Mr Jason Tan Jia Xin > Lee Hishammuddin Allen & Gledhill > Kuala Lumpur, Malaysia > Lawyer Profile

Lee Hishammuddin Allen & Gledhill

Work Department

Tax, SST & Customs




Jason’s primary area of practice is income tax and customs litigation, trade remedy investigations, tax and customs investigations and trade facilitation.

He has been involved in many of the largest income tax and customs disputes before all levels of Court on major points of tax law. The disputes involve issues on transfer pricing, withholding tax, income recognition, capital allowance, reinvestment allowance, double taxation agreements, deductibility of expenditure, excise valuation and customs procedures.

Jason also represents a sizeable number of manufacturers in local and foreign trade remedy investigations such as anti-dumping, safeguard duties, countervailing duties and anti-circumvention investigations.

He is also particularly active on issues relating to excise duty valuation, import and export controls, customs compliance, international trade regulations, customs valuation, sales and services tax and customs penalties.

Jason is a regular speaker on the tax scene on issues relating to income tax and customs. Jason was recently recognised as a “Leading Individual” by the Tax practice in The Legal 500 Asia-Pacific 2023 and was acknowledged as a “Future Star” in the Benchmark Litigation Asia Pacific 2023 rankings, and a “Rising Star of the Year” in the Benchmark Litigation Asia-Pacific Awards 2023. Jason is also ranked as “Up and Coming” in the tax practice by the Chambers Asia-Pacific 2023 rankings, as well as a “Notable Practitioner” by the Asialaw Profiles 2023/2024.

Jason has contributed to the Malaysian chapter of the Tax Disputes and Litigation Review (11th Edition, 2023), and to the Malaysian Chapter of the Lexology Getting the Deal Through – Tax Controversy 2024.


English, Malay, Mandarin


LLB (Hons), Cardiff University
Called to the Bar of England and Wales (Lincoln’s Inn)
Advocate & Solicitor of the High Court of Malaya

Lawyer Rankings

Malaysia > Tax

(Leading individuals)

Jason Tan Jia Xin – Lee Hishammuddin Allen & Gledhill

Recognised for its ‘technical knowledge and expertise’, the tax department at Lee Hishammuddin Allen & Gledhill is jointly led by expert Nitin Nadkarni and Jason Tan Jia Xin, who is praised for going ‘above and beyond’ on all tax matters. Well-versed in both the contentious and non-contentious aspects of the practice, the team is engaged by notable international clients to advise on high-value tax transactions, unfair trade practices, audits, and transfer pricing cases, in addition to indirect tax disputes. Ivy Yieng Ping Ling is noted for her ‘impressive breadth of tax knowledge’ and frequently appears before the Customs Appeal Tribunal and High Court, while senior associate Chris Toh Pei Roo focuses on direct tax disputes.