Two Different Channels, Two Different Benchmarks
Here is where the policy rate stops being abstract. The overnight rate is what the Bank sets. It does not set your mortgage rate directly, but it flows into borrowing costs through two separate channels that behave very differently.
The first channel is prime. The Financial Consumer Agency of Canada explains that lenders use the prime rate to set posted rates, and that variable-rate mortgages are typically priced as "prime plus" a spread. When prime moves, a variable borrower's rate moves the same amount. On a variable mortgage with fixed payments, a higher rate does not always change the payment immediately — instead, more of each payment goes to interest and less to principal, until the loan hits a trigger point that can force the payment up. That is why a steady policy rate still leaves many variable borrowers under quiet pressure.
The second channel is the bond market. Fixed mortgage rates are not built on the overnight rate at all; they track the 5-year Government of Canada bond yield. This is the single most misunderstood point in renewal season. You can watch the Bank hold its rate flat and still see fixed rates drift, because the two respond to different signals.
The prime and posted-rate figures above come from the Bank of Canada's posted-interest-rate series for July 2026, which held steady across the month. The takeaway is structural: a variable borrower is watching the Bank, while a fixed borrower is watching the bond market — and right now neither is sending a signal of imminent relief.