Many Canadians assume that fixed mortgage rates in Canada move directly with the Bank of Canada’s overnight rate. While that is generally true for variable-rate mortgages, fixed rates work differently.
Fixed rates are influenced primarily by the bond market, and bond markets respond to economic conditions not only in Canada, but around the world.
Understanding this difference can help you make a more informed decision when choosing between a fixed and variable mortgage.
Fixed and Variable Mortgage Rates Don’t Move the Same Way
Variable mortgage rates are tied to a lender’s prime rate. Prime usually changes when the Bank of Canada raises or lowers its overnight lending rate.
Fixed mortgage rates, however, are generally connected to Government of Canada bond yields. The five-year Government of Canada bond yield is particularly important because it influences the cost of funding many fixed-rate mortgages.
This means the Bank of Canada can hold, or even reduce, its overnight rate while fixed mortgage rates move higher.
That sometimes surprises borrowers.
What Is a Bond Yield?
A government bond is essentially a loan made by an investor to the government. In exchange, the investor receives interest.
Bonds are bought and sold in financial markets, and their yields change according to investor demand and expectations on the economy.
When bond yields rise, it becomes more expensive for lenders to fund fixed-rate mortgages. Lenders will generally respond by increasing the rates they offer to borrowers.
When bond yields fall, lenders may have room to reduce fixed mortgage rates, but the change is not always immediate or equal.
What Causes Bond Yields to Rise?
Several factors can push Canadian bond yields and fixed mortgage rates higher.
1. Inflation concerns
Inflation reduces the future purchasing power of money. When investors expect inflation to remain elevated, they typically demand a higher return for lending money over several years. Higher expected inflation can therefore lead to higher bond yields and, eventually, higher fixed mortgage rates.
2. Government borrowing and debt
Governments issue bonds to finance spending and refinance existing debt. When governments need to borrow significantly more money, the supply of bonds increases. Investors may demand higher yields to purchase that debt, particularly if there are concerns about deficits, interest costs, or financial stability.
Although Canadian mortgages are connected most directly to Canadian bond yields, global debt markets are closely linked. Developments in the United States, Europe, Japan, and other major economies can also affect Canadian borrowing costs.
3. Economic growth
A strong economy can create upward pressure on wages, consumer spending, and inflation. Investors may then expect interest rates to remain higher for longer, causing bond yields to rise. On the other hand, signs of a weakening economy may cause investors to move money into safer government bonds. Greater demand for those bonds can push yields, and potentially fixed mortgage rates, lower.
4. Energy prices and geopolitical events
Canada and the global economy are sensitive to changes in oil and energy prices.
Wars, trade disruptions, sanctions, and interruptions to major shipping routes can increase transportation and production costs. If those costs contribute to inflation, bond investors may demand higher yields. This is one reason events occurring thousands of kilometres away can eventually affect the mortgage rate offered to a Canadian homeowner.
5. Developments in the United States
Canadian bond yields are heavily influenced by the U.S. Treasury market because the two economies and financial systems are closely connected.
If U.S. bond yields rise sharply, Canadian yields often face upward pressure as well. Investors compare returns across countries, so Canadian bonds remain competitive in the global market.
Why Don’t Mortgage Rates Match Bond Yields Exactly?
Bond yields are an important part of fixed-rate pricing, but they are not the only consideration.
Each lender must also account for:
- Funding and operating costs
- Credit and lending risks
- Competitive pressures
- Profit margins
- The type of mortgage and property
- Whether the mortgage is insured, insurable, or uninsured
- The borrower’s qualifications
- Prepayment privileges and other mortgage features
For this reason, a movement in bond yields does not always produce an identical movement in mortgage rates. Rates are likely to rise faster than they fall. When markets are volatile, lenders may build an additional cushion into their pricing to protect themselves against sudden changes.
What Makes Fixed Mortgage Rates Fall?
Fixed rates are more likely to decline when bond yields fall.
That can happen when:
- Inflation is moving sustainably lower
- Economic growth is slowing
- Investors expect future interest-rate cuts
- Demand for government bonds increases
- Financial or geopolitical uncertainty encourages investors to seek safer assets
- Competition among mortgage lenders becomes stronger
However, lower bond yields do not guarantee that every lender will immediately reduce its rates. Each lender has its own funding costs, lending targets, and pricing strategy, which are internally assessed and then set.
What Does This Mean When Choosing a Mortgage?
There is no single mortgage term or rate type that is right for everyone.
A fixed-rate mortgage provides predictable payments and protection from rate increases during the term. That stability may be valuable for someone with a tight monthly budget or a lower tolerance for uncertainty. For more on how renewals and refinancing decisions fit into your mortgage strategy, visit the Renewals & Refinancing page.
A variable-rate mortgage may initially be priced below comparable fixed rates, but the borrower is accepting the possibility that the lender’s prime rate, and potentially the payment or interest cost, could increase.
Your decision should consider more than today’s advertised rate. It should also reflect:
- Your monthly cash flow
- Your tolerance for changing payments
- Your plans for the property
- The likelihood of selling or refinancing before maturity
- Mortgage penalties
- Prepayment options
- Your financial reserves
- Your overall short- and long-term goals
Don’t Try to Perfectly Time the Market
Bond markets can change quickly as investors respond to economic reports, government decisions, and world events.
Trying to identify the exact bottom of the rate cycle is extremely difficult, even for economists and professional investors.
A better approach is to choose a mortgage that works for your finances today while giving you enough flexibility for what may happen next.
The lowest rate is not automatically the best mortgage. The right mortgage is the one that supports your budget, your overall plan, and your peace of mind. For a plain-language comparison of fixed and variable mortgages including how to assess which is right for your situation, see Fixed vs. Variable Mortgages: Which One Should You Choose?.
If you are purchasing, renewing, or considering a refinance in Burlington, Oakville, or anywhere across Ontario, I can help you compare fixed and variable options, understand the risks, and choose a mortgage strategy that fits your life, not simply the latest rate headline.
This article is intended for general educational purposes and does not constitute financial advice. Mortgage products, rates, and qualification requirements are subject to change and will vary by lender and borrower.
