On March 26, 2026, Fortune reported that Iran's IRGC is charging ships up to $2 million each for safe passage through the Strait of Hormuz. The payments are settled in yuan, routed through China's Cross-Border Interbank Payment System — not SWIFT, not dollars. Iran's parliament is drafting legislation to formalize the toll. Tehran's ceasefire demands include international recognition of its sovereignty over the strait.
Most coverage treats this as a wartime shakedown. It is something else entirely. The toll is building an institution.
The Only Precedent
There is exactly one historical case of a state successfully monetizing an international strait for centuries: Denmark's Sound Dues.
Four hundred and twenty-eight years. That’s how long the Sound Dues lasted. The toll survived wars, revolutions, the rise and fall of empires. It took a multilateral treaty and a buyout equal to Denmark’s annual expenditure to end it.
Iran’s parliament is not improvising. It is legislating.
The Currency Follows the Chokepoint
Here is the pattern that no one is naming.
When Denmark controlled the Øresund, tolls were collected in the Danish Crown’s currency. When Egypt nationalized the Suez Canal in 1956, a new financial order followed — today Suez tolls are denominated in Special Drawing Rights and collected primarily in US dollars, the currency of the power that forced Britain’s withdrawal by threatening its credit at the IMF. The chokepoint’s toll currency reveals who holds the real leverage.
Now look at Hormuz.
| Chokepoint | Controller | Toll Currency | Payment System | Patron Power |
|---|---|---|---|---|
| Øresund (1429–1857) | Denmark | Rigsdaler | Cash at Kronborg | Self-sovereign |
| Suez (1956–present) | Egypt | SDR / USD | SWIFT | United States |
| Hormuz (2026–?) | Iran / IRGC | Yuan (CNY) | CIPS | China |
The toll currency is not arbitrary. It is a declaration of alignment. Iran isn’t just monetizing Hormuz — it is routing global energy payments through China’s financial infrastructure. Every transaction creates a precedent. Every settled toll is a data point for CIPS. Every yuan that passes through Hormuz is a dollar that doesn’t.
The Infrastructure Is Already Built
This is why the Hormuz toll matters more than a $2 million-per-ship war tax. The financial infrastructure to sustain it already exists and is scaling fast.
CIPS is not a prototype. It processes more in a year than most nations’ GDP. mBridge is not theoretical. It is settling energy transactions between central banks. The Hormuz toll doesn’t need new infrastructure — it plugs into infrastructure that has been built, tested, and scaled over the past decade.
This is the difference between the Hormuz toll and a wartime improvisation. Wartime measures use whatever is available. This toll uses a purpose-built parallel financial system.
What the Sound Dues Teach Us
Denmark’s experience reveals something uncomfortable: chokepoint tolls are extraordinarily difficult to remove once institutionalized.
The Sound Dues survived because they created dependencies on both sides. Denmark needed the revenue — it funded the state. But the trading nations also adapted: they factored the toll into shipping costs, negotiated preferential rates, and built relationships with Danish toll collectors. The toll became embedded in how Baltic trade worked. Removing it required compensating Denmark for the loss (35 million rigsdaler — roughly a full year of state expenditure) and getting every major maritime power to agree simultaneously.
Iran is building the same kind of dependency. The toll creates revenue Iran needs. But it also creates habits: shipping companies are learning the process, intermediaries are profiting, CIPS transaction patterns are forming. Every week the toll operates, it becomes harder to remove.
“War has costs, naturally, we must take transit fees.”
— Iranian lawmaker Mohammadreza Rezaei Kouchi, Foreign Policy, March 26, 2026
The Copenhagen Convention of 1857 took 428 years to arrive. Iran is already on the legislative fast-track.
Three Tolls, One Pattern
Pull back and the pattern becomes clear. Chokepoint monetization follows a sequence:
Iran is currently at stage 3, moving toward stage 4. The IRGC controls the strait (stage 1). Rates and intermediaries are established (stage 2). Parliament is drafting legislation (stage 3). And Iran’s ceasefire demand for “sovereignty over the Strait of Hormuz” is an attempt to skip directly to stage 5 — making the toll internationally recognized.
But the currency dimension adds something the Sound Dues never had.
The Structural Shift
Denmark’s Sound Dues enriched Denmark. The Suez Canal enriches Egypt. These are bilateral arrangements: one state controls a chokepoint, the world pays to pass through.
The Hormuz toll is trilateral. Iran controls the chokepoint. China provides the currency and the payment system. And every nation that routes a tanker through the strait participates in building CIPS transaction volume, normalizing yuan settlement, and creating an alternative to the dollar-SWIFT system.
This is what makes the pattern new. The toll isn’t just enriching Iran. It is constructing institutional plumbing for a parallel financial order.
India is already settling 60 million barrels per month of Russian crude in yuan and dirhams. The Shanghai International Energy Exchange handles 14% of global crude oil futures volume. Saudi Arabia and China signed a $7 billion currency swap. These are the rails. The Hormuz toll is the train.
If the toll survives the war — if it gets written into a ceasefire agreement, or simply persists because no one can stop it — it becomes a template. Any state that controls a chokepoint can do the same thing: monetize it, denominate the toll in a non-dollar currency, and route payments through CIPS. The Strait of Malacca. The Turkish Straits. The Mozambique Channel. Each one is a potential toll booth for a parallel financial system.
What to Watch
The signal isn’t the toll itself. Tolls are old. The signal is the combination: chokepoint control + non-dollar denomination + purpose-built alternative payment system + legislative formalization + ceasefire demands for permanent sovereignty.
That combination has never existed before. And the fact that every element is already in place — not planned, not proposed, but operating — is the emergence signal.
Watch for:
- Iran’s parliamentary vote — formal legislation converts a war measure into permanent policy
- CIPS March 2026 transaction data — already at record levels; sustained spikes indicate structural adoption, not one-off payments
- Ceasefire terms — whether “sovereignty over Hormuz” survives negotiation. If it does, the toll is permanent by international agreement
- Copycat behavior — any state that begins discussing chokepoint monetization in non-dollar currencies
The petrodollar was not built by decree. It was built by the accumulation of transactions — each individual oil purchase settled in dollars, until settling in dollars was simply what you did. The yuan toll at Hormuz is the same mechanism running in reverse. Each tanker that pays in yuan is a small subtraction from the dollar system and a small addition to the yuan system.
Denmark charged tolls at the Øresund for 428 years. It took the combined treasuries of Europe to make it stop. Iran is four weeks in, and it’s already drafting the legislation.