Senate Report Alleges USDT Fuels Iran’s Sanctions Evasion
A new report from the U.S. Senate has identified Tether’s USDT stablecoin as a critical component of Iran’s efforts to circumvent international sanctions, detailing significant financial flows through the cryptocurrency. The findings, released by Democrats on the Senate Permanent Subcommittee on Investigations (PSI) on September 28, 2026, suggest that USDT has become a primary tool for Iran’s shadow banking network.
USDT Dominance in Sanctioned Wallets
The 28-page report, titled “Tethered to Terrorism: Crypto and Iran’s Shadow Banking Network,” analyzed 846 sanctioned crypto wallets linked to Iran. It found that 84% of these wallets transacted primarily in USDT. The reliance on the stablecoin is even more pronounced in wallets specifically connected to terrorism financing, where USDT accounted for 87% of transactions across 757 analyzed wallets.
Iran’s Central Bank Amasses USDT Reserves
According to the report, Iran’s Central Bank has accumulated at least $507 million in USDT. This reserve effectively provides the sanctioned nation with access to dollar-denominated liquidity without needing to engage with the traditional global banking system.
Oil Smugglers and Broader Crypto Activity
The investigation also revealed that sanctioned oil smugglers alone transferred over $603 million in USDT between 2021 and 2025. In 2025, Iran conducted an estimated $2 billion in cryptocurrency transactions, with USDT being the dominant currency. The report further indicated connections to Hezbollah, the Lebanese militant group designated as a terrorist organization by the U.S.
The subcommittee has forwarded its findings to the Treasury Department and the Justice Department for further investigation.
Tether’s Response and Senate Criticism
Tether has stated that it is cooperating with U.S. authorities and has frozen approximately $550 million in USDT associated with Iran in 2026, including $344 million in April and over $130 million in July.
However, the Senate report contends that these actions are insufficient and too slow. Investigators criticized Tether for delays in freezing certain wallets and for failing to proactively block others, suggesting that these lags created opportunities for funds to be moved before freezing orders could be implemented.
The report posits that USDT’s prevalence over alternatives like Bitcoin within Iranian networks stems from its combination of dollar stability, high liquidity, and widespread acceptance, which outweigh the perceived risk of eventual freezing for illicit actors.
Sanctions on Iranian Exchanges
In a related development, four Iranian crypto exchanges were sanctioned on June 2, 2026, for their alleged ties to the Islamic Revolutionary Guard Corps (IRGC) and involvement in money laundering.
Competitive Landscape Shifts
The scrutiny of Tether’s role could benefit competing stablecoins, such as USDC, issued by Circle. Circle has positioned itself as a compliance-focused alternative and has consistently emphasized its alignment with U.S. regulatory frameworks. The report linking USDT to terrorism financing sharpens this competitive distinction.
The report highlights an irony: the centralized control that makes USDT useful for regulators in tracking transactions is also the feature that draws criticism when that control is not exercised swiftly enough.
