What Is a Testamentary Trust?

What Is a Testamentary Trust?

Tara Lucke

By Tara Lucke  |  October 29, 2025

Testamentary trusts are one of the most powerful estate planning tools available.

Here’s what you need to know about testamentary trusts:

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WHAT YOU NEED TO KNOW ABOUT TESTAMENTARY TRUSTS

Testamentary trusts should save your family tax after you die

☑ Testamentary trusts should protect your inheritance from divorce and bankruptcy risks

☑ Testamentary trusts are not just for complex situations or the super rich

☑ You only get one chance to access the fantastic estate planning benefits of a testamentary trust – it MUST be in your will when you die

☑ Testamentary trusts are not administratively burdensome – any extra compliance should be far outweighed by the tax savings

☑ Testamentary trusts only start working if you die – the benefits don’t start until you die but neither do the (minor) compliance requirements

☑ When in doubt, use a testamentary trust

GIVE IT TO ME STRAIGHT… WHAT IS A TESTAMENTARY TRUST?

The phrases “testamentary trust”, “testamentary discretionary trust”, TT, TDT… are all just legal jargon for a discretionary trust set up in a will that starts when the willmaker dies.


They are very similar to a family trust (more technically known as a discretionary trust) but a testamentary trust is established by a person’s will and remains dormant, ready to start when a person dies.

Trusts work by separating control of the assets held in the trust from the benefit. The person who has control of the trust assets is the Trustee.

The Trustee is the legal holder of the assets and is responsible for the day to day management of the trust and the due administration of the trust.

An effective testamentary trust should have many people who can potentially benefit from the assets in the trust (the technical term for these people are Beneficiaries) and each beneficiary’s entitlement should be at the complete discretion of the Trustee.

If you are simply a beneficiary without being a trustee, then your entitlements in the trust are at the trustee’s discretion.


Asset Protection

This discretionary nature of the trust is what makes the trust so powerful for asset protection.

Because none of the beneficiaries own the trust assets and their only right is to be considered by the trustee, it is very difficult for someone to argue that the assets of the trust belong to any one of the beneficiaries if the trustee has given real and genuine consideration to the needs and circumstances of each beneficiary.

A trustee can also be one of the beneficiaries of the trust, and if that is the case, then the trust assets will ‘look and feel’ more like that person’s assets because they are in control and can choose themselves or their family members to benefit from the trust.

What are the key benefits of a testamentary trust?

☑ Relationship protection

☑ Protects immature beneficiaries

☑ Income tax flexibility

☑ Bankruptcy protection

Income tax flexibility

Testamentary trusts offer fantastic tax flexibility.

In fact, this is the only environment where you can get such great tax treatment, and it’s only because someone had to die for the trust to start.

In essence, trusts are flow-through vehicles for tax purposes, which means the income earned each year from investing the trust assets always needs to be distributed out to the beneficiaries and each beneficiary gets taxed on the income they received from the trust at their own marginal tax rate.

Each year the trustee can choose which of the beneficiaries should receive the income earned from investing the inheritance each year, which allows them to give income to beneficiaries who have lower tax rates.

And testamentary trusts offer an additional benefit which is not available to any other trust – beneficiaries under 18 are treated like adults for tax purposes which means they can receive about $22,000 tax free each year.

Want to learn more about testamentary trusts? Check out our online course “Testamentary Trusts: The Essential Guide for Australian Lawyers

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CASE STUDY: YOU HAVE CHILDREN UNDER 18

A testamentary trust is a very powerful tool for families with young children.

In particular, the testamentary trust offers the following advantages:

1 Your surviving spouse might re-partner after you pass away (after a suitably long mourning period) but the inheritance you leave your family should be protected for your children in the trust away from the influence of any new partner and protected from any future family law risks.

2 If you and your spouse both pass away together, your children won’t automatically get their hands on their inheritance when they turn 18 (which could be the case if you don’t use a testamentary trust). You can choose who is responsible for making financial decisions about the inheritance until the children reach financial maturity. How many people have you heard of who came into their inheritance far too early and wasted the lot?

The tax treatment could make a huge difference to your family’s financial wellbeing.

For example: If you die leaving a spouse and 3 minor children, then roughly the first $66,000 of income earned from investing the inheritance through the testamentary trust could be tax-free and used to pay for the children’s living and education expenses.

If you didn’t have a testamentary trust, then your surviving spouse would need to pay tax on that income at their marginal tax rate (in addition to any other income, for instance, their salary) and then pay for those living and education expenses with after tax income. These tax savings continue generation upon generation so that your children can ultimately then apply tax-free amounts to their children.

Imagine paying for school fees with tax-free income; what a difference that could make!

Curious about how and when children will access control of their inheritance with a testamentary trust? Check out our blog post “Trusting the Testamentary Trust Trustees

Check the blog now

CASE STUDY: YOU HAVE CHILDREN OVER 18

If you have adult children, you should consider leaving an inheritance to them through a testamentary trust, rather than as a direct gift.

If you choose, your child can still control “their” testamentary trust (so it looks and feels like their money), but using the testamentary trust will give them the following advantages:

1 The inheritance you leave your child is significantly less likely to be exposed to any family law risks if your child separates or divorces.

2 If your child is in a high-risk occupation (e.g. carrying on a business, a director, or at risk of negligence - hello engineers, lawyers, doctors, accountants, health professionals, etc!) then the inheritance you leave your child could be exposed to those risks if you do not use a testamentary trust. A testamentary trust protects the inheritance from any bankruptcy claims.

3 The tax treatment could amplify the impact of the inheritance, because they can access tax-free income to pay for their children’s (i.e. your grandchildren’s) living and education expenses.

For example: If you leave an inheritance to your child who has 3 minor children of their own, then roughly the first $66,000 of income earned from investing the inheritance through the testamentary trust could be tax free and used to pay for your grandchildren’s living and education expenses.

If you didn’t have a testamentary trust, then your child would need to pay tax on that income at their marginal tax rate (in addition to any other income they may earn from other sources) and then pay for those living and education expenses with after tax income. These tax savings continue generation upon generation so that your grandchildren can ultimately then apply tax-free amounts to their children and so on.

There are a few more complexities but in essence, these are the main principles of Testamentary trusts.

Would a Testamentary Trust be useful?

CONSIDER TESTAMENTARY TRUSTS IF:

There will be investable assets of at least $500,000 (including super and life insurance) after administration of the estate

There are minors who can receive approximately $22,000 tax-free income each year from investing the inheritance

It is important to protect the inheritance from relationship or bankruptcy risks

A beneficiary cannot be trusted to manage their inheritance appropriately

Want More?

Are you a lawyer who wants to start offering testamentary trusts to your clients? Register for our free webinar How to deliver Testamentary Trusts with Confidence

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