BOI General Investment Promotion (Activity Groups A1+/A1/A2/A3/A4/B)

BOI General Investment Promotion

Funds foreign and domestic investment projects in Thailand through promotional incentives.

Thailand's Board of Investment (BOI) General Investment Promotion program is the country's primary vehicle for attracting foreign and domestic capital investment, offering corporate income tax (CIT) exemptions, import duty waivers, and non-tax privileges to companies operating in officially promoted activity categories. Projects are classified into five incentive groups based on technology level and strategic importance: A1+ (semiconductors, deep-tech) receives 10–13 years CIT exemption with no cap on exempt income; A1 and A2 (high-tech and important technology activities) receive up to 8 years with no cap; A3 receives 5 years; A4 receives 3 years; and Group B receives non-tax incentives only (land ownership rights, import duty exemptions on machinery, work permit facilitation). Additional CIT extensions of up to 2 years are available for projects in decentralized provinces or special economic zones, including the Eastern Economic Corridor (Rayong, Chonburi, Chachoengsao).

Applications are accepted year-round via the e-Investment Promotion digital system, with BOI promotion certificates issued within 10 working days of complete document submission. Minimum capital investment is THB 1 million, excluding land and working capital; projects exceeding THB 2 billion require a feasibility study; and the debt-to-equity ratio must not exceed 3:1 for new projects. Manufacturing companies with 100 or more employees must maintain at least 70% Thai workforce. Foreign companies may hold 100% ownership in all promoted sectors without a Thai partner requirement. The 2025 SME package extended CIT exemptions from 3 to 5 years for eligible companies and raised the exemption cap to 100% of investment value, with direct cash subsidies of 30–50% of investment (up to THB 100 million) available via the Competitiveness Enhancement Fund.

To qualify, companies should identify which BOI activity group covers their specific business activity, confirm the proposed investment amount meets thresholds, and prepare complete documentation for e-Investment Promotion submission. Activities in S-Curve priority industries — advanced electronics, electric vehicles, digital infrastructure, biotechnology, and smart agriculture — attract the highest incentive groups and the fastest review turnaround. The OECD Pillar Two adaptation underway for 2026 introduces a Qualified Refundable Tax Credit (QRTC) mechanism for large multinationals subject to the 15% global minimum tax; applicants in that category should consult BOI directly about how QRTC interacts with the standard CIT holiday.