How Bond Yields Drive Fixed Mortgage Rates
When Canadians lock into a 5-year fixed mortgage, their lender is essentially borrowing money at the 5-year Government of Canada (GoC) bond yield and lending it back to you at a higher rate. The difference is called the mortgage spread — it covers the lender's cost of funds, credit risk, and profit margin.
Historically, the spread between the best 5-year fixed rate and the GoC 5-year bond yield has averaged 150–200 basis points (1.5–2.0%). When spreads narrow, lenders are competing aggressively for market share. When spreads widen, lenders are pricing in uncertainty or funding costs have risen.
Variable Rate vs. Fixed Rate — Different Drivers
Variable-rate mortgages are priced off the Bank of Canada overnight rate via the prime rate (currently Prime = 4.45%), while fixed rates track the bond market. These two rates can move independently:
- The BoC cut rates 7 times between June 2024 and January 2025, driving variable rates down sharply
- Fixed rates move on bond market expectations of future inflation and growth — often before the BoC acts
- In the current environment (2026), bond yields have stabilized, meaning fixed rates have plateaued even if the BoC makes further cuts
How to Read This Chart
| Line | What It Shows | Driven By |
|---|---|---|
| Best 5yr Fixed | Highly competitive rate aggregated from our tracked lenders | GoC 5yr bond yield + lender spread |
| GoC Bond Yield* | 5-year Government of Canada benchmark bond yield (approximate) | Inflation expectations, BoC policy, global bond markets |
| Variable Rate | Best variable-rate mortgage (Prime minus discount) | Bank of Canada overnight rate → Prime rate |
| Big Bank 5yr | Average posted 5yr fixed at the Big 6 banks | Same as best fixed, but with wider spreads |
What to Watch in 2026
With the BoC overnight rate at 2.25% and inflation near target, most economists expect the rate-cutting cycle to pause. Bond yields have priced in this view, which is why 5-year fixed rates have plateaued around 4.2–4.4% despite the variable rate falling to 3.80%.
Key events that could move rates in 2026:
- US tariff escalation — reduces Canadian growth outlook → BoC may cut further → bond yields fall → fixed rates follow
- Inflation re-acceleration — would force bond yields higher → fixed rates rise
- Housing market surge — stimulates lending demand → lenders widen spreads
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