Iran appears to be looking at the Strait of Hormuz not only as a strategic military chokepoint, but potentially as a source of enormous recurring revenue.

The idea is simple on paper: ships using one of the world's most important energy corridors could be required to pay fees for security, navigation or other services.

The numbers being discussed are extraordinary.

A fee system could theoretically generate close to $20 billion a year, according to the analysis behind the latest Yahoo Finance report.

But there is a major problem with that calculation.

The Strait of Hormuz only generates enormous economic value because ships are willing and able to use it.

If fees become excessive, shipping companies may seek alternative routes, reduce traffic, increase insurance premiums or simply refuse to participate in a system they consider unacceptable.

That makes Iran's proposed revenue opportunity much more complicated than multiplying a fee by the number of ships passing through the waterway.

The Strait of Hormuz is not an ordinary shipping lane.

Before the current conflict, roughly 20% of global oil supply passed through the waterway. Reuters reported that traffic has since collapsed dramatically, with only six vessels recorded passing through on Monday compared with a 10-day average of about 11 during the current crisis. Before the war, daily traffic averaged between 125 and 140 vessels.

That makes the strait enormously valuable.

It is also enormously vulnerable.

Any disruption can immediately affect crude prices, tanker insurance, shipping costs and inflation expectations.

The latest market reaction illustrates the point.

On August 11, Brent crude rose $1.19 to settle at $88.91 a barrel, while U.S. West Texas Intermediate gained $1.07 to $83.20. Both benchmarks reached their highest closing levels since July 31.

The reason was straightforward: hopes for a U.S.-Iran agreement were fading, increasing fears that disruptions could continue.

The idea of charging vessels has been developing for months.

Iran has previously rejected the term "toll," arguing instead that vessels could pay for services such as navigation assistance, security and environmental protection.

Iranian officials have insisted that the country is not simply trying to monetize passage.

But the distinction has not convinced critics.

The proposed system has been described by opponents as an attempt to establish an Iranian-controlled payment and permission structure over a waterway that is crucial to international commerce.

Iran has also discussed cooperation with Oman around managing shipping and potentially collecting fees.

That creates a difficult legal and geopolitical question.

Who has the authority to charge vessels?

What services would they actually receive?

And would ships be legally required to pay?

At first glance, a $20 billion annual revenue figure sounds enormous.

But generating that amount consistently requires a functioning shipping corridor.

That means tankers, container ships and other vessels must continue using Hormuz at substantial volumes.

If the cost of using the strait becomes too high, shipping companies have several options.

They can reroute cargo.

They can use alternative pipelines where available.

They can rely on different export terminals.

They can negotiate special arrangements.

Or they can simply pass the cost on to customers.

None of those outcomes guarantees that Iran receives $20 billion.

In fact, the opposite could happen.

A high fee could reduce traffic and undermine the very revenue base Iran wants to monetize.

The proposal also raises serious questions under international maritime law.

The Strait of Hormuz is an international waterway connecting the Persian Gulf with the Gulf of Oman and the wider Indian Ocean.

Countries that depend on it have repeatedly opposed restrictions on freedom of navigation.

The international community has also raised concerns about any attempt to impose transit charges that function as ordinary tolls.

Iran has tried to frame its proposal differently, emphasizing payment for actual maritime services rather than simply charging ships for the privilege of passing through.

That distinction could become central to any future agreement.

If a ship receives a genuine navigation, safety or environmental service, a charge may be easier to justify.

If the payment is effectively a compulsory toll for passage, the legal and diplomatic consequences could be much greater.

Even if a fee system could be legally constructed, commercial shipping companies would still have to accept it.

That is not guaranteed.

Shipping companies already face higher insurance premiums, security risks and longer routes because of the conflict.

Adding a significant new fee could increase costs further.

Those costs would eventually spread through the global economy.

Oil importers would pay more.

Refiners could face higher expenses.

Consumers could see higher fuel prices.

And businesses dependent on maritime transportation could face additional inflationary pressure.

The consequences would therefore reach far beyond Iran.

The timing is particularly sensitive because global energy supplies are already being disrupted.

Reuters reported that Brent crude was up about 44% so far this year, with the Iran conflict and attacks on Russian energy infrastructure limiting global supply.

That means markets have very little tolerance for another major disruption.

If Hormuz remains restricted for an extended period, the consequences could become increasingly severe.

Energy-importing countries would need to draw more heavily on alternative suppliers and transportation routes.

Strategic reserves could become more important.

And governments could face renewed pressure to reduce their dependence on Middle Eastern oil.

There is an interesting contradiction at the heart of Iran's proposal.

The more valuable the Strait of Hormuz is, the more money a fee system could theoretically generate.

But the more valuable the strait is, the more difficult it becomes for other countries to accept any attempt to control access to it.

The world's major economies have strong incentives to keep the waterway open and affordable.

That means Iran could face intense diplomatic pressure if it attempts to turn the strait into a major revenue-generating system.

From Iran's perspective, however, the proposal has a strategic logic.

The country controls a significant portion of the coastline surrounding the strait.

The waterway is close to Iranian territory.

And the current conflict has demonstrated just how powerful the chokepoint can be.

A formalized fee system could potentially give Iran another source of revenue while strengthening its influence over maritime traffic.

It could also become a bargaining chip in negotiations with the United States and regional countries.

But turning that bargaining power into permanent economic revenue is much harder.

The immediate situation remains uncertain.

Iranian officials have said the strait will remain closed as long as the United States does not change its behavior and accept Iran's conditions for ending the conflict. Reuters reported that the comments were among the strongest indications that a potential deal would not automatically restore normal shipping unless Washington met Tehran's demands.

That means the debate over fees is happening against a much larger geopolitical backdrop.

The issue is not simply money.

It is sovereignty.

Security.

Freedom of navigation.

Energy markets.

And the balance of power in the Persian Gulf.

Iran may be looking at Hormuz and seeing an extraordinary economic opportunity.

But shipping companies and global governments may see something very different: another cost imposed on an already fragile global energy system.

That is why the proposed revenue figure should be treated as a theoretical ceiling rather than a guaranteed payday.

A fee system only works if ships keep coming.

And ships will only keep coming if the waterway is considered safe, legally navigable and economically worthwhile.

If the price becomes too high, the strategy could undermine itself.

The Strait of Hormuz is valuable precisely because it connects producers and consumers.

Trying to turn that connection into a giant cash register could produce enormous revenue—but it could also trigger a powerful international backlash.

For oil markets, shipping companies and consumers around the world, the stakes are far larger than the fee itself.

The real question is not whether Iran can charge for Hormuz. It is whether the world will agree to pay.