Choosing between a variable and fixed rate mortgage is one of the most consequential financing decisions a Canadian rental property investor makes. Get it right and your carrying costs stay manageable through a rate cycle. Get it wrong and a single renewal can turn a cash-flowing property into a liability.
The decision looks different for a rental property than it does for a primary residence. Your mortgage payment is a business expense, the rate environment affects your DSCR directly, and you are often managing the decision across multiple properties simultaneously.
This guide covers how each product works, what the data says about long-term cost, and how to think about the choice given where Canadian rates are today.
How Variable Rate Mortgages Work
A variable rate mortgage is priced at a spread to the lender's prime rate, which tracks the Bank of Canada's overnight rate. When the BoC raises or cuts rates, your mortgage rate moves accordingly, usually within days.
There are two types of variable rate products in Canada. An adjustable rate mortgage (ARM) changes your actual monthly payment when the rate moves. A variable rate mortgage with a fixed payment keeps your payment constant but adjusts how much of each payment goes to interest versus principal. When rates rise sharply, a fixed-payment variable can hit its trigger rate, at which point the full payment covers only interest and the lender requires action.
For rental properties, adjustable rate mortgages are generally preferable because your cash flow model stays accurate. A fixed-payment variable creates a mismatch between what you budget and what is actually happening to your amortization.
How Fixed Rate Mortgages Work
A fixed rate mortgage locks your interest rate for the term, typically one to five years in Canada. Your payment does not change regardless of what the BoC does. At renewal, you negotiate a new rate at whatever market conditions exist at that time.
Fixed rates are priced off Government of Canada bond yields rather than the overnight rate, so they can move independently of BoC decisions. A five-year fixed rate can rise even during a period of BoC rate holds if bond markets reprice inflation or growth expectations.
The prepayment penalty for breaking a fixed rate mortgage early is typically calculated using the interest rate differential (IRD) method, which can result in penalties significantly larger than those on variable rate mortgages. For investors who may need to sell or refinance before term end, this is a meaningful risk.
The Historical Cost Comparison
Canadian research spanning several decades consistently shows that variable rate borrowers pay less interest over time than fixed rate borrowers in the majority of rate environments. This is partly because lenders price a risk premium into fixed rates to compensate for the certainty they are providing.
However, the 2022 rate cycle demonstrated the limits of that historical pattern. Investors who held variable rate mortgages through the BoC's rapid tightening cycle saw their rates increase by more than 400 basis points in under two years, dramatically compressing cash flow on properties acquired at low rates with thin margins.
The historical advantage of variable holds over long horizons, but the path matters for cash flow. A temporary rate spike that takes a property cash-flow-negative for 18 months is a real operational problem even if rates eventually fall back.
Rate Comparison: What to Look For
| Factor | Variable Rate | Fixed Rate |
|---|---|---|
| Rate benchmark | BoC overnight rate (via prime) | GoC bond yields |
| Payment stability | Changes with rate (ARM) or at trigger | Fixed for full term |
| Prepayment penalty | 3 months interest (typically) | IRD or 3 months interest (higher of) |
| Break flexibility | Lower cost to exit early | Can be very expensive mid-term |
| Cash flow predictability | Lower — varies with BoC | Higher — locked for term |
| Historical total cost | Lower over most long periods | Higher but more predictable |
How the Decision Differs for Investment Properties
Cash Flow Margin Matters More
A primary residence borrower can absorb a rate increase by cutting discretionary spending. A rental property cannot. If your monthly payment rises by $400 and your rent is fixed by a lease, that $400 comes directly out of your cash flow. Properties with thin margins are far more sensitive to variable rate movement than properties with strong coverage ratios.
Run your deal through a stress test at the current variable rate plus 150 and 200 basis points before choosing variable. If the property goes cash-flow-negative at either scenario, variable rate financing carries real operational risk, not just theoretical interest cost risk.
Portfolio Size and Concentration
A single-property investor who takes a variable rate is making one bet. An investor with five variable rate properties is making the same bet five times simultaneously. Portfolio-level rate risk concentration is worth considering as you scale. Many experienced investors deliberately mix fixed and variable across their portfolio to hedge against both scenarios.
Renewal Timing and Refinancing Plans
If you plan to sell or refinance within the term, variable rate mortgages are almost always cheaper to exit. IRD penalties on fixed rate mortgages have surprised many investors who assumed they could break their mortgage without significant cost. Confirm the penalty calculation method with your lender before signing any fixed rate commitment on an investment property.
Where Canadian Rates Are Today
After the aggressive tightening cycle of 2022 and 2023, the Bank of Canada moved into an easing cycle through 2024 and into 2025. As of mid-2026, prime rate has come down meaningfully from its peak, and the spread between five-year fixed and variable rates has narrowed compared to the elevated-rate period.
In a rate environment where the BoC has already cut significantly and further cuts are more limited, the historical variable rate advantage may be smaller in the near term than it was during falling-rate periods. Fixed rates that lock in near the bottom of a cycle can outperform variable if rates stay flat or rise again.
No one consistently predicts rate direction correctly. The more reliable framework is to stress test both scenarios against your specific property's cash flow and make the decision based on how much payment volatility your deal can absorb, not on a rate forecast.
A Practical Decision Framework
Consider variable if: your property has strong cash flow coverage (DSCR above 1.25 at the current variable rate), you have cash reserves to absorb a 150 to 200 basis point increase, you may sell or refinance before the term ends, and you are comfortable with payment movement.
Consider fixed if: your property has thin margins that a rate increase would stress, you want certainty for budgeting across a portfolio, you are near retirement or otherwise dependent on predictable cash flow, or you are in a period where fixed rates are priced close to or below variable rates.
For most investors with a growing portfolio, a mix of both across different properties and renewal dates is a more resilient structure than an all-in bet on either direction.
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See how variable vs fixed affects your property's cash flow
Model both rate scenarios against your actual numbers before you commit. Free to start.
This post is for informational purposes only and does not constitute financial, legal, mortgage, or tax advice. Rate environments change frequently. Verify current rates, penalty structures, and product terms directly with a licensed mortgage professional before making any financing decision.