Is the Smith Maneuver Worth It in Canada?

The Smith Maneuver converts mortgage debt into investment debt. Interest on the mortgage for your own home is not tax-deductible. Interest on money borrowed to invest in a non-registered account generally is. Each time a payment reduces your mortgage principal, you borrow the same amount back on a home equity line of credit (HELOC) and invest it. Your total debt stays the same, but each year more of it is a deductible investment loan, and you build a portfolio alongside it.

Online videos often say the strategy "pays you" $300,000. A worked example shows what that kind of figure leaves out. Take a $425,000 home bought with 20% down: a $340,000 mortgage at 4.5% over 25 years, a HELOC at 5.5%, investments yielding 3.4% in dividends plus 3.5% a year in price growth, and an Ontario income of $100,000, which has a 31.48% marginal tax rate. Over 25 years you re-borrow the full $340,000 and pay about $190,500 in HELOC interest. Deducting that interest brings back about $60,000 in tax refunds, so the strategy costs about $130,500 of your own cash.

When the mortgage is paid off, the portfolio is worth about $684,700, after about $48,900 of tax on dividends paid along the way. Selling it to repay the HELOC triggers about $31,200 of capital gains tax, because half of a capital gain is taxable. After repaying the $340,000 loan you keep about $313,500. Headlines that add up refunds and dividends without subtracting tax or the loan overstate the result.

The fair comparison is what the same cash would do without borrowing. Putting that $130,500 into a TFSA as you go, at the same return, would grow to about $235,300 tax-free, with no loan against your home. In this example the Smith Maneuver comes out about $78,000 ahead over 25 years. That edge depends on the numbers: it falls to about $14,000 if the HELOC rate is 7%, and becomes a loss of about $31,000 if prices grow 1% a year instead of 3.5%. The example assumes steady returns, fixed rates, the same tax rate every year and that every dollar of principal can be re-borrowed. Real markets and lending rules do not work that way.

The tax deduction has conditions. Interest is claimed as a carrying charge (line 22100) when the borrowed money is used to earn income from a business or property. The CRA generally accepts common shares bought with a reasonable expectation of dividends, but not an expectation of capital gains alone. You must be able to trace the borrowed money to the investments, so keep the investment HELOC separate and never use it for personal spending. Interest on money borrowed for an RRSP or TFSA contribution is not deductible. In Quebec, investment expenses reduce provincial tax only up to the year’s investment income; the rest is carried over.

You also need a lender that allows it. At federally regulated lenders, the revolving part of a HELOC can reach at most 65% of the home’s value, and the HELOC plus the mortgage at most 80%. Borrowing above the 65% line must be amortizing and cannot be re-borrowed: principal you repay there lowers your limit instead. With 20% down on a $425,000 home, roughly the first $63,750 of principal cannot be re-borrowed unless the home rises in value, and the HELOC tops out at $276,250. A re-advanceable mortgage, which raises your HELOC limit as you pay the mortgage down below that line, is what makes the strategy practical.

The main risk is leverage. You owe the full loan whatever the portfolio is worth, and the balance is largest near the end, when a market fall would hurt most. HELOC rates are usually variable: each percentage point on a $340,000 balance adds $3,400 a year in interest. Read your credit agreement for when the lender can lower the limit or ask for repayment. The strategy only works if you can pay the interest from your budget every month and keep investing through downturns.