Rental Property ROI, Explained

Before you buy a rental, one question matters more than the listing photos: what return will it actually earn? Rental property ROI sounds intimidating, but it comes down to a few simple formulas. Master cash flow, cap rate and cash-on-cash return, and you'll be able to size up any deal in minutes — and walk away from the bad ones with confidence.

Key takeaways

• ROI measures what a rental earns relative to what you put in — there isn't one single formula.
• Cash flow = rent minus all operating costs and mortgage; it must be realistic, not optimistic.
• Cap rate = net operating income ÷ purchase price, ignoring financing.
• Cash-on-cash return measures annual cash flow against the actual cash you invested.
• HOMEH's Cashback Rebate, the industry's highest, lowers your cash invested, which can lift your return.

What ROI really means for a rental

ROI — return on investment — measures what a property earns relative to what you put in. There isn't one magic number; investors use a few complementary measures, each answering a slightly different question. Together they tell you whether a rental will put cash in your pocket, how it stacks up against other properties, and how hard your invested dollars are working. For the bigger picture, start with how to invest in real estate in Canada and the Ontario housing market outlook.

Step 1: Calculate cash flow

Cash flow is the foundation. It's simply the money left over each month after every cost is paid. The formula: Cash flow = rental income − operating expenses − mortgage payment. Operating expenses must be realistic: property tax, insurance, a vacancy allowance, maintenance, and management if you use it.

Positive cash flow means the property pays you to own it. Negative cash flow means you're subsidizing it every month — sometimes acceptable for a strong appreciation play, but always go in with eyes open.

Step 2: Calculate the cap rate

The capitalization rate lets you compare properties regardless of how they're financed. The formula: Cap rate = net operating income ÷ purchase price, where net operating income (NOI) is rent minus operating expenses but before the mortgage.

Cap rate worked example

Using round numbers (example): a property with annual NOI of $24,000 and a purchase price of $480,000 has a cap rate of $24,000 ÷ $480,000 = 5%. A higher cap rate means more income per dollar of price, but often more risk. Learn what's reasonable in our guide to a good cap rate.

Step 3: Cash-on-cash return

Cap rate ignores your mortgage; cash-on-cash return doesn't. It measures your annual cash flow against the actual cash you invested. The formula: Cash-on-cash = annual cash flow ÷ total cash invested (down payment + closing costs + any upfront repairs).

Don't forget appreciation and paydown

Cash flow and cap rate capture today's income, but two more forces build wealth over time: appreciation and mortgage paydown. Both add to your equity even in a year of modest cash flow — which is why they're central to building a real estate portfolio. Just be careful not to count on appreciation you can't control; we never predict specific future prices, so model deals on cash flow first and treat appreciation as upside.

Verify rents and prices with real data

Your ROI is only as good as your inputs. Confirm realistic rents and prices on the HOMEH Market Watch tool and choose your market with our guide to the best cities to invest in Ontario.

Putting it together

Run all three numbers — cash flow, cap rate and cash-on-cash — before any purchase, using conservative inputs. If a deal only works with optimistic rents and zero vacancy, it doesn't work. A higher-cash-flow option like a multiplex can improve every one of these figures at once.

Lower your cash invested, raise your return

Because cash-on-cash return rises as the cash you invest falls, HOMEH cashback can directly improve it. Eligible buyers get the industry's highest Cashback Rebate — estimate yours with the cashback calculator and browse income properties.