• Down Payment Requirements

The most immediate difference is the minimum down payment. For a primary residence, CMHC mortgage insurance allows you to put as little as 5% down. Investment properties do not qualify for CMHC insurance, which means you must bring a minimum of 20% down for a 1-to-4 unit residential investment property. Many institutional lenders quietly prefer 25%, and some require it outright for certain property types or markets. For properties with five or more units, you leave the residential lending world entirely and enter commercial financing, where down payment requirements typically run 25% to 35% or more.

• How Lenders Calculate Rental Income

When you apply for an investment property mortgage, the lender does not simply add the full rent roll to your income. Two main approaches exist, and which one your lender uses significantly affects how much you can qualify for.

The 50% offset rule is the most common approach among big banks: the lender counts 50% of the gross rental income and applies it as an offset against the carrying costs of the investment property. The logic is that approximately half of gross rent is consumed by vacancies, maintenance, taxes, and management. This approach is relatively conservative and often limits qualification for investors with multiple properties.

The rental income add-back approach is used by some monoline and alternative lenders: they add a portion of rental income directly to your qualifying income. This is more generous and can materially improve your debt-service ratios. Knowing which approach your lender uses — before you write the offer — is critical.

• Rate Premiums on Investment Properties

Investment property mortgages carry higher interest rates than primary residence mortgages, typically 20 to 50 basis points above comparable primary residence rates at A-lenders. This premium exists because lenders historically see higher default rates on investment properties — when financial stress hits, owners are more likely to default on a rental than on the home they live in. Over a 25-year amortization, even a 30-basis-point premium adds up to a meaningful amount of additional interest. Factor this premium into your cash flow projections from the start rather than using primary residence rate assumptions.

• Conventional vs. Portfolio Lenders

Big banks and federally regulated lenders apply the OSFI stress test to investment purchases, qualifying you at the higher of the contract rate plus 2% or 5.25%. Alternative and private lenders are not bound by OSFI guidelines, which can make them a more flexible path — but at a significantly higher rate. The strategy many experienced investors use is to qualify with A-lenders for as long as possible, then move to portfolio or commercial lending as the property count grows and A-lender guidelines become a constraint.

• Using Existing Equity as Your Down Payment

One of the most common paths to investment property financing is using equity from a property you already own. If your primary residence or an existing investment property has appreciated in value, you may be able to access that equity through a HELOC (home equity line of credit), a cash-out refinance, or a secured line of credit. A HELOC is often the most flexible option: you borrow only what you need, when you need it, and the credit is revolving. A refinance provides a lump sum but resets your mortgage terms. Either way, the equity you pull becomes the down payment on the next property — a mechanism that experienced investors call “recycling equity.” Be aware that using borrowed funds as a down payment further concentrates your leverage risk, so stress-test both properties under a rising rate scenario before proceeding.

• Joint Venture Financing

If capital is the limiting factor, a joint venture (JV) is a legitimate path that many Canadian investors use. In a typical JV, one partner brings the capital (the down payment) and another brings the expertise — finding the deal, managing the renovation, overseeing the property. Profits and equity are split according to the JV agreement. JV structures are flexible and can be tailored to any combination of skills and capital. The critical requirement is a well-drafted joint venture agreement prepared by a real estate lawyer that specifies how decisions are made, how profits are split, what happens if one partner wants to exit, and what happens if the property needs additional capital. A handshake JV with a friend is a recipe for conflict.

• Commercial Financing for 5+ Unit Properties

Once a property has five or more units, it is classified as a commercial property for lending purposes. This is an entirely different lending world. Commercial lenders underwrite based on the property's net operating income (NOI) rather than on your personal income. The key metric is the debt service coverage ratio (DSCR): the property's NOI divided by annual debt service. Most commercial lenders want a DSCR of at least 1.20, meaning the property's income must cover debt payments with 20% to spare. The upside of commercial lending is that personal income becomes less of a constraint as properties scale; the downside is higher rates, shorter amortization periods (often 20-25 years), and more complex underwriting. Working with a commercial mortgage broker is strongly recommended for this segment.

• The Case for a Specialist Mortgage Broker

The complexity of investment property financing makes a specialist mortgage broker worth their weight. Not all brokers are equally experienced with investment properties — some primarily handle first-time buyer mortgages and may not know which lenders use the add-back method or which ones are open to portfolio lending. A broker who focuses on investor clients will know which lenders count rental income most generously, which ones allow the most properties, and how to structure your application to maximize what you can qualify for. Given that a better rate or a more generous rental income treatment can change your qualifying purchase price by hundreds of thousands of dollars, the broker choice matters enormously.

• Personal vs. Corporate Ownership Structure

Before financing an investment property, the structure question deserves serious attention: should you hold the property personally or inside a corporation? Holding personally is simpler and often involves lower mortgage rates (some lenders charge a premium for corporate-held properties). Holding inside a corporation can offer tax deferral advantages once rental income exceeds personal income needs, and provides liability separation. However, the tax treatment is complex and varies with your personal income level, province, and plans for the property. This is a conversation to have with a qualified accountant before purchasing — not after. Changing the structure after purchase can trigger land transfer tax and other costs that erode the benefit.

• Questions to Ask Your Mortgage Broker

Before committing to a lender for an investment property, ask specifically how they treat rental income in their debt-service calculations. Ask whether they apply the 50% offset or an add-back approach, and what documentation they require to use rental income at all (signed lease, property income history, or a market rent letter from an appraiser). Ask how many investment properties they will finance before switching to portfolio or commercial lending. Ask whether the rate quoted applies to a property held personally or whether a corporate hold changes the rate. These questions reveal quickly whether a lender understands investment lending — and give you the information to compare lenders on an apples-to-apples basis.

• The Bottom Line

Investment property financing in Canada rewards preparation. The investors who close deals efficiently are those who understand the rules before approaching lenders — who know their qualifying ratios, who have assembled their documents, who have already spoken with an accountant about structure, and who have a broker relationship with someone who specializes in this space. The financing is genuinely more complex than a primary residence mortgage, but it is navigable when approached systematically.