Hormuz toll plan collides with global law and power politics

Iran’s reported move to impose tolls on ships passing through the Strait of Hormuz has triggered a high-stakes legal and geopolitical clash, with global energy flows — and the rules of maritime order — hanging in the balance.

A Chokepoint With Global Consequences

The Strait of Hormuz is no ordinary waterway. Linking the Gulf to the Gulf of Oman, it carries roughly a fifth of the world’s oil, making it one of the most critical arteries in the global economy.

Any disruption reverberates instantly — from fuel prices in Europe to supply chains in Asia — putting governments and markets on edge.

Law Says Passage Must Be Free

At the heart of the dispute is the United Nations Convention on the Law of the Sea, which guarantees “transit passage” through key international straits. That principle is designed to keep chokepoints like Hormuz open, even when tensions spike.

While coastal states can regulate safety and security within their waters, they are not permitted to block or monetise basic passage. Charging tolls for safe transit cuts directly against that norm.

Iran’s Legal Grey Zone

Tehran’s position is more complicated. Iran has not ratified UNCLOS and has long argued it is not bound by all its provisions, particularly where it has consistently objected.

Most legal experts disagree, viewing the rules on free navigation as customary international law — binding regardless of formal ratification. The United States, also a non-signatory, rejects Iran’s claim outright.

No Referee — Only Power

Even if Iran’s move is deemed unlawful, enforcement is another matter. Bodies like the International Court of Justice can issue rulings, but lack the power to compel compliance.

That leaves enforcement to states. Naval escorts, sanctions, or UN action could follow — each carrying escalation risks in an already volatile region.

Shipping Firms Already Blink First

The immediate impact is commercial. Some companies are already rerouting vessels to avoid potential tolls and confrontation, accepting higher costs over uncertainty.

If the standoff hardens, the burden will fall fast — on insurers, energy markets and ultimately consumers — turning a legal dispute into a global economic squeeze.

Explainer - Can Iran legally impose tolls on the Strait of Hormuz?