Homes & mortgages
Fixed vs variable: what can change in your mortgage?
Compare rate mechanisms, payment changes and contract questions without forecasting rates.
The key idea
A fixed rate stays the same during its term. A variable rate changes under the contract. With a variable mortgage, the payment may adjust or initially stay fixed while its interest and principal portions change.
Separate the rate from the payment
| Structure | What to check |
|---|---|
| Fixed rate | Rate stays fixed for the term; separate tax/insurance collections can still change. |
| Variable rate, adjustable payment | How and when the payment changes with the rate. |
| Variable rate, fixed payment | How rising interest reduces principal repayment, and what triggers a required change. |
The labels are a starting point. Read the lender’s actual mechanism, including the reference rate and any discount or spread. FCAC: choosing a mortgage
A fixed payment can hide a changing path
A trigger rate is reached when the payment covers interest only. If interest exceeds the payment, unpaid interest may add to the balance, depending on the contract. The lender may require a larger payment or another response. Ask for the trigger terms and what happens at renewal, not just today’s monthly amount. FCAC: interest rates and trigger rates
Compare flexibility and the cost of leaving
Prepayment privileges and penalties depend on the contract. Ask for a written penalty example if you sell, refinance or repay early. Do not assume variable always means a cheap exit, or that the lowest quoted rate has the best conditions. Open/closed terms, portability and lender approval are separate questions. FCAC: paying off your mortgage faster
Use capacity as well as preference
One household may prefer a known rate while still being unable to absorb the renewal increase later. Another may be comfortable with uncertainty but have a near-term move that makes exit costs important. Put payment changes alongside essentials, reserve needs and timing. No rate type eliminates all these risks.
See it in practice
Same payment, less principal repaid
Fictional monthly statement: a $1,500 payment contains $1,000 interest and $500 principal. If the interest portion becomes $1,300 while payment stays $1,500, principal repayment becomes $200. At $1,500 interest, no principal is repaid; above that, the payment would not cover interest. These are invented charges, not a Canadian mortgage interest calculation or a lender’s trigger quote. No taxes or fees are included.
Check your understanding
Is an unchanged payment proof that borrowing cost is unchanged?
No. More of that payment may be interest, leaving less principal repaid. Compare both the balance and payment.
A useful next step
- Ask what changes with the rate and when.
- Request the trigger/payment-change and prepayment clauses.
- Write a budget with a higher payment you choose for illustration, without assuming that scenario predicts rates.
Inspect the sources
Primary references checked September 18, 2026. A source check is not professional financial or legal review.
- FCAC: choosing a mortgageCurrent at check · Canada; contracts and lender regulation vary
- FCAC: interest rates and trigger ratesCurrent at check · Canada; contract-specific
- FCAC: paying off your mortgage fasterCurrent at check · Canada; contract-specific