The Mortgage Stress Test Explained (Minimum Qualifying Rate)
Who can skip the prescribed rate at renewal is the 2026 renewal guide. How the contract rate itself is chosen is the fixed versus variable framework. Both pages hang off the Canadian mortgage guide. First-time buyers meet the test again inside CMHC's premiums and the 30-year Home Start option, covered in the first-time buyer guide.
- Buffer: 2 percentage points over the contract rate. Floor: 5.25%. You qualify at whichever is higher. OSFI reviews the calibration at least annually. Its public page still showed these settings in September 2026.
- You pay the contract rate. The qualifying rate is a test, not a price.
- For the loans it insures, CMHC caps gross debt service at 39% and total debt service at 44%, both calculated at the qualifying rate. At least one borrower needs a credit score of 600, with room for alternative credit histories.
- Uninsured straight switches at renewal are the main exception to the prescribed rate, and the exception is narrow. See the renewal guide.
- On an illustrative $500,000 loan at a 4.50% contract rate, the qualifying rate is 6.50% and the qualifying payment is about $582 a month higher than the payment you would actually make.
How do you calculate the qualifying rate?
| Contract rate | Contract plus 2 points | Floor | Qualifying rate |
|---|---|---|---|
| 3.00% (illustration) | 5.00% | 5.25% | 5.25%. The floor wins. |
| 3.25% | 5.25% | 5.25% | 5.25%. The two tests tie. |
| 4.50% (illustration) | 6.50% | 5.25% | 6.50%. The buffer wins. |
| 6.09% posted 5-year, September 23, 2026 | 8.09% | 5.25% | 8.09%, if someone actually contracted at the posted rate. Most people contract at a discount, and the test uses the discounted contract rate. |
Table as of September 2026. The 3.00% and 4.50% rows are arithmetic, not offers. The 6.09% row is the Bank of Canada chartered-bank posted 5-year conventional rate on September 23, 2026. Rule source: OSFI's minimum qualifying rate page, and CMHC Purchase, which requires debt-service ratios at the greater of the contract rate plus 2% or 5.25%.
What does the test do to a $500,000 loan?
Assume a contract rate of 4.50%. The qualifying rate is 6.50%. The contract payment is $2,767 a month. The qualifying payment is $3,349 a month. The $582 gap is the test. Add an illustration of housing costs around that qualifying payment: $3,349 times 12 is $40,188, plus $4,000 of property tax and $1,200 of heat, which is $45,388 a year. CMHC's 39% gross debt-service cap would require about $116,400 of gross income to carry those housing costs alone ($45,388 divided by 0.39). A $500 monthly car payment adds $6,000 a year. Total debt service of $51,388 divided by CMHC's 44% cap is about $116,800 of income. In this sketch the car barely changes the income test. A larger non-housing payment would. Uninsured lenders set their own ratio caps under Guideline B-20. The 39% and 44% figures are CMHC's insured maxima, not a universal uninsured rule.
The monthly rate in the payment is (1 + annual rate / 2) to the power of 1/6, minus 1. Property tax and heat in the sketch are round assumptions so the ratio is visible. Your lender will use the tax bill and its own heating convention.
Who has to pass it, and who does not?
- New uninsured mortgages at federally regulated lenders. OSFI expects the minimum qualifying rate under Guideline B-20.
- Insured mortgages. The Department of Finance aligned the insured qualifying rate with the same greater-of formula in 2021. CMHC's current Purchase and Home Start pages still calculate gross and total debt service at that rate. The Canada Gazette consolidation of the insurable-loan rules records the same formula.
- Refinances that increase the amount or the amortization. The renewal guide explains why these are outside the straight-switch exemption.
- Uninsured straight switches from one federally regulated lender to another, with no increase in balance beyond $3,000 of costs and no increase in remaining amortization, on a stand-alone mortgage that is not a readvanceable combined plan. OSFI does not prescribe the qualifying rate. The lender still underwrites.
OSFI also applies loan-to-income limits to a lender's uninsured portfolio. Those limits are not a personal cap you can calculate from a webpage, and they do not replace the qualifying rate on a new origination. If a lender says the file does not fit its portfolio, that is a business limit on top of the stress test.
A lower contract rate makes the test easier, until the floor. Shopping the rate therefore changes how much house the same income can carry. It does not remove the test. The fixed versus variable page is about which contract you want after you know you qualify. Cash you might use to raise the down payment, and shrink the loan, includes the FHSA sequencing plan and the Home Buyers' Plan. The contribution ceilings on those accounts are the 2026 limits table. Cash you still need at the lawyer, including land transfer tax, is the closing cost guide.
Frequently asked questions
What is the mortgage stress test rate in 2026?
The greater of your contract rate plus 2 percentage points, or 5.25%. OSFI's page stated that calibration for uninsured mortgages in September 2026. CMHC uses the same rate for insured gross and total debt-service ratios. You pay the contract rate, not the qualifying rate.
When does the 5.25% floor matter?
When the contract rate is below 3.25%. At 3.25%, contract plus 2 equals the floor. Above that, the buffer is the test. A contract at 4.50% qualifies at 6.50%. The floor is still OSFI's backstop if contract rates fall, and the regulator reviews it at least annually.
Are gross debt service and total debt service the same for every lender?
CMHC's insured maxima are 39% gross and 44% total, calculated at the qualifying rate, with a minimum credit score of 600 for at least one borrower. Uninsured lenders follow Guideline B-20 and their own residential mortgage policy. They can be tighter than 39 and 44. Ask which ratios and which heating and tax figures the lender used.
Does the stress test apply when I renew with the same lender?
A plain renewal with the same lender, with no new money and no longer amortization, is not a new origination. The straight-switch exemption is about moving to a different federally regulated lender. If you add balance or years, expect a new qualifying-rate test. The renewal guide has the rows.
Does a bigger down payment avoid the stress test?
A down payment of 20% or more avoids high-ratio default insurance. It does not avoid the uninsured qualifying rate at a federally regulated lender. The test applies to most new uninsured mortgages. What changes is the loan size, the insurance premium, and whether the file is under OSFI's rule or an insurer's rule. Both currently use the same qualifying-rate formula.
Can two borrowers with the same income qualify for different amounts?
Yes. The qualifying rate depends on the contract rate each person is offered. Property tax, heat, condo fees, and other debts change the ratios. Credit score matters for insurance eligibility. One file can fail CMHC's 39% gross test and another can pass on the same salary because the property tax bill is different.
Sources
- OSFI: minimum qualifying rate for uninsured mortgages
- OSFI letter on straight switches and loan-to-income limits
- CMHC Purchase: debt-service ratios and premiums
- Canada Gazette: insurable housing loan regulations
- Bank of Canada 5-year conventional posted rate
Qualification is a lender's test. Deductibility is CRA's test.
Passing the stress test does not make mortgage interest deductible. The 2026 tax guide covers the return. The mortgage guide covers the loan.
Get the 2026 Tax Guide — $49 CAD
