The Independent Regulatory Board for Auditors (IRBA), a statutory body established under the Auditing Profession Act 26 of 2005, prescribed various fees payable by registered auditors and tax practitioners for the 2020 and 2021 financial years. These included percentage-based assurance fees for Category C (low-risk) assurance work, tax practitioner fees, administration fees, above-inflation increases to annual renewal fees, and the withdrawal of a 50% fee concession previously granted to auditors over the age of 65. The fee prescriptions were published in Government Gazettes in 2019 and 2020. The East Rand Member District of Chartered Accountants, representing affected auditors, brought review applications under the Promotion of Administrative Justice Act 3 of 2000 (PAJA), alternatively under the principle of legality, challenging the Board’s authority to impose these fees and alleging procedural unfairness, irrationality, and ultra vires conduct. The High Court largely upheld the challenges and set aside the impugned decisions. IRBA appealed to the Supreme Court of Appeal.