Iran reportedly attacked two commercial vessels in the Strait of Hormuz on October 14 using new tactics, according to Reuters, and Brent crude briefly topped US$107 a barrel in early trading before closing at US$106.06. IMF PortWatch recorded two transits through the strait on October 11, against a pre-crisis baseline of 85 a day. For a Canadian investor the headline matters less than the mechanism: the closure holds a risk premium in the oil price, and that premium reaches a portfolio through energy earnings, through inflation and through the interest rate path at the same time.
How the Premium Reaches Canadian Earnings
Canadian producers are price takers. They sell a barrel at a price set in global markets, so a supply shock thousands of kilometres away lands directly in their operating profit. Deloitte reports that operating profits at Canadian oil producers rose 68% between the first and second quarters of 2026.
West Texas Intermediate closed at US$95.09 on October 14, which is 38.7% above its July 1 close of US$68.58 and above the US$90 average that Deloitte projects for 2026. The iShares S&P/TSX Capped Energy ETF closed at $30.55 on October 14, up 6.1% from $28.79 on October 2 and up 27.3% from $24.00 on July 2. A holder of a broad Canadian index owns part of this exposure by default. The same premium raises prices at the pump, which is why Continuum Economics expects Canadian headline inflation to hold at 3.0% when September data arrive on October 19.
West Texas Intermediate has risen from US$68.58 on July 1 to US$95.09 on October 14, and it now sits above both Deloitte price assumptions, the US$90 average for 2026 and the US$76.50 average for 2027.
The dashed lines mark Deloitte average WTI assumptions of US$90 for 2026 and US$76.50 for 2027. WTI peaked at a close of US$105.83 on September 15.
Why Supply Cannot Respond Inside the Forecast Window
A price this high would normally call forth new supply, and in Canada it is not doing so quickly. Prime Minister Mark Carney announced on October 1 that the proposed Pacific Link pipeline, a 1 million barrel a day export line to the west coast, would be treated as a project of national interest with a single federal review. The target for finishing that review is September 1, 2027, and the estimated cost is C$35.2 billion to C$43.7 billion. The existing Trans Mountain pipeline carries 890,000 barrels a day and is already at capacity.
Capital spending shows the same caution. Statistics Canada capital expenditures rose about 7% to $11 billion in the second quarter, which Deloitte describes as modest movement, and drilling activity was up 17% from a year earlier according to Baker Hughes data cited by Deloitte. The Canadian gain from the Hormuz closure is therefore a gain in price and not in volume, and it lasts only as long as the premium lasts. Deloitte assumes WTI averages US$76.50 in 2027, which is US$18.59 below the October 14 close. The forecasters are treating the premium as temporary even as the strait stays shut.
Base Case and Tail Risks
The base case, in the judgment of this desk, is continued stalemate with oil volatile and elevated. Brent closed between US$104.72 and US$106.65 on each session from October 9 to October 14, and WTI has not closed above US$96 since September 18. The market is pricing a closed strait, not an escalating one.
The first tail risk is escalation beyond shipping. Saudi Arabia said an attack on an Aramco building in the east of the kingdom caused a limited fire, and that debris from intercepted Houthi missiles wounded four people in Riyadh. Damage to Gulf production capacity, as opposed to transit, would be a different shock. European gas is already near a four-year high, with Dutch TTF futures trading just above 86 euros a megawatt hour against a peak of 87.44.
The second tail risk is a reopening, and for a Canadian portfolio it is the one that is under-discussed. A move to the US$76.50 that Deloitte assumes for 2027 would be a 19.5% fall from the October 14 WTI close. Energy equities that rose 27.3% since July 2 would give back part of that, and the profit growth now supporting Canadian index earnings would shrink with it.
What a Canadian Portfolio Is Actually Long
The consequence is that a Canadian portfolio is long the war premium in one place and exposed to it in another. Energy earnings benefit from the price. Everything that is sensitive to interest rates pays for it, because oil lifts headline inflation and headline inflation shapes the rate path. The U.S. 10-year Treasury yield was 5.21% on October 13, the Federal Reserve raised its target range to 3.75% to 4.00% on September 16, and both the Fed and the Bank of Canada decide on October 28.
Three observable items will show which tail is getting closer: the daily transit count at the strait, the September Canadian CPI on October 19, and the Bank of Canada decision on October 28 with its Monetary Policy Report. A rise in transits from two a day would be the first signal of a reopening. A strike on Saudi infrastructure would be the first signal of the opposite.