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Key Takeaways
- Lenders cap most borrowers at GDS 39% and TDS 44% — the lower number wins.
- Affordability is calculated at the stress-tested qualifying rate, not the contract rate you'd actually pay.
- A $150K dual income with no other debt supports roughly a $570K purchase at 20% down — but $700/mo in other debt cuts that by ~$130K.
- Credit score, down payment source, employment history, and property type all adjust the maximum.
- A pre-approval converts these ratios into a real, lender-backed number in about 30 minutes.
The honest answer to 'how much mortgage can I afford' isn't a number from an online calculator — it's a number a lender will actually fund. Here's how Canadian lenders work it out in 2026, and how to estimate your own ceiling before you ever submit an application.
The Two Ratios That Decide Everything
Canadian lenders use two debt-service ratios:
The lower of the two ceilings determines your maximum. For buyers carrying significant other debt, TDS is almost always what binds.
A Realistic 2026 Example
A dual-income household earning $150,000 gross per year — about $12,500/month gross — with no other debt, $20,000 in property tax + heat estimates per year, and a 20% down payment:
The same household with $700/month in car and credit payments loses about $130,000 of that purchasing power — TDS catches up fast.
The Stress Test Sits on Top of This
The ratios above are calculated using the stress-tested qualifying rate (contract rate + 2%, or 5.25%, whichever is higher) — not the rate you'll actually pay. That's why pre-approval amounts often feel lower than what calculators on real-estate listing sites suggest. See [our stress test guide](/blog/mortgage-stress-test-canada-2026) for the math.
Beyond the Ratios: What Else a Lender Looks At
Calculate Your Own Estimate
The fastest way to ballpark your number:
1. Multiply your gross monthly income by 0.39 → that's your monthly housing-cost ceiling. 2. Subtract estimated property tax and heat (~$400–$700/month in most Canadian markets). 3. Subtract every other monthly debt payment. 4. The remainder is what's available for a mortgage payment at the stress-tested rate.
Our [mortgage payment calculator](/calculators/mortgage-payment) handles the rate-to-payment side once you have that number.
Get the Real Number
The ratios above are how lenders think — but each lender weights employment type, credit history, and property risk slightly differently. A 30-minute pre-approval conversation will replace every estimate above with the actual maximum from a network of lenders, with no obligation to proceed.
The information provided on this page is for educational purposes. Ratios and lender guidelines change. Contact a licensed mortgage professional for current conditions.
Have questions about how much mortgage can i afford? (canada, 2026)?
Call for a free, no-obligation consultation, or run the numbers first with the mortgage calculators.
(604) 780-5173About the author
Kyle Benzies, Licensed Mortgage Broker
I'm a licensed mortgage broker serving clients across British Columbia, Alberta, and Ontario. I work with a network of over 100 lenders — banks, credit unions, monoline, and alternative lenders — to find financing that fits each client's situation rather than a single institution's product shelf. Everything I publish here is written to explain how Canadian mortgage lending actually works, in plain language.
Published June 18, 2026
