What Is the Legal Definition of a De Facto Relationship for a Visa?

The legal definition of a de facto relationship for a visa is in section 5CB of the Migration Act. An unmarried couple are de facto partners if they share a mutual commitment to a shared life to the exclusion of all others, have a genuine and continuing relationship, live together or not apart permanently, and are not related by family.
Wondering whether your relationship meets the legal definition? Tell us how you met, where you live and how you share your lives.

Key points

  • Section 5CB of the Migration Act defines de facto partner and de facto relationship, for couples of the same sex or a different sex.
  • Regulation 1.09A of the Migration Regulations lists the matters the Department considers: financial aspects, the nature of the household, social aspects and the nature of the commitment.
  • For a partner visa, the de facto relationship must generally have existed for 12 months before lodgement, unless an exception applies (regulation 2.03A).

What are the elements of a de facto relationship under the Migration Act?

The elements of a de facto relationship under section 5CB of the Migration Act are that the couple is not married to each other, has a mutual commitment to a shared life to the exclusion of all others, has a relationship that is genuine and continuing, lives together or does not live separately and apart on a permanent basis, and is not related by family. Every element must be met. A couple who meets most of them but not all does not have a de facto relationship for migration purposes. Our guide to the de facto partner visa explains how each element is applied.

What does exclusion of all others mean?

Exclusion of all others means the relationship is exclusive, so neither partner is in another de facto relationship or marriage at the same time in a way that competes with this one. A partner who is still legally married to someone else is not automatically excluded, but must show that the earlier relationship has ended in substance. Our article on partner visas while married to someone else explains how this is assessed.

How does the Department decide whether a de facto relationship is genuine?

The Department decides whether a de facto relationship is genuine by considering all the circumstances, including the four matters in regulation 1.09A: the financial aspects of the relationship, the nature of the household, the social aspects and the nature of the commitment. No single document decides the question. The Department weighs the evidence as a whole and looks for consistency between the couple's accounts. Our article on proving your relationship is genuine explains what case officers look for.

Does the definition differ from family law?

The migration definition of a de facto relationship is separate from the definition used in family law, and the two should not be treated as interchangeable. A couple recognised as de facto partners for a property or parenting matter is not automatically recognised for a visa, and the reverse is also true. For a visa, the test in section 5CB and the evidence considered under regulation 1.09A are what count. The Department also expects the evidence to cover the four pillars of the relationship, whatever another court or agency has decided.

Does the legal definition apply to same-sex couples?

The legal definition of a de facto relationship applies equally to same-sex couples. Section 5CB expressly covers partners of the same sex or a different sex, and the evidence requirements are the same. Some couples face particular evidence issues, for example where the relationship has not been disclosed to family. Our page on the LGBTI partner visa explains how these situations are presented.

How does My Migration Lawyers apply the legal definition to your relationship?

My Migration Lawyers applies the legal definition to a relationship by testing each element of section 5CB against the couple's actual history and documents, and identifying any element that is weak before the Department does. Where an element is in doubt, such as an earlier marriage not yet formally ended or a period living apart, the firm explains it in the application with supporting evidence. Couples can speak with our partner visa lawyers about how the definition applies to them.

MML
Speak To Our Lawyers

Get Clear Answers on Your Visa Options

Send us the details of your situation. One of our migration lawyers will review it and get back to you with clear advice on what you can do next and what it involves.
‍
Partner visas, protection visas, refusals and cancellations, ART review, judicial review, complex matters, corporate migration.

I came to this firm for help with my protection visa because I was very confused about the process. They listened to my situation carefully and explained what information and documents would be important. I feel much more comfortable having professional help with everything.

MML

Mariam K

Connect with our friendly team

1300 040 300
Or fill in the form & we'll call you
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
MML
About the Reviewer

Who Reviewed This Page

Weiwei Zhang is an Australian lawyer practising exclusively in Australian migration law and is the Principal Lawyer at My Migration Lawyers. She reviews the firm's published legal guidance for accuracy.
Weiwei Zhang, Principal Lawyer at My Migration Lawyers

Weiwei Zhang

Managing Director and Principal Lawyer, My Migration Lawyers
Weiwei Zhang, Principal Lawyer at My Migration Lawyers
Weiwei Zhang
Principal Lawyer
Weiwei Zhang is an Australian lawyer practising exclusively in Australian migration law and is the Principal Lawyer at My Migration Lawyers. She reviews the firm's published legal guidance for accuracy.
Last Reviewed
October 8, 2026
Question not answered here? Ask our lawyers directly.