Why Mortgage Rates Change: Understanding the Bank of Canada, Bond Markets & Global Events

One of the most common questions I hear from clients is:

"Why did mortgage rates change when the Bank of Canada didn't announce anything?"

The answer is that not all mortgage rates move for the same reasons. Variable-rate mortgages and fixed-rate mortgages are influenced by different factors, and many of those factors originate well beyond Canada's borders.

Understanding how interest rates are determined can help you make better mortgage decisions and avoid reacting to headlines alone.

The Bank of Canada Controls Variable Mortgage Rates

The Bank of Canada (BoC) sets the overnight lending rate, which is the interest rate financial institutions charge each other for short-term borrowing.

When inflation is rising too quickly, the Bank of Canada often increases this rate to slow spending and borrowing. When the economy weakens, it may lower rates to encourage consumers and businesses to spend and invest.

Most Canadian lenders use the overnight rate as the foundation for determining their prime lending rate, which directly affects:

• Variable-rate mortgages

• Home equity lines of credit (HELOCs)

• Many lines of credit and floating-rate loans

For example:

If the Bank of Canada raises its policy rate by 0.25%, most lenders will increase their prime rate by approximately 0.25%, meaning borrowers with variable-rate mortgages typically see higher interest costs.

Fixed Mortgage Rates Follow the Bond Market

Many Canadians assume fixed mortgage rates are controlled by the Bank of Canada. They're not.

Fixed mortgage rates are primarily influenced by the Government of Canada bond market, especially the 5-year Government of Canada bond yield.

• When investors buy bonds, bond yields fall.

• When investors sell bonds, bond yields rise.

Since lenders fund many fixed mortgages using money tied to these bond yields, mortgage rates generally move in the same direction. That means fixed mortgage rates can increase or decrease weeks or even months before the Bank of Canada makes any changes.

This is why you'll sometimes see headlines like:

"The Bank of Canada held rates steady, but fixed mortgage rates increased."

Both statements can be true.

Why Does the Bond Market Move?

Bond investors constantly try to predict what the economy will look like over the next several years.

Some of the biggest influences include:

• Inflation reports

• Employment numbers

• GDP growth

• Consumer spending

• Government spending

• Oil prices

• Global conflicts

• Trade policies and tariffs

• Central bank decisions around the world

Markets don't wait for events to happen—they try to anticipate them. If investors believe inflation will remain high, they'll usually demand higher bond yields, pushing fixed mortgage rates higher. If they expect economic weakness or recession, they'll often buy bonds as a safe investment, causing yields and fixed mortgage rates to decline.

Why Global Events Matter

Canada doesn't operate in isolation. We're a trading nation, and our financial markets are closely connected to the United States and the global economy. Major events around the world can influence Canadian mortgage rates almost overnight.

The 2008 Global Financial Crisis

When the U.S. housing market collapsed and major financial institutions failed, economies around the world entered recession.

Central banks—including the Bank of Canada—slashed interest rates to stimulate borrowing and stabilize financial markets.

Government bond yields fell sharply as investors sought safe investments, causing fixed mortgage rates to decline significantly.

The COVID-19 Pandemic (2020)

When the pandemic shut down much of the global economy, uncertainty surged. The Bank of Canada quickly reduced its overnight rate to historic lows. At the same time, investors poured money into government bonds, pushing yields to record lows. The result was some of the lowest mortgage rates Canadians have ever seen.

Inflation Surge (2022–2023)

As economies reopened after COVID, supply chain disruptions, labour shortages, government stimulus, and strong consumer demand caused inflation to rise rapidly. To combat inflation, central banks aggressively increased interest rates. Bond yields climbed sharply as investors expected rates to stay higher for longer, and both variable and fixed mortgage rates rose to levels not seen in many years.

Trade Disputes and Tariffs

International trade tensions can also affect Canadian mortgage rates. Tariffs and trade restrictions can increase the cost of imported goods, putting upward pressure on inflation. They can also slow economic growth if businesses reduce investment or exports decline. Depending on which force is stronger—inflation or slower growth—bond markets and the Bank of Canada may react differently, causing mortgage rates to move even without changes in domestic economic conditions.

Why Mortgage Rates Sometimes Move Before the News

Financial markets are forward-looking. Investors don't simply react to today's economic data—they price in what they believe will happen months from now. For example, if economists widely expect inflation to fall over the coming year, bond yields may decline today, leading lenders to lower fixed mortgage rates before the Bank of Canada makes any official rate cuts.

Conversely, if markets expect inflation to accelerate, fixed mortgage rates can rise even while the Bank of Canada leaves its policy rate unchanged.

What This Means for Homebuyers

Trying to perfectly predict mortgage rates is nearly impossible. No one consistently knows what inflation, bond markets, geopolitical events, or central banks will do next. Rather than focusing solely on whether rates might move next week, it's more important to choose the mortgage that best fits your financial goals, cash flow, and risk tolerance. The "lowest rate" isn't always the best mortgage if it comes with restrictive terms, large penalties, or limited flexibility.

Mortgage rates are influenced by far more than the Bank of Canada.

Variable-rate mortgages are driven primarily by the Bank of Canada's overnight rate, while fixed mortgage rates respond to Government of Canada bond yields—which are constantly shaped by inflation, economic data, investor expectations, and global events.

Understanding these relationships can help you tune out the daily headlines and make informed, long-term financial decisions.

If you're wondering whether now is the right time to buy, refinance, or renew your mortgage, I'd be happy to walk you through today's market and help you choose the mortgage strategy that best fits your goals—not just today's interest rate.