QCE Legal Studies - Unit 3 - Governance in Australia
Federalism, Division of Powers and Inconsistency | QCE Legal Studies
Revise Australian federalism, exclusive, concurrent and residual powers, section 109 inconsistency and levels of government for QCE Legal Studies.
Updated 2026-05-18 - 4 min read
QCAA official coverage - Legal Studies 2025 v1.3
Exact syllabus points covered
- Describe the structure and function of the three levels of government in Australia.
- Explain the application of differing legislative powers of federal and state parliaments under the Constitution.
- Analyse the role of s 51, residual powers and s 109 inconsistency with reference to current or landmark cases.
Federalism means law-making power is divided between the Commonwealth and the states. Australia has one national government, six state governments, two mainland territory governments and local governments. Legal Studies focuses on how these systems interact and what happens when their laws overlap.
Original Sylligence diagram for legal federalism powers.
Levels of government
| Level | Main role | Examples | | --- | --- | --- | | Commonwealth | national issues | defence, immigration, currency, external affairs | | State and territory | regional legal systems and services | criminal law, schools, hospitals, transport | | Local | community services and local regulation | roads, waste, local planning |
The exact boundaries are not always neat. Health, environment, education and criminal justice can involve several levels of government at once.
Types of powers
Legal Studies often uses these categories:
- Exclusive powers: powers only the Commonwealth can exercise.
- Concurrent powers: powers both Commonwealth and states can exercise.
- Residual powers: powers left with the states because they were not given to the Commonwealth.
Section 51 is central because it lists many Commonwealth powers. However, some powers can be shared in practice. For example, both Commonwealth and state laws may operate in areas connected to taxation, corporations, health or environment.
Inconsistency under section 109
If a valid Commonwealth law and a state law are inconsistent, section 109 means the Commonwealth law prevails and the state law is invalid to the extent of the inconsistency.
Inconsistency can arise when:
- one law says "do this" and the other says "do not do this"
- a state law takes away a right or permission given by Commonwealth law
- the Commonwealth law appears intended to cover the field completely
The third type is sometimes harder. It asks whether Commonwealth Parliament intended its law to be the whole legal code for that subject.
Why inconsistency matters
Section 109 promotes legal certainty. A person should not be trapped between two inconsistent legal commands. However, it can also shift power toward the Commonwealth because a valid federal law can override state law in a shared field.
That balance is a major theme in governance. A centralised national response may be more consistent and efficient. A state-based response may be more flexible and responsive to local needs.
Worked example
Landmark case reasoning
When using case examples, do not just name the case. Explain the legal principle it demonstrates. In a federalism response, a case may show how the High Court interprets a Commonwealth head of power, how state power is limited, or how inconsistency affects the operation of legislation.
For example, a broad interpretation of the external affairs power can support Commonwealth legislation that gives effect to international obligations. That can change the practical division between Commonwealth and state law-making.
Case study: Tasmanian Dam
The Tasmanian Dam Case is the classic example of the external affairs power expanding Commonwealth influence. Tasmania wanted to build a hydroelectric dam on the Franklin River. The Commonwealth relied on Australia's international World Heritage obligations to pass legislation protecting the area. Tasmania argued that the Commonwealth was intruding into an area that would usually sit with the state.
The High Court upheld the Commonwealth law. For Legal Studies, the point is not the environmental facts alone. The point is that international obligations can connect to s 51 external affairs, allowing the Commonwealth to legislate in areas that might otherwise look like residual state matters. This shows how constitutional interpretation can shift the practical balance of federalism.
Evaluation
Federalism can strengthen governance because it spreads power, allows local variation and creates multiple levels of accountability. It can weaken governance when responsibilities overlap, funding is contested or people are unsure which government is responsible.