Lenders do not agree on what a dollar of rent is worth. At most big banks half the rent is added to your income and the whole rental payment counts against you. At some monolines and credit unions the rent is subtracted from the rental payment first, so only the shortfall counts. On the same purchase those two methods can be the difference between a decline and an approval with room to spare. This calculator runs your numbers through both, using the current stress-test rate from my lender sheet, and tells you which rulebook you need.
Rental income mortgage calculator (BC)
Enter the purchase and your household numbers. The calculator qualifies the same file under the two rulebooks lenders use for rental income and shows which one approves you.
A worked example: the same condo, approved and declined
A Kelowna household earns $140,000, pays $2,600 a month on its own home and buys a $500,000 condo to rent at $2,400 with 20% down. Strata is $350, property tax $200, heat $100. The rental mortgage of $400,000 is stress-tested at 6.24%. Under the add-back rulebook the file lands at 44.2% total debt service, just over the 44% line, and that lender says no. Under the offset rulebook the same file sits at 28.2% and is approved with room for a second property. The buyer did not change. The rulebook did.
One more honest number from that example: at the contract rate over 25 years the condo runs about $450 a month negative after strata, tax and heat. Kelowna condos bought with 20% down at today’s rates usually do. The case for buying is equity paydown and appreciation, and the qualification math above is about whether a lender lets you make that bet, not whether it is a good one. Run the full picture on the investment property mortgages in Kelowna page.
How lenders count rental income in BC
| Method | What happens to the rent | Who uses it | Best for |
|---|---|---|---|
| Add-back (50%) | Half the rent is added to your income; the full rental payment is a debt | Most big banks | High-income buyers with little other debt |
| Add-back (80%) | Same idea with a larger share of rent | A few banks and credit unions | Marginal files that just miss at 50% |
| Offset (up to 100%) | Rent is subtracted from the rental payment; only the shortfall is a debt, and a surplus can add to income | Several monolines and credit unions | Investors building a portfolio, suite-income buyers |
| Two-year average | Existing rentals are read from your T1 and T776 net rental income, not a lease | Common everywhere for properties you already own | Landlords with clean tax returns |
The lender’s choice of method is the single biggest lever in an investor file, and it is not something a bank branch can change for you. A broker picks the lender to match the file. That is the whole job on a rental purchase.
Frequently asked questions
How much rental income do lenders count in Canada?
It depends on the lender, not on you. The common methods are a 50% add-back to income (most big banks), an 80% add-back (some lenders), and an offset of 50% to 100% against the rental payment (several monolines and credit unions). For a property you already own, most lenders use the two-year average from your tax returns instead.
What debt service ratio do I need for a rental property?
Most lenders cap total debt service at 44% of gross income for insured and conventional files, with some using 42% or a 39% gross debt service cap as well. The calculator uses 44%. The rulebook matters more than the cap: the same file can be 44% under add-back and 28% under offset.
Do I qualify at the stress-test rate on a rental?
Yes. Rental purchases are conventional mortgages, so you qualify at the higher of your contract rate plus 2% or 5.25%, on the full rental mortgage, alongside your own housing costs. Since November 21, 2024 that stress test is waived only for straight renewal switches, not for purchases or refinances.
Can I use projected rent on a property I have not bought yet?
Yes. Lenders accept a signed lease if there is one, or a market rent letter from an appraiser or a comparable-rent analysis, and then apply their add-back or offset method to that figure. Short-term rental income is treated differently; see the short-term rental guide in the series below.
Keep reading: the investor series
- Down payment for a rental property in BC: 20% for a pure rental, 5% if you live in one unit
- OSFI’s 2026 rental mortgage rules: the 50% test that decides how your bank treats a rental file
- Financing a secondary suite in BC: refinance, HELOC or the federal suite loan, with the math
- Landlord renewals: refinancing to buy the next door: how equity in rental one funds rental two
Run the deal past us before you offer
If the add-back rulebook says no, that is not the end of the file; it is a lender-selection problem. Send the listing, the rent you expect and your income picture, and I will show you which lenders qualify it and at what rate, in writing, before you write an offer. Call 250-859-2100 or book a free 30-minute review. No credit pull until you say go, and on standard residential mortgages the lender pays the fee.