March CPI at 2.4%: The Energy Shock Has Arrived in the Data. The Question Now Is Whether It Spreads.

Canada’s March CPI report, published April 20, tells a story that is simultaneously alarming at the headline and reassuring underneath. Headline inflation jumped from 1.8% to 2.4% in a single month, driven by the largest gasoline price surge in Canadian recorded history. But strip out gasoline and the picture looks almost normal: core inflation is running near 2.2%, the Bank of Canada’s preferred measures are around 2.3%, and there is no evidence yet that the energy shock has spread into the broader basket of goods and services that the Bank actually targets. The operative word is “yet.”

The Anatomy of the March Spike

Gasoline prices rose 21.2% on a month-over-month basis in March, a figure Statistics Canada described as the largest monthly gasoline price increase on record. The driver is unambiguous: the effective closure of the Strait of Hormuz following the U.S.-Israel strikes on Iran in late February disrupted approximately 20% of global seaborne oil supply, sending crude prices from roughly $72/barrel pre-conflict to above $115/barrel at peak before settling near $90/barrel currently. That crude price shock flows directly into Canadian pump prices with roughly a two-to-four-week lag, which is why March CPI captured the initial impact while February data, released before the full shock materialized, showed only early signs of pressure.

Fuel oil and other heating fuels rose 26.1% year-over-year in March, reflecting similar supply-chain dynamics. Shelter inflation ticked up to 1.7% from 1.5%, and recreation and education accelerated to 2.6% from 0.5%, partially reflecting higher transportation costs embedded in those categories. Food inflation decelerated to 4.0% from 5.4%, as the base-year effect from the GST/HST tax holiday unwound. March was the final month affected by that base-year distortion. From April onward, food inflation comparisons will be cleaner, though upward pressure from higher transportation and fertilizer costs related to the Hormuz disruption may begin showing in food prices over the coming months.

Why the Spread Question Matters

The Bank of Canada’s framework is designed to “look through” temporary supply shocks that do not feed into sustained inflation expectations. This is precisely what the Bank did during the early stages of the 2021 to 2022 inflation episode, before it became clear that what began as supply-side disruption had embedded itself in wages and services prices. Governor Macklem has explicitly flagged this distinction in recent communications: the energy price surge from the Hormuz disruption is, for now, treated as a temporary shock rather than a structural shift in the inflation regime. The data supports that framing, but conditionally.

The conditions that would force a reassessment are specific. First, services inflation: if higher transportation costs begin showing up in restaurant prices, hotel rates, and professional service fees, the shock is spreading beyond energy into the stickier components of the basket. Second, wage expectations: the March labour report showed average hourly wage growth accelerating to 4.7% year-over-year, though analysts note this figure may be distorted by compositional effects as lower-wage jobs disproportionately disappeared during the crisis period. If the April wage data confirms genuine acceleration rather than a compositional artifact, the Bank’s calculus shifts. Third, business pricing intentions: the Bank of Canada’s Business Outlook Survey, released April 20 alongside the CPI data, will show whether firms are planning to pass higher input costs through to customers. A meaningful uptick in firms reporting planned price increases would be the most direct leading indicator that second-round effects are developing.

The April 29 Decision and Its Stakes

The hold at 2.25% on April 29 is not in question. What is in question is the tone and content of the Monetary Policy Report. The January MPR projected GDP growth of approximately 1.1% for 2026 and inflation remaining near the 2% target. Both of those projections require significant revision. The energy shock has added direct inflationary pressure, complicated the trade environment, and introduced a new drag on household spending through higher fuel and food costs. The updated forecasts will tell the market whether the Bank sees inflation resolving quickly as Hormuz reopens or persisting into late 2026 in a way that requires policy response. That distinction is the most important input for fixed-rate mortgage pricing, GIC yields, and equity valuation in the months ahead.