12JUN

Iran-Oman draft toll outside US reach

4 min read

09:18UTC

IRNA confirmed Iran is drafting a bilateral transit protocol with Oman; Fortune reports a toll-collection mechanism. Oman's territorial waters cover the southern half of the strait under UNCLOS, placing the levy outside CENTCOM's enforcement geometry.

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Key takeaway

Iran is engineering a Hormuz toll Washington cannot lawfully block by routing it through Oman's UNCLOS waters.

IRNA confirmed on 27 April that Iran is drafting a bilateral transit protocol with Oman to oversee Strait of Hormuz passage ¹. Fortune reports the protocol carries a toll-collection mechanism Iran could not impose unilaterally ². Abbas Araghchi, Iran's Foreign Minister, met Sultan Haitham bin Tariq in Muscat on Sunday 26 April to negotiate the arrangement , six days after an IRGC drone struck Salalah port in Oman's south.

The legal mechanics are doing the work. Under the UN Convention on the Law of the Sea (UNCLOS), Oman's territorial waters extend twelve nautical miles from its coast and cover the southern half of the 33-kilometre chokepoint. A toll administered through a UNCLOS-compliant Gulf state sits outside CENTCOM's enforcement geometry by design. Washington can interdict tankers under the blockade order signed in April, but it cannot override a transit fee imposed inside Omani jurisdiction without picking a fight with Muscat, the only Gulf capital still trusted by both Tehran and the West.

The sequencing alongside Phase 2 of Iran's three-phase Pakistan text matters here. The bilateral with Oman is the operational instrument Iran would point to if Phase 2 stalls; revenue through Muscat does not require Washington's signature. The 1968 IMO traffic-separation scheme governing the strait is jointly operated by Iran and Oman to this day, which gives the protocol an institutional foothold the strait's other framework drafters do not have.

Deep Analysis

In plain English

Iran wants to charge ships a fee for passing through the Strait of Hormuz. If Iran collects that fee on its own, the US argues it is illegal and CENTCOM can block the vessels. Iran's answer is to route the toll through Oman instead. Oman, the country whose coastline runs along the southern half of the strait, has agreed to co-administer a toll collection system with Iran. Because Oman is a respected Gulf state that has signed the international maritime law convention (UNCLOS), a toll collected through Oman sits in a legal grey zone that the US cannot simply override with a military order. Think of it as Iran finding a licensed partner for a business it could not operate alone. The US Navy can stop Iranian ships. It cannot easily stop Omani-administered shipping fees without confronting Oman, which is the one Gulf capital both Tehran and Washington still talk to.

Deep Analysis

Root Causes

The Oman protocol's structural origin lies in a specific legal gap: Iran never ratified UNCLOS, which means it cannot invoke UNCLOS transit-passage doctrine to justify toll collection in the strait. Oman ratified UNCLOS in 1989. A toll collected inside Omani territorial waters under a bilateral protocol with UNCLOS-signatory authority is not subject to the same legal challenge as a unilateral Iranian toll in waters whose legal status Iran contests.

The 1968 IMO traffic-separation scheme is jointly administered by Iran and Oman, which gives Muscat an existing operational stake in Hormuz governance. Iran is exploiting that legacy institutional footprint: by embedding the toll in the existing co-administration framework, Tehran transforms a new revenue mechanism into an extension of a 58-year-old bilateral arrangement that no US naval order has previously needed to override.

What could happen next?

Consequence
If signed, the Iran-Oman protocol creates a revenue stream for Tehran that bypasses both CENTCOM's blockade geometry and OFAC's sanctions architecture, giving Iran economic durability independent of any ceasefire.
Short term · 0.75
Risk
An OFAC designation of any Omani entity involved in toll collection would force Muscat to choose between the toll revenue and dollar-system access, potentially collapsing both the protocol and Oman's mediating role.
Short term · 0.7
Precedent
A signed Iran-Oman Hormuz protocol would be the first multilateral legal instrument governing the strait's toll collection, establishing a template that could outlast the current conflict and constrain future US freedom-of-navigation operations.
Long term · 0.68

Source Landscape

This story draws on centre-leaning sources from Oman and United States

Oman

United States

LeftRight

Primary parallel: Britain's 1984 mining strike used secondary-boycott law to try blocking coal imports through dock workers, creating a domestic legal instrument for an international trade restriction.

Iran is now attempting the same structural pattern in reverse: using a bilateral maritime administration arrangement with a neutral third state to enforce a revenue mechanism that would be illegal under international law if applied unilaterally. The Oman protocol is the legal instrument that transforms an IRGC toll into a Gulf-state customs authority.

Counter-parallel: Iran ran a functionally equivalent bilateral arrangement with Oman over Hormuz transit in March 2026, when eleven flag states paid IRGC tolls routed partly through Omani waters .

That arrangement operated without a written protocol for six weeks before the CENTCOM blockade reduced transits to near-zero. The difference in the current draft protocol is the explicit written bilateral form: a signed protocol would convert an ad-hoc practice into a legal instrument resistant to US pressure.

Oman's territorial waters cover the southern 12 nautical miles of the 33-kilometre strait. Any vessel transiting the northern channel, inside Iranian territorial waters, would still face IRGC toll demands directly. The Oman protocol's toll mechanism applies to the southern channel, covering approximately half of inbound and outbound traffic.

At the IRGC's reported pre-blockade rate of $1 per barrel in yuan or stablecoins, a bilateral protocol applied to the southern channel at pre-war volumes of 10 million barrels per day (half the 20 million total) would generate $3.6 billion per year in toll revenue for the administering parties.

For Oman, the economic logic is compelling: Sultan Haitham is navigating a period of reduced oil revenue as Oman's own fields mature, and a portion of transit toll revenue from the world's most consequential chokepoint represents a windfall. The $3 billion Saudi debt-assistance package that underpins Islamabad's mediating role (and by extension Oman's) creates a regional incentive structure in which Riyadh also has a stake in the protocol's success.

Consensus view: Quincy Institute for Responsible Statecraft's Trita Parsi and Chatham House's Neil Quilliam both assess the Oman protocol as Iran's most legally durable revenue instrument of the war: by routing the toll collection through a UNCLOS-ratifying Gulf state whose territorial waters cover the southern half of the strait, Iran converts a unilateral revenue claim into a bilateral maritime administration arrangement.

Oman's 1968 IMO co-administration role over the strait's traffic-separation scheme provides the institutional foothold no other party in the three-framework contest possesses.

Counter-view: Heritage Foundation's James Carafano argues the Oman protocol cannot survive a US determination to treat Muscat as a sanctions-compliance risk: if OFAC designates any Omani entity involved in toll collection, Oman's incentive to participate collapses, since Muscat's $7 billion in annual trade with the US and EU far exceeds whatever toll revenue Iran can offer.

AEI's Kenneth Pollack notes Oman's post-IRGC drone strike on Salalah port (six days before Araghchi's visit) as evidence Tehran's leverage over Muscat is coercive, not cooperative, which undermines the protocol's durability as a voluntary bilateral arrangement.

Key tension: Whether the US will treat the Iran-Oman toll protocol as a sanctions-compliance problem for Muscat, which would force Oman to choose between toll revenue and access to the dollar system, or whether Washington will tolerate a UNCLOS-compliant toll to avoid a confrontation with the one Gulf capital trusted by both sides.

First Reported In

Update #81 · Iran writes Phase 3; Trump posts Phase 1

Oman Observer· 27 Apr 2026

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Causes and effects

Caused by

Araghchi reaches Muscat after Salalah strike

Araghchi's Muscat meeting with Sultan Haitham directly produced the confirmation that Iran and Oman are drafting a bilateral Hormuz transit protocol

Occurred 26 Apr 2026

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This Event

Iran-Oman draft toll outside US reach

A toll administered through a UNCLOS-compliant Gulf state is a revenue instrument no US naval order can lawfully block; Iran is engineering around the blockade rather than confronting it.

Led to

Iran files three-phase deal; nuclear last

Iran's Oman bilateral toll protocol is the Phase 2 Hormuz governance mechanism Iran proposes to substitute for the US-rejected unilateral toll, running in parallel to the Phase 1-first diplomatic proposal

Occurred 27 Apr 2026

Read story →

Different Perspectives

Oil markets and Lloyd's of London

Brent fell to $89.25 on ceasefire probability, not new barrels, with traders voting for Trump's deed over Tehran's denial. Lloyd's has not repriced Hormuz war-risk cover because its trigger requires a UN Security Council resolution or government certification, so tanker insurance costs remain elevated regardless of the spot move.

Pakistan and Qatar mediators

Pakistan's Mohsin Naqvi was in Tehran for his second visit in under a week, using the Pakistan-Qatar channel that delivered April's ceasefire after an identical public-denial cycle. The channel carries both civilian and military buy-in from Islamabad, the only configuration Iran's split command cannot dismiss as a partial signal.

India

India summoned the US Deputy Chief of Mission after three Indian sailors were killed aboard MT Settebello, the first formal grievance from a major non-belligerent directed at US enforcement. Indian seafarers supply roughly 12 per cent of the global maritime workforce; their presence on third-flag Gulf tankers is structurally inevitable regardless of bilateral diplomacy.

Islamic Revolutionary Guard Corps (IRGC)

The IRGC declared Hormuz closed on 11 June while civilian negotiators were on the same mediation channel, then issued no public comment on the MoU framework. Its silence on the framework, rather than any foreign ministry statement, is the operative approval signal; the corps' unilateral Hormuz closure shows it did not treat the diplomatic track as binding on its operations.

Iran foreign ministry (Baghaei)

Esmail Baghaei told IRNA that reports of a finalised deal were 'merely speculation' and that Iran had 'not yet made a final decision'. The denial is structurally identical to Iranian foreign ministry statements during the April ceasefire talks, which produced a binding text within 48 hours of the same language.

Trump administration / CENTCOM

Trump cancelled the third strike day and called the MoU 'very strong' and almost ready to sign, while CENTCOM kept tanker enforcement running in the same 24-hour window. The administration is simultaneously withdrawing the military pressure it claims drove the deal and sustaining the enforcement campaign it is trying to trade away.