# The CRA Will Cover Up to Half Your Investment Loan Interest If You Structure It Correctly
The CRA Will Cover Up to Half Your Investment Loan Interest If You Structure It Correctly
An orthodontist in Burlington refinanced her home in 2024 and used $200,000 of equity to buy dividend-paying stocks. The loan cost her 6.2%, or $12,400 annually. At tax time, she deducted the full interest amount. At a 53.53% marginal rate in Ontario, that deduction delivered $6,638 back from the CRA. Her net borrowing cost dropped to 2.8%.
Most Canadians would call that reckless. The orthodontist calls it tax arbitrage.
The Income Tax Act allows a deduction for interest paid on money borrowed to earn income from property or business. Not to buy a car. Not to renovate a kitchen. To earn income. That single rule turns investment debt from a liability into a subsidized tool, but only when the structure is airtight and the purpose is exactly right.
The deduction exists because income is income
The logic is old and mercantile. If you borrow money to generate taxable income, the cost of borrowing is an expense against that income. A self-employed consultant who borrows to buy a laptop deducts the interest. A landlord who borrows to buy rental property does the same. The CRA treats investment income from stocks and bonds no differently. The mechanic is Section 20(1)(c) of the Income Tax Act. The requirement is narrow: the borrowing must be for the purpose of earning income. Not capital gains alone, income. Dividends count. Interest counts. Growth stocks that never pay a dividend do not.
The 2026 version of this strategy rests on a simple piece of arithmetic. If your marginal tax rate is 43.41% at $150,000 income in Ontario and your investment loan costs 6%, the deduction is worth 2.6% in annual tax relief. Your real cost is 3.4%. If the investment yields more than that after tax, you are profitable on borrowed money.
What qualifies and what disqualifies the deduction
The CRA requires a reasonable expectation of income at the time you deploy the funds. Borrow $50,000 and buy shares of a dividend-paying utility, and you have met the test. Gold bars or Bitcoin do not produce dividends or interest. Capital appreciation does not satisfy the requirement. The investment must be capable of producing dividends or interest.
The deduction survives even if the investment loses value. A $100,000 loan used to buy bank stocks that drop to $70,000 still generates a deductible interest expense, as long as those stocks pay dividends. Your purpose at the time of borrowing is what the CRA examines, regardless of what happened to the stock price afterward.
But sell the stock and the deduction typically vanishes. This is the disappearing source rule. If you liquidate the investment and do not immediately redeploy the proceeds into another income-producing asset, the loan is no longer tied to earning income. The interest becomes non-deductible personal debt.
The paper trail determines survival
The CRA will challenge any deduction it cannot trace directly from loan to investment. Co-mingling is the most common error. If you borrow $80,000, deposit it into your chequing account alongside your paycheck and grocery money, then buy stocks three weeks later, the nexus breaks. The burden is on you to prove that specific borrowed dollar bought that specific asset. Open a separate account. Deposit the borrowed funds there. Buy the investment from that account the same day or within 48 hours.
One Alberta engineer borrowed $120,000 against his house in 2025 to buy dividend ETFs. He wired the funds directly from the HELOC into his brokerage account, then executed the trades the next morning. The audit took 15 minutes. The deduction held.
Why registered accounts are excluded
Interest on money borrowed to contribute to an RRSP, TFSA, or FHSA is not deductible under the Income Tax Act because income inside registered accounts is tax-sheltered or tax-free, so there is no taxable income to offset. When you contribute to an RRSP, you claim the contribution itself as a deduction, and the CRA will not allow you to deduct the interest on the borrowed funds as well.
The Smith Manoeuvre™ is the best-known strategy for converting non-deductible mortgage debt into deductible investment debt over time. Each principal payment on your home mortgage increases available equity. Borrow that equity back through a readvanceable line of credit, invest it in dividend-paying assets, and deduct the interest. Done correctly over 20 years, a homeowner can transform an entire mortgage into tax-deductible debt while building an investment portfolio. Done incorrectly, co-mingling funds, missing the paper trail, or investing in non-income-producing assets, the CRA disallows the deduction and the strategy collapses.
The orthodontist's net cost of 2.8% matters because her portfolio yields 4.1% in eligible dividends. After applying the dividend tax credit, her after-tax yield is roughly 3.2%. She is cash-flow positive on borrowed money, and the government is absorbing more than half the interest expense. That is the outcome when the structure is built to the Income Tax Act's exact specifications.
The CRA Will Cover Up to Half Your Investment Loan Interest If You Structure It Correctly
An orthodontist in Burlington refinanced her home in 2024 and used $200,000 of equity to buy dividend-paying stocks. The loan cost her 6.2%, or $12,400 annually. At tax time, she deducted the full interest amount. At a 53.53% marginal rate in Ontario, that deduction delivered $6,638 back from the CRA. Her net borrowing cost dropped to 2.8%.
Most Canadians would call that reckless. The orthodontist calls it tax arbitrage.
The Income Tax Act allows a deduction for interest paid on money borrowed to earn income from property or business. Not to buy a car. Not to renovate a kitchen. To earn income. That single rule turns investment debt from a liability into a subsidized tool, but only when the structure is airtight and the purpose is exactly right.
The deduction exists because income is income
The logic is old and mercantile. If you borrow money to generate taxable income, the cost of borrowing is an expense against that income. A self-employed consultant who borrows to buy a laptop deducts the interest. A landlord who borrows to buy rental property does the same. The CRA treats investment income from stocks and bonds no differently. The mechanic is Section 20(1)(c) of the Income Tax Act. The requirement is narrow: the borrowing must be for the purpose of earning income. Not capital gains alone, income. Dividends count. Interest counts. Growth stocks that never pay a dividend do not.
The 2026 version of this strategy rests on a simple piece of arithmetic. If your marginal tax rate is 43.41% at $150,000 income in Ontario and your investment loan costs 6%, the deduction is worth 2.6% in annual tax relief. Your real cost is 3.4%. If the investment yields more than that after tax, you are profitable on borrowed money.
What qualifies and what disqualifies the deduction
The CRA requires a reasonable expectation of income at the time you deploy the funds. Borrow $50,000 and buy shares of a dividend-paying utility, and you have met the test. Gold bars or Bitcoin do not produce dividends or interest. Capital appreciation does not satisfy the requirement. The investment must be capable of producing dividends or interest.
The deduction survives even if the investment loses value. A $100,000 loan used to buy bank stocks that drop to $70,000 still generates a deductible interest expense, as long as those stocks pay dividends. Your purpose at the time of borrowing is what the CRA examines, regardless of what happened to the stock price afterward.
But sell the stock and the deduction typically vanishes. This is the disappearing source rule. If you liquidate the investment and do not immediately redeploy the proceeds into another income-producing asset, the loan is no longer tied to earning income. The interest becomes non-deductible personal debt.
The paper trail determines survival
The CRA will challenge any deduction it cannot trace directly from loan to investment. Co-mingling is the most common error. If you borrow $80,000, deposit it into your chequing account alongside your paycheck and grocery money, then buy stocks three weeks later, the nexus breaks. The burden is on you to prove that specific borrowed dollar bought that specific asset. Open a separate account. Deposit the borrowed funds there. Buy the investment from that account the same day or within 48 hours.
One Alberta engineer borrowed $120,000 against his house in 2025 to buy dividend ETFs. He wired the funds directly from the HELOC into his brokerage account, then executed the trades the next morning. The audit took 15 minutes. The deduction held.
Why registered accounts are excluded
Interest on money borrowed to contribute to an RRSP, TFSA, or FHSA is not deductible under the Income Tax Act because income inside registered accounts is tax-sheltered or tax-free, so there is no taxable income to offset. When you contribute to an RRSP, you claim the contribution itself as a deduction, and the CRA will not allow you to deduct the interest on the borrowed funds as well.
The Smith Manoeuvre™ is the best-known strategy for converting non-deductible mortgage debt into deductible investment debt over time. Each principal payment on your home mortgage increases available equity. Borrow that equity back through a readvanceable line of credit, invest it in dividend-paying assets, and deduct the interest. Done correctly over 20 years, a homeowner can transform an entire mortgage into tax-deductible debt while building an investment portfolio. Done incorrectly, co-mingling funds, missing the paper trail, or investing in non-income-producing assets, the CRA disallows the deduction and the strategy collapses.
The orthodontist's net cost of 2.8% matters because her portfolio yields 4.1% in eligible dividends. After applying the dividend tax credit, her after-tax yield is roughly 3.2%. She is cash-flow positive on borrowed money, and the government is absorbing more than half the interest expense. That is the outcome when the structure is built to the Income Tax Act's exact specifications.
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