Section 4AA of the Family Law Act sets out specific requirements that determine whether a relationship is legally recognised as “de facto.” Getting these requirements right from the start makes the entire process smoother and protects your interests in property settlements.
At Jameson Law, we’ve seen how confusion around Section 4AA compliance creates unnecessary delays. This guide walks you through the 9 statutory factors and the evidence you need.
What Section 4AA Actually Requires?
The Core Definition and Its Complexity
Section 4AA of the Family Law Act 1975 defines a de facto relationship as two people who are not married, not related by family, and who live together on a genuine domestic basis. The Federal Circuit and Family Court of Australia (FCFCOA) does not apply a simple checklist. Instead, courts weigh nine distinct factors.
The Nine Factors Courts Examine
Courts examine the duration of the relationship, common residence, sexual relationship, financial dependence, ownership of property, and the care of children. The High Court confirmed in Fairbairn v Radecki (2022) that living in the same house is not strictly mandatory if other factors demonstrate a shared life.

What Evidence Actually Proves De Facto Status?
Evidence from Berrell & Tily (No 3) (2023) shows that shared financial arrangements alone do not prove a de facto relationship. Bank statements showing separate lodging can undermine cohabitation claims. You must present corroborating documentation to satisfy the court.
The Two-Year Rule and Its Exceptions
A two-year cohabitation period is a common indicator. However, you can establish de facto status earlier if you have a child (see parenting orders) or if you registered the relationship with NSW Births Deaths & Marriages.
Building Your Evidence and Getting Professional Support
Gather Evidence Across Multiple Domains
Collecting the right evidence determines success. Start by gathering documents that span multiple areas: joint bank accounts, lease agreements, and medical records. Photographs and social media posts provide public evidence of your reputation as a couple.

Why Financial Records Alone Fall Short
A critical mistake is treating financial records as sufficient proof. You need evidence across at least four distinct areas: residence, finances, property, and public reputation. Our family lawyers in Sydney can help you audit your evidence.
Work With a Family Law Specialist
A family law specialist identifies gaps before filing. The two-year deadline to bring a claim (Section 44 of the Act) is absolute. Missing this window requires court permission, which is difficult to obtain.
Understand Timeline and Procedural Expectations
Uncontested matters can resolve within months. Contested cases involving disputed cohabitation extend longer. Courts prioritise safety matters under Section 4AA when family violence is alleged. Legal Aid NSW may cover eligible applicants in these situations.
What Derails De Facto Claims Most Often?
Incomplete Evidence Across Key Domains
De facto applications fail most often because applicants submit incomplete evidence. If you cannot demonstrate cohabitation clearly, your application weakens. Lease agreements and utility bills carry more weight than simple bank transfers.

Procedural Mistakes That Cost Thousands
Procedural mistakes in de facto applications cost significantly more than in married couple matters. You must file within two years of relationship breakdown. Many applicants treat de facto applications as simpler than married proceedings, which is a dangerous assumption.
Final Thoughts
Section 4AA of the Family Law Act requires careful preparation. The nine statutory factors form the foundation of how courts determine your rights. Missing evidence in even one domain significantly weakens your application.
The complexity of de facto claims means professional legal guidance is not optional. Contact Jameson Law today to assess whether your relationship meets the legal criteria and protect your financial future.