The Common Equity Tier 1 (CET1) ratio is a crucial metric used to assess the financial strength and stability of a bank, particularly its ability to withstand financial stress and economic downturns. It measures a bank’s core equity capital compared with its total risk-weighted assets.
Here’s why it’s important and what it tells us about the safety of mortgages for the economy:
- Financial Stability
- Risk Management
- Regulatory Compliance
- Economic Impact
- Consumer Confidence

Financial Stability
The CET1 ratio is a key indicator of a bank’s capital adequacy. Higher ratios suggest that a bank has a strong buffer of capital set aside to absorb potential losses without needing to halt its operations. This is crucial for maintaining stability in the financial system, especially during economic downturns.
Risk Management
By focusing on risk-weighted assets, the CET1 ratio encourages banks to manage their risk exposure more effectively. Mortgages, being significant assets for most banks, have varying risk weights depending on factors like the borrower’s creditworthiness and the loan-to-value ratio. A higher CET1 ratio implies that a bank has robust risk management practices in place, making its mortgage portfolio safer.
Regulatory Compliance
Regulators set minimum CET1 ratio requirements to ensure banks can support their operations and obligations even in adverse conditions. Banks with ratios well above the regulatory minimum are considered more secure and less likely to fail, thus contributing to overall economic stability.
Economic Impact:
For the economy as a whole, a high CET1 ratio among banks suggests a strong and resilient banking sector capable of supporting economic activities, including lending and investment. This is particularly important for the housing market, as banks need to be stable to continue offering mortgage loans, thereby supporting home purchases and construction.
Consumer Confidence:
A robust CET1 ratio boosts consumer and investor confidence in the financial system. Knowing that banks are well-capitalized and prepared for potential losses can encourage continued investment and spending, including in the real estate sector.
What is the Common Equity Tier 1 (CET1) Ratio?
The Common Equity Tier 1 (CET1) ratio is used globally to measure a bank’s financial health and its capacity to withstand financial stress. Here’s a general guideline for categorizing CET1 ratios:
Excellent
CET1 Ratio: Above 12%
Interpretation: A CET1 ratio above 12% is often considered excellent, indicating that the bank has a strong capital base relative to its risk-weighted assets. Banks with ratios in this range are well-equipped to absorb significant losses and are seen as very stable and secure.
Good
CET1 Ratio: 10% to 12%
Interpretation: This range is generally considered good, showing that the bank maintains a solid buffer above the regulatory minimum requirements. Banks in this category are viewed as financially healthy and able to support their operations and obligations even in less favourable economic conditions.
Fair
CET1 Ratio: 7% to 10%
Interpretation: A CET1 ratio in this range is seen as fair. While these banks meet the basic regulatory requirements, their lower capital buffer relative to those in the ‘good’ category makes them more vulnerable to economic downturns. However, they are still considered stable enough to operate under normal conditions.
Poor
CET1 Ratio: Below 7%
Interpretation: A CET1 ratio below 7% is considered poor and suggests that the bank is under-capitalized. This low level of capitalization means higher financial risk, making the bank more susceptible to economic shocks. Such banks may be subject to regulatory scrutiny and might need to implement measures to increase their capital levels.
These thresholds can vary based on the regulatory environment in specific countries and the specific circumstances of individual banks. For instance, during periods of economic uncertainty or following financial crises, regulators may adjust capital requirements to ensure greater resilience in the banking sector. Additionally, banks that are systematically important—those whose failure would significantly impact the financial system—are often required to maintain higher CET1 ratios.
Canadian Bank CET1 Ratios
The latest reported Common Equity Tier 1 (CET1) ratio for the Royal Bank of Canada is 14.9% as of the first quarter of 2024. This ratio indicates a strong capital base relative to the bank’s risk-weighted assets, reflecting robust financial health and stability.
As of the first quarter of 2024, the Bank of Nova Scotia reported a Common Equity Tier 1 (CET1) ratio of 12.9%. This indicates a solid capital base and reflects the bank’s ability to manage its risk-weighted assets effectively. I will now find the latest CET1 ratios for CIBC, Bank of Montreal, and TD Canada Trust.
As of the second quarter of 2024, CIBC reported a Common Equity Tier 1 (CET1) ratio of 13.1%. This reflects a stable financial condition, indicating a good level of capital adequacy compared to its risk-weighted assets.
The Bank of Montreal reported a Common Equity Tier 1 (CET1) ratio of 12.8% for the first quarter of 2024. This ratio indicates solid capital adequacy, reflecting the bank’s capability to absorb potential losses and manage risks effectively.
As of the second quarter of 2024, TD Canada Trust reported a Common Equity Tier 1 (CET1) ratio of 13.4%. This ratio suggests that TD maintains a strong capital base, which contributes to its ability to absorb potential financial losses and stabilize its operations under various economic conditions.
As of the first quarter of 2024, BMO’s residential mortgage portfolio is valued at approximately $150 billion, and its Home Equity Line of Credit (HELOC) portfolio stands at about $48.7 billion.
For CIBC, at the end of the fourth quarter of 2021, their residential mortgage portfolio had risen to $242 billion. The HELOC portfolio for CIBC was reported at $18.8 billion during the same period.
Conclusion
In summary, the CET1 ratio is an essential gauge of a bank’s health and its ability to sustain operations during financial challenges. A strong CET1 ratio indicates a safer environment for mortgages, suggesting that banks are well-equipped to handle loan defaults, which stabilizes the mortgage market and, by extension, the broader economy. Canadian banks are strong, as every Canadian bank has an excellent CET1 ratio.

