Before you start touring homes in the GTA, the first number that matters isn't the list price — it's how much a lender will actually let you borrow, and how much of that payment you can comfortably carry alongside everything else you own. Affordability in Canada comes down to a small set of federally regulated rules, not guesswork, so you can work it out with real precision before you ever contact an agent.
The two ratios lenders actually use
Canadian lenders qualify you using two debt-service ratios, both expressed as a percentage of your gross (pre-tax) household income.
- GDS (Gross Debt Service) — your mortgage payment, property tax, heating costs, and 50% of any condo fees, divided by gross income. Most lenders cap this at 39%.
- TDS (Total Debt Service) — the same costs plus all other debt payments (car loans, credit cards, student loans, lines of credit), capped at 44%.
Both ratios have to pass. A buyer with no other debt is usually limited by GDS; a buyer carrying a car loan or high credit card balances often hits the TDS ceiling first, which is why paying down revolving debt before applying can raise your approved amount more than a larger down payment does.
The mortgage stress test
Since 2018, every insured and uninsured mortgage in Canada has to be qualified at a "stress test" rate — the higher of your contract rate plus 2%, or the Bank of Canada's minimum qualifying rate. You don't pay this rate; it's simply the number lenders use to confirm you could still afford payments if rates rose. In practice, it lowers most buyers' approved amount by roughly 15-20% compared to qualifying at their actual contract rate, so the mortgage you're pre-approved for is intentionally more conservative than what your take-home pay might suggest you can handle.
Minimum down payment rules
Down payment minimums in Canada are set on a sliding scale by purchase price:
- 5% on the portion of the price up to $500,000
- 10% on the portion between $500,000 and $999,999
- 20% minimum on any home priced at $1,000,000 or more (no CMHC-insured mortgage is available above this threshold)
Anything below 20% down requires mortgage default insurance (CMHC, Sagen, or Canada Guaranty), which adds a one-time premium — typically 2.8% to 4% of the loan amount — either paid upfront or rolled into the mortgage. That premium is a real cost of a smaller down payment, not just a formality, and it's worth running both scenarios before deciding how much to put down.
Land transfer tax — and Toronto's second tax
Every property purchase in Ontario triggers provincial land transfer tax, calculated on a marginal bracket system based on purchase price. If you're buying within the City of Toronto specifically, you pay a second, municipal land transfer tax on top of the provincial one — roughly doubling your closing land transfer cost compared to buying just outside the city limits in Mississauga, Vaughan, or Markham. This is one of the more overlooked GTA-specific line items in a closing cost estimate.
First-time buyers get meaningful relief from both: a rebate of up to $4,000 on the provincial tax and up to $4,475 on Toronto's municipal tax, which together can eliminate land transfer tax entirely on a typical first home purchase. You have to apply for the rebate — it isn't automatic — so confirm your lawyer is filing for it if you qualify.
Putting it together: a simple way to estimate your range
A quick sanity check before a full pre-approval: take your gross monthly household income, multiply by 39% for a rough maximum housing payment (mortgage + tax + heat), then work backward using current mortgage rates to estimate the loan size that payment supports. Add your down payment to get an approximate maximum purchase price, then subtract land transfer tax and closing costs (typically 1.5-4% of the price) to see what you'll actually need in liquid savings on closing day — not just for the down payment.
Our mortgage calculator runs this math directly against current rates so you don't have to do it by hand, and it's a faster way to get a realistic range before you start touring homes.
Frequently asked questions
Does a pre-approval guarantee my mortgage amount?
No. A pre-approval is based on a snapshot of your income, debts, and credit at the time you apply, usually valid for 90-120 days. The lender still verifies everything and appraises the specific property before final approval, so a pre-approval is a strong planning tool, not a guarantee.
Do condo maintenance fees count against my affordability?
Yes — lenders count 50% of your monthly condo fee as a debt-service cost in both the GDS and TDS calculations, which is why two identically priced homes (a condo with fees versus a freehold with none) can qualify for meaningfully different mortgage amounts for the same buyer.
Can I use gifted down payment funds?
Most lenders accept a down payment gifted from an immediate family member, provided it's documented with a signed gift letter confirming it doesn't need to be repaid. Insured mortgages under 20% down have specific rules about how much of the down payment can be gifted versus from your own savings — confirm the current requirement with your lender.
Is the stress test rate the rate I'll actually pay?
No. The stress test rate is only used to qualify you; your actual mortgage payments are calculated at your real contract rate, which is typically lower. It exists purely to confirm you could absorb a rate increase without becoming unable to make payments.
Ready to see what's actually available in your range? Browse current GTA listings filtered by price, or start a conversation with our AI search assistant to narrow things down by neighbourhood and budget together.