Housing
How Much Mortgage Can You Afford in Ontario? (2026 Guide)
· 6 min read · Rules and rates verified September 2026
“How much house can I afford?” has two answers. The first comes from your lender, and it is calculated with rules, not feelings: two debt ratios and a stress test that decide the maximum mortgage you can be approved for. The second comes from your budget, and it is the one that decides whether you sleep well at night. This guide covers both — the official math that sets your ceiling, and the honest math that keeps you comfortable underneath it.
The two ratios that set your ceiling
Canadian lenders qualify you using two debt-service ratios. Both use your gross household income — before tax — and both must be satisfied:
- GDS (Gross Debt Service) ≤ 32%. Your total housing costs — mortgage principal and interest at the qualifying rate, property taxes, heating, and half of condo fees — cannot exceed 32% of gross income.
- TDS (Total Debt Service) ≤ 40%. Everything in GDS plus all other debt payments — car loans, student loans, credit card minimums, lines of credit — cannot exceed 40% of gross income.
Some lenders will stretch these to 35% and 42% for borrowers with excellent credit and strong down payments, but 32/40 is the standard screen. If you fail either ratio, the answer is a smaller mortgage, a larger down payment, or less outside debt — the lender will not bend the arithmetic.
The stress test: qualifying at a rate you will never pay
Federally regulated lenders must test your application at the higher of your contract rate plus 2%, or the 5.25% benchmark rate. If your actual mortgage rate is 4.79%, you qualify as if it were 6.79%. If your contract rate is 3.50%, you qualify at 5.50%.
The stress test is the single biggest constraint on borrowing power. Qualifying at 6.79% instead of 4.79% cuts roughly 15–20% off the mortgage you would get at your real rate. It exists so that you can still afford your home if rates rise at renewal — and it is why the number on your pre-approval often surprises people who did the math at today’s advertised rates.
Down payment minimums in 2026
Canada’s minimum down payment rules are tiered by purchase price:
| Purchase price | Minimum down payment |
|---|---|
| Up to $500,000 | 5% of the price |
| $500,000 to $1,500,000 | 5% of the first $500,000 + 10% of the remainder |
| Above $1,500,000 | 20% (mortgage insurance is not available) |
Put down less than 20% and you must buy mortgage default insurance from CMHC, Canada Guaranty, or Sagen. The premium — 2.80% to 4.00% of the mortgage depending on your loan-to-value ratio — is added to your loan, so you pay interest on it for the life of the mortgage. On a $600,000 purchase with 10% down, the premium adds roughly $17,000 to what you borrow. That is real debt, not a fee you can ignore in the affordability math.
A worked example. A household earning $150,000 with no outside debt, buying outside Toronto with a 25-year amortization:
GDS budget: 32% × $150,000 ÷ 12 = $4,000/month for all housing costs.
Property tax (~$400/month) + heat (~$150/month) leaves $3,450/month for the mortgage payment itself.
At a 7.00% qualifying rate, $3,450/month supports a mortgage of about $490,000.
With 20% down, that is a home of roughly $610,000. With 10% down, the insurance premium eats into the budget, pulling the affordable price down to roughly $560,000–$575,000.
What the ratios do not see
The 32/40 rules are built on gross income, and gross income is not money you can spend. On $150,000 of household income in Ontario, take-home pay is roughly $9,500 a month after tax — so a $4,000 housing budget is over 40% of your actual cash, before groceries, childcare, commuting, and everything else. The ratios also ignore how stable your income is: two salaried earners at $75,000 each are treated the same as one commission-based earner at $150,000, but they do not feel the same.
The practical move: run your own budget at your contract rate — the rate you will actually pay — with your real monthly expenses. If the maximum mortgage leaves you with no room for savings, maintenance (budget about 1% of the home’s value per year), or a rate increase at renewal, the maximum is not your number. Your number is lower.
Ontario costs beyond the mortgage
Your lender qualifies you on the mortgage, but your wallet pays for more than the mortgage. In Ontario, land transfer tax is charged on marginal brackets, and buyers in the City of Toronto pay a second municipal land transfer tax on top — nearly doubling the bill. First-time buyers get rebates of up to $4,000 provincially (plus up to $4,475 in Toronto), but everyone else pays in full. On top of that, budget 1.5% to 4% of the purchase price for closing costs: legal fees, title insurance, and adjustments for prepaid property tax and utilities.
These costs do not change your GDS ratio, but they change how much cash you need on closing day — and cash is often the binding constraint for Ontario buyers, not income.