Mortgage Stress Test Canada 2025

How the Canadian stress test works, what qualifying rate applies, and strategies to qualify for more.

What Is the Mortgage Stress Test?

Canada's mortgage stress test — officially OSFI's B-20 guideline — requires all federally regulated lenders to qualify borrowers at a rate higher than the actual mortgage rate they will pay. The purpose is to ensure Canadians can still afford their mortgage if rates rise significantly after they buy.

The qualifying rate is the greater of two thresholds:

• Your contract rate plus 2.00%
• 5.25% (the minimum qualifying rate floor)

In practice, because most mortgage rates in 2025 are well above 3.25%, the "contract rate + 2%" rule is the one that applies for virtually all borrowers today. If you secure a 5-year fixed at 4.74%, you must demonstrate you can afford payments at 6.74%.

How Much Does the Stress Test Reduce Buying Power?

The stress test reduces qualifying mortgage amounts by approximately 15–20%. Here is a practical example:

Household Income	Qualifying Without Stress Test	Qualifying With Stress Test	Difference
$80,000	~$400,000	~$340,000	-$60,000
$120,000	~$600,000	~$510,000	-$90,000
$160,000	~$800,000	~$680,000	-$120,000
$200,000	~$1,000,000	~$850,000	-$150,000

Note: These are approximate figures based on standard GDS/TDS ratios with average property taxes and no other debt. Your actual qualifying amount will vary.

GDS and TDS Ratios Explained

The stress test works through two debt ratios that lenders use to determine your maximum mortgage:

• Gross Debt Service (GDS): Monthly housing costs (mortgage + property tax + heat + 50% of condo fees) divided by gross monthly income. Maximum is 39% for most insured mortgages.
• Total Debt Service (TDS): GDS costs plus all other debt obligations (car payments, credit card minimums, student loans) divided by gross monthly income. Maximum is 44%.

These ratios are calculated using the stress test qualifying rate, not your actual contract rate. So your payments appear larger than they actually will be — which is exactly the point of the test.

Who Is Exempt from the Stress Test?

The stress test applies to all federally regulated financial institutions in Canada. However, some lenders are not federally regulated:

• Credit unions: Provincially regulated, not subject to B-20. May have their own qualifying standards, but generally more lenient.
• Private lenders: Not regulated by OSFI. Can lend based on equity and property value rather than income ratios. Higher rates apply.
• Mortgage Investment Corporations (MICs): Similar to private lenders, they are not subject to the federal stress test.

Importantly, when you renew your mortgage with your existing lender at the end of your term (without increasing the amount), the stress test does not apply. But if you switch to a new lender at renewal, it does.

Stress Test Changes: History and Future

The mortgage stress test was introduced in its current form in January 2018 for all borrowers (insured and uninsured). Before that, the stress test only applied to insured mortgages (those with less than 20% down). OSFI reviews the minimum qualifying rate floor (currently 5.25%) periodically. During peak rate environments, many argued the 5.25% floor was redundant since contract rates + 2% were already well above it. Future changes to the floor are possible as the Bank of Canada continues cutting rates.

Strategies to Qualify for More Under the Stress Test

• Increase your down payment: A larger down payment reduces the required mortgage amount and improves your ratios
• Pay down existing debts: Eliminating car payments or credit card balances before applying can significantly improve your TDS ratio
• Add a co-borrower: A second income on the application increases qualifying power — even if the co-borrower won't live in the home
• Choose a 30-year amortization: Longer amortization means lower payments, which improves your ratios (at the cost of paying more interest over time)
• Use a credit union: If the math doesn't work at a federally regulated lender, a credit union may qualify you under their own standards
• Use rental income: If the property has a suite or rental unit, lenders may add 50–80% of rental income to your qualifying income

Stress Test at Renewal: The Good News

As of June 2022, OSFI clarified that uninsured mortgage borrowers renewing at their existing lender are not subject to re-stress testing, even if they switch products. This means millions of Canadians renewing in 2025–2026 can stay with their lender without re-qualifying at today's higher stress test rates — an important protection given that many households have taken on additional debt since their original mortgage.