Iran loaded no crude at all in the Gulf in September 2026, the first blank month of the blockade1. Kharg Island, the terminal that handles the bulk of Iranian exports, had shipped 1.8 million barrels a day in March 2026, 890,000 in July under a temporary agreement, and 250,000 in August2. Sentinel satellite imagery caught no supertanker loading there for at least a fortnight to mid-September3.
The barrels have not stopped existing. About 86 million barrels of Iranian crude sit in floating storage, some 23 million of it trapped inside the Gulf4. At September's loading rate of nothing at all, none of those barrels is going anywhere. Iran owns the oil and cannot sell it, and storage on water costs money every day it continues.
That is a different kind of pressure from a production cut. A field shut in can be restarted and the loss stops accruing; a cargo afloat with no buyer keeps charging demurrage, keeps tying up a hull, and keeps the revenue that would defend the budget on the wrong side of the chokepoint. The blockade has not reduced what Iran has. It has converted it from income into inventory, which is why the fiscal effect arrives faster than the production figures suggest.
Nobody can measure the strait it has to cross either. Three trackers produced three answers that week: MarineTraffic counted 132 Hormuz transits in the week to 27 September, the IMF PortWatch dashboard recorded one transit on 27 September, and a brief drawn from vessel transponder data counted 135 ships holding position away from berth at 23:50 UTC on 30 September56. Trackers have split by an order of magnitude on this water before, and no one pricing a voyage can use the counts.
