The Strait of Hormuz — the 21-mile-wide chokepoint through which 17.8 million barrels of oil transit daily, representing roughly 20% of global oil supply — has effectively become a toll road. Tehran, in a move that has drawn little Western media attention but is reshaping global energy flows, is operating a de facto passage fee system that accepts only Chinese yuan, grants preferential access to Chinese and Indian carriers, and leaves Western-flagged vessels with no viable transit option.

How the System Works

Iran’s toll arrangement is not a formal, publicly announced policy. It operates through a network of intermediaries — primarily Kish Island-based trading companies with established relationships with the Islamic Revolutionary Guard Corps Navy (IRGCN), which controls Hormuz access. Here is the reported mechanics:

Vessel operators seeking Hormuz passage contact designated intermediaries, typically 72 to 96 hours in advance. A fee — estimated at $0.50 to $1.20 per barrel of cargo — is negotiated and paid in Chinese yuan via accounts held at Kunlun Bank, the Chinese bank that has historically processed Iran-China transactions outside the SWIFT system. Upon confirmation of payment, vessels receive safe passage coordinates and are escorted by IRGCN patrol boats through the strait.

Western carriers — those flagged under U.S., EU, or UK registry, or those insured by Lloyd’s of London and other Western P&I clubs — are systematically excluded from this arrangement. Their vessels face either direct interdiction or are simply never given passage coordinates, effectively blocking transit.

Who Gets Access: The China and India Preference

The arrangement creates a visible hierarchy. Chinese state-owned carriers — COSCO Shipping, China Merchants Energy Shipping — transit with the lowest friction and most favorable fee structures. Indian carriers, particularly those serving state-owned HPCL and IOC refineries, access a second tier with slightly higher fees but reliable passage.

This is not accidental. Both China and India have maintained energy trade with Iran throughout the sanctions era, and both have deepened those ties since the conflict began. China now purchases an estimated 1.6 million barrels per day of Iranian crude, typically at a 15-20% discount to Brent, making Iranian oil a critical cost advantage for Chinese refiners competing in the global petrochemicals market.

India’s position is more nuanced. New Delhi has historically balanced U.S. and Iran relationships carefully, and Indian refiners are now benefiting from both the discounted Iranian crude and the relative Hormuz access their carrier relationships provide. This dynamic is accelerating India’s de facto drift away from dollar-denominated energy trade, a trend that has significant long-term implications for U.S. financial dominance.

The Yuan Dimension: More Than Just Payment

The insistence on yuan payment is the most strategically significant element of Iran’s toll system. It is not merely a practical workaround to sanctions — it is the first large-scale, operationally consistent use of the yuan as the settlement currency for a critical infrastructure access fee in global energy markets.

The volumes are not trivial. If Chinese and Indian carriers are collectively transiting 8-10 million barrels per day through the arrangement, and fees average $0.75/barrel, that represents $2.2-2.7 billion per year in yuan-denominated transactions bypassing the dollar system entirely. That is a rounding error in global trade terms, but the precedent is what matters.

Beijing has explicitly encouraged yuan settlement for energy transactions as part of its petro-yuan initiative launched after Russia’s 2022 invasion of Ukraine. The Hormuz toll arrangement is the most concrete proof-of-concept that the system can work at scale under real-world pressure conditions — including the threat of U.S. sanctions enforcement.

For context on how Iran’s economic maneuvering is affecting the broader Gulf region, see our analysis of Iran’s war and its economic impact on Saudi Arabia, UAE, and Qatar.

The Two-Tier Oil Market: What It Means Practically

The Hormuz toll system is accelerating the bifurcation of the global oil market into two distinct circuits. The first circuit — call it the yuan circuit — includes Iran, Russia, Venezuela, and increasingly Gulf producers like Iraq, who are routing growing volumes through Chinese and Indian intermediaries with yuan settlement. The second circuit — the dollar circuit — covers the Atlantic Basin, Japan, South Korea, and Australia, where WTI and Brent remain the pricing benchmarks and dollar settlement is standard.

The price differential between these circuits has become measurable. Oil flowing through the yuan circuit commands a $3-8 per barrel discount versus dollar-circuit oil, reflecting the sanctions risk premium, the limited refinery compatibility (many yuan-circuit barrels are Iranian heavy crude requiring specialized cracking), and the reduced liquidity of yuan settlement.

But that discount is also an opportunity. Asian refiners with the technical capability to process Iranian heavy crude are earning an enormous crack spread advantage. Chinese refining margins have been running 40-60% above their pre-conflict averages, directly attributable to access to discounted Hormuz-transit crude.

This structural dynamic is addressed in our broader coverage of how Strait of Hormuz disruptions are reshaping global shipping insurance costs.

The Legal Void and International Response

Iran’s toll system has no basis in international maritime law. Under the United Nations Convention on the Law of the Sea (UNCLOS), all vessels have the right of transit passage through international straits. Iran is not a party to UNCLOS, but the customary international law principle of free transit is nearly universally recognized.

The U.S. Navy’s Fifth Fleet, based in Bahrain, has nominally maintained a presence in the region but has not physically interdicted the toll system’s operations. The political calculus is difficult: physically blocking the yuan payment arrangement would require intercepting Iranian patrol boats and potentially Chinese commercial vessels — an escalation neither Washington nor Beijing is prepared to risk in the current environment.

The EU has condemned the arrangement diplomatically but has no enforcement mechanism beyond existing sanctions, which Iran is already circumventing. Lloyd’s of London has updated its war risk coverage maps to reflect Hormuz as a declared exclusion zone for Western-registered vessels, effectively codifying the market separation that Iran’s system has created.

Saudi Arabia and Gulf State Reactions

Riyadh’s response has been notably measured. Saudi Arabia ships the bulk of its oil exports through Hormuz, and while Saudi Aramco tankers operate under arrangements that nominally exempt them from Iran’s toll system — Riyadh and Tehran have back-channel agreements governing Saudi transit — the market uncertainty is real. Saudi Arabia has been quietly accelerating pipeline capacity on the East-West Crude Oil Pipeline, which bypasses Hormuz entirely and terminates at Yanbu on the Red Sea. That pipeline has a 5 million barrel per day capacity, but currently handles far less.

For a deeper look at Saudi Arabia’s economic navigation of this period, see our analysis of Saudi Arabia’s GDP, TASI recovery, and oil windfall in March 2026.