How the mortgage stress test works in Canada

Canada's mortgage stress test requires you to qualify at whichever is higher: 5.25% or your contract rate plus 2 percentage points. The rule applies to insured and uninsured mortgages, set by OSFI for federally regulated lenders. Straight switches at renewal skip a new test.

Every federally regulated lender in Canada has to qualify you at a rate higher than the one you will actually pay. That rate, called the minimum qualifying rate, decides how much house you can afford on paper even when your real payment is lower. Here is exactly how it works and where the numbers come from.

What rate do you actually need to qualify at?

Whichever is higher: 5.25%, or the rate you negotiate with your lender plus 2 percentage points. OSFI sets this floor and buffer for uninsured mortgages, and the Financial Consumer Agency of Canada confirms the same formula applies to insured mortgages too.

So if you negotiate a 4.49% five year fixed rate, your lender qualifies you as if you were paying 6.49%, since 4.49 plus 2 beats the 5.25% floor. If you negotiate a 3% variable rate, you get qualified at 5.25%, since 3 plus 2 only reaches 5%. The floor stops mattering once your contract rate climbs past about 3.25%, and from there the qualifying rate tracks your actual rate plus 2 points.

This is the rate your lender plugs into your debt service ratios, not the rate on your amortization schedule. Two buyers with identical income and the same real interest rate can qualify for different mortgage amounts if they negotiate different contract rates, because the stress test rate moves with the contract rate once it clears the floor.

Why does this rule exist at all?

To find out whether you could handle a higher payment later, whether from a rate increase or a drop in your income, before a lender approves the loan. OSFI's own explanation is that lenders are expected to test a borrower's ability to repay at a higher rate than the one on the contract, so a payment shock later does not turn into a default. The requirement sits inside OSFI's broader underwriting standard for federally regulated lenders, Guideline B-20.

Does the stress test apply to insured mortgages too?

Yes. The rule is not softer just because you are putting less money down. The Financial Consumer Agency of Canada states plainly that the same qualifying rate, the higher of 5.25% or your contract rate plus 2 percentage points, applies to insured and uninsured mortgages alike. An insured mortgage is one where your down payment is under 20% and you pay for mortgage default insurance through CMHC or a private insurer. Whether you put down 5% or 35%, the test itself does not change.

Who sets this rule, and who actually has to follow it?

The Office of the Superintendent of Financial Institutions, OSFI, sets and oversees the minimum qualifying rate for federally regulated lenders, which covers the major banks and most large mortgage lenders in Canada.

Credit unions are provincially regulated and are not bound by OSFI's rule directly, though many apply a comparable test on their own. Private lenders operate outside the federally regulated system and generally skip the stress test altogether, charging a higher rate instead of testing your income against one.

Can I avoid a new stress test when I renew?

In one specific case, yes. Since November 21, 2024, OSFI has not required a lender to apply the minimum qualifying rate on a straight switch at renewal, meaning you move an uninsured mortgage to a different federally regulated lender at the same loan amount without extending your amortization. If that describes your renewal, you do not need to clear 5.25% or your new contract rate plus 2 again just to change who holds the mortgage.

Staying with your existing lender at renewal has never triggered a fresh stress test either. Increasing your loan amount does, whether that happens through a refinance or through switching lenders for a bigger mortgage.

What else changed with insured mortgages recently?

Two changes took effect on December 15, 2024, and neither one touches the qualifying rate formula itself, but both affect how large a mortgage you can carry under it. The insured mortgage price cap rose from $1,000,000 to $1,500,000, so a home priced up to $1.5 million can now carry mortgage default insurance with a down payment under 20%, where the ceiling used to sit at $1 million. And 30 year amortizations became available to all first time buyers and all buyers of a new build using an insured mortgage, up from the previous 25 year maximum on an insured loan.

What does this mean for how much you can borrow?

The two levers you actually control are your contract rate and your amortization, and both feed the same stress test payment. A lower negotiated rate keeps you closer to the 5.25% floor instead of pushing the qualifying rate up with it, and a longer amortization spreads the stressed payment over more months, which lowers it relative to your income.

To see it in numbers: on a $700,000 mortgage at a 25 year amortization, a payment stress tested at 6.49% runs meaningfully higher each month than the same loan stress tested at 5.25%, and stretching that same loan to 30 years lowers the stressed payment further without changing the rate at all. Those are illustrations of the mechanics, not a quote, since your own rate, amortization and lender will move the real number. Our affordability calculator runs the same higher of 5.25% or contract plus 2 rule against your own numbers to show what you can actually qualify for in the GTA today.