Senate Report Puts Tether’s Iran-Linked USDT Freezes Under Fresh Scrutiny

Senate Permanent Subcommittee on Investigations Democrats on Sept. 28 called for Treasury Department and Justice Department investigations into Tether's sanctions and anti-money-laundering compliance, after a review found USDT dominated activity among Iran- and proxy-linked sanctioned crypto wallets.

The lawmakers' report examined 846 wallets and found that 84% transacted exclusively or nearly exclusively in USDT. Tether said separately that it had supported freezes of approximately $550 million across wallets identified by U.S. authorities as tied to Iran's Central Bank and Iranian sanctions networks during 2026.

Senate Democrats seek Treasury and DOJ investigation of Tether

The Democratic staff report places the stablecoin issuer at the center of an alleged crypto-based shadow-banking network connected to Iran and its proxies. The subcommittee's Democrats urged Treasury and DOJ to examine whether Tether's controls met sanctions and anti-money-laundering obligations.

The findings were released by Sen. Richard Blumenthal, the panel's ranking Democrat. In its announcement, the subcommittee said its analysis found USDT was the principal token used by the sanctioned wallet group. Reuters independently reported the review's 846-wallet scope and 84% USDT figure.

Report alleges delayed USDT wallet freezes enabled Iran's network

The report's central allegation is not simply that sanctioned actors used USDT, but that Tether repeatedly failed to freeze illicit wallets quickly enough. According to the Senate report, those failures helped create conditions for Iran's crypto-based shadow-banking network to expand.

It cited instances in which funds continued moving after wallet designations. The report does not establish an enforcement finding against Tether; rather, it seeks federal scrutiny of the company's sanctions and anti-money-laundering practices.

Tether cites nearly $550 million in Iran-linked freezes

Tether disputed the implication that it had failed to act against Iran-linked activity, citing enforcement support it says it provided during 2026. The company said actions involving USDT helped freeze about $550 million in wallets U.S. authorities identified as connected to Iran’s Central Bank and Iranian sanctions networks, including more than $344 million frozen in April and more than $130 million in July, according to Tether’s Sept. 28 statement. The competing accounts leave the timing and adequacy of wallet freezes as the central issue raised by Senate Democrats’ request for review.

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