De facto relationships in Australia are legally recognised partnerships between two people who live together as a couple without being married, and once certain thresholds are met they carry property, parenting, benefits, and inheritance rights broadly similar to marriage under the Family Law Act 1975. Same-sex and opposite-sex couples are treated identically. The rules shift depending on whether you are dealing with a court property claim, a Centrelink payment, or a deceased estate, and one state runs on its own separate framework.
What Makes a Relationship De Facto
Section 4AA of the Family Law Act 1975 defines a de facto relationship as two people living together as a couple on a genuine domestic basis, where they are not married to each other and not related by family.1Federal Circuit and Family Court of Australia. De Facto Relationships No single factor proves the relationship exists. A court looks at the full picture.
The indicators a court weighs include:
- How long the couple has lived together.
- Financial interdependence, such as shared bank accounts, joint bills, or pooled income.
- Property arrangements, including joint ownership or shared use of a home, car, or other assets.
- Common residence, though separate residences do not automatically disqualify a couple whose lives are otherwise integrated.
- How the couple presents themselves publicly to family, friends, and government agencies.
- The degree of mutual commitment to a shared future.
- Caring for children together as a household.
- Sharing household tasks, social activities, and leisure time.
No single item needs to be present and no single item is decisive. A couple with separate bank accounts who share a home and raise children may qualify easily. Two people with a joint mortgage who rarely live in the same city may not. The test is deliberately flexible.
When You Can Go to Court
Being in a de facto relationship does not by itself entitle you to court orders for property division or maintenance. Section 90SB of the Family Law Act 1975 sets gateway conditions.2Federal Register of Legislation. Family Law Act 1975 – Subdivision B: When This Division Applies At least one must apply:
- The couple lived together on a genuine domestic basis for at least two years in total.
- The couple has a child together.
- One partner made substantial financial or non-financial contributions, and refusing to make an order would cause serious injustice. Both elements are needed; contributions alone are not enough.
- The relationship was formally registered under a state or territory scheme.
The two-year requirement catches many people out. An 18-month relationship with no children generally cannot access the court’s property powers unless the contribution-and-injustice route is available. Registration offers a workaround.
Registering the Relationship
Every state and territory except Western Australia offers a formal registration scheme through the Registry of Births, Deaths and Marriages. Registration creates an official record and satisfies one of the Section 90SB thresholds regardless of how long you have been together.
Applications require proof of identity such as a birth certificate or passport. Both partners must be at least 18, not currently married, and not already in another registered relationship. New South Wales applies a 28-day cooling-off period before registration is finalised.3NSW Government. Relationship Register Other states set their own processing rules.
Fees vary. As a guide, Queensland charges around $165,4Queensland Government. Register a Civil Partnership New South Wales around $190,5NSW Government. Fees and Processing Times and Victoria around $259,6Births, Deaths and Marriages Victoria. Register a Domestic Relationship with certificate fees often extra. The registration certificate then serves as straightforward proof of the relationship for government agencies, banks, and legal proceedings.
Property, Superannuation, and Maintenance After Separation
When a de facto relationship ends, both partners have property rights under Part VIIIAB of the Family Law Act 1975.7Federal Register of Legislation. Family Law Act 1975 – Part VIIIAB: Financial Matters Relating to De Facto Relationships The court treats these cases almost identically to divorcing married couples. It identifies and values everything in the asset pool, assesses each person’s financial and non-financial contributions, considers future needs such as age, health, earning capacity, and responsibility for children, and then checks whether the result is just and equitable overall.
Superannuation is treated as property in a de facto settlement and can be split by court order.8Federal Register of Legislation. Family Law Act 1975 – Part VIIIB: Superannuation Interests For many couples, super is the largest or second-largest asset. Both parties must disclose all superannuation in their court forms, even funds they do not intend to split, and self-managed funds usually need an expert valuation from an accountant.9Federal Circuit and Family Court of Australia. Family Law and Superannuation If you are not sure which funds your former partner holds, you can apply through the Commonwealth Courts Portal for the court to request that information from the Tax Commissioner.
A de facto partner who cannot adequately support themselves after separation may also be entitled to ongoing maintenance from the other partner.10Federal Register of Legislation. Family Law Act 1975 – Subdivision B: Maintenance The court weighs age, health, earning capacity, and the standard of living during the relationship.
Couples can opt out of the court process by entering a binding financial agreement, sometimes called a de facto prenup. These can be made before, during, or after the relationship.11Federal Circuit and Family Court of Australia. Financial or Property: Financial Agreements Section 90UJ requires each party to receive independent legal advice from a separate Australian lawyer before signing. A properly executed agreement prevents the court from making property or maintenance orders. A court can still set one aside if it was obtained by fraud, was unconscionable, or if circumstances have changed so dramatically that enforcing it would be impractical. Getting the technical requirements wrong is the most common reason these agreements fail.
The Two-Year Deadline to File
You have two years from the date of separation to file a property settlement or maintenance application with the court. After that, you need the court’s permission to proceed, and it is not guaranteed.
Under Section 44(5), the court will grant permission to file late only if satisfied that refusing would cause hardship to you or a child of the relationship. It looks at whether you have a reasonable case, whether you have a decent explanation for the delay, and whether the hardship of allowing you to proceed is outweighed by the hardship of shutting you out. An inadequate explanation will not automatically sink your application if the hardship balance tips your way, but relying on that is a gamble.
The clock starts from the actual date of separation, not from when one partner moved out or anything was formalised. Couples who separate gradually, or who stay under the same roof for financial reasons, sometimes disagree about when that date was. A short email to your former partner confirming the separation date can save significant legal costs later.
Children and Child Support
Children of de facto relationships have exactly the same legal protections as children of married parents.
Every parenting decision must treat the child’s best interests as the paramount consideration.12Attorney-General’s Department. Children and Family Law Since May 2024, following amendments made by the Family Law Amendment Act 2023, the Family Law Act no longer contains a presumption of equal shared parental responsibility.13Federal Circuit and Family Court of Australia. Family Law Changes from 6 May 2024 Courts now weigh six core factors:
- What arrangements best protect the child and their carers from family violence, abuse, or neglect.
- The child’s views, with weight given according to their maturity.
- The child’s psychological, emotional, cultural, and developmental needs.
- Each proposed carer’s capacity to meet those needs, including willingness to seek support.
- The benefit of maintaining a relationship with both parents and other significant people, where it is safe to do so.
- Anything else relevant to the specific child.
Safety sits at the top of the list deliberately.
Child support obligations apply to all parents regardless of whether the relationship was a marriage or a de facto partnership. If parents cannot agree privately, either can apply to Services Australia for an assessment, which calculates payments based on each parent’s income and share of care.14Services Australia. Learning About Child Support Self-managing is allowed, but it means you only qualify for the base rate of Family Tax Benefit Part A. Services Australia provides online calculators to estimate likely amounts before you apply.
Centrelink Uses a Broader Test
Centrelink applies its own definition of a de facto relationship, and it is broader than the Family Law Act’s version. There is no minimum time requirement. Centrelink can classify you as a member of a couple from the moment your relationship begins, provided it considers the relationship to be similar to marriage.15Services Australia. Making Your Relationship Official
Being classified as a couple has real financial consequences. Your payments switch to the partnered rate, which is lower per person than the single rate, and your partner’s income and assets are included in your means test.16Department of Social Services. 2.2.5.30 Determining Member of a Couple Relationships If your partner earns above the income threshold, your payment may be reduced or cut entirely, even if you have no access to their money. Failing to tell Centrelink about a new relationship can create a debt the agency will recover.
Inheritance When a Partner Dies
De facto partners have inheritance rights under state and territory succession laws, though the specifics differ by jurisdiction. In general, if your partner dies without a will, you are treated similarly to a surviving spouse for the purpose of inheriting from the estate. If your partner left a will that does not adequately provide for you, most jurisdictions allow a family provision claim challenging it.
Proving the relationship existed after your partner has died can be difficult, especially if it was not registered and family members dispute its existence. Registration provides clear documentation. Without it, you may need to assemble evidence of shared finances, cohabitation, and public recognition of the relationship, the same indicators used under Section 4AA, at a time when gathering that evidence is emotionally and practically harder.
Western Australia Works Differently
Western Australia has not referred its de facto property powers to the Commonwealth. De facto couples in WA cannot use the Federal Circuit and Family Court for property division or maintenance after separation. They must apply to the Family Court of Western Australia under the Family Court Act 1997 (WA).
Part VIIIAB, superannuation splitting orders, and binding financial agreements under the federal Act do not apply to WA de facto couples. WA has its own equivalent provisions, but the processes, time limits, and legal tests can differ. Parenting matters involving children are still handled under the federal Family Law Act, even in WA. If you are in a de facto relationship in Western Australia, make sure any legal advice you receive is based on WA state law, not the federal framework that applies elsewhere.