The BOT (Notification FX Supervisory Officer No. 38) now requires documents proving the source of foreign currency for each transaction of US$200,000 or more, for inbound payments such as goods/services, direct investment, securities or loans. Businesses pre-approved under Know Your Business (KYB), such as those with FX hedging or trade finance lines, or with at least one year of transaction history, are exempt. Gold-related inflows need documents at any amount. Cash FX over US$15,000 a day needs proof of import. Watchlist items (Thai property sold to foreigners, digital asset sales, other capital) need documents from US$200,000 with no KYB exemption. The rules take effect the day after Royal Gazette publication. Check with your bank now what documents it will ask for on large export receipts and gold or cash FX sales.