Stop Asking Where Rates Are Going and Calculate Your Actual Break Cost Instead
The Bank of Canada employs hundreds of analysts whose literal job is forecasting economic conditions, and in 2021 they projected overnight rates would hold steady through at least mid-2023. By July 2022 the overnight rate had already climbed to 2.50% (well above their forecast). By June 2023 it hit 4.75%. Professional forecasters missed the turn by a year and 475 basis points. Your mortgage broker, scrolling Bloomberg after their third closing of the day, is not running a superior model.
Yet the question persists. Where do you think rates are going? It's the wrong question, because it replaces a decision you can control with a bet you cannot win. The decision isn't whether rates will rise or fall. The decision is what you can afford to pay monthly and what it will cost you to get out of the contract early if your life changes. Both of those numbers are knowable today. One is printed in your lender's penalty disclosure schedule. The other is your bank balance.
What the Numbers Actually Tell You
A five-year fixed rate mortgage at a Big Six bank in September 2026 carries an Interest Rate Differential (IRD) penalty if you break early. That penalty is calculated as the greater of three months' interest or the IRD, which measures the bank's lost profit when you exit a below-market loan. If you locked in at 4.89% in 2024 and rates have since fallen to 3.94%, the IRD on a $600,000 balance could exceed $18,000. A variable-rate mortgage at the same bank, by contrast, carries a flat three-month interest penalty regardless of where rates have moved. On that same $600,000 balance at Prime minus 0.80%, the penalty is roughly $7,200.
The fixed rate protects you from payment shock if rates climb. The variable rate protects you from exit cost if you need to sell, refinance, or port the mortgage to a new property that doesn't meet the lender's portability criteria. Roughly 60% of Canadian borrowers break or renegotiate their mortgage before the end of a five-year term. That's not a niche scenario. That's the base case.
The real choice is "can I carry the higher payment if rates rise, and can I afford the penalty if I need out early."
The Penalty-Rate Paradox
Here's the part most borrowers miss: the better the fixed rate you negotiate today, the more expensive it becomes to leave tomorrow. If you lock in at 3.74% and market rates later drop to 3.44%, the bank's IRD calculation is based on that 30-basis-point gap across the remaining term. The savings you earned upfront become the penalty you pay on exit. The variable rate has no such trap. Your rate floats with the market, so the bank has no "lost profit" to claw back when you leave.
The fixed-versus-variable decision should hinge on two facts you can verify: your cash flow tolerance and your exit cost.
What You Can Control
If your household income is stable, you hate budgeting for uncertainty, and you have no plans to move or refinance before 2031, the fixed rate is buying you exactly what you need. If your income fluctuates, or if you're an investor planning to acquire more properties within the term, or if there's any chance you'll sell within three years, the variable rate is buying you liquidity. Neither is wrong. They're just optimized for different risks.
The variable rate is insurance against needing to break the mortgage early. The fixed rate is insurance against payment volatility.
Reframe the question. Don't ask where rates are going. Ask what happens if you're wrong, and whether you can afford that outcome. That number is in the fine print of your commitment letter. Read it before you sign.
The Bank of Canada employs hundreds of analysts whose literal job is forecasting economic conditions, and in 2021 they projected overnight rates would hold steady through at least mid-2023. By July 2022 the overnight rate had already climbed to 2.50% (well above their forecast). By June 2023 it hit 4.75%. Professional forecasters missed the turn by a year and 475 basis points. Your mortgage broker, scrolling Bloomberg after their third closing of the day, is not running a superior model.
Yet the question persists. Where do you think rates are going? It's the wrong question, because it replaces a decision you can control with a bet you cannot win. The decision isn't whether rates will rise or fall. The decision is what you can afford to pay monthly and what it will cost you to get out of the contract early if your life changes. Both of those numbers are knowable today. One is printed in your lender's penalty disclosure schedule. The other is your bank balance.
What the Numbers Actually Tell You
A five-year fixed rate mortgage at a Big Six bank in September 2026 carries an Interest Rate Differential (IRD) penalty if you break early. That penalty is calculated as the greater of three months' interest or the IRD, which measures the bank's lost profit when you exit a below-market loan. If you locked in at 4.89% in 2024 and rates have since fallen to 3.94%, the IRD on a $600,000 balance could exceed $18,000. A variable-rate mortgage at the same bank, by contrast, carries a flat three-month interest penalty regardless of where rates have moved. On that same $600,000 balance at Prime minus 0.80%, the penalty is roughly $7,200.
The fixed rate protects you from payment shock if rates climb. The variable rate protects you from exit cost if you need to sell, refinance, or port the mortgage to a new property that doesn't meet the lender's portability criteria. Roughly 60% of Canadian borrowers break or renegotiate their mortgage before the end of a five-year term. That's not a niche scenario. That's the base case.
The real choice is "can I carry the higher payment if rates rise, and can I afford the penalty if I need out early."
The Penalty-Rate Paradox
Here's the part most borrowers miss: the better the fixed rate you negotiate today, the more expensive it becomes to leave tomorrow. If you lock in at 3.74% and market rates later drop to 3.44%, the bank's IRD calculation is based on that 30-basis-point gap across the remaining term. The savings you earned upfront become the penalty you pay on exit. The variable rate has no such trap. Your rate floats with the market, so the bank has no "lost profit" to claw back when you leave.
The fixed-versus-variable decision should hinge on two facts you can verify: your cash flow tolerance and your exit cost.
What You Can Control
If your household income is stable, you hate budgeting for uncertainty, and you have no plans to move or refinance before 2031, the fixed rate is buying you exactly what you need. If your income fluctuates, or if you're an investor planning to acquire more properties within the term, or if there's any chance you'll sell within three years, the variable rate is buying you liquidity. Neither is wrong. They're just optimized for different risks.
The variable rate is insurance against needing to break the mortgage early. The fixed rate is insurance against payment volatility.
Reframe the question. Don't ask where rates are going. Ask what happens if you're wrong, and whether you can afford that outcome. That number is in the fine print of your commitment letter. Read it before you sign.
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