Who We Are

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

About Us

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Established in 1992 CST Tax Advisors has expanded internationally opening in Singapore in 2004. CST Tax Advisors now has offices in key centres including London, Singapore, Hong Kong, Los Angeles and New York. As the only firm of tax specialists and Chartered Accountants focused on Expatland we are able to provide unique insights to our clients.

CST Tax Advisors Singapore currently provides tax and accounting services to expatriates living and working in Singapore from all over the globe including Australia, the UK,Europe, the United States and other parts of Asia.

Our Mission Statement

CST Tax Advisors aims to provide 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.

Boon Tan

Boon joined CST in 2012 and was appointed a Principal of the Sydney practice in 2013 where he specialised in... LEARN MORE

John Marcarian

A specialist in global private client tax and international business expansion, John is a sought after speaker on tax and... LEARN MORE

The History of CST

CST Tax Advisors was founded in 1992, by John Marcarian. From the early days of the Firm it was recognised that the private client tax market for Australian expatriates and international businesses was a specialist market segment. Singapore proved to be a very popular destination for Australian expatriates and entrepreneurs given the close relationship between Australia and Singapore.

As a result CST Tax Advisors Singapore was established in 2004 and has become the leading international tax firm servicing private clients in Singapore. Our strong relationships with leading private banks, law and immigrations firms and trust companies enable us to ensure clients are also well advised in other areas. CST Tax Advisors now has offices in London, Sydney, Hong Kong, Singapore, Los Angeles, New York, Atlanta and Tel Aviv.


Tax advice provided the CST Way - the Australian way.

In today's ever changing world our Australian and international clients can take comfort in knowing that our Principals have the specialist skills to help on them on cross border Australian tax issues, helping them plan for changing family or business circumstances and giving them peace of mind and the confidence to move ahead with their dealings in Expatland.

CST has specialist advisors who work daily with their colleagues across Asia, the US and the United Kingdom to ensure your tax advisory and compliance needs are properly looked after.

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"Our Key Value Proposition is to provide Global Founders, Organisations Expanding to Singapore, Global Families and Organisations Employing Expats 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 focusing on executing tax and business solutions."

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.