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How the Canadian Mortgage Stress Test Works and How to Pass It

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    Oliver Pelero
    Twitter

Introduction

Buying a home is the largest purchase most Canadians will ever make. When applying for a home loan, you might calculate what you can afford based on current bank interest rates.

However, Canadian banks will not evaluate you on those rates. Instead, they must test you against a higher rate called the Mortgage Stress Test.

Introduced by the Office of the Superintendent of Financial Institutions (OSFI), the stress test ensures that buyers can continue to afford their mortgage payments if interest rates rise in the future.

In this guide, we explain how the stress test works and how it affects your home search. You can run your own numbers with our Mortgage & Stress Test Calculator.

How the Stress Test Rate is Determined

Under the OSFI guidelines, you must prove you can afford payments at a qualifying interest rate which is the higher of:

  1. Your contract interest rate plus 2%.
  2. The benchmark floor rate of 5.25%.

For example, if a bank offers you a mortgage rate of 4.5%, you must prove you have the income to make payments at 6.5% (4.5% + 2%), even though your actual payments will be calculated at 4.5%.

The Debt Service Ratios

To pass the stress test, your monthly housing expenses must fit within two strict industry ratios:

1. Gross Debt Service (GDS) Ratio (Max 39%)

Your total monthly housing costs (mortgage principal, interest, property taxes, heat, and 50% of condo fees) must not exceed 39% of your pre-tax household income.

2. Total Debt Service (TDS) Ratio (Max 44%)

Your total housing costs plus all other personal debt obligations (car loans, student loans, credit card balances) must not exceed 44% of your pre-tax household income.

Actionable Tips to Pass the Stress Test

If the stress test limits your home buying budget, you can improve your position by:

  • Paying Down Non-Housing Debt: Eliminating credit card balances or car loans lowers your TDS ratio, unlocking more housing borrowing room.
  • Increasing Your Down Payment: Lowering the principal loan amount reduces your monthly GDS and TDS costs.
  • Co-signing: Adding a co-signer with stable income increases the household income base.

Conclusion

The mortgage stress test reduces your maximum purchasing power, but it protects you from interest rate volatility.

To test your GDS/TDS ratios and estimate your maximum home purchase price under the stress test rules, try our Mortgage & Stress Test Calculator.

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