Siobhan Sellick

Director, Business Services and Taxation

Professional qualifications

Bachelor of Business, University of Technology Sydney
Fellow of the Institute of Certified Practising Accountants in Australia
Chartered Tax Adviser
Registered Tax Agent
Diploma of Tax Law, University of Sydney

Specialist areas

  • Tax planning, structuring and compliance
  • Risk Management and Asset Protection Strategies
  • Business structuring
  • High net wealth individuals
  • Management accounting
  • Estate and Succession planning


Siobhan has more than 20 years experience providing business advisory, taxation and private client services to a range of clients with a focus predominantly on High Net Individuals and Senior Executives.

She is currently a Director in the Business Services and Taxation division in Prosperity’s Sydney office, managing a team of professionals.

Prior to joining Prosperity, Siobhan was a Partner at a mid tier accounting firm and had also previously spent 15 years at Ernst & Young in their private client practice providing tax advisory, tax compliance and accounting services to privately owned businesses and high net wealth individuals including CEO’s, business owners, passive investors and professionals. Her clients ranged from high profile entertainers and sportspersons to CEO’s of large multi-national corporations, primary producers and privately owned businesses in the retail, aged care and professional services sectors.

While at Ernst & Young, Siobhan also spent time in their Middle Market corporate practice providing accounting and tax services to foreign companies establishing operations in Australia and other start-up companies.

Siobhan is focused on developing strong relationships with her clients and working together with key parties such as lawyers, bankers and financial advisors to provide a high quality service to all clients.