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Mortgage Stress Test: Everything You Need to Know

Alyssa Furtado

This piece was originally published on June 1, 2021, and was updated on June 20, 2022. 

We prepare for the worst every day: We carry umbrellas when it’s cloudy, pop Gravols before a long flight and buy travel insurance when going overseas. Why should taking on a mortgage be any different? A mortgage stress test is one way of preparing for the worst… it’s also a legal requirement in Canada.

What is a stress test?

In finance, planning for a worst-case scenario is called a stress test. It involves modelling a bad scenario before an investment is made. An example might involve starting a retirement fund with an RRSP: While an annual return of 5% might be a reasonable expectation, what if your investments only make 4% each year? Will you still have enough money to retire at 60? If not, that RRSP has failed the stress test. You can use this information to make better investments and avoid costly mistakes.

A mortgage stress test is a way of determining exactly how much you can afford (and under what circumstances). If your income was reduced or you lost your job, could you still afford to make mortgage payments? What if interest rates spike or you need to refinance your home?

This type of rainy-day planning is important for a few reasons. First, interest rates fluctuate. So do home prices. According to the Canadian Real Estate Association, Canada’s average home price was over $710,000 in May 2022, up 3.4% from a year before. Even more importantly, we are in a rising interest rate environment: 5-year fixed and 5-year variable mortgage rates have gone from lows of 1.39% and 0.85%, respectively, in 2021 to 4.09% and 2.50% in June 2022. Moreover, the Bank of Canada has clearly indicated that there will be multiple additional rate increases over the remaining course of 2022. Knowing you can still afford to pay your mortgage as interest rates rise is important, and should affect the kind of home you decide to buy.

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What is the Canadian mortgage stress test?

Since 2018, all Canadian homebuyers getting a high-ratio mortgage have been subject to a mortgage stress test – the test now applies to all mortgages. The mortgage stress test requires banks to check that a borrower can still make their payment at a rate that’s higher than they actually pay.

Here’s how it works. When you apply for a mortgage (including joint mortgages), you’ll be offered a contracted rate – hopefully, this will be as low as possible! However, your bank needs to check you’ll be able to pay back your mortgage, even if your mortgage rate rises during your mortgage term.

To do this, they check your ability to make your payments based on the Office of the Superintendent of Financial Institutions (OSFI) qualifying rate, which is based on the mode average of posted 5-year fixed rates from Canada’s big banks. The OSFI qualifying rate was 4.79%, but on June 1, 2021, the minimum qualifying rate increased to 5.25%.

This means that your income needs to be high enough, and your existing debt low enough, to be able to pay down your mortgage at that higher rate. Generally, this will result in you being able to borrow a smaller amount of money.

A mortgage stress test example

Let’s have a look at an example of the mortgage stress test. Let’s say the best mortgage rate in Canada is 1.78% and the OSFI qualifying rate is 5.25%. Even if you qualify for the lowest rates, you bank will run affordability calculations for two different mortgage rates:

  • 1.78% (your contracted rate), and
  • 5.25% (the OSFI qualifying rate).

According to our mortgage affordability calculator, a Toronto buyer with an annual income of $100,000, a 20% down payment, and 5-year fixed mortgage rate of 1.78% amortized over 25 years would have qualified for a home valued at $651,000 under a 5.25% qualifying rate.

Mortgage stress test changes

As of June 1, 2021, all uninsured mortgages (where borrowers have a down payment of at least 20%) and insured mortgages (below 20% down payment) must be approved at a higher qualifying rate of 5.25% (previously, the qualifying rate was 4.79%). This higher qualifying rate decreases homebuyers’ purchasing power and reduces the amount of mortgage a household can qualify for by about 5 percent (read more here).

OSFI – Canada’s financial regulator – said it will review the minimum qualifying rate on an annual basis.

Compare today's top mortgage rates

Looking for a great mortgage rate? Check out the lowest mortgage rates available

How to stress test your mortgage

So, changes to the mortgage stress test aside, how do you figure out what minimum monthly payment you’re required to be able to afford? Here’s what you need to know.

Increase the current interest rate

It’s one thing to compare the best mortgage rates on our site today, but you should also assume that mortgage rates could go up in the future. If you have a variable-rate mortgage, which is attached to the prime rate, rate increases would immediately affect your mortgage payments. If you have a fixed-rate mortgage, you’ll keep your current low rate for the duration of your term, but could be faced with an increase once your mortgage comes up for renewal.

While it’s impossible to predict exactly where interest rates will be in a few years, an increase of two to three percentage points isn’t out of the question. For example, if you buy a home for $468,350, put down 20%, and qualify for a 5-year fixed-rate mortgage of 2.89%, you’ll have a monthly mortgage payment of $1,752. That doesn’t sound so bad.

But what if mortgage rates increase to 5.34% after your 5-year term ends? According to our mortgage payment calculator, your monthly payment would rise to $2,252. Can you afford that rate today?

If you couldn’t afford those payments, you may need to weigh your options. Do you save a larger down payment and defer the purchase of your home? Do you choose a more affordable home? You’ll have to work that out for yourself, but it’s a good idea to speak with your mortgage broker to help you figure out your best course of action.

Interest Rate Risk

Below our calculator, we built in an Interest Rate Risk section. This shows you what the balance of your mortgage will be after this mortgage term. It then gives you some examples of what your new monthly mortgage payment could be with a variety of different rates, based on historical averages. While you probably don’t need to worry about mortgage rates ever hitting double digits again, it’s still good to be informed.

To run multiple scenarios on our mortgage payment calculator, you can also manually enter custom mortgage rates. Compare these results to your monthly budget before you buy a home that may be too expensive in the future. If you want to get serious about it, keep a spreadsheet with all the results so you can reference it later.

The bottom line

It’s important to keep up to date on changes to Canadian mortgage regulations, as they can directly impact your mortgage. Beyond that, the best thing you can do to increase the amount you can borrow is to earn more money and save more for a down payment.

It also doesn’t hurt to ask a mortgage broker for help when stress testing a mortgage before you buy. In addition to helping you find out what your ideal debt service ratios and maximum interest rate are, they can keep you up to date on changes to lending policies that can affect how much you can borrow.

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