What Is the Mortgage Stress Test?
The mortgage stress test is a federal rule that requires most mortgage borrowers in Canada to qualify at a higher interest rate than the one they actually pay. The goal is to confirm you could still make your mortgage payments if interest rates were to rise. It applies to both insured and uninsured mortgages from federally regulated financial institutions, as required by OSFI's Guideline B-20.
The stress test was introduced for insured mortgages in October 2016 and expanded to uninsured mortgages in January 2018. Since then, it has become a standard part of the mortgage approval process, affecting how much you can borrow and how much home you can afford.
- Protects you from taking on a mortgage you can't afford if rates rise.
- Applies to most new mortgages, and renewals with the same lender and qualifying straight switches are generally exempt.
- Calculated using the higher of the contract rate plus 2% or the minimum qualifying rate (MQR).
Sources: Bank of Canada, Ratehub.ca, Innovation Federal Credit Union
How the Stress Test Works for Insured vs Uninsured Mortgages
The stress test works similarly for both insured and uninsured mortgages, but the qualifying criteria differ.
These limits determine what portion of your income can go toward housing costs and all your debts. Lenders use these ratios, combined with the stress-test rate, to calculate the maximum mortgage amount you can qualify for.
- Insured (high-ratio): GDS up to 39%, TDS up to 44%.
- Uninsured (low-ratio): GDS up to 35%, TDS up to 42%.
- For insured mortgages, you must also meet CMHC requirements for mortgage insurance.
Sources: Bank of Canada, nesto.ca, Forbes Advisor, WOWA.ca
Current Qualifying Rate and How It's Determined
The stress-test rate is the higher of your contract mortgage rate plus 2% or the minimum qualifying rate (MQR) set by the Office of the Superintendent of Financial Institutions (OSFI). As of June 1, 2021, the MQR floor has been 5.25% for both insured and uninsured mortgages, harmonizing the qualifying rule.
Interest rates in Canada have been volatile. The Bank of Canada hiked its overnight lending rate from 0.25% to 5% between March 2022 and July 2023, causing many borrowers to face higher contract rates. The MQR floor remains 5.25%, but OSFI reviews it each December, so it may change. If your contract rate is, say, 4%, your stress-test rate would be 6% (4% + 2%). If your contract rate is 3%, the stress-test rate would be 5.25%, because that's the minimum.
- Stress-test rate = higher of (contract rate + 2%) or MQR.
- MQR has been 5.25% since June 1, 2021.
- OSFI reviews the MQR each December; it could change.
Sources: nesto.ca, WOWA.ca, Ratehub.ca, Innovation Federal Credit Union, TD Bank
Step-by-Step Example: Calculating Maximum Mortgage with the Stress Test
To see how the stress test affects your borrowing capacity, consider a simplified example.
First, find the stress-test rate. Next, calculate the monthly mortgage payment using the stress-test rate.
This example illustrates how the stress test can reduce the maximum mortgage you can qualify for. In practice, the stress test can reduce your purchasing power by tens of thousands of dollars compared to qualifying at your actual contract rate.
- The stress test directly reduces the maximum mortgage amount you can qualify for.
Sources: Ratehub.ca, Innovation Federal Credit Union
How to Prepare for the Stress Test as a Homebuyer
If you're planning to buy a home, you can take steps to improve your chances of passing the stress test and maximize your borrowing capacity. Start by calculating your debt ratios and seeing how they change with different down payments and mortgage amounts. Keep your other debts low, since TDS includes all debt payments. A larger down payment can reduce your mortgage amount and may move you from insured to uninsured, but note the stricter GDS/TDS limits for uninsured mortgages.
You can also work with a mortgage professional to explore different lenders and products, as qualifying criteria can vary. Just remember that the stress test is a floor—lenders may have their own underwriting rules on top of it.
- Calculate your GDS and TDS ratios before house hunting.
- Pay down credit card and other debts to lower TDS.
- Consider a larger down payment, but account for uninsured mortgage limits.
- Compare offers from multiple lenders to find one that fits your situation.
Sources: Ratehub.ca, Innovation Federal Credit Union
Frequently asked questions
Do I need to take the mortgage stress test if I have a large down payment?
For uninsured mortgages, the GDS limit is 35% and TDS is 42%, and you still need to qualify at the stress-test rate.
Sources: nesto.ca, Forbes AdvisorHow often does the Bank of Canada change the qualifying rate?
The minimum qualifying rate is set by OSFI, not the Bank of Canada, and it's reviewed each December. As of June 1, 2021, the floor has been 5.25%, but it can change after OSFI's annual review. The Bank of Canada's policy rate changes don't directly set the stress-test rate, but they influence contract mortgage rates, which affect the 'contract rate + 2%' component.
Sources: WOWA.ca, Ratehub.caCan I switch lenders after passing the stress test?
Yes, but until recently, switching lenders required you to re-pass the stress test. As of November 21, 2024, straight switches between federally regulated lenders, without increasing the loan amount or amortization, are exempt from the stress test. This means you can transfer your mortgage to a new lender at renewal without re-qualifying, as long as you don't add funds or lengthen your amortization.
Sources: nesto.ca, WOWA.caDoes the stress test apply to mortgage renewals?
No, mortgage renewals with the same lender, without increasing the loan amount or extending the amortization, are exempt from the stress test. Similarly, straight switches to a different lender are also exempt as of November 21, 2024, as long as the loan amount and amortization don't increase.
Sources: nesto.ca, WOWA.ca, Innovation Federal Credit UnionWhat happens if my income changes after I pass the stress test?
Once you've been approved and closed on your mortgage, the stress test only applies at the time of application. If your income later decreases, your existing mortgage continues as before; you're not required to re-qualify. However, if you apply to increase your mortgage amount or refinance, you'll need to re-pass the stress test based on your current income and rates.
Sources: nesto.ca, Innovation Federal Credit UnionSources
- Mortgage stress tests and household financial resilience under monetary policy tightening — Bank of Canada
- Mortgage Stress Test Calculator Canada — nesto.ca
- Canada's Mortgage Stress Test: How It Works — Forbes Advisor
- Mortgage Stress-Test Calculator | 2026 Updates - WOWA.ca — WOWA.ca
- Mortgage Stress Test: Everything you need to know | Ratehub.ca — Ratehub.ca
- What is a Mortgage Stress Test? — Innovation Federal Credit Union
- Updates to Canada's Mortgage Stress Test - TD Stories — TD Bank