Smith Manoeuvre: Make Mortgage Interest Deductible
Canada does not let you deduct the interest on the home you live in. The Smith Manoeuvre does not change that rule — it works around it, by slowly converting non-deductible mortgage debt into deductible investment debt. Here is how it works, what it is worth in numbers, and where it can go wrong.
How we check the numbers: every figure on this page is calculated from official CRA, Statistics Canada or Bank of Canada data and cross-checked with the free calculators on this site — run them yourself to verify.
The short version
The idea comes from Fraser Smith, a Canadian financial planner. It is not a mortgage product and it is not a loophole the CRA has struck down. It rests on one long-standing rule: interest on money borrowed to earn income is deductible. Money borrowed to buy the home you live in earns no income, so that interest is not.
How the Smith Manoeuvre works, step by step
- Get a readvanceable mortgage. This pairs a regular amortizing mortgage with a HELOC under one plan, usually registered as a collateral charge.
- Pay your mortgage as normal. Each payment reduces principal. Say you pay down $10,000 of principal — $10,000 of HELOC room frees up.
- Re-borrow that $10,000 from the HELOC. Do not spend it. Invest it in a separate, non-registered account.
- Invest only for income. Dividend-paying stocks, interest-bearing products, or funds that pay distributions qualify. The investment must be capable of producing income — dividends or interest, not capital gains alone.
- Claim the HELOC interest on line 22100. That is the CRA's carrying charges and interest expenses line. The mortgage interest itself stays non-deductible.
- Use the tax refund to pay down the mortgage faster. That frees up more HELOC room, and the cycle repeats. Over many years, the mortgage shrinks while the deductible investment loan grows.
Keep the money trail clean. Borrowed funds must be traceable to the investment. Mixing personal spending into the same HELOC muddies the deduction — only the investment portion stays deductible.
The two caps that limit how much you can borrow
OSFI's Guideline B-20 sets two ceilings for federally regulated lenders:
- 65%: the revolving HELOC portion cannot exceed 65% of the home's value.
- 80%: total mortgage-plus-HELOC borrowing cannot exceed 80% of the home's value. Anything above 65% must be amortizing and non-readvanceable — principal paid on that slice shrinks the total limit instead of freeing up new room.
The math is $800,000 × 80% = $640,000, minus the $450,000 mortgage = $190,000 of HELOC room. The 65% revolving cap alone would allow $520,000, so in this example the 80% combined cap is the binding one. Your lender also applies a stress test and debt-service ratios, so equity alone does not guarantee the full amount.
What the tax saving is actually worth
A worked example, using prime at 4.70% as of November 1, 2026 as the illustration rate. Your actual HELOC rate is usually prime plus a margin, so check your contract — a higher rate means more interest, and a bigger deduction, but also a bigger bill.
The math: $100,000 × 4.70% = $4,700 of interest. At an illustrative 40% marginal tax rate, the deduction saves $4,700 × 40% = $1,880, leaving a net cost of $2,820. That 40% is an illustration, not your rate — your actual saving depends on your marginal bracket, and the deduction reduces taxable income, it does not refund the interest dollar for dollar. The investment itself still has to perform: dividends and growth are what make the strategy pay, not the deduction alone.
Three things never qualify: interest on money borrowed to contribute to an RRSP, TFSA or other registered plan; interest where the only possible return is a capital gain; and interest on money spent on personal items. The CRA's line 22100 guidance states all three exclusions plainly.
Who it suits — and who should skip it
It tends to suit: homeowners with at least 20–25% equity, stable income, a fully funded emergency fund, registered accounts already handled, and a horizon of 15 years or more. You need to be comfortable carrying debt through a market drop.
Skip it if: your income is unstable, you plan to sell within five years, you carry high-interest consumer debt, or owing money keeps you up at night. Selling the home repays both the mortgage and the HELOC from the proceeds, and the ongoing deduction ends with the loan.
The risks, stated plainly: investments can fall while the debt stays fixed — a 20% drop leaves you owing the full HELOC balance. HELOC rates are variable, so a rate rise lifts your cost with no warning. And the setup is fiddly: separate accounts, monthly re-borrowing, and records the CRA can ask about years later. A mortgage broker who knows readvanceable products, plus an accountant who understands interest deductibility, are worth paying for before you start.
Frequently asked questions
Is mortgage interest tax deductible in Canada?
No, not on the home you live in. Interest is deductible only when the borrowed money is used to earn income, such as dividends, interest or rent. The Smith Manoeuvre uses that rule: borrowed home equity is invested for income, so the interest on that borrowing can be claimed.
What is a readvanceable mortgage?
It is a mortgage combined with a HELOC under one plan. As you pay down mortgage principal, the same amount becomes available on the HELOC. That re-borrowed amount is then invested in income-producing assets, and the cycle repeats.
How much can I borrow with a HELOC in Canada?
For federally regulated lenders, the revolving HELOC portion is capped at 65% of the home's value, and total mortgage-plus-HELOC borrowing is capped at 80%. On an $800,000 home with a $450,000 mortgage, the combined cap allows $190,000 of HELOC room.
Where do I claim the deductible interest?
On line 22100, carrying charges and interest expenses. The CRA allows most interest on money borrowed to earn investment income, including interest and dividends, but not interest on money borrowed to contribute to an RRSP, TFSA or other registered plan, and not interest where the only possible return is a capital gain.
What is the biggest risk of the Smith Manoeuvre?
You are borrowing against your home to invest, so losses do not erase the debt. If investments fall 20% while your HELOC balance stays the same, you still owe every dollar, plus interest at a variable rate. It suits disciplined borrowers with stable income and a long horizon, not everyone.
Sources
- Canada Revenue Agency — Line 22100, carrying charges and interest expenses (official)
- OSFI — Clarification on innovative real estate secured lending products under Guideline B-20 (65% / 80% caps, official)
- Wealthsimple — Smith Manoeuvre: how to make your mortgage interest tax-deductible in Canada
- LoansCanada — Mortgage interest tax deduction Canada: rules and loopholes
Paying down the mortgage instead?
We ran the numbers: $500 extra a month on a $500k mortgage vs investing it — and what the October 28 BoC hike to 2.50% means for variable mortgages.
Educational content only — not financial advice. Figures are estimates; confirm your own situation with the CRA or a licensed financial advisor. See our Disclaimer.