Washington Makes the Toll the Crime
The United States has stopped arguing with Iran over who controls the Strait of Hormuz and started prosecuting the transaction itself. On May 27, the Treasury Department added Iran’s Persian Gulf Strait Authority to the Specially Designated Nationals list under Executive Order 13224, the counterterrorism authority reserved for entities that finance terror. The designation does not contest Tehran’s claim to administer the strait. It renders the act of buying passage a sanctionable offense, and in doing so it inverts the entire logic of the toll regime.
Iran’s position has been consistent since it closed the waterway at the outbreak of war on February 28. The only safe route, the Revolutionary Guard insists, runs through a corridor the IRGC has designated, and vessels that deviate face attack. The Persian Gulf Strait Authority was built to monetize that threat. Operators apply for permits through a dedicated channel, disclosing ownership, insurance, crew manifests, and cargo, and pay for the privilege of not being fired upon. Reported fees have reached two million dollars per transit, demanded in Bitcoin, Tether, or yuan, settled outside any banking system that a compliance officer could see. Israel-linked tonnage is banned outright. American-linked vessels and ships from countries Tehran deems hostile are restricted or denied. The scheme has no standing under the law of the sea, but it has standing at the muzzle of an IRGC gunboat, which for a shipowner is the only jurisdiction that matters in the moment of transit.
Treasury’s answer is to make the payment, rather than the passage, the thing that triggers liability. Office of Foreign Assets Control guidance issued on May 1, building on an April 28 advisory, established that toll payments to Iran or the IRGC for Hormuz transit are prohibited transactions for U.S. persons and expose non-U.S. firms to secondary sanctions. The May 27 designation hardened that warning into an enforcement instrument. The construction is deliberately airtight as to form. A prohibited payment is not only a wire or a cash transfer. It is a digital asset, an offset, an informal swap, an in-kind arrangement, a nominally charitable donation routed through the Iranian Red Crescent or Bonyad Mostazafan. The regulation anticipates every laundering path Tehran might offer and closes it in advance. There is no compliant way to pay for safe passage, because the payment is the violation regardless of its costume.
The reach of the rule is what gives it teeth. Liability does not stop at the shipowner who pays. Charterers, traders, financiers, insurers, and port agents can all be drawn in through a counterparty’s transit decision, whether or not they knew a toll was paid, whether or not they touched the funds. A non-U.S. bank that clears a related transaction faces secondary exposure. An insurer underwriting a vessel that bought its way through the corridor has a problem it may not discover until OFAC does. The opacity that makes the toll attractive to Tehran, crypto and yuan channels that never surface in a standard compliance trail, is the same opacity that makes every downstream party unable to certify it stayed clean. The sanction does not merely forbid the deal. It poisons the commercial water around it.
This is the coherent endgame of a pressure campaign that already includes a naval blockade and the Economic Fury sanctions architecture. Treasury Secretary Scott Bessent framed the designation as evidence the regime is desperate for cash, and the framing is accurate to the strategy. J.P. Morgan has estimated that an unobstructed Hormuz toll could yield Iran seventy to ninety billion dollars a year. Washington has concluded that the most efficient way to deny that revenue is not to clear the strait ship by ship but to make every potential payer a sanctions risk to itself. Force opens a lane for an afternoon. A prohibition that travels with the cargo, the charter, and the insurance certificate follows the vessel everywhere it docks.
The strait will not normalize on the strength of a designation. Traffic remains far below prewar levels, and it will stay there until owners receive credible guarantees on mine clearance, freedom of navigation, and insurable risk. But Tehran built the Persian Gulf Strait Authority to convert a chokehold into an annuity, and the United States has now ensured that the annuity cannot be collected without making the payer a pariah. Iran can still close the strait. What it can no longer do is get paid to open it.