push the vesting age beyond 18 so the funds are released at a point you consider sensible, or in stages. Second, it gives the trustee a clear, ongoing role: applying income and capital for the child's education, housing, health, and living costs along the way, rather than simply warehousing the money until a single payout date. This is why parents who want genuine control over how and when their children benefit usually pair the gift with a trust rather than leaving assets directly.
For a deeper walk-through of how these trusts are structured and taxed, see our guide to testamentary trusts in Australia.
Guardian vs Trustee: Same or Different?
| Approach | Advantages | Disadvantages |
|---|---|---|
| Same person | Simple, faster decisions | No checks on spending |
| Different people | Accountability, proper oversight | May create conflict |
| Professional trustee | Expert management, impartial | Fees (0.5-1.5%/year) |
Recommendation: For inheritances over $200,000, separate the roles. The trustee ensures funds are used for children's benefit, not absorbed into the guardian's household.
Why Separating the Two Roles Helps
The guardian and the trustee are solving different problems. A guardian focuses on raising your children day to day: where they live, their schooling, their health, and their general welfare. A trustee focuses on prudently holding and investing the inheritance and deciding when to release funds. These are different skill sets, and the person who is the warmest, most natural carer for your children is not always the best person to manage a substantial sum of money over many years.
Keeping the roles with different people also builds in accountability. When the guardian who is caring for the children has to ask a separate trustee to release funds, there is a natural check on whether spending genuinely benefits the children rather than the wider household. That separation can reduce the risk of conflicts of interest, and it can make the arrangement easier to defend if family members ever question how the money is being used. The trade-off is potential friction between the two appointees, so it helps to choose people who respect each other and to leave a clear letter of wishes explaining how you expect the trust to support the children.
For the underlying rules on appointing a guardian, see our guide to minor children and guardianship in wills, and for how super interacts with your estate plan, see superannuation and your will.
Coordinating Super and Life Insurance
Key point
Superannuation does not pass under your will by default, so a binding nomination to your estate is what lets your super flow into the testamentary trust set up for your children.
Superannuation is not controlled by your will. To ensure super flows into your testamentary trust:
| Asset | Recommended Approach |
|---|---|
| Superannuation | Binding nomination to your estate |
| Life insurance (outside super) | Beneficiary: your estate |
| Life insurance (inside super) | Same nomination as super |
Important: Review binding nominations every 3 years, they lapse. Set calendar reminders.
Quick Planning Checklist
Guardian Selection
- Identified primary guardian (had conversation, confirmed willing)
- Identified 1-2 alternate guardians
- Considered capability, values, location, age
- Both parents agree on nomination
Trust Setup
- Created testamentary trust in will
- Set appropriate vesting age
- Appointed suitable trustee
- Decided whether to separate guardian/trustee roles
Super and Insurance
- Set binding death benefit nominations
- Nominations direct to estate (flows to trust)
- Calendar reminder to renew nominations
Documentation
- Guardian wishes clear in will
- Written letter of wishes for guardian
- Executor knows where documents are stored
State-Specific Considerations
All Australian states recognise guardian nominations and testamentary trusts, governed by:
| State | Legislation |
|---|---|
| NSW | Succession Act 2006 |
| VIC | Wills Act 1997 |
| QLD | Succession Act 1981 |
| SA | Succession Act 2023 (SA) |
| WA | Wills Act 1970 |
| TAS | Wills Act 2008 |
| ACT | Wills Act 1968 |
| NT | Wills Act 2000 |
Legislation and Official Resources
Will-making in Australia is governed by each state and territory's own succession legislation. The core statutes include:
- New South Wales: Succession Act 2006 (NSW)
- Victoria: Wills Act 1997 (Vic)
- Queensland: Succession Act 1981 (Qld)
- South Australia: Succession Act 2023 (SA)
- Western Australia: Wills Act 1970 (WA)
- Tasmania: Wills Act 2008 (Tas)
- Australian Capital Territory: Wills Act 1968 (ACT)
- Northern Territory: Wills Act 2000 (NT)
Because requirements differ between states and are amended over time, always confirm the current rules for your state, or seek advice from a qualified legal professional.
Related Guides
- Minor Children and Guardianship in Wills: Complete Guide – In-depth coverage
- Testamentary Trusts Australia – Detailed trust guidance
- Blended Family Will Planning – Children from different relationships
- Will Executor Role – Choosing who administers your estate
Protect Your Children with WillBuddy
WillBuddy's guided process helps you:
- Select appropriate guardians
- Set up testamentary trusts with proper vesting ages
- Coordinate guardian and trustee appointments
- Document your wishes clearly
Reviewed and current as at 12 June 2026.
This article is general information only and is not legal advice. Laws change over time and vary between Australian states and territories, so always confirm the current position and consider advice from a qualified legal professional for your specific circumstances.