Free Canadian tax-strategy tool
Smith Manoeuvre Calculator
Convert non-deductible mortgage interest into deductible investment-loan interest using a HELOC.
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In Canada, interest on your mortgage isn't tax-deductible. Interest on a loan used to invest is. The Smith Manoeuvre uses that asymmetry: as you pay down your mortgage, you re-borrow the freed HELOC credit and invest it. Over 25 years, the entire mortgage is gradually converted into a tax-deductible investment loan — and you build an investment portfolio on top.
This calculator quantifies the upside (HELOC growth, investment compounding, annual tax savings, cumulative net benefit) and flags the risks (rate spread, volatility, time horizon) so you can decide if the strategy fits.
How the Smith Manoeuvre actually works
- You hold a readvanceable mortgage — a mortgage tied to a HELOC where the HELOC limit grows as you pay down principal.
- Each month you pay your normal mortgage payment, reducing principal by some amount.
- The freed HELOC credit (equal to the principal paid) becomes available — you immediately borrow it back.
- You invest that borrowed amount in income-producing investments (dividend stocks, ETFs, etc.).
- The HELOC interest is now tax-deductible because the loan was used for income-earning purposes (CRA section 20(1)(c)).
- You receive a tax refund every year on the HELOC interest paid.
- Over 25 years the mortgage is fully paid off — and the HELOC, now equal to the original mortgage, is fully tax-deductible. You also have a built-up investment portfolio.
Important risks
- Leverage cuts both ways. If your investments return less than the HELOC rate (after tax savings), you lose money.
- Rate risk. HELOC rates float. A rising-rate environment compresses or eliminates the spread between borrowing cost and returns.
- Volatility risk. The strategy is most resilient with broad-market, lower-volatility investments held for the long term.
- Documentation is critical. CRA expects clean tracing of borrowed funds to investments. Co-mingling borrowed and personal money breaks the deduction.
Frequently asked questions
Is the Smith Manoeuvre legal?
Yes, under CRA rules — based on the income-earning purpose test in section 20(1)(c) of the Income Tax Act. Investments must have potential to earn income (interest, dividends, rent). Documentation matters. Consult a tax professional before implementing.
Do I need a special mortgage?
Yes — a readvanceable mortgage (HELOC-mortgage / all-in-one). As principal is paid, the HELOC credit limit grows by the same amount. Manulife One, Scotia STEP, National Bank All-in-One, and similar products from the big banks all qualify.
What's the minimum equity needed?
In Canada, HELOCs are capped at 80% loan-to-value. So you need (home value × 80%) − current mortgage balance > 0 to start. The more equity, the larger the available HELOC.
Disclaimer: This calculator is for informational purposes only and is not financial, tax, or legal advice. The Smith Manoeuvre involves leverage and meaningful risk of loss. Always consult a licensed financial planner and a tax professional before implementing any leveraged investment strategy.