Who are CST

We are the Australian member firm of the CST International network.We deliver specialist tax advice and chartered accounting services to private clients, family groups and international enterprises.


Established in Sydney 1992 CST Tax Advisors has expanded internationally and now has offices in key expat centres in over 8 countries and 12 international cities including , Singapore, Hong Kong, Los Angeles and New York and London.

We are the only chartered accounting firm with specialist Australian advisors in based in Singapore and Hong Kong that are focused on private clients and private enterprises enabling us to deliver integrated cross border advice to clients investing in Asia or into Australia.

Our Mission Statement

CST Tax Advisors aims to provided expat individuals and international private enterprises in Expatland with integrated tax and accounting advice for their home country and the country in which they operate.


Our member firms are located in major international cities and we are therefore able to directly service our global clients in Expatland.

Our professional contacts mean that many cross-border business matters can easily be addressed. Our professional affiliations and professional relationships allow us to co-ordinate a solution to whatever professional tax or legal issue a client may have. This reduces many of the communication difficulties when an expatriate or business person is considering an international move.
To learn more about Expatland click here.

The History of CST

CST Tax Advisors was founded in 1992, by John Marcarian in Sydney when the business was known as Marcarian & Co. John’s brother Matthew joined the firm in the year 2000 and together John and Matthew specialised in international taxation law focusing their Chartered Accountancy skills in this area. From the early days John recognised that the private client tax market for Australian expatriates and Australian international businesses was a specialist market segment. In 2004 John established the office of CST Tax Advisors in Singapore. Today CST Tax Advisors has offices in Sydney, Singapore, London, Hong Kong, Los Angeles, New York, Atlanta and Tel Aviv.

John Marcarian

As John says

As John says

The beginning of the CST way was grounded in delivering quality services to the executive, private client or family business. I always believed that the relationship with the client was the foundation stone of the Firm and our obligation to maintain that relationship meant that we were not to be just about the chargeable hour and answering questions – but rather is a sense of obligation to go the extra mile to think about things that we ourselves would want done – if we were the client.

Our Key Value Proposition is to continue to provide expat individuals and international enterprises in ‘Expatland’ with integrated tax accounting and structuring advice for both their home markets and the international markets in which they operate. We do this by having empathy to their facts and circumstances and focussing on executing tax and business solutions.

We strongly believe that by focussing on clients living and working in ‘Expatland’ we can deliver on the above statement through our global brand and our united delivery platform.