Canada headline inflation rose to 3.1% in September from 3.0% in August, while the Bank of Canada CPI-trim measure slipped to 1.8% from 1.9%, according to Statistics Canada and Bank of Canada data. The 1.3 percentage point gap is the widest in 13 months.
The gap is an energy story. Gasoline prices were up 27.8% from a year earlier, compared with 22.8% in August, and excluding gasoline the inflation rate slowed to 2.2% from 2.4%, as reported by Wealth Professional.
What the Core Measures Are Actually Saying
The Bank of Canada looks past the headline to measures that strip out noise, and all of them eased in September. CPI-trim fell to 1.8% from 1.9%, CPI-median to 1.9% from 2.0%, CPI-common to 2.4% from 2.6%, and CPIX to 2.2% from 2.4%, according to the Bank of Canada price index table.
Beneath those readings, food bought from stores slowed to 1.7% from 2.8%, and shelter rose to 1.8% from 1.5%, with rent unchanged at 2.8%. Mortgage interest cost was down 0.2% from a year earlier. Energy overall was up 19.0%.
CPI-trim has fallen from 3.1% in September 2025 to 1.8% without a single monthly increase, while headline inflation rose from 1.8% in February to a peak of 3.2% in May and has held near 3% since.
CPI-trim removes the most extreme price changes each month. In September headline CPI rose 0.1 point from August while CPI-trim slipped 0.1 point.
Why a Hike Is Still on the Table
The overnight rate stands at 2.25%, and the next decision falls on October 28. Reuters reported on October 19 that money markets expect a hold on that date while pricing a 25 basis point increase in December. Scotiabank Economics noted that pricing for an October hike had roughly doubled to about 18 basis points by Monday morning.
Earlier in the month the view was firmer. A report published October 7 by Benefits and Pensions Monitor said Scotiabank, UBS, Manulife and Oxford Economics each predicted a hike on October 28. KPMG Canada chief economist Ali Jaffery expects one 25 basis point increase on December 9, which would lift the rate to 2.5%, where he expects it to stay for the foreseeable future. KPMG had previously forecast no near-term hikes.
The case for acting despite soft core readings rests on two channels. Jaffery pointed to a weaker Canadian dollar, driven by the widening rate spread with the United States, which could speed inflation. The US Federal Open Market Committee raised its rate by 25 basis points at its September meeting, according to Canadian Mortgage Professional.
The Transmission to Fixed Mortgage Rates
The Government of Canada five-year yield neared 4% in early October, almost 100 basis points above its level a year earlier, with nearly 40% of that rise coming in the previous month, according to KPMG Canada. That yield anchors fixed mortgage pricing.
RBC economist Claire Fan said renewing borrowers "will likely already be feeling the squeeze from higher bond yields." Fixed-rate loans make up most Canadian household borrowing, so fixed-rate borrowers are paying more before the Bank of Canada moves, while variable-rate borrowers are insulated until it does. RBC expects the household debt service ratio to rise into 2027.
The October 28 decision therefore tests two readings of the same data. Core inflation at 1.8% and 1.9% argues for patience, while a gasoline-driven headline of 3.1% and a five-year yield near 4% mean much of the tightening has already reached households.