Variable Mortgage Rate

A variable mortgage rate is a rate that moves with the lender's prime rate during the term. Lenders price it as prime plus or minus a set adjustment, so the spread is fixed at approval while the underlying rate can change whenever prime changes. The term fixes the length of the contract, not the rate.

How a variable mortgage rate is priced

Variable pricing begins with the Bank of Canada's policy interest rate, the target for the overnight rate used to guide short-term borrowing costs in the economy. When the central bank moves that target, commercial lenders normally pass the change into their prime rate, the benchmark they publish for consumer and business lending. Mortgage variable rates are then quoted as prime minus a discount, or occasionally prime plus a premium.

The discount is negotiated once, at approval, and is normally fixed for the whole term. Two borrowers can therefore hold the same prime rate and still pay different interest costs because their discounts differ. Lenders also publish a posted rate alongside a discounted rate; the posted figure is a reference point, while the discounted rate is what most borrowers are actually offered. Confirm the live figures with the lender or the Bank of Canada rather than relying on an older quotation.

Two structures exist. An adjustable-rate variable mortgage recalculates the payment when prime moves, so the payment rises and falls with the benchmark. A static-rate variable mortgage holds the payment steady and instead changes how much of each payment covers interest versus principal, which shortens or lengthens the effective amortization. Both track prime; they differ in where the adjustment lands.

What moves the rate, and what does not

Only a change in the lender's prime rate changes a true variable rate. Prime normally reacts to the Bank of Canada's policy decisions, which are announced on a published schedule of fixed dates through the year. Lenders generally move together, but they are not required to match the central bank move for move, and a lender can adjust its own prime independently.

Government of Canada bond yields matter far more for fixed-rate pricing. Fixed mortgage rates are tied to the yield on Government of Canada bonds of similar maturity because funding is matched to that market. A variable rate is tied to short-term prime, so a large move in long bond yields can shift fixed rates while leaving variable rates untouched. A change in the lender's posted rate, or in the discount it offers, also changes the quoted price with no change in prime at all.

Who a variable rate typically suits

Variable pricing is generally considered by borrowers who are comfortable with a payment that can change, who have room in the budget for a higher payment, and who value flexibility on penalties. It is also common among borrowers who expect rates to stay flat or decline, although no one can know that in advance and no rate forecast is guaranteed.

It tends to be a poorer fit for a household on a tight budget where any payment increase would be difficult, for a borrower who needs a fixed payment for planning, or for someone who intends to keep the mortgage to the end of the term and wants certainty of cost. The federal mortgage stress test applies to variable-rate borrowers: qualification is based on the greater of the contract rate plus a set number of percentage points and a published minimum qualifying rate. Confirm the current formula with OSFI or the lender.

How it compares with adjacent terms

The usual comparison is against a fixed-rate mortgage of the same term, and against a shorter fixed term.

Structure	How the rate behaves	Payment behaviour	Where it often fits
Variable, adjustable payments	Tracks prime	Payment moves with prime	Borrowers with payment flexibility who want to track the benchmark
Variable, static payments	Tracks prime	Payment stays level; amortization absorbs the change	Borrowers who want a stable payment with variable pricing
Fixed, comparable term	Locked for the term	Payment stays level	Borrowers who want cost certainty
Hybrid	Split fixed and variable portions	Blended payment	Borrowers who want to split the difference
Short fixed term	Locked, then repriced soon	Payment level until renewal	Borrowers who want certainty but expect to renegotiate soon

Renewal, conversion, and breaking the term early

At the end of the term the mortgage comes up for renewal. The lender offers a new rate and term, and the borrower can accept, negotiate, or move the mortgage to another lender, subject to re-qualifying and to any discharge or transfer costs. Because a variable product has no fixed rate to compare against, renewal pricing is essentially a fresh negotiation.

Many variable products are convertible, meaning the borrower can switch to a fixed rate of the same or a longer term with the same lender without triggering a penalty. That is a structural feature of the product rather than a market call, and it should be confirmed in the contract. If the mortgage must be broken early, for a sale, a refinance, or a lender switch, variable penalties are usually calculated as a set number of months of interest rather than an interest rate differential, so the charge is typically smaller than on a comparable fixed mortgage. Ask for the exact penalty wording before signing.

What to check before choosing a variable rate

• Whether payments are adjustable or static, and how the lender handles a prime increase.
• The size of the discount off prime and whether it is guaranteed for the full term.
• Conversion rights to a fixed rate, and whether conversion happens at the posted or the discounted rate.
• Prepayment privileges, the break-penalty formula, and whether the mortgage is closed or open.
• Whether interest is compounded semi-annually, the standard for Canadian mortgages.
• The current policy rate, prime rate, and the Bank of Canada's published conventional mortgage rate series, checked directly at the source.

Run the scenarios with a fixed vs variable calculator across a range of rate paths rather than a single forecast, and compare total cost over the term rather than the starting payment alone.