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How to convert your mortgage into a tax-deductible one?

Written by Roshan D'Souza

Aug 14,2025

Many Canadians pay off their mortgages each year without receiving any tax benefits. However, if you own a rental property or a rental basement unit, there is a legal strategy that can change this: it’s called Rental Cash Damming.

 

This approach allows you to convert your personal, non-deductible mortgage interest into deductible investment debt. The benefits of this method include larger tax refunds, faster mortgage repayment, and a more efficient use of the income generated from your rental property.

 

Here’s a simplified overview of how it works:

1. Use your rental income to pay down your home mortgage.
2. Re-borrow that same amount using a re-advanceable HELOC (Home Equity Line of Credit).
3. Use the borrowed funds to cover expenses related to your rental property.

Since the borrowed money is used for income-generating purposes, the Canada Revenue Agency (CRA) allows you to deduct the interest.

Why is this important?

– It is fully compliant with CRA regulations.
– It does not increase your overall debt.
– It could save you thousands of dollars in taxes over time.

 

To effectively implement this strategy, you need the proper mortgage setup, thorough record-keeping, and a basic understanding of how to manage your cash flow.

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