Procedural fairness 

Procedural fairness — historically also called natural justice — is the requirement that administrative decision-making follow a fair process. It does not guarantee a fair or correct outcome; it guarantees a fair process for reaching whatever outcome results. It rests on two limbs: the hearing rule and the rule against bias.

The hearing rule

Minister for Immigration and Border Protection v WZARH [2015] HCA 40² has since removed "legitimate expectation" as a route to either question. Kiefel, Bell and Keane JJ held at [30] that it "does not provide a basis for determining whether procedural fairness should be accorded to that person or for determining the content of such procedural fairness", and that reference to it "may well distract from the real question; namely, what is required in order to ensure that the decision is made fairly in the circumstances". Gageler and Gordon JJ made the same point at [61]. Frame the argument as practical unfairness, not disappointed expectation.

The hearing rule requires that a person whose rights or interests will be affected by a decision be given a genuine opportunity to put their case before the decision is made. Kioa v West (1985) 159 CLR 550¹ is the leading authority for this obligation — a deportation decision was set aside there because the person affected was never given a chance to respond to adverse material taken into account against them. In practice this generally means:

• fair notice of the case to be met — the person must know, in enough detail to respond meaningfully, the substance of any adverse material or issue that may affect the outcome;
• a genuine opportunity to respond — a real chance to present relevant material, address adverse information, and make submissions before the decision is finalised, not a token or after-the-fact process; and
• a decision made only after that opportunity has genuinely been afforded, rather than one where the outcome was effectively predetermined beforehand.

What the hearing rule demands is highly context-dependent. It does not always require an oral hearing, cross-examination, or legal representation; the content of the obligation flexes with the nature of the decision, the seriousness of what is at stake for the person affected, and the statutory framework within which the decision-maker operates.

The rule against bias

The rule against bias requires that the decision be made by a decision-maker who is not actually biased, and who does not appear to be biased to a fair-minded, informed observer. Actual bias — a decision-maker who has genuinely prejudged the matter or has a disqualifying interest in the outcome — is rare and hard to prove. Far more commonly litigated is apprehended bias: whether a fair-minded and informed observer, aware of the relevant circumstances, might reasonably apprehend that the decision-maker may not bring an impartial mind to the decision. Apprehended bias can arise from a financial or personal interest in the outcome, a prior involvement in the matter that compromises impartiality, or conduct or statements suggesting the decision-maker had already made up their mind before hearing the case. In SunshineLoans Pty Ltd v Australian Securities and Investments Commission [2026] HCA 8⁴, a case about a judge, the joint reasons state the apprehended bias inquiry as three steps: identify the factor said to lead the decision-maker to decide other than on the merits, articulate the logical connection between that factor and the feared departure from the merits, and only then assess whether the apprehension is reasonable. Gageler CJ and Gleeson J held that, in a bifurcated civil penalty proceeding, highly critical adverse findings in the liability judgment supplied no such connection to the penalty stage, because they were open to be made in the proper discharge of the judge's function and were available to be taken into account later. The other Justices joined in dismissing the appeal but reasoned differently, several of them at the third step, and Edelman J emphasised that proper discharge of the judicial function does not by itself preclude apprehended bias. The case concerns a judge, so carrying it to an administrative decision-maker is by analogy.

When the duty arises

Procedural fairness is not confined to decisions that look like court proceedings. Broadly, a duty to afford procedural fairness arises whenever a decision will affect a person's rights or interests — a deliberately wide trigger that extends well beyond formal legal entitlements to include, for example, the practical interest a person has in retaining a benefit, licence or status they currently hold. The duty can be excluded or modified by a sufficiently clear statute, but courts are reluctant to infer such an exclusion from anything short of clear statutory language, because procedural fairness is treated as a baseline assumption about how statutory decision-making powers are meant to be exercised.

Content is not fixed

Because the content of procedural fairness depends so heavily on context — the nature of the decision, its consequences for the individual, and the statutory scheme in which it is made — it is unhelpful to think of it as a single fixed checklist that applies identically to every decision. A decision to cancel an existing licence after a long period of reliance will generally attract more demanding procedural requirements than a routine, low-stakes administrative determination. Students should resist stating "the rules of procedural fairness" as though they were uniform, and instead ask what fairness required in this particular decision-making context.

Procedural fairness and jurisdictional error

A failure to afford the procedural fairness that the law requires is not merely a technical or minor irregularity. Statutory decision-making powers are ordinarily understood as conditioned on being exercised fairly, so a decision made in denial of procedural fairness can itself amount to jurisdictional error — meaning the decision may be treated as never having been validly made, rather than merely defective. This is one of the clearest links between procedural fairness and the broader architecture of judicial review: a fair process is not just good administrative practice, it can be a legal precondition of a valid decision at all.

No single national standard

Procedural fairness principles are shared across Australian jurisdictions as a matter of general administrative law, but the statutory context in which a particular decision is made — Commonwealth, state or territory — will shape exactly what fairness requires, and some statutory schemes contain their own codified procedures that modify the general common law position. The underlying concepts travel; the fine-grained content does not automatically transplant from one scheme to another.

A unanimous Court restated the limits in 2026. In GXT25 v Minister for Immigration and Citizenship [2026] HCA 32³ the Court applied the Alphaone principle as approved in SZBEL — and the qualifications are the part to hold onto. The decision-maker must "identify to the person affected any issue critical to the decision which is not apparent from its nature or the terms of the statute", and must "advise of any adverse conclusion which has been arrived at which would not obviously be open on the known material". Only "[s]ubject to these qualifications" is a decision-maker "not obliged to expose his or her mental processes or provisional views to comment before making the decision".

The Court then held that the duty to invite comment on adverse material from another source "does not arise if inferences supported by that information … would obviously be open on the known material". So the source of the material does not settle the question by itself: ask whether the inference drawn from it was already obviously open on what the person knew was in issue.

Applying this in a problem question

1. Identify the decision and ask whether it affects the person's rights or interests, so as to trigger a duty of procedural fairness. Do not reach for "legitimate expectation": WZARH holds that recourse to it is unnecessary and unhelpful, and it earns no marks.
2. Check whether the statute expressly or by clear implication modifies or excludes the general common law content of that duty.
3. Under the hearing rule, ask whether the person had fair notice of the case against them and a genuine opportunity to respond before the decision was made.
4. Under the bias rule, ask whether a fair-minded, informed observer might reasonably apprehend the decision-maker was not impartial.
5. If a breach is established, explain why it may amount to jurisdictional error and what remedy would follow.