Ong Ken Loon

Ken Loon has worked on a number of tax litigation cases that have led to landmark case law, including:

1. AQQ v Comptroller of Income Tax [2011] SGITBR 1 in which she appealed against the decision of the Income Tax Board of Review.


2. Lai Ling Wan (alias Lai Lily) v Commissioner of Stamp Duties [2011] 4 SLR 845 in which she successfully represented the appellant in the High Court in overturning the position taken by the Commissioner of Stamp Duties in his administrative circular on multiple property purchases.


3. Comptroller of Income Tax v MT [2006] 3 SLR(R) 688 in which she successfully represented a  ship owner before the Income Tax Board of Review and the High Court in tax exemption on the bareboat charter fees of a Singapore-registered ship.


4. First DCS Pte Ltd v. Chief Assessor and Comptroller of Property Tax [2007] 3 SLR 326; Chief Assessor and Another v First DCS Pte Ltd [2008] 2 SLR 724 in which she represented the Chief Assessor before the High Court and Court of Appeal in the assessment of pipelines running through land owned by third parties.

Chambers Asia-Pacific
Tax 2021 – Leading lawyer for 7 consecutive years

“very practical, very smart and absolutely amazing.”

“She is very solution-driven and extremely diligent in her response and advice.”

She is sought after for her depth of experience in handling tax disputes initiated by the tax authorities. "She is a lawyer I would go to for technical matters." 

Peers note her ability in tax litigation, while a client notes "her advice is very clear and understandable." 

Interviewees describe her as “technically strong” and praised her ability to “empathise with clients’ needs.”

Sources describe Ken Loon as "responsive, on the ball and very sound" and "very calm and composed: when she's in court, she clearly knows what she's doing."

Clients also praise Ken Loon for her pragmatic approach, stating: "We have been given clear advice and provided with support."

Another market source was similarly impressed, describing her as "commercially savvy and very prompt."

Asia-Pacific Legal 500 
Tax 2021 – Hall of Fame for 2 consecutive years, also the sole lawyer to be recognised in the Singapore chapter for Tax
Previously a Leading Individual for 9 consecutive years

Private Wealth 2021 – Recommended Lawyer for 4 years

A client commended Ken Loon for her “strong technical skills.”

Ong Ken Loon is a "go-to person for any tax dispute work" and particularly rated for her "professionalism and knowledge".

Asialaw Leading Lawyers
Tax 2021 – Distinguished Practitioner for 2 consecutive years

Clients describe Ken Loon as “very knowledgeable” and she has “calm hands.”

International Tax Review World Tax
Tax Controversy Leaders 2021 – Highly Regarded for 8 consecutive years
Women in Tax Leaders 2021 – Highly Regarded for 6 consecutive years

“Well-respected specialist in tax dispute resolution and regularly represents clients in tax tribunals and courts.”

Best Lawyers International: Singapore
Tax Law 2022 – Endorsed individual for 3 consecutive years
Trusts and Estates 2022 – Endorsed individual for 3 consecutive years

Asia Women In Business Law Awards
Singled out as the most outstanding practitioner in the field of Tax Dispute Resolution in 2019

Asia Legal Awards
Tax Lawyer of the Year 2018

Singapore Business Review
Singapore’s 40 most influential lawyers aged 40 and under in 2015 – Listed lawyer

Practical Law Company Which Lawyer?
Private Client 2012 – Recommended lawyer for 3 consecutive years

• Member, Law Society of Singapore
• Member, Singapore Academy of Law
• Member, Criminal Law Advisory Committee (Hearing)
• Member, International Fiscal Association, Singapore Branch
• Member, Singapore International Chamber of Commerce, Tax Interest Policy Group