Fixed Rates vs. Bond Yields: Why BoC Cuts Don't Always Help

“The Bank of Canada cut the rate, so my fixed-rate mortgage should drop today, right?”

Real talk: that’s a myth.

But why?

The Bank of Canada controls the overnight rate, which affects variable mortgages directly. Fixed-rate mortgages are a different animal — they’re priced off Government of Canada bond yields, not BoC announcements. Bond yields can rise even when the BoC cuts, which is exactly why fixed rates sometimes don’t budge despite what looks like good news.

The US influence

There’s a loose but real correlation between Canada’s 5-year bonds and the US 10-year Treasury. Our economies are tightly linked, so Canadian bond markets often react to American inflation and employment data before they react to anything happening at home. Lay the two charts side by side over time and the patterns are nearly identical. If you want a sense of where renewal rates might move, US economic trends are often the earlier signal.

A widespread misconception is that BoC decisions dictate all mortgage rates. In reality, fixed rates track 5-year bond yields, which respond to global forces — particularly US Treasury yields and employment numbers — regardless of what the BoC does with the overnight rate.

Banks take the elevator up and the stairs down. When bonds rise, lenders hike fixed rates almost instantly. When bonds fall, lenders are much slower to pass on the savings.

My renewal is soon — what do I do?

Right now, a lot of homeowners are choosing between peace of mind and market timing:

• 3-year fixed gives you immediate stability, essentially a bet that rates will be lower by the time you renew again in 2029.
• 5-year fixed stays popular because it locks in budget certainty for a full 60 months.

When is variable your best buddy?

Variable rates shine when the Bank of Canada is pausing or cutting. Your interest rate drops automatically as the BoC cuts, which can lower your payment over time without you having to do anything.

The breakeven math matters here: if a variable rate starts slightly above a comparable fixed rate, it often only takes a couple more BoC cuts to reach breakeven — after that, every additional cut is pure savings. And variable mortgages typically let you lock into fixed at any point during the term, so you keep the option open if fixed rates drop significantly.

If your renewal is coming up and you’re trying to decide between fixed and variable, let’s talk it through — the right call depends on your specific numbers, not just the headlines.