Financing an Investment Property in Ontario: Down Payment, Rental Income & Rate Rules

Financing an Ontario investment property differs from financing a home you live in on three fronts: a larger minimum down payment than an owner-occupied home requires (no default insurance is available), lenders counting only a discounted share of the rental income toward qualification, and the same federal stress test every borrower faces. Buyers closing years out, such as on pre-construction, can also lock in a rate long before the building is finished.

How Much Down Payment Do You Need for an Investment Property in Ontario?

A non-owner-occupied investment property in Ontario requires a larger down payment than an owner-occupied home, because investment properties don’t qualify for the mortgage default insurance that lets an owner-occupier buy with a much smaller down payment. Confirm the current minimums with a mortgage professional — that higher floor is a meaningful capital requirement that shapes how many properties an investor can carry at once.

The down payment threshold also marks where residential financing stops for multi-unit buildings. In Ontario, properties with up to four units are generally financed as residential, and once a building crosses into five-plus units it’s typically treated as commercial, which usually means a larger down payment and different underwriting. A handful of lenders extend residential treatment further — RBC, for example, will finance more units as residential, at the standard investment-property down payment, provided the building has no commercial component like a ground-floor retail unit. Confirm current unit thresholds and down-payment requirements with a mortgage professional, since they vary by lender and change over time.

How Do Lenders Treat Rental Income When You Apply for a Mortgage?

Lenders don’t count all of a rental property’s income dollar-for-dollar; instead they apply a discount, since rent can go unpaid or a unit can sit vacant. Policies vary widely: some lenders count only a smaller share of the lease amount, while others count a larger share of an appraiser’s market-rent estimate for the area, and a few will count nearly all of it if a current tenant is confirmed to be staying on with the new owner. That spread matters — the gap between a lender’s lower and higher rental-income add-back can amount to a meaningful chunk of qualifying income each month, which can be the difference between approval and decline on a marginal file.

Because the percentage and the income source (a signed lease vs. an appraiser’s rent range) differ lender to lender, it’s worth asking a broker to run the qualification math with more than one lender before assuming a purchase won’t work.

Fixed or Variable: Which Mortgage Rate Type Fits an Investment Property?

Most Ontario investors choose a fixed rate for an investment property, because a fixed payment is easier to plan a rental’s cash flow around and easier to qualify with, since the payment used in the debt-service calculation won’t change mid-term. A variable rate can lower the cost of borrowing when the prime rate falls, but because the payment moves with it, it also introduces more uncertainty into a rental’s monthly numbers — something worth weighing against how thin the property’s cash flow margin already is.

Does the Mortgage Stress Test Apply to Investment Properties?

Yes — every residential mortgage in Canada, investment property or not, must qualify under the federal mortgage stress test (confirm the current qualifying rate with a mortgage professional). On an investment property, that stress-test math stacks on top of the rental-income discount described above, so the combined effect of both rules — not just one — is what determines how much a buyer can actually borrow. Buyers estimating their own budget should run both the discounted rental income and the current stress-test rate before assuming a pre-approval will hold at the advertised rate.

Locking In a Rate Before You Close: Pre-Construction and Rate Holds

A rate hold lets a buyer secure today’s rate for a purchase that won’t close for months or years, which matters most for pre-construction, where the gap between signing and closing can run several years. Most lenders’ standard rate holds for a resale purchase are much shorter, but several offer extended, multi-year holds specifically for pre-construction contracts, sometimes paired with a firm (rather than conditional) approval that’s honoured at closing even if the buyer’s income situation has changed in the meantime. Buyers evaluating a pre-construction deposit should ask specifically whether the rate hold is firm and how long it’s guaranteed for, and confirm current terms with a mortgage professional — a rate advertised at signing means little if it isn’t locked through to closing.

Refinancing an Investment Property to Fund Your Next Purchase

Once an investment property has gained equity — through appreciation, mortgage paydown, or renovation — an owner can typically refinance up to a lender-set loan-to-value limit (confirm the current maximum with a mortgage professional) and use the proceeds toward a down payment on the next property. Because a refinance isn’t a sale, the cash pulled out isn’t subject to capital gains tax the way sale proceeds would be. Whether the interest on the larger mortgage is deductible against the property’s rental income depends on how the funds are used, under the CRA’s interest-tracing rules — confirm the treatment with a tax professional before assuming it applies. This is the core mechanism investors use to scale a portfolio without saving a fresh down payment for every purchase from employment income alone.