Why we will not publish a number
A required income depends on your down payment, your other debts, the property tax on that specific house, whether it has condo fees, the heating cost, your credit, your amortisation, and the rate you are actually offered on the day. Change any one of those and the answer moves by tens of thousands of dollars.
A headline figure would be wrong for almost everyone reading it. What is stable, and genuinely useful, is the method — and the method is published by the regulators, so you can run it yourself before you speak to anybody.
Step one: the two ratios
Lenders measure your income against two debt-service ratios. For an insured mortgage, CMHC's stated maximums are:
- Gross Debt Service (GDS): 39% — your housing costs as a share of gross income.
- Total Debt Service (TDS): 44% — housing costs plus all your other debt payments.
What goes into the housing side of GDS is the part people get wrong. It is not just the mortgage payment. It is principal and interest, property tax, heat, and — for a condo — 50% of the condo fee. CMHC also requires a minimum credit score of 600 for at least one borrower on an insured mortgage.
TDS then adds car payments, lines of credit, student loans, credit card minimums and support obligations. A $600 truck payment does not reduce your budget by $600; it reduces it by whatever purchase price that $600 of monthly capacity would have carried.
Step two: the stress test
You do not qualify at your actual rate. Under OSFI's minimum qualifying rate, you qualify at the greater of your contract rate plus two percentage points, or 5.25%. Those ratios above are measured against a payment calculated at that higher rate, not the one you will pay.
One exception is worth knowing at renewal: a straight switch between federally regulated lenders — same amortisation, same balance, no new money — is exempt from re-testing. That matters more to a homeowner than a first-time buyer, but it is the single most commonly misunderstood piece of the rule.
Step three: the down payment decides the ceiling
Canada's minimum down payment is tiered: 5% on the portion of the price up to $500,000, 10% on the portion between $500,000 and $1.5 million, and 20% at $1.5 million and above. Mortgage default insurance is available up to a $1,500,000 purchase price.
Since 15 December 2024, 30-year amortisation on insured mortgages has been available to first-time buyers and to buyers of newly built homes. A longer amortisation lowers the qualifying payment, which raises the price the same income supports — and raises the total interest paid over the life of the loan. It is a trade, not a free upgrade.
More detail: down payment rules, the FHSA and the RRSP Home Buyers' Plan.
What Alberta changes
Two Alberta facts shift the arithmetic in your favour, and buyers moving here from Ontario or British Columbia routinely underestimate both.
- No land transfer tax. Alberta charges Land Titles registration fees instead: $50 plus $5 per $5,000 of value, levied on the transfer and again on the mortgage. On the same purchase, the equivalent tax in several other provinces runs into five figures. The full explanation.
- No provincial sales tax on the default-insurance premium. PST applies to mortgage default insurance premiums in Ontario, Quebec and Saskatchewan only. In Alberta the premium is added to the mortgage; there is no provincial tax layered on top of it. Alberta has no provincial sales tax at all, though it does have provincial income tax.
Working the other way: Calgary property taxes and Calgary heating costs both go into GDS, and both are real numbers on a specific house. So does 50% of a condo fee — which is why two condos at the same price can qualify differently, and why a high-fee building costs you buying power as well as cash flow.
The single most common surprise we see: a buyer pre-approved on a detached budget discovers the same income buys noticeably less in a condo, purely because half the condo fee counts against them.
The Calgary line items people forget
- Lake and HOA fees. Several Calgary communities carry a mandatory annual homeowners' association fee funding lake or amenity access. It is not a condo fee, it does not go away, and it is a real carrying cost. Which communities charge them.
- Suite income. Lenders treat rental income from a basement suite differently by lender and by whether the suite is legal. Do not build a budget on income a lender has not agreed to use. Renting part of your home.
- Closing costs. Legal fees, title insurance, inspection, adjustments and the Land Titles fees above all come out of cash, not the mortgage. What to budget.
What to actually do
Run the arithmetic yourself for a shape of the answer, then get a real one. Our calculators will show you payment and affordability scenarios, and how much house can I afford in Calgary walks through the same logic from the price side.
Then speak to a mortgage broker before you look at houses, not after you have found one. We are REALTORS®, not lenders — we cannot tell you what you qualify for and we will not guess. A broker can pull your credit properly, read your documents, and give you a number that a lender will actually honour. Ours are here: Calgary mortgage broker, and what a pre-approval really is.