The Smith Manoeuvre: Turn Your Mortgage into a Tax Deduction
The Smith Manoeuvre is a legal Canadian strategy that converts non-deductible mortgage interest into tax-deductible investment loan interest — building a portfolio while you pay down your home.
Unlike the U.S., Canada does not allow mortgage interest deductions. But the Smith Manoeuvre creates a workaround: as you pay down principal, you reborrow via a HELOC and invest — making that portion of interest tax-deductible.
Smith Manoeuvre Calculator
How the Smith Manoeuvre Works — Step by Step
Set Up a Readvanceable Mortgage
You need a mortgage with a Home Equity Line of Credit (HELOC) attached — called a 'readvanceable mortgage'. As you pay down principal, that room automatically becomes available in your HELOC. Major Canadian lenders offering this: National Bank's All-In-One, BMO Homeowner ReadiLine, Scotiabank STEP, Manulife One.
Make Your Regular Mortgage Payment
Every month you make your normal mortgage payment. This pays interest and reduces principal. The principal reduction is key — it immediately becomes available as HELOC credit.
Immediately Reborrow the Principal via HELOC
The moment principal is paid, you draw that exact same amount from your HELOC. This keeps your total debt constant, but shifts it from non-deductible mortgage debt to investment HELOC debt.
Invest Every HELOC Draw in a Non-Registered Account
Invest the HELOC draws in a non-registered investment account (NOT a TFSA or RRSP — those investments don't qualify for the deduction). Buy income-generating investments: ETFs, dividend stocks, or REITs.
Deduct the HELOC Interest on Your Tax Return
Because the HELOC funds were used for investment purposes, the interest is tax-deductible under CRA rules (income-earning purpose). You deduct it on line 22100 (carrying charges). At a 40% marginal rate, every $1,000 of HELOC interest saves you $400.
Reinvest Tax Refund to Accelerate the Strategy
Your annual tax refund from the interest deduction can be used to: make a lump-sum mortgage payment (accelerating the strategy), invest further in your non-registered account, or contribute to your RRSP. This 'Smith Manoeuvre Accelerator' compounds the benefit significantly over time.
⚠️ Smith Manoeuvre Risks to Understand
- Investment risk: If markets decline, your portfolio may be worth less than your HELOC balance, leaving you net negative on the strategy.
- Rising interest rates: HELOC rates are variable. A 2% rate increase on a $200,000 HELOC adds $4,000/year in interest costs.
- CRA scrutiny: The strategy must be implemented precisely — investments must be made directly from HELOC draws (not commingled with personal accounts) and must be income-earning investments.
- Lender requirements: Not all lenders offer readvanceable mortgages. Switching lenders to access a qualifying product may have costs.
- Requires discipline: You must never use HELOC funds for personal spending — only for investments. Mixed use destroys the deductibility.