Johanne Hague

Corporate and commercial

Tax advisory and tax controversy

Banking and finance

Mergers and acquisitions

Insolvency

Fintech

Investment funds

Johanne is the founder of CMS Prism in association with CMS, a tax lawyer practising at the Mauritian bar. Johanne is also qualified as a solicitor of England & Wales since 2007 and has previously worked for many years in London, at magic circle law firm Linklaters LLP and in-house at US investment bank JPMorgan Chase Bank.

Johanne’s passion for tax is translated into her dedication in providing the best representation to her clients in all aspects of revenue law.

She has significant experience on tax legislation in the UK, Mauritius and a number of African countries and routinely advises multinational and domestic clients on their contentious and transactional tax issues. She regularly assists clients in connection with audits, investigations and assessments by the Mauritius Revenue Authority and appears for her clients before the Assessment Review Committee and the Supreme Court of Mauritius on tax-related matters.

• Admitted to the Bar of Mauritius

• Admitted to the Law Society of England & Wales

Johanne believes that providing first class client services can only be achieved by coupling deep expertise in the relevant area of law with genuine dedication to serve the client’s best interests. These core values are at the forefront of her daily practice. She considers that one of the ways of achieving this is by adopting an innovative, holistic and flexible approach to law. This includes mentoring and supporting CMS Prism’s associates and other young lawyers in the legal profession and incorporating mindfulness in the practice of her vocation.

Johanne is ranked in the Global Guide 2024 published by Chambers and Partners. She has been rated as highly regarded practitioner in general corporate tax by ITR World Tax.

She sits on the tax committee of Mauritius Finance, an industry body for the promotion of financial services in Mauritius.

Johanne, as founder and sole partner of CMS Prism in association with CMS has steered the law firm to the forefront of the Mauritius legal landscape within just five years since its inception. Prism Chambers is the only law firm in Mauritius specialising in tax law and has garnered distinguished recognitions from Legal500, Chambers and Partners, and ITR World Tax, solidifying its position as a leading firm in the region.

Highly Regarded Practitioner in General Corporate Tax in Mauritius

ITR World Tax Rankings

2025

Highly Recommended in Corporate & Commercial in Global Guide Rankings in Mauritius

Chambers and Partners

2024