The Bank of Thailand will announce a joint stance with banks and non-bank lenders on 10 Sep to block "grey money". From October, cash deposits or withdrawals of 5 million baht or more must state the source of funds. Gold bar purchases of 2 kg or more (about 10 million baht) must be reported by gold shops, though not banned. Cash withdrawals above 5 million baht fell 52% between Jan and Jun 2026. For a business that regularly moves large cash sums, expect bank questions on source of funds and keep clear sales and transfer records. Online-betting and USDT flows are also being tightened, so avoid unexplained transfers via crypto or card-cash services.