LAW5004 · Principles of Public Law and Statutory Interpretation
Parliament & Legislative Power
This chapter of the Monash University LAW5004 Principles of Public Law and Statutory Interpretation study guide is the validity gateway of the unit: it explains parliamentary sovereignty and how Australia divides law-making power between two engines. A State Parliament holds plenary power within its grant, while the Commonwealth Parliament has only enumerated heads (ss 51 and 52), with s 109 giving Commonwealth law paramountcy and s 128 fixing the rigid path to amend the Constitution.
What this chapter covers
- 01What parliamentary sovereignty means (Dicey's three limbs) and why courts review power, not the justice of a law
- 02Why Dr Bonham's Case is rejected in Australia, and how the rule of law is an assumption, not a power to strike laws down
- 03State legislative power as plenary within the grant: 'peace, welfare and good government' are not words of limitation (Union Steamship)
- 04That there is no fundamental-rights restraint on State power (Kable, Dawson J; Durham Holdings)
- 05Commonwealth power as enumerated: validity turns on a real connection to a head of power in s 51 or s 52
- 06Why a recital of necessity cannot bootstrap a Commonwealth law into power (Communist Party Case)
- 07That once a Commonwealth law is genuinely connected, its harshness is irrelevant (Leask)
- 08The specific limits to scan on each side: Kable doctrine, s 109 inconsistency, s 117, s 92 and the implied freedom of political communication
- 09How s 109 (paramountcy), s 128 (rigid amendment) and s 122 (Territory power) fit the federal structure
- 10How to structure a validity answer in IRAC and pick the correct engine in your first sentence
Is an extreme statute valid — and does it matter which Parliament passed it?
- +2Issue. Identify the legal question and separate it from the moral one: is a State law valid despite being harsh and providing no compensation, and does any specific constitutional limit make it invalid? Unfairness is not itself a ground of invalidity.
- +3Rule. State legislative power is plenary within the grant: 'peace, welfare and good government' are not words of limitation (Union Steamship v King). There is no fundamental-common-law-rights restraint on that supremacy (Kable, Dawson J), and even a right to adequate compensation is not such a restraint (Durham Holdings v NSW). The justice or wisdom of a law is for the Legislature, not the courts (Burton v Honan). A State law falls only to a specific limit: the Kable doctrine, s 109 inconsistency, s 117, s 92, or the implied freedom of political communication.
- +3Application. The Act's unfairness and the absence of compensation do not invalidate it — Durham Holdings confirms a compensation right is not a restraint on plenary State power. Crucially, the s 51(xxxi) just-terms guarantee binds the Commonwealth, not the States, so it gives the company no protection against a State resumption. So scan the closed list of specific limits: is there an inconsistent valid Commonwealth law (s 109)? does the Act conscript a court in a way that offends the Kable doctrine? does it burden the implied freedom of political communication? On these facts none is obviously engaged by a bare land resumption.
- +2Conclusion. The Act is likely valid as an exercise of plenary State power; its harshness and its failure to compensate are not grounds of invalidity, and s 51(xxxi) does not bind a State. It would fail only if a specific limit bites. The company's real remedy for the injustice is political, not judicial.
Key terms
- Parliamentary sovereignty
- Dicey's principle that Parliament may make or unmake any law, no Parliament binds a later one, and no court may hold a valid Act invalid for being unjust. In a federation the sovereignty is divided and limited by the Constitution, so it means plenary power within the granted field, policed by the High Court.
- Plenary power (within the grant)
- The nature of State legislative power: as full as the Imperial Parliament's within the State's constitutional grant. The words 'peace, welfare and good government' describe the grant; they do not limit it (Union Steamship v King).
- Enumerated power
- The nature of Commonwealth legislative power: the federal Parliament has only the subject-matters the Constitution grants it. Validity of a Commonwealth law therefore turns on its connection to a head of power in s 51 or s 52.
- Head of power / sufficient connection
- A subject-matter on which the Commonwealth may legislate (e.g. s 51(xix) aliens, s 51(vi) defence). A Commonwealth law is valid if it has a real, sufficient connection to such a head; once connected, its harshness or disproportion is irrelevant (Leask v Commonwealth).
- Anti-bootstrapping (Communist Party Case)
- A Commonwealth Parliament cannot recite itself into power. A statute's own declaration that it is 'necessary' does not supply the connection to a head of power; the connection must be real and judged by the court (Australian Communist Party v The Commonwealth).
- s 109 inconsistency
- Where a valid Commonwealth law and a State law are inconsistent, the Commonwealth law prevails and the State law is inoperative to the extent of the inconsistency. It is the paramountcy rule that resolves federal-State legislative clashes.
- s 128 amendment
- The rigid procedure for changing the Constitution: passage by an absolute majority of each House (or the s 128 deadlock route), then a referendum carried by a national majority of voters and a majority of the States — the 'double majority' that makes amendment hard.
- Implied freedom of political communication
- An implication drawn from the Constitution's system of representative and responsible government that restrains laws burdening communication on government or political matters. It is a limit (not a personal right) to scan against both State and Commonwealth laws.
Parliament & Legislative Power FAQ
Can an Australian court strike down a law just because it is unjust or cruel?
No. Courts review the power to make a law, not its justice or wisdom. A court can invalidate a statute only for want of constitutional power or breach of a specific constitutional limit — never for injustice alone. The rule of law is an assumption of the Constitution (Communist Party Case) but does not expand judicial power beyond the text and structure (Palmer v Western Australia); the justice of a law is 'entirely for the Legislature' (Burton v Honan). The remedy for an unjust valid law is political.
What is the difference between State and Commonwealth legislative power?
State power is plenary within the grant: the words 'peace, welfare and good government' are not words of limitation (Union Steamship), and there is no fundamental-rights restraint (Kable; Durham Holdings), so a State law falls only to a specific limit such as the Kable doctrine, s 109, s 117, s 92 or the implied freedom. Commonwealth power is enumerated: a federal law is valid only if it genuinely connects to a head of power (ss 51/52), a recital cannot bootstrap it (Communist Party Case), and once connected its harshness is irrelevant (Leask). Pick the correct engine before you analyse.
Can AI help me with parliamentary sovereignty and legislative power in LAW5004?
Yes — used well. An AI tutor like Sia can explain parliamentary sovereignty, the plenary-versus-enumerated distinction and cases such as Union Steamship, the Communist Party Case, Kable and Leask step by step, quiz you on the section numbers (ss 51/52/109/128), and mark a practice IRAC answer against a rubric so you see where the marks sit. It cannot sit your assessment for you or promise a grade, and the final examination is an open-book eExam with an additional device, so any permitted AI use must follow your unit's rules and be acknowledged where required — confirm what is allowed on Moodle. Treat AI as a way to understand the reasoning, then write the answer yourself.
Studying with AI? Sia — free AI law tutor works through LAW5004 step by step.
Exam move
Anchor everything to the two engines and decide which one applies before you write a word. For a State law, start from plenary power within the grant (Union Steamship), remember that neither injustice nor the absence of compensation invalidates it (Kable, Dawson J; Durham Holdings; and note s 51(xxxi) just terms binds only the Commonwealth), then scan the closed list of specific limits — the Kable doctrine, s 109, s 117, s 92 and the implied freedom. For a Commonwealth law, prove a real connection to a head of power in s 51 or s 52, reject any attempt to bootstrap validity by recital (Communist Party Case), and only then note that harshness is irrelevant (Leask) before overlaying the express and implied limits. Keep every holding's direction exact, because a reversed rule is the costliest error here. Drill the section numbers (ss 51/52/109/128/122) as flashcards and rehearse two full IRAC answers — one State, one Commonwealth — under timed conditions in the revision week. Because the final is an open-book eExam, do not plan to transcribe cases; plan to apply them. The exam's duration is not fixed in the unit materials, so confirm it on Moodle and the JD examination timetable and, once you know the total minutes and marks, budget roughly in proportion (about total-minutes divided by total-marks per mark) so every question gets its share.
