25+ years of experience in accounting and tax in Thailand
Specialist in international tax, M&A, and supply chain restructuring
Internationally recognized as a leading practitioner in tax controversy
Bangkok
@alvarezmarsal
LinkedIn
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Korneeka Koonachoak is a Managing Director with Alvarez & Marsal Tax in Bangkok. She specializes in international tax with respect to inbound and outbound investments, M&A, supply chain restructuring, corporate income tax, cross-border planning, and tax compliance and controversy.
With more than 25 years of experience in accounting and tax, including four years in New York, Ms. Koonachoak has helped multinational companies to solve complex, multi-disciplined tax issues. Her work has included cross-border M&A, supply chain restructuring within group companies, tax controversy management, and advanced pricing agreement negotiations with the Thai tax authorities.
Notably, Ms. Koonachoak is responsible for international tax, M&A, and supply chain restructuring. She has worked with clients across various industries, including consumer products, pharmaceuticals, chemicals, automotives, alternative energy, software and information technology, and hospitality businesses.
Prior to joining A&M, Ms. Koonachoak spent 11 years with Deloitte in Thailand, where she most recently served as Tax Partner. In this role, she was responsible for international tax, M&A, and supply chain restructuring.
Ms. Koonachoak earned a bachelor’s degree in accountancy from Chulalongkorn University, Thailand, and a master’s degree in professional accountancy from Indiana University, U.S. Since 2018, she has been recognized as a leading practitioner in tax controversy and among women in tax by the International Tax Review.
Alvarez & Marsal recently hosted an engaging and practical session tailored for tax, finance, and trade professionals in the pharmaceutical industry. This first edition of our Thailand Tax Talk: Industry Series explored how tax leaders in the pharma sector can respond to increasing regulatory pressure, operational complexity, and cross-border trade disruption.
Explore how the Thai Revenue Department is enhancing tax audits and revenue collection through AI, digital transformation, and targeted strategies for fiscal year 2026.
Get Q3 2025 updates on ASC 740, IAS 12, OECD Pillar Two, and US tax rules like ASU 2023-09 reshaping global tax accounting and financial reporting practices.
The Supreme Court’s affirmation of the Delhi High Court ruling in the Progress Rail case provides important clarity on Permanent Establishment standards in India.
The decision reinforces key principles on control, core functions, agency thresholds, and profit attribution.
It further underscores that arm’s-length remuneration to Indian subsidiaries precludes additional attribution.
A significant development for multinational enterprises evaluating their India-linked operating models.
