Is Investment Loan Interest Tax-Deductible in Canada?

Often, yes — but it depends on why you borrowed and what you did with the money, not on the type of loan. This is one of the most important ideas behind strategies like borrowing on margin, investing through a HELOC, or the Smith Manoeuvre, because a deductible interest cost is a much cheaper interest cost. Here's the principle in plain terms — it's educational background, not tax advice for your situation.

The core rule

Canadian tax law generally lets you deduct interest on borrowed money when that money is used to earn income from a business or property — for investments, that means income like interest or dividends. The test is about purpose and use: you have to be able to trace the borrowed dollars to an income-earning investment.

The kind of loan doesn't decide it. Interest on a margin loan, a home-equity line of credit, or an ordinary investment loan can all qualify — or not — based entirely on what the borrowed money was actually used for.

What typically qualifies

• Borrowing to buy investments held to produce income — for example, dividend-paying stocks or an income-producing fund in a non-registered account.
• The borrowed money is kept clearly separate and its use is documented, so the tracing is clean.

What typically doesn't

• Borrowing to contribute to an RRSP or TFSA. Interest on money borrowed for registered accounts is generally not deductible — a very common and expensive misunderstanding.
• Borrowing for something purely personal (a car, a vacation), even if it's the same line of credit you also invest through — which is exactly why mixing funds in one account causes problems.
• Situations where there's no genuine expectation of earning income from the investment.

Why it changes the maths of leverage

Deductibility quietly lowers your effective borrowing rate. If you're paying 6% interest on an investment loan and that interest is deductible, then at a marginal tax rate of, say, 40%, roughly 40% of the interest cost comes back to you — so your after-tax cost of borrowing is closer to 3.6% than 6%. The higher your marginal rate, the more the deduction is worth to you.

That's why the same leverage strategy can look very different for two people: their provinces, incomes, and marginal rates change how much the deduction offsets the cost. Our Leverage Strategy Analyser is designed to fold deductibility into the full comparison, using your province and income rather than a single assumed rate.

The catches worth knowing

• Tracing and records matter. If you can't show the borrowed money went to an income-earning investment, the deduction can be denied on review.
• Selling or changing use of the investment can affect deductibility going forward.
• Rules and interpretations change, and the Canada Revenue Agency can reassess. This article describes general principles as of 2026; it is not a ruling on your circumstances.

Before you rely on it

Interest deductibility can make or break the case for borrowing to invest, and the details are genuinely easy to get wrong. Confirm how the rules apply to your specific situation with a qualified tax professional before you count on a deduction — and read Understanding leveraged investing for the risk side of the picture.