The Smith Manoeuvre: Making Mortgage Interest Tax-Deductible in Canada
In Canada, interest on your home mortgage isn't tax-deductible. Interest on money borrowed to invest can be. The Smith Manoeuvre — also spelled Smith Maneuver — is a strategy that gradually converts one into the other using a readvanceable mortgage. It can work, but it adds risk to your largest debt. Here's how it works, what the tax rules require, and what to check before you start.
Key takeaways
- You re-borrow each dollar of mortgage principal you repay from a HELOC and invest it in income-producing investments.
- Interest on the HELOC portion may be deductible because the money was borrowed to earn income from property.
- Your total debt doesn't fall — you're replacing non-deductible debt with deductible debt and building an investment portfolio alongside it.
- It suits disciplined borrowers with stable income and a long horizon. Get tax and investment advice before you start.
How the Smith Manoeuvre works
The strategy needs a readvanceable mortgage: a regular amortizing mortgage combined with a home equity line of credit, where the HELOC limit rises as the mortgage falls. See HELOC explained for how those work.
- Make your regular mortgage payment. Part of it repays principal.
- Borrow that principal back from the HELOC. Your HELOC room grew by exactly that amount.
- Invest it in a non-registered account, in investments that can reasonably be expected to produce income — for example, dividend-paying shares or funds.
- Deduct the HELOC interest on your tax return, and ideally put the tax refund against the mortgage, which frees up more HELOC room to invest.
Over time, the non-deductible mortgage shrinks and the deductible HELOC grows by the same amount. The total you owe stays roughly the same until the mortgage is gone.
The tax rule behind it
Under paragraph 20(1)(c) of the Income Tax Act, interest is generally deductible when borrowed money is used for the purpose of earning income from a business or property. The Canada Revenue Agency explains how it applies in Income Tax Folio S3-F6-C1, Interest Deductibility. Three points matter most for the Smith Manoeuvre:
- It's the use of the money that counts, not what secures the loan. Borrowing against your home is fine if the money goes into eligible investments.
- You must be able to trace it. Keep the borrowed money separate from personal money. Drawing from the HELOC straight into an investment account makes the trail clear; mixing it with your chequing account doesn't.
- The purpose must be income. Investments with a reasonable expectation of income, such as interest or dividends, generally qualify. Investments that can't reasonably be expected to produce income, and money held in an RRSP or TFSA, don't.
If you later sell an investment and spend the proceeds, the matching portion of the HELOC generally stops being deductible. Any withdrawal for personal use can taint the deduction.
An illustration
Suppose that after several years you've re-borrowed $100,000 from the HELOC and invested it, and the HELOC rate is 6.00%. That's $6,000 of interest a year. If your marginal tax rate is 40%, deducting it could reduce your taxes by about $2,400 — which you'd then put against the mortgage.
Whether you come out ahead depends on what your investments earn after tax, compared with the after-tax cost of the interest. If investments fall while you're carrying the HELOC, you can lose money and still owe the full balance.
The risks
- Leverage cuts both ways. You're investing borrowed money. A market decline can leave you with a portfolio worth less than the debt against your home.
- Rising rates. HELOCs are variable. Higher prime means higher interest, which may outpace investment returns.
- The debt doesn't go away. Unlike a regular mortgage, your total borrowing doesn't fall over time unless you use investments or other money to repay it.
- The lender can change the limit. A HELOC is a demand loan.
- Tax risk. Poor record-keeping, mixed funds or investments that don't qualify can make the interest non-deductible after the fact.
- Behaviour. Easy access to a growing line of credit is a temptation. The strategy fails if the HELOC is also used for spending.
Who it can suit
| Can suit you if… | Probably not for you if… |
|---|---|
| Your income is stable and your emergency savings are separate | Your income is irregular or your budget is tight |
| You have a 10-year-plus horizon and tolerate market drops | You'd need to sell investments in a downturn |
| You're in a higher tax bracket | You have little taxable income to deduct against |
| You'll keep meticulous records | You'd struggle to keep borrowed money separate |
| You've already used your RRSP and TFSA room | You have unused registered room or high-interest debt |
Setting it up
- Choose the right mortgage. You need a readvanceable product whose HELOC room increases automatically as you pay down the mortgage, ideally with sub-accounts so you can keep investment borrowing separate.
- Check the limits. Mortgage plus HELOC can't exceed 80% of your home's value with a federally regulated lender. See our HELOC page.
- Consider timing. It's usually easiest to set up at purchase, renewal, or through a refinance, so you don't pay a penalty to switch.
- Get advice. Talk to a tax professional about deductibility and to a licensed investment adviser about what to invest in. A mortgage broker can arrange the mortgage, but not the tax or investment advice.
Sources
This article is general information, not tax, legal, investment or financial advice. Tax treatment depends on your circumstances; consult a qualified tax professional before using borrowed money to invest. Lendmax arranges mortgage financing and does not provide tax or investment advice. Credit is subject to lender approval.
Frequently asked questions
Yes. It uses ordinary interest-deductibility rules in the Income Tax Act. The deduction depends on how you use and track the borrowed money, so records matter.
Both. Fraser Smith, who popularized the strategy, used the Canadian spelling "manoeuvre"; many people search for "Smith maneuver".
You need a readvanceable mortgage — a mortgage combined with a HELOC whose limit rises as you pay the mortgage down. Not every lender offers one.
Interest on money borrowed to contribute to an RRSP or TFSA isn't deductible, so the Smith Manoeuvre uses a non-registered account.
You still owe the full HELOC balance. You can hold through a downturn if your cash flow allows, but you carry the risk.
Need a readvanceable mortgage?
We'll compare readvanceable products — sub-accounts, HELOC limits and rates — across several lenders. Bring your tax adviser's plan; we'll arrange the financing.