Mayfield Development Corporation Pty Ltd v NSW Port Operations Hold Co Pty Ltd (HCA)
High Court of Australia
Mayfield Development Corporation Pty Ltd v NSW Port Operations Hold Co Pty Ltd
[2026] HCA 12 (6 May 2026)
Chief Justice Gageler and Justices Gordon, Edelman, Gleeson and Beech-Jones
Focus: derivative crown immunity in context of competition law
Catchwords
Statutes − Construction − Derivative Crown immunity − Where State of New South Wales ("State") agreed Port Commitment Deeds ("PCDs") with first to third respondents ("NSW Ports") − Where PCDs required State to compensate NSW Ports if certain ports were not at full capacity and certain volume of containers diverted to other port − Where appellant alleged NSW Ports' entry into PCDs breached ss 45 and 45DA(1) of Competition and Consumer Act 2010 (Cth) ("CCA") − Whether ss 45 and 45DA(1) of CCA bound NSW Ports despite presumption of derivative Crown immunity.
Equity − Estoppel − Abuse of process − Where Australian Competition and Consumer Commission previously brought similar proceedings against NSW Ports ("ACCC Proceedings") − Where ACCC Proceedings dismissed − Where appellant intervened in ACCC Proceedings on limited basis − Whether appellant estopped from bringing these proceedings − Whether these proceedings constituted abuse of process.
Contract − Deed of release − Where appellant executed deed of release in favour of State − Where NSW Ports not mentioned in or party to deed − Whether deed of release barred claim against NSW Ports.
Words and phrases – "abuse of process", "capacity to contract", "Crown immunity", "deed of release", "derivative Crown immunity", "estoppel", "freedom to contract", "impairment of legal relations", "issue estoppel", "legal rights or interests", "presumption of legislative intention".
Competition and Consumer Act 2010 (Cth), ss 2A, 2B, 2C, 45, 45DA, 51
Ports Assets (Authorised Transactions) Act 2012 (NSW), ss 7, 25, Pt 2
Finding
Appeal allowed (unanimously). From the judgment summary:
“Mayfield commenced proceedings in the Federal Court of Australia against NSW Ports, alleging breaches of ss 45(2)(a)(ii), 45(2)(b)(ii) and 45DA(1) of the Competition and Consumer Act 2010 (Cth) ("the CCA"). In an earlier proceeding before the Federal Court, the Australian Competition and Consumer Commission ("the ACCC") had brought a similar claim against NSW Ports ("the ACCC Proceeding"). That claim failed at first instance and on appeal for reasons that included a determination that, on the proper construction of the CCA, by reason of derivative Crown immunity, s 45 of the CCA did not apply to the conduct of NSW Ports in respect of its entry into the PCDs. Mayfield was granted leave to intervene in the appeal in the ACCC Proceeding, but this leave was limited to the filing of written submissions.
The primary judge held that Mayfield's claim was not precluded either by the deed of release or by its intervention in the appeal in the ACCC Proceeding. However, the primary judge considered himself bound to follow the decision of the Full Court in the ACCC Proceeding that derivative Crown immunity was a complete answer to Mayfield's claims. The Full Court dismissed Mayfield's appeal.
The High Court unanimously held that Mayfield was not barred by the deed of release or estopped by reason of its limited involvement in the ACCC Proceeding from bringing this proceeding, nor was the proceeding an abuse of process.”
Commentary
Sar Katdare, Monica Jones, ‘Contracting with the Crown? They may be immune from competition law, but not you!’ (Johson | Winter | Slattery, 12 May 2026)