Bank of Thailand will require mandatory declaration of cash deposits exceeding 5 million Baht from Q4/2026 to control the underground economy.

This policy directly affects investors and entrepreneurs operating in Thailand, especially those with large-scale cash transactions. The mandatory declaration measures relate to cash flow and regulatory compliance, impacting transaction costs and cash management behavior of economic entities. The Baht may be affected by changes in cash flow within the banking system if mandatory declaration alters community deposit behavior.