Thailand's central bank and securities regulator will jointly review large USDT transactions under a framework announced this week, with rules expected to take effect in the fourth quarter of 2026, BeIn Crypto reported Sunday.
The measures centre on a cash-deposit threshold. Customers depositing 5 million baht (~$150,000) or more will be required to document the source of funds, extending due diligence requirements already in place for withdrawals above the same level. Since April, cash withdrawals exceeding 5 million baht have required customers to provide a verified business reason and explain why an electronic transfer could not be used. The value of large cash withdrawals subsequently fell 35%, prompting officials to close the corresponding gap on the deposit side.
The Bank of Thailand is working directly with the Securities and Exchange Commission to examine unusually high-volume USDT trades, with a focus on identifying the ultimate beneficial owner behind transactions that may be structured to obscure ownership or bypass standard remittance channels.
Structural fixes
Governor Vitai Ratanakorn described the measures as structural rather than temporary. "The measures we are implementing are not short-term fixes," he said, BeIn Crypto reported, adding that they require multiple parallel strategies. The central bank is also weighing curbs on high-value banknote exchanges and tighter gold-trading oversight.
The USDT focus builds on concerns the Governor raised in January, when he noted that approximately 40% of USDT sellers on local platforms were foreign nationals — a demographic that, under current rules, should not be operating in Thailand's regulated digital-asset market. The formal regulatory status of USDT is not in question: Thailand's SEC added USDT and USDC to its list of permitted cryptocurrencies in March 2025, allowing licensed exchanges to use them as base trading pairs. The enforcement action targets how some participants are using the asset, not the asset itself.
USDT has become a recurring feature in regional money laundering investigations. The stablecoin's appeal in illicit finance is structural: it combines dollar liquidity with rapid, irreversible cross-border settlement, and transactions on the TRON network — where most USDT currently runs — are pseudonymous. Tether can freeze specific wallet addresses, including the 131 TRON wallets designated by the U.S. Treasury in July — a capability that Thai and other regional authorities have relied on in joint investigations.
Broader crackdown
Thailand's move is part of a wider tightening across Southeast Asia. Regulators in Singapore, Vietnam, and the Philippines have each taken steps to increase stablecoin oversight in the past 18 months, responding to the same laundering vectors. What Bangkok adds is a concrete audit mechanism targeting USDT specifically, with a fourth-quarter implementation timeline that will bring the rules into effect during a period of elevated regional capital flows.
The practical enforcement challenge is capacity. On-chain transaction monitoring requires analytical infrastructure that traditional financial intelligence units have had to build from scratch. The joint Bank of Thailand–SEC review process is designed to close that gap by combining blockchain analytics with conventional investigative methods — tracing off-ramps from digital asset platforms to bank accounts and identifying the natural persons behind wallet addresses.
