"Marriage involves a number of legal rights and duties. If a man and woman live together as husband and wife but are not legally married, the legal consequences may be different from those arising from a legal marriage." (www.liv.asn.au)
The length of a de facto relationship can help to decide wills, intestacy, property settlements and maintenance after the breakdown of a relationship or the death of a partner. The nature of their assets and how those assets were acquired will help to determine property settlements.
The existence of a sexual relationship may help to establish the actual existence of the relationship. The degree of financial independence each partner has may affect, upon failure of the relationship, the contributions made from each partner and any property distribution and maintenance.
The de facto couple's genuine domestic arrangements and whether they have had children can determine, upon the breakdown of a de facto relationship, the property, maintenance and other financial support. Generally there is no duty between de facto partners to maintain one another. (http://elo.legalaid.qld.gov.au)
All of the pre-mentioned components can have an impact on the rights and obligations of a de facto relationship.
Present Laws
A de facto relationship can be described as the relationship between a man and a woman who are known to live together as husband and wife but have not entered into any legally binding agreements.
The Family Law Act and the Property Law Act both address issues concerning de facto relationships.
The Family Law Act 1975 (Cth)
The Family Law Act is a federal Act, which applies to all issues relating to children following the breakdown of a relationship whether the parents are married, have lived together in a de facto relationship or never lived together. Matters of child support, orders dealing with residence and contact and specific issues in relation to children are all dealt with by the Family Court.