Chambers Asia-Pacific
Tax 2024 – Band 1 leading lawyer for 14 years
"It's always a pleasure to work with Sim Ho. He is knowledgeable and business-oriented."
Chambers notes that Sim Ho is a “highly regarded contentious tax lawyer in his own right” and "Sim Ho is an excellent tax lawyer", where his work covers both domestic Singapore and international tax dispute resolution.
"His advice is always spot on and his responses are very prompt," enthuses one client of his.
“He is considered as one of the best in handling tax disputes.” He has extensive experience representing clients in high-stakes cases.
Ong Sim Ho wins a lot of praise for his flexible approach and depth of knowledge in the tax area, with one client emphasising: “The most important thing is his technical understanding and how creative he is. No one in Singapore can cut through the issues like him. He is very, very strong.”
He is regarded as the leading expert for tax dispute cases and is frequently instructed on high stake litigations.
He has a reputation for being a smart and effective litigator. As one source noted, “he was technically sound, and offered strategic advice on a complex tax matter.”
He is praised for coming up with “very constructive ideas.” Sources also note that “his wealth of knowledge on precedents allows him to give an immediate response to any kind of question.”
Chambers High Net Worth
Private Wealth Law 2024 – Leading lawyer for 4 consecutive years
"Ong Sim Ho is more corporate tax focused and is extremely experienced."
Noted by Chambers that he has considerable experience advising high net worth clients on contentious and non-contentious trust and estate matters, and he is praised by sources for his tax expertise.
"Sim Ho is one of the leading practitioners in the tax and private wealth space. With his experience with the Inland Revenue Authority of Singapore and also commercial experience, he is able to provide well-balanced advice to clients that is both technically sound and practical."
"He is a seasoned tax practitioner and is a very well-regarded authority in this area."
Asia-Pacific Legal 500
Tax 2024 – Leading Individual for 15 years
Private Wealth and Family Law 2024 – Recommended lawyer for 4 consecutive years
Projects & Energy 2023 – Recommended lawyer for 4 consecutive years
Dispute Resolution 2020 – Recommended lawyer
“Ong Sim Ho is technically strong with practical solutions.”
“Ong Sim Ho has good commercial sense and gives practical advice.”
“Ong Sim Ho has a wealth of experience and does his best to be available when we call on him.”
“Ong Sim Ho is someone we are always relying on. He usually takes a novel approach in crafting his solutions and has not failed us in a single matter brought to him in more than 15 years.”
A “tax lynchpin” at the Singapore tax bar.
Ong Sim Ho is recommended for his “critical thinking” and “analytic skills”.
He is also commended for his “truly superior knowledge”.
He is "able to bring in his legal, finance, risk governance, and accounting perspectives to assist on various private client matter."
Asialaw Leading Lawyers
Tax 2024 – Ranked as Elite Practitioner for 6 consecutive years, previously also ranked Elite Practitioner of the practice for 4 consecutive years. Sim Ho was also previously ranked as the sole Leading lawyer.
“Excellent, Ong Sim Ho is commercially attuned and provides interesting perspectives to tax issues.”
Best Lawyers International: Singapore
Tax Law 2025 – Endorsed individual for 13 consecutive years
Trusts and Estates 2024 – Endorsed individual for 12 consecutive years
International Tax Review
Tax Controversy Leaders 2023 – Highly Regarded for 11 years
“Ong Sim Ho has demonstrated very good knowledge and in-depth understanding of the Singapore income tax regulations and has provided very concise and comprehensive analysis of our tax issue.”
Who’s Who Legal
Global Leader
Corporate Tax: Controversy 2022 – Recommended Lawyer for 2 consecutive years
Private Client 2023 – Recommended lawyer
National Leader
Southeast Asia: Corporate Tax 2024 – Recommended individual for 4 consecutive years
The Tax Director’s Handbook
Leading lawyer 2015 for 2 consecutive years