# Iran–Oman Hormuz Fee Plan Triggers Legal Clash and Market Pressure *Tuesday, June 23, 2026 at 6:09 PM UTC — Hamer Intelligence Services Desk* **Published**: 2026-06-23T18:09:37.924Z (3h ago) **Category**: geopolitics | **Region**: Middle East **Importance**: 9/10 **Sources**: OSINT **Permalink**: https://hamerintel.com/data/articles/8522.md **Source**: https://hamerintel.com/summaries --- **Deck**: Iran and Oman have agreed to study charging "service costs" for ships using the Strait of Hormuz, testing the limits of maritime law on one of the world’s most critical energy corridors. Washington has moved quickly to draw a red line, with Secretary of State Marco Rubio calling any tolls on the waterway unlawful and vowing they will not be permitted under a final deal. Talk of new charges in the Strait of Hormuz is enough to tighten stomachs in every energy ministry and shipping insurer in the world. When the prospective fee is floated by Iran and Oman, at a time of war involving Iran and its proxies, the risk is not only higher costs but a fresh legal fight over who really controls the Gulf’s most fragile chokepoint. In a joint statement released on 23 June, Iran and Oman said they would study imposing so‑called "service costs" on vessels transiting the Strait of Hormuz. The language is vague, but for tanker operators and commodity traders it reads as a potential toll regime across a passage that carries a significant share of globally traded crude and liquefied natural gas. Within hours, U.S. Secretary of State Marco Rubio publicly rejected the concept, insisting that Iran "will not be permitted" to impose tolls or service charges on ships as part of any final agreement with Washington and describing such a move as unlawful under international norms. Rubio sharpened the U.S. position further in separate remarks, calling the strait an "international waterway" where "no country is allowed to charge tolls or fees." That echoes long‑standing U.S. interpretations of the law of the sea, under which narrow but heavily used passages are treated as international straits with a right of transit passage. Tehran and Muscat have not publicly detailed what services they believe justify additional costs, nor how they would be calculated or enforced. For now, the idea is officially at the study stage, but Washington is treating it as a live test of red lines. For ship crews and commercial operators, the immediate concern is not a courtroom argument but the risk that a legal dispute transforms into operational pressure. Even a non‑binding fee scheme could expose captains to new inspections, delays, or harassment if they refuse to pay, and could raise insurance premiums for voyages in and out of the Gulf. Energy importers in Asia, Europe and beyond are particularly exposed: every added layer of uncertainty in Hormuz feeds into freight rates and hedging costs well before any physical disruption occurs. For Iran and Oman, the proposed "service costs" are about more than revenue. Tehran has long sought to leverage its geography at Hormuz as strategic ballast against U.S. sanctions and regional rivals, while Oman routinely positions itself as a mediator and facilitator in Gulf disputes. Jointly exploring fees signals closer coordination between the two on how the strait is managed, and offers Tehran a way to test the boundaries of what its neighbors – and global powers – will tolerate without resorting to overt threats to close the passage. The U.S. response shows how little appetite Washington has for anything that looks like incremental control by Iran over global oil flows at a time of wider confrontation. Rubio has coupled his legal warning on Hormuz with demands that Iran‑aligned groups, from Iraqi militias to Hamas and Hezbollah, halt missile and drone attacks if they want a regional de‑escalation. In effect, he is tying Iran’s behavior at sea, on land, and at the negotiating table into a single standard of conduct, even as Iran’s president insists the country’s missile program is off‑limits in any memorandum of understanding. Hormuz risk does not require a formal blockade to matter; it only needs enough ambiguity over rules and enforcement to make shippers, insurers and governments hesitate. That is the danger in a "study" that could, over time, harden into practice, especially if energy markets are already tight or if another incident pushes war risk premiums higher. The next signals to watch are whether Tehran and Muscat offer technical detail on what they mean by "service costs," and whether any Gulf Cooperation Council states quietly back or oppose the idea. Any move by shipping associations or major importers to seek clarity – or by U.S. naval forces to adjust their public posture in the strait – will show how seriously capitals take the risk that a legal experiment in Hormuz turns into a new source of geopolitical leverage.