What Is a Cap Rate? The One Number to Understand Before Buying a GTA Rental
A cap rate sums up "how much return this property generates from rent" in one percentage — but it has a few commonly miscalculated traps
How do you calculate a cap rate, and what’s a good one?
Cap rate (capitalization rate) = net operating income (NOI) ÷ price (or market value) — a percentage measuring the annual return a property generates from rent, ignoring financing. The key is the NOI: annual rental income minus all operating expenses (property tax, insurance, repairs, vacancy, management, common-area utilities) but not the mortgage payment. Per 2026 market data, institutional Toronto apartment buildings run about 3.5–4.5%, while the small multiplexes individual investors buy run about 5–5.5%. There’s no universal “good number” — read it against location, age, leases, and your cost of capital.
Sources: GTA commercial real-estate cap-rate data (institutional vs small multiplex, 2026); Bank of Canada (June 2026 policy rate 2.25%); 5-year fixed mortgages ~4.0–4.3%, 5-year variable ~3.35% (mid-2026 market).
When a client asks “is this rental worth buying,” the first thing I do is run the cap rate. It’s not perfect, but it sums up “how much this property returns from rent” in one clean percentage you can compare across deals. Here’s how to calculate it, which expenses you must subtract, what a reasonable range looks like, and why in today’s rate environment the cap rate must be read against your borrowing cost.
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The formula: NOI ÷ price, and "net" is the key
⚠️Don’t fool yourself with “gross yield.” Sellers and listings often divide gross rent by price for a flattering number. What’s actually comparable is NOI after every operating expense — property tax, insurance, repairs, vacancy, management; don’t skip a single one.
Why the mortgage isn’t subtracted: cap rate measures the asset, not your leverage
What’s a "good" cap rate: it depends on type and location
A high cap rate isn’t necessarily good
ℹ️Cap rate and cash flow are two different things. Cap rate measures the asset’s return (no financing); cash flow measures what’s left in your pocket each month after leverage. Run both: one tells you “is this a good property,” the other tells you “can I carry this deal.”
Read it against rates: cap rate vs cost of borrowing
Frequently Asked Questions
Is a higher cap rate always better?
No. An unusually high cap rate often reflects higher risk or a weaker location (turnover, repairs, weak appreciation). Cap rate is the market pricing risk — stable assets are low and pricey, risky ones high and cheap. Ask “why is it this high?”
Do I subtract the mortgage when calculating NOI?
No. Cap rate deliberately excludes financing so it measures the asset itself and lets differently-leveraged buyers compare. Your actual cash flow (with the mortgage) is a separate calculation.
What’s a normal cap rate for a GTA rental?
Per 2026 data, institutional Toronto apartment buildings run ~3.5–4.5%, and small multiplexes for individual investors ~5–5.5%. It depends on location, condition, and leases — treat these as reference ranges only.
Why compare cap rate to the interest rate?
If the cap rate is below your mortgage rate, buying with leverage likely means negative cash flow — topping up monthly and betting on appreciation. Only when the cap rate exceeds borrowing cost does leverage amplify a positive return — especially important in the 2026 rate environment.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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