Fixed or variable mortgage: how to choose

Choosing between a fixed and a variable mortgage is not a test of who can predict interest rates. It is a decision about which risks you are prepared to carry, how stable your budget is, and how likely your plans are to change before the term ends. A useful comparison starts with your real cash flow and contract, not a forecast.

What a fixed rate changes

A fixed rate stays the same for the mortgage term. If the contract uses level payments, the scheduled payment is predictable even when market rates move. That stability can make planning easier for a household with a tight monthly margin, a new property, or income that already varies for other reasons.

Predictability has tradeoffs. A closed fixed mortgage may have a more expensive prepayment penalty if you break the contract to sell, refinance, or change lenders before maturity. The calculation can depend on the lender and the contract. Portability, prepayment privileges and the method used to calculate a penalty can matter as much as the initial payment.

The Financial Consumer Agency of Canada explains that term length, open or closed status, portability and prepayment terms all affect the future cost of a mortgage. A fixed rate solves one kind of uncertainty, but it does not remove the need to read the rest of the agreement.

What variable can mean in practice

A variable rate can rise or fall during the term. The prime rate used by a lender is influenced by changes in the Bank of Canada's policy rate, but the lender sets its own prime rate and the discount or premium in your contract. The Bank of Canada publishes its policy-rate decisions and schedule, which is useful context, not a promise about what comes next.

There are also two payment structures commonly described as variable. With an adjustable payment, the required payment moves when the rate changes. With a fixed payment on a variable-rate mortgage, the payment may stay level for a time while the amount going to interest and principal changes. If rates rise enough, the payment may no longer reduce the balance as planned, and the lender may require an adjustment under the contract.

That distinction is important. Someone who can tolerate a changing rate may still be uncomfortable with a changing payment. Ask which part can move, when it can move, and what notice the lender provides.

Compare your budget, not a prediction

Start with the payment offered today, then model an uncomfortable but manageable increase. Suppose the initial payment fits at $2,300 per month. If a variable scenario moved it to $2,550, would the household still save, maintain an emergency fund and cover property costs? If that extra $250 would force the use of credit, the apparent flexibility may be too fragile for the current budget.

Then test the opposite tradeoff. If you choose fixed and need to move in eighteen months, what would the contract permit? Could the mortgage be ported to another property? How is the penalty calculated? Is there a way to make a lump-sum payment before the sale? The answer cannot be found in the rate alone.

The stress test used for qualification is not a personal budget. Passing it means the application meets a lending rule under the assumptions used. It does not show how a higher payment would affect childcare, maintenance, taxes, retirement savings or an irregular income month. Your own buffer should be based on those realities.

Term length and flexibility belong in the same decision

Rate type and term length are separate choices. A five-year fixed term is not the only way to obtain stability, and a variable mortgage is not the only way to retain flexibility. A shorter fixed term, an open mortgage or a portable contract may answer a specific need, each with its own cost.

Think about the events that could realistically happen before maturity. A planned move, a relationship change, parental leave, a business purchase, a major renovation or a likely refinance can make exit terms more valuable. If none of those is probable and payment certainty is the priority, a longer fixed term may fit. If cash flow has a wide buffer and the borrower accepts movement, variable may remain reasonable.

Prepayment privileges also deserve a dollar comparison. The right to increase regular payments or make annual lump sums is only valuable if you expect to use it. A feature-rich contract is not automatically useful, but a restrictive contract can be expensive when plans change.

Revisit the choice at renewal

The decision should be made again at every maturity date. Your remaining balance, income, equity and time horizon may be very different from when the mortgage started. Renewing into the same rate type by habit can preserve a solution to an old problem rather than address the current one.

Begin by reading the existing contract and the lender's renewal proposal. Compare the payment, term, prepayment rules, penalty method and switching costs. Our guide to the mortgage renewal letter explains how to treat that proposal as a starting point instead of a deadline-driven formality.

A renewal also creates a useful decision point for debts, renovations and future purchases. Those goals should be discussed before selecting a term because refinancing after signing can create avoidable costs.

A practical way to decide

Write down the maximum payment you could carry without using revolving credit. Note any likely sale, move or refinance before the term ends. Ask for the penalty formula, portability rules, prepayment privileges and the exact behaviour of a variable payment. Finally, compare at least two complete contracts on the same assumptions.

I work through those scenarios with the borrower's actual balance, budget and timeline. The goal is to make the consequences visible: what changes if rates move, what happens if the mortgage ends early, and which restrictions matter for the plans already on the calendar. You can also use the payment calculator to test monthly-payment scenarios before a conversation.

There is no rate type that is automatically right for every borrower. A sound choice is one whose payment risk and exit cost remain acceptable even if the forecast is wrong.

Certain conditions may apply. Subject to change without notice.