Canada headline CPI was 3.0% in August, but CPI-trim was 1.9% and CPI-median 2.0%, according to Bank of Canada data. A year earlier the picture was the mirror image: headline CPI was 1.9% in August 2025 while CPI-trim stood at 3.0%.
That inversion is the backdrop to the October 28 rate decision. The Bank of Canada policy rate is 2.25% after a seventh consecutive hold on September 2, and markets price at least one 25 basis point hike by year end.
What Is Driving the Headline
Gasoline prices rose 22.8% year over year in August, compared with 33.2% in May, 20.5% in June and 25.7% in July, according to Trading Economics summaries of the Statistics Canada release. Excluding gasoline, inflation was 2.2%. Energy prices are elevated because the Iran conflict, which began February 28, has disrupted Strait of Hormuz shipping for more than seven months.
Over the 12 months to August, headline CPI gained 1.1 percentage points while CPI-trim lost 1.1 points. Headline CPI rose from 1.9% to 3.0% and CPI-trim fell from 3.0% to 1.9%, with the lines crossing in March 2026 as gasoline inflation took hold.
Headline CPI has stayed above both core measures since March, with the gap to CPI-trim peaking at 1.2 points in May.
CPI-trim and CPI-median are seasonally adjusted Bank of Canada core measures; headline CPI is the 12-month change in the all-items index. The dashed line marks the Bank of Canada 2% inflation target.
Why the Bank Is Not Reading Core Alone
The case for patience is clear in the data. Core inflation is at the 2% target, and the Bank of Canada July Monetary Policy Report projected 2026 GDP growth of 0.7%. TD Economics still expects a hold.
The case for pre-emption rests on what core does not capture. Governor Tiff Macklem has said upside risks to inflation have increased, and in a September 21 speech in Halifax he said the Bank does not want to be late in raising rates. The Federal Reserve raised its policy rate 25 basis points to 3.75% to 4.00% on September 16, leaving the Bank of Canada at least 150 basis points below its US counterpart. The loonie traded near C$1.426 per US dollar on Wednesday after touching C$1.4293, an 18-month low, earlier in the week. A weaker currency raises import prices, which is a channel the core measures only register with a lag.
Market pricing reflects that second argument. The Government of Canada 2-year yield was 3.267% on Wednesday, 102 basis points above the policy rate, and the 10-year was 3.985%.
Three Dates Before the Decision
The Labour Force Survey on October 9 carries a consensus of 9,000 net new jobs. September CPI follows on October 19, with CPI-trim and CPI-median the readings that matter most. If both hold at or below 2.0%, the case for a hike rests on headline inflation and external pressure alone.
The Bank of Canada then announces its decision on October 28 alongside a Monetary Policy Report that introduces its new Prima forecasting model. Fixed-rate mortgage pricing follows the Government of Canada bond curve, where the market has already moved ahead of the Bank.