Key Takeaway

When interest rates rise, your mortgage payment goes up. On a C$400,000 mortgage with a 25-year amortization, a one percentage point rate increase (from 3 per cent to 4 per cent) raises your monthly payment by roughly C$225. For Canadian homeowners, this impact hits hardest at renewal, when your mortgage term ends and you renegotiate at current rates, which may be substantially higher than your previous term.

How Interest Rates Affect Your Payment

Your mortgage payment consists mainly of principal (paying down the loan balance) and interest (the cost of borrowing). The interest portion is calculated on your outstanding balance at the rate set in your mortgage agreement. When your rate increases, more of each payment goes to interest, and if your payment amount stays the same, less goes to principal.

According to the Financial Consumer Agency of Canada, the relationship is direct: higher rates mean higher borrowing costs (FCAC, 2026). As covered in foundational finance texts such as Principles of Finance, the amortization formula ties payment size, loan amount, rate, and time together, so any change in rate shifts the payment amount required to retire the debt over the same period.

For a fixed-rate mortgage, your rate and payment stay constant during the term (commonly one to five years in Canada). For a variable-rate mortgage, your rate moves with the lender’s prime rate, which tracks the Bank of Canada policy interest rate, so payment changes can happen mid-term (Bank of Canada, 2026).

Real Examples: Rate Increases and Monthly Costs

Consider a C$400,000 mortgage with a 25-year amortization:

  • At 3.0 per cent, your monthly payment is roughly C$1,893.
  • At 4.0 per cent, the payment jumps to approximately C$2,106.
  • At 5.0 per cent, it rises to about C$2,331.

Each one-point increase adds C$200 to C$250 per month, or C$2,400 to C$3,000 annually. Over a five-year term, that difference compounds to tens of thousands in additional interest paid.

Smaller rate moves still matter. A half-point increase (50 basis points) on the same mortgage adds roughly C$110 to C$120 per month. For homeowners renewing in 2026 and 2027 after locking in rates of 2 to 3 per cent in 2021 and 2022, current rates of 5 per cent or higher represent a substantial payment shock.

Read also: How the Bank of Canada Interest Rate Shapes Your Mortgage in Canada

The Canadian Renewal Context

Canadian mortgages differ from the US 30-year fixed model. Here, the mortgage term (when the rate is locked) is typically much shorter than the amortization period. At the end of each term, you renew or refinance at prevailing rates. If rates have climbed since your last term, your payment rises at renewal, even though your principal balance is lower.

This structure means most Canadian homeowners face rate risk every few years. According to Ratehub, millions of mortgages are set to renew in 2026 and 2027, and many will see payment increases of 30 to 50 per cent compared to their previous term (Ratehub, 2026).

Variable-rate borrowers feel rate changes sooner, as their payments adjust when the prime rate moves. Some variable-rate products have a fixed payment with a floating rate, meaning higher rates extend your amortization instead of raising the payment immediately, but you still pay more interest over time.

What You Can Do

If you are approaching renewal and rates are higher, confirm your current mortgage balance, review your budget for the new payment amount, and compare offers from multiple lenders. You are not required to renew with your current lender, and shopping around can save you a fraction of a percentage point, which translates to real monthly savings.

If you have a variable-rate mortgage and rates have risen, consider whether switching to a fixed rate at renewal makes sense for your situation and risk tolerance. Prepayment privileges (the ability to pay extra principal without penalty during the term) can help reduce your balance and the interest you pay, though prepayment options vary by lender and product.

For personalized advice on rate negotiation, term length, or whether to lock in a fixed rate, consult a licensed mortgage broker or your financial institution. Mortgage rules, products, and qualifying rates differ by province and lender, and your eligibility and best option depend on your income, credit, property, and current mortgage terms.

Disclaimer: This article provides general educational information only and is not personalized financial, lending, legal, or tax advice. It is not an offer or commitment to lend. Mortgage products, rates, prepayment privileges, and eligibility vary by lender, province, and your individual circumstances. Rates change frequently; verify current terms with a licensed mortgage professional before making decisions. For advice specific to your situation, consult a licensed mortgage broker, the Financial Consumer Agency of Canada, or a qualified financial advisor.