Rental Property: Test Financing and Cash Flow
Test the cash flow with cautious rental income after vacancy, then subtract taxes, maintenance, insurance and management.

In this article
A rental building is sold on its advertised cash flow, but it is bought on a cash flow rebuilt in four layers. First, cautious income: the signed leases rather than the posted rents, minus a vacancy allowance. Then complete expenses: taxes, rental-building insurance, maintenance at about 1% of value, snow removal and a management provision, even if you manage it yourself. Then the financing: down payment depending on occupancy, and only a fraction of the rents counted toward qualification. Finally the stress test: the payment must stay bearable for a few months with no rent at all, and the repair reserve is set up before the first tenant arrives. The maximum reasonable price comes out of this calculation, not the sales sheet, and the gap between the two separates an asset from a burden. This article runs the four layers through one fully worked case, the calculation that decides whether a building deserves an offer.
Check the advertised income against the signed leases
A rental building is sold on its advertised income, but it is bought on its proven income. The signed leases give the real amounts, the end dates and the vacant units. The listing sheet often gives the seller's ambition. The gap between the two routinely runs to thousands of dollars a year. Then calculate the working income cautiously: the rents in the leases, minus a realistic vacancy allowance, which is one month per unit every two years in a normal market and more in a softer area. Leases nearing expiry deserve particular attention, since a departing tenant can reveal that the recorded rent was above market. That cautious income becomes the only basis for every calculation that follows.
Price the expenses in full
Listing sheets show the municipal and school taxes and often stop there. The complete picture adds rental-building insurance, which costs more than residential insurance, routine maintenance, estimated at about 1% of value per year, snow removal and grounds upkeep, the services included in the leases (heat or electricity as the case may be) and a management provision, even if you manage it yourself. Your time collecting rent, showing units and handling emergencies has a value, and it will become an expense the day you delegate. The reserve for major repairs completes the list: roof, balconies, windows and furnace will eventually give out. Their provision belongs to operating costs, not to surprises.
Test the financing and its own rules
Financing an income property follows different rules from financing a residence. The required down payment depends on the number of units and on whether you occupy one of them. The lender counts only a fraction of the rents toward qualification, using its own method, often half or less for buildings not occupied by the owner. Ask precisely about these two rules before setting a maximum price, since they determine the amount you can really borrow, often well below what gross income suggested. The lender's appraisal can also differ from the negotiated price, and the gap is covered in cash. A preapproval based on the target building, and not just on your salary, avoids bad surprises between the offer and the disbursement.
Simulate the quarter without rent
The deciding test runs on a realistic adverse scenario: three months without rental income for one unit, a tax increase and a major repair in the same year. If the mortgage payment then requires the credit card or the line of credit, the price is too high or the reserve too thin. This test sets the reasonable maximum price, often clearly below the asking price, and your offer starts from that figure rather than the listing's. Set up the repair reserve before taking possession, not after the first emergency. A building bought without a reserve puts every surprise on the owner's personal credit. A building that passes this test at your price becomes an asset. One that passes only at the seller's price remains a bet. Test at your own number.
Quebec scenario
A Saint-Jérôme duplex listed at $520,000 tempts a couple of nurses: the advertised rents, $2,900 a month combined, seem to carry the financing on their own. Before making an offer, the couple puts the building through a four-layer reality test. Revenue first: the actual leases show $2,650, and one month of vacancy per unit every two years brings the cautious figure to about $2,480. Then expenses, the ones sales sheets leave out: $6,200 in taxes, rental-building insurance that costs more than residential, maintenance estimated at 1% of value, snow removal, and a management provision even though they will manage it themselves, because their time is not free. The financing demands its own down payment, higher than a residence's depending on occupancy, and the lender counts only a fraction of the rents toward qualification. The final test is the hardest: the payment must stay bearable for three months with no rent at all, as in a bad start to a lease or unexpected repairs. Their budget passes the test at $480,000, not at $520,000. The offer goes in at that price and is refused. Six weeks later, a comparable building accepts $472,000, and the $15,000 repair reserve is set up before the first tenant ever visits.
Checklist
- Rebuild the income from the signed leases
- Subtract a vacancy allowance
- List every expense the sheets omit
- Add a management provision even when self-managing
- Verify the down payment and counted rent fraction
- Test the payment with no rent for a few months
- Fund the repair reserve in advance
- Derive the maximum price from the math
- Offer on the calculation, not the listing
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