Mortgage Stress Test
The mortgage stress test is a federal qualification rule requiring Canadian borrowers to prove they could afford their mortgage at the higher of their contract rate plus 2% or the minimum qualifying rate — not just at the rate they'll actually pay. It applies to insured and uninsured mortgages alike and typically reduces a buyer's maximum purchase price by roughly 15–20%.
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Key Takeaways
- You qualify at the higher of your contract rate + 2% or the minimum qualifying rate — not the rate you'll pay.
- Expect the test to cut your maximum purchase price by roughly 15–20% versus contract-rate math.
- Consumer debt is the silent killer: paying off a car loan can add more buying power than a larger down payment.
- Rules differ at credit unions and alternative lenders, and for renewals — where you apply can change what you qualify for.
How the Stress Test Works
When a federally regulated lender qualifies you for a mortgage, it doesn't use your actual contract rate. It uses the higher of:
Your contract rate + 2% — so a 4.5% mortgage is tested at 6.5%; or
The minimum qualifying rate (MQR) set by OSFI for uninsured mortgages (and the Department of Finance for insured ones).
Your income, debts, and the resulting GDS/TDS ratios are all evaluated against that higher test rate. You'll never pay the test rate — but you must qualify as if you would. The policy goal is a buffer: if rates rise by renewal time, borrowers can still carry the payment.
What It Does to Your Buying Power
The test rate reduces the maximum mortgage your income supports. As a rough illustration, a household with $160,000 of gross income, no other debts, and a 20% down payment might carry a mortgage in the low $900,000s at a 4.5% contract rate — but the same household tested at 6.5% qualifies for somewhere in the high $700,000s. The exact numbers move with rates and lender policy, but the haircut is consistently in the 15–20% range.
Three practical levers move your ceiling up:
Reduce consumer debt. A $600/month car payment can subtract roughly $80,000–$100,000 of mortgage capacity under TDS math.
Lengthen amortization. Uninsured borrowers (20%+ down) can often take 30-year amortizations, lowering the tested payment.
Add income. A co-borrower, documented bonus history, or qualifying rental income (including a legal basement suite's rent) all raise the qualifying base.
Who Is — and Isn't — Stress Tested
The test applies to essentially all new mortgages from federally regulated lenders: purchases, refinances, and transfers to a new lender. Since late 2023, straight renewals and lender switches of uninsured mortgages at the same amortization no longer require re-testing in many cases — a meaningful change for renewal shopping.
Some credit unions (provincially regulated) apply different internal tests, and some alternative or private lenders qualify on other criteria at higher rates. Buyers who 'fail' the bank stress test sometimes qualify elsewhere — at a price. For investors, most lenders apply the same framework but add rental offset or add-back rules, which vary widely between lenders and materially change what an investor qualifies for.
Frequently Asked Questions
Do I have to pass the stress test if I'm putting 20% or more down?+
Yes. The uninsured stress test (OSFI's B-20 guideline) applies regardless of down payment size at federally regulated lenders. A bigger down payment lowers the mortgage you need, which helps — but the qualification rate is the same.
Does the stress test apply to investment properties?+
Yes, at federally regulated lenders. The added wrinkle is how each lender treats rental income — some offset it against the property's costs, others add a percentage to your income — and those policies differ enough that the same investor can qualify at one lender and not another.
Can I avoid the stress test entirely?+
Some provincially regulated credit unions and most private lenders are not bound by the federal test, but they typically charge higher rates or fees that offset the flexibility. For most buyers the better path is improving the inputs: less consumer debt, longer amortization if uninsured, or additional qualifying income.
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