Is the Smith Manoeuvre a way to pay off my mortgage faster?

Partly, and this is where marketing gets slippery. The refunds and any investment income directed at the mortgage do retire the non-deductible mortgage sooner. But your total debt does not fall: it is replaced dollar for dollar by an investment loan. You end the manoeuvre mortgage-free and loan-carrying, not debt-free.

Can I invest the borrowed money in my TFSA or RRSP instead?

No, not if you want the deduction. Interest on money borrowed to contribute to registered accounts is not deductible. The strategy only works in a non-registered account, which also means the portfolio's dividends are taxable each year, a cost to include in any honest projection.

What happens if I sell my house?

The mortgage and HELOC are both secured by the property, so both must be discharged at closing. You can pay off the investment loan from the sale proceeds, or in some cases re-establish the borrowing against a new property, but the tracing rules follow the money, so this transition needs professional guidance to keep deductions intact.

Smith Manoeuvre

Manoeuvre Smith in French

Quick definition

The Smith Manoeuvre is a strategy that gradually converts non-deductible mortgage interest into tax-deductible investment-loan interest. Using a readvanceable mortgage, each principal payment frees credit room that you re-borrow and invest in income-producing assets, claiming the interest as a deduction.

The core idea

In Canada, the interest on the mortgage for your own home is not tax-deductible. Interest on money borrowed to earn investment income generally is. The Smith Manoeuvre exploits that asymmetry: over the life of a mortgage, it swaps ordinary mortgage debt for an investment loan of the same size, so the interest you were paying anyway starts generating tax deductions, while the borrowed money builds an investment portfolio.

The engine is a readvanceable mortgage: a mortgage paired with a HELOC under one credit limit, where the HELOC portion grows automatically as mortgage principal is paid down. Every dollar of principal you repay converts into a dollar of available credit backed by your home equity.

How it works, step by step

A full cycle of the manoeuvre looks like this:

You make your regular mortgage payment. The principal portion frees the same amount of room on the HELOC side.
You borrow that freed room from the HELOC and invest it in income-producing assets, such as dividend-paying stocks or funds, in a non-registered account.
Because the borrowed money was used to earn investment income, the HELOC interest is tax-deductible against your income at your marginal tax rate.
At tax time, the deduction produces a refund. You apply the refund as a mortgage prepayment, which frees even more HELOC room, which you borrow and invest, accelerating the cycle.
Repeat every payment period. Over the years, the non-deductible mortgage shrinks toward zero while the deductible investment loan grows toward the original mortgage size.

The deductibility rules: where the strategy lives or dies

The entire premise depends on the interest actually being deductible, and the rules are strict. Interest is deductible only when the borrowed money is used to earn income from property, meaning dividends or interest. The CRA's current position requires a reasonable expectation of earning such income; investments that can only ever produce capital gains do not qualify.

Just as important, the borrowed funds must be traceable from the HELOC to the investment. Keep the HELOC exclusively for investing: a single withdrawal for personal spending mixes the funds and contaminates the tracing for the whole line, forcing messy proration and putting deductions at risk. Serious practitioners use a dedicated HELOC or sub-account that never touches personal cash flow, and keep every statement.

Selling investments also matters. If you sell and spend the proceeds rather than repaying the loan or reinvesting, the interest on the corresponding borrowing generally stops being deductible.

The risks: this is leveraged investing with your house

Strip away the tax mechanics and the Smith Manoeuvre is one thing: borrowing against your home to invest in markets, continuously, for decades. The tax refund is real, but so is everything else.

The debt is real and permanent by design. A fully implemented manoeuvre ends with an investment loan roughly the size of your original mortgage, secured by your house. The plan assumes you are comfortable carrying that loan indefinitely.
Markets can fall while the loan does not. A 30% portfolio decline leaves you with the full debt and a much smaller portfolio. Leverage magnifies losses exactly as efficiently as gains.
Rising rates raise the carrying cost. HELOC rates float with prime. A rate cycle that adds two points to prime adds thousands per year in interest on a large balance, deductible or not.
Behaviour risk. The strategy only works if you keep investing through downturns and never raid the HELOC for personal spending. Two decades is a long time to be disciplined.

Who it might suit, and what it requires

Structurally, you typically need at least 20% equity in your home, since readvanceable mortgages are uninsured products capped at 80% of the property's value, and you need to qualify for the combined limit.

Financially and temperamentally, the manoeuvre suits a narrow profile: high and secure income, a long horizon, real tolerance for volatility, meticulous record-keeping, and no need to touch the invested money. The higher your marginal tax rate, the more each dollar of interest returns as a refund. If a market crash paired with a job loss would force you to sell investments to service the loan, this strategy is not for you. Professional tax and investment advice before starting is strongly advised, not a formality.

This is not a free lunch. It is a leverage strategy with a tax subsidy attached, and its long-run result depends on investment returns exceeding the after-tax cost of borrowing. Nothing guarantees that ordering.

A note for Québec residents

Québec applies its own limit on investment expenses. On the provincial TP-1 return, the deduction for investment expenses, including interest, is generally limited to the investment income earned in the year, with unused amounts carried to other years. Since much of the manoeuvre's appeal is the annual refund, Québec residents should model the provincial side carefully before assuming the full deduction arrives each year.

In Canada

The Smith Manoeuvre is a distinctly Canadian strategy, developed and popularized by Fraser Smith, a British Columbia financial planner, in his 2002 book of the same name. It exists precisely because Canada, unlike the United States, does not allow homeowners to deduct mortgage interest on a principal residence: the manoeuvre is an elaborate workaround that manufactures the deduction Americans get automatically. Its popularity tends to rise in bull markets and fade after downturns, which says something worth hearing.

Worked example

Sophie has a $400,000 readvanceable mortgage and a 45% marginal tax rate. In her first year, her payments repay about $12,000 of principal, freeing $12,000 of HELOC room, which she borrows and invests in a diversified dividend portfolio in a non-registered account (as of July 2026, illustrative figures).

At a 6% HELOC rate, that first year's draws cost a few hundred dollars of interest, deductible at 45%. Years later, with $150,000 borrowed and invested, the annual interest is about $9,000, generating roughly $4,050 in tax savings that she applies against the mortgage. Her net carrying cost is about $4,950 per year, and the strategy is profitable only if the portfolio's long-run return beats that after-tax cost.

The mirror scenario matters just as much: if her $150,000 portfolio drops 30% in a bad year, she still owes the full $150,000, now backed by $105,000 of investments, and the interest bill arrives every month regardless.