The Strait of Hormuz, a narrow sea passage that connects the Persian Gulf to the Gulf of Oman and serves as the sole maritime outlet for several Gulf nations, is one of the world’s most critical energy chokepoints. Roughly one-fifth of global petroleum transit passes through these waters, making stability in the strait essential for international commerce.
On July 2, 2025, former President Donald Trump announced a campaign proposal that would directly target this waterway: a 20 percent toll on all cargo moving through the Strait of Hormuz. The levy, which Trump has pitched as part of his 2024 Republican presidential nomination platform, represents a new phase in his long-standing pressure campaign against Iran. The toll would apply to all shipments transiting the strait, including those from U.S. allies in the Persian Gulf, effectively taxing global trade to punish Iran for its regional activities.
Trump has indicated he would use this tariff as a lever to force Tehran back to the negotiating table on nuclear and regional issues. It is not a sanctions tool but a transit tariff, a distinction that investors and market analysts are likely to note.
The proposal has not been implemented and remains a campaign promise, but its potential consequences for global shipping costs are significant: if Trump returns to office, costs through the Gulf could spike overnight.
A Campaign Pledge With Global Implications
Trump’s business background has long informed his transactional approach to foreign policy. According to Forbes in 2024, his net worth stands at $2.5 billion, derived from real estate, licensing, and media ventures. The “America First” doctrine that guided his presidency from January 20, 2017, to January 20, 2021, reflects that perspective.
The Strait of Hormuz toll fits within that framework, aiming to impose economic pressure on Iran while signaling a willingness to confront adversaries through direct financial levers rather than traditional diplomatic channels. For global markets, the bottom line is a direct hit on a chokepoint handling a substantial portion of the world’s seaborne oil and liquefied natural gas bound for Europe and Asia.
The strait’s strategic importance has made its vulnerability a recurring concern throughout U.S.-Iran tensions. Historically, Iran has occasionally threatened to disrupt shipping in response to geopolitical pressures, though the waterway remained open during past Middle East conflicts. Any prolonged disruption could trigger widespread supply shortages and economic shockwaves far beyond the region, making Trump’s proposal a matter of immediate interest for energy markets and allied governments.
A History of Confrontation With Iran
Trump’s record with Iran is defined by escalation. In May 2018, he withdrew the United States from the Joint Comprehensive Plan of Action, the Obama-era nuclear deal he had long criticized as a “disaster” that gave Iran billions in sanctions relief without permanently blocking its path to a nuclear weapon.
The withdrawal was followed by the reimposition of sanctions on Tehran, part of a “maximum pressure” strategy Trump now proposes to restore. The most dramatic moment came on January 3, 2020, when Trump ordered a drone strike that killed Iranian General Qasem Soleimani, a move that brought the two countries to the brink of open conflict. The Strait of Hormuz toll proposal represents a new phase in that pressure campaign, one that would directly tax global trade transiting the waters off Iran’s southern coast rather than targeting Iranian financial institutions or oil exports alone.
The strait, bordered by Iran to the north and the Musandam Peninsula of Oman and the United Arab Emirates to the south, is the only sea route from the Persian Gulf to the open ocean, making its stability essential for regional and international commerce.
Political Context and Market Impact
Trump is currently a candidate for the 2024 Republican presidential nomination, and his campaign has centered on restoring the policies of his first term, including the maximum pressure strategy against Iran. He was impeached twice by the House of Representatives–first in December 2019 for abuse of power and obstruction of Congress related to Ukraine, and second in January 2021 for incitement of insurrection after the January 6 Capitol attack.
The Senate acquitted him both times. The Strait of Hormuz toll announcement, made roughly two weeks before the current date, is one of the most concrete economic proposals in his platform. For markets watching the 2024 race, the figure that matters is the 20 percent levy on one of the world’s most strategic waterways.
The proposal has not yet been implemented, but its potential impact is clear: global shipping costs through the Gulf could spike overnight if Trump returns to office. The strait’s role as a global energy lifeline means that any disruption, whether from a tariff or a blockade, would have consequences far beyond the region.
As the campaign continues, the proposal stands as a reminder of how a single candidate’s transactional approach to foreign policy could reshape the economics of global energy trade.
