US Warns Shippers Over Strait of Hormuz Sanctions for Paying Iran ‘Tolls’
US warns shippers that paying Iran for passage through the Strait of Hormuz could trigger sanctions, as a US naval blockade and ceasefire talks remain stalled.
US Treasury Issues Sanctions Alert
On May 1, 2026, the US Department of the Treasury’s Office of Foreign Assets Control (OFAC) issued an advisory warning shippers that payments to Iran for passage through the Strait of Hormuz risk sanctions.
The advisory said such payments may take many forms, including fiat currency, digital assets, offsets, informal swaps or other in-kind transfers, and that the sanctions exposure applies regardless of the payment mechanism.
The notice specifically flagged payments framed as charitable donations or routed through Iranian-affiliated organisations as potential conduits for regime financing.
OFAC reiterated that both the Iranian government and the Islamic Revolutionary Guard Corps remain subject to existing US sanctions, exposing intermediaries to substantial legal and commercial risk.
Naval Blockade Enters Third Week
The warning was issued as a US naval blockade of the Strait of Hormuz entered its third week, part of an intensified pressure campaign amid stalled ceasefire negotiations.
Iranian President Masoud Pezeshkian described the ongoing restrictions on the country’s ports as “intolerable,” according to state media reports, underscoring Tehran’s mounting frustration.
Commercial operators have reported operational disruptions in the region as naval escorts and inspections increase, complicating routine transit schedules.
Shipping firms face growing insurance and rerouting costs, and the US advisory is likely to intensify legal scrutiny of alternative arrangements that Iran may propose to keep commerce flowing.
Strategic Stakes for Global Energy Flows
The Strait of Hormuz is a vital maritime artery for global energy supplies, with roughly one-fifth of seaborne crude oil and liquefied natural gas transiting the waterway.
Any effective closure or throttling of that route would have immediate implications for global fuel markets and for energy-dependent economies in the Gulf, including the UAE.
The strategic leverage afforded by control of the strait has been a central factor since hostilities escalated after the initial US and Israeli strikes on Iran in late February.
Market observers say even the perception of constrained flows can trigger price volatility and accelerated hedging by major producers and consumers.
Iran’s Toll Proposals and Diplomatic Overtures
In previous rounds of diplomacy, Iran floated the idea of charging fees or tolls to vessels seeking passage as a potential bargaining chip, a proposition Washington has consistently rejected.
Iranian state media reported this week that Tehran had sent a fresh ceasefire proposal to the United States, an offer the White House declined to confirm publicly.
A White House spokesperson, Anna Kelly, told reporters that the administration does not detail private diplomatic exchanges and reiterated that the United States remains committed to preventing Iran from acquiring nuclear weapons.
Tehran’s new proposal has not been authenticated by US officials, and the contours of any offer — including whether it mentions maritime fees or safeguards for civilian shipping — remain unclear.
Commercial and Legal Risks for Shippers
OFAC warned that payments disguised as humanitarian contributions or routed through entities such as the Iranian Red Crescent Society, state-affiliated foundations, or embassy accounts could still expose payers to sanctions.
The advisory makes clear that commercial expediency will not be treated as a defense if transactions are found to benefit designated Iranian actors.
Shipping companies, freight forwarders and insurers are being advised to conduct enhanced due diligence and to consult compliance counsel before engaging with any novel payment schemes linked to Iranian authorities.
Industry sources say the advisory increases the likelihood that reputable insurers and banks will distance themselves from transactions tied to the strait, potentially leaving smaller operators with limited options.
Ceasefire Negotiations Remain Fragile
Both sides have largely curtailed offensive operations since a tentative pause in fighting on April 7, but negotiators acknowledge that the ceasefire framework has stalled in recent weeks.
US officials have repeatedly warned they could resume strikes if talks collapse, while Iranian diplomats say they remain open to negotiations if Washington alters what Tehran calls an “expansionist approach” and hostile rhetoric.
Iran’s foreign minister, Abbas Araghchi, said on Friday that Tehran remains willing to pursue diplomacy under modified US conduct, signaling room for engagement even as military posturing persists.
Analysts caution that unless both parties agree on a binding verification and enforcement mechanism, episodic violence and maritime friction are likely to continue.
The OFAC advisory and the naval blockade together mark a tightening of measures aimed at constraining Iran’s leverage in the Gulf while attempting to preserve safe passage for commerce under international law.
Market participants and Gulf governments will be watching closely for any diplomatic breakthrough that reduces the risk to shipping through the Strait of Hormuz and eases the broader security and economic pressures facing the region.
