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Section 79A Family Law Act
20 Aug 2025

What is Section 79A of the Family Law Act? Your Guide to Challenging an Order

By Family Lawyers Mackay, 20 Aug 2025
Family Law

Finality. It’s a word that brings a sense of closure, especially after the difficult and often emotionally draining process of a divorce or separation. When the Family Court hands down a final property settlement order, it’s meant to give both parties a clean break and the certainty to move on with their lives.

But what happens when something fundamentally wrong comes to light after the ink is dry? What if you discover that your former partner hid a substantial investment, or you were coerced into an agreement that wasn’t fair?

The law, while valuing finality, is not blind to injustice. This is where Section 79A of the Family Law Act comes in.

This provision serves as a vital safety valve, giving the Family Court the power to set aside or vary an existing property order under specific and limited circumstances. It’s not about having second thoughts or regretting a deal; it’s about correcting a serious miscarriage of justice.

At Family Lawyers Mackay, our Accredited Specialist Family  Lawyer, Ian Field, and our dedicated team understand the profound impact an unjust settlement can have on your future. We can help you understand whether you have a genuine claim under Section 79A Family Law Act and guide you through the complex process of seeking a legal remedy.

What Is Section 79A of the Family Law Act?

What Is Section 79A of the Family Law ActSection 79A of the Family Law Act 1975 (Cth) empowers the Family Court of Australia to reconsider final property settlement orders in situations where doing so is necessary to uphold justice. It’s a recognition that while the legal system prioritises closure, fairness must not be sacrificed in the name of certainty.

This provision applies to orders made under Section 79 (for married couples) and its equivalent for de facto relationships, Section 90SN.

While most property settlements are final, Section 79A Family Law Act provides a pathway to address exceptional situations where a fundamental flaw compromised the original outcome. This can include orders finalised by consent (consent orders) or those made by a judge after a contested hearing.

Section 79A Is Not an Appeal

This is a crucial distinction. Many people confuse an application under Section 79A of the Family Law Act with an appeal, but they are very different legal avenues.

  • An Appeal challenges the legal correctness of a judge’s decision. It requires proving that the judge made an error of law, fact, or discretion. Appeals must be lodged within a strict timeframe, typically 28 days from the date the order was made.
  • A Section 79A Application is about the circumstances that led to the order. It doesn’t require proving a judicial error. Instead, it focuses on issues like fraud, duress, or a fundamental mistake that happened outside of the courtroom but tainted the entire process. There is no strict time limit for a Section 79A Family Law Act application, though the court expects parties to act without undue delay.

The integrity of the judicial process hinges on parties acting with honesty and integrity. Section 79A is the law’s way of ensuring that deception or coercion cannot go unpunished, reinforcing public confidence in the family law system.

The Legal Grounds for a Section 79A Application

Under Section 79A(1), a court may vary or set aside a property order on a number of specific grounds. An applicant must be able to prove that one or more of these grounds have been met on the balance of probabilities.

1. Fraud or Suppression of Evidence

This is one of the most common grounds and arises when one party knowingly withholds or falsifies important financial information. The court’s property division process is built on a foundation of full and frank disclosure. When that foundation is compromised, the resulting order is unjust.

Examples include concealing:

  • Hidden bank accounts or investments.
  • Property assets held in third-party names.
  • Undisclosed business income or superannuation funds.

As seen in the case of Morrison & Morrison (1995) FLC 92-573, a failure to disclose the true value of an asset (in that case, an abalone fishing licence) was so significant that it was deemed a miscarriage of justice. The court held that this failure robbed the other party of the opportunity to properly litigate the true value of the asset.

2. Duress or Undue Influence

Duress involves coercion or overpowering influence that leaves a person feeling they have no real choice but to agree to a settlement. This can include threats of physical harm, financial blackmail, or emotional manipulation.

Undue influence, as highlighted by the High Court in the landmark case of Thorne v Kennedy (2017) FLC 93-807, occurs when one party is deprived of their “free agency,” leading them to sign an agreement against their better judgment. Factors like a severe imbalance of power, lack of legal advice, or a settlement that is grossly unfair can all contribute to a finding of undue influence.

3. Mistake (Fact or Law)

If an order was made based on a material error, it may be set aside. This could be a mistake of fact, such as an incorrect valuation of an asset, or a mistake of law, such as a misunderstanding of how a superannuation split works. This ground is not about a party’s poor negotiation but about a genuine, significant error that would have changed the outcome.

4. Lack of Procedural Fairness

This ground is about ensuring that the legal process itself was fair. If a party was denied a reasonable opportunity to present their case, receive key documents, or if they had language barriers without adequate support, the resulting order may be set aside.

5. Default by a Party

Section 79A(1)(c) allows for an order to be varied or set aside if one party defaults on a significant obligation imposed by the order, and it would be just and equitable to do so. For example, if a party was ordered to pay a lump sum but refused, causing significant hardship or a change in circumstances (e.g., the value of a property they were meant to transfer increased dramatically).

6. Hardship of an Exceptional Nature Relating to a Child

This ground, under Section 79A(1)(d), is used with caution. It applies when exceptional circumstances arise after the order is made, relating to the care or welfare of a child, and the child or the parent with caring responsibility for the child will suffer hardship if the order is not varied. An example could be a child developing a serious illness requiring significant, unexpected financial support.

The Three-Part Process: Proving a Miscarriage of Justice

Successfully applying under Section 79A Family Law Act involves a three-part enquiry, as established in case law such as Suiker & Suiker (1993) FLC 92-436:

  1. Establish the Facts: The applicant must provide evidence to prove that a ground (like fraud, duress, etc.) occurred.
  2. Prove a Miscarriage of Justice: The applicant must then show that this factual circumstance led to a “miscarriage of justice.” The court has defined this as an outcome that was “unjustly obtained” or a settlement that was “so far outside the ambit of what is just and equitable” that a party must have acted under duress, ignorance, or incompetence.
  3. Court’s Discretion: Even if a miscarriage of justice is proven, the court still has the discretion to decide whether to vary the order, set it aside entirely, or leave it intact. The court will balance the injustice suffered against the need for finality in legal matters.

Navigating the Application Process and Potential Outcomes

The process of challenging a final property settlement order begins by filing an application in the Family Court, supported by detailed affidavits and evidence that justify the request to reopen the matter.

  • Case Management: The court will schedule a case management hearing to define the issues, set a timeline for evidence, and determine if expert reports (e.g., forensic accounting) are needed.
  • Disclosure and Evidence: This is often the most critical part of a Section 79A Family Law Act application, as you must gather evidence to support your claims. This can include bank statements, text messages, or expert psychological reports.
  • Outcomes: After assessing the evidence, the court will either:
    • Vary the Existing Order: If the injustice affects only part of the original order (e.g., a previously undisclosed asset is discovered), the court may simply adjust the order to reflect a fairer distribution.
    • Set Aside the Original Order: If the entire settlement is fundamentally compromised, the court may set the order aside and order a full rehearing of the property division.

Risks and Considerations

Before pursuing a Section 79A Family Law Act application, it’s essential to be aware of the risks involved.

  • High Legal Costs: These applications are complex and can be expensive. If the application is unsuccessful or deemed to lack merit, you may be ordered to pay the other party’s legal costs, which can be tens of thousands of dollars.
  • Burden of Proof: The responsibility to prove the grounds for the application lies entirely with you. Speculation or mere dissatisfaction is not enough; you must provide clear, persuasive, and often independently verifiable evidence.
  • Parenting Matters: It’s important to remember that Section 79A applies only to property settlement orders. It does not affect parenting orders or arrangements.

A Local Solution for Your Family Law Matters

When faced with a complex legal challenge like a potential Section 79A Family Law Act claim, it is crucial to have expert guidance from a trusted family lawyer.

Meet Our Legal Practice Director, Ian Field

IAN FIELDAt Family Lawyers Mackay, our team is headed by our Legal Practice Director, Ian Field. A highly experienced and Accredited Specialist Family Lawyer in Mackay and Brisbane, Ian brings a wealth of knowledge to the table.

Ian commenced his legal career in the UK, where he worked in the Family Law department of one of the largest firms in Surrey. He was admitted as a solicitor of the Supreme Court of Queensland and also of the High Court of Australia in 2007.

Ian’s legal journey began with a degree in Sociology from the University of Warwick, which instilled in him a deep understanding of people and social structures. He then completed his law degree and Legal Practice Course while managing a young family and a career in the charity sector. This unique background allows him to take a sympathetic and practical approach to family law matters, helping you find solutions that are both legally sound and tailored to your personal circumstances.

Outside of work, Ian is a devoted family man with a keen interest in football (soccer). He is inexplicably obsessed with the sport, staying up in the middle of the night to watch his beloved Arsenal play in the English Premier League. This passion, combined with his love for running, cycling, and a recent attempt at golf, shows a well-rounded individual who understands the balance of life.

Why Choose Family Lawyers Mackay?

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At Family Lawyers Mackay, we only practise family law. We are a boutique, locally-run firm dedicated to providing straightforward, down-to-earth advice. You will get the personalised, friendly service that only our specialist law firm in Mackay can offer.

Our clients come from all walks of life and all over the Greater Mackay region, including Proserpine, Andergrove, Beaconsfield, Blacks Beach, Bucasia, Cremorne, Dolphin Heads, Eimeo, Erakala, Foulden, Glenella, Mackay Harbour, Mount Pleasant, Nindaroo, Ooralea, Paget, Racecourse, Richmond, Rural View, Shoal Point, Slade Point, and Te Kowai. We also assist clients from interstate and overseas.

If you believe you have grounds to challenge a property settlement, or if you simply need advice on a family law matter, don’t hesitate to Contact Us for Your Free 20-minute Evaluation with Family Lawyers Mackay. Call us on (07) 4847 0198.

Family Lawyers Mackay. Your local solution.

Frequently Asked Questions about Section 79A

Can I set aside a consent order?

Yes, you can apply to set aside a consent order under Section 79A Family Law Act if you can prove it was obtained improperly. Common grounds include one party hiding assets, duress to sign under pressure, or a fundamental mistake in the order. The court will apply strict scrutiny to the circumstances.

Is there a time limit for a Section 79A application?

There is no fixed time limit, but the court expects parties to act without undue delay. The longer the delay, the more difficult it becomes to convince the court that intervention is justified. You must provide a compelling explanation for the delay.

What’s the difference between a Section 79A and an appeal?

An appeal challenges a judge’s legal error and must be filed within 28 days of the order. A Section 79A application, by contrast, focuses on the fairness of the process leading to the order (e.g., fraud or non-disclosure). It does not require any judicial error.

How do I prove fraud or non-disclosure?

Evidence is crucial. You need to provide documentation or testimony that demonstrates material facts were knowingly withheld or misrepresented. This can include hidden bank statements, omitted superannuation balances, or communications proving deliberate concealment. The standard of proof is “on the balance of probabilities.”

Can I vary the order instead of setting it aside?

Yes. If only a part of the settlement is affected by injustice (for example, one asset was not disclosed), the court can vary the order rather than setting it aside entirely. This is often a more efficient and less disruptive remedy. The court will consider the extent of the injustice to decide whether to vary or set aside.

Does Section 79A apply to de facto relationships?

Yes. The provisions under Section 79A Family Law Act are mirrored for de facto relationships under Section 90SN of the Family Law Act. The grounds and principles for challenging a property settlement order are the same.

What is the court’s stance on duress or coercion?

The court will set aside an order if it finds that a party’s consent was not given voluntarily or was obtained under oppressive circumstances. Evidence might include threats, emotional manipulation, or proof of a significant power imbalance. The court’s focus is on whether the person was genuinely able to make a free and informed choice.

What are some examples of a miscarriage of justice?

A miscarriage of justice can occur when a party’s consent is based on misleading or inadequate information. This can happen when a party fails to make full and frank disclosure, or when one party signs a settlement that is so grossly unfair it suggests they were not acting freely or with proper legal advice.

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