The mortgage stress test requires federally regulated lenders to qualify you at a higher interest rate than your actual mortgage rate, which reduces how much you can borrow. It applies to most new mortgages in Canada and is designed to ensure you can still afford payments if rates rise.
The mortgage stress test is a federal rule that requires federally regulated lenders to check whether you could still afford your mortgage payments if interest rates rise. Instead of qualifying you at your actual contract rate, the lender must use a higher qualifying rate. This reduces your borrowing capacity, because the higher rate produces a larger hypothetical payment that must fit within your debt-service ratios. The rule applies to most new mortgages in Canada, including insured and uninsured mortgages, though the exact qualifying rate differs.
| Mortgage type | Minimum qualifying rate | Who sets the rule |
|---|---|---|
| Insured (down payment under 20%) | Greater of contract rate + 2% or the Bank of Canada's 5-year conventional mortgage rate | Department of Finance |
| Uninsured (down payment 20% or more) | Greater of contract rate + 2% or 5.25% | OSFI B-20 guideline |
Sources: the Financial Consumer Agency of Canada and OSFI. The Bank of Canada publishes the 5-year conventional mortgage rate weekly; see Bank of Canada — interest rates.
Here is how the stress test affects a typical mortgage application:
- The lender determines your contract rate based on your creditworthiness, down payment, and the lender's own pricing.
- The lender calculates the minimum qualifying rate using the rules above.
- The lender recalculates your mortgage payment using the qualifying rate, not your contract rate.
- The lender applies its gross debt service (GDS) and total debt service (TDS) limits to that higher payment. For insured mortgages, the maximum GDS is typically 39% and TDS 44%; uninsured lenders may have different limits.
- If the higher payment pushes you over the limits, the lender reduces the mortgage amount you qualify for, or declines the application.
What the mortgage stress test is and why it exists
The stress test is not a fee or a rate you actually pay. It is a qualification test. Your actual mortgage payments are based on your contract rate. The stress test simply checks whether you could handle a rate increase. It was introduced to cool the housing market and protect borrowers from overextending themselves when rates rise. The Office of the Superintendent of Financial Institutions (OSFI) requires federally regulated lenders to apply a minimum qualifying rate (MQR) for uninsured mortgages under guideline B-20. For insured mortgages, the Department of Finance sets the stress test. The Financial Consumer Agency of Canada explains that lenders must ensure you can afford your mortgage at the higher rate.
Who must pass the stress test
The stress test applies to borrowers who get a new mortgage from a federally regulated lender, such as a bank, trust company, or loan company. It applies whether the mortgage is insured or uninsured. It also applies when you refinance an uninsured mortgage or switch to a new lender. Provincially regulated lenders, such as credit unions and caisses populaires, are not subject to OSFI's B-20 guideline, but many choose to apply a similar stress test. If you are renewing your mortgage with your current lender, you generally do not have to pass the stress test again. However, if you switch lenders at renewal, the new lender will usually apply the stress test. The stress test also applies to co-signers and guarantors, because their income and debts are included in the debt-service calculations. If you are considering what is a co-signer, remember that the stress test will assess the combined financial picture.
How the stress test affects your borrowing capacity
The stress test reduces the maximum mortgage amount you can qualify for. To see why, imagine you want a $500,000 mortgage at a contract rate of 5% over 25 years. Your actual monthly payment would be roughly $2,923. But if the stress test qualifying rate is 7%, the lender calculates your payment as if you were paying 7%, which is about $3,534. That higher payment must fit within your GDS and TDS limits. Because the hypothetical payment is larger, your maximum mortgage amount shrinks. The exact reduction depends on your income, debts, property taxes, heating costs, and the difference between your contract rate and the qualifying rate. In general, the lower your contract rate relative to the qualifying rate, the more the stress test reduces your purchasing power. You can use a loan payment calculator to estimate payments at different rates, but remember that the stress test uses the qualifying rate for qualification, not for your actual payments.
Insured vs uninsured mortgages: different rules
Insured mortgages are those with a down payment of less than 20% of the purchase price. They must be insured by CMHC, Sagen, or Canada Guaranty. For these mortgages, the stress test qualifying rate is the greater of your contract rate plus 2% and the Bank of Canada's 5-year conventional mortgage rate. The Bank of Canada updates this rate weekly. Uninsured mortgages have a down payment of 20% or more. For these, OSFI's B-20 guideline sets the minimum qualifying rate at the greater of your contract rate plus 2% and 5.25%. That 5.25% floor was introduced in 2021. The Canada Mortgage and Housing Corporation (CMHC) provides information on insured mortgages and down payment requirements. Note that the 5.25% floor is a regulatory threshold, not a market rate; it may change if OSFI updates the guideline.
When the stress test does not apply
The stress test does not apply to straightforward mortgage renewals where you stay with your existing lender and do not increase the mortgage amount or change the amortization. If you refinance to take out equity, the stress test applies to the refinanced amount. If you switch lenders, the new lender will apply the stress test. If you add a co-signer to help you qualify, the stress test still applies, but the co-signer's income can improve your debt-service ratios. For borrowers with bad credit, bad credit loans may be an alternative, but they often come with higher rates and fees.
Common mistakes borrowers make
- Assuming the stress test rate is the rate they will pay. It is only a qualification rate; actual payments are based on the contract rate.
- Forgetting that the stress test applies to co-signers and guarantors. Their debts and income are included.
- Thinking a larger down payment always avoids the stress test. Uninsured mortgages still face the stress test, just with a different floor.
- Ignoring property taxes and heating costs. These are part of GDS and TDS calculations and can push you over the limit.
- Not shopping around for a lower contract rate. A lower contract rate reduces the stress test qualifying rate, which can increase your borrowing capacity.
- Assuming credit unions follow the same rules. Provincially regulated lenders may have different stress test policies.