New Zealand

“Accounting is not about managing the numbers, it is about managing the performance of the business and helping them grow.”

Sinclair Guo

Director, Business Advisory

Friendly and outgoing, Sinclair very much enjoys networking and believes this is the foundation to a rewarding relationship with potential and existing clients.

Sinclair was born in Liao Ning, China and moved to New Zealand in 2002. He is fluent in English and Mandarin.

Specialising in both personal and corporate tax matters, Sinclair has worked with a variety of clients including property developers, retailers and high-net-worth individuals.

He is committed to forming close partnerships with his clients and aiming to understand each client’s unique situation. Sinclair understands that every client has distinct requirements and prides himself on using his expertise to add value to each specific situation.

Sinclair’s personal motivation and desired contribution aligns directly with William Buck’s motto “Changing Lives”. Striving to provide extra value to his clients, he is keenly focused on delivering solutions and advice that create a positive impact.

The Facts:

Core Expertise

  • International Tax Structure
  • Compliance
  • Trusts
  • Technical Tax Advice


  • Bachelor of Commerce (Hons)
  • Member of CPA Australia
  • Member of New Zealand Institute of Chartered Accountants


  • Property development and construction
  • Inland Revenue investigations
  • Logistics
  • Manufacturing
  • Retailers/Wholesalers