Can a Property Settlement Be Reopened or Set Aside?

Key points

• Final property orders in an Australian family-law settlement — whether made after a contested hearing or by Consent — are intended to bring the financial dispute to an end and cannot ordinarily be reopened simply because one party regrets the outcome, the market has moved, or the settlement now appears unfavourable; a Court may vary or set aside property orders only where a recognised statutory ground is established under section 79A (married) or section 90SN (eligible de facto) of the Family Law Act 1975 (Cth), and even then the Court retains a discretion about what to do.
• The recognised grounds in section 79A and section 90SN broadly cover miscarriage of justice caused by fraud, duress, suppression of evidence, failure to disclose relevant information, the giving of false evidence or another qualifying circumstance; impracticability of carrying out the orders because of circumstances arising after they were made; default by a party making variation just and equitable; exceptional circumstances relating to the care, welfare and development of a child causing hardship; defined proceeds-of-crime situations; and variation or setting aside by consent of all parties to the original proceeding — establishing the threshold ground is necessary but not sufficient.
• The correct remedy must be identified first — appeal addresses error in the original decision and is subject to tight appeal periods, enforcement addresses non-compliance with valid orders, correction of an accidental slip addresses typographical or machinery errors without reopening the bargain, variation by consent requires a further Court application, and BFAs are governed by separate setting-aside provisions in Part VIIIA and Part VIIIAB; choosing the wrong process causes delay, cost and limitation problems.
• Materiality, causation and discretion are decisive — non-disclosure of a small bank account in a multi-million-dollar settlement may be immaterial, while a significant undisclosed company interest, cryptocurrency holding or false family-loan liability may be material; ordinary later changes in property value, market growth, business performance, refinance difficulty or regret do not, by themselves, justify reopening, and the Court will consider the seriousness of the conduct, delay, prejudice, third-party interests, completed transactions and bona fide purchasers before granting relief.
• Final outcomes are not a return to the parties' pre-orders positions — the Court may dismiss the application, vary part of the original orders, set aside part or all of them, substitute new property orders, preserve completed transactions, protect third parties, make implementation orders, stay enforcement, order further disclosure or make costs orders; tax, duty, superannuation, creditor and bankruptcy consequences must be reviewed before any substituted order is made and a second transaction does not automatically receive the same CGT roll-over or Victorian duty concession as the original.
• Engage a lawyer with combined family-law, commercial, property and litigation experience before any irreversible step — early advice identifies the correct pathway, preserves evidence, supports interim protective relief (stay, injunction, freezing order, preservation order or caveat where legally available), addresses procedural fairness to third parties, and reflects the current Federal Circuit and Family Court of Australia (Family Law) Rules and the appeal and pre-action requirements that apply to the chosen application.