One of the businesses promoted by BOI Thailand is trade and investment support offices. Thai Lawyers have helped a lot of foreign clients own their business 100% by obtaining the BOI certificate. This category is for those clients who provide services in advisory, engineering and technical, International business process outsourcing, etc. The main condition for Trade and Investment Support Offices is That the company must spend at least Baht 10 million in selling and administrative expenses per year for as long as it has the BOI promotion. If not, the BOI status will be cancelled.
Regarding the Selling and Administrative expenses, they include office personnel expenses, Electricity, water, internet and telephone expenses, air fares, travelling and accommodation, freight and transportation costs, rents, repair and maintenance, entertainment expense, commission, advertising, sales promotion, interest payments (both domestic and overseas), consultancy service fees, legal fee, accounting fee, audit fee, depreciation of assets and other selling and administrative expenses.
Note that salaries of the people you hire that are the direct cost of providing services to your client are in the category of cost of services (which is not to be counted in the Baht 10M selling and administrative expenses). Salaries of the managing director, secretary, and personnel in the accounting, IT and other administration side of the business are in the category of selling and administrative expenses.