McHugh J, in concurring with the judgment of Hayne J, albeit subject to number of reservations, said at 421:
The first matter to which I refer is his Honour's discussion of the capacity of the States to bind the Commonwealth. I have expressed my views on that subject in my judgment in Re Residential Tenancies Tribunal (NSW); Ex parte Defence Housing Authority (1997) 190 CLR 410 in terms which do not fully accord with the discussion of Hayne J in this case. No doubt it will some day be necessary to determine whether the views expressed by Dawson , Toohey and Gaudron JJ in Re Residential Tenancies (1997) 190 CLR 410 to which Hayne J refers have finally settled the question of the States' capacity to bind the Commonwealth. But it is not necessary to do so for the purposes of this case.
37 The High Court had shortly before deciding that case given further consideration to the issue of Commonwealth immunity from State laws in Re Residential Tenancies Tribunal of New South Wales; ex parte Defence Housing Authority . In those proceedings, the Defence Housing Authority leased a home unit for the purpose of sub-leasing the premises to defence personnel. The owner of the unit sought to enter and inspect the unit pursuant to s 24 of the Residential Tenancies Act 1987 and, upon being refused, sought orders from the Residential Tenancies Tribunal. The Defence Housing Authority argued that the New South Wales law had no application to the Commonwealth. All members of the High Court concluded that the Cigamatic doctrine did not prevent the New South Wales law applying to the Commonwealth, although Kirby J dissented on a basis not presently relevant.
38 Dawson , Toohey and Gaudron JJ observed that a distinction may be drawn between the capacities of the Commonwealth and the exercise of those capacities. Their Honours held, at 438 - 439:
It is necessary at the outset to observe a distinction between the capacities of the Crown on the one hand, by which we mean its rights, powers, privileges and immunities, and the exercise of those capacities on the other. In referring to the capacities of the Crown so defined, we are speaking of the same thing of which Dixon J spoke when he used the words "capacity or functions" in West v Commissioner of Taxation (NSW) (1937) 56 CLR 657 at 682 in quoting from the dissenting judgment of Isaacs J in Pirrie v McFarlane (1925) 36 CLR 170 at 191. Elsewhere he used other expressions to convey essentially the same meaning, such as the "governmental rights and powers belonging to the Federal executive as such" or "the rights or privileges, duties or disabilities, of the Commonwealth in relation to the subjects of the Crown". In Cigamatic (1962) 108 CLR 372 at 378, Dixon CJ also spoke of the "legal rights of the Commonwealth in relation to its subjects" and that expression is, as shall appear, of some use in applying the principle which he expounded.
The purpose in drawing a distinction between the capacities of the Crown and the exercise of them is to draw a further distinction between legislation which purports to modify the nature of the executive power vested in the Crown that is, its capacities, and legislation which assumes those capacities and seeks only to regulate activities in which the Crown may choose to engage in the exercise of those capacities.
39 Their Honours saw the decision in Cigamatic as meaning that a State legislature could not impair the capacities of the Commonwealth executive, but at the same time that the Commonwealth might be regulated by State laws of general application in those activities which it carried on in common with other citizens. Their Honours' consideration continued (at 440):
The States … do not have specific legislative powers which might be construed as authorising them to restrict or modify the executive capacities of the Commonwealth. The legislative power of the States is an undefined residue which, containing no such authorisation, cannot be construed as extending to the executive capacities of the Commonwealth. No implication limiting an otherwise given power is needed; the character of the Commonwealth as a body politic, armed with executive capacities by the Constitution, by its very nature places those capacities outside the legislative power of another body politic, namely a State, without specific powers in that respect. Having regard to the fundamental principle recognised in Melbourne Corporation v The Commonwealth , only an express provision in the Constitution could authorise a State to affect the capacities of the Commonwealth executive and there is no such authorisation.
40 McHugh and Gummow JJ also held that the Defence Housing Authority was not entitled to the protection of the Cigamatic doctrine, as the doctrine has no application to legal rights which are sourced in or the immediate product of federal statute as, except to the extent that the rights are protected by s 109 of the Constitution , State law applies to them (see Residential Tenancies Tribunal at 458 - 459 and 469 - 470, respectively). Their Honours, however, did not consider the distinction between the capacities of the Commonwealth and the exercise of those capacities pertinent. McHugh J concluded that a State law could regulate a relationship created between the Commonwealth and a subject, but once the Commonwealth in the exercise of its executive power under s 61 of the Constitution entered a relationship creating rights and duties, a State could not change the nature and effect of the legal rights. His Honour specifically referred to the question of whether a State law can prevent the Commonwealth from using its right to forfeit a lease or terminate an employment. His Honour held, at 454 - 455:
The executive capacity of the Commonwealth can only mean its legal right or power to do or refrain from doing something. I cannot see any constitutional rationale for a doctrine that would hold, for example, that the States cannot prevent the Commonwealth from entering into a specific class of contract but can alter the legal rights and obligations of the Commonwealth and the subject once they have entered into a contract of that class. Moreover, the distinction between a capacity of the Commonwealth and its exercise is not easily drawn. If a State law prevents the Commonwealth from using its contractual right to forfeit a lease or terminate an employment, is the State law fettering a Commonwealth capacity or only the exercise of it?
In most cases, State law including the common law will govern the creation of a relationship between the Commonwealth and a subject even when the creation of the relationship arises from the Constitution's grant of executive power. If the Commonwealth chooses to enter into the relationship without negating the consequences of relevant State law, it necessarily submits to the State law governing the incidents of the relationship. But, for the reasons given by Dixon CJ in Cigamatic , once the Commonwealth has entered into such a relationship and created legal rights and duties in accordance with that State law, it is not open to the State to change their nature or effect. If the Commonwealth enters into a contract relying on the grant of executive power conferred by s 61 of the Constitution , a State has no power to change the consequences of that contract even by a law of general application.
41 His Honour later (at 457 - 458) said:
If a State law attempted to discriminate against the exercise of an executive activity arising from the operation of s 61 of the Constitution, it would be plainly invalid for the reasons given by Dixon J in West v Commissioner of Taxation (NSW) (1937) 56 CLR 657 at 681 - 682. On the other hand, a general law that merely regulates the manner or mode of performing an activity which a servant or agent of the Commonwealth carries out in the course of executing functions and duties arising from the operation of s 61 of the Constitution is unlikely to constitute an infringement of those extraordinary capacities or powers of the Commonwealth to which I have referred. Such laws are to be contrasted with State laws that purport to bind the Commonwealth itself in exercising the capacities and powers conferred by s 61 of the Constitution alone or in conjunction with other powers of the Commonwealth. State laws purporting to have that effect can only operate as interpretation clauses. They show that the State law is intended to apply to the Commonwealth. However, they can do so only to the extent that the Commonwealth submits to the law by express words or conduct or by inference from its silence. But that is all.
42 The issue in these proceedings is whether, in light of the judgment in Re Residential Tenancies Tribunal , the application of s 106 impairs or interferes with the executive capacities of the Commonwealth, or whether it merely regulates the exercise of those capacities. The Commonwealth submitted that s 106 does interfere with the capacities of the Commonwealth. The Commonwealth pointed out that s 106 confers a broad discretion on the Commission to modify a transaction entered into by the Commonwealth and to impose legal consequences where previously there had been none. It was submitted that s 106 was not merely a law which regulated transactions entered into by the Commonwealth.
43 It has been suggested that the distinction between "capacity" and the "exercise of capacity" suggests "that the Commonwealth and its instrumentalities are subject to State laws of general application, such as planning and environmental laws, and laws relating to employment such as anti-discrimination legislation and even occupational health and safety law": see G Williams, Labour Law and the Constitution (Sydney, The Federation Press, 1999) at p21. Mescher in his article "Whither Commonwealth Immunity" (1998) 17 Australian Bar Review 23 also observed that, as a result of the decision in Re Residential Tenancies Tribunal , the general principle of total immunity of the Commonwealth from State laws has been jettisoned. Mescher continues (at 40):
At a practical level, the proposition extracted from a majority of the court is Re Residential Tenancies Tribunal would not be easy to apply. It is, in many ways, not unlike the "affected by" doctrine which had its logistical ( sic ) problems even in pre- Cigamatic days. A provision of a state law which affects the capacities of the Commonwealth executive rather than one which, via a process of statutory construction, regulates activities engaged in by the Crown and its subjects, is a difficult distinction to draw. State legislation rarely, if ever, expressly state "This Act is intended to affect the capacity of the Commonwealth executive". Where the line is to be drawn between state laws which regulate activities and, as a matter of construction, extend to the Crown in right of the Commonwealth, and laws which affect the capacity of the Commonwealth executive is, to say the least, difficult to ascertain.
44 The nature of the jurisdiction of the Court under s 106 and the relief thereby available was authoritatively considered in the Full Bench judgment in Beahan v Bush Boake Allen Australia Limited (1999) 47 NSWLR 648 at 679 - 685; (1999) 93 IR 1 at 28 - 35. The analysis concluded with the following epitome:
What emerges from the above authorities, we think, is the now settled view that s.106 (as with the previous s.88F of the 1940 Act and s.275 of the 1991 Act) is directed to an impugned contract of employment, whether existing or terminated, as to the fairness of its express or implied terms. Such unfairness will depend upon the facts of each particular case by focusing attention on the contractual relationship between a particular employer and employee and where the unfairness may arise from the terms of the contract itself, the surrounding circumstances and/or the manner of performance or operation of the contract. The section, we emphasise, is not concerned with re-establishing an employment relationship which has ended nor with compensating an employee for the loss of his employment contract. In other words, the section is properly concerned with the fairness of the terms of a contract of employment in its various respects and, if relevantly found to be unfair, to provide remedial relief by avoiding or varying the terms of that contract and to order the payment of money in connection with any contract so avoided or varied as is considered just in the circumstances of the case.
45 The nature of the orders which might be made for the payment of money in connection with the contract or arrangement avoided or varied, as Barwick CJ said in Brown v Rezitis (1970) 127 CLR 157 at 164, "will of necessity cover a wide field" and "the power to order the payment of money is not limited to the making of an order for the payment of money by one of the parties to the contract or arrangement varied or avoided": Brown v Rezitis at 164 - 165; Visalli v Southwell (1988) 12 NSWLR 502 at 511. The power, as with the section in its entirety, is not to be construed narrowly and permits, in an appropriate case, money orders to be made as between respondents, and the power to make monetary orders may be exercised at a subsequent stage some time after the relevant contract or arrangement has been dealt with: Bush Boake at 13; Hoffman v Industrial Commission of New South Wales (1990) 33 IR 139 at 142.
46 However, in our opinion s 106, to the extent that it may permit variation or avoidance of the arrangement pleaded by the applicant, so far as it existed between the Commonwealth and himself, or at least so far as there is presently evidence of it in these proceedings, could not be said to derogate impermissibly from the Commonwealth's legitimate immunity from the reach of State legislative power. It is relevant to this aspect of our consideration to refer to the nature or subject matter of the relationship or dealings between the applicant and the Commonwealth. It was limited to the passing on of information in his possession; that is, the provision of information, including information as to political and military developments, which became available to him in the course of his employment with Egis. The information was provided to both Egis and the Commonwealth.
47 As was observed in the judgment of the High Court in A v Hayden (1984) 156 CLR 532, the passing on of information in one's possession is what any citizen might ordinarily do. Gibbs CJ said in that case, at 543:
Of course any contract which obliges the government or an agency of the government to take or refrain from taking action of any kind operates to some extent to fetter executive power, but, as Aickin J said in Ansett Transport Industries (Operations) Pty. Ltd. v. The Commonwealth (1977) 139 CLR 54, at p 113, "It is plain that even without statutory authority the Commonwealth in the exercise of its executive power may enter into binding contracts affecting its future action". The suggestion made by Rowlatt J in Rederiaktiebolaget Amphitrite v. The King [1921] 3 KB 500, at p 503, that the government cannot by contract fetter its executive action in matters which concern the welfare of the State is too wide. It is true that speaking generally the government cannot by contract disable itself or its officers from performing a duty cast on it by statute or from freely exercising a statutory power or discretion: see per Mason J in Ansett Transport Industries (Operations) Pty. Ltd. v. The Commonwealth , at pp 74 - 75. The same principle may apply when the Crown is entrusted with powers under the prerogative: Commissioners of Crown Lands v. Page [1960] 2 QB 274, at p 291. However this principle has no application to the present case, where there exists no relevant power or duty granted or imposed by statute or available under the prerogative, and the Commonwealth seeks to do what any citizen might ordinarily do, i.e., pass on information in its possession.
48 This passage has another importance. It demonstrates that, outside the area of duties imposed by statute, or those involving the exercise of a statutory discretion or a prerogative power, the Commonwealth may enter into contracts affecting its future conduct. The corollary is that such contracts are enforceable against the Commonwealth. Similarly, where the Commonwealth is in a legal relationship with another person, that is a relationship which gives rise to legal rights and duties inter se , and whether or not the relationship arises from contract, conduct of the Commonwealth may lead to binding estoppels against it in favour of the other party: see Commonwealth of Australia v Verwayen (1990) 170 CLR 394 at, for example, 454 - 456.
49 The Federation of Australia is a complex legal and social polity. The Constitution in its terms displays the continuing recognition of this situation, subject of course to the role of the Courts, particularly the High Court, in the interpretation and evolution of the scope of the Constitution. The Constitution , in ss 106 to 108 ensured the saving of State Constitutions and State laws, and the saving of the powers of their Parliaments. Less explicitly perhaps, the recognition of the role of the States was emphasised by the fact the powers provided to the Commonwealth by the Constitution were not plenary but rather enumerated or specified, both as to powers exercised concurrently with the States (for example, under s 51 of the Constitution ) and those exercised exclusively by the Commonwealth (such as ss 52 and 122). Indeed, the importance of s 109 of the Constitution may only be fully appreciated in terms of its inter-relationship with the constitutional provisions as to concurrent enumerated powers and those which preserve the roles and laws of the States. As Latham CJ said in Uther at 521:
The Commonwealth of Australia was not born into a vacuum. It came into existence within a system of law already established. To much of that law the Commonwealth is necessarily subject; for example, the Commonwealth has no general power to legislate with respect to the law of property, the law of contract, the law of tort. In relation to those subjects, speaking generally, it lives and moves and has its being within a system of law which consists of the common law (in the widest sense) and the statute law of the various States.