Mr. Loh began his professional career in 2000 when he joined as an audit associate with Tan & Loh Chartered Accountant (Parker Randall Loh). He  was later promoted to audit senior in 2001, audit supervisor in 2003, and audit manager in 2005. During his tenure with the firm, he was involved in both internal and external auditing for companies in various industries namely manufacturing,retail and wholesales, construction, property development, investment, engineering, used car, tourism etc.
In 2006, he set up his own firm, LSY & Associates, which provides professional services such as accounting, corporate secretarial, incorporation, liquidation, assurance, management consultancy, and financial planning. He later set up Total Coaching Sdn Bhd in 2015 and Total GS Taxation Sdn Bhd in 2016. Total Coaching Sdn Bhd is a company which provides full corporate advisory services including estate planning, wealth planning, mid-shore management, sales and services tax, risk planning and etc. Total GS Taxation Sdn Bhd is a license tax agent company.

He is an Independent Director of CWG Holdings Berhad and Alpha Ocean Resources Berhad since September
2019 and May 2020 respectively.

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