Proportionality in Australian Law
Introduction
Proportionality is a doctrinal tool used across multiple domains of Australian law, operating as a criterion for assessing the justification of governmental action that burdens rights, interests, or values. Its application varies markedly between constitutional law, administrative law, sentencing law, and the statutory human rights frameworks operating in the Australian Capital Territory and Victoria.
Proportionality in Constitutional Law
The High Court’s engagement with proportionality in constitutional adjudication has evolved significantly. The traditional approach characterised constitutional limitations by asking whether a law was “appropriate and adapted” to a legitimate purpose — a formulation that eschewed the structured balancing characteristic of European proportionality regimes.
In McCloy v New South Wales (2015) 257 CLR 178, a majority of the High Court (French CJ, Kiefel, Bell, and Keane JJ) adopted a “structured proportionality” test for assessing whether a law impermissibly burdened the implied freedom of political communication. The test operates in two stages:
- Purpose: Does the law effectively burden the freedom in pursuit of a legitimate purpose?
- Proportionality: Is the law suitable, necessary, and adequate in its balance?
Under this framework, suitability requires a rational connection between the means adopted and the purpose served. Necessity demands that no equally effective but less rights-restrictive alternative exists. Adequate in balance requires that the benefits of the measure outweigh the burden on the freedom.
The application of this framework was further refined in Brown v Tasmania (2017) 261 CLR 328, where the High Court struck down provisions of Tasmanian protest law that prohibited certain protest activities near business premises, finding that the law failed the necessity and adequate-balance limbs. In Clubb v Edwards (2019) 267 CLR 171, the Court applied the structured proportionality test to “safe access zone” legislation around abortion clinics, upholding the laws as compatible with the implied freedom.
A significant division emerged in LibertyWorks Inc v Commonwealth (2021) 273 CLR 504, where the Court divided on whether the structured proportionality test from McCloy should be confined to cases involving the implied freedom or extended to all constitutional limitations. This remains a live controversy in Australian constitutional law.
Proportionality in Administrative Law
In administrative law, proportionality functions within the framework of judicial review of executive action, primarily through the ground of unreasonableness. The common law standard is encapsulated in the Wednesbury formulation — a decision is unreasonable if it is “so unreasonable that no reasonable decision-maker could have made it.”
In Minister for Immigration and Citizenship v SZMDS (2010) 240 CLR 611, the High Court confirmed that “illogicality” or “irrationality” in fact-finding constitutes a distinct ground of review, distinct from jurisdictional error. Crennan and Bell JJ held that a decision will be legally unreasonable if it is “irrational, illogical and not based on findings or inferences of fact supported by logical grounds.”
This standard was refined in SZVFW v Minister for Immigration and Border Protection (2018) 262 CLR 189, where the Court confirmed that unreasonableness review extends to the outcome of the decision-making process and not merely the reasoning path. Gageler J observed that legal unreasonableness is “a standard which is always available to be invoked and which is always invoked at the margins of decisional discretion.”
Proportionality in Sentencing Law
In sentencing, proportionality functions as a “cardinal principle” limiting the severity of punishment. In Veen v The Queen (No 2) (1988) 164 CLR 465, the High Court (Mason CJ, Brennan, Dawson, and Toohey JJ) held that a sentence must be “proportionate” to the gravity of the offence — the principle that a sentence should not exceed what is “proportionate to the gravity of the offence having regard to the objective circumstances.”
The principle operates in two dimensions:
Retributive proportionality: The “maximum sentence for the worst case” principle — the maximum penalty should be reserved for the worst category of offending.
Totality principle: Where an offender is sentenced for multiple offences, the aggregate sentence must be “just and appropriate” and not excessive in total. This requires a “final review” of the total effective sentence to ensure it bears a proper relationship to the overall criminality.
Proportionality under Human Rights Charters
The Victorian Charter of Human Rights and Responsibilities Act 2006 and the Human Rights Act 2004 (ACT) incorporate proportionality through “reasonable limits” clauses. Section 7(2) of the Victorian Charter provides that human rights may be subject only to “reasonable limits as can be demonstrably justified in a free and democratic society.”
In Momcilovic v The Queen (2011) 245 CLR 1, the High Court considered the application of s 7(2) and confirmed that proportionality analysis under the Charter requires a structured inquiry into: the nature of the right, the importance of the purpose, the nature and extent of the limitation, the relationship between the limitation and its purpose, and whether less restrictive means exist.
The ACT Supreme Court has developed a similar methodology in Castles v Secretary of the Department of Justice (2010) 28 VR 141, applying a “proportionality test” derived from Canadian and South African jurisprudence.
Conclusion
Proportionality in Australian law is not a unified doctrine but a “family” of analytical approaches that share a common concern with the relationship between means and ends, and the justification of governmental action that infringes rights or interests. Its constitutional trajectory suggests an increasing willingness by the High Court to engage in structured balancing, while its administrative law application remains more constrained.