On April 17, 2026, Iran reopened the Strait of Hormuz, ending roughly seven weeks of effective closure that had sent Brent crude to a peak of $118 per barrel and triggered a US naval blockade of Iranian ports. Within hours of the reopening, Brent dropped to approximately $83 per barrel — a decline of roughly 30% from the peak — as commercial vessel traffic began resuming through the strait. For US importers, the shift matters less at the tariff line and more across the shipping stack: ocean freight rates, bunker fuel surcharges, war risk insurance, and transit times should all begin normalizing in the coming weeks. The Section 122 (10%), Section 232 (50% steel/aluminum), and Section 301 (China) tariff layers, however, remain fully in force. This guide covers what happened, what changes for your landed costs, and what importers should do right now to capture the easing shipping environment.
What Happened: The Reopening
The Strait of Hormuz had been effectively closed to normal commercial shipping since late February 2026, when the US-Israel-Iran conflict began and Iran started charging transit tolls of up to $2 million per vessel. Trump announced a US naval blockade of Iranian ports on April 12 after Islamabad peace talks collapsed, which was declared 'fully implemented' by April 15. On April 17, Iran reopened the strait to commercial traffic, restoring passage for approximately 20 million barrels per day of oil — roughly 20% of the world's seaborne oil trade. The reopening came alongside renewed diplomatic activity, including a UK and France-led allied meeting on defensive maritime arrangements. Commercial vessel traffic began resuming within hours, and the oil market responded almost immediately: Brent crude dropped from peak levels near $118 per barrel to approximately $83 per barrel, a roughly 30% decline.
Oil and Energy Price Impact
The price collapse is the most visible consequence. Brent crude had surged from approximately $61 per barrel in January 2026 to peaks above $118 per barrel during the height of the Hormuz closure. With the strait reopened, the supply shock unwinds: Gulf producers that had shut in an estimated 9.1 million barrels per day of production in April can resume exports, and inventory concerns ease. US retail gasoline, which had climbed to $3.99 per gallon at peak, should drift lower over the coming weeks as the drop in crude works through the refining and distribution chain. Diesel, which hit $5.40 per gallon at peak, should follow a similar downward path. Petroleum-derived input costs — plastics (HTS Chapter 39), synthetic textiles (Chapters 54-55), chemicals (Chapters 28-38), rubber, and fertilizers — all face eased feedstock pressure, though the price pass-through from crude to finished petrochemicals typically lags by weeks or months.
Shipping Cost and Transit Time Impact
Vessels that had been rerouted around the Cape of Good Hope to avoid the Hormuz area can return to normal Strait of Hormuz and Suez Canal routing. That rerouting had been adding approximately 10-15 days to transit times for shipments from East Asia, South Asia, and the Middle East to US East Coast ports. As carriers return to shorter routes, transit times should shorten and effective global shipping capacity increases as vessels are freed from the longer rotation. Ocean freight rates should begin declining as emergency bunker adjustment factors and war risk surcharges get removed or reduced. Importers should not expect rates to drop to pre-crisis levels immediately — carriers typically lag on passing through cost declines, and some contracts will need to be renegotiated. But the direction is clear: shipping costs should be on a downward trajectory for the first time since late February.
War Risk Insurance and Surcharges
Marine cargo insurance and war risk premiums for vessels transiting the Persian Gulf, Gulf of Oman, and Arabian Sea had spiked during the blockade, with war risk rates reaching 1-3% or more of cargo value on affected routes. With the strait reopened and active hostilities subsiding, underwriters should begin reducing war risk premiums over the coming weeks. Importers with current shipments under elevated war risk rates should check with their insurance providers about potential adjustments to in-force policies. For future shipments, get fresh quotes — the rate environment is changing rapidly, and quotes from even a week ago may no longer reflect market levels.
What This Means for Landed Costs
The reopening affects shipping costs, not tariff rates. Total landed cost will decline for most importers, but the decline comes entirely from the freight, fuel, and insurance columns — the tariff layer is unchanged. For a typical import from Asia, the blockade-era landed cost premium came from three stacked factors: 10-15 day rerouting delays tying up working capital, carrier fuel surcharges tied to $118/bbl bunker fuel, and elevated war risk insurance. As each of those factors eases, landed costs should compress back toward pre-crisis baselines. Use the TariffsTool landed cost calculator with updated freight and insurance estimates from your forwarder to model your new cost picture. Do not simply assume that last month's quotes still apply — the market is moving quickly in both directions.
Tariff Situation Unchanged
The Hormuz reopening does not affect any US tariff rate. Section 122 remains at 10% on all countries and is still scheduled to expire approximately July 24, 2026 — from April 17, that is roughly 98 days away. Section 232 rates are unchanged: steel at 50%, aluminum at 50%, autos at 25%, copper at 50%, semiconductors at 25%, and lumber at 10%. The UK retains its 25% Section 232 steel/aluminum rate under the Economic Prosperity Deal. Section 301 tariffs on Chinese goods remain at 25-100% depending on the product category. The Section 122 expiration is now the most important deadline on the tariff calendar, and the reopening of Hormuz does not change that math. Importers planning purchases for July and beyond should still model the three Section 122 scenarios: expiration without replacement, Congressional extension at 10%, or higher permanent rates.
What Importers Should Do Now
First, renegotiate freight rates with your forwarders. Carriers that imposed emergency bunker adjustment factors and war risk surcharges should be lowering them — but often only if asked. Second, review any locked-in shipping contracts for adjustment clauses triggered by fuel or war risk changes; those clauses can work in your favor now. Third, recalculate landed costs with updated shipping and insurance estimates using the TariffsTool landed cost calculator, and use the scenario simulator to model what happens if Section 122 expires in July. Fourth, consider timing larger shipments now while rates are dropping — once rates fully normalize, carriers may raise base rates to recover margin. Fifth, monitor oil prices; further downside is possible as Gulf production ramps back up, but an unexpected escalation could reverse the reopening. Sixth, for products most exposed to petroleum-derived inputs (plastics, synthetic textiles, chemicals), check with suppliers about updated FOB pricing — feedstock cost declines take time to flow through factory quotes, but there should be meaningful relief on the next quotation cycle.
What to Watch Next
Three things matter most from here. First, whether the reopening sticks — diplomatic arrangements are fragile, and a collapse back into closure would reverse the price moves almost immediately. Second, how fast freight rates actually fall in practice; carrier discipline on the way down is typically slower than on the way up, and shipper pressure will matter. Third, the July 24 Section 122 expiration, which will now dominate tariff planning through the summer. Congressional action is needed before then to either extend the 10% rate, pass a replacement, or let it lapse. For the most current rates and analysis, use the TariffsTool country pages, the tariff calculator, and the landed cost calculator to model your specific supply chain against the new, lower shipping cost environment.
Key Takeaway
The Hormuz reopening is a meaningful relief for US importers — Brent crude down to $83/bbl, shipping rates beginning to ease, transit times normalizing, and war risk premiums set to decline. But the reopening does not touch the tariff layers: Section 122 (10%), Section 232 (50% steel/aluminum), and Section 301 (China) remain fully in effect. The net picture for landed costs is better than it was in early April, but still shaped primarily by the tariff stack. Use the easing window to renegotiate freight, update your landed cost models, and prepare for the July 24 Section 122 expiration decision.
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