Mr Sumet Mingmongkolmitr > Blumenthal Richter & Sumet Ltd > Bangkok, Thailand > Lawyer Profile

Blumenthal Richter & Sumet Ltd
Sumet Mingmongkolmitr photo

Work Department

Tax and Customs


Sumet is a Senior Partner and head of the firm’s Tax and Customs practice group. He specializes in legal services involving foreign investment, tax and customs as well as commercial matters in Thailand and the wider ASEAN region. He has represented multi-national companies in lobbying various Thai authorities on: foreign investment approvals and other insurance and regulatory matters; legal due diligence issues; structuring, negotiating and documenting international joint ventures; acquisitions; and obtaining Board of Investment (BOI) promotion for foreign companies doing business in Thailand among other areas. He has extensive knowledge of bilateral agreements entered into by the Thai government for the avoidance of double taxation, as well as the prevention of fiscal evasion with respect to taxes on income.


Sumet is widely regarded for his comprehensive understanding of the Thai tax appeals process and the application of the General Agreement on Tariffs and Trade (GATT), and in particular the provisions on valuations for customs purposes. Sumet’s expertise covers both local and international tax and customs law and he regularly advises on planning and other aspects of tax efficient structures for various commercial transactions, including business transfers and exchanges, trade agreements and resolving disputes with tax and customs authorities.


Thai and English.


Sumet is a member of the Law Society of Thailand and the Thai Bar Association.


He received his LL.B. and M.B.A. from Thailand’s prestigious Chulalongkorn University.

Lawyer Rankings

Thailand > Tax

Blumenthal Richter & Sumet Ltd advises corporates on income tax, VAT, custom duties, transactional tax structuring, and tax savings under international treaties. The real estate finance, pharmaceuticals, energy and automotive sectors are key areas of focus for the firm, as are private high-net-worth clients. Senior partner Sumet Mingmongkolmitr is a key contact for outbound transactions and foreign investment, and also has experience handling disputes in the Thai Tax Court.

Thailand > Corporate and M&A (including capital markets)

Blumenthal Richter & Sumet Ltd has a reputation for advising a variety of European and North American corporates on their investments in Thailand, specialising in the establishment of joint ventures between foreign and Thai companies. The practice group is jointly headed by Siripen Kulworakulpitak and Andreas C. Richter, who acts for a varied client base including governments, multinational corporations and high-net-worth individuals. Also recommended are Sumet Mingmongkolmitr, who advises on foreign investment approvals and cross-border structuring in addition to various regulatory matters, and Ittinant Suwanjutha, who has has an active corporate finance and property finance practice.