Introduction
A testamentary trust is a trust set up inside your Will that only comes into effect when you die, holding your assets for chosen beneficiaries under terms you decide while you are alive. Australians use a testamentary trust will mainly for two reasons: tax planning for minor beneficiaries under Income Tax Assessment Act 1936 s 102AG, and shielding inherited wealth from a beneficiary's future divorce, bankruptcy, or financial mismanagement.
Quick Overview
- Definition: A trust created by a Will and activated on the testator's death.
- Three main types: Beneficiary Controlled Trust, Protective Trust, Capital Protected Trust.
- Legal basis: state Succession Acts for validity. Income Tax Assessment Act 1936 s 102AG for the minor tax concession.
- When it activates: only on death. There is no separate legal entity while you are alive.
What is a testamentary trust?
A testamentary trust is a specialised legal arrangement created within your Will that only begins to operate after you die.
When you write a standard Will, you are giving your assets directly to your chosen beneficiaries. A testamentary trust changes that. Instead of money, property, or shares flowing straight into your loved one's bank account, the assets are transferred into a trust, and a trustee manages them on the beneficiaries' behalf. Your family still gets the benefit of the wealth, but they do not personally own the assets. That separation is what makes the trust useful in Australia for both tax and asset protection.
Under each state's Succession Act, a Will must meet strict procedural requirements to be valid, and the testamentary trust clauses sit inside that same Will. The trust wakes up once probate is granted and the executor is ready to fund it.
There are three key features:
- Created by Will — The trust has no existence while you are alive. It is born from clauses written into your Will.
- Activated on death — Unlike a family trust you might run today, this trust only begins on your death.
- Trustee discretion — The trustee you appoint decides how income and capital flow to beneficiaries, which is what unlocks the tax and protection benefits.
What is the difference between a testamentary trust and a family trust?
The core difference between a testamentary trust and a family (discretionary) trust is when the trust is created.
Both are discretionary trusts, meaning a trustee decides who receives what. A family trust (often called an inter vivos trust) is set up while you are alive, usually by a deed of settlement, to run a business or hold investments. A testamentary trust is built into your Will and only begins after your death. Because Australian tax law treats inheritance income differently from ordinary trust income, a testamentary trust unlocks concessions a family trust cannot access, especially for distributions to minor children.
| Factor | Testamentary Trust | Family (Discretionary) Trust |
|---|---|---|
| When created | On your death, via your Will | During your lifetime, by a deed |
| How created | Clauses drafted into the Will; activated on grant of probate | Deed of settlement signed while you are alive |
| Tax for minor beneficiaries | Adult marginal rates with full tax-free threshold under ITAA 1936 s 102AG | Penalty rates under Division 6AA, about 45% on unearned income above the low threshold |
| Asset protection scope | Protects the inheritance you pass on after death | Protects your own current business and investment assets |
| Common scenarios | Estate planning; providing for minors and vulnerable beneficiaries | Tax splitting and asset holding during your working life |
How to choose: Use a family trust for the assets you hold today. Use a testamentary trust for the legacy you leave behind.
Is a testamentary trust the same as a simple Will?
No. A simple Will distributes assets outright to your beneficiaries, while a testamentary trust holds those assets inside a separate legal structure that the beneficiary does not personally own.
A simple Will (sometimes called an I love you Will) usually leaves everything to a spouse or children directly. Once those assets transfer, they belong to the beneficiary personally, so any future divorce, bankruptcy, or lawsuit can drag them into the fight. A testamentary trust keeps the assets one step removed. You can still give your family full benefit of the wealth, but the underlying pool stays inside the trust.
Common misconceptions:
- Incorrect: A testamentary trust is only useful for the very wealthy.
- Incorrect: My children will lose all control over their inheritance.
- Incorrect: A testamentary trust makes the estate too complicated to run.
Legal truth:
- Correct: Even a few hundred thousand dollars distributed through a testamentary trust can save your family thousands in tax every year.
- Correct: Your adult children can be the trustee and appointor of their own trusts, keeping full control over their inheritance.
- Correct: Day-to-day management is often very similar to running any other family investment account.
Important note: A simple Will offers almost no protection once assets pass into a beneficiary's name. A testamentary trust will gets you much closer to full protection for your family.
What are the main types of testamentary trusts?
There are three main types of testamentary trusts in Australia: Beneficiary Controlled, Protective, and Capital Protected.
Each type solves a different family problem. In practice, you can mix and match. One type for one child, a different type for another, depending on what each person actually needs.
Beneficiary Controlled Trust
- The adult beneficiary acts as their own trustee and appointor, giving them full control over the inheritance.
- Provides the best balance of independence and protection, because the assets sit inside the trust rather than in the beneficiary's personal name.
- Includes built-in disqualification rules that remove the beneficiary as trustee if they are sued or going through a divorce, protecting the money during a crisis.
- Best for: adult children who are financially capable and want to manage their own money.
Protective Trust
- Used when you have a vulnerable beneficiary, for example someone with a disability, an addiction, or a gambling problem.
- A third-party trustee (a sibling, a professional, or an independent advisor) manages the funds, not the beneficiary.
- The trustee decides how to spend the money on the beneficiary's behalf, so their needs are met without the funds being wasted or taken by others.
- Best for: protecting an inheritance for a beneficiary who cannot safely manage a lump sum.
Capital Protected Trust
- The standard tool for blended families and second marriages where you want to support a current spouse but protect the core wealth for children of a prior relationship.
- Splits the trust into income beneficiaries (typically the surviving spouse) and capital beneficiaries (typically your children).
- The spouse receives rent, dividends, or interest for life, but cannot sell the underlying assets or redirect them.
- On the spouse's death, the capital flows straight to your children, keeping the legacy in your bloodline.
What are the benefits of a testamentary trust will?
A testamentary trust will gives your family tax savings on minor income, asset protection against divorce and bankruptcy, multi-generational control, and a way to provide for vulnerable beneficiaries.
The most immediate benefit is the tax treatment of distributions to children. Without a testamentary trust, money left to a child and reinvested for grandchildren is taxed at penalty rates whenever income goes to the grandchildren. Inside a testamentary trust, income that originates from a deceased estate is taxed at adult marginal rates under Income Tax Assessment Act 1936 s 102AG, which can save a family tens of thousands of dollars every year.
| Benefit | How it works |
|---|---|
| Tax savings on minor income | Under ITAA 1936 s 102AG, minor beneficiaries of a testamentary trust are taxed as adults with the full tax-free threshold. You can stream around $18,200 a year to each grandchild for school fees or living costs tax-free. |
| Asset protection on divorce | Inherited assets sit inside the trust, not in the beneficiary's personal name. The Family Court often treats them as a financial resource rather than property of the marriage, which makes them harder for an ex-partner to claim outright. |
| Asset protection on bankruptcy | Trust assets generally do not vest in a beneficiary's trustee in bankruptcy, so creditors of a bankrupt beneficiary cannot seize the inheritance to pay personal debts. |
| Multi-generational planning | Capital can be preserved across generations rather than passing out of the bloodline if a child dies and leaves everything to a new spouse. |
| Control over vulnerable beneficiaries | An independent trustee can release funds in stages and on conditions, preventing inheritance from being spent at the casino, lost to addiction, or taken by people who exploit the beneficiary. |
Who should set up a testamentary trust?
A testamentary trust is most useful for parents of minor children, blended families, business owners, and anyone with a beneficiary who cannot safely manage a lump sum.
Typical situations include:
- Parents of minor children who want inheritance income taxed at adult rates under s 102AG.
- Families with a beneficiary who has a disability, addiction, gambling problem, or marriage at clear risk.
- Business owners and people with substantial assets, where multi-generational protection matters.
- Blended families and second marriages with children from a prior relationship.
Note on cost: A testamentary trust will costs more to draft and run than a standard Will. There are trustee duties, ongoing accounting, and tax filings to consider. For modest estates with adult, financially capable beneficiaries, a straightforward Will may still be enough.
If you want to see how the Family Court handles trust assets when a beneficiary divorces, see Does a Family Trust Protect Assets in a Divorce in Australia?. For the lump sum side of using a trust to support children, see What Is a Child Support Trust? Lump Sum Payments in Australia (2026). For what happens when an estate dispute overlaps with a property settlement, see What Happens If a Party Dies During Property Settlement?.
Common questions
Q: Does a testamentary trust avoid probate?
No. The Will still has to go through probate before the trust comes into effect. Probate is the step where the Supreme Court confirms your Will is valid and authorises the executor to deal with the estate. Only after probate is granted does the executor have power to fund the testamentary trust.
Q: Can the trustee also be a beneficiary?
Yes, and for a Beneficiary Controlled Trust this is by design. The adult beneficiary takes on the trustee role so they can manage the trust assets and stream income for tax efficiency, while the assets stay ring-fenced from outside claims.
Q: How long can a testamentary trust last?
Up to 80 years in most Australian jurisdictions under the rule against perpetuities. South Australia has abolished the rule, so trusts settled there can last indefinitely. The Will sets the actual term, which is often the maximum 80 years or until the youngest grandchild turns 25.
Q: Can a testamentary trust be challenged by family members?
Yes. Family Provision claims under each state's Succession Act can still reach assets held in a testamentary trust. If a spouse, child, or in some cases a stepchild proves they were inadequately provided for, the court can order provision out of the trust assets.
