US Naval Blockade Cost Iran $25 Billion as Floating Oil Reserves Dry Up
US naval blockade against Iran reaches 173 cumulative days, causing $25 billion in oil revenue losses and a potential 25% economic contraction by 2027.
The economic pressure on Iran is intensifying following a 173-day cumulative naval blockade enforced by the United States, spanning two phases that began last April. According to reports, US assessments indicate oil revenue losses of approximately $25 billion, alongside severe disruptions to international trade, a growing foreign currency shortage, and a sharp surge in import and transport costs.
The blockade began on April 13 and lasted through its first phase until June 18, spanning 67 days. Following the collapse of temporary understandings between Washington and Tehran, operations resumed on July 14. As of October 28, the second phase has lasted an additional 106 days, bringing the cumulative total to 173 days. A US source familiar with Treasury Department assessments noted that the primary impact is gradually shifting from restricting oil tanker traffic to choking Iran's revenue streams, particularly after Tehran exhausted a significant portion of its floating oil reserves.
Data from the commodities tracking firm Kpler highlights the profound contraction of Iran's oil sector. Crude and condensate loading volumes plummeted from roughly two million barrels per day in March to between 220,000 and 255,000 barrels per day in August. No new shipments have been recorded since August 25. By October 22, Kpler reported that Iranian floating storage held outside the blockade zone was completely depleted, wiping out a reserve of approximately 88.8 million barrels that had allowed Tehran to sustain exports. Meanwhile, roughly 43 million barrels remain trapped inside tankers within the blockade zone.
Energy and sanctions researcher Omid Shokri explained that the exhaustion of floating reserves exacerbates the fiscal crisis due to Iran's heavy reliance on oil exports for foreign currency. The drop in dollar revenues directly impacts the exchange rate and production costs, compounded by war-related expenditures and damaged energy infrastructure. If the blockade persists, analysts estimate that Iran's crude and condensate revenues could drop to zero by mid-December.
Land Routes and Transport Surge
The blockade's fallout extends far beyond ports and maritime shipping. Iran's attempt to reroute goods overland has triggered severe congestion at border crossings with neighboring countries. By late September, approximately 17,000 trucks were backed up at borders with Turkey, Afghanistan, and Azerbaijan, with wait times reaching up to 20 days at certain checkpoints.
Transport costs have soared as a result. According to estimates from the Iran-China Joint Chamber of Commerce, shipping a container from China to Iran overland costs approximately $12,000, compared to roughly $3,000 via maritime transport—a fourfold increase. A widespread transition to overland freight could add an estimated $18 billion annually to the Iranian economy's transport expenses.
US Treasury Secretary Scott Bessent presented a stark forecast regarding the future of the Iranian economy. In an interview with Iran International, Bessent projected that Iran's economy could contract by more than 25% between March 2026 and March 2027, warning of impending fuel shortages and a severe crunch in state revenues as the maximum pressure campaign continues.
