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Capital adequacy ratio is the ratio which determines the bank's capacity to meet the time liabilities and other risks such as credit risk, operational risk etc. In the most simple formulation, a bank's capital is the "cushion" for potential losses, and protects the bank's depositors and other lenders.
Another term commonly used in the context of the frameworks is economic capital, which can be thought of as the capital level bank shareholders would choose in the absence of capital regulation. [3] The capital ratio is the percentage of a bank's capital to its risk-weighted assets. Weights are defined by risk-sensitivity ratios whose ...
Basel III requires banks to have a minimum CET1 ratio (Common Tier 1 capital divided by risk-weighted assets (RWAs)) at all times of: . 4.5%; Plus: A mandatory "capital conservation buffer" or "stress capital buffer requirement", equivalent to at least 2.5% of risk-weighted assets, but could be higher based on results from stress tests, as determined by national regulators.
The Tier 1 capital ratio is the ratio of a bank's core equity capital to its total risk-weighted assets (RWA). Risk-weighted assets are the total of all assets held by the bank weighted by credit risk according to a formula determined by the Regulator (usually the country's central bank).
According to the study, capital regulation based on risk-weighted assets encourages innovation designed to circumvent regulatory requirements and shifts banks' focus away from their core economic functions. Tighter capital requirements based on risk-weighted assets, introduced in the Basel III, may further contribute to these skewed incentives.
Credit unions in this category may fail to meet their risk-based net worth requirements. A capital adequacy rating of 4 is appropriate if the credit union is "significantly undercapitalized" but asset quality, earnings, credit or interest-rate problems will not cause the credit union to become critically undercapitalized in the next 12 months.
The aggregate decline in capital ratios for the banks during a hypothetical downturn was larger than the decline posted by banks in last year’s test, when fewer lenders were examined.
The Basel II accord proposes to permit banks a choice between two broad methodologies for calculating their capital requirements for credit risk. The other alternative is based on internal ratings. Reforms to the standardised approach to credit risk are due to be introduced under the Basel III: Finalising post-crisis reforms.