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Firm history

The Thai firm

Phya Jaiyos SompatiDeloitte Touche Tohmatsu Jaiyos is the Thai practice of Deloitte Touche Tohmatsu. Our Thai practice was established by  Phya Jaiyos Sompati who was the first Thai to qualify as a Chartered Accountant (England & Wales) in 1919.  After a distinguished career in Thailand’s Ministry of Finance, including an appointment as the Minister of Finance (1935-1938), he resigned from government service at an early age and founded the firm, Jaiyos & Co., on 23 January 1939.  At the same time, he was asked by the Ministry of Education to set up the School of Commerce and Accountancy at Chulalongkorn University, Thailand’s oldest university and recognised as the country’s premier university.  He was also an architect in the drafting of the Auditors Legislation in Thailand.

Jaiyos & Co., became a member of the Deloitte Touche Tohmatsu global network in 1977.  In 1997, the firm changed its name to Deloitte Touche Tohmatsu Jaiyos – a name reflecting its proud Thai origins and growing international capabilities.

Deloitte Touche Tohmatsu Jaiyos has been proudly serving clients in Thailand for over 72 years. We have a long history of assisting local and international companies with their business needs. 

Today, we have a team of 50 Thai and international partners and over 800 client services and support staff.  

Our specialists combine technical expertise and industry knowledge to deliver consistent quality services through a global strategy executed locally to over 1,000 clients nationwide.


The Global firm

Our firm owes its existence to leaders in our profession who, from the beginning of their professional careers, recognized the importance of a worldwide practice.    William Welch Deloitte George A. Touche, and   Admiral Nobuzo Tohmatsu, all leaders of their profession, professed the ideals of quality and integrity to which our firm is committed to upholding today.