WTI crude settled below $70 a barrel this week, its lowest level since before the Strait of Hormuz crisis began on February 28. Brent has fallen to a similar discount. The market has concluded that the worst of the supply disruption is over, and on the data available right now, that conclusion is reasonable.
The more important question for Canadian portfolios is not whether oil has priced the reopening correctly today. It is whether the structure underneath that reopening can hold for the eight weeks remaining before its central guarantee, toll-free passage, expires.
What Is Actually Reopening, and What Is Not
At least 20 tankers stranded in the Persian Gulf for more than three months have exited the strait since the deal took effect, carrying roughly 35 million barrels that had been stuck for the duration of the conflict. Confirmed oil shipments through Hormuz have risen to around 4.8 million barrels per day, the highest level since the war began.
That figure needs context. Before the conflict, roughly 15 million barrels per day exited the strait. Current flow is running at less than a third of that level, and the gap is not closing quickly. The central deep-water channel, the route capable of handling the largest tankers at scale, remains closed pending clearance of an estimated 80 naval mines, a process US officials estimate could take up to six months even on the faster end of projections.
What is moving today moves through narrower coastal routes hugging the Iranian and Omani shorelines, requiring 48-hour advance permits coordinated through Iran's Persian Gulf Strait Authority. This is functional but fragile: a route built on Iranian administrative cooperation rather than a fully demined, internationally guaranteed channel.
The Mechanism That Replaces the Current Calm
The June 17 memorandum guarantees toll-free passage for sixty days. That window closes around August 17. Iran's chief negotiator has stated plainly that Tehran intends to charge fees for vessels crossing the strait once the free period ends, and that the waterway will not return to prewar conditions.
The body designated to collect that toll, Iran's Persian Gulf Strait Authority, was designated by the US Treasury as an IRGC-linked Specially Designated National on May 27. Under US sanctions law, any payment to a Specially Designated National by a Western-affiliated entity is a prohibited transaction. This is the structural problem that oil markets have not yet been forced to price: the mechanism Iran intends to use to monetize the strait after August 17 is, under current US law, illegal for the shipping companies actually using it to pay.
This is not a remote scenario requiring an escalation to materialise. It is the default outcome of the current deal's own expiry date, absent a renegotiation neither side has yet begun.
Base Case Versus Tail Risk
The base case, and the one oil markets are currently pricing, is that the sixty-day window gets extended, renegotiated, or quietly replaced with an arrangement that avoids the sanctions collision, the same pattern of last-minute, partial fixes that has characterised this crisis since February. Diplomatic tracks rarely resolve cleanly on a calendar deadline, and there is real incentive on both sides to avoid reigniting a disruption that has already cost Iran an estimated hundreds of millions of dollars a day in lost trade at its peak.
The tail risk is a re-run of the pattern already seen twice this month: Iran briefly re-declaring the strait closed over a separate grievance, in this case the unresolved toll mechanism, while the underlying infrastructure, the uncleared mines, the narrow coastal-only routes, the IRGC permitting regime, makes a full closure easier to execute than the current calm suggests. The strait has already been declared closed and reopened multiple times since the June 17 deal without oil markets fully repricing each time, which is itself a sign that the market may be underweighting how unresolved the underlying mechanics remain.
Canada has joined France, the UK, Germany, Japan, and Italy in organising a defensive mine-clearance mission for the strait, a tacit acknowledgment from the G7 side that physical demining, not diplomatic language, is the actual bottleneck. The post-1991 Gulf War precedent, in which a similar multinational coalition required more than two years to declare the northern Gulf fully mine-free, is the realistic timeline against which the August 17 deadline should be measured.
Tanker traffic through the strait has recovered steadily since the June 17 deal but remains well below the daily volume seen before the conflict began.
Flow figures are approximate weekly composites derived from reported daily transit volumes. The prewar reference line of 15 million barrels per day reflects average flow before February 28, 2026.
The Realistic Portfolio Implication
This is not a call to position for a renewed energy shock. The base case, continued gradual reopening with periodic friction, remains more likely than a full re-closure, and Canadian energy and TSX exposure has already adjusted substantially to a lower, calmer oil price over the past month.
It is a case for treating August 17 as a real date on the calendar rather than background noise. A client whose portfolio review or rebalancing falls in the weeks immediately before that date should have the toll-mechanism sanctions collision specifically on the agenda, not because it is the likely outcome, but because it is the one outcome the market has done the least work pricing.