Roughly one-fifth of the world’s oil supply squeezes through a narrow channel between Iran and Oman every day. Now Iran wants to charge for the privilege of passing through it.
Tehran has established a new government body called the Persian Gulf Strait Authority, tasked with vetting and approving every vessel that transits the Strait of Hormuz and collecting fees from those that do. The authority has already begun distributing application forms to ships, requiring them to submit operational details before passage is granted, according to reporting by the Associated Press citing Lloyd’s List Intelligence, a leading maritime data provider.
The U.S. government responded within days. The Treasury Department’s Office of Foreign Assets Control published an advisory titled “Sanctions Risks of Iranian Demands for Strait of Hormuz Passage,” warning that any company, American or foreign, that pays Iran’s tolls could face sanctions enforcement. The alert specified that payments in fiat currency, digital assets, or in-kind offsets all carry the same legal risk.
A chokepoint with no easy alternative
The Strait of Hormuz is only about 21 miles wide at its narrowest point, and the shipping lanes that tankers actually use are far tighter. According to the U.S. Energy Information Administration, approximately 20 to 21 million barrels of oil and petroleum liquids pass through the strait each day, making it the single most important bottleneck in global energy trade. Qatar, the world’s largest exporter of liquefied natural gas, also ships virtually all of its LNG cargoes through the same corridor.
There is no comparable alternative. Saudi Arabia and the United Arab Emirates operate pipelines that can bypass the strait for a fraction of their output, but most producers in the Persian Gulf have no other route to open water. That geographic reality gives Iran enormous leverage and makes any new cost or delay at Hormuz a problem that cascades far beyond the shipping industry.
From informal demands to institutional toll collection
The new authority did not appear out of nowhere. Iran had already been demanding transit fees from some vessels passing through the strait, a practice that predated the formal creation of the agency, according to AP and Lloyd’s List reporting. Those earlier demands were sporadic and inconsistent, though no specific amounts, dates, or vessel names have been disclosed in publicly available accounts. The lack of granular detail means the scale and frequency of those pre-agency charges remain difficult to verify independently.
What changed is the bureaucratic architecture. By creating a named government body with application forms and an approval process, Tehran is signaling that it intends to make toll collection a permanent, institutionalized feature of Hormuz transit. Iranian officials have framed the effort as a matter of sovereignty and maritime safety, and Iran communicated what it described as precautionary measures to the International Maritime Organization, according to AP reporting. However, the IMO has not publicly confirmed receipt of or responded to those communications, and no direct IMO document or statement on the matter has been linked in available reporting as of June 2026.
No official Iranian government decree detailing the authority’s internal structure, bylaws, or fee schedules has surfaced in publicly available reporting as of June 2026.
The broader geopolitical backdrop
The timing of the new authority matters. U.S.-Iran tensions have been elevated throughout the spring of 2026, with Washington maintaining its “maximum pressure” sanctions campaign and Tehran pushing back on multiple fronts. The creation of a formal toll-collection body at Hormuz fits a pattern in which Iran uses its geographic position to assert leverage when it feels squeezed economically or diplomatically. The move also comes as global energy markets remain sensitive to supply disruptions, giving any friction at the strait outsized influence on oil and gas prices.
No shipowner, trading house, or industry group has gone on the record describing how the new requirements have affected their operations. That silence itself is telling: companies with vessels transiting Hormuz face legal exposure on both sides and have strong incentives to avoid public comment. Without named sources or concrete case studies, the on-the-ground impact of the toll regime remains difficult to assess from the outside.
The sanctions trap facing shipowners
The OFAC advisory is the strongest piece of primary evidence in this story, and it creates an immediate dilemma for every shipping company, insurer, and cargo owner with vessels transiting Hormuz.
U.S. sanctions on Iran are among the most extensive in the world. Any payment routed to an Iranian government entity, whether denominated in dollars, euros, cryptocurrency, or structured as a barter arrangement, could trigger enforcement actions under existing sanctions law. The OFAC alert effectively puts the global shipping industry on notice: comply with Iran’s toll regime and you risk being cut off from the U.S. financial system.
But refusing to pay carries its own dangers. Iran maintains a significant naval and Revolutionary Guard Corps presence in and around the strait. Disruptions to shipping in the area are not hypothetical. Vessels that decline to submit applications or pay fees could face delays, denied passage, or confrontations in waters where Iran has repeatedly demonstrated its willingness to seize or harass commercial ships.
That leaves shipowners caught between two enforcers: Iran on the water and the United States in the financial system.
Legal questions without clear answers
International law does not obviously support Iran’s position. The United Nations Convention on the Law of the Sea, specifically Articles 37 through 44, establishes the right of transit passage through straits used for international navigation. Under UNCLOS, ships and aircraft enjoy the right to continuous and expeditious transit, and coastal states bordering a strait cannot suspend or impede that passage.
Whether Iran can lawfully impose fees or require pre-approval for transit through Hormuz is an unresolved legal question. Tehran has not ratified UNCLOS, though it is a signatory, and Iranian officials have historically argued that the strait falls under their sovereign jurisdiction rather than the convention’s transit passage regime.
No major maritime nation has publicly taken a position on the legality of the new authority. European and Asian governments whose tankers depend on the strait have remained silent, at least in public, on whether their flagged vessels should comply with or resist the new requirements.
How higher Hormuz costs ripple through energy markets
Any sustained cost increase or disruption at the Strait of Hormuz ripples outward fast. Higher transit costs get absorbed first by shipowners, then passed to refiners, then to fuel distributors, and ultimately to consumers at the pump and in their utility bills.
If the toll regime drives some operators to reroute cargoes or avoid the strait entirely, the resulting shifts in shipping patterns could affect delivery times and freight rates across oil, LNG, and petrochemical markets. Even the uncertainty itself is a cost: insurers price risk, and the ambiguity of operating in a waterway where two governments are issuing contradictory directives will push war-risk premiums higher.
For now, the evidence confirms that Iran has built the institutional machinery to tax the world’s most critical oil chokepoint. The United States has made clear that cooperating with that machinery carries serious legal consequences. And the shipping companies caught in between are left navigating a strait that just became far more treacherous on paper than it ever was on the water.
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*This article was researched with the help of AI, with human editors creating the final content.
