A rental has positive cash flow when the rent covers the mortgage and every running cost with money left over, so you never top it up from your own income. This page covers the full cash flow formula, two worked examples, where in Canada rent is highest relative to price, and the ways investors improve cash flow on a property. It is part of WealthNorth’s guide to real estate investing in Canada. Whether positive cash flow is achievable depends mostly on the price relative to the rent and on how the deal is financed.
The Complete Cash Flow Formula
| Component | Direction | Notes |
|---|---|---|
| Gross monthly rent | + | 100% occupancy, market rents |
| Vacancy allowance | − | A share of rent, set from local vacancy rates and expected turnover |
| Mortgage payment (P+I) | − | Based on actual financing |
| Property tax | − | Annual amount ÷ 12 |
| Insurance | − | Landlord (not homeowner) policy |
| Maintenance reserve | − | A yearly reserve for repairs and replacements ÷ 12 |
| Property management | − | A percentage of collected rent, plus any leasing fees |
| Utilities (if landlord-paid) | − | Heat, water, hydro where applicable |
| Condo fees (if applicable) | − | Full amount monthly |
| Monthly Cash Flow | = | Positive = surplus; negative = subsidy required |
Two worked examples
Both duplexes are bought with 20% down at an example 4.99% rate over 25 years, with a 5% vacancy allowance, a maintenance reserve of 1% of the price a year and 10% property management. Prices, rents and costs are illustrative assumptions.
| Monthly | $650,000 duplex | $290,000 duplex |
|---|---|---|
| Rent (two units) | $3,200 | $2,600 |
| Less 5% vacancy | $3,040 | $2,470 |
| Property tax | −$417 | −$250 |
| Insurance | −$130 | −$100 |
| Maintenance reserve (1% of price a year) | −$542 | −$242 |
| Property management (10%) | −$304 | −$247 |
| Mortgage payment | −$3,021 | −$1,348 |
| Cash flow | −$1,374 | +$283 |
The cheaper duplex earns less rent per unit but costs less than half as much, so its rent covers the mortgage and every cost. The expensive one needs $1,374 a month from the owner. The difference is almost entirely the price relative to the rent; to test a specific property, use the rental property calculator.
Where rent is highest relative to price
Gross yield (annual rent divided by price) is the quickest way to compare markets. Best cities for investment property ranks major cities by gross yield using current condo prices and asking rents, alongside vacancy rates and rent trends. Where prices are high relative to rents, positive cash flow is harder to reach with a standard down payment; the table shows which markets that currently applies to. Cap rate explained covers how the income yield after costs compares with your mortgage rate.
The appreciation vs cash flow trade-off
| Strategy | Monthly cash flow | Long-term equity | Who it tends to suit |
|---|---|---|---|
| Cash flow first | Positive from the start | Builds more slowly where prices grow slowly | Investors who want the property to pay its own way |
| Balanced | Around break-even | Moderate | Most investors who can absorb small shortfalls |
| Appreciation first | Negative, often by hundreds a month or more | Depends on prices rising | Investors with high income, reserves and a long horizon |
How to improve cash flow on a property
| Strategy | How it helps | Trade-off |
|---|---|---|
| A larger down payment | Smaller mortgage payment | Ties up more capital and lowers the cash-on-cash return |
| Adding a legal suite | A second rent from the same property | Permits, construction cost and municipal approval |
| Renting by the room | Higher total rent | More turnover and management; local licensing rules |
| Buying below market and renovating | Better price relative to rent | Renovation risk; see the BRRRR strategy |
| Avoiding high condo fees | Lower fixed costs | Freehold properties bring their own maintenance |
| Self-managing | Saves the management fee | Your time; see the property management guide |
Rent control and cash flow
Rent rules limit how fast income can grow on a unit with a tenant in place. In Ontario, units first occupied for residential purposes on or before November 15, 2018 are subject to the annual guideline for sitting tenants (2.1% for 2026); newer units are exempt, and any unit can be re-rented at market rent between tenants. Other provinces’ caps are in rent increase rules by province. Buying with a long-term tenant paying well below market means the gap may take years to close.
Bottom line
Positive cash flow still exists in Canada, mostly where rent is high relative to price, and it has to survive a complete model that includes vacancy, a maintenance reserve and management. In the most expensive cities, negative cash flow is the normal result for a new purchase with the minimum down payment, which makes those properties a bet on appreciation. Whether that bet is worth it is covered in is buying a rental property worth it.
Sources
The figures and rules on this page come from these sources, last checked against them between September 24, 2026 and October 2, 2026. How we check facts.
- Bank of Canada: Conventional 5-year mortgage rate (data series)
- Bank of Canada: Conventional 5-year mortgage rate (data series)
- Bank of Canada: Conventional 5-year mortgage rate (data series)
- Bank of Canada: Data table