Simon Poh teaches taxation / advanced taxation courses to undergraduates and postgraduates at National University of Singapore (NUS) Business School since 2007.  He recently won the NUS Business School Teaching Excellence Award every year from 2020 to 2025.

Outside the academia, Simon has been a distinguished tax professional both in Singapore and the region, with more than three decades of experience in tax compliance and tax advisory work in the areas of corporate tax, individual tax and GST. This includes 9 years with the Inland Revenue Authority of Singapore, 3 years with reputable regional multinational corporations and more than 16 years with top international accounting firms.  His extensive experience includes GST tax advisory and risk management, international tax planning, transfer pricing, corporate restructuring, business acquisitions and mergers, tax due diligence reviews, expatriate tax planning, and advising clients on the tax implications of both inbound and outbound investments. 

Outside his teaching responsibilities Simon continues to be active in professional tax-related work. He served as Board Member of the Singapore Institute of Accredited Tax Professionals (SIATP) from January 2013 to March 2020. SIATP was renamed as Singapore Chartered Tax Professionals (SCTP) from April 2020. At SIATP/SCTP, Simon also served as Chairman of the SME Tax Committee from January 2012 to December 2022. After stepping down from the SME Tax Committee, Simon joined the Tax and Levies Committee of SCTP from January 2023. Since July 2021, he was appointed as a Member of the Income Tax Board of Review by the Ministry of Finance to hear appeals against tax assessments. Simon is also an Honorary Member of the Financial Planning Association of Singapore (FPAS) since 2011.  He is the author of Taxation in Singapore, first published in 2008, with the latest eBook edition published in July 2024.

Simon is a much sought-after speaker at numerous external tax seminars and he also conducts regular tax workshops for professional bodies like ISCA and ACCA, He is a regular contributor to local and foreign media and professional journals on current taxation issues. In addition, he currently serves, on a pro bono basis, as an Independent Director and Chairman of the Audit and Risk Committee of an established non-profit organisation since March 2023.