David Thomas SC

David Thomas SC

Sydney, AU recognized lawyers icon Recognized in Best Lawyers since 2017
Sixth Floor Selborne/Wentworth Chambers

12 Best Lawyers awards

Awarded Practice Areas

Class Action Litigation Commercial Law Litigation Tax Law

Biography

David Thomas SC appears across Australia in a broad range of commercial and civil matters. He has a particular interest in class actions, regulatory, revenue and constitutional law. David appears at both trial and on appeal, including in the High Court.

Commercial and corporate law: Recent clients include HSBC on appeal in the Dick Smith litigation, IAL in the Greensill disputes, Channel Seven in claims against Cricket Australia, the Rinehart children in litigation against Gina Rinehart, NAB in proceedings concerning the Bank Bill Swap Rate and Brickworks in a landmark oppression action.

Class actions: Clients include National Australia Bank, Westpac, RBS, Suncorp, NULIS, Star Entertainment, Multiplex and subsidiaries of BHP. David has been appointed amicus by the Federal Court and NSW Supreme Court to provide submissions in novel matters.

Regulatory and civil penalty: David regularly acts for companies and individuals in proceedings brought by ASIC. Recent clients include Macquarie Bank, Westpac, Rio Tinto, MLC Nominees, NAB and MLC Insurance. David has also acted for ASIC and the ACCC respectively in High Court appeals concerning the operation of the MIS and cartel regimes. David represented NAB in the Banking Royal Commission.

Revenue law: David appears for both taxpayers and the Commissioner. Recent matters have involved Crown, Tabcorp, Tatts and Uber. David has also appeared for the Commissioner in High Court appeals concerning franking credits and charitable trusts, and for high net-worth individuals in income and tax residency matters.

Constitutional law: Notable matters include High Court challenges to the mining tax, carbon tax and the reform of parliamentary pension entitlements. He recently appeared in the first High Court challenge under s 90 of the Constitution since Ha.

Prior experience: David was awarded University Medals in both Law and History at the University of Sydney. David subsequently received a BCL (with Distinction) from the University of Oxford, while holding the Menzies Memorial Scholarship in Law. Prior to coming to the Bar, David was Associate to Justice Gummow at the High Court of Australia and a solicitor at Mallesons Stephen Jaques (now King & Wood Mallesons).

More information about David Thomas can be found at David Thomas SC - Sixth Floor Chambers / https://sixthfloor.com.au/barrister/david-thomas/ .

Sixth Floor Selborne/Wentworth Chambers

12 Best Lawyers awards

Overview

Client Testimonials

Awards & Focus

Lawyer of the Year Badge - 2026 - Class Action Litigation Lawyer of the Year Badge - 2022 - Class Action Litigation
Named "Lawyer of the Year" by Best Lawyers® for:
  • Class Action Litigation, Sydney, Australia (2026)
  • Class Action Litigation, Sydney, Australia (2022)
Recognized in The Best Lawyers in Australia 2027 for work in:
  • Class Action Litigation
  • Commercial Law
  • Litigation
  • Tax Law

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