A variable-rate mortgage is a home loan where the interest rate periodically adjusts based on a benchmark index, typically the lender's prime rate which follows the Bank of Canada's policy rate. This contrasts with a fixed-rate mortgage, where the interest rate remains constant for the entire term. In Canada, variable-rate mortgages are a common choice, accounting for about one-third of total outstanding mortgage debt as of recent years. Borrowers may choose this type of mortgage for its typically lower initial rates compared to fixed-rate loans, but they assume the risk that payments could increase if interest rates rise.
Definition and Basic Mechanics
A variable-rate mortgage is a loan where the interest rate is not fixed for the entire term but is periodically adjusted based on an underlying financial index. In Canada, the index is almost always the lending institution's own prime rate, which itself moves in lockstep with the Bank of Canada's target for the overnight rate. The mortgage interest rate is set as the prime rate plus or minus a predetermined margin. For example, a rate might be advertised as 'prime minus 1.00%'. If the prime rate is 4.45%, the mortgage interest rate would be 3.45%. The adjustment period, or how often the rate can change, is typically tied to changes in the prime rate, which can occur as often as every time the Bank of Canada adjusts its policy rate. The initial interest rate on a variable mortgage is often lower than the prevailing fixed mortgage rate, which is one of its main attractions. The margin, which is the fixed number of percentage points added to the index, remains constant over the life of the loan and is a key factor in determining the borrower's cost.
The most important basic features include the initial interest rate, the adjustment period linked to the index, the margin, and any interest rate caps. Caps are limits on how much the interest rate or payment can change, either at each adjustment or over the life of the loan, though they are less common in the Canadian market than in some other jurisdictions. Many Canadian variable-rate mortgages also offer a conversion clause, allowing the borrower to switch to a fixed-rate mortgage at designated times during the term, usually without a prepayment penalty. This feature provides a hedge against rising interest rates. Prepayment terms, which dictate any fees for paying off the mortgage early, are also a negotiated part of the contract.
How Variable-Rate Mortgages Work in Canada
In the Canadian market, variable-rate mortgages are directly tied to the lender's prime rate, which is influenced by the Bank of Canada's monetary policy. When the Bank raises or lowers its target for the overnight rate, commercial banks adjust their prime rates accordingly, usually by the same amount. This change is then passed on to borrowers with variable-rate mortgages almost immediately. This direct correlation makes variable-rate mortgages highly sensitive to central bank policy decisions aimed at managing inflation and economic growth.
There are two primary structures for payments on Canadian variable-rate mortgages. The first is a variable payment mortgage, where the monthly payment amount changes whenever the interest rate changes. If the rate goes up, the payment increases to cover the higher interest cost and maintain the original amortization schedule. The second, and more common type in Canada, is the variable-rate mortgage with fixed payments. Here, the monthly payment amount remains constant for a period, but the allocation between interest and principal changes. When rates rise, a larger portion of the fixed payment goes toward interest, slowing the pace of principal repayment. If rates fall, more of the payment goes toward principal, allowing the borrower to pay off the loan faster.
- The interest rate is set as the lender's prime rate plus or minus a margin.
- Rate changes are triggered by adjustments to the Bank of Canada's overnight rate.
- Two main payment types: variable payments or fixed payments.
- Borrowers can often convert to a fixed-rate mortgage during their term.
- Prepayment charges may apply if the mortgage is paid off early.
The prevalence of fixed-payment variable mortgages introduces a specific risk known as the trigger rate. This is the interest rate at which the fixed monthly payment covers only the interest due, with nothing left to reduce the principal. If rates rise above the trigger rate, the payment is insufficient to cover the accruing interest, leading to negative amortization where the mortgage balance actually increases. Lenders have protocols for when borrowers hit their trigger rate, which may involve requiring a lump-sum payment, increasing the monthly payment, or converting the mortgage to a fixed rate.
Historical Context and Popularity
Variable-rate mortgages have long been a fixture in the Canadian housing finance system. Their popularity fluctuates in relation to the interest rate cycle and the spread between variable and fixed rates. For much of 2021 and into early 2022, variable mortgage rates were substantially lower than fixed mortgage rates, leading many borrowers to opt for variable-rate products. This shift increased the share of outstanding mortgage debt held in variable-rate mortgages to about one-third, up from approximately 20% at the end of 2019. The historical preference for variable rates in Canada is partly driven by the structure of the banking system, where lenders fund long-term mortgages with shorter-term deposits, making variable rates a natural hedge against interest rate risk for the institutions.
The period following the global financial crisis saw historically low interest rates, which minimized the risks associated with variable-rate mortgages for over a decade. However, the rapid increase in the Bank of Canada's policy interest rate beginning in March 2022 brought the risks of variable-rate borrowing, particularly the trigger rate for fixed-payment mortgages, into sharp focus. Research from late 2022 estimated that about 50% of borrowers with variable-rate, fixed-payment mortgages had already reached their trigger rate at the prevailing mortgage rates of around 5.1%. This represented nearly 13% of all mortgages in Canada. The episode highlighted the sensitivity of these mortgage holders to monetary policy tightening.
Comparison with Fixed-Rate Mortgages
The fundamental difference between variable and fixed-rate mortgages lies in interest rate certainty. A fixed-rate mortgage locks in the interest rate for the entire term, commonly five years in Canada, providing predictable payments regardless of market fluctuations. A variable-rate mortgage offers no such certainty, as its rate moves with the lender's prime rate. This trade-off between risk and potential reward is central to the choice. Variable rates are typically priced below fixed rates at the outset. For example, as of 2026, the lowest available five-year variable rate was around 3.30%, compared to 4.09% for the lowest insured five-year fixed rate. This initial discount is the primary financial incentive for choosing a variable rate.
Over the long term, historical data suggests that borrowers often pay less interest with a variable-rate mortgage than with a fixed-rate one, because the lower average rate can outweigh the periods of higher rates. However, this outcome is not guaranteed and depends heavily on the path of future interest rates. Variable-rate mortgages transfer the interest rate risk from the lender to the borrower. While this can lead to savings if rates fall or remain stable, it exposes the borrower to payment shock if rates rise significantly. Fixed-rate mortgages, in contrast, protect the borrower from rising rates but often come at a higher initial cost and may involve higher penalties for breaking the mortgage early. The choice ultimately depends on the borrower's financial flexibility, risk tolerance, and outlook on interest rates.
Risks and Considerations for Borrowers
The primary risk of a variable-rate mortgage is payment uncertainty. If the Bank of Canada raises its policy rate, variable mortgage rates will increase, leading to higher monthly payments for those with variable payments, or a higher interest portion for those with fixed payments. In a rising rate environment, borrowers with fixed-payment variable mortgages face the specific risk of hitting their trigger rate, which can lead to negative amortization. Negative amortization means the loan balance grows because the payments are not covering all the accrued interest. This reduces the borrower's equity in their home and can extend the amortization period beyond the original schedule, sometimes even exceeding contractual limits such as 40 years.
Lenders have established procedures for managing these risks. When a borrower reaches their trigger rate or when negative amortization pushes the loan beyond its designated limits, the lender will typically contact the borrower to discuss options. These can include making a lump-sum payment to reduce the principal, increasing the monthly payment amount to cover the interest, or converting the mortgage to a fixed rate. Failure to take action may result in the lender unilaterally increasing the payment to bring the loan back on schedule. Borrowers should be aware of these potential outcomes and ensure their finances can accommodate higher payments. It is also prudent to understand the conversion options available, as locking into a fixed rate can provide payment stability if the rate outlook becomes unfavourable.
Current Rates and Market Conditions
Variable mortgage rates in Canada are dynamic and reflect the current monetary policy stance. As of late 2026, following a series of rate cuts between June 2024 and October 2025, the Bank of Canada held its overnight rate steady at 2.25%. This maintained the typical lender prime rate at 4.45%. Consequently, the lowest available five-year variable mortgage rate was approximately 3.30%. The spread between variable and fixed rates narrowed but remained, with the best insured five-year fixed rate at about 4.09%. The stability in rates through 2026 followed a period of significant increases earlier in the decade.
The future path of variable rates is inherently uncertain and depends on the Bank of Canada's assessment of economic conditions, particularly inflation. As of 2026, inflation was hovering around 3%, with factors like energy prices and tariffs adding upward pressure, which suggested the Bank might maintain its policy rate for an extended period. However, any weakening in economic activity could create room for future rate cuts. Borrowers considering a variable-rate mortgage must weigh the current rate advantage against the possibility of increases during their term. The decision often hinges on whether one believes rates are more likely to stay the same or fall, versus the risk that they will rise.
Conversion and Refinancing Options
Most variable-rate mortgages in Canada include a conversion clause, allowing the borrower to switch to a fixed-rate mortgage offered by the same lender at any time during the term. This internal conversion is usually straightforward, does not require requalification or a credit check, and does not incur a prepayment charge. However, the new fixed rate will be the lender's posted or discounted rate at the time of conversion, which may be higher than the variable rate being left behind. This option provides a valuable escape hatch if a borrower becomes concerned about rising rates and desires payment certainty. It is a defining feature that mitigates some of the risk of choosing a variable rate initially.
Alternatively, a borrower may choose to refinance their entire mortgage with a new lender to secure a fixed rate. This process involves a full mortgage application, including requalification under the current mortgage stress test rules, and will incur costs such as legal fees and potential prepayment penalties on the existing mortgage. Refinancing can be worthwhile if another lender offers a significantly more attractive fixed rate, but the costs and administrative burden are higher than a simple internal conversion. Before converting or refinancing, borrowers should carefully compare the new fixed payment with their current variable payment and assess whether locking in is financially prudent given the rate outlook and their personal circumstances.
Frequently asked questions
What is a variable-rate mortgage?
A variable-rate mortgage is a home loan where the interest rate changes periodically based on a benchmark index, which in Canada is almost always the lender's prime rate. The prime rate moves with the Bank of Canada's policy rate. Your mortgage rate is typically set as the prime rate plus or minus a fixed margin. This means your interest cost and, depending on your payment type, your monthly payment can fluctuate over the term of the loan.
What is the trigger rate on a variable mortgage?
The trigger rate applies specifically to variable-rate mortgages with fixed payments. It is the interest rate at which your fixed monthly payment only covers the interest due, with nothing left to pay down the principal. If rates rise above your trigger rate, you enter a state of negative amortization, where your loan balance increases. Lenders will typically contact you at this point to discuss options like increasing your payment, making a lump-sum payment, or converting to a fixed rate.
Can I switch my variable-rate mortgage to a fixed rate?
Yes, most variable-rate mortgages in Canada include a conversion clause that allows you to switch to a fixed-rate mortgage with the same lender at any time during your term. This process usually does not involve fees or a new credit application. You will receive the lender's current posted or discounted fixed rate at the time of conversion. You can also refinance with a new lender to get a fixed rate, but that involves a full new mortgage application and may incur costs.
Are variable mortgage rates lower than fixed rates?
Adjustable rate mortgages usually charge lower interest rates than those with fixed rates. According to scholars, borrowers should generally prefer adjustable-rate over fixed-rate mortgages, unless interest rates are low. The borrower benefits from reduced margins to the underlying cost of borrowing compared to fixed or capped rate mortgages. Many ARMs have teaser periods with an interest rate substantially below the fully indexed rate.
How do variable mortgage rates change?
Variable mortgage rates change based on an underlying index which reflects the cost to the lender of borrowing on the credit markets. The interest rate on the note is periodically adjusted using this index. Common indices include the London Interbank Offered Rate (LIBOR) and the 1-year constant-maturity Treasury (CMT) rate. The rate is typically set at the index plus a fixed margin specified in the loan agreement. For example, a mortgage rate may be LIBOR plus two percent. Consequently, as the index changes, the borrower's interest rate and payments may also change over time.
Sources and further reading
- Variable-rate mortgage (Wikipedia) en.wikipedia.org
- Current Mortgage Rates | RBC Royal Bank of Canada rbcroyalbank.com
- Variable Rate Mortgage | Scotiabank Canada scotiabank.com
- Find the best 5-year variable mortgage rates in Canada ratehub.ca
- Variable-rate mortgages with fixed payments bankofcanada.ca
- What is a variable rate mortgage? cibc.com
This article explains how things work and is not financial, tax or legal advice. Rules, limits and rates change, so check the current figures with the Canada Revenue Agency, your province or your financial institution before you act.