Strategic Estate Planning: Maximising Protection and Tax Efficiency with Testamentary Discretionary Trusts

Estate planning is about far more than deciding who receives your assets. For many families, the real challenge lies in protecting wealth, minimising tax, and ensuring future generations are supported in a way that reflects changing family circumstances. One of the most effective tools available to achieve these goals is a Testamentary Discretionary Trust (TDT).

Positioned at the intersection of estate law and taxation, a TDT can provide significant benefits for families seeking flexibility, asset protection, and long-term tax efficiency.

What Is a Testamentary Discretionary Trust?

A Testamentary Discretionary Trust is a trust established under a Will that generally comes into effect upon a person's death. The trust is funded by estate assets and operates according to the terms set out in the Will.

Unlike a direct inheritance, where assets pass immediately into a beneficiary's personal ownership, a TDT allows an appointed trustee to manage and distribute income and capital among a defined group of beneficiaries. This flexibility makes TDTs particularly valuable for:

• Families with young children
• Blended families
• Business owners
• Beneficiaries in high-risk professions
• Vulnerable individuals who may require additional financial protection

By giving trustees discretion over distributions, a TDT can adapt to changing family needs and circumstances over time.

Asset Protection and Risk Management

One of the key advantages of a Testamentary Discretionary Trust is its ability to provide a layer of asset protection.

For beneficiaries who own businesses, work in litigation-prone professions, or face increased financial risk, holding inherited assets within a trust rather than in their personal name can help reduce exposure to creditors, insolvency, and business liabilities.

However, it is important to recognise that no trust structure provides absolute protection. The effectiveness of asset protection measures can be diminished where the beneficiary exercises significant control over the trust. Additionally, in family law matters, courts may examine trust arrangements, control structures, trust assets, and historical transactions when determining financial resources following a relationship breakdown.

As a result, careful drafting and governance remain critical components of any trust strategy.

Significant Tax Advantages Through Income Splitting

A major financial benefit of a TDT is its ability to facilitate income splitting among family members.

Trustees can allocate trust income to beneficiaries in a way that helps optimise the family's overall tax position. This can be particularly advantageous where beneficiaries are in different tax brackets.

Importantly, under specific provisions of the Income Tax Assessment Act 1936 (Division 6AA and section 102AG), qualifying income distributed from inherited estate assets through a testamentary trust may receive favourable tax treatment when paid to beneficiaries under 18 years of age.

As a result, a minor beneficiary may receive up to the tax-free threshold of $18,200 per year of qualifying testamentary trust income without paying income tax, provided certain legislative requirements are met and the beneficiary is an Australian tax resident for the full income year. The income should also be applied towards the child's maintenance, education, or advancement.

For families with multiple children, these tax outcomes can create substantial long-term savings.

Flexibility for Modern Family Structures

Today's families are often more complex than traditional estate planning models anticipated.

A well-drafted Will can establish a separate Testamentary Discretionary Trust for each primary beneficiary. This approach allows each family branch to:

• Hold assets independently
• Maintain separate accounting records
• Make individual investment decisions
• Manage distributions according to their own family circumstances

This structure can be particularly effective for blended families, where maintaining clear separation between family branches may help reduce future disputes and preserve family harmony.

Many TDT arrangements can also be drafted as optional structures. This gives beneficiaries the flexibility to choose between receiving assets outright or retaining them within a trust environment, without impacting the arrangements available to other beneficiaries.

Understanding the Compliance Requirements

While the benefits of a TDT can be significant, they must be weighed against the administrative obligations involved.

Trustees are responsible for ongoing compliance, including:

• Maintaining separate trust bank accounts
• Keeping accurate financial records
• Making formal income distribution resolutions before 30 June each year
• Lodging annual trust tax returns
• Tracking the source of trust assets and income

Particular attention must be given to record-keeping. Income generated from assets that originated from the deceased estate may receive different tax treatment from income generated by assets or funds introduced into the trust at a later date. Maintaining a clear audit trail is therefore essential.

The key question for many families is whether the anticipated asset protection and tax benefits justify the ongoing compliance obligations throughout the trust's lifetime.

Legislative Developments: The 2026–27 Federal Budget

Recent legislative proposals have further increased interest in Testamentary Discretionary Trusts.

As part of the 2026–27 Federal Budget, the Federal Government announced a proposed 30% minimum tax on discretionary trusts, intended to commence on 1 July 2028.

Following consultation, the Government proposed that genuine testamentary trusts be excluded from the operation of this minimum tax. Although these measures had not become law as at October 2026, the proposed exemption highlights the continuing recognition of testamentary trusts as an important estate planning vehicle.

Should the proposals proceed, maintaining detailed records linking trust income directly to inherited estate assets will become increasingly important. In addition, for testamentary trusts established on or after 1 July 2028, the proposed exemption is expected to require eligible beneficiaries to be limited to individuals and income-tax-exempt entities.

These developments reinforce the value of early planning and proactive review of existing estate structures.

Planning Ahead: The Importance of Professional Advice

The effectiveness of a Testamentary Discretionary Trust depends heavily on planning undertaken during life, not after death.

Careful consideration should be given to:

• Trustee and successor trustee appointments
• Trust control mechanisms
• Potential family disputes
• Asset ownership structures
• Superannuation death benefit nominations
• Tax planning objectives

When properly implemented, a TDT can provide a powerful combination of asset protection, tax efficiency, and family flexibility that may benefit multiple generations.

Testamentary Discretionary Trusts remain one of the most versatile and strategic estate planning tools available to Australian families. Whether the objective is protecting assets from future risks, managing wealth for children, supporting vulnerable beneficiaries, or improving tax outcomes, a carefully structured TDT can deliver significant long-term advantages.

Given the complexity of trust law, taxation rules, and proposed legislative changes, a comprehensive review of your Will, family circumstances, and asset structures is essential. With the right planning in place, your estate can be positioned to protect wealth, preserve family harmony, and maximise tax efficiency for generations to come.

Need Estate Planning Advice?

Every family situation is different, and the suitability of a Testamentary Discretionary Trust will depend on your personal circumstances, asset structure, and long-term objectives. Obtaining tailored legal and taxation advice is essential to ensure your estate plan delivers the protection, flexibility, and tax outcomes you intend.

If you would like to discuss whether a Testamentary Discretionary Trust is right for you, or review your existing Will and estate planning arrangements, contact the team at RNG Lawyers. Our experienced estate planning lawyers can help you design a strategy that protects your assets, supports your beneficiaries, and aligns with your family's future needs.