Can Iran Legally Charge Ships to Cross the Strait of Hormuz? What International Maritime Law Says
For millions of people, the story may appear to be about oil prices, military tensions or another disruption to global shipping. But there is a much bigger question underneath all of this:
Can a country legally charge commercial ships simply for passing through an internationally important maritime strait?
The question has become particularly important as the current crisis around the Strait of Hormuz continues to affect commercial shipping and energy markets. International shipping organizations have raised concerns about proposed compulsory charges connected with passage through the Strait, while the International Maritime Organization (IMO) has repeatedly called for the protection of commercial vessels and safe navigation.
For international law, this is not a simple question of who controls the water.
It involves freedom of navigation, the law of the sea, coastal-state sovereignty, transit passage and the rights of foreign commercial vessels.
Why Does the Strait of Hormuz Matter So Much?
The Strait of Hormuz is a narrow waterway between Iran and Oman that connects the Persian Gulf with the Gulf of Oman and the Arabian Sea.
Its geographical importance is difficult to overstate.
Large quantities of oil and liquefied natural gas move through the region, making the Strait one of the world's most important maritime chokepoints. Any serious disruption can therefore affect shipping companies, energy markets and consumers far beyond the Middle East.
The Strait is also an established international shipping route. The IMO has long been involved in navigation arrangements in the area, including the Traffic Separation Scheme designed to help ships navigate safely through the waterway.
That is why a restriction on shipping through Hormuz is not merely a local issue.
It can quickly become a global one.
The Legal Question: Does Iran Control the Strait?
Iran has sovereignty over its territorial sea, but sovereignty does not necessarily mean that a coastal state can do whatever it wants with international navigation.
This distinction is important.
Under the United Nations Convention on the Law of the Sea (UNCLOS), certain straits used for international navigation are subject to a special legal regime known as transit passage.
Article 38 of UNCLOS provides for the right of transit passage through such straits.
In simple terms, transit passage is intended to allow ships and aircraft to move continuously and expeditiously through an international strait.
That creates a balance between two interests.
On one side is the sovereignty of the coastal state.
On the other is the international community's interest in keeping important maritime routes open.
The Strait of Hormuz sits directly within this legal tension.
What Exactly Is Transit Passage?
Transit passage is different from ordinary innocent passage.
Under innocent passage, coastal states have broader regulatory powers over certain activities taking place in their territorial seas.
Transit passage is specifically designed for straits that are important to international navigation.
The basic idea is straightforward:
A strategically important international strait should not simply become unavailable to international shipping because a coastal state decides to block navigation.
UNCLOS also places obligations on ships exercising transit passage. Vessels must proceed without delay and must comply with applicable international rules relating to navigation and safety.
So the right is not unlimited.
But neither is coastal-state control unlimited.
Can Iran Charge Ships for Passing Through?
This is where the issue becomes particularly interesting.
A compulsory payment imposed merely because a foreign commercial vessel wants to exercise a right of navigation could face serious questions under the international law of the sea.
However, it is important not to oversimplify the issue.
There is a legal difference between:
a fee for a genuine service or facility, and
a charge imposed as a condition for obtaining access to an international navigation route.
For example, a payment connected to a specific port service may be legally different from demanding a toll simply for exercising a navigation right.
The exact legal position would therefore depend on how a proposed Hormuz charge is structured, who imposes it, what service it supposedly covers and whether payment is effectively being made a condition for passage.
That is why the question cannot be answered simply with “yes” or “no”.
Could a Transit Fee Interfere with Freedom of Navigation?
Potentially, yes.
If a compulsory charge were used to make international navigation through the Strait more difficult, expensive or conditional, affected states and shipping companies could argue that the measure interferes with the internationally recognized navigation regime.
This is particularly significant because the Strait is not simply a domestic waterway.
Its importance comes from international navigation.
The legal argument would therefore focus on whether the charge is compatible with the rights and obligations applicable to international straits.
And there is another important issue.
What happens if a ship refuses to pay?
Would the vessel be denied passage?
Could it be detained?
Could force be used?
Each of these scenarios would raise additional questions under international law.
What If a Commercial Ship Refuses to Pay?
Suppose a tanker approaches the Strait and refuses to pay a compulsory transit charge.
The next legal question would be whether the coastal state can lawfully prevent that vessel from continuing its journey.
If the vessel is exercising a recognized right of transit passage, physically preventing passage could raise a much more serious legal dispute than the original fee itself.
The situation could potentially involve questions of:
freedom of navigation;
state responsibility;
use of force;
maritime security;
the status of the vessel;
and the applicable law of armed conflict.
This is one reason why shipping companies and governments pay such close attention to developments around the Strait.
A dispute that begins as a disagreement over a fee can quickly become a dispute about fundamental maritime rights.
What About Ships During an Armed Conflict?
The current situation becomes even more complicated when military conflict is involved.
International maritime law does not operate in isolation during an armed conflict.
The law of armed conflict, or international humanitarian law, may also apply.
That means the legal status of a vessel matters.
A commercial tanker carrying civilian cargo is not automatically a military target simply because it is operating in a strategically important area.
The principle of distinction requires parties to distinguish between military objectives and civilian objects.
At the same time, a civilian vessel can lose protection in particular circumstances if it directly participates in hostilities.
Those questions are highly fact specific.
Therefore, it would be misleading to say that every commercial ship is always immune from attack, just as it would be wrong to assume that every ship travelling through a conflict zone can lawfully be attacked.
What Does the IMO Say About Commercial Ships?
The International Maritime Organization has repeatedly expressed concern about attacks and threats affecting commercial shipping in the Strait of Hormuz.
The IMO has called for the protection of merchant vessels and seafarers and for safe navigation through the region.
That matters because the people physically moving global trade through the Strait are often ordinary civilian seafarers.
A tanker may be carrying millions of dollars' worth of cargo, but its crew are still human beings working on a commercial vessel.
The continuing crisis has therefore created not only a shipping problem but also a significant seafarer-safety issue.
Does UNCLOS Automatically Settle the Dispute?
Not completely.
UNCLOS provides an important legal framework, but the actual dispute can involve several overlapping bodies of law.
These may include:
The law of the sea — governing navigation and maritime zones.
International humanitarian law — where an armed conflict exists.
International human rights law — in circumstances where relevant.
General international law — including the rules concerning state responsibility.
Domestic law — including the laws governing individual vessels and companies.
There is also a separate question concerning treaty membership.
A country's relationship with UNCLOS does not necessarily answer every question because some principles reflected in the Convention may also exist as customary international law.
That makes the legal debate surrounding Hormuz considerably more complicated than simply checking whether a country has ratified one treaty.
Could Shipping Companies Claim Compensation?
Possibly, but there is no automatic answer.
If a vessel is delayed, damaged, detained or prevented from reaching its destination, the company may face enormous financial losses.
There could be claims involving:
cargo;
charter agreements;
insurance;
demurrage;
vessel damage;
crew costs;
delays;
and contractual obligations.
Whether a company could actually recover money from a state would depend on the circumstances and the available legal jurisdiction.
International law does recognize the concept of state responsibility where a state commits an internationally wrongful act.
But proving such a claim and obtaining an effective remedy are separate matters.
That distinction is particularly important in international disputes.
Why Would a Hormuz Toll Matter to the Rest of the World?
At first glance, a transit charge might seem like a dispute between Iran and shipping companies.
It is not.
If the cost of moving oil, LNG or other goods through a major maritime chokepoint increase, those costs can eventually travel through the global economy.
Higher shipping costs can affect:
fuel prices;
electricity costs;
manufacturing;
transportation;
insurance;
food prices;
and consumer goods.
The effects may therefore be felt by people who have never heard of the Strait of Hormuz before.
This is one reason freedom of navigation is so important in international law.
A maritime route can be geographically small but economically enormous.
Could This Create a Precedent for Other Chokepoints?
This may be the biggest long-term question.
The world depends on several strategically important maritime chokepoints.
If a state were able to impose significant restrictions on internationally protected navigation through one of them, other countries might look closely at the precedent.
That could affect legal debates involving other major routes, including:
the Suez Canal region;
the Bab el-Mandeb;
the Strait of Malacca;
and other strategically important maritime passages.
Of course, each waterway has its own geographical and legal characteristics.
But the underlying principle remains important:
How should international law balance coastal sovereignty with the world's need for reliable international navigation?
What Happens Next?
The legal debate surrounding the Strait of Hormuz is unlikely to disappear quickly.
Much will depend on how the current restrictions and proposed charges are implemented and how other states respond.
The most important developments to watch include:
Whether commercial vessels are actually required to pay a transit charge.
What legal basis is given for any such charge.
Whether vessels that refuse payment are denied passage.
Whether attacks on commercial vessels continue.
What steps the IMO and United Nations take.
Whether affected governments formally challenge the restrictions.
Whether shipping companies begin pursuing legal claims.
Each of these developments could change the legal analysis.
Conclusion
The Strait of Hormuz shows why international maritime law matters in the real world.
A legal rule written in an international treaty can eventually affect the price of fuel in another country, the insurance premium on a tanker, the safety of a seafarer or the ability of a company to deliver cargo on time.
The central issue is therefore not simply whether Iran controls part of the Strait.
The more important question is whether coastal sovereignty can be exercised in a way that is consistent with the international rights of navigation through a strategically important strait.
If compulsory charges, restrictions or enforcement measures interfere with those rights, the dispute could become one of the most significant maritime-law questions of the current crisis.
For now, the world will be watching Hormuz not only as an energy chokepoint, but also as a test of whether international maritime law can protect freedom of navigation when geopolitical tensions are at their highest.
Legal Disclaimer
This article is provided for general educational and informational purposes only. It does not constitute legal advice or a legal opinion. The legality of any particular action involving the Strait of Hormuz depends on the facts, applicable treaties, customary international law and the circumstances of any armed conflict.
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