Separation and De Facto Relationships : Koffels Solicitors and Barristers

What Australian family law provides when a relationship ends — for married and de facto couples alike

Separation is the point at which Australian family law becomes directly relevant to most people’s lives. Whether a couple is married or in a de facto relationship, the law provides a framework for resolving the financial and parenting consequences of a breakdown — but the rights that arise, the timelines that apply, and the complexity of the process vary considerably depending on the nature of the relationship and the assets involved.

This hub page covers the legal definition of separation and de facto relationships under Australian law, what rights arise on separation for both married and de facto couples, the key differences between the two, and when the financial complexity of a separation warrants specialist advice beyond what a general overview can provide.

Part of the Koffels complex family law guide. For detailed guidance on property settlement, Binding Financial Agreements, and other specific topics, use the links throughout this page.

What separation means in Australian law

Separation occurs when one or both parties decide the relationship is over and act on that decision. Unlike divorce, separation does not require a court order or any formal legal process. It is a factual state — the point at which the parties have ceased to live together as a couple — and it is the date from which most family law time limits and rights are calculated.

Separation can occur while parties are still living under the same roof, provided it can be demonstrated that the domestic relationship has genuinely ended. This is sometimes referred to as “separation under one roof” and requires evidence that the parties have changed their domestic arrangements — separate finances, separate social lives, separate sleeping arrangements — in a way that is consistent with the relationship having ended.

For married couples, separation is a prerequisite to divorce. Under the Family Law Act 1975 (Cth), a divorce order can only be made where the parties have been separated for at least twelve months. The divorce itself is the legal dissolution of the marriage — it is a procedural step, not the substantive financial or parenting resolution, which is handled separately through property settlement and parenting orders.

For de facto couples, there is no equivalent of divorce. The relationship ends on separation, and the legal consequences flow directly from that date.

What is a de facto relationship?

Under the Family Law Act, a de facto relationship exists where two people who are not married to each other and not related by family live together on a genuine domestic basis. The definition applies regardless of gender and regardless of whether the parties regard themselves as being in a committed relationship.

Courts assess de facto status by looking at the totality of the relationship rather than any single factor. The relevant considerations include the duration of the relationship, the nature and extent of the common residence, the degree of financial dependence or interdependence, the ownership, use, and acquisition of property, the degree of mutual commitment to a shared life, the care and support of children, and the reputation and public aspects of the relationship.

No single factor is determinative. A relationship of less than two years can qualify as de facto if children are involved or if one party made substantial contributions. Parties who maintain separate residences can be in a de facto relationship if the other indicators of a shared domestic life are present. The two-year duration is a threshold for property rights, not for the existence of the relationship itself.

The practical consequence is that people can find themselves in a legally recognised de facto relationship without having made a conscious decision to enter one. This is particularly relevant for business owners, executives, and individuals with significant assets who may not have considered the financial implications of a long-term domestic arrangement that has not been formalised or documented.

Further reading: How de facto relationships arise — and the legal implications →

Rights on separation — married and de facto compared

The Family Law Act treats married and de facto couples consistently for most purposes, but there are important differences in the threshold requirements, time limits, and in some cases the jurisdictional basis for claims.

Property settlement

Both married and de facto couples have the right to apply for a property settlement under the Family Law Act. The four-step framework courts apply — identifying and valuing the asset pool, assessing contributions, considering future needs, and assessing whether the outcome is just and equitable — is the same for both.

The key difference is that de facto couples must establish that their relationship qualifies under the Act before the court can make property orders. Where the existence or duration of the de facto relationship is disputed, that threshold question may itself need to be determined before the substance of the property claim can be addressed.

Time limits differ materially. Married couples must apply for property settlement within twelve months of a divorce order being made. De facto couples must apply within two years of separation. Missing these time limits does not automatically extinguish the right to apply, but leave of the court is required to proceed out of time, and obtaining that leave is not straightforward.

Spousal and de facto maintenance

Both married and de facto parties may be entitled to maintenance from the other where they are unable to adequately support themselves and the other party has the capacity to pay. The threshold for maintenance is the same across both categories — the applicant must demonstrate a genuine inability to meet their reasonable needs from their own income and assets.

Maintenance is most commonly relevant where there is significant income disparity, where one party has left the workforce to care for children, or where one party has health issues that affect their earning capacity. In relationships involving high incomes on one side and minimal independent income on the other, maintenance can be a significant ongoing obligation.

The same time limits apply as for property settlement — twelve months post-divorce for married couples, two years post-separation for de facto couples.

Parenting

Parenting rights and obligations are determined by reference to the best interests of the child, not the legal status of the parents’ relationship. Married and de facto parents have identical standing in parenting proceedings. The framework for parenting orders, the best interests considerations, and the procedural requirements are the same regardless of whether the parents were married or de facto.

Further reading: De facto versus married: rights in a separation in NSW →

Proving a de facto relationship

Where the existence of a de facto relationship is disputed — most commonly where one party asserts de facto rights and the other denies the relationship qualified — the court must determine the question on the evidence.

Evidence relevant to establishing a de facto relationship includes financial records showing joint accounts or shared expenses, property records showing co-ownership or shared occupancy, evidence of shared domestic arrangements, communications between the parties evidencing the nature of the relationship, and evidence from third parties including family members, friends, and colleagues about how the relationship was presented publicly.

Disputing a de facto claim requires more than simply asserting that the relationship was casual. Courts examine the substance of the parties’ domestic arrangements, not the labels either party applies to the relationship. Where the financial and domestic indicators of a de facto relationship are present, a party who maintained that the relationship was not serious may find that position difficult to sustain.

When separation becomes complex

For most couples, the financial consequences of separation involve a family home, superannuation, and relatively straightforward assets. The legal framework handles those situations efficiently and at a reasonable cost.

Separation becomes materially more complex when the asset pool includes any of the following:

Private business interests — where one or both parties hold interests in a private company, partnership, or professional practice, valuation and the treatment of goodwill become significant issues.
Discretionary trust structures — assets held in family trusts raise questions about whether those assets are property available for division or financial resources that indirectly influence the outcome.
Pre-relationship wealth — significant assets brought into the relationship — requires analysis of how contributions have been assessed and what, if any, protection applies to that pre-existing wealth.
Overseas assets — property, investments, or business interests held in foreign jurisdictions introduce questions of disclosure, valuation, and enforcement that require coordinated legal advice.
Superannuation in self-managed funds — where the SMSF holds illiquid or complex assets — requires careful coordination between the family lawyer and the fund’s accountant and auditor when splitting.
Inherited wealth — inheritances received before or during the relationship are contributions that courts consider, but their treatment depends on the timing, the degree to which they have become commingled with relationship assets, and the length of the relationship.

In each of these situations, the standard analysis that a general family law practice applies may be insufficient. The financial structures involved require legal advice that combines family law expertise with genuine commercial and tax understanding.

Further reading: Property settlement and business interests — the Koffels hub page →

De facto relationships and business owners

For business owners, founders, and executives, the de facto provisions of the Family Law Act create a specific risk that is frequently underestimated. A long-term domestic arrangement that has not been formalised as a marriage and has not been the subject of a Binding Financial Agreement can expose significant business interests to a property settlement claim that the business owner had not anticipated.

The risk is compounded by the fact that the existence of a de facto relationship can be contested, but not always successfully. Where the relationship has the indicators courts look for — duration, shared domestic arrangements, financial interdependence — a party who argues they were not in a de facto relationship because they did not regard it as a serious commitment may find that argument fails in light of the evidence of how the relationship actually operated.

The most reliable protection for a business owner in a significant domestic relationship — married or de facto — is a Binding Financial Agreement that addresses how business interests will be treated upon separation. A BFA made before or during a de facto relationship has the same legal effect as one made in the context of a marriage, and the same strict requirements for enforceability apply.

Further reading: Binding Financial Agreements — the Koffels hub page →

Unregistered and undocumented relationships

Many de facto relationships are never formally registered or documented. In NSW, relationship registration is available under the Relationships Register Act 2010, which allows couples to register their relationship as a formal legal status. A registered relationship gives rise to the same rights as a de facto relationship without the need to prove the relationship exists — registration is conclusive evidence of it.

For most couples, registration is not something they have considered. The legal rights that arise in an unregistered de facto relationship are the same as those in a registered one — the difference is evidentiary. A party in an unregistered relationship seeking to establish their de facto status must prove it using the factors outlined above. A party in a registered relationship does not.

From a planning perspective, an unregistered de facto relationship that has not been the subject of a BFA leaves both parties exposed to the uncertainty of a contested de facto claim if the relationship breaks down. That uncertainty is itself a risk of protracted litigation over threshold questions before the substance of the property claim can even be addressed.

What to do when a relationship breaks down

The period immediately following separation is one where decisions made quickly and informally can have long-term legal consequences. Several principles apply regardless of whether the relationship is a marriage or a de facto partnership.

The duty of financial disclosure applies from the moment family law proceedings are reasonably contemplated. Asset movements, trust distributions, changes to business structures, and transfers of property made after separation can be scrutinised and, in some cases, reversed. Taking significant financial steps without legal advice before separation — or immediately after — creates risk that is often avoidable.

Informal agreements reached between parties without legal advice are not binding under the Family Law Act. An agreement reached over the kitchen table, or even a written document signed by both parties without independent legal advice, does not have the legal effect of a court order or a properly executed binding financial agreement. Parties who rely on informal agreements often find them unenforceable, sometimes years later.

Time limits are not flexible. Missing the 12-month or 2-year deadline for property claims requires an application for leave to proceed out of time, which is not routinely granted and involves additional costs and uncertainty. Awareness of the relevant deadline from the date of separation is important.

Speak with us in confidence

If your relationship has broken down and you are uncertain about your rights, or if you are in a significant domestic relationship and want to understand your exposure, we invite you to contact us for a confidential discussion. There is no obligation.

This page is intended as a general reference only and does not constitute legal advice. Family law outcomes are highly fact-specific. You should seek advice from a qualified family law solicitor in relation to your particular circumstances. Koffels Solicitors and Barristers, Level 23 Angel Place, 123 Pitt Street, Sydney NSW 2000.