Smith Manoeuvre Calculator
Model Your Tax Savings in 60 Seconds
The Smith Manoeuvre is a CRA-compliant strategy that converts your non-deductible mortgage interest into tax-deductible investment debt.
This allows you to build wealth using equity you're already creating, without changing your monthly budget.
Instead of simply paying down your mortgage, you re-borrow the equity you've built and invest it in income-generating assets. The interest on that investment loan becomes tax-deductible — reducing your taxable income each year.
Tax refunds: Each year, your CRA refund (based on your marginal tax rate × HELOC interest paid) is automatically applied as a lump-sum mortgage prepayment, re-borrowed from the HELOC, and invested — accelerating how fast you convert non-deductible debt into deductible debt and building your portfolio faster.
- Strategy Start Month
- The month you begin executing the Smith Manoeuvre. This matters because CRA tax refunds are typically issued mid-year (around June, following an April 30 filing deadline), and the calculator times your refund reinvestment accordingly.
- Marginal Tax Rate
- Your tax rate on the last dollar you earn — not your average tax rate. This determines how much of your HELOC interest comes back to you as a refund each year. In Ontario, higher-income earners commonly fall between 43% and 53% depending on total income.
- Investment Return
- The annual return you expect on the investments purchased with your re-borrowed HELOC funds. This should reflect a long-term, diversified portfolio assumption — CRA requires borrowed funds be used with a genuine expectation of earning investment income.
- Property Value
- The current market value of your home, used to calculate your available HELOC room under OSFI's loan-to-value limits.
- Mortgage Balance
- Your current outstanding mortgage balance — the starting point for how much principal will be converted into deductible debt over time.
- Rate
- Your current mortgage interest rate, used to calculate your monthly payment and amortization schedule.
- Amort (yrs)
- Your remaining amortization period in years — how long it would take to pay off the mortgage at your current payment.
- HELOC Rate
- The interest rate on your Home Equity Line of Credit. This is typically higher than your mortgage rate, but becomes tax-deductible when the funds are used for investment purposes under this strategy.
- HELOC Global Limit
- The maximum amount your HELOC can grow to over time. Most lenders cap a standalone HELOC at 65% loan-to-value, with mortgage + HELOC combined capped at 80% loan-to-value under OSFI guidelines.
What is the Smith Manoeuvre?
The Smith Manoeuvre is a CRA-compliant mortgage strategy that converts non-deductible mortgage interest into tax-deductible investment loan interest. As you pay down your mortgage principal, you re-borrow that same amount through a HELOC and invest it in income-producing assets. The interest on the HELOC portion becomes tax-deductible because it was borrowed for the purpose of earning investment income.
Is the Smith Manoeuvre legal and CRA-compliant?
Yes — when executed correctly. The strategy relies on a long-standing CRA principle that interest is deductible when borrowed money is used to earn investment income. The risk isn't the strategy itself; it's improper execution, such as commingling personal and investment funds, which can jeopardize the deductibility of the interest. Working with an SM-certified mortgage professional and a knowledgeable accountant significantly reduces this risk.
Who is a good fit for the Smith Manoeuvre?
Generally, homeowners with stable, higher incomes, meaningful home equity, a long-term investment horizon, and comfort with market risk. It isn't designed for short-term gains, and it isn't a fit for those who can't tolerate the ups and downs of an investment portfolio.
Do I need a re-advanceable mortgage?
In most cases, yes. A re-advanceable mortgage automatically makes your paid-down principal available again as HELOC room, without needing to refinance. If you don't currently have one, you generally need to be at 80% loan-to-value or better to set one up. In some cases, a HELOC on a rental property with sufficient equity can be used instead.
What are the main risks?
The two biggest risks are market risk — your investments could lose value, particularly in the short term — and execution risk, where improperly tracing or commingling funds can disqualify the interest deduction with CRA. There's also interest rate risk, since HELOC rates are variable and tied to the prime rate.
How is this different from just paying down my mortgage faster?
A standard accelerated paydown reduces your mortgage faster but builds no investment portfolio and creates no tax deduction. The Smith Manoeuvre uses the same equity you're already building to simultaneously create tax-deductible debt and grow an investment portfolio — without changing your monthly cash flow.
How accurate are the numbers in this calculator?
This calculator provides a long-term projection based on the assumptions you enter — your mortgage rate, HELOC rate, investment return, and tax rate. Actual results will vary based on real market performance, future rate changes, and your specific financial situation. It's meant to illustrate the mechanics and potential of the strategy, not to predict precise future outcomes.