The Smith Manoeuvre is a Canadian tax strategy that converts the non-deductible interest on your home mortgage into tax-deductible investment interest. It lets you build an investment portfolio while you pay down your home, using the equity you create with every mortgage payment.
The strategy was popularised by Fraser Smith and relies on a specific mortgage structure. Done correctly, it can turn years of dead mortgage interest into a deductible expense that works in your favour at tax time.
Pekoe Mortgages is a licensed brokerage (FSRA Licence #13321 in Ontario, RECA licensed in Alberta), and we set up the readvanceable mortgages that make this strategy possible.
What is the Smith Manoeuvre?
The Smith Manoeuvre is a debt conversion strategy that makes your mortgage interest tax-deductible by borrowing to invest. In Canada, interest on money borrowed to buy your home is not deductible, but interest on money borrowed to earn investment income is.
The strategy exploits that gap legally. As you pay down your mortgage principal, you re-borrow that same amount through a linked line of credit and invest it in income-producing assets.
The result is a mortgage that shrinks on the deductible side while your investment portfolio grows. Your total debt stays roughly the same, but the nature of that debt changes from non-deductible to deductible.
How does the Smith Manoeuvre work?
The Smith Manoeuvre requires a readvanceable mortgage, which combines a regular mortgage with a home equity line of credit (HELOC) that grows automatically as you pay down principal. This single product is the engine of the whole strategy.
Here is the cycle in plain terms. You make your normal mortgage payment, and the principal portion frees up an equal amount of room on the HELOC.
You then borrow that freed-up room and invest it in eligible income-producing investments. The interest on the HELOC becomes tax-deductible because the borrowed money is used to earn income.
At tax time, you claim that interest as a deduction, and many people reinvest the refund back into the mortgage to speed the whole process up. This loop repeats every month until the original mortgage is fully converted.
A simple illustration of the mechanics
| Step | Action | Effect |
|---|---|---|
| 1 | Make regular mortgage payment | Principal drops, HELOC room opens by the same amount |
| 2 | Borrow the freed HELOC room | Cash available to invest |
| 3 | Invest in income-producing assets | HELOC interest becomes tax-deductible |
| 4 | Deduct the interest, reinvest the refund | Mortgage converts faster, portfolio grows |
Smith Manoeuvre versus cash damming: what is the difference?
The Smith Manoeuvre is built for salaried homeowners who want to invest, while cash damming is built for self-employed people and business owners who want to convert business or rental expenses. Both make interest deductible, but they serve different people and use different cash flows.
With the Smith Manoeuvre, you borrow to buy investments such as index funds, dividend stocks, or other income-producing assets. With cash damming, you route your everyday business or rental expenses through a line of credit so the interest tied to earning that income becomes deductible.
The two strategies can even work together for a business owner who also wants an investment portfolio. If you want the mechanics of the business-expense version, read our full guide on the cash damming strategy in Canada.
| Feature | Smith Manoeuvre | Cash Damming |
|---|---|---|
| Best suited to | Salaried homeowners who invest | Self-employed, business, rental owners |
| Borrowed money used for | Income-producing investments | Business or rental expenses |
| Mortgage type needed | Readvanceable mortgage | Line of credit plus tracked accounts |
| Main risk | Investment market risk | Cash flow and record-keeping |
What are the risks of the Smith Manoeuvre?
The main risk is that you are borrowing to invest, which magnifies both gains and losses. If your investments fall in value, you still owe the full HELOC balance, and the interest cost continues regardless of how markets perform.
Interest rates are the second risk. A HELOC carries a variable rate, so a rising rate environment increases your carrying cost and can shrink the net benefit of the deduction.
Discipline is the third risk, and it is often the one people underestimate. The strategy only works if you invest the borrowed money every month and never spend it on lifestyle, because personal spending breaks the CRA link between the loan and the income.
Record-keeping matters just as much. To defend the deduction, you must keep a clean paper trail that traces every dollar of borrowed money to an income-producing investment.
Who is the Smith Manoeuvre right for?
The Smith Manoeuvre suits homeowners with stable income, a long investment horizon, meaningful home equity, and a genuine tolerance for market risk. It is a long-term strategy, not a quick win, and it rewards patience over many years.
It is a poor fit for anyone close to retirement, anyone with unstable income, or anyone who would lose sleep watching a debt-funded portfolio drop. Borrowing to invest is not for the faint of heart.
Because the strategy touches your mortgage, your investments, and your taxes at the same time, it should be built with a mortgage broker, a financial advisor, and a tax professional working together. We describe the options here, but you should always confirm your own situation with qualified advisors.
What are the tax implications?
Under CRA rules, interest is deductible when the borrowed money is used to earn business or investment income, and the Smith Manoeuvre is designed around that principle. The HELOC interest is claimed as a carrying charge on your tax return.
The deduction is only as strong as your documentation. If the CRA reviews your return, you need to show that every borrowed dollar went into an eligible income-producing investment.
Tax rules change and personal situations differ, so treat this as general information rather than tax advice. A CRA-savvy accountant should confirm the structure before you begin. Have a question about whether your mortgage can support this strategy? Chat with our team or AI assistant directly on pekoe.ca.
Frequently Asked Questions
Is the Smith Manoeuvre legal in Canada?
Yes. The Smith Manoeuvre is legal because it follows the CRA rule that interest on money borrowed to earn investment income is tax-deductible. The key is that the borrowed money must actually be invested in income-producing assets and tracked carefully.
Do I need a special mortgage for the Smith Manoeuvre?
Yes. You need a readvanceable mortgage, which links a standard mortgage to a home equity line of credit that grows as you pay down principal. Without that structure, you cannot re-borrow your paid principal to invest.
How is the Smith Manoeuvre different from cash damming?
The Smith Manoeuvre borrows to buy investments and suits salaried homeowners, while cash damming routes business or rental expenses through a line of credit and suits the self-employed. Both convert non-deductible interest into deductible interest, but they use different cash flows.
Can I lose money with the Smith Manoeuvre?
Yes. Because you are borrowing to invest, a market downturn can leave you owing the full loan while your investments are worth less. The strategy amplifies both gains and losses, so it requires a long horizon and real risk tolerance.
Who should I talk to before starting the Smith Manoeuvre?
Speak with a licensed mortgage broker, a financial advisor, and a tax professional before you begin. Together they can confirm the mortgage structure, the investment plan, and the CRA compliance that make the strategy work.
Set Up the Right Mortgage Structure
The Smith Manoeuvre lives or dies on the mortgage behind it. A properly built readvanceable mortgage is the difference between a clean, deductible strategy and a paperwork mess.
Talk to a licensed Pekoe broker about a readvanceable mortgage built for the Smith Manoeuvre.
