When you borrow money to buy an income-producing asset such as a rental property, the interest on that borrowing is generally tax-deductible under CRA rules. The catch is the cost to access that money. If you break your mortgage mid-term or refinance to fund the rental, the penalty might outweigh the tax benefit.
This is where a broker and a CPA can run the real numbers for your situation. Pekoe Mortgages is FSRA licensed in Ontario (Licence #13321) and RECA licensed in Alberta, and we work with investors on this exact question.
What Makes Mortgage Interest Tax-Deductible in Canada?
The CRA applies a straightforward test. If you borrow money and use it to earn income, the interest on that borrowing is deductible. If you borrow to buy your own home, it is not.
A rental property qualifies as income-earning, because the rent flows to you or your corporation. So the interest you pay to buy or improve that property is generally deductible. The critical word is “use”, because the CRA wants to see that the borrowed money was actually deployed to acquire the rental, not mixed with personal funds.
How Does Buying a Rental Create Deductible Interest?
To move equity from your home into a rental purchase, you have three main paths. Each has a different cost to access the money.
Refinancing mid-term: You break your current mortgage and replace it with a larger one. The additional borrowing is tied to the rental, so its interest is generally deductible. The downside is that breaking early usually triggers a penalty, the greater of three months’ interest or the Interest Rate Differential (IRD).
Using a HELOC: You set up a home equity line of credit and draw funds to buy the rental. A HELOC carries no breakage penalty, and interest on funds used for the rental is generally deductible. The trade-off is that a HELOC usually has a higher rate than a fixed mortgage.
Waiting for renewal: If your mortgage matures soon, you can refinance at renewal with no penalty and use the proceeds for the rental. This route is penalty-free, but the timing has to line up with your renewal date.
What Does “Breaking” Your Mortgage Actually Cost?
If you break a fixed-rate mortgage before maturity, the lender charges a break fee. The most common one is the Interest Rate Differential (IRD), based on the gap between your rate and the lender’s current rate, applied across the remaining term and balance.
On a large balance with a wide rate gap and years remaining, the IRD can run into five figures. The alternative is three months’ interest, which is simply three months of interest on your balance, and the lender charges whichever is larger. Confirm which penalty applies with your lender before you refinance.
Our mortgage penalty guide breaks down exactly how these penalties are calculated.
Weighing the Penalty Against the Deduction
A simple framework helps clarify whether breaking your mortgage makes sense. The table compares the main ways to fund the rental.
| How You Fund the Rental | Interest Deductible? | Cost to Access the Money |
|---|---|---|
| Refinance your home mid-term | Generally yes (money used to earn income) | Possible penalty (IRD or three months’ interest) |
| Borrow via a HELOC | Generally yes | No breakage penalty; typically higher interest rate |
| Wait for renewal, then refinance | Generally yes | No penalty at maturity |
| Use non-registered savings | Interest question does not arise | Opportunity cost only |
Here is an illustrative example, not a quote. Say you refinance to pull $100,000 of equity for a rental at roughly 5%, which is about $5,000 of interest in the first year. If your marginal tax rate is 40%, deducting that interest saves you roughly $2,000 in tax that year.
You weigh that yearly saving against the one-time cost to access the money. If breaking your current mortgage costs $6,000 today, the deduction takes a few years to catch up, so the rental’s own return has to carry the rest. This is exactly the math a broker and a CPA run together for your real numbers.
Tracing and Documentation
The CRA does not take the deduction on faith. If you deduct the interest, you must show that the borrowed money was used to acquire or improve the rental. This is called tracing.
The best practice is to open a separate account and fund the rental directly from it. If the refinanced proceeds land in that account and the rental purchase draws from it, the trail is clean. If you mix the money with personal spending and later argue that some of it went to the rental, you invite CRA scrutiny.
This same discipline applies to the Smith Manoeuvre and cash damming, which both rely on clean tracing. Keep records of the flow from the mortgage advance to your account to the lawyer’s trust account to the seller.
Common Mistakes
Most investors trip up by mixing funds or misjudging which part of the mortgage is deductible. Three mistakes come up again and again.
Assuming the whole mortgage becomes deductible. If you refinance a $500,000 home mortgage up to $550,000 and use $50,000 for a rental, only that $50,000 and its interest are deductible. The original $500,000 stays non-deductible personal debt.
Commingling funds. If refinance proceeds hit your chequing account, you pay some bills, and then you send money to the rental, the CRA can question whether the rental was funded from the refinance at all. A separate account avoids this.
Not telling your accountant. Your return must report the rental income and the interest deduction with supporting records. Deducting interest your accountant does not know about leaves the return incomplete and can attract an audit.
Frequently Asked Questions
Is mortgage interest tax-deductible on a rental property in Canada?
Yes, if the borrowed money was used to buy or improve the rental and is properly traced. The CRA rule is that interest on money borrowed to earn income is deductible, while interest on money borrowed for personal use is not. Keep clear records showing the money went to the rental.
Can I deduct interest if I refinance my home to buy a rental?
Generally yes, but only on the portion of the refinance used to buy the rental. If you pull $50,000 to buy a rental, the interest on that $50,000 is deductible. The rest of your mortgage stays non-deductible.
Does breaking my mortgage cost more than the tax savings?
It depends on your penalty, your marginal tax rate, and how long you hold the rental. If the penalty is high and your tax rate is low, breaking might not pencil out. A broker and an accountant should model it together before you decide.
Do I need to keep the borrowed money in a separate account?
Yes, it is the clearest way to show the CRA that the money went to the rental and not to personal spending. Move the refinance proceeds to a designated account and pay the rental purchase from there. This is the same discipline required for cash damming and the Smith Manoeuvre.
Should I talk to an accountant or a broker first?
Both, in that order. Start with a broker to model the cost of breaking or refinancing and the net funds available. Then take those numbers to a CPA to model the tax benefit for your situation.
Making the Decision
You have several ways to access equity for a rental, each with different tax and cost effects. Breaking mid-term gives immediate access but may carry a stiff penalty. A HELOC avoids the penalty but usually costs more in interest, and waiting for renewal is penalty-free but needs the right timing.
A broker and a CPA working together can run the actual numbers for your situation. Have a question? Chat with our team or AI assistant directly on pekoe.ca.
Ready to weigh your options? Contact Pekoe.ca to talk through borrowing to buy a rental property.
