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How Fixed Mortgage Rates Are Priced: The Bond Connection
May 11, 2026 | Posted by: Jamie Small - Ottawa Mortgage Broker
If you've been following mortgage rates closely, you may have noticed something curious: fixed rates can swing significantly even when the Bank of Canada hasn't touched its policy rate. While most Canadians know that variable mortgage rates follow the Bank of Canada's overnight rate, fewer understand that fixed mortgage rates march to a different drummer—government bond yields..png)
Why Bond Yields Matter
When a lender issues a fixed-rate mortgage, they're committing to lend money at a set rate for years, often five years in Canada. To do that safely, they need predictable, long-term funding that matches the mortgage's duration. Instead of relying on short-term deposits that can fluctuate, lenders turn to capital markets and rely on instruments like Government of Canada bonds, Canada Mortgage Bonds (CMBs), and other fixed-income securities. These instruments behave similarly in duration and risk structure to the mortgages themselves.Government of Canada bonds serve as the risk-free benchmark in Canada. Their yields reflect inflation expectations, the economic outlook, and anticipated monetary policy actions. Because they represent the safest debt available, everything else in the fixed-income market is priced relative to them.
The Pricing Formula
When lenders price a fixed mortgage, they essentially ask: 'What does it cost us to borrow money for five years in the market?' The answer is the five-year Government of Canada bond yield plus a spread. That formula looks like this:Bond Yield + Spread = Mortgage Rate
The spread covers credit risk (the chance a borrower defaults), liquidity risk, operating costs, and the lender's profit margin. For example, if the five-year bond yield is 3.18% (as it was on May 7, 2026) and the typical spread is 1.20% to 2.00%, the resulting mortgage rate would land somewhere between 4.38% and 5.18%.Why Rates Track Bonds So Closely
Because lenders constantly hedge and fund mortgages through capital markets, they respond quickly to changes in bond yields. If bond yields rise, funding costs rise, and mortgage rates climb. If bond yields fall, funding gets cheaper, and mortgage rates drop. Competition forces lenders to adjust pricing promptly—if one lender doesn't move with the market, others will price more competitively based on current yields.In Canada, the five-year fixed mortgage is the dominant product, so lenders primarily watch the five-year Government of Canada bond yield. That yield has become the key pricing benchmark for the industry.
When the Relationship Shifts
Mortgage rates don't perfectly mirror bond yields because the spread between them can widen or narrow. A widening spread—when rates rise more than yields—typically happens during periods of market stress, heightened credit risk concerns, or reduced competition. Conversely, a narrowing spread—when rates rise less or fall faster—occurs in environments of strong competition and stable credit conditions..png)
The Bottom Line
Fixed mortgage rates in Canada follow government bond yields because mortgages are funded through the same capital markets as bonds, bond yields represent the true cost of fixed-term money, and lenders simply add a spread on top to cover risk and costs. When you watch the five-year Government of Canada bond yield, you're effectively looking at the foundation of fixed mortgage pricing.You can follow Government of Canada bond yields on MarketWatch to predict trends in mortgage rates.
For more guidance, contact me, Jamie Small your Ottawa, Ontario Mortgage Broker today.