Separation of Powers and Checks and Balances - TCE Legal Studies (Tasmania)
“Explain the separation of powers into legislative, executive and judicial branches and the role of checks and balances.”
The separation of powers divides government into three branches: the legislature (makes law), the executive (carries out law) and the judiciary (interprets and applies law). Keeping these powers in separate hands, with each able to check the others, prevents any one body from gaining absolute power.
What this dot point is asking
This dot point asks you to explain the three branches of government, why power is separated, and how checks and balances keep that power limited.
The three branches
Government power in Australia is divided into three functions:
- The legislature is parliament, which makes and changes the law. Federally this is the Commonwealth Parliament; in Tasmania it is the House of Assembly and the Legislative Council.
- The executive carries out and administers the law. This includes the Prime Minister or Premier, the Cabinet, government departments and the public service. Formally, executive power is vested in the Crown and exercised by the Governor-General or Governor on the advice of ministers.
- The judiciary interprets the law and resolves disputes through the courts, from the Magistrates Court up to the High Court of Australia.
The principle that the three functions of government (legislative, executive and judicial) should be exercised by separate bodies, so that power is not concentrated in a single set of hands.
Why power is separated
The principle rests on a suspicion of concentrated power. If one person or group controlled law-making, enforcement and judgment, there would be nothing to stop tyranny. By splitting these functions, each branch can act as a brake on the others. The Australian Constitution reflects this structure: Chapter I deals with the Parliament (legislative power), Chapter II with the Executive Government, and Chapter III with the Judicature (judicial power).
How strict is the separation in Australia?
The separation is not complete. Australia uses the Westminster system, in which the executive is drawn from the legislature: ministers must be members of parliament, so the legislative and executive branches overlap in personnel. The strongest separation is between the judiciary and the other two branches. The High Court has firmly protected judicial independence, holding that Commonwealth judicial power can only be exercised by Chapter III courts. Judicial independence is reinforced by secure tenure and the fact that judges cannot be removed except by parliament for proven misbehaviour or incapacity.
In practice the legislature and executive overlap because ministers sit in parliament. The clearest and most strongly protected separation is the independence of the judiciary, which keeps courts free from political control so they can decide cases impartially, including cases against the government.
Checks and balances
Checks and balances are the mechanisms that let each branch limit the others, ensuring no branch acts beyond its proper authority. Examples in Australia include:
- The judiciary checks the legislature and executive through judicial review. Courts can declare a law invalid if it exceeds constitutional power, and can find executive action unlawful.
- The legislature checks the executive through responsible government: ministers must answer to parliament, and the government must keep the confidence of the lower house.
- The upper house (the Senate federally, the Legislative Council in Tasmania) reviews and can amend or reject legislation passed by the lower house.
- The executive, through the Crown's representative, gives royal assent to bills and can in limited circumstances dissolve parliament.
These overlapping controls mean that ambition is made to counter ambition, so power is dispersed rather than concentrated.
A common task asks you to connect the structure to its protective purpose. Work through it in steps.
Step 1: Set up the three branches
State that legislative, executive and judicial power are placed in separate institutions (Chapters I, II and III of the Constitution), so that the power to make, enforce and judge the law is not held by one body.
Step 2: Show the overlap honestly
Explain that the legislature and executive overlap because the Westminster system draws ministers from parliament, so the separation between them is partial rather than strict.
Step 3: Identify the checks
Give concrete checks: judicial review lets courts invalidate laws beyond power; responsible government forces ministers to answer to parliament; the upper house can amend or reject bills.
Step 4: Reach the judgement
Conclude that these overlapping controls disperse power, with the independent judiciary as the strongest safeguard, so ambition is made to counter ambition rather than concentrate.
A common error is to claim the three branches are entirely separate. In the Westminster system the executive sits inside the legislature, so there is significant overlap between those two. The accurate point is that the separation is partial, with the independence of the judiciary being the most strictly maintained element.
For exam answers, name and define the three branches, explain the rationale of preventing concentrated power, then describe at least two specific checks and balances, noting that the judiciary is the most clearly separated branch in the Australian system.
Exam-style questions
Questions in the style of TASC exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Practice6 marksName the three branches of government and state the main function of each.Show worked answer →
A 6 mark response needs all three branches correctly named and the function of each stated clearly.
The legislature. This is the parliament, which makes and changes the law. Federally it is the Commonwealth Parliament; in Tasmania it is the House of Assembly and the Legislative Council.
The executive. This carries out and administers the law. It includes the Prime Minister or Premier, the Cabinet, government departments and the public service, with formal power vested in the Crown's representative acting on ministerial advice.
The judiciary. This interprets and applies the law and resolves disputes through the courts, from the Magistrates Court up to the High Court of Australia.
Markers reward the correct pairing of each branch with its function, especially distinguishing making law (legislature) from carrying it out (executive).
Practice12 marksExplain the separation of powers and analyse how effectively checks and balances limit the concentration of power in the Australian system.Show worked answer →
A 12 mark response needs the doctrine, the checks and balances, and an analysis of how well they work.
Doctrine. Government is divided into three branches so that no single body makes, enforces and judges the law. The Constitution reflects this: Chapter I (Parliament), Chapter II (Executive) and Chapter III (Judicature).
Strictness in Australia. Be precise that the separation is partial. Under the Westminster system the executive is drawn from the legislature, because ministers must sit in parliament, so those two branches overlap in personnel. The strongest separation is the independence of the judiciary, which the High Court has firmly protected.
Checks and balances. Identify at least three working mechanisms: judicial review (courts can declare a law invalid for exceeding constitutional power or find executive action unlawful); responsible government (ministers must answer to parliament and keep the confidence of the lower house); and the upper house reviewing, amending or rejecting bills.
Analysis. Judge the system as a real but imperfect dispersal of power. The judicial check is genuine and independent; the legislative check on the executive is weakened by party discipline, which can let a majority government dominate the lower house. Markers reward a defended judgement, not just a list.