Why was it necessary for OSFI to mandate the implementation of the mortgage stress test?
The Office of the Superintendent of Financial Institutions (OSFI) mandated the implementation of the mortgage stress test in Canada for several key reasons, primarily aimed at enhancing the stability and resilience of the Canadian housing market and financial system. The necessity of the stress test can be attributed to the following factors:
Rising Household Debt: Prior to the implementation of the stress test, Canada witnessed a significant increase in household debt levels, particularly mortgage debt. This trend raised concerns about the financial vulnerability of households to economic shocks and interest rate increases.
Overheated Housing Markets: Certain regions in Canada experienced rapid increases in housing prices, leading to fears of a housing bubble. The stress test was introduced as a measure to cool down these overheated markets by ensuring that borrowers were not taking on more debt than they could afford.
Interest Rate Risk: With historically low interest rates, there was a risk that borrowers might struggle with their mortgage payments once rates began to rise. The stress test requires borrowers to qualify at a higher interest rate, ensuring they have the capacity to withstand future rate increases.
Financial System Stability: The stress test is a prudential measure designed to enhance the stability of the financial system. By ensuring that new mortgage borrowers can manage their payments even under less favourable economic conditions, the stress test reduces the risk of widespread defaults and financial instability.
Responsible Lending Practices: The stress test encourages both lenders and borrowers to engage in more responsible lending and borrowing practices. It prompts lenders to conduct more thorough assessments of borrowers’ financial situations and encourages borrowers to consider the long-term affordability of their mortgages.
Consumer Protection: The stress test serves as a consumer protection mechanism, helping to prevent borrowers from overextending themselves and facing financial hardship if economic conditions change.
Aligning with International Standards: The implementation of the stress test aligns Canada with international best practices for mortgage lending and financial regulation, as recommended by bodies such as the Financial Stability Board and the International Monetary Fund.
Affordability Crisis
To prevent a similar crisis in Canada, stress tests (and there have been several) have exacerbated another problem for Canadians: they make housing more unaffordable and inflame Canada’s housing affordability crisis. With each new stress test, the maximum mortgage Canadians can get becomes less at the same time house prices increase, pushing many Canadians out of the housing market. To address this problem, the government changed its policy in 2024, and for the first time,e Canadians can obtain a larger mortgage. However, the maximum mortgage amount has returned to the 2018 levels, which is still grossly out of line with house prices today.

While the mortgage stress test in Canada is a valuable tool for promoting financial stability and responsible lending, it is not a guarantee against a financial crisis. A crisis can result from a complex interplay of various factors, including economic, regulatory, and market dynamics. The stress test is one of several measures needed to maintain a stable and sustainable financial system. Other factors, such as global economic conditions, regulatory oversight, and the behaviour of financial ins
Summary
The mortgage stress test was introduced by OSFI to address multiple concerns related to household debt, housing market stability, interest rate risk, and overall financial system resilience. It represents a proactive approach to safeguarding both individual borrowers and the broader economy from potential financial shocks.