Iran and Oman Advance Proposal to Impose Maritime Fees on Strait of Hormuz Shipping

The era of unimpeded, toll-free navigation through the world's most critical energy chokepoint is facing a structural challenge. Iran and Oman are advancing a joint diplomatic and economic proposal to levy a maritime transit fee on commercial shipping passing through the Strait of Hormuz. The initiative seeks to formalize coastal sovereignty over the narrow waterway, fundamentally altering the logistics of global maritime commerce.[1][3]

The Strait of Hormuz connects the Persian Gulf to the Indian Ocean and serves as the primary artery for approximately one-fifth of global oil supplies. At its narrowest point, the waterway is just 21 miles wide, placing the shipping lanes entirely within the territorial waters of Iran to the north and Oman to the south. Historically, merchant vessels have transited this corridor without facing sovereign financial charges.[1][4]

The proposed mechanism involves charging shipping companies a dedicated fee to utilize the traffic separation scheme. Tehran has pushed for a mandatory toll ranging from 5% to 7% of a vessel's cargo value, a figure that could equate to millions of dollars per voyage or roughly a $1 per barrel impact on oil prices. Muscat, conversely, has discussed a lower threshold of around 3%, emphasizing a different legal framework.[3]

To justify the charges, the two coastal states are framing the payments not as a toll for the right of passage, but as a fee for maritime services. This includes compensation for navigation assistance, traffic management, emergency response, and environmental safeguards. By categorizing the levy as a service charge, the proposal attempts to bypass international prohibitions on taxing freedom of navigation.[2][4]

A recent research memo from JPMorgan circulated among financial institutions suggests this service-fee framework could possess a viable legal basis. The analysts cited existing precedents in global shipping, noting that Denmark and Sweden impose fees linked to transit services and environmental protections in the Danish straits. Similarly, Turkey manages the Bosporus and Dardanelles under the 1936 Montreux Convention, charging vessels for lighthouses, health inspections, and rescue operations.[2]

However, the legal claim faces intense international resistance anchored in the United Nations Convention on the Law of the Sea (UNCLOS). The treaty guarantees the "transit passage" of all ships through international straits, explicitly prohibiting coastal states from levying tolls simply for access. While UNCLOS permits charges for specific rendered services, opponents argue the Hormuz proposal is coercive.[4]

The global shipping industry has uniformly condemned the initiative. In a joint letter to the UN's International Maritime Organization, eight of the world's largest shipping associations warned that introducing compulsory charges would establish a dangerous precedent. Representatives from major carriers, including Germany's Hapag-Lloyd, characterized the proposal as a "toll in all but name," noting that unlike the Suez or Panama canals, Hormuz requires no major infrastructure investments to facilitate transit.

The broader uncertainty centers on the precedent this would set for other contested maritime chokepoints. If Iran and Oman successfully monetize the Strait of Hormuz, maritime analysts warn that similar sovereign toll frameworks could be applied to the Strait of Malacca—a critical corridor between Singapore, Malaysia, and Indonesia—or the Taiwan Strait, severely disrupting the economics of global supply chains.

The push to formalize control over the strait cannot be separated from the region's recent geopolitical volatility. The proposal follows a destructive period of conflict in February 2026, which included U.S.-Israeli airstrikes and the laying of approximately 80 naval mines by Iranian forces within the strait's traffic separation scheme. The mining effectively paralyzed transit, trapping thousands of seafarers and forcing vessels to navigate perilous routes near the Omani coast.

Currently, maritime traffic is operating under a fragile 60-day memorandum negotiated between the U.S., Iran, and Oman. This temporary agreement requires Tehran to ensure toll-free passage for commercial vessels while the mines are cleared. However, Iranian officials have explicitly stated their intention to implement the fee structure to cover the costs of managing the waterway once the 60-day window expires.[5]

The U.S. government has flatly rejected the premise of the negotiations. The Trump administration has insisted that it will accept no deal that includes tolls in the Strait of Hormuz, threatening severe consequences if freedom of navigation is permanently restricted. Washington views the fee proposal not as a legitimate administrative charge, but as an extortion mechanism designed to generate revenue for Tehran under the guise of maritime security.[1][4]

Enforcement of the proposed fees presents another layer of structural uncertainty. Even if a joint Omani-Iranian framework is established, Western shipping companies face insurmountable compliance hurdles. U.S. sanctions and restrictive insurance clauses make processing direct payments to Iranian state entities nearly impossible for international banks and maritime insurers.

Recognizing these friction points, fractures have emerged between the two coastal partners. Omani diplomats have publicly stated that forcing ships to pay for passage violates international law, advocating instead for a voluntary contribution model similar to the one used in the Straits of Malacca and Singapore. Tehran, seeking guaranteed revenue and strategic leverage, continues to push for mandatory enforcement, leaving the ultimate architecture of the strait's future unresolved.[1][3]