1 Firm

Founded in 2014, OSH is a tax law practice based in Singapore and headed by Ong Sim Ho, who is consistently top-rated in the tax arena by leading professional publications and praised for his unique and multi-disciplinary approach to tax issues. Formerly from top-tier Singapore law firms, our team is well-experienced in all areas of tax. Our substantive practice-focus is in tax dispute resolution and litigation, tax investigation and tax advisory matters. We have a significant following from oil and gas clients from South East Asia and the Middle East and we are particularly adept in advising on the structure and design of fiscal policies for national/state oil and gas companies.

Since opening our doors, we have attracted a strong mandate from our clients, which include a large local logistics and transport undertaking, a leading global marine and offshore engineering group, established local property developers, real estate investment trusts, a national oil company, a large Japanese corporation with a presence in Singapore, a global courier delivery services company, and a well known international chain of vacation resorts.

At OSH, we are committed to delivering top-notch tax legal advice and solutions by building on the strength of every lawyer and having a dedicated focus on areas of law in which we excel. We believe that being All here for you is the foundation to our success.

6 Lawyers

Having all come from top-tier Singapore law firms, the team is well-experienced in all areas of Singapore tax law with a substantive practice-focus in tax dispute resolution and litigation, tax investigation, and tax advisory matters.

S$360M TUM*

OSH is pleased to announce that as of 1st January 2017, the current actual tax assessment/liabilities under our active dispute management is at S$360M—a 20% increase since July 2016. We use TUM as an objective measure of our pole position in the tax dispute and litigation market. It denotes the total tax assessed and under objection currently advised and managed by the firm, excluding transaction values and trust assets. We are truly humbled by the cases entrusted to us.

*Taxes Under Management

We Just Work

By consistently delivering effective solutions that work for our clients, we are proud to be ranked by the following leading publications.
2017 Tax Controversy Leaders Guide: Ong Sim Ho
2017 Band 1 Leading Individual: Ong Sim Ho
2017 Recommended Lawyer: Ong Sim Ho, Yang Shi Yong, Seah Ching Ling
2017 Tax: Local Firm
2016 Leading Individual: Ong Sim Ho
2016 Recommended Lawyer: Ong Sim Ho, Yang Shi Yong
2016 Tax: Local Firm
2015 Top Leading Lawyer in Singapore
2014 Top Leading Lawyer in Singapore
2014 Ranked Band 1
2006-07 Leading Individual in Singapore Taxation
2005 Tax & Trust Firm of the Year
2003 Best in Tax