
Australia's legal system is based on common law principles inherited from the English legal system during colonisation. This superseded Indigenous Australian customary law, despite Australia being considered settled rather than conquered. The Australian legal system includes a written constitution, unwritten constitutional conventions, statutes, regulations, and the judicially determined common law system. Common law principles provide judges with precedents and wider common law principles from similar cases to help them make their decisions. These precedents are based on the decisions of judges in superior courts. The doctrine of precedent provides an important constraint on judicial decision-making, requiring judges to pay respect to past decisions and make consistent rulings.
| Characteristics | Values |
|---|---|
| Australia's legal system is inherited from England | English common law |
| Australia is a common-law jurisdiction | Common law |
| Common law provides judges with precedents and principles from similar cases to help them make decisions | Consistency with past decisions |
| Common law principles contain concepts intended to provide protection regarding children and people with disabilities | Human rights |
| Common law courts have the power to protect human rights principles | Human rights |
| Common law courts must presume that Parliament does not intend to limit fundamental rights | Fundamental rights |
| Common law courts must presume consistency with international law obligations, including human rights treaty obligations | International law obligations |
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What You'll Learn
- Australia's legal system is inherited from England
- Indigenous Australian customary law was superseded during colonisation
- Common law provides judges with precedents to help them make decisions
- Common law includes concepts to protect children and people with disabilities
- Common law courts can protect human rights principles

Australia's legal system is inherited from England
The Australian legal system has multiple forms, including a written constitution, unwritten constitutional conventions, statutes, regulations, and the judicially determined common law system. The common law system provides judges with years of precedents and wider common law principles from similar cases to help them make their decisions consistent with established precedents. This is known as the doctrine of precedent, which means to 'stand by that decided'. This doctrine is an important constraint on judicial decision-making, requiring judges to pay proper respect to past judicial decisions and make consistent decisions. In some cases, parliaments do not agree with judges' decisions, and may enact legislation to mitigate the legal consequences.
The Australian Constitution, which came into force on 1 January 1901, sets out a federal system of government. The Constitution establishes the form of the federal government and sets out the basis for relations between the Commonwealth and the states. The Commonwealth Parliament has the power to make laws which affect all people living in Australia, but this power is limited to the subject matters listed in the Constitution. The states are separate jurisdictions with their own system of courts and parliaments, and are vested with plenary power.
In the last quarter of the 20th century, there has been a growing divergence between Australian and English common law. A large body of English law received in Australia has been progressively repealed in state parliaments.
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Indigenous Australian customary law was superseded during colonisation
Indigenous Australian customary law, or lore, refers to the unique legal systems and practices of Indigenous Australians, including Aboriginal and Torres Strait Islander people. These laws are passed down orally and are intertwined with cultural customs, practices, and stories from the Dreamtime. They dictate the rules for interacting with the land, kinship, and community. However, during colonisation, Indigenous Australian customary law was superseded by English common law.
When the British colonised Australia, they assumed the legal fiction of Australia as terra nullius, ignoring Indigenous ownership of the land and the existence of established legal systems. This resulted in the imposition of English law on the colony, with the Australian Courts Act 1828 confirming that all English common and statute law up to that point would be applied in what is now New South Wales, Tasmania, Victoria, and Queensland. The reception of English law in Western Australia and South Australia was later established by statute in the late 1820s and 1836, respectively.
The legal institutions and traditions of Australia are substantially derived from the English legal system, which replaced Indigenous Australian customary law. This is reflected in Australia's court system, which originated in the common law system of English law and is uniform across the states and territories. While Australia has since gained legislative independence, the country's legal foundations were established during colonisation, shaping the Australian legal system as it stands today.
It is important to note that Indigenous customary law is not uniform across Australia, and different language groups, clans, and regions have varying concepts of customary law. Despite this lack of uniformity, Indigenous legal systems were largely ignored during colonisation, with English law being imposed across the colonised territories. In recent years, there have been efforts to recognise Indigenous customary law, with some statutes and courts in the Northern Territory making explicit reference to customary law when identifying relationships and social expectations. Additionally, in 1992, post-colonial law recognised Indigenous lore as giving rise to a valid legal claim in the Mabo decision, discarding the legal fiction of terra nullius.
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Common law provides judges with precedents to help them make decisions
Australia inherited its legal system from England when it was colonised in 1788. The Australian legal system has multiple forms, including a written constitution, unwritten constitutional conventions, statutes, regulations, and the judicially determined common law system. Common law, or case law, is based on the decisions of judges in superior courts. Over the years, judges' decisions have developed a body of legal principles known as common law, which they refer to when making decisions on new cases.
In some cases, parliaments may not agree with a judge's decision. If the Commonwealth is a party to the proceedings, it may appeal to a higher court until the High Court makes a decision. If the Commonwealth is not a party to the proceedings, or the High Court has already decided the matter, parliaments can enact legislation to mitigate the legal consequences of the decision.
Common law principles contain concepts intended to provide protection for children and people with disabilities in some areas. For example, in the Teoh case, the High Court Chief Justice and Justice Deane stated that:
> Where a statute or subordinate legislation is ambiguous, the courts should favour that construction which accords with Australia's obligations under a treaty or international convention to which Australia is a party, at least in those cases in which the legislation is enacted after, or in contemplation of, entry into, or ratification of, the relevant international instrument. That is because Parliament, prima facie, intends to give effect to Australia's obligations under international law.
While common law courts have the power to provide significant protection of human rights principles, in some instances, this has led to further breaches of human rights. For example, a person with a disability who is found unfit to plead to criminal charges may be detained indefinitely, without the courts having found any capacity to remedy the obvious breaches of ICCPR Article 9.
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Common law includes concepts to protect children and people with disabilities
The Australian legal system has multiple forms, including a written constitution, unwritten constitutional conventions, statutes, regulations, and a judicially determined common law system. The legal institutions and traditions of Australia are largely derived from English law, which superseded Indigenous Australian customary law during colonisation.
Common law principles contain concepts intended to provide protection for children and people with disabilities. For example, the Individuals with Disabilities Education Act ensures that all children with qualifying disabilities have access to a free and appropriate public education. Schools are required to provide an education at public expense and under public supervision and direction, conduct an evaluation to determine the child's educational needs, and produce an individualised education program.
In the context of child welfare, the ADA and Section 504 of the Rehabilitation Act of 1973 protect parents and prospective parents with disabilities from unlawful discrimination in the administration of child welfare programs, activities, and services. However, in some cases, a parent or prospective parent with a disability may pose a significant risk to the health or safety of a child that cannot be mitigated by reasonable modifications. In these cases, child welfare agencies and courts must make decisions to protect the safety of the child, based on an individualised assessment and objective facts.
While common law courts have the power to provide significant protection of human rights principles, in some instances, relevant statutory provisions and a lack of appropriate administrative and policy settings have led to breaches of human rights. For example, a person with a disability found unfit to plead to criminal charges may be detained indefinitely, with courts unable to remedy the obvious breaches of ICCPR Article 9.
Overall, while common law principles in Australia offer some protection for children and people with disabilities, there may be situations where further breaches of human rights occur due to statutory provisions and inadequate administrative frameworks.
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Common law courts can protect human rights principles
Australian law is based on common law principles due to its history as a colony of the British Empire. During colonisation, English common law superseded Indigenous Australian customary law. The Australian Courts Act 1828 confirmed the application of English common law in what would become Australia's eastern states. This was later extended to Western Australia and South Australia.
A well-established principle of statutory interpretation in Australian courts is that Parliament is not presumed to have intended to limit fundamental rights unless it is indicated in clear terms. This presumption constitutes a substantial level of protection for the "principle of legality". This principle also applies to Australia's obligations under international law and human rights treaties.
While common law courts can protect human rights principles, there has been a growing divergence between Australian and English common law since the late 20th century. This has resulted in the repeal of a large body of English law in Australia, indicating a move towards legislative independence.
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Frequently asked questions
Australian law is based on common law principles because the country inherited its legal system from England during colonisation in 1788.
Common law, or case law, is a body of legal principles developed by judges over hundreds of years. It is based on the decisions of judges in superior courts.
The doctrine of precedent, or 'stand by that decided', is a key principle in common law. It means that judges must respect past judicial decisions and make consistent rulings. When a precedent is not followed, the judge must explain their reasoning.
Common law includes principles that protect the rights of children and people with disabilities. It also upholds the rule of law and assumes that parliament does not intend to limit fundamental rights.























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