What is the business partnership ratio for foreigners setting up a company in Thailand with a Thai spouse or partner?

In Thailand, the typical business partnership ratio for a foreigner is 49% foreign ownership and 51% Thai ownership, which applies unless the foreigner is a US citizen and has set up a company under the BoI (Board of Investment) scheme, or under the Amity Treaty allowing for 100% American ownership. In the case of a Thai spouse (Thai wife and foreign husband), the same partnership ratio generally applies unless specific conditions are met.