Blended family inheritance is becoming one of the quiet pressure points in Australian property wealth.
The family home is usually treated as the safest asset in the plan. It is familiar. It is visible. It is often the biggest store of wealth a household has.
But in a blended family, the same home can become the asset that turns one generation’s planning into the next generation’s dispute.
Now the federal government’s planned 30 per cent minimum tax on discretionary trusts adds another layer of complexity. The tax is due to start from 1 July 2028, with trustees paying the minimum tax and most non-corporate beneficiaries receiving non-refundable credits for tax paid by the trustee. The Budget papers also say some exclusions will apply, including deceased estates and income from assets of testamentary trusts existing at announcement.
That detail matters because estate plans are built on assumptions. When tax rules move, family promises can become harder to deliver.
Why the family home is the flashpoint
In many households, the family home passes to the surviving spouse.
That can be reasonable. Courts and families generally recognise that a surviving partner needs somewhere to live. The problem is what happens after that.
In a first marriage with shared children, the pathway is usually simpler. One spouse dies. The surviving spouse keeps the home. When the survivor dies, the children inherit.
In a blended family, the pathway can break.
A surviving spouse may later change their will. They may leave assets to their own biological children, a new partner, or someone else. The children of the first spouse may assume they will inherit later, only to discover there was no binding mechanism to make that happen.
That is the sideways inheritance trap.
In plain English: wealth moves sideways to the surviving partner, then down a different bloodline.
This is not a fringe issue. The Australian Institute of Family Studies says that, at the 2021 Census, 12 per cent of couple families with dependent children were either stepfamilies or blended families, including 182,229 stepfamilies and 99,564 blended families.
That figure does not capture every older blended family where the children are now adults. For property owners, that is where the money often is.
The tax change that complicates the fallback plan
A common estate-planning tool is the testamentary trust.
A testamentary trust is a trust created by a will after someone dies. It can help manage how assets are controlled, protected and distributed.
For blended families, the attraction is obvious. A will-maker may want the surviving spouse to receive income or use of an asset, while preserving the capital for biological children later.
But the Budget trust-tax change means families cannot assume the old tax maths will keep working.
The government says the 30 per cent minimum tax will apply to discretionary trusts from 1 July 2028. Trustees will pay the tax, and beneficiaries will generally still include trust income in their own tax returns, with non-refundable credits for tax paid by the trustee.
The Budget explainer also says the government will consult on key design details, including collection mechanics and restructuring relief. That means some estate plans may need to be reviewed before the final shape is settled, not after a death has occurred.
Australian Property Review has already covered why the broader trust-tax package could hit property owners in unexpected ways, especially where structures that once looked efficient become expensive after the rules change
Quick take
The problem is not just tax. It is control.
A family home can pass cleanly to a surviving spouse and still fail the original parent’s intention.
A testamentary trust can help, but the proposed 30 per cent trust tax means families need to pressure-test the structure, not treat it as a default fix.
The practical question is simple: who controls the asset, who benefits from it, and what happens after the survivor dies?
What changed and what did not
What changed is the tax backdrop.
From 1 July 2028, discretionary trusts in scope will face a 30 per cent minimum tax at trustee level. The measure is aimed at income splitting and fairness, according to the Budget papers.
What did not change is the basic inheritance risk.
If assets are left outright to a surviving spouse, that spouse may have significant freedom over what happens next. A will can express an intention, but intention is not always protection.
That is why blended family estate planning usually needs more than a simple “everything to my spouse, then to the kids” structure.
For readers who have not reviewed the superannuation side of their estate plan, this matters even more. Australian Property Review has previously explained why your will may not control your super and why adult children can face a tax hit if nominations are wrong
The planning tools families usually consider
There is no single perfect structure. Each option creates trade-offs between fairness, flexibility, tax, control and family peace.
A mutual will agreement can bind spouses to an agreed distribution plan. The point is to stop the survivor from later changing course in a way that defeats the original agreement.
A life interest can let the surviving spouse live in the home or receive income from an asset during their lifetime, while preserving the capital for children later.
A testamentary trust can create a structure inside the will to manage income, control and eventual distribution.
The catch is that each tool only works if it is drafted properly and matches the asset mix. Property, super, trusts, companies and personal assets can all follow different legal pathways.
That is the part many families miss.
A will that looks tidy on paper can still leave gaps if the house is owned jointly, the super nomination is out of date, or the trust deed gives control to the wrong person.
The second-order effect for property owners
This is a property story because the home often carries the emotional and financial weight.
Higher house prices mean inheritance disputes are more worth fighting. A Sydney or Melbourne home bought decades ago may now represent most of a family’s wealth. Add super, investment properties or a family trust, and the estate can become large enough for legal action to feel rational, even if it damages relationships.
The second-order effect is timing.
Children from a first relationship may wait years, or decades, for a surviving stepparent to die before they know whether they will receive anything. If the stepparent is much younger than their late parent, that waiting period can stretch even further.
That creates inheritance anxiety.
It can also distort financial decisions. Adult children may delay buying, investing or helping their own children because they are unsure whether an expected inheritance is real or imagined.
What could derail the plan
The biggest risk is assuming goodwill will do the work of legal structure.
Good relationships matter. They are not enough.
Other risks include:
- The home passing outside the will because of ownership structure.
- Superannuation nominations being outdated, invalid or inconsistent with the will.
- A surviving spouse changing their will after death.
- Trust tax changes reducing the benefit of a planned testamentary trust.
- Family members interpreting “fair” in completely different ways.
Australian Property Review has also covered the broader Budget uncertainty around trusts and property investors
The practical take
If you are in a blended family and most of your wealth is tied up in property, do not start with the tax rate.
Start with the control map.
Write down:
- Who owns the home now?
- What happens to it on the first death?
- Who can change the plan after that?
- Where does super go?
- Are trusts, companies or investment properties involved?
- Does the plan protect the survivor without cutting out biological children?
- Has the plan been reviewed since the 2026 Budget trust-tax announcement?
Then take that map to an estate-planning solicitor and tax adviser.
The rule of thumb is simple: if the plan relies on someone “doing the right thing later”, it is not really a plan.
Start here: review ownership, wills, super nominations and trust structures before the 2028 rules arrive.
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General info, not financial advice.
