What is a De Facto Relationship in Australia?
In Australia, s 4AA of the Family Law Act 1975 (Cth) defines a de facto relationship as when two people “have a relationship as a couple living together on a genuine domestic basis”. To meet this legal definition, you must not be legally married to each other or related by family. This standard applies equally to both same-sex and opposite-sex couples.
De facto couples hold substantially similar rights and obligations as married couples. This includes strict legal frameworks regarding separation, property division, spousal maintenance, and parenting arrangements.
Book an initial consultation today to get expert advice on your de facto status and safeguarding your wealth.
How to Prove a De Facto Relationship in Australia - s 4AA
Establishing the legal status of your partnership is a critical first step, whether you are drafting a Binding Financial Agreement or navigating a de facto separation. Disputes frequently arise when one party attempts to deny the relationship to shield their wealth, or conversely makes a baseless claim against your personal assets.
When determining whether your relationship can be classified as a de facto relationship under s 4AA, the Family Court may consider any or all of the following circumstances:
- Duration of the relationship: A de facto relationship legally exists the moment a couple live together on a domestic basis. However, the Court generally requires couples to live together for 2 years before one party can seek property division or spousal maintenance (unless there are exceptions - see De Fecto Separation below).
- Nature and extent of their common residence: The proportion of time spent under the same roof, shared living spaces, and whether you use a common address for correspondence and personal belongings.
- Whether a sexual relationship exists: Whether the relationship includes physical intimacy and a shared bedroom.
- Degree of financial dependence or interdependence: The existence of joint bank accounts, shared household expenses, and any explicit or implied arrangements for financial support.
- Ownership, use and acquisition of their property: Whether you have jointly purchased real estate, vehicles, or manage liabilities (such as a mortgage) together.
- Degree of mutual commitment to a shared life: How you present yourselves as a couple to family and friends, share meals and free time, and the division of household responsibilities.
- Whether the relationship is or was registered: Whether your relationship is formally registered under State or Territory law, such as with Services NSW.
- Care and support of children: Whether both parties share responsibility for the daily care of children, including those from previous relationships.
- Reputation and public aspects of the relationship: Your attendance at social events as a couple, joint memberships, or your public representation on social media.
No single factor above is completely decisive on its own and the legal definition of a de facto partnership continues to evolve. Under 2025 reforms, couples who live in separate homes can still be deemed a de facto couple if there is high financial interdependence and a clear public reputation.
Evidence and Proof of a De Facto Relationship in Australia
You and your legal team will need to present evidence to the Family Court to prove that a de facto relationship does or does not exist. This evidence can include:
- Bank statements: Either joint statements or individual statements demonstrating financial intermingling.
- Joint bills or loans: For rent, mortgage, vehicles, appliances or other assets.
- Joint lease agreements or property titles
- Superannuation beneficiary nominations or mutual wills
- Relationship registration certificates
- Official correspondence: Government letters, business letters, joint invitations and event tickets addressed to both parties jointly.
- Statutory declarations: From family, friends, colleagues and neighbours proving public reputation as a couple.
- Social media posts: Photos of you together as a couple (preferably in public with family and friends) at different occasions.
- Couple communications: Phone records or loving messages via social media apps, text or email.
- Written statements: Detailing how you share daily routines and split responsibilities.
Our Accredited Family Law Specialists know exactly how to compile the critical evidence needed to prove or disprove that you are in a de facto relationship.









