LONDON, July 13 — The story begins not with a barrel of oil, but with a narrow stretch of water that the world’s energy economy cannot escape. Brent crude prices now sit at $92 per barrel, a 4% rise that followed President Donald Trump’s announcement of a 20% toll on cargo passing through the Strait of Hormuz. For those involved in the global oil trade—traders in London, refiners in India, shipping insurers in Singapore—the move redraws the map of risk overnight.
At its heart, this is about a chokepoint. The Strait of Hormuz handles roughly 21 million barrels of oil every day, about 30% of all seaborne crude.
That makes it the single most critical passage for the world’s oil supply. When the U.S. Treasury’s Office of Foreign Assets Control enforces a toll, it can sanction shipping companies and insurers who fail to comply. The machinery of pressure is well tested.
What unfolded on March 18 was a sharp market reaction. Analysts estimate the toll could reduce oil flows through the strait by 10% to 15%.
If Iran retaliates by closing the strait entirely, those same analysts see Brent hitting $100 per barrel. For context, past disruptions show how quickly the ground can shift. In 2019, attacks on Saudi Aramco’s Abqaiq and Khurais facilities cut 5.7 million barrels per day from global supply and sent prices up 15% in a single day.
The 2020 COVID-19 pandemic told the opposite story: Brent crashed to $20 per barrel in April of that year. The 2023 average for Brent, according to the U.S. Energy Information Administration, was $82 per barrel.
Who feels the pressure
The United States is now the world’s largest oil producer, pumping 13.2 million barrels per day in 2024. That scale reduces America’s dependence on Middle East imports. But the story is different for Asian economies.
China imported 11.4 million barrels per day in 2023. India imported 4.7 million.
Both are heavily dependent on oil that moves through the Strait of Hormuz. For them, a toll on that passage—or a closure—is not a distant geopolitical maneuver. It is a direct cost on everything from transport fuel to industrial feedstocks.
The mechanics of enforcement matter here. OFAC can target not just shippers, but the insurers who underwrite their voyages.
That reach makes compliance almost unavoidable for major international firms, even if the toll itself is new.
A familiar playbook
The Trump administration’s previous ‘maximum pressure’ campaign on Iran offers a template for what could come next. That effort reduced Iran’s oil exports from 2.5 million barrels per day in 2018 to 300,000 in 2020. The tools were similar: sanctions, shipping interdictions, and financial isolation.
Now, a toll on the strait itself adds a new layer. It targets not just Iranian oil, but all crude moving through the passage.
The potential for retaliation remains the open question. Iran has threatened to close the strait before. If it follows through, the 10% to 15% reduction analysts currently project could become a far more severe disruption.
For the markets, the calculus is straightforward: less supply, higher prices. For the economies that depend on that supply, what comes next will depend on how long the toll lasts, whether Iran responds, and whether the world’s largest producer—the United States—can fill the gap.
Sources
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