At some point in your investing career, you’re going to hit a wall with residential financing. It usually happens somewhere between property five and ten. Your personal debt service ratios are maxed. Lenders are looking at your T4 income and saying the numbers don’t work—even though every single one of your properties cash flows.
This is where commercial financing enters the picture. And for a lot of portfolio investors, it’s the move that unlocks the next phase of growth.
But here’s the thing. Commercial financing isn’t just “the next step.” It’s a fundamentally different product with different rules, different costs, and different risks. I’ve seen investors jump into it too early and pay unnecessarily high fees. I’ve also seen investors wait too long and leave years of growth on the table because they couldn’t qualify for another residential mortgage.
Let me walk you through exactly when and how to make this transition.
The Five-Unit Threshold: Where the Rules Change
In Canada, the dividing line is clear. Properties with one to four units are financed with residential mortgages. Properties with five or more units are financed with commercial mortgages. This isn’t optional—it’s how the system works.
But here’s what most investors miss: you can also choose to finance smaller properties commercially. A fourplex can go on a commercial mortgage if you want it to. You wouldn’t normally do this because residential terms are better, but in certain situations—like when you’ve exhausted your residential qualifying capacity—it makes perfect sense.
The real shift happens when you buy your first five-plus unit building, or when you decide to blanket several residential properties under one commercial facility.
DSCR-Based Qualification: Why It Changes Everything
Residential mortgages qualify based on you. Your income, your debts, your credit score. The property’s income helps, but at the end of the day, the lender is underwriting you as a borrower.
Commercial mortgages qualify based on the property. The primary metric is the Debt Service Coverage Ratio—DSCR. It measures whether the property’s income can cover the mortgage payments.
DSCR = Net Operating Income / Annual Debt Service
A lender typically wants to see a DSCR of 1.20 or higher. That means the property earns 20% more than the mortgage payment.
Let’s run an example. You own a six-unit apartment building. The numbers look like this:
| Line Item | Annual Amount |
|---|---|
| Gross Rental Income | $108,000 |
| Vacancy Allowance (5%) | -$5,400 |
| Operating Expenses | -$38,000 |
| Net Operating Income (NOI) | $64,600 |
| Annual Mortgage Payment | $49,000 |
| DSCR | 1.32 |
A DSCR of 1.32 means the property produces 32% more income than needed to cover the debt. That’s a solid number that most commercial lenders will approve.
Here’s why this matters for portfolio investors: your personal income is almost irrelevant. You could have zero employment income, and as long as the property’s NOI supports the debt, you qualify. This is the breakthrough moment for investors who’ve been hitting residential qualifying ceilings.
The Commercial Appraisal Process: A Different Animal
If you’ve only dealt with residential appraisals, commercial appraisals will feel like a different world. And they are.
Residential appraisals are based primarily on comparable sales. What did similar houses sell for nearby? That’s your value.
Commercial appraisals use three approaches, and the income approach typically carries the most weight:
Income Approach. The appraiser calculates the property’s NOI and applies a capitalization rate to determine value. If your NOI is $64,600 and the market cap rate for similar buildings is 5.5%, the income-based value is $64,600 / 0.055 = $1,174,545.
Cost Approach. What would it cost to build this building today, minus depreciation, plus land value? This sets a ceiling on value.
Sales Comparison. What have similar apartment buildings sold for? This validates the income approach.
The income approach matters most because it means your property management directly affects the appraised value. Higher rents, lower vacancies, and controlled expenses all increase your NOI, which increases your value, which increases how much you can borrow.
This is powerful. With residential properties, you’re mostly at the mercy of the housing market. With commercial properties, you can directly influence your appraised value by improving operations.
Pro tip: Before ordering a commercial appraisal, spend three to six months getting rents to market rates and stabilizing occupancy. A fully occupied building with market rents will appraise significantly higher than one with below-market rents and a vacant unit.
Term and Amortization Differences
This is where commercial financing can surprise you if you’re not prepared.
| Feature | Residential Mortgage | Commercial Mortgage |
|---|---|---|
| Amortization | Up to 25-30 years | Typically 20-25 years |
| Term | 1-5 years typical | 1-5 years typical |
| Rate Type | Fixed or variable | Often fixed, some floating |
| Rate Premium | Lower | 0.5%-2.0% higher |
| Prepayment Penalties | Standard (3 months interest or IRD) | Can be severe (yield maintenance, defeasance) |
| Renewal | Usually automatic | May require full re-qualification |
| Fees | Lower origination costs | Higher (appraisal, legal, environmental) |
The shorter amortization is the biggest practical difference. A 20-year amortization on a commercial mortgage means higher monthly payments than a 25-year residential mortgage for the same loan amount. This directly affects your cash flow and DSCR calculation.
Let’s compare. On a $700,000 mortgage at 5.5%:
- 25-year amortization: $4,283/month
- 20-year amortization: $4,821/month
That’s $538 per month more—or $6,456 per year. On a six-unit building, you need roughly $1,075 more per unit annually in NOI to maintain the same DSCR. Make sure you account for this when analyzing commercial deals.
Recourse vs. Non-Recourse: Understanding Your Personal Exposure
With residential mortgages in Canada, you personally guarantee the loan. Full recourse. If the property goes into foreclosure and sells for less than the mortgage balance, the lender comes after you for the difference.
Commercial financing offers the possibility of non-recourse lending, though it’s less common in Canada than in the US. Here’s the breakdown:
Full recourse means the lender can go after your personal assets if the property doesn’t cover the debt. Most Canadian commercial mortgages for smaller buildings (under $5 million) are full recourse.
Limited recourse means the lender’s recovery is limited in some way. You might personally guarantee a portion of the loan—say 50%—while the rest is secured only by the property. Some CMHC-insured commercial loans offer this.
Non-recourse means the lender can only seize the property. Your personal assets are protected. In Canada, this is typically only available for large institutional-quality deals ($10 million and up) or CMHC-insured multifamily mortgages.
CMHC Multi-Unit Insurance is worth knowing about. For rental buildings with five or more units, CMHC will insure the mortgage, which gives you several advantages: lower interest rates (often 1% to 1.5% below uninsured commercial rates), longer amortizations (up to 40 years for new construction, 35 years for existing), and limited recourse. The trade-off is an insurance premium of 1% to 4.5% of the loan amount, plus CMHC’s requirements around rental rates and building condition.
Refinance Timing: When to Make the Switch
Not every residential property should move to commercial financing. Here’s my decision framework:
Move to commercial when:
- You’ve maxed out your residential qualifying capacity and need to free up room for new purchases
- You’re acquiring a five-plus unit building (you don’t have a choice)
- You want to consolidate multiple residential properties under one blanket commercial mortgage to simplify your portfolio
- The property’s NOI easily supports the commercial terms (DSCR of 1.25 or higher)
- You’re holding the property in a corporation and the lender requires commercial terms
Stay residential when:
- You still have residential qualifying room
- The property is a single-family home or small duplex with thin cash flow that won’t support commercial amortization
- You plan to sell within a few years (commercial prepayment penalties can be brutal)
- The rate premium would turn a cash-flowing property into a break-even or negative cash flow situation
The blanket mortgage play. This is a strategy more investors should know about. Instead of having six separate residential mortgages, you can refinance multiple properties under one commercial blanket mortgage. One payment, one renewal date, one lender relationship. The lender looks at the combined NOI of all properties against the total debt. Individual properties that might not qualify on their own can be carried by stronger performers in the portfolio.
The risk? If you default, the lender has a claim on all the properties in the blanket—not just the one causing problems. Cross-collateralization is a double-edged sword.
The Transition Process Step by Step
Here’s what the actual conversion looks like:
Step 1: Get your financials in order. Commercial lenders want to see two to three years of operating history for the property. Pull together your rent rolls, expense reports, and tax returns. If your bookkeeping has been casual, clean it up before you apply. Sloppy financials kill commercial mortgage applications.
Step 2: Talk to a mortgage broker who does commercial deals. Not all brokers handle commercial lending. You need someone who knows the commercial lender landscape—which CMHC-approved lenders are active, which credit unions do small commercial, and which institutional lenders are offering competitive terms right now.
Step 3: Get a Phase I Environmental Assessment if required. Most commercial lenders require this for any building with a commercial component or certain building ages. Budget $2,000 to $4,000 for this.
Step 4: Order the commercial appraisal. This costs $3,000 to $6,000 depending on the property size and complexity. The appraiser will need full financial records, rent rolls, and property access.
Step 5: Negotiate terms. Commercial mortgages are more negotiable than residential ones. The rate, prepayment terms, amortization period, and covenant requirements can all be discussed. Don’t just accept the first term sheet.
Step 6: Legal review. Commercial mortgage documents are longer and more complex than residential ones. Your lawyer should be experienced with commercial lending. Budget $2,000 to $5,000 in legal fees for the transaction.
Total transition costs typically run $8,000 to $18,000 depending on the property and deal complexity. Factor this into your analysis. The switch only makes sense if the benefits—more borrowing capacity, better scaling, or portfolio simplification—outweigh these upfront costs.
What Your Portfolio Structure Looks Like After the Switch
A well-structured scaled portfolio often has a mix of financing types:
- Properties 1-4: Residential mortgages with A lenders at the best rates
- Properties 5-8: Residential mortgages with B lenders or credit unions
- Properties 9+: Commercial mortgages, possibly under a blanket structure
- Five-plus unit buildings: Commercial or CMHC-insured commercial mortgages
This isn’t a rigid formula. The right mix depends on your properties, your income, and your growth plans. But the pattern holds true for most Canadian portfolio investors: you start residential, layer in alternative residential lenders, and eventually transition the portfolio toward commercial financing as you scale.
The key is making this transition intentionally, with a plan, rather than being forced into it because you’ve exhausted every other option. If you plan ahead, you can time your commercial conversions to coincide with renewal dates, minimizing prepayment penalties and transaction costs.
Frequently Asked Questions
Ready to explore your financing options? Book a free strategy call with LendCity and let our team help you find the right path forward.
Can I convert a fourplex from residential to commercial financing?
What DSCR do I need for a commercial mortgage approval?
How much more expensive is commercial financing compared to residential?
What's a blanket mortgage and should I use one?
Do I need a corporation to get commercial financing?
What happens at renewal on a commercial mortgage?
Can I get CMHC insurance on a commercial rental property?
How long does a commercial mortgage application take?
Disclaimer: LendCity Mortgages is a licensed mortgage brokerage. Content on this page is for educational purposes only and does not constitute legal, tax, investment, securities, or financial-planning advice. Rates, premiums, program terms, and regulations referenced are as of the page's last updated date and are subject to change. Any investment returns, rental yields, tax savings, or case-study figures shown are illustrative only — they are not guaranteed, not typical, and individual results will vary. Consult a licensed lawyer, Chartered Professional Accountant, or registered dealer before acting on any information above. Editorial standards.
Written by
LendCity
Published
August 10, 2026
Reading time
10 min read
A Lender
A major bank or institutional lender offering the most competitive mortgage rates and terms but with the strictest qualification criteria, including full income verification and stress test compliance. Most investors use A lenders for their first four to six properties.
Amortization Period
The total number of years required to fully repay a mortgage through regular principal and interest payments. In Canada, standard amortization periods for residential properties are 25 years, while multifamily properties through MLI Select can extend up to 50 years. A longer amortization reduces monthly payments but increases total interest paid.
Amortization
The period over which a mortgage is scheduled to be fully paid off through regular payments of principal and [interest](/glossary/#interest-rate). In Canada, common amortization periods are 25 or 30 years, though the mortgage term (when you renegotiate) is typically 1-5 years. A longer amortization lowers monthly payments, improving [cash flow](/glossary/#cash-flow) but increasing total interest paid.
Appraisal
A professional assessment of a property's market value, required by lenders to ensure the property is worth the loan amount.
B Lender
Alternative lenders that serve borrowers who don't qualify with major banks, offering slightly higher rates with more flexible criteria.
Below-Market Rent
Rental rates lower than comparable properties in the same area. Below-market rents represent a value-add opportunity where an investor can increase property value by raising rents to market levels.
Blanket Mortgage
A single mortgage that covers multiple properties, often used by investors to simplify financing for a portfolio. Allows release of individual properties as they're sold.
Cap Rate
Capitalization Rate - the ratio of a property's [net operating income (NOI)](/glossary/#noi) to its current market value or purchase price. A 6% cap rate means the property generates $60,000 NOI annually on a $1,000,000 value. Used to compare investment properties regardless of financing. See also [DSCR](/glossary/#dscr) and [Cash-on-Cash Return](/glossary/#cash-on-cash-return).
Capitalization Rate
The Capitalization Rate (Cap Rate) is calculated by dividing a property's Net Operating Income by its market value or purchase price. A 5.5% cap rate on a $2 million apartment building means $110,000 annual NOI. Cap rate is a standardized metric for comparing multifamily investments independent of financing structure, with higher cap rates generally indicating higher risk or better value.
Capitalization
The total value of a property based on its income-producing potential, calculated by dividing NOI by the cap rate. Also refers to the overall investment structure and the amount of debt versus equity used to acquire a property.
Hover over terms to see definitions. View the full glossary for all terms.