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How to turn your non-deductible mortgage into a tax-deductible investment loan — MarketVault
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How to turn your non-deductible mortgage into a tax-deductible investment loan

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Stop letting your rental income sit idle in a standard checking account. If you own rental properties in Canada, you are likely missing out on a massive tax-efficiency opportunity known as Cash Damming. In this video, I show you exactly how to convert the debt on your primary residence into a tax-deductible investment loan using your rental income. 🚀 WHAT YOU'LL LEARN • The mechanics of the Cash Damming strategy. • How to convert non-deductible mortgage debt into tax-deductible debt. • Why your rental income should be used as a prepayment tool. • How to use a HELOC to fund property expenses for maximum tax efficiency. • The impact this has on your mortgage amortization timelines. 📈 THE STRATEGY EXPLAINED Most homeowners view their primary residence mortgage and their rental property expenses as two completely separate financial silos. They pay the mortgage with after-tax dollars and pay the rental expenses with after-tax dollars. This is highly inefficient. Cash Damming flips the script. Instead of using your rental income to pay for your own rental expenses, you use that rental income to make a prepayment on your non-deductible primary residence mortgage. Simultaneously, you use a Home Equity Line of Credit (HELOC) attached to your primary residence to pay for your rental property expenses. Because the money used to pay the rental expenses is now being 're-lended' through the HELOC, that debt becomes a tax-deductible investment loan. You are essentially shifting the debt from a non-deductible category (your home) to a deductible one (your investment). This creates a massive tax advantage. By paying down your primary mortgage with rental income and using a HELOC for expenses, you create a deductible interest expense that you didn't have before. This produces an additional tax refund through interest deductibility, which you can then loop back into your primary mortgage to shave 5 to 15 years off your amortization. It is a cycle of converting bad debt into ef



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Added 23 Jun 2026