Turn your mortgage into a wealth-building tool. Smith Manoeuvre strategies, tax-smart planning, and honest math from two Canadian mortgage strategists.
Shifting Your Mortgage to a Rental? Rerun the Numbers at 4.64% to 5.08%
A published guide on moving a mortgage from a home to a rental property quotes 3.89% as its rate assumption, and that figure no longer describes the market. As of September 29, 2026, nesto listed its lowest 3-year fixed insured mortgage rate at 4.64%, while the Big 6 banks averaged 5.08% on the same term. Every calculation in the older piece that sits downstream of 3.89% needs to be redone.
What the higher rate does to the arithmetic
The strategy rests on a simple idea. Interest on money borrowed to earn rental income is generally deductible. The aim is to have as much of your debt as possible attached to the rental, where the interest reduces your tax, and as little as possible on the home.
Take a homeowner with $300,000 of debt moved onto the rental. Interest in the first year, before any principal is repaid, comes to:
At 3.89%: $11,670
At 4.64%: $13,920
At 5.08%: $15,240
That is $2,250 to $3,570 more per year for the same balance. The deduction grows alongside it, which is why the strategy still holds up. But a larger deduction is not a free one. Assume a combined marginal tax rate of 30% (an assumption, since yours depends on your income). The after-tax interest cost is then $8,169 at 3.89%, $9,744 at 4.64%, and $10,668 at 5.08%. The tax benefit softens the increase without erasing it, and the old article's projected carrying costs were too low by roughly $1,500 to $2,500 a year on this example.
Qualifying is the second place the rate shows up
A lender does not test you at the rate you will pay. Under the OSFI stress test, you qualify at your contract rate plus 200 basis points (two percentage points), or 5.25%, whichever is higher (Bond Yield Watch, as of 2026-09-22). At 3.89%, that test rate was 5.89%. At 4.64% it is 6.64%, and at 5.08% it is 7.08%.
A higher test rate means a given income supports a smaller loan. Rental income helps here, though less than many people assume. Lenders counted toward qualification only 50 to 80% of rental income (Canadian Mortgage Trends, as of 2026-08-15). On $2,000 of monthly rent, that is somewhere between $1,000 and $1,600 working in your favour, and which end you land on depends on the lender.
That spread deserves attention. Two lenders can look at the same property and the same tenant and reach different borrowing limits, so the first quote you receive tells you less than the difference between two or three.
Where the structure still makes sense
Higher rates do not change the logic of the strategy. They change the margin for error. At 3.89%, a rental that roughly covered its own costs had some cushion. At 5.08%, the same rental may be carrying more of its own interest than the numbers suggested a few years ago, and a vacancy of even two months weighs more heavily on the result.
A few inputs are worth rebuilding from scratch rather than adjusting:
The interest rate on the portion moved to the rental, across the 4.64% to 5.08% range.
The stress-test rate, which now sits well above the 5.25% floor.
The share of rent your lender will actually count, somewhere between 50% and 80%.
Your own marginal tax rate, which determines what the deduction is worth.
If the numbers still work with those four inputs, the strategy remains sound. You should learn before signing anything whether the numbers only worked at 3.89%.
One caution on the tax side: deductibility follows how the borrowed money is used, so the paper trail matters as much as the rate. How the funds move between accounts, and what they are spent on, should be documented clearly enough that an accountant can follow it.
The old article was right about the method
The method in the earlier piece still stands. Only the input has aged, and a single stale number runs through every figure built on top of it. Rerunning the calculation at today's rates takes an afternoon with a lender's quote and your last tax return, and it is the kind of work where a mortgage professional and an accountant looking at the same file catch what each would miss alone. If you'd like to see your own numbers laid out at the current range, I'm glad to walk through them with you.
Bond Yield Watch - Under the OSFI stress test, you qualify at your contract rate plus 200 basis points (two percentage points), or 5.25%, w - 2026-09-22. https://bondyieldwatch.ca/
A published guide on moving a mortgage from a home to a rental property quotes 3.89% as its rate assumption, and that figure no longer describes the market. As of September 29, 2026, nesto listed its lowest 3-year fixed insured mortgage rate at 4.64%, while the Big 6 banks averaged 5.08% on the same term. Every calculation in the older piece that sits downstream of 3.89% needs to be redone.
What the higher rate does to the arithmetic
The strategy rests on a simple idea. Interest on money borrowed to earn rental income is generally deductible. The aim is to have as much of your debt as possible attached to the rental, where the interest reduces your tax, and as little as possible on the home.
Take a homeowner with $300,000 of debt moved onto the rental. Interest in the first year, before any principal is repaid, comes to:
That is $2,250 to $3,570 more per year for the same balance. The deduction grows alongside it, which is why the strategy still holds up. But a larger deduction is not a free one. Assume a combined marginal tax rate of 30% (an assumption, since yours depends on your income). The after-tax interest cost is then $8,169 at 3.89%, $9,744 at 4.64%, and $10,668 at 5.08%. The tax benefit softens the increase without erasing it, and the old article's projected carrying costs were too low by roughly $1,500 to $2,500 a year on this example.
Qualifying is the second place the rate shows up
A lender does not test you at the rate you will pay. Under the OSFI stress test, you qualify at your contract rate plus 200 basis points (two percentage points), or 5.25%, whichever is higher (Bond Yield Watch, as of 2026-09-22). At 3.89%, that test rate was 5.89%. At 4.64% it is 6.64%, and at 5.08% it is 7.08%.
A higher test rate means a given income supports a smaller loan. Rental income helps here, though less than many people assume. Lenders counted toward qualification only 50 to 80% of rental income (Canadian Mortgage Trends, as of 2026-08-15). On $2,000 of monthly rent, that is somewhere between $1,000 and $1,600 working in your favour, and which end you land on depends on the lender.
That spread deserves attention. Two lenders can look at the same property and the same tenant and reach different borrowing limits, so the first quote you receive tells you less than the difference between two or three.
Where the structure still makes sense
Higher rates do not change the logic of the strategy. They change the margin for error. At 3.89%, a rental that roughly covered its own costs had some cushion. At 5.08%, the same rental may be carrying more of its own interest than the numbers suggested a few years ago, and a vacancy of even two months weighs more heavily on the result.
A few inputs are worth rebuilding from scratch rather than adjusting:
If the numbers still work with those four inputs, the strategy remains sound. You should learn before signing anything whether the numbers only worked at 3.89%.
One caution on the tax side: deductibility follows how the borrowed money is used, so the paper trail matters as much as the rate. How the funds move between accounts, and what they are spent on, should be documented clearly enough that an accountant can follow it.
The old article was right about the method
The method in the earlier piece still stands. Only the input has aged, and a single stale number runs through every figure built on top of it. Rerunning the calculation at today's rates takes an afternoon with a lender's quote and your last tax return, and it is the kind of work where a mortgage professional and an accountant looking at the same file catch what each would miss alone. If you'd like to see your own numbers laid out at the current range, I'm glad to walk through them with you.
Sources
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