When Is Investment Loan Interest Tax-Deductible in Canada? Rules, Risks, and What to Know

The Basic CRA Rule: When Investment Interest Is Deductible

According to the CRA, interest paid on money borrowed for the purpose of earning investment income — such as interest or dividends — is generally deductible on line 22100 of your tax return. This is governed by paragraph 20(1)(c) of the Income Tax Act.

Three conditions must be met:

• The borrowed money is used to acquire eligible investments (shares, bonds, mutual funds in a non-registered account).
• There is a reasonable expectation of income — dividends, interest, or other income (not just capital gains).
• You can clearly trace the use of the borrowed funds to those investments.

If you mix borrowed funds with personal money or use them partly for personal purposes, the deductibility may be reduced proportionally. Traceability is essential.

What Is NOT Deductible: TFSAs, RRSPs, and Pure Capital Gains

Watch out for these common traps:

Why are registered accounts (TFSA/RRSP) excluded? Because income inside them is sheltered from tax — there is no taxable income to generate, so the CRA denies the deduction. To understand how investment income is taxed more broadly, read our article on how investment income is taxed in Canada.

The Smith Manoeuvre: Concept and Limitations

You may have heard of the Smith Manoeuvre. The core idea: use your home equity (via a home equity line of credit, or HELOC) to invest in a non-registered account, thereby making the interest potentially deductible — converting non-deductible mortgage debt into potentially deductible investment debt over time.

It is not illegal, but it is a complex, long-term, high-risk strategy that requires:

• A readvanceable mortgage (HELOC) that lets you re-borrow as you pay down principal.
• Strict discipline to maintain clear traceability of funds.
• Professional tax and financial advice — this strategy is not right for everyone.

The interest deduction does not guarantee a positive return. If your investments decline, you still owe the loan in full.

The Real Risks of Leverage — Read This Carefully

The potential tax deduction can make leveraged investing sound attractive, but it does not change the fundamental nature of leverage risk. Here is what you must understand clearly:

• Losses are amplified. If you borrow $50,000 and your investments drop 30%, you have lost $15,000 — but you still owe $50,000 to the lender, plus interest.
• Margin calls can force sales at the worst time. If you use a margin account, a market drop can trigger a margin call that forces you to sell at a loss to cover your balance.
• Interest rates can rise. Your borrowing cost may increase and outpace your investment returns.
• A tax deduction does not make a bad investment good. If your investments underperform, the interest deduction reduces your tax bill — it does not offset capital losses.

Before borrowing to invest, speak with a qualified tax or financial advisor. Review resources from the CRA and TaxTips.ca to understand the rules that apply to your situation.

How to Properly Document Your Interest Deduction

If you believe you qualify for the deduction, here are best practices:

1. Open a separate bank or brokerage account exclusively for borrowed funds — never commingle with personal money.
2. Keep all records: loan agreement, account statements, trade confirmations.
3. Link every borrowed dollar to a specific eligible investment producing income.
4. Track interest paid each year to claim it on line 22100.
5. Consult an accountant or tax professional, especially if your situation is complex (multiple investments, partial repayments, etc.).

Also watch out for common investing mistakes Canadians make that can cost you at tax time. And if you receive Canadian dividends, learn about the Canadian dividend tax credit, which can improve the tax efficiency of your portfolio.

Frequently asked questions